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Sample records for cardiac sympathetic innervation

  1. Imaging of the autonomic nervous system: focus on cardiac sympathetic innervation.

    Science.gov (United States)

    Goldstein, David S

    2003-12-01

    Symptoms or signs of abnormal autonomic nervous system function occur commonly in several neurological disorders. Clinical evaluations have depended on physiological, pharmacological, and neurochemical approaches. Recently, imaging of sympathetic noradrenergic innervation has been introduced and applied especially in the heart. Most studies have used the radiolabeled sympathomimetic amine, (123)I-metaiodobenzylguanidine. Decreased uptake or increased "washout" of (123)I-metaiodobenzylguanidine-derived radioactivity is associated with worse prognosis or more severe disease in hypertension, congestive heart failure, arrhythmias, and diabetes mellitus. This pattern may reflect a high rate of postganglionic sympathetic nerve traffic to the heart. Many recent studies have agreed on the remarkable finding that all patients with Parkinson's disease and orthostatic hypotension have a loss of cardiac sympathetic innervation, whereas all patients with multiple system atrophy, often difficult to distinguish clinically from Parkinson's disease, have intact cardiac sympathetic innervation. Because Parkinson's disease entails a postganglionic sympathetic noradrenergic lesion, the disease appears to be not only a movement disorder, with dopamine loss in the nigrostriatal system of the brain, but also a dysautonomia, with noradrenaline loss in the sympathetic nervous system of the heart. As new ligands are developed, one may predict further discoveries of involvement of components of the autonomic nervous system in neurological diseases.

  2. Radionuclide imaging of cardiac sympathetic innervation in heart failure: unlocking untapped potential.

    Science.gov (United States)

    Gupta, Shuchita; Amanullah, Aman

    2015-03-01

    Heart failure (HF) is associated with sympathetic overactivity, which contributes to disease progression and arrhythmia development. Cardiac sympathetic innervation imaging can be performed using radiotracers that are taken up in the presynaptic nerve terminal of sympathetic nerves. The commonly used radiotracers are (123)I-metaiodobenzylguanidine ((123)I-mIBG) for planar and single-photon emission computed tomography imaging, and (11)C-hydroxyephedrine for positron emission tomography imaging. Sympathetic innervation imaging has been used in assessing prognosis, response to treatment, risk of ventricular arrhythmias and sudden death and prediction of response to cardiac resynchronization therapy in patients with HF. Other potential applications of these techniques are in patients with chemotherapy-induced cardiomyopathy, predicting myocardial recovery in patients with left ventricular assist devices, and assessing reinnervation following cardiac transplantation. There is a lack of standardization with respect to technique of (123)I-mIBG imaging that needs to be overcome for the imaging modality to gain popularity in clinical practice.

  3. Differential cardiac responses to unilateral sympathetic nerve stimulation in the isolated innervated rabbit heart.

    Science.gov (United States)

    Winter, James; Tanko, Abdul Samed; Brack, Kieran E; Coote, John H; Ng, G André

    2012-01-26

    The heart receives both a left and right sympathetic innervation. Currently there is no description of an in vitro whole heart preparation for comparing the influence of each sympathetic supply on cardiac function. The aim was to establish the viability of using an in vitro model to investigate the effects of left and right sympathetic chain stimulation (LSS/RSS). For this purpose the upper sympathetic chain on each side was isolated and bipolar stimulating electrodes were attached between T2-T3 and electrically insulated from surrounding tissue in a Langendorff innervated rabbit heart preparation (n=8). Heart rate (HR) was investigated during sinus rhythm, whilst dromotropic, inotropic and ventricular electrophysiological effects were measured during constant pacing (250 bpm). All responses exhibited linear increases with increases in stimulation frequency (2-10 Hz). The change in HR was larger during RSS than LSS (P<0.01), increasing by 78±9 bpm and 49±8 bpm respectively (10 Hz, baseline; 145±7 bpm). Left ventricular pressure was increased from a baseline of 50±4 mmHg, by 22±5 mmHg (LSS, 10 Hz) and 4±1 mmHg (RSS, 10 Hz) respectively (P<0.001). LSS, but not RSS, caused a shortening of basal and apical monophasic action potential duration (MAPD90). We demonstrate that RSS exerts a greater effect at the sinoatrial node and LSS at the left ventricle. The study confirms previous experiments on dogs and cats, provides quantitative data on the comparative influence of right and left sympathetic nerves and demonstrates the feasibility of isolating and stimulating the ipsilateral cardiac sympathetic supply in an in vitro innervated rabbit heart preparation.

  4. Impaired cardiac sympathetic innervation in symptomatic patients with long QT syndrome

    Energy Technology Data Exchange (ETDEWEB)

    Kies, Peter; Stegger, Lars; Schober, Otmar [University Hospital Muenster, Department of Nuclear Medicine, Muenster (Germany); Paul, Matthias; Moennig, Gerold [University Hospital Muenster, Department for Cardiology and Angiology, Muenster (Germany); Gerss, Joachim [University of Muenster, Institute of Biostatistics and Clinical Research, Muenster (Germany); Wichter, Thomas [Marienhospital Osnabrueck, Department of Cardiology, Niels-Stensen-Kliniken, Osnabrueck (Germany); Schaefers, Michael [University of Muenster, European Institute of Molecular Imaging - EIMI, Muenster (Germany); Schulze-Bahr, Eric [University Hospital Muenster, Department for Cardiology and Angiology, Muenster (Germany); University Hospital Muenster, Institute for Genetics of Heart Diseases, Muenster (Germany)

    2011-10-15

    Increased sympathetic activation is a key modifier for arrhythmogenesis in patients with long QT syndrome (LQTS), a congenital channelopathy. Therefore, we investigated cardiac sympathetic function using {sup 123}I-metaiodobenzylguanidine (MIBG) single photon emission computed tomography (SPECT) in a cohort of symptomatic LQTS patients and correlated these findings with the underlying genotype. [{sup 123}I]MIBG SPECT was performed in 28 LQTS patients. Among these, 18 patients (64%) had a previous syncope and 10 patients (36%) survived sudden cardiac arrest. Patients were characterized in terms of genetic subtypes and QTc interval on surface ECGs. SPECT images were analysed for regional [{sup 123}I]MIBG uptake in a 33-segment bullseye scheme and compared to those obtained from 10 age-matched healthy control subjects (43 {+-} 12 years). An abnormal {sup 123}I-MIBG scan was found in 17 of 28 LQTS patients (61%) with a tracer reduction mainly located in the anteroseptal segments of the left ventricle. This finding was independent of the genetic LQTS subtype. In addition, no differences were found between LQTS patients with a QTc >500 ms vs <500 ms or those suffering from syncope vs VF (p > 0.05). A distinct regional pattern of impaired cardiac sympathetic function was identified in the majority of symptomatic LQTS patients. This innervation defect was independent of the underlying genotype and clinical disease expression. (orig.)

  5. Scintigraphic assessment of cardiac sympathetic innervation with I-123-metaiodobenzylguanidine in cardiomyopathy. Special reference to cardiac arrhythmia

    Energy Technology Data Exchange (ETDEWEB)

    Asano, Takahisa; Otsuka, Nobuaki; Sone, Teruki; Mimura, Hiroaki; Yanagimoto, Shinichi; Tomomitsu, Tatsushi; Fukunaga, Masao [Kawasaki Medical School, Kurashiki, Okayama (Japan); Morita, Koichi

    1999-07-01

    Cardiac sympathetic imagings with I-123-metaiodobenzylguanidine (MIBG) were carried out in 5 cases with dilated cardiomyopathy (DCM), 26 cases with hypertrophic cardiomyopathy (HCM), and 4 cases without cardiac disease as a control to assess cardiac sympathetic innervation qualitatively and quantitatively, and to clarify the relation of MIBG accumulation to arrhythmia. MIBG scintigraphy was performed at 15 min. (early image) and 4 hr. (delayed image) after intravenous injection of MIBG 111 MBq. The MIBG uptake ratio of mediastinum (H/M) and the cardiac washout rate (WR) from early to delayed images were calculated. On both early and delayed SPECTs, MIBG uptake was assessed by defect scores (DSs). Regarding the cases with HCM, the MIBG uptake ratio, WR, and DS were also compared in cases with and without arrhythmia. In DCM, the MIBG uptake on delayed SPECT was markedly low, the H/M ratio was significantly lower, and the DS was significantly higher than in the control (all p<0.05). As for the WR, there was no significant difference between HCM, DCM and the control. In HCM, significantly reduced MIBG uptake was observed in cases with ventricular techycardia (VT) and in cases with atrial fibrillation (Af), as compared with cases without arrhythmia (all p<0.05). There results suggest that MIBG scintigraphy might be a useful tool in the assessment of cardiac sympathetic abnormalities in cardiomyopathy, especially in cases with arrhythmia. (author)

  6. Prognostic value of sympathetic innervation and cardiac asynchrony in dilated cardiomyopathy

    Energy Technology Data Exchange (ETDEWEB)

    Manrique, Alain; Hitzel, Anne; Vera, Pierre [Rouen University Hospital - Henri Becquerel Center, Nuclear Medicine, Rouen (France); Bernard, Mathieu; Bauer, Fabrice [Rouen University Hospital, Cardiology, Rouen (France); Menard, Jean-Francois [Rouen University Hospital, Biostatistics, Rouen (France); Sabatier, Remi [Caen University Hospital, Cardiology, Caen (France); Jacobson, Arnold [GE Healthcare, Princeton, NJ (United States); Agostini, Denis [Caen University Hospital, Nuclear Medicine, Caen (France)

    2008-11-15

    The purpose of the study is to examine prognostic values of cardiac I-123 metaiodobenzylguanidine (MIBG) uptake and cardiac dyssynchrony in patients with dilated cardiomyopathy (DCM). Ninety-four patients with non-ischemic DCM underwent I-123 MIBG imaging for assessing cardiac sympathetic innervation and equilibrium radionuclide angiography. Mean phase angles and SD of the phase histogram were computed for both right ventricular (RV) and left ventricular (LV). Phase measures of interventricular (RV-LV) and intraventricular (SD-RV and SD-LV) asynchrony were computed. Most patients were receiving beta-blockers (89%) and angiotensin-converting enzyme inhibitors (88%). One patient (1%) was lost to follow-up, six had cardiac death (6.4%), eight had heart transplantation (8.6%), and seven had unplanned hospitalization for heart failure (7.5%; mean follow-up: 37 {+-} 16 months). Patients with poor clinical outcome were older, had higher The New York Heart Association functional class, impaired right ventricular ejection fraction and left ventricular ejection fraction, and impaired cardiac I-123 MIBG uptake. On multivariate analysis, I-123 MIBG heart-to-mediastinum (H/M) uptake ratio <1.6 was the only predictor of both primary (cardiac death or heart transplantation, RR = 7.02, p < 0.01) and secondary (cardiac death, heart transplantation, or recurrent heart failure, RR = 8.10, p = 0.0008) end points. In patients receiving modern medical therapy involving beta-blockers, I-123 MIBG uptake, but not intra-LV asynchrony, was predictive of clinical outcome. The impact of beta-blockers on the prognostic value of ventricular asynchrony remains to be clarified. (orig.)

  7. Assessment of cardiac sympathetic nerve integrity with positron emission tomography

    Energy Technology Data Exchange (ETDEWEB)

    Raffel, David M. E-mail: raffel@umich.edu; Wieland, Donald M

    2001-07-01

    The autonomic nervous system plays a critical role in the regulation of cardiac function. Abnormalities of cardiac innervation have been implicated in the pathophysiology of many heart diseases, including sudden cardiac death and congestive heart failure. In an effort to provide clinicians with the ability to regionally map cardiac innervation, several radiotracers for imaging cardiac sympathetic neurons have been developed. This paper reviews the development of neuronal imaging agents and discusses their emerging role in the noninvasive assessment of cardiac sympathetic innervation.

  8. Autonomic cardiac innervation

    OpenAIRE

    Hasan, Wohaib

    2013-01-01

    Autonomic cardiac neurons have a common origin in the neural crest but undergo distinct developmental differentiation as they mature toward their adult phenotype. Progenitor cells respond to repulsive cues during migration, followed by differentiation cues from paracrine sources that promote neurochemistry and differentiation. When autonomic axons start to innervate cardiac tissue, neurotrophic factors from vascular tissue are essential for maintenance of neurons before they reach their targe...

  9. Impact of aging on cardiac sympathetic innervation measured by {sup 123}I-mIBG imaging in patients with systolic heart failure

    Energy Technology Data Exchange (ETDEWEB)

    Rengo, Giuseppe; Ferrara, Nicola [Scientific Institute of Telese Terme, Salvatore Maugeri Foundation, IRCCS, Telese Terme (Italy); University of Naples Federico II, Division of Geriatrics, Department of Translational Medical Sciences, Naples (Italy); Pagano, Gennaro; Formisano, Roberto; Komici, Klara; Petraglia, Laura; Parisi, Valentina; Femminella, Grazia Daniela; De Lucia, Claudio; Cannavo, Alessandro; Memmi, Alessia; Leosco, Dario [University of Naples Federico II, Division of Geriatrics, Department of Translational Medical Sciences, Naples (Italy); Vitale, Dino Franco [Scientific Institute of Telese Terme, Salvatore Maugeri Foundation, IRCCS, Telese Terme (Italy); Paolillo, Stefania [Institute of Diagnostic and Nuclear Development, SDN Foundation, Naples (Italy); Attena, Emilio [Fatebenefratelli Hospital, Department of Cardiology, Naples (Italy); Pellegrino, Teresa [Institute of Biostructures and Bioimages of the National Council of Research, Naples (Italy); Federico II University of Naples, Division of Imaging, Radiotherapy, Neuroradiology, and Medical Physics, Department of Advanced Biomedical Sciences, Naples (Italy); Dellegrottaglie, Santo [Ospedale Medico-Chirurgico Accreditato Villa dei Fiori, Division of Cardiology, Acerra, Naples (Italy); Trimarco, Bruno; Filardi, Pasquale Perrone [Federico II University of Naples, Division of Cardiology, Department of Advanced Biomedical Sciences, Naples (Italy); Cuocolo, Alberto [Institute of Diagnostic and Nuclear Development, SDN Foundation, Naples (Italy); Federico II University of Naples, Division of Imaging, Radiotherapy, Neuroradiology, and Medical Physics, Department of Advanced Biomedical Sciences, Naples (Italy)

    2016-12-15

    Sympathetic nervous system (SNS) hyperactivity is a salient characteristic of chronic heart failure (HF) and contributes to the progression of the disease. Iodine-123 meta-iodobenzylguanidine ({sup 123}I-mIBG) imaging has been successfully used to assess cardiac SNS activity in HF patients and to predict prognosis. Importantly, SNS hyperactivity characterizes also physiological ageing, and there is conflicting evidence on cardiac {sup 123}I-mIBG uptake in healthy elderly subjects compared to adults. However, little data are available on the impact of ageing on cardiac sympathetic nerve activity assessed by {sup 123}I-mIBG scintigraphy, in patients with HF. We studied 180 HF patients (age = 66.1 ± 10.5 years [yrs]), left ventricular ejection fraction (LVEF = 30.6 ± 6.3 %) undergoing cardiac {sup 123}I-mIBG imaging. Early and late heart to mediastinum (H/M) ratios and washout rate were calculated in all patients. Demographic, clinical, and echocardiographic data were also collected. Our study population consisted of 53 patients aged >75 years (age = 77.7 ± 4.0 year), 67 patients aged 62-72 years (age = 67.9 ± 3.2 years) and 60 patients aged ≤61 year (age = 53.9 ± 5.6 years). In elderly patients, both early and late H/M ratios were significantly lower compared to younger patients (p < 0.05). By multivariate analysis, H/M ratios (both early and late) and washout rate were significantly correlated with LVEF and age. Our data indicate that, in a population of HF patients, there is an independent age-related effect on cardiac SNS innervation assessed by {sup 123}I-mIBG imaging. This finding suggests that cardiac {sup 123}I-mIBG uptake in patients with HF might be affected by patient age. (orig.)

  10. Regional heterogeneity in cardiac sympathetic innervation in acute myocardial infarction: relationship with myocardial oedema on magnetic resonance

    Energy Technology Data Exchange (ETDEWEB)

    Gimelli, Alessia; Masci, Pier Giorgio; Pasanisi, Emilio Maria; Lombardi, Massimo [Fondazione CNR/Regione Toscana, Pisa (Italy); Liga, Riccardo; Grigoratos, Chrysanthos [University Hospital of Pisa, Pisa (Italy); Marzullo, Paolo [Fondazione CNR/Regione Toscana, Pisa (Italy); Institute of Clinical Physiology, CNR, Pisa (Italy)

    2014-09-15

    To assess the relationships between myocardial structure and function on cardiac magnetic resonance (CMR) imaging and sympathetic tone on {sup 123}I-metaiodobenzylguanidine ({sup 123}I-MIBG) scintigraphy early after myocardial infarction (MI). Ten patients underwent {sup 123}I-MIBG and {sup 99m}Tc-tetrofosmin rest cadmium zinc telluride scintigraphy 4 ± 1 days after MI. The segmental left ventricular (LV) relative radiotracer uptake of both {sup 99m}Tc-tetrofosmin and early {sup 123}I-MIBG was calculated. The day after scintigraphy, on CMR imaging, the extent of ischaemia-related oedema and of myocardial fibrosis (late gadolinium enhancement, LGE) was assessed. Accordingly, the extent of oedema and LGE was evaluated for each segment and segmental wall thickening determined. Based on LGE distribution, LV segments were categorized as ''infarcted'' (56 segments), ''adjacent'' (66 segments) or ''remote'' (48 segments). Infarcted segments showed a more depressed systolic wall thickening and greater extent of oedema than adjacent segments (p < 0.001) and remote segments (p < 0.001). Interestingly, while uptake of {sup 99m}Tc-tetrofosmin was significantly depressed only in infarcted segments (p < 0.001 vs. both adjacent and remote segments), uptake of {sup 123}I-MIBG was impaired not only in infarcted segments (p < 0.001 vs. remote) but also in adjacent segments (p = 0.024 vs. remote segments). At the regional level, after correction for {sup 99m}Tc-tetrofosmin and LGE distribution, segmental {sup 123}I-MIBG uptake (p < 0.001) remained an independent predictor of ischaemia-related oedema. After acute MI the regional impairment of sympathetic tone extends beyond the area of altered myocardial perfusion and is associated with myocardial oedema. (orig.)

  11. Is it time for cardiac innervation imaging?

    Energy Technology Data Exchange (ETDEWEB)

    Knuuti, J. [Turku Univ., Turku (Finland) Turku PET Center; Sipola, P. [Kuopio Univ., Kuopio (Finland)

    2005-03-01

    The autonomic nervous system plays an important role in the regulation of cardiac function and the regional distribution of cardiac nerve terminals can be visualized using scintigraphic techniques. The most commonly used tracer is iodine-123-metaiodobenzylguanidine (MIBG) but C-11-hydroxyephedrine has also been used with PET. When imaging with MIBG, the ratio of heart-to-mediastinal counts is used as an index of tracer uptake, and regional distribution is also assessed from tomographic images. The rate of clearance of the tracer can also be measured and indicates the function of the adrenergic system. Innervation imaging has been applied in patients with susceptibility to arrythmias, coronary artery disease, hypertrophic and dilated cardiomyopathy and anthracycline induced cardiotoxicity. Abnormal adrenergic innervation or function appear to exist in many pathophysiological conditions indicating that sympathetic neurons are very susceptible to damage. Abnormal findings in innervation imaging also appear to have significant prognostic value especially in patients with cardiomyopathy. Recently, it has also been shown that innervation imaging can monitor drug-induced changes in cardiac adrenergic activity. Although innervation imaging holds great promise for clinical use, the method has not received wider clinical acceptance. Larger randomized studies are required to confirm the value of innervation imaging in various specific indications.

  12. Remodelling sympathetic innervation in rat pancreatic islets ontogeny

    Directory of Open Access Journals (Sweden)

    Hiriart Marcia

    2009-06-01

    Full Text Available Abstract Background Pancreatic islets are not fully developed at birth and it is not clear how they are vascularised and innervated. Nerve Growth Factor (NGF is required to guide sympathetic neurons that innervate peripheral organs and also in cardiovascular system and ovary angiogenesis. Pancreatic beta cells of a transgenic mouse that over-expressed NGF in attracts sympathetic hyper-innervation towards them. Moreover, we have previously demonstrated that adult beta cells synthesize and secrete NGF; however, we do not know how is NGF secreted during development, nor if it might be trophic for sympathetic innervation and survival in the pancreas. We analyzed sympathetic innervation and vasculature development in rat pancreatic islets at different developmental stages; foetal (F19, early postnatal (P1, weaning period (P20 and adults. We temporarily correlated these events to NGF secretion by islet cells. Results Sympathetic fibres reached pancreatic islets in the early postnatal period, apparently following blood vessels. The maximal number of sympathetic fibres (TH immunopositive in the periphery of the islets was observed at P20, and then fibres entered the islets and reached the core where beta cells are mainly located. The number of fibres decreased from that stage to adulthood. At all stages studied, islet cells secreted NGF and also expressed the high affinity receptor TrkA. Foetal and neonatal isolated islet cells secreted more NGF than adults. TrkA receptors were expressed at all stages in pancreatic sympathetic fibres and blood vessels. These last structures were NGF–immunoreactive only at early stages (foetal and P0. Conclusion The results suggest that NGF signalling play an important role in the guidance of blood vessels and sympathetic fibres toward the islets during foetal and neonatal stages and could also preserve innervation at later stages of life.

  13. Cardiac fibroblasts regulate sympathetic nerve sprouting and neurocardiac synapse stability.

    Directory of Open Access Journals (Sweden)

    Céline Mias

    Full Text Available Sympathetic nervous system (SNS plays a key role in cardiac homeostasis and its deregulations always associate with bad clinical outcomes. To date, little is known about molecular mechanisms regulating cardiac sympathetic innervation. The aim of the study was to determine the role of fibroblasts in heart sympathetic innervation. RT-qPCR and western-blots analysis performed in cardiomyocytes and fibroblasts isolated from healthy adult rat hearts revealed that Pro-Nerve growth factor (NGF and pro-differentiating mature NGF were the most abundant neurotrophins expressed in cardiac fibroblasts while barely detectable in cardiomyocytes. When cultured with cardiac fibroblasts or fibroblast-conditioned medium, PC12 cells differentiated into/sympathetic-like neurons expressing axonal marker Tau-1 at neurites in contact with cardiomyocytes. This was prevented by anti-NGF blocking antibodies suggesting a paracrine action of NGF secreted by fibroblasts. When co-cultured with cardiomyocytes to mimic neurocardiac synapse, differentiated PC12 cells exhibited enhanced norepinephrine secretion as quantified by HPLC compared to PC12 cultured alone while co-culture with fibroblasts had no effect. However, when supplemented to PC12-cardiomyocytes co-culture, fibroblasts allowed long-term survival of the neurocardiac synapse. Activated fibroblasts (myofibroblasts isolated from myocardial infarction rat hearts exhibited significantly higher mature NGF expression than normal fibroblasts and also promoted PC12 cells differentiation. Within the ischemic area lacking cardiomyocytes and neurocardiac synapses, tyrosine hydroxylase immunoreactivity was increased and associated with local anarchical and immature sympathetic hyperinnervation but tissue norepinephrine content was similar to that of normal cardiac tissue, suggesting depressed sympathetic function. Collectively, these findings demonstrate for the first time that fibroblasts are essential for the setting of

  14. Effect of postnatal lead exposure on the development of sympathetic innervation of the heart. [Rats

    Energy Technology Data Exchange (ETDEWEB)

    Abreu, M.E.

    1983-01-01

    To determine possible mechanisms for this Pb-induced cardiotoxicity, several neutrochemical parameters indicative of cardiac sympathetic innervation were measured in developing rats. Presynaptic indices of nerve terminal development which were studied included steady-state levels of norepinephrine, neuronal uptake and vesicular storage of /sup 3/H-norepinephrine. Analysis of postsynaptic development was accomplished by quantitating the density of ..beta..-adrenergic receptors and by measuring the activity of adenylate cyclase. Rat pups were exposed to Pb from birth to weaning (21 days) via the milk of dams whose drinking water contained 0.2% Pb acetate. This method and level of Pb treatment had no effect on body or heart weight development, however, it did result in a seven-fold increase in the blood Pb content (70-75 ..mu..g/dl) of the treated pups during the period of exposure. Pb exposure accelerated the development of sympathetic innervation of the heart as detected by significant increases in the vesicular uptake of /sup 3/H-norepinephrine and the steady-state concentration of norepinephrine measured at postnatal day 4. On the other hand, ontogeny of the neutronal uptake of /sup 3/H-norepinephrine in the heart and in the forebrain was not affected by Pb treatment. The apparent premature development of sympathetic innervation induced by Pb treatment was not reflected in significant alterations in either the density or the affinity of ..beta..-adrenergic receptor sites determined by the binding kinetics of /sup 3/H-dihydroalprenolol.

  15. Egr3 dependent sympathetic target tissue innervation in the absence of neuron death.

    Directory of Open Access Journals (Sweden)

    Lin Li

    Full Text Available Nerve Growth Factor (NGF is a target tissue derived neurotrophin required for normal sympathetic neuron survival and target tissue innervation. NGF signaling regulates gene expression in sympathetic neurons, which in turn mediates critical aspects of neuron survival, axon extension and terminal axon branching during sympathetic nervous system (SNS development. Egr3 is a transcription factor regulated by NGF signaling in sympathetic neurons that is essential for normal SNS development. Germline Egr3-deficient mice have physiologic dysautonomia characterized by apoptotic sympathetic neuron death and abnormal innervation to many target tissues. The extent to which sympathetic innervation abnormalities in the absence of Egr3 is caused by altered innervation or by neuron death during development is unknown. Using Bax-deficient mice to abrogate apoptotic sympathetic neuron death in vivo, we show that Egr3 has an essential role in target tissue innervation in the absence of neuron death. Sympathetic target tissue innervation is abnormal in many target tissues in the absence of neuron death, and like NGF, Egr3 also appears to effect target tissue innervation heterogeneously. In some tissues, such as heart, spleen, bowel, kidney, pineal gland and the eye, Egr3 is essential for normal innervation, whereas in other tissues such as lung, stomach, pancreas and liver, Egr3 appears to have little role in innervation. Moreover, in salivary glands and heart, two tissues where Egr3 has an essential role in sympathetic innervation, NGF and NT-3 are expressed normally in the absence of Egr3 indicating that abnormal target tissue innervation is not due to deregulation of these neurotrophins in target tissues. Taken together, these results clearly demonstrate a role for Egr3 in mediating sympathetic target tissue innervation that is independent of neuron survival or neurotrophin deregulation.

  16. Subacute cardiac sympathetic dys-innervation, evaluated by the tomo-scintigraphy with {sup 123}I-Mibg in the Takotsubo syndrome: about one case; Dysinnervation sympathique cardiaque subaigue, evaluee par la tomoscintigraphie a l'123I-MIBG dans le syndrome de Takotsubo: a propos d'un cas

    Energy Technology Data Exchange (ETDEWEB)

    Costo, S.; Agostini, D. [Service de medecine nucleaire, CHU Cote-de-Nacre, Caen, (France); Sabatier, R. [service de cardiologie, CHU Cote-de-Nacre, Caen, (France)

    2009-05-15

    The association of perfusion imaging and myocardium innervation showed a major mismatch of fixation attesting of a sympathetic default of innervation contemporary of a left ventricle dysfunction without perfusion troubles, for a patient with a Takotsubo cardiomyopathy. (N.C.)

  17. The effect of the transplanted pineal gland on the sympathetic innervation of the rat sublingual gland.

    Science.gov (United States)

    Chanthaphavong, R S; Murphy, S M; Anderson, C R

    2004-08-01

    We investigated the effect of the pineal on sympathetic neurons that normally innervate the sublingual gland of the rat. When the pineal gland was transplanted into the sublingual gland, it remained as a distinct mass that was innervated by sympathetic axons. Injection of the retrograde tracer, Fast Blue, into the sublingual gland labelled sympathetic neurons in the ipsilateral superior cervical ganglion (SCG). Thirty per cent of all neurons labelled retrogradely by Fast Blue injection into transplanted pineal glands were immunoreactive for both neuropeptide Y (NPY) and calbindin. This combination is characteristic of sympathetic neurons innervating the pineal gland in its normal location, but not the sympathetic vasoconstrictor neurons normally innervating the sublingual gland. This, and our previous study in which the pineal gland was shown to similarly influence the phenotype of salivary secretomotor neurons, suggests that a range of different functional classes of sympathetic neuron are able to change their phenotype in response to signals released by the pineal gland.

  18. Sensory and sympathetic innervation of cervical facet joint in rats

    Institute of Scientific and Technical Information of China (English)

    ZHOU Hai-yu; CHEN An-min; GUO Feng-jing; LIAO Guang-jun; XIAO Wei-dong

    2006-01-01

    Objective: To explore the patterns of innervation of cervical facet joints and determine the pathways from facet joints to dorsal root ganglions (DRGs) in order to clarify the causes of diffuse neck pain, headache, and shoulder pain.Methods: Forty-two male Sprague-Dawley rats,weighing 250-300 g, were randomly divided into three groups: Group A ( n = 18), Group B ( n = 18), and Group C (n = 6 ). Under anesthesia with intraperitoneal pentobarbital sodium (45 mg/kg body weight), a midline dorsal longitudinal incision was made over the cervical spine to expose the left cervical facet joint capsule of all the rats under a microscope. The rats in Group A underwent sympathectomy, but the rats in Group B and Group C did not undergo sympathectomy. Then 0.6 μl 5 % bisbenzimide (Bb) were injected into the C1-2, C3-4 and C5-6 facet joints of 6 rats respectively in Group A and Group B. The holes were immediately sealed with mineral wax to prevent leakage of Bb and the fascia and skin were closed. But in Group C, 0.9% normal saline was injected into the corresponding joint capsules. Then under deep reanesthesia with intraperitoneal pentobarbital sodium (45 mg/kg body weight), C1-C8 left DRGs in all rats and the sympathetic ganglions in Group B were obtained and the number of the labeled neurons was determined.Results: Neurons labeled with Bb were present in C1-C8 DRGs in both Group A and Group B, and sympathetic ganglions in Group B. In the C1-2 and C3-4 subgroups,labeled neurons were present from C1 to C8 DRGs, while in C5-6 subgroups they were from C, to C8. The number of Bb ( + ) neurons after sympathectomy was not significantly different in the injected level from that without sympathectomy. But in the other levels, the number of Bb ( + ) neurons after sympathectomy was significantly less than that without sympathectomy.Conclusions: The innervation of the cervical facet joints is derived from both sensory and sympathetic nervous system, and DRGs are associated with

  19. Sympathetic Innervation Induced in Engrafted Engineered Cardiomyocyte Sheets by Glial Cell Line Derived Neurotrophic Factor In Vivo

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    Xian-ming Fu

    2013-01-01

    Full Text Available The aim of myocardial tissue engineering is to repair or regenerate damaged myocardium with engineered cardiac tissue. However, this strategy has been hampered by lack of functional integration of grafts with native myocardium. Autonomic innervation may be crucial for grafts to function properly with host myocardium. In this study, we explored the feasibility of in vivo induction of autonomic innervation to engineered myocardial tissue using genetic modulation by adenovirus encoding glial cell line derived neurotrophic factor (GDNF. GFP-transgene (control group or GDNF overexpressing (GDNF group engineered cardiomyocyte sheets were transplanted on cryoinjured hearts in rats. Nerve fibers in the grafts were examined by immunohistochemistry at 1, 2, and 4 weeks postoperatively. Growth associated protein-43 positive growing nerves and tyrosine hydroxylase positive sympathetic nerves were first detected in the grafts at 2 weeks postoperatively in control group and 1 week in GDNF group. The densities of growing nerve and sympathetic nerve in grafts were significantly increased in GDNF group. No choline acetyltransferase immunopositive parasympathetic nerves were observed in grafts. In conclusion, sympathetic innervation could be effectively induced into engrafted engineered cardiomyocyte sheets using GDNF.

  20. Macrophage populations and cardiac sympathetic denervation during L-NAME-induced hypertension in rats

    DEFF Research Database (Denmark)

    Neves, S R S; Machado, C R S; Pinto, A M T;

    2006-01-01

    The rat model of hypertension induced by prolonged treatment with Nomega-nitro-L-arginine methyl ester (L-NAME) has been extensively used. However, the effects on cardiac autonomic innervation are unknown. Here, the cardiac sympathetic innervation is analyzed in parallel with myocardial lesions...... and macrophage infiltration at day 7. No denervation was detectable at day 14 of double treatment, using subcutaneous AG. Our findings favor a role for ED1+ macrophages and iNOS in the hypertension-induced denervation process....

  1. Localization of sympathetic postganglionic neurons innervating mesenteric artery and vein in rats.

    Science.gov (United States)

    Hsieh, N K; Liu, J C; Chen, H I

    2000-04-12

    Physiological and histochemical studies have demonstrated the control and innervation of sympathetic nerves to the artery and vein vessels of splanchnic circulation. In our laboratory, we first used the technique of retrograde transport of horseradish peroxidase to identify the origin of sympathetic neurons innervating the mesenteric vein. In this study, double fluorescence staining technique was used for a simultaneous localization of the sympathetic postganglionic neurons supplying the mesenteric artery and vein in rats. First-order branches of mesenteric artery (A) and vein (V) in the vicinity of ileo-cecal junction were isolated for application of fluorescent dyes (Fast Blue, FB and Diamidino Yellow, DY). The application of FB and DY on A and V was alternated in the next animal to minimize the difference in dye uptake. The animal was allowed to recover for 6-7 days assuring a complete uptake of FB and DY into the cytoplasm and nucleus, respectively. The number of FB, DY and double staining neurons in the prevertebral and paravertebral ganglia were counted under a fluorescent microscope after animal fixation and serial frozen section (30 microm) of the sympathetic ganglia. Our study revealed the following findings: (1) Distribution of the fluorescence-staining neurons in the sympathetic ganglia was as follows: right celiac ganglion (39%), superior mesenteric ganglion (30%), left celiac ganglion (26%), inferior mesenteric ganglion (1%) and paravertebral ganglia (4%). (2) Double staining neurons that dually innervate A and V amounted to 54% of total staining neurons. There were 41% neurons singly innervating A and 5% innervating V. (3) The ratio of neurons supplying the A and V ranged from 1.41 to 1.75 (average 1.61). (4) There was no distinct topographical distribution with respect to the neuron location innervating A and V. The distribution of neurons appeared in a scattering pattern.

  2. Acute and chronic estrogen supplementation decreases uterine sympathetic innervation in ovariectomized adult virgin rats.

    Science.gov (United States)

    Zoubina, E V; Mize, A L; Alper, R H; Smith, P G

    2001-10-01

    Uterine innervation undergoes substantial reorganization associated with changes in reproductive status. Nerves innervating the uterus are decreased in pregnancy and puberty, and even the normal rodent estrous cycle is characterized by fluctuations in numbers of myometrial nerve fibers. During the follicular (proestrus/estrous) phase of the estrous cycle, intact nerves are rapidly depleted and then return over the next 2-3 days in the luteal (metestrus/diestrus) phase. We hypothesize that uterine nerve depletion is initiated by increased circulating estrogen in the follicular phase. However, studies have not shown whether estrogen can reduce uterine innervation and, if so, whether the time course is compatible with the rapid changes observed in the estrous cycle. These questions were addressed in the present study. Mature ovariectomized virgin rats received 17-beta-estradiol as a single injection (10 microg/kg s.c.) or chronically from timed-release pellets (0.1 microg/pellet for 3 weeks sustained release). Total (protein gene-product 9.5-immunoreactive) and sympathetic (dopamine beta-hydroxylase-immunoreactive) uterine innervation was assessed quantitatively. Both total and sympathetic innervation was abundant in uterine longitudinal smooth muscle of ovariectomized rats. However, following acute or chronic estrogen administration, total and sympathetic fiber numbers were markedly decreased. This was not due to altered uterine size, as reductions persisted after correcting for size differences. Our results indicate that sympathetic nerves are lost from uterine smooth muscle after estradiol treatment in a manner similar to that seen in the intact animal during estrus and pregnancy. This suggests that the rise in estradiol prior to estrus is sufficient to deplete uterine sympathetic innervation.

  3. Norepinephrine-induced nerve growth factor depletion causes cardiac sympathetic denervation in severe heart failure.

    Science.gov (United States)

    Kimura, Kensuke; Kanazawa, Hideaki; Ieda, Masaki; Kawaguchi-Manabe, Haruko; Miyake, Yoshiko; Yagi, Takashi; Arai, Takahide; Sano, Motoaki; Fukuda, Keiichi

    2010-08-25

    In severe congestive heart failure (CHF), sympathetic overactivity correlates with the exacerbation of cardiac performance. To test the hypothesis that the cardiac sympathetic nerve density dramatically changes with the acceleration of circulating norepinephrine (NE) concentration, we investigated the temporal association of nerve growth factor (NGF) expression in the heart and cardiac sympathetic nerve density during the development of CHF in the continuous NE-infused rats. The animals were analyzed at 0-, 1-, 3-, 7-, 14-, and 28-day after implantation of osmotic pump at a rate of 0.05 mg/kg/hr. The cardiac performance was temporally facilitated in NE-exposed rats at 3-day in accordance with the sympathetic hyper-innervation induced by the augmentation of NGF mRNA expression in the heart. In NE-treated rats, left ventricular end-diastolic pressure was significantly increased after 7-day and marked left ventricular hypertrophy and systemic fluid retention were observed at 28-day. CHF-induced sympathetic overactivity further increased plasma NE concentration in NE-treated rats and finally reached to 16.1+/-5.6 ng/ml at 28-day (control level was 0.39+/-0.1 ng/ml, pcardiac performance. The cardiac sympathetic fiber loss was also confirmed in NE-exposed DBH (dopamine beta-hydroxylase)-Cre/Floxed-EGFP (enhanced green fluorescent protein) mice with severe CHF, in which sympathetic nerve could be traced by EGFP. Our results suggest that the cardiac sympathetic nerve density is strictly regulated by the NGF expression in the heart and long-exposure of high plasma NE concentration caused myocardial NGF reduction, following sympathetic fiber loss in severe CHF animals.

  4. Relationships between cardiac innervation/perfusion imbalance and ventricular arrhythmias: impact on invasive electrophysiological parameters and ablation procedures

    Energy Technology Data Exchange (ETDEWEB)

    Gimelli, Alessia [Fondazione Toscana Gabriele Monasterio, Pisa (Italy); Menichetti, Francesca; Soldati, Ezio; Liga, Riccardo; Vannozzi, Andrea; Bongiorni, Maria Grazia [University Hospital of Pisa, Cardio-Thoracic and Vascular Department, Pisa (Italy); Marzullo, Paolo [Fondazione Toscana Gabriele Monasterio, Pisa (Italy); CNR, Institute of Clinical Physiology, Pisa (Italy)

    2016-12-15

    To assess the relationship between regional myocardial perfusion and sympathetic innervation parameters at myocardial scintigraphy and intra-cavitary electrophysiological data in patients with ventricular arrhythmias (VA) submitted to invasive electrophysiological study and ablation procedure. Sixteen subjects underwent invasive electrophysiological study with electroanatomical mapping (EAM) followed by trans-catheter ablations of VA. Before ablation all patients were studied with a combined evaluation of regional myocardial perfusion and sympathetic innervation by means of tomographic {sup 99m}Tc-tetrofosmin and {sup 123}I- metaiodobenzylguanidine cadmium-zinc-telluride (CZT) scintigraphies, respectively. Off-line spatial co-registration of CZT perfusion and innervation data with the three-dimensional EAM reconstruction was performed in every patient. CZT revealed the presence of myocardial scar in 55 (20 %) segments. Of the viable myocardial segments, 131 (60 %) presented a preserved adrenergic innervation, while 86 (40 %) showed a significantly depressed innervation (i.e. innervation/perfusion mismatch). On EAM, the invasively measured intra-cavitary voltage was significantly lower in scarred segments than in viable ones (1.7 ± 1.5 mV vs. 4.0 ± 2.2 mV, P < 0.001). Interestingly, among the viable segments, those showing an innervation/perfusion mismatch presented a significantly lower intra-cavitary voltage than those with preserved innervation (1.9 ± 2.5 mV vs. 4.7 ± 2.3 mV, P < 0.001). Intra-cardiac ablation was performed in 63 (23 %) segments. On multivariate analysis, after correction for scar burden, the segments showing an innervation/perfusion mismatch remained the most frequent ablation targets (OR 5.6, 95 % CI 1.5-20.8; P = 0.009). In patients with VA, intra-cavitary electrical abnormalities frequently originate at the level of viable myocardial segments with depressed sympathetic innervation that frequently represents the ultimate ablation target

  5. PM2.5对大鼠心脏交感神经分布的影响及其与心肌神经生长因子表达的关系%Effect of PM2.5 on sympathetic innervation by stimulating the secretion of cardiac nerve growth factor in healthy rat hearts

    Institute of Scientific and Technical Information of China (English)

    段军; 丛鲁红; 李刚; 易丽; 柯元南; 周益锋

    2012-01-01

    Objective To assess the effect of PM2.5 on sympathetic innervation and the relationship with cardiac nerve growth factor in healthy rat hearts,identify the ability to the sympathetic nerve reconstruction,and explore the possible arrhythogenic mechanism of PM2.5.Methods Forty healthy SD rats were instilled into trachea with two different solutions twice per week for four weeks:control group with saline and experimental group with PM2.5 25 mg/kg.Then these rats were killed,and biatrial appendages,two ventricular anterior walls were left.Immune cytochemical staining of cardiac nerves was performed using anti-tyrosine hydroxylase antibodies and cardiac nerve growth factor was detected by western blotting.Resuits Compared with the control group,both the density of sympathetic nerves and the expression of cardiac NGF protein in the experimental group were much higher in the left ventricular anterior wall ( P<0.01 and P<0.05) and in the right ventricular anterior wall ( P<0.01 and P<0.05).Conclusions PM2.5 can induce regional sympathetic hyperinnervation in both ventricular anterior walls in healthy rats by stimulating the NGF protein secretion,and the sympathetic nerve reconstruction effect of PM2.5 was confirmed.%目的 研究可吸入颗粒物PM2.5对大鼠心脏交感神经分布的影响及其与心肌神经生长因子表达的关系,明确PM2.5是否具有致交感神经重构作用,探讨PM2.5致心律失常的可能机制.方法 40只SD雄性大鼠,随机分为对照组和实验组,每组20只.实验组大鼠按25 mg/kg剂量经气管内缓慢注入颗粒物悬液染毒,每周染毒2次,连续染毒4周;对照组以生理盐水代替颗粒物悬液;两组大鼠于末次染毒后次日处死,开胸留取双侧心耳和双心室前壁,通过免疫组化方法检测酪氨酸羟化酶染色阳性的交感神经纤维分布密度,同时采用蛋白免疫印迹法检测心肌神经生长因子(NGF)蛋白表达.结果 与对照组比较,实验组大鼠吸入PM2

  6. Intracerebroventricular Administration of Neuropeptide Y Induces Hepatic Insulin Resistance via Sympathetic Innervation

    OpenAIRE

    Anita M van den Hoek; Van Heijningen, Caroline; Schröder-van der Elst, Janny P.; Ouwens, D. Margriet; Havekes, Louis M.; Johannes A Romijn; Kalsbeek, Andries; Pijl, Hanno

    2008-01-01

    OBJECTIVE—We recently showed that intracerebroventricular infusion of neuropeptide Y (NPY) hampers inhibition of endogenous glucose production (EGP) by insulin in mice. The downstream mechanisms responsible for these effects of NPY remain to be elucidated. Therefore, the aim of this study was to establish whether intracerebroventricular NPY administration modulates the suppressive action of insulin on EGP via hepatic sympathetic or parasympathetic innervation. RESEARCH DESIGN AND METHODS—The ...

  7. Sympathetic innervation of the spleen in male Brown Norway rats: a longitudinal aging study.

    Science.gov (United States)

    Perez, Sam D; Silva, Dorian; Millar, Ashley Brooke; Molinaro, Christine A; Carter, Jeff; Bassett, Katie; Lorton, Dianne; Garcia, Paola; Tan, Laren; Gross, Jonathon; Lubahn, Cheri; Thyagarajan, Srinivasan; Bellinger, Denise L

    2009-12-11

    Aging leads to reduced cellular immunity with consequent increased rates of infectious disease, cancer, and autoimmunity in the elderly. The sympathetic nervous system (SNS) modulates innate and adaptive immunity via innervation of lymphoid organs. In aged Fischer 344 (F344) rats, noradrenergic (NA) nerve density in secondary lymphoid organs declines, which may contribute to immunosenescence with aging. These studies suggest there is SNS involvement in age-induced immune dysregulation. The purpose of this study was to longitudinally characterize age-related change in sympathetic innervation of the spleen and sympathetic activity/tone in male Brown Norway (BN) rats, which live longer and have a strikingly different immune profile than F344 rats, the traditional animal model for aging research. Splenic sympathetic neurotransmission was evaluated between 8 and 32 months of age by assessing (1) NA nerve fiber density, (2) splenic norepinephrine (NE) concentration, and (3) circulating catecholamine levels after decapitation. We report a decline in NA nerve density in splenic white pulp (45%) at 15 months of age compared with 8-month-old (M) rats, which is followed by a much slower rate of decline between 24 and 32 months. Lower splenic NE concentrations between 15 and 32 months of age compared with 8M rats were consistent with morphometric findings. Circulating catecholamine levels after decapitation stress generally dropped with increasing age. These findings suggest there is a sympathetic-to-immune system dysregulation beginning at middle age. Given the unique T-helper-2 bias in BN rats, altered sympathetic-immune communication may be important for understanding the age-related rise in asthma and autoimmunity.

  8. Analysis and measurement of the sympathetic and sensory innervation of white and brown adipose tissue.

    Science.gov (United States)

    Vaughan, Cheryl H; Zarebidaki, Eleen; Ehlen, J Christopher; Bartness, Timothy J

    2014-01-01

    Here, we provide a detailed account of how to denervate white and brown adipose tissue (WAT and BAT) and how to measure sympathetic nervous system (SNS) activity to these and other tissues neurochemically. The brain controls many of the functions of WAT and BAT via the SNS innervation of the tissues, especially lipolysis and thermogenesis, respectively. There is no clearly demonstrated parasympathetic innervation of WAT or the major interscapular BAT (IBAT) depot. WAT and BAT communicate with the brain neurally via sensory nerves. We detail the surgical denervation (eliminating both innervations) of several WAT pads and IBAT. We also detail more selective chemical denervation of the SNS innervation via intra-WAT/IBAT 6-hydroxy-dopamine (a catecholaminergic neurotoxin) injections and selective chemical sensory denervation via intra-WAT/IBAT capsaicin (a sensory nerve neurotoxin) injections. Verifications of the denervations are provided (HPLC-EC detection for SNS, ELIA for calcitonin gene-related peptide (proven sensory nerve marker)). Finally, assessment of the SNS drive to WAT/BAT or other tissues is described using the alpha-methyl-para-tyrosine method combined with HPLC-EC, a direct neurochemical measure of SNS activity. These methods have proven useful for us and for other investigators interested in innervation of adipose tissues. The chemical denervation approach has been extended to nonadipose tissues as well.

  9. Maturational changes in sympathetic and sensory innervation of the rat uterus: effects of neonatal capsaicin treatment.

    Science.gov (United States)

    Brauer, M M; Lincoln, J; Sarner, S; Blundell, D; Milner, P; Passaro, M; Burnstock, G

    1994-04-01

    The plasticity of the sympathetic and sensory innervation of the rat uterus was examined, before and after puberty, in controls and in animals where primary sensory nerves had been destroyed by neonatal capsaicin treatment. Immunohistochemical and histochemical methods were used in association with nerve density measurements and biochemical assays. The main findings were as follows: (1) Puberty was associated with a marked increase in the weight of the uterine horn, uterine cervix and parametrial tissue. This was unaffected by capsaicin treatment. (2) The sympathetic innervation of the uterine horn and parametrial tissue was reduced following puberty as revealed by a decrease in the density of noradrenaline-containing nerves and a marked decrease in the tissue concentration of noradrenaline. Sympathetic nerves supplying the uterine cervix and the blood vessels of the uterus appeared to be unaffected by puberty. (3) In contrast, the sensory supply of the uterus by substance P and calcitonin gene-related peptide-containing nerves increased in parallel with uterine growth during puberty resulting in no change in nerve density and only a slight reduction in peptide concentration. (4) Neonatal capsaicin treatment caused a long-lasting depletion of substance P- and calcitonin gene-related peptide-containing nerves. In the uterine horn and parametrial tissue, capsaicin-resistant calcitonin gene-related peptide, but not substance P, still increased with tissue weight during puberty, indeed, in the uterine horn, the relative increase was greater than in controls. (5) Sensory denervation resulted in an increase in the non-vascular sympathetic supply of the uterus, although there was a regional variation in the time course of the response. Perivascular sympathetic nerves were unaffected by capsaicin treatment. The pattern of change in non-vascular noradrenaline-containing nerves associated with puberty was similar in nature to controls. Thus, there is considerable plasticity

  10. Innervation of the rabbit cardiac ventricles.

    Science.gov (United States)

    Pauziene, Neringa; Alaburda, Paulius; Rysevaite-Kyguoliene, Kristina; Pauza, Audrys G; Inokaitis, Hermanas; Masaityte, Aiste; Rudokaite, Gabriele; Saburkina, Inga; Plisiene, Jurgita; Pauza, Dainius H

    2016-01-01

    The rabbit is widely used in experimental cardiac physiology, but the neuroanatomy of the rabbit heart remains insufficiently examined. This study aimed to ascertain the architecture of the intrinsic nerve plexus in the walls and septum of rabbit cardiac ventricles. In 51 rabbit hearts, a combined approach involving: (i) histochemical acetylcholinesterase staining of intrinsic neural structures in total cardiac ventricles; (ii) immunofluorescent labelling of intrinsic nerves, nerve fibres (NFs) and neuronal somata (NS); and (iii) transmission electron microscopy of intrinsic ventricular nerves and NFs was used. Mediastinal nerves access the ventral and lateral surfaces of both ventricles at a restricted site between the root of the ascending aorta and the pulmonary trunk. The dorsal surface of both ventricles is supplied by several epicardial nerves extending from the left dorsal ganglionated nerve subplexus on the dorsal left atrium. Ventral accessing nerves are thicker and more numerous than dorsal nerves. Intrinsic ventricular NS are rare on the conus arteriosus and the root of the pulmonary trunk. The number of ventricular NS ranged from 11 to 220 per heart. Four chemical phenotypes of NS within ventricular ganglia were identified, i.e. ganglionic cells positive for choline acetyltransferase (ChAT), neuronal nitric oxide synthase (nNOS), and biphenotypic, i.e. positive for both ChAT/nNOS and for ChAT/tyrosine hydroxylase. Clusters of small intensely fluorescent cells are distributed within or close to ganglia on the root of the pulmonary trunk, but not on the conus arteriosus. The largest and most numerous intrinsic nerves proceed within the epicardium. Scarce nerves were found near myocardial blood vessels, but the myocardium contained only a scarce meshwork of NFs. In the endocardium, large numbers of thin nerves and NFs proceed along the bundle of His and both its branches up to the apex of the ventricles. The endocardial meshwork of fine NFs was

  11. Is reduced myocardial sympathetic innervation associated with clinical symptoms of autonomic impairment in idiopathic Parkinson's disease?

    Science.gov (United States)

    Guidez, Daniel; Behnke, Stefanie; Halmer, Ramona; Dillmann, Ulrich; Faßbender, Klaus; Kirsch, Carl M; Hellwig, Dirk; Spiegel, Jörg

    2014-01-01

    Patients with idiopathic Parkinson's disease (IPD) have a reduced myocardial MIBG uptake in MIBG scintigraphy, indicating myocardial sympathetic denervation. We were interested whether this myocardial sympathetic denervation coincides with clinical symptoms of autonomic impairment in IPD patients. We performed MIBG scintigraphy, the SCOPA-AUT scale, a standardized medical history (developed in our clinic) and autonomic nervous system testing in 47 IPD patients (21 female, 26 male patients). We correlated myocardial MIBG uptake with the results of the SCOPA-AUT scale, the standardized medical history and the autonomic nervous system testing through the use of Spearman's correlation. Myocardial MIBG uptake correlated significantly (p autonomic nervous system testing (all patients: sum score, Ewing orthostasis test). Remarkably, we found more significant correlations in male than in female patients. Reduced myocardial sympathetic innervation-as revealed by MIBG scintigraphy-is associated with clinical symptoms of autonomic impairment. This association is more pronounced in male than in female patients. The cause for this gender-specific phenomenon is unclear.

  12. Peptidergic innervation of human esophageal and cardiac carcinoma

    Institute of Scientific and Technical Information of China (English)

    Shuang-Hong Lü; Yan Zhou; Hai-Ping Que; Shao-Jun Liu

    2003-01-01

    AIM: To investigate the distribution of neuropeptideimmunoreactive nerve fibers in esophageal and cardiac carcinoma as well as their relationship with tumor cells so as to explore if there is nerve innervation in esophageal and cardiac carcinoma.METHODS: Esophageal and cardiac carcinoma specimens were collected from surgical operation. One part of them were fixed immediately with 4 % paraformaldehyde and then cut with a cryostat into 40-pm-thick sections to perform immunohistochemical analysis. Antibodies of ten kinds of neuropeptide including calcitonin gene-related peptide (CGRP), galanin (GAL), substance P (SP), etc. were used for immunostaining of nerve fibers. The other part of the tumor specimens were cut into little blocks (1 mm3) and cocultured with chick embryo dorsal root ganglia (DRG) to investigate if the tumor blocks could induce the neurons of DRG to extend processes, so as to probe into the possiblereasons for the nerve fibers growing into tumors. RESULTS: Substantial amounts of neuropeptide including GAL-, NPY-, SP-immunoreactive nerve bundles and scattered nerve fibers were distributed in esophageal and cardiac carcinomas. The scattered nerve fibers waved their way among tumor cells and contacted with tumor cells closely. Some of them even encircled tumor cells. There were many varicosities aligned on the nerve fibers like beads. They were also closely related to tumor cells. In the co-culture group, about 63 %and 67 % of DRG co-cultured with esophageal and cardiac tumor blocks respectively extended enormous processes,especially on the side adjacent to the tumor, whereas in the control group (without tumor blocks), no processes grew out.CONCLUSION: Esophageal and cardiac carcinomas may be innervated by peptidergic nerve fibers, and they can induce neurons of DRG to extend processes in vitro.

  13. Alterations in perivascular sympathetic and nitrergic innervation function induced by late pregnancy in rat mesenteric arteries.

    Directory of Open Access Journals (Sweden)

    Esther Sastre

    Full Text Available We investigated whether pregnancy was associated with changed function in components of perivascular mesenteric innervation and the mechanism/s involved.We used superior mesenteric arteries from female Sprague-Dawley rats divided into two groups: control rats (in oestrous phase and pregnant rats (20 days of pregnancy. Modifications in the vasoconstrictor response to electrical field stimulation (EFS were analysed in the presence/absence of phentolamine (alpha-adrenoceptor antagonist or L-NAME (nitric oxide synthase-NOS- non-specific inhibitor. Vasomotor responses to noradrenaline (NA, and to NO donor DEA-NO were studied, NA and NO release measured and neuronal NOS (nNOS expression/activation analysed.EFS induced a lower frequency-dependent contraction in pregnant than in control rats. Phentolamine decreased EFS-induced vasoconstriction in segments from both experimental groups, but to a greater extent in control rats. EFS-induced vasoconstriction was increased by L-NAME in arteries from both experimental groups. This increase was greater in segments from pregnant rats. Pregnancy decreased NA release while increasing NO release. nNOS expression was not modified but nNOS activation was increased by pregnancy. Pregnancy decreased NA-induced vasoconstriction response and did not modify DEA-NO-induced vasodilation response.Neural control of mesenteric vasomotor tone was altered by pregnancy. Diminished sympathetic and enhanced nitrergic components both contributed to the decreased vasoconstriction response to EFS during pregnancy. All these changes indicate the selective participation of sympathetic and nitrergic innervations in vascular adaptations produced during pregnancy.

  14. The clinical value of cardiac sympathetic imaging in heart failure

    DEFF Research Database (Denmark)

    Christensen, Thomas Emil; Kjaer, Andreas; Hasbak, Philip

    2014-01-01

    The autonomic nervous system plays an important role in the pathology of heart failure. The single-photon emission computed tomography tracer iodine-123-metaiodobenzylguanidine ((123) I-MIBG) can be used to investigate the activity of the predominant neurotransmitter of the sympathetic nervous...... system, norepinephrine. Also, positron emission tomography tracers are being developed for the same purpose. With (123) I-MIBG as a starting point, this brief review introduces the modalities used for cardiac sympathetic imaging....

  15. Removal of half the sympathetic innervation does not reduce vasoconstrictor responses in rat tail artery.

    Science.gov (United States)

    Tripovic, Diana; McLachlan, Elspeth M; Brock, James A

    2013-06-01

    Following reinnervation of denervated rat tail arteries, nerve-evoked contractions are at least as large as those evoked in normally innervated arteries despite a much lower nerve terminal density. Here nerve-evoked contractions have been investigated after transection of half the sympathetic innervation of normal tail arteries. After 1 week, the noradrenergic plexus 50-70 mm along the tail was about half as dense as control. Excitatory junction potentials recorded in smooth muscle cells of arterial segments isolated in vitro were half their normal amplitude. Surprisingly, nerve-evoked contractions of isometrically mounted segments were not reduced in amplitude, as was also the case after only 3 days. After 1 week, enhancement of nerve-evoked contractions by blocking either neuronal re-uptake of noradrenaline with desmethylimipramine or prejunctional α2-adrenoceptors with idazoxan was similar to control, suggesting that these mechanisms are matched to the number of innervating axons. The relative contribution of postjunctional α2-adrenoceptors to contractions evoked by long trains of stimuli was enhanced but that of α1-adrenoceptors was unchanged. Transiently, sensitivity to the α1-adrenoceptor agonist phenylephrine was slightly increased. After 7 weeks, amplitudes of nerve-evoked contractions remained similar to control, and sensitivity to phenylephrine had recovered but that to the α2-adrenoceptor agonist clonidine was slightly raised. The normal amplitude of nerve-evoked contractions after partial denervation is only partly explained by the greater contribution of α2-adrenoceptors. While the post-receptor mechanisms activated by nerve-released transmitter may be modified to amplify the contractions after partial denervation, our findings suggest that these mechanisms are normally saturated, at least in this artery.

  16. The articulo-cardiac sympathetic reflex in spinalized, anesthetized rats.

    Science.gov (United States)

    Nakayama, Tomohiro; Suzuki, Atsuko; Ito, Ryuzo

    2006-04-01

    Somatic afferent regulation of heart rate by noxious knee joint stimulation has been proven in anesthetized cats to be a reflex response whose reflex center is in the brain and whose efferent arc is a cardiac sympathetic nerve. In the present study we examined whether articular stimulation could influence heart rate by this efferent sympathetic pathway in spinalized rats. In central nervous system (CNS)-intact rats, noxious articular movement of either the knee or elbow joint resulted in an increase in cardiac sympathetic nerve activity and heart rate. However, although in acutely spinalized rats a noxious movement of the elbow joint resulted in a significant increase in cardiac sympathetic nerve activity and heart rate, a noxious movement of the knee joint had no such effect and resulted in only a marginal increase in heart rate. Because this marginal increase was abolished by adrenalectomy suggests that it was due to the release of adrenal catecholamines. In conclusion, the spinal cord appears to be capable of mediating, by way of cardiac sympathetic nerves, the propriospinally induced reflex increase in heart rate that follows noxious stimulation of the elbow joint, but not the knee joint.

  17. Cardiac sympathetic nerve terminal function in congestive heart failure

    Institute of Scientific and Technical Information of China (English)

    Chang-seng LIANG

    2007-01-01

    Increased cardiac release of norepinephrine (NE) and depleted cardiac stores of NE are two salient features of the human failing heart. Researches from my labo-ratory have shown that these changes are accompanied by a functional defect of NE uptake in the cardiac sympathetic nerve terminals. Our studies have shown that the decrease of NE uptake is caused by reduction of NE transporter density in the sympathetic nerve endings, and this change is responsible, at least in part, for the increased myocardial interstitial NE, decreased myocardial adrenoceptor density, and increased myocyte apoptosis in experimental cardiomyopathies. We have also provided evidence in both intact animals and cultured PC12 cells that the decrease of NE transporter is induced by the actions of oxidative metabolites of exogenous NE, involving endoplasmic reticulum stress and impaired N-glycosylation of the NE transporter. This change in the cardiac sympathetic NE uptake function, as demonstrated by [123I] metaiodobenzylguanidine in human studies, may not only serve as an important prognostic variable in patients with congestive heart failure, but also be used as a surrogate for the efficacies of various therapeutic interventions for heart failure. Finally, increasing evidence suggests and further studies are needed to show that the cardiac sympathetic nerve terminal function may be a direct target for pharmacologic treatment of congestive heart failure.

  18. Sitagliptin attenuates sympathetic innervation via modulating reactive oxygen species and interstitial adenosine in infarcted rat hearts.

    Science.gov (United States)

    Lee, Tsung-Ming; Chen, Wei-Ting; Yang, Chen-Chia; Lin, Shinn-Zong; Chang, Nen-Chung

    2015-02-01

    We investigated whether sitagliptin, a dipeptidyl peptidase-4 (DPP-4) inhibitor, attenuates arrhythmias through inhibiting nerve growth factor (NGF) expression in post-infarcted normoglycemic rats, focusing on adenosine and reactive oxygen species production. DPP-4 bound adenosine deaminase has been shown to catalyse extracellular adenosine to inosine. DPP-4 inhibitors increased adenosine levels by inhibiting the complex formation. Normoglycemic male Wistar rats were subjected to coronary ligation and then randomized to either saline or sitagliptin in in vivo and ex vivo studies. Post-infarction was associated with increased oxidative stress, as measured by myocardial superoxide, nitrotyrosine and dihydroethidium fluorescent staining. Measurement of myocardial norepinephrine levels revealed a significant elevation in vehicle-treated infarcted rats compared with sham. Compared with vehicle, infarcted rats treated with sitagliptin significantly increased interstitial adenosine levels and attenuated oxidative stress. Sympathetic hyperinnervation was blunted after administering sitagliptin, as assessed by immunofluorescent analysis and western blotting and real-time quantitative RT-PCR of NGF. Arrhythmic scores in the sitagliptin-treated infarcted rats were significantly lower than those in vehicle. Ex vivo studies showed a similar effect of erythro-9-(2-hydroxy-3-nonyl) adenine (an adenosine deaminase inhibitor) to sitagliptin on attenuated levels of superoxide and NGF. Furthermore, the beneficial effects of sitagliptin on superoxide anion production and NGF levels can be reversed by 8-cyclopentyl-1,3-dipropulxanthine (adenosine A1 receptor antagonist) and exogenous hypoxanthine. Sitagliptin protects ventricular arrhythmias by attenuating sympathetic innervation via adenosine A1 receptor and xanthine oxidase-dependent pathways, which converge through the attenuated formation of superoxide in the non-diabetic infarcted rats.

  19. Sympathetic re-innervation of myocardium after liver transplant in the hereditary amyloid neuropathy; Reinnervation sympathique du myocarde apres transplantation hepatique dans la neuropathie amyloide hereditaire

    Energy Technology Data Exchange (ETDEWEB)

    Delahaye, N.; Le Guludec, D. [Medecine Nucleaire, Hopital Bichat, Paris (France); Slama, M. [Cardiologie, Hopital A.Beclere, Paris (France); Guyen, C.N. [SHFJ, DSV-CEA, Orsay (France); Dinanian, S. [Cardiologie, Hopital A.Beclere, Paris (France); Merlet, P. [SHFJ, DSV-CEA, Orsay (France)

    1997-12-31

    The hereditary amyloid neuropathy (HAN) is characterized by a progressive sensory-motor poly-neuropathy and a dysautonomia with myocardium sympathetic denervation. This is established by MIBL scintigraphy and may enhance the troubles of conduction and of cardiac rhythm. The amyloid deposits are constituted of anomalous pre-albumin fabricated by liver. The hepatic transplant (HT) is the only known treatment. Four patients (GI: 39 {+-} 5 years) have been studied by MIBG scintigraphy, 2.2 {+-} 0.7 years after HT, and compared with 12 patients (GII: 39 {+-} 12 years) studied before HT. The left ventricular function, the coronary arteries and the at-rest scintigraphy with thallium were normal for all of them. The cardiac capture of MIBG, evaluated by the cardio-mediastinal activity ratio (C/M), measured on an anterior thoracic planar acquisition performed 4 hours after the intravenous injection of 300 MBq, was higher for GI than for GII (1.49 {+-} 0.12 vs 1.29 {+-} 0.13, p 0.02). The washouts (4 h / 20 min) were not different. In tomography, the patients of GI presented focal anomalies with a more-or-less extended apical defect, a satisfying fixation of the basal half of the anterior wall, more-or-less overflowing the septal and lateral walls, and for 2 patients, a satisfying inferior fixation. On the contrary, 9/12 patients of GII have had a diffuse absence of fixation, the other three heaving a satisfying antero-basal fixation ({chi}{sup 2}, p = 0.05). The results are not explained by difference of severity or evolution duration of HAN. Thus, it appears that there exists a sympathetic re-innervation of myocardium after HT in the HAN, debuting by the heart base, similarly with the effect of anatomic interruption of innervation in cardiac transplants

  20. Age-associated alterations in sympathetic noradrenergic innervation of primary and secondary lymphoid organs in female Fischer 344 rats.

    Science.gov (United States)

    ThyagaRajan, Srinivasan; Madden, Kelley S; Teruya, Brian; Stevens, Suzanne Y; Felten, David L; Bellinger, Denise L

    2011-04-01

    Normal aging processes, as well as, psychological stress affect the immune system; each can act alone, or interact with each other, to cause dysregulation of immune function substantially altering physical and mental health. The sympathetic nervous system (SNS), a major mediator of stress effects on immune function, is significantly affected by normal aging process, and stress can affect aging of the SNS. Previously, we have shown age-associated changes in sympathetic noradrenergic (NA) innervation of lymphoid organs in male rodents that affect immune regulation. The purpose of this study was to investigate sympathetic innervation of lymphoid organs and associated alterations in immune responses in young and aging female Fischer 344 (F344) rats. Histofluorescence and immunocytochemistry for NA innervation, and neurochemistry for norepinephrine (NE) levels were performed in the thymus, spleen, and mesenteric lymph nodes (MLN) isolated from 3-month-old young (normal estrous cycle), 8- to 9-month-old (onset of irregular estrous cycling), and 24-25 month, and 30-31 month female F344 rats (acyclic) at diestrus based on vaginal smears. Age-related alterations in natural killer (NK) cell activity, interleukin-2 (IL-2) and interferon-γ (IFN-γ) production, T and B lymphocyte proliferation were examined in splenocytes. Sympathetic NA innervation and NE levels increased with aging in the thymus, declined in spleen and MLN, and was accompanied by significant reductions in NK cell activity, IL-2 and IFN-γ production, and T and B cell proliferation in old female rats. In 8-9 mo rats, NE levels in the hilar region of the spleen and IFN-γ production were unaltered, while NE levels in the end region of the spleen and IL-2 production were reduced. Collectively, these results suggest that aging is characterized by significant alterations in sympathetic NA innervation in the thymus, spleen, and MLN associated with immunosuppression, and that there is a marked shift in NA activity

  1. Impact of sympathetic innervation on recurrent life-threatening arrhythmias in the follow-up of patients with idiopathic ventricular fibrillation

    Energy Technology Data Exchange (ETDEWEB)

    Paul, Matthias; Acil, Tayfun; Breithardt, Guenter; Wichter, Thomas [Hospital of the University of Muenster, Department of Cardiology and Angiology, Muenster (Germany); Schaefers, Michael; Kies, Peter; Schaefers, Klaus; Schober, Otmar [Hospital of the University of Muenster, Department of Nuclear Medicine, Muenster (Germany)

    2006-08-15

    Idiopathic ventricular fibrillation (IVF) is defined as VF in the absence of any identifiable structural or functional cardiac disease. The underlying pathophysiological mechanisms are unknown. This study was performed to investigate the potential impact of sympathetic dysfunction, assessed by {sup 123}I-meta-iodo-benzylguanidine scintigraphy ({sup 123}I-MIBG SPECT), on the long-term prognosis of patients with IVF. {sup 123}I-MIBG SPECT was performed in 20 patients (mean age 37{+-}13 years) with IVF. Mean follow-up of patients after study entry was 7.2{+-}1.5 years (range 4.9-10.5 years). Ten patients (five men, five women; mean age 43{+-}12 years; p=NS versus study group) with medullary carcinoma of the thyroid gland served as an age-matched control group. Abnormal {sup 123}I-MIBG uptake was observed in 13 patients (65%). During follow-up, 18 episodes of VF/fast polymorphic ventricular tachycardias occurred in four IVF patients with abnormal {sup 123}I-MIBG uptake whereas only two episodes of monomorphic ventricular tachycardia (and no VF) occurred in a single IVF patient with normal {sup 123}I-MIBG uptake. Impairment of sympathetic innervation may indicate a higher risk of future recurrent episodes of life-threatening ventricular tachyarrhythmias in patients with IVF. Studies in larger cohorts are required to validate the significance of {sup 123}I-MIBG SPECT during the long-term follow-up of these patients. (orig.)

  2. Vagal cardiac efferent innervation in F344 rats: Effects of chronic intermittent hypoxia.

    Science.gov (United States)

    Cheng, Zixi Jack

    2017-03-01

    Chronic intermittent hypoxia (CIH), which is a physiological consequence of obstructive sleep apnea, reduces baroreflex control of heart rate (HR). Previously, we showed that the heart rate (HR) response to electrical stimulation of the vagal efferent nerve was significantly increased following CIH in F344 rats. Since vagal cardiac efferent from the nucleus ambiguus (NA) project to cardiac ganglia and regulate HR, we hypothesized that vagal cardiac efferent innervation of cardiac ganglia is reorganized. Young adult F344 rats were exposed either to room air (RA) or to intermittent hypoxia for 35-50days. Fluorescent tracer DiI was injected into the NA to label vagal efferent innervation of cardiac ganglia which had been counterstained by Fluoro-Gold (FG) injections (i.p). Confocal microscopy was used to examine vagal cardiac efferent axons and terminals in cardiac ganglia. NA axons entered cardiac ganglia and innervated principal neurons (PNs) with robust basket endings in both RA control and CIH animals. In addition, the percentage of PNs which were innervated by DiI-labeled fibers in ganglia was similar. In CIH rats, abnormally large swollen cardiac axon segments and disorganized terminals as well as leaky endings were observed. In general, vagal efferent terminal varicosities around PNs appeared larger and the number of varicosities was significantly increased. Interestingly, some cardiac axons had sprouting-like terminal structures in the cardiac ganglia as well as in cardiac muscle, which had not been found in RA control. Finally, CIH increased the size of PNs and reduced the ratio of nucleus to PN somata. Thus, CIH significantly remodeled the structure of vagal cardiac axons and terminals in cardiac ganglia as well as cardiac PNs.

  3. Origins of the sympathetic innervation of the cervical end of the uterus in the rat.

    Science.gov (United States)

    Vera, P L; Haase, E B; Schramm, L P

    1997-01-30

    A retrograde neuronal tracer (Fast Blue) was injected in the cervical end of the uterine horn of virgin rats. The majority of the retrogradely labeled post-ganglionic sympathetic neurons were found in the sympathetic chain (74%). The superior mesenteric ganglia, inferior mesenteric ganglia and suprarenal ganglia accounted for 22, 3 and uterus resembles that described for other pelvic organs.

  4. Cardiac sympathetic imaging with mIBG in cirrhosis and portal hypertension

    DEFF Research Database (Denmark)

    Møller, Søren; Mortensen, Christian; Bendtsen, Flemming

    2012-01-01

    Autonomic and cardiac dysfunction is frequent in cirrhosis and includes increased sympathetic nervous activity, impaired heart rate variability (HRV), and baroreflex sensitivity (BRS). Quantified (123)I-metaiodobenzylguanidine (mIBG) scintigraphy reflects cardiac noradrenaline uptake, and in pati...

  5. Cardiac Sympathetic Hyperactivity after Chemotherapy: Early Sign of Cardiotoxicity?

    Energy Technology Data Exchange (ETDEWEB)

    Guimarães, Sarita Lígia Pessoa de Melo Machado [Pós-Graduação em Ciências da Saúde da Universidade Federal de Pernambuco (PGCS-UFPE), Recife, PE (Brazil); Hospital Agamenon Magalhães (HAM), Recife, PE (Brazil); Brandão, Simone Cristina Soares, E-mail: simonecordis@yahoo.com.br [Pós-Graduação em Ciências da Saúde da Universidade Federal de Pernambuco (PGCS-UFPE), Recife, PE (Brazil); Andrade, Luciana Raposo [Hospital Santa Joana, Recife, PE (Brazil); Maia, Rafael José Coelho [Pós-Graduação em Ciências da Saúde da Universidade Federal de Pernambuco (PGCS-UFPE), Recife, PE (Brazil); Hospital Agamenon Magalhães (HAM), Recife, PE (Brazil); Markman Filho, Brivaldo [Pós-Graduação em Ciências da Saúde da Universidade Federal de Pernambuco (PGCS-UFPE), Recife, PE (Brazil)

    2015-09-15

    Chemotherapy with anthracyclines and trastuzumab can cause cardiotoxicity. Alteration of cardiac adrenergic function assessed by metaiodobenzylguanidine labeled with iodine-123 ({sup 123}I-mIBG) seems to precede the drop in left ventricular ejection fraction. To evaluate and to compare the presence of cardiovascular abnormalities among patients with breast cancer undergoing chemotherapy with anthracyclines and trastuzumab, and only with anthracycline. Patients with breast cancer were analyzed clinical, laboratory, electrocardiographic and echocardiographic and cardiac sympathetic activity. In scintigraphic images, the ratio of {sup 123}I-mIBG uptake between the heart and mediastinum, and the washout rate were calculated. The variables were compared between patients who received anthracyclines and trastuzumab (Group 1) and only anthracyclines (Group 2). Twenty patients, with mean age 57 ± 14 years, were studied. The mean left ventricular ejection fraction by echocardiography was 67.8 ± 4.0%. Mean washout rate was 28.39 ± 9.23% and the ratio of {sup 123}I-mIBG uptake between the heart and mediastinum was 2.07 ± 0.28. Of the patients, 82% showed an increased in washout rate, and the ratio of {sup 123}I-mIBG uptake between the heart and mediastinum decreased in 25%. Concerning the groups, the mean washout rate of Group 1 was 32.68 ± 9.30% and of Group 2 was 24.56 ± 7.72% (p = 0,06). The ratio of {sup 123}I-mIBG uptake between the heart and mediastinum was normal in all patients in Group 2, however, the Group 1, showed 50% the ratio of {sup 123}I-mIBG uptake between the heart and mediastinum ≤ 1.8 (p = 0.02). In women with breast cancer undergoing chemotherapy, assessment of cardiac sympathetic activity with {sup 123}I-mIBG appears to be an early marker of cardiotoxicity. The combination of chemotherapy showed higher risk of cardiac adrenergic hyperactivity.

  6. Tritiated thymidine autoradiographic study on the influence of sensory and sympathetic innervation on periodontal wound healing in the rat.

    Science.gov (United States)

    Wucherpfennig, A L; Chiego, D J; Avery, J K

    1990-01-01

    Understanding of wound healing mechanisms is important in designing preventive and therapeutic approaches to inflammatory periodontal diseases, which are a major cause of dental morbidity. In this study, cell proliferation was assessed after an experimental gingival wound; this was preceded by either resection of 3 mm of the inferior alveolar nerve, total extirpation of the superior cervical ganglion, trauma to those structures or sham operations. At different times, animals were pulsed with 0.5 microCi/g body weight of tritiated thymidine; histological sections were processed for quantitative autoradiography of different compartments of the periodontium. Wounding led to a significant increase in cell proliferation in the epithelial layer, the fibroblast compartment and the periodontal ligament, but not in the alveolar crest compartment. Sympathetic denervation significantly enhanced this response in the epithelial layer, the fibroblast compartment and the alveolar crest, whereas sensory denervation only modified the response in the fibroblast layer. Thus it appears that sympathetic innervation plays an important role in the regulation of cell proliferation in the periodontium and that pharmacological modulation of sympathetic activity should be further studied as a therapeutic approach in periodontal disease.

  7. Cardiac sympathetic dysfunction in anti-NMDA receptor encephalitis.

    Science.gov (United States)

    Byun, Jung-Ick; Lee, Soon-Tae; Moon, Jangsup; Jung, Keun-Hwa; Shin, Jung-Won; Sunwoo, Jun-Sang; Lim, Jung-Ah; Shin, Yong-Won; Kim, Tae-Joon; Lee, Keon-Joo; Park, Kyung-Il; Jung, Ki-Young; Lee, Sang Kun; Chu, Kon

    2015-12-01

    Patients with anti-NMDA receptor (anti-NMDAR) encephalitis frequently suffer from autonomic dysfunctions, which can cause substantial morbidity. This study assessed cardiac autonomic functions in patients with anti-NMDAR encephalitis using heart rate variability (HRV) analysis. This was a retrospective single-center case-control study. Eleven patients with anti-NMDAR encephalitis and 15 age- and sex-matched controls were included in this study. To ensure that autonomic dysfunction does not occur in any encephalitis, we additionally analyzed HRV of 9 patients with herpes encephalitis (HSE) and compared with that of NMDAR encephalitis patients and controls. Five minute resting stationary electrocardiogram was collected from each subject, and HRV was analyzed. Total power and low frequency (LF) power were lower in anti-NMDAR encephalitis patients than those in controls (p=0.005, 0.001 respectively), indicating cardiac autonomic dysfunction especially in sympathetic system. Patients with HSE showed no significant difference in HRV parameters compared with that of controls. Cardiac autonomic dysfunction was associated with 3 month functional outcome in anti-NMDAR encephalitis patients.

  8. Sympathetic cardiac hyperinnervation and atrial autonomic imbalance in diet-induced obesity promote cardiac arrhythmias.

    Science.gov (United States)

    McCully, Belinda H; Hasan, Wohaib; Streiff, Cole T; Houle, Jennifer C; Woodward, William R; Giraud, George D; Brooks, Virginia L; Habecker, Beth A

    2013-11-15

    Obesity increases the risk of arrhythmias and sudden cardiac death, but the mechanisms are unknown. This study tested the hypothesis that obesity-induced cardiac sympathetic outgrowth and hyperinnervation promotes the development of arrhythmic events. Male Sprague-Dawley rats (250-275 g), fed a high-fat diet (33% kcal/fat), diverged into obesity-resistant (OR) and obesity-prone (OP) groups and were compared with rats fed normal chow (13% kcal/fat; CON). In vitro experiments showed that both OR and OP rats exhibited hyperinnervation of the heart and high sympathetic outgrowth compared with CON rats, even though OR rats are not obese. Despite the hyperinnervation and outgrowth, we showed that, in vivo, OR rats were less susceptible to arrhythmic events after an intravenous epinephrine challenge compared with OP rats. On examining total and stimulus-evoked neurotransmitter levels in an ex vivo system, we demonstrate that atrial acetylcholine content and release were attenuated in OP compared with OR and CON groups. OP rats also expressed elevated atrial norepinephrine content, while norepinephrine release was suppressed. These findings suggest that the consumption of a high-fat diet, even in the absence of overt obesity, stimulates sympathetic outgrowth and hyperinnervation of the heart. However, normalized cardiac parasympathetic nervous system control may protect the heart from arrhythmic events.

  9. Development of cardiac parasympathetic neurons, glial cells, and regional cholinergic innervation of the mouse heart.

    Science.gov (United States)

    Fregoso, S P; Hoover, D B

    2012-09-27

    Very little is known about the development of cardiac parasympathetic ganglia and cholinergic innervation of the mouse heart. Accordingly, we evaluated the growth of cholinergic neurons and nerve fibers in mouse hearts from embryonic day 18.5 (E18.5) through postnatal day 21(P21). Cholinergic perikarya and varicose nerve fibers were identified in paraffin sections immunostained for the vesicular acetylcholine transporter (VAChT). Satellite cells and Schwann cells in adjacent sections were identified by immunostaining for S100β calcium binding protein (S100) and brain-fatty acid binding protein (B-FABP). We found that cardiac ganglia had formed in close association to the atria and cholinergic innervation of the atrioventricular junction had already begun by E18.5. However, most cholinergic innervation of the heart, including the sinoatrial node, developed postnatally (P0.5-P21) along with a doubling of the cross-sectional area of cholinergic perikarya. Satellite cells were present throughout neonatal cardiac ganglia and expressed primarily B-FABP. As they became more mature at P21, satellite cells stained strongly for both B-FABP and S100. Satellite cells appeared to surround most cardiac parasympathetic neurons, even in neonatal hearts. Mature Schwann cells, identified by morphology and strong staining for S100, were already present at E18.5 in atrial regions that receive cholinergic innervation at later developmental times. The abundance and distribution of S100-positive Schwann cells increased postnatally along with nerve density. While S100 staining of cardiac Schwann cells was maintained in P21 and older mice, Schwann cells did not show B-FABP staining at these times. Parallel development of satellite cells and cholinergic perikarya in the cardiac ganglia and the increase in abundance of Schwann cells and varicose cholinergic nerve fibers in the atria suggest that neuronal-glial interactions could be important for development of the parasympathetic nervous

  10. Sympathetic innervation of the upper and lower regions of the uterus and cervix in the rat have different origins and routes.

    Science.gov (United States)

    Houdeau, E; Rousseau, A; Meusnier, C; Prud'Homme, M J; Rousseau, J P

    1998-09-28

    The origins and routes of the postganglionic sympathetic nerve supply to the upper and lower uterus and to the cervix were investigated in the rat by using denervation procedures combined with immunohistochemistry and retrograde tracing. The sympathetic nerve fibers of the upper part of the uterus arise from the ovarian plexus nerve. They mainly originate (90%) from neurons of the suprarenal ganglia (SRG) and of the T10 to L3 ganglia of the paravertebral sympathetic chain. Fluoro-Gold injections into different regions of the upper uterus showed that the SRG neurons mainly provide innervation to the tubal extremity (52%) rather than to the uterine portion below this area (26%). Very few neurons of the celiac ganglion or the aorticorenal ganglia participated in this innervation. Most of the sympathetic innervation of the lower uterus and the cervix (90%) originates from neurons of the paravertebral ganglia T13 to S2, principally at the L2-L4 levels. By using immunocytochemistry, we show that very few tyrosine hydroxylase-positive neurons of the pelvic plexus project to these areas, where they represent only 3% of the sympathetic nerve supply. Again, very few neurons of the inferior mesenteric ganglion (IMG) supply the lower uterus and the cervix. The comparison between retrograde tracing experiments in intact animals and after the removal of the IMG shows that very few sympathetic postganglionic axons from the paravertebral chain pass through the IMG to reach the lower uterus and the cervix. In contrast, these axons mainly project to splanchnic nerves bypassing the IMG to connect with the hypogastric nerves. In addition, some axons supplying the lower uterus follow the superior vesical arteries and then reach the organ. Taken together, these results show that the upper region of the uterus receives a sympathetic innervation that is different in origin and route from that of the lower uterus and the cervix. Such a marked region-specific innervation suggests that nerve

  11. Alterations of left ventricular deformation and cardiac sympathetic derangement in patients with systolic heart failure: a 3D speckle tracking echocardiography and cardiac {sup 123}I-MIBG study

    Energy Technology Data Exchange (ETDEWEB)

    Leosco, Dario; Parisi, Valentina; Pagano, Gennaro; Femminella, Grazia Daniela; Bevilacqua, Agnese; Formisano, Roberto; Ferro, Gaetana; De Lucia, Claudio; Ferrara, Nicola [University Federico II, Department of Translational Medical Science, Naples (Italy); Pellegrino, Teresa [Italian National Research Council (CNR), Institute of Biostructure and Bioimaging, Naples (Italy); University Federico II, Department of Advanced Biomedical Science, Naples (Italy); Paolillo, Stefania [University Federico II, Department of Advanced Biomedical Science, Naples (Italy); SDN Foundation, Institute of Diagnostic and Nuclear Development, Naples (Italy); Prastaro, Maria; Filardi, Pasquale Perrone; Cuocolo, Alberto [University Federico II, Department of Advanced Biomedical Science, Naples (Italy); Rengo, Giuseppe [University Federico II, Department of Translational Medical Science, Naples (Italy); Salvatore Maugeri Foundation, IRCCS, Istituto di Telese, Benevento, BN (Italy)

    2015-09-15

    Myocardial contractile function is under the control of cardiac sympathetic activity. Three-dimensional speckle tracking echocardiography (3D-STE) and cardiac imaging with {sup 123}I-metaiodobenzylguanidine ({sup 123}I-MIBG) are two sophisticated techniques for the assessment of left ventricular (LV) deformation and sympathetic innervation, respectively, which offer important prognostic information in patients with heart failure (HF). The purpose of this investigation was to explore, in patients with systolic HF, the relationship between LV deformation assessed by 3D-STE and cardiac sympathetic derangement evaluated by {sup 123}I-MIBG imaging. We prospectively studied 75 patients with systolic HF. All patients underwent a 3D-STE study (longitudinal, circumferential, area and radial) and {sup 123}I-MIBG planar and SPECT cardiac imaging. 3D-STE longitudinal, circumferential and area strain values were correlated with {sup 123}I-MIBG late heart to mediastinum (H/M) ratio and late SPECT total defect score. After stratification of the patients according to ischaemic or nonischaemic HF aetiology, we observed a good correlation of all 3D-STE measurements with late H/M ratio and SPECT data in the ischaemic group, but in patients with HF of nonischaemic aetiology, no correlation was found between LV deformation and cardiac sympathetic activity. At the regional level, the strongest correlation between LV deformation and adrenergic innervation was found for the left anterior descending coronary artery distribution territory for all four 3D-STE values. In multivariate linear regression analyses, including age, gender, LV ejection fraction, NYHA class, body mass index, heart rate and HF aetiology, only 3D-STE area and radial strain values significantly predicted cardiac sympathetic derangement on {sup 123}I-MIBG late SPECT. This study indicated that 3D-STE measurements are correlated with {sup 123}I-MIBG planar and SPECT data. Furthermore, 3D-STE area and radial strain values

  12. Double labelling immunohistochemical characterization of autonomic sympathetic neurons innervating the sow retractor clitoridis muscle

    Directory of Open Access Journals (Sweden)

    L Ragionieri

    2009-08-01

    Full Text Available Retrograde neuronal tracing and immunohistochemical methods were used to define the neurochemical content of sympathetic neurons projecting to the sow retractor clitoridis muscle (RCM. Differently from the other smooth muscles of genital organs, the RCM is an isolated muscle that is tonically contracted in the rest phase and relaxed in the active phase. This peculiarity makes it an interesting experimental model. The fluorescent tracer fast blue was injected into the RCM of three 50 kg subjects. After a one-week survival period, the ipsilateral paravertebral ganglion S1, that in a preliminary study showed the greatest number of cells projecting to the muscle, was collected from each animal. The co-existence of tyrosine hydroxylase with choline acetyltransferase, neuronal nitric oxide synthase, calcitonin gene-related peptide, leuenkephalin, neuropeptide Y, substance P and vasoactive intestinal polypeptide was studied under a fluorescent microscope on cryostat sections. Tyrosine hydroxylase was present in about 58% of the neurons projecting to the muscle and was found to be co-localized with each of the other tested substances.Within fast blue-labelled cells negative to the adrenergic marker, small populations of neurons singularly containing each of the other enzymatic markers or peptides were also observed. The present study documents the complexity of the neurochemical interactions that regulate the activity of the smooth myocytes of the RCM and their vascular components.

  13. {sup 123}I-Labelled metaiodobenzylguanidine for the evaluation of cardiac sympathetic denervation in early stage amyloidosis

    Energy Technology Data Exchange (ETDEWEB)

    Noordzij, Walter; Glaudemans, Andor W.J.M.; Rheenen, Ronald W.J. van; Dierckx, Rudi A.J.O.; Slart, Riemer H.J.A. [University of Groningen, Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen, PO Box 30.001, Groningen (Netherlands); Hazenberg, Bouke P.C. [University of Groningen, Department of Rheumatology and Clinical Immunology, University Medical Center Groningen, Groningen (Netherlands); Tio, Rene A. [University of Groningen, Department of Cardiology, University Medical Center Groningen, Groningen (Netherlands)

    2012-10-15

    Cardiac amyloidosis is a rare disorder, but it may lead to potentially life-threatening restrictive cardiomyopathy. Cardiac manifestations frequently occur in primary amyloidosis (AL) and familial amyloidosis (ATTR), but are uncommon in secondary amyloidosis (AA). Echocardiography is the method of choice for assessing cardiac amyloidosis. Amyloid deposits impair the function of sympathetic nerve endings. Disturbance of myocardial sympathetic innervations may play an important role in the remodelling process. {sup 123}I-MIBG can detect these innervation changes. Patients with biopsy-proven amyloidosis underwent general work-up, echocardiography and {sup 123}I-MIBG scintigraphy. Left ventricular internal dimensions and wall thickness were measured, and highly refractile cardiac echoes (sparkling) were analysed. Early (15 min) and late (4 h) heart-to-mediastinum ratio (HMR) and wash-out rate were determined after administration of MIBG. Included in the study were 61 patients (30 women and 31 men; mean age 62 years; 39 AL, 11 AA, 11 ATTR). Echocardiographic parameters were not significantly different between the groups. Sparkling was present in 72 % of ATTR patients, in 54 % of AL patients and in 45 % of AA patients. Mean late HMR in all patients was 2.3 {+-} 0.75, and the mean wash-out rate was 8.6 {+-} 14 % (the latter not significantly different between the patient groups). Late HMR was significantly lower in patients with echocardiographic signs of amyloidosis than in patients without (2.0 {+-} 0.70 versus 2.8 {+-} 0.58, p < 0.001). Wash-out rates were significantly higher in these patients (-3.3 {+-} 9.9 % vs. 17 {+-} 10 %, p < 0.001). In ATTR patients without echocardiographic signs of amyloidosis, HMR was lower than in patients with the other types (2.0 {+-} 0.59 vs. 2.9 {+-} 0.50, p = 0.007). MIBG HMR is lower and wash-out rate is higher in patients with echocardiographic signs of amyloidosis. Also, {sup 123}I-MIBG scintigraphy can detect cardiac denervation in

  14. Control of ketogenesis in the perfused rat liver by the sympathetic innervation.

    Science.gov (United States)

    Beuers, U; Beckh, K; Jungermann, K

    1986-07-01

    The regulation of ketogenesis by the hepatic nerves was investigated in the rat liver perfused in situ. Electrical stimulation of the hepatic nerves around the portal vein and the hepatic artery caused a reduction of basal ketogenesis owing to a decrease in acetoacetate release to 30% with essentially no change in 3-hydroxybutyrate release. At the same time, as observed before [Hartmann et al. (1982) Eur. J. Biochem. 123, 521-526], nerve stimulation increased glucose output, shifted lactate uptake to output and decreased perfusion flow. Ketogenesis from oleate, which enters the mitochondria via the carnitine system, was also lowered after nerve stimulation owing to a decrease of acetoacetate release to 30% with no alteration in 3-hydroxybutyrate release. Ketogenesis from octanoate, which enters the mitochondria independently of the carnitine system, was decreased after nerve stimulation as a result of a drastic decrease of acetoacetate output to 15% and a less pronounced decrease of 3-hydroxybutyrate release to 65%. Noradrenaline mimicked the metabolic nerve effects on ketogenesis only at the highly unphysiological concentration of 0.1 microM under basal conditions and in the presence of oleate as well as partly in the presence of octanoate. It was essentially not effective at a concentration of 0.01 microM, which might be reached in the sinusoids owing to overflow from the hepatic vasculature. Sodium nitroprusside prevented the hemodynamic changes after nerve stimulation; it did not affect the nerve-dependent reduction of ketogenesis under basal conditions and in the presence of oleate, yet it diminished the nerve effect on octanoate-dependent ketogenesis. Phentolamine clearly reduced the metabolic and hemodynamic nerve effects, while propranolol was without effect. The present data suggest that hepatic ketogenesis was inhibited by stimulation of alpha-sympathetic liver nerves directly rather than indirectly via hemodynamic changes or noradrenaline overflow from

  15. Expressions of cardiac sympathetic norepinephrine transporter and β1-adrenergic receptor decreased in aged rats

    Institute of Scientific and Technical Information of China (English)

    He LI; Xiao-qing MA; Fan YE; Jing ZHANG; Xin ZHOU; Zhi-hong WANG; Yu-ming LI; Guo-yuan ZHANG

    2009-01-01

    Evidence suggests that the deterioration of communication between the sympathetic nervous system and cardiovas-cular system always accompanies the aging of human and animals. Cardiac sympathetic norepinephrine (NE) transporter (NET) on presynaptic membrane is a predominant component to eliminate released NE in the synaptic cleff and maintains the sensitivity of the β-adrenergic receptor (β-AR). In the present study, we investigated NET and β1-AR mRNA levels and sympathetic nerve density in cardiac sympathetic ganglion and leff ventricular myocardium in 2- and 16-month-old rats with Northern blot analysis and immunohistochemistry. The expression levels of NET mRNA, NET protein and β1-AR mRNA in the ganglia or myocardia of 16-month-old rats were markedly reduced by 67%, 26%, and 43%, respectively, in comparison with those in 2-month-old rats. Our results also show that aging induces a strong decrease of the catecholaminergic nerve fiber density.

  16. Association between left ventricular regional sympathetic denervation and mechanical dyssynchrony in phase analysis: a cardiac CZT study

    Energy Technology Data Exchange (ETDEWEB)

    Gimelli, Alessia; Genovesi, Dario; Giorgetti, Assuero; Kusch, Annette [Fondazione Toscana Gabriele Monasterio, Pisa (Italy); Liga, Riccardo [Scuola Superiore Sant' Anna, Pisa (Italy); Marzullo, Paolo [Fondazione Toscana Gabriele Monasterio, Pisa (Italy); CNR, Institute of Clinical Physiology, Pisa (Italy)

    2014-05-15

    To evaluate the relationships among myocardial sympathetic innervation, perfusion and mechanical synchronicity assessed with cardiac cadmium-zinc-telluride (CZT) scintigraphy. A group of 29 patients underwent an evaluation of myocardial perfusion with {sup 99m}Tc-tetrofosmin CZT scintigraphy and adrenergic innervation with {sup 123}I-metaiodobenzylguanidine (MIBG) CZT scintigraphy. The summed rest score (SRS), motion score (SMS) and thickening score (STS), as well as the summed {sup 123}I-MIBG defect score (SS-MIBG), were determined. Regional tracer uptake for both {sup 99m}Tc-tetrofosmin and {sup 123}I-MIBG was also calculated. Finally, the presence of significant myocardial mechanical dyssynchrony was evaluated in phase analysis on gated CZT images and the region of latest mechanical activation identified. Significant mechanical dyssynchrony was present in 17 patients (59 %) and associated with higher SRS (P = 0.030), SMS (P < 0.001), STS (P = 0.003) and early SS-MIBG (P = 0.037) as well as greater impairments in left ventricular ejection fraction (P < 0.001) and end-diastolic volume (P < 0.001). In multivariate analysis a higher end-diastolic volume remained the only predictor of mechanical dyssynchrony (P = 0.047). Interestingly, while in the whole population regional myocardial perfusion and adrenergic activity were strongly correlated (R = 0.68), in patients with mechanical dyssynchrony the region of latest mechanical activation was predicted only by greater impairment in regional {sup 123}I-MIBG uptake (P = 0.012) that overwhelmed the effect of depressed regional perfusion. Left ventricular mechanical dyssynchrony is associated with greater depression in contractile function and greater impairments in regional myocardial perfusion and sympathetic activity. In patients with dyssynchrony, the region of latest mechanical activation is characterized by a significantly altered adrenergic tone. (orig.)

  17. Characteristics of regional sympathetic innervation in diabetic patients with silent myocardial ischemia assessed by {sup 123}I-metaiodobenzylguanidine imaging

    Energy Technology Data Exchange (ETDEWEB)

    Matsuo, Shinro; Takahashi, Masayuki; Yoshida, Shintaro; Inoue, Tohru; Nakamura, Yasuyuki; Mitsunami, Kenichi; Kinoshita, Masahiro [Shiga Univ. of Medical Science, Otsu (Japan)

    1996-05-01

    The purpose of this study was to clarify any association between clinically detectable silent myocardial ischemia (SMI) and myocardial {sup 123}I-metaiodobenzylguanidine (MIBG) uptake. Subjects of this study were patients with SMI with diabetes (n=15), patients with angina pectoris with diabetes (n=15), patients with SMI without diabetes (n=8) and normal subjects (n=23). Subjects underwent planar and single photon-emission-computed tomography (SPECT) imaging 15 min and 3 hours after injection of {sup 123}I-MIBG. H/M ratio was significantly lower in diabetic SMI (2.1{+-}0.3) and non-diabetic SMI (2.3{+-}0.3) than control subjects (2.6{+-}0.3). The inferior-to-anterior wall count ratio (I/A) in diabetic SMI group was the lowest among all groups (p<0.05). A significant difference was observed in relative regional uptake in the inferior segment of the distal left ventricle between SMI and angina group in patients with diabetes mellittus (p<0.05). The decreased MIBG uptake in the inferior wall may be an important sign of cardiac sympathetic dysfunction, suggesting the abnormalities in cardiac nervous system play an important role in the mechanism of diabetic silent myocardial ischemia. (author)

  18. Effects of short-term carvedilol on the cardiac sympathetic activity assessed by {sup 123}I-MIBG scintigraphy

    Energy Technology Data Exchange (ETDEWEB)

    Miranda, Sandra Marina Ribeiro de; Mesquita, Evandro Tinoco; Freire, Fabiano de Lima; Ribeiro, Mario Luiz; Nobrega, Antonio Claudio Lucas da; Mesquita, Claudio Tinoco, E-mail: sandramarina@cardiol.b [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil); Azevedo, Jader Cunha; Barbirato, Gustavo Borges; Coimbra, Alexandro [Hospital Pro-Cardiaco, Rio de Janeiro, RJ (Brazil); Dohmann, Hans Fernando da Rocha [Centro de Ensino e Pesquisa do Pro-Cardiaco (PROCEP), Rio de Janeiro, RJ (Brazil)

    2010-03-15

    Background: autonomic alterations in heart failure are associated with an increase in morbimortality. Several noninvasive methods have been employed to evaluate the sympathetic function, including the Meta-Iodobenzylguanidine ({sup 123}I-MIBG) scintigraphy imaging of the heart. Objective: to evaluate the cardiac sympathetic activity through {sup 123}I-MIBG scintigraphy, before and after three months of carvedilol therapy in patients with heart failure and left ventricular ejection fraction (LVEF) < 45%. Patients and methods: sixteen patients, aged 56.3 +- 12.6 years (11 males), with a mean LVEF of 28% +- 8% and no previous use of beta-blockers were recruited for the study. Images of the heart innervation were acquired with {sup 123}I-MIBG, and the serum levels of catecholamines (epinephrine, dopamine and norepinephrine) were measured; the radioisotope ventriculography (RIV) was performed before and after a three-month therapy with carvedilol. Results: patients' functional class showed improvement: before the treatment, 50% of the patients were FC II and 50% were FC III. After 3 months, 7 patients were FC I (43.8%) and 9 were FC II (56.2%), (rho = 0.0001). The mean LVEF assessed by RIV increased from 29% to 33% (rho = 0.017). There was no significant variation in cardiac adrenergic activity assessed by {sup 123}I-MIBG (early and late resting images and washout rate). No significant variation was observed regarding the measurement of catecholamines. Conclusion: the short-term treatment with carvedilol promoted the clinical and LVEF improvement. However, this was not associated to an improvement in the cardiac adrenergic activity, assessed by {sup 123}I-MIBG scintigraphy, as well as the measurement of circulating catecholamines. (author)

  19. Heart failure causes cholinergic transdifferentiation of cardiac sympathetic nerves via gp130-signaling cytokines in rodents.

    Science.gov (United States)

    Kanazawa, Hideaki; Ieda, Masaki; Kimura, Kensuke; Arai, Takahide; Kawaguchi-Manabe, Haruko; Matsuhashi, Tomohiro; Endo, Jin; Sano, Motoaki; Kawakami, Takashi; Kimura, Tokuhiro; Monkawa, Toshiaki; Hayashi, Matsuhiko; Iwanami, Akio; Okano, Hideyuki; Okada, Yasunori; Ishibashi-Ueda, Hatsue; Ogawa, Satoshi; Fukuda, Keiichi

    2010-02-01

    Although several cytokines and neurotrophic factors induce sympathetic neurons to transdifferentiate into cholinergic neurons in vitro, the physiological and pathophysiological roles of this remain unknown. During congestive heart failure (CHF), sympathetic neural tone is upregulated, but there is a paradoxical reduction in norepinephrine synthesis and reuptake in the cardiac sympathetic nervous system (SNS). Here we examined whether cholinergic transdifferentiation can occur in the cardiac SNS in rodent models of CHF and investigated the underlying molecular mechanism(s) using genetically modified mice. We used Dahl salt-sensitive rats to model CHF and found that, upon CHF induction, the cardiac SNS clearly acquired cholinergic characteristics. Of the various cholinergic differentiation factors, leukemia inhibitory factor (LIF) and cardiotrophin-1 were strongly upregulated in the ventricles of rats with CHF. Further, LIF and cardiotrophin-1 secreted from cultured failing rat cardiomyocytes induced cholinergic transdifferentiation in cultured sympathetic neurons, and this process was reversed by siRNAs targeting Lif and cardiotrophin-1. Consistent with the data in rats, heart-specific overexpression of LIF in mice caused cholinergic transdifferentiation in the cardiac SNS. Further, SNS-specific targeting of the gene encoding the gp130 subunit of the receptor for LIF and cardiotrophin-1 in mice prevented CHF-induced cholinergic transdifferentiation. Cholinergic transdifferentiation was also observed in the cardiac SNS of autopsied patients with CHF. Thus, CHF causes target-dependent cholinergic transdifferentiation of the cardiac SNS via gp130-signaling cytokines secreted from the failing myocardium.

  20. Perinatal exposure to a high-fat diet is associated with reduced hepatic sympathetic innervation in one-year old male Japanese macaques.

    Directory of Open Access Journals (Sweden)

    Wilmon F Grant

    Full Text Available Our group recently demonstrated that maternal high-fat diet (HFD consumption is associated with non-alcoholic fatty liver disease, increased apoptosis, and changes in gluconeogenic gene expression and chromatin structure in fetal nonhuman primate (NHP liver. However, little is known about the long-term effects that a HFD has on hepatic nervous system development in offspring, a system that plays an important role in regulating hepatic metabolism. Utilizing immunohistochemistry and Real-Time PCR, we quantified sympathetic nerve fiber density, apoptosis, inflammation, and other autonomic components in the livers of fetal and one-year old Japanese macaques chronically exposed to a HFD. We found that HFD exposure in-utero and throughout the postnatal period (HFD/HFD, when compared to animals receiving a CTR diet for the same developmental period (CTR/CTR, is associated with a 1.7 fold decrease in periportal sympathetic innervation, a 5 fold decrease in parenchymal sympathetic innervation, and a 2.5 fold increase in hepatic apoptosis in the livers of one-year old male animals. Additionally, we observed an increase in hepatic inflammation and a decrease in a key component of the cholinergic anti-inflammatory pathway in one-year old HFD/HFD offspring. Taken together, these findings reinforce the impact that continuous exposure to a HFD has in the development of long-term hepatic pathologies in offspring and highlights a potential neuroanatomical basis for hepatic metabolic dysfunction.

  1. LMI1195 PET imaging in evaluation of regional cardiac sympathetic denervation and its potential role in antiarrhythmic drug treatment

    Energy Technology Data Exchange (ETDEWEB)

    Yu, Ming; Bozek, Jody; Lamoy, Melanie; Kagan, Mikhail; Benites, Pedro; Onthank, David; Robinson, Simon P. [Lantheus Medical Imaging, Discovery Research, N. Billerica, MA (United States)

    2012-12-15

    Regional cardiac sympathetic denervation (RCSD) associated with reduced noradrenaline transporter (NAT) function has been linked to cardiac arrhythmia. This study examined the association of LMI1195, an {sup 18}F-labeled NAT substrate developed for positron emission tomography (PET) imaging, with NAT in vitro, and its imaging to detect RCSD and guide antiarrhythmic drug treatment in vivo. LMI1195 association with NAT was assessed in comparison with other substrates, noradrenaline (NA) and {sup 123}I-metaiodobenzylguanidine (MIBG), in NAT-expressing cells. LMI1195 cardiac imaging was performed for evaluation of RCSD in a rabbit model surgically developed by regional phenol application on the left ventricular (LV) wall. The normal LV areas in images were quantified as regions with radioactivity {>=}50 % maximum. Potential impact of RCSD on dofetilide, an antiarrhythmic drug, induced ECG changes was assessed. NAT blockade with desipramine reduced LMI1195 cell uptake by 90 {+-} 3 %, similar to NA and MIBG. NA, MIBG, or self inhibited LMI1195 cell uptake concentration-dependently with comparable IC{sub 50} values (1.09, 0.21, and 0.90 {mu}M). LMI1195 cardiac imaging differentiated innervated and denervated areas in RCSD rabbits. The surgery resulted in a large denervated LV area at 2 weeks which was partially recovered at 12 weeks. Myocardial perfusion imaging with flurpiridaz F 18 showed normal perfusion in RCSD areas. Dofetilide induced more prominent QTc prolongation in RCSD than control animals. However, changes in heart rate were comparable. LMI1195 exhibits high association with NAT and can be used for imaging RCSD. The detected RCSD increases cardiac risks to the antiarrhythmic drug, dofetilide, by inducing more QTc prolongation. (orig.)

  2. Sympathetic innervation of the carotid bifurcation in the rabbit and cat: blood vessels, carotid body and carotid sinus. A fluorescence and electron microscopic study.

    Science.gov (United States)

    Knoche, H; Kienecker, E W

    1977-10-21

    Two postganglionic branches of the superior cervical ganglion enter the area of the carotid bifurcation in the rabbit and the cat. The common and external carotid arteries receive a rich adrenergic nerve supply, which can be demonstrated by fluorophores of biogenic amines appearing after formaldehyde treatment. The internal carotid artery is only sparsely innervated; however, it shows a dense sympathetic supply at the site of pressor receptors. Following removal of the superior cervical ganglion, a total loss of fluorescent adrenergic nerves occurs and degeneration of nerve endings possessing dense core vesicles is conspicuous. These nerve terminals are situated mainly subendothelially in the carotid body sinusoids; they only rarely terminate on type I cells.

  3. A novel electrophilic synthesis and evaluation of medium specific radioactivity (1R,2S)-4-[{sup 18}F]fluorometaraminol, a tracer for the assessment of cardiac sympathetic nerve integrity with PET

    Energy Technology Data Exchange (ETDEWEB)

    Eskola, Olli E-mail: olesko@utu.fi; Groenroos, Tove; Bergman, Joergen; Haaparanta, Merja; Marjamaeki, Paeivi; Lehikoinen, Pertti; Forsback, Sarita; Langer, Oliver; Hinnen, Francoise; Dolle, Frederic; Halldin, Christer; Solin, Olof

    2004-01-01

    (1R,2S)-4-[{sup 18}F]fluorometaraminol (4-[{sup 18}F]FMR), a tracer for cardiac sympathetic innervation, was synthesized by electrophilic aromatic substitution. A trimethylstannyl precursor, protected with tert-butoxycarbonyl protecting groups, was radiofluorinated with high specific radioactivity [{sup 18}F]F{sub 2}. Specific radioactivity of 4-[{sup 18}F]FMR, in average 11.8 {+-}3.3 GBq/{mu}mol, was improved 40-800-fold in comparison to the previous electrophilic fluorinations. The biodistribution of 4-[{sup 18}F]FMR in rat was in accordance with the known distribution of sympathetic innervation. 4-[{sup 18}F]FMR showed no metabolic degradation in left ventricle of rat heart, where the uptake was high, rapid and specific.

  4. Pacemaker current inhibition in experimental human cardiac sympathetic activation: a double-blind, randomized, crossover study

    NARCIS (Netherlands)

    Schroeder, C.; Heusser, K.; Zoerner, A.A.; Grosshennig, A.; Wenzel, D.; May, M.; Sweep, F.C.; Mehling, H.; Luft, F.C.; Tank, J.; Jordan, J.

    2014-01-01

    Hyperpolarization-activated, cyclic nucleotide-gated 4 (HCN4) channels comprise the final pathway for autonomic heart rate (HR) regulation. We hypothesized that HCN4 inhibition could reverse autonomic imbalance in a human model of cardiac sympathetic activation. Nineteen healthy men ingested oral me

  5. Co-localization of histamine and norepinephrine in sympathetic ganglia and exocytosis of endogenous histamine from cardiac sympathetic nerve endings of macaca mulatto monkey

    Institute of Scientific and Technical Information of China (English)

    Ming-kaiLI; Xiao-xingLUO; Liang-weiCHEN; ZhongCHEN; JiaMENG; JingHU; Yu-meiWU; Jing-ruMENG; ZhengHOU; XueMA

    2005-01-01

    AIM To provide the evidence about localization, biosynthesis, metabolism and release of histamine from the cardiac sympathetic nerve terminals, and endogenous sympathetic histamine could inhibit itsel frelease from the nerve terminal through the presynaptic histamine H3 receptor. METHODS Using double-labeled immunohistochemistry to observe the co-localization of histamine and NE in the superior cer-vical ganglia (SCG) of macaca mulatto monkey; Different-speed centrifugation to obtain the cardiac sympathetic nerve terminal model (the cardiac synaptosomes), spectrofluorometer and ELISA techniques to detect the release of histamine from the cardiacsynaptosomes. RESULTS ( 1 ) The coexistence of histamine and norepinephrine immunoreactivities was identified in the same neuron within SCG of macaca mulatto monkey. (2) Depolarization of macaca mulatto monkey cardiac synaptosomes with 50 mmol/L potassium caused the release of endogenous histamine,

  6. Central Sympathetic Inhibition: a Neglected Approach for Treatment of Cardiac Arrhythmias?

    Science.gov (United States)

    Cagnoni, Francesca; Destro, Maurizio; Bontempelli, Erika; Locatelli, Giovanni; Hering, Dagmara; Schlaich, Markus P

    2016-02-01

    Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia. Overactivation of the sympathetic nervous system (SNS) plays an important role in the pathogenesis of comorbidities related to AF such as hypertension, congestive heart failure, obesity, insulin resistance, and obstructive sleep apnea. Methods that reduce sympathetic drive, such as centrally acting sympatho-inhibitory agents, have been shown to reduce the incidence of spontaneous or induced atrial arrhythmias, suggesting that neuromodulation may be helpful in controlling AF. Moxonidine acts centrally to reduce activity of the SNS, and clinical trials indicate that this is associated with a decreased AF burden in hypertensive patients with paroxysmal AF and reduced post-ablation recurrence of AF in patients with hypertension who underwent pulmonary vein isolation (PVI). Furthermore, device-based approaches to reduce sympathetic drive, such as renal denervation, have yielded promising results in the prevention and treatment of cardiac arrhythmias. In light of these recent findings, targeting elevated sympathetic drive with either pharmacological or device-based approaches has become a focus of clinical research. Here, we review the data currently available to explore the potential utility of sympatho-inhibitory therapies in the prevention and treatment of cardiac arrhythmias.

  7. Quantifying cardiac sympathetic and parasympathetic nervous activities using principal dynamic modes analysis of heart rate variability.

    Science.gov (United States)

    Zhong, Yuru; Jan, Kung-Ming; Ju, Ki Hwan; Chon, Ki H

    2006-09-01

    The ratio between low-frequency (LF) and high-frequency (HF) spectral power of heart rate has been used as an approximate index for determining the autonomic nervous system (ANS) balance. An accurate assessment of the ANS balance can only be achieved if clear separation of the dynamics of the sympathetic and parasympathetic nervous activities can be obtained, which is a daunting task because they are nonlinear and have overlapping dynamics. In this study, a promising nonlinear method, termed the principal dynamic mode (PDM) method, is used to separate dynamic components of the sympathetic and parasympathetic nervous activities on the basis of ECG signal, and the results are compared with the power spectral approach to assessing the ANS balance. The PDM analysis based on the 28 subjects consistently resulted in a clear separation of the two nervous systems, which have similar frequency characteristics for parasympathetic and sympathetic activities as those reported in the literature. With the application of atropine, in 13 of 15 supine subjects there was an increase in the sympathetic-to-parasympathetic ratio (SPR) due to a greater decrease of parasympathetic than sympathetic activity (P=0.003), and all 13 subjects in the upright position had a decrease in SPR due to a greater decrease of sympathetic than parasympathetic activity (Pparasympathetic and sympathetic nervous systems. The culprit is equivalent decreases in both the sympathetic and parasympathetic activities irrespective of the pharmacological blockades. These findings suggest that the PDM shows promise as a noninvasive and quantitative marker of ANS imbalance, which has been shown to be a factor in many cardiac and stress-related diseases.

  8. Changes in cardiac innervation during maturation in long-term diabetes.

    Science.gov (United States)

    Bakovic, Marija; Juric Paic, Marina; Zdrilic, Elena; Vukojevic, Katarina; Ferhatovic, Lejla; Marin, Ana; Filipovic, Natalija; Grkovic, Ivica; Puljak, Livia

    2013-12-01

    Diabetic autonomic neuropathy being a common complication of diabetes mellitus (DM) is related to an increased risk of cardiovascular mortality. However, mechanisms underlying changes of innervation density in affected hearts remain insufficiently understood. Hence, the aim of this study was to describe quantitative changes of intra-myocardial nerve terminals in hearts of diabetic rats of various ages. Male Sprague-Dawley rats were injected with 55mg/kg streptozotocin (STZ) (DM group) or with citrate buffer (control). After 2weeks, 2months, 6months and 12months, sections of their hearts were analyzed in five areas-left ventricle, interventricular septum, right ventricle, anterior and posterior wall. Nerve fibers were visualized immunohistochemically, using antibody against a general neuronal marker, protein gene product 9.5 (PGP 9.5). Significant increase in total nerve fibers from all heart areas was observed 2weeks and 2months after diabetes induction, followed by a decrease at 6months and again increase at 12months was observed in both control and diabetic rats. Significant difference between control and diabetic rats was visible after 2weeks and 2months, with diabetic rats exhibiting significantly more nerve fibers. There were no consistent differences in quantity of nerve fibers in different areas of the heart within a particular age-related group of animals. In conclusion, cardiac innervation undergoes dynamic changes both in control and in diabetic rats, with a time-dependent significant increase in neuronal fiber density in diabetic animals. This novel information may contribute to our understanding of pathophysiological changes associated with diabetic cardiac neuropathy.

  9. Dynamic molecular imaging of cardiac innervation using a dual headpinhole SPECT system

    Energy Technology Data Exchange (ETDEWEB)

    Hu, Jicun; Boutchko, Rostyslav; Sitek, Arkadiusz; Reutter, BryanW.; Huesman, Ronald H.; Gullberg, Grant T.

    2008-03-29

    Typically 123I-MIBG is used for the study of innervation andfunction of the sympathetic nervous system in heart failure. The protocolinvolves two studies: first a planar or SPECT scan is performed tomeasure initial uptake of the tracer, followed some 3-4 hours later byanother study measuring the wash-out of the tracer from the heart. A fastwash-out is indicative of a compromised heart. In this work, a dual headpinhole SPECT system was used for imaging the distribution and kineticsof 123I-MIBG in the myocardium of spontaneous hypertensive rats (SHR) andnormotensive Wistar Kyoto (WKY) rats. The system geometry was calibratedbased on a nonlinear point projection fitting method using a three-pointsource phantom. The angle variation effect of the parameters was modeledwith a sinusoidal function. A dynamic acquisition was performed byinjecting 123I-MIBG into rats immediately after starting the dataacquisition. The detectors rotated continuously performing a 360o dataacquisition every 90 seconds. We applied the factor analysis (FA)methodand region of interest (ROI) sampling method to obtain time activitycurves (TACs)in the blood pool and myocardium and then appliedtwo-compartment modeling to estimate the kinetic parameters. Since theinitial injection bolus is too fast for obtaining a consistenttomographic data set in the first few minutes of the study, we appliedthe FA method directly to projections during the first rotation. Then thetime active curves for blood and myocardial tissue were obtained from ROIsampling. The method was applied to determine if there were differencesin the kinetics between SHR and WKY rats and requires less time byreplacing the delayed scan at 3-4 hours after injection with a dynamicacquisition over 90 to 120 minutes. The results of a faster washout and asmaller distribution volume of 123IMIBG near the end of life in the SHRmodel of hypertrophic cardiomyopthy may be indicative of a failing heartin late stages of heart failure.

  10. Chronic orthostatic intolerance: a disorder with discordant cardiac and vascular sympathetic control

    Science.gov (United States)

    Furlan, R.; Jacob, G.; Snell, M.; Robertson, D.; Porta, A.; Harris, P.; Mosqueda-Garcia, R.

    1998-01-01

    BACKGROUND: Chronic orthostatic intolerance (COI) is a debilitating autonomic condition in young adults. Its neurohumoral and hemodynamic profiles suggest possible alterations of postural sympathetic function and of baroreflex control of heart rate (HR). METHODS AND RESULTS: In 16 COI patients and 16 healthy volunteers, intra-arterial blood pressure (BP), ECG, central venous pressure (CVP), and muscle sympathetic nerve activity (MSNA) were recorded at rest and during 75 degrees tilt. Spectral analysis of RR interval and systolic arterial pressure (SAP) variabilities provided indices of sympathovagal modulation of the sinoatrial node (ratio of low-frequency to high-frequency components, LF/HF) and of sympathetic vasomotor control (LFSAP). Baroreflex mechanisms were assessed (1) by the slope of the regression line obtained from changes of RR interval and MSNA evoked by pharmacologically induced alterations in BP and (2) by the index alpha, obtained from cross-spectral analysis of RR and SAP variabilities. At rest, HR, MSNA, LF/HF, and LFSAP were higher in COI patients, whereas BP and CVP were similar in the two groups. During tilt, BP did not change and CVP fell by the same extent in the 2 groups; the increase of HR and LF/HF was more pronounced in COI patients. Conversely, the increase of MSNA was lower in COI than in control subjects. Baroreflex sensitivity was similar in COI and control subjects at rest; tilt reduced alpha similarly in both groups. CONCLUSIONS: COI is characterized by an overall enhancement of noradrenergic tone at rest and by a blunted postganglionic sympathetic response to standing, with a compensatory cardiac sympathetic overactivity. Baroreflex mechanisms maintain their functional responsiveness. These data suggest that in COI, the functional distribution of central sympathetic tone to the heart and vasculature is abnormal.

  11. Cardiac sympathetic nervous system imaging with (123)I-meta-iodobenzylguanidine: Perspectives from Japan and Europe.

    Science.gov (United States)

    Nakajima, Kenichi; Scholte, Arthur J H A; Nakata, Tomoaki; Dimitriu-Leen, Aukelien C; Chikamori, Taishiro; Vitola, João V; Yoshinaga, Keiichiro

    2017-03-13

    Cardiac sympathetic nervous system dysfunction is closely associated with risk of serious cardiac events in patients with heart failure (HF), including HF progression, pump-failure death, and sudden cardiac death by lethal ventricular arrhythmia. For cardiac sympathetic nervous system imaging, (123)I-meta-iodobenzylguanidine ((123)I-MIBG) was approved by the Japanese Ministry of Health, Labour and Welfare in 1992 and has therefore been widely used since in clinical settings. (123)I-MIBG was also later approved by the Food and Drug Administration (FDA) in the United States of America (USA) and it was expected to achieve broad acceptance. In Europe, (123)I-MIBG is currently used only for clinical research. This review article is based on a joint symposium of the Japanese Society of Nuclear Cardiology (JSNC) and the American Society of Nuclear Cardiology (ASNC), which was held in the annual meeting of JSNC in July 2016. JSNC members and a member of ASNC discussed the standardization of (123)I-MIBG parameters, and clinical aspects of (123)I-MIBG with a view to further promoting (123)I-MIBG imaging in Asia, the USA, Europe, and the rest of the world.

  12. Usefulness of Cardiac Sympathetic Nerve Imaging Using (123)Iodine-Metaiodobenzylguanidine Scintigraphy for Predicting Sudden Cardiac Death in Patients With Heart Failure.

    Science.gov (United States)

    Kasama, Shu; Toyama, Takuji; Kurabayashi, Masahiko

    2016-01-01

    The autonomic nervous system plays an important role in the human heart. Activation of the cardiac sympathetic nervous system is a cardinal pathophysiological abnormality associated with the failing human heart. Myocardial imaging using (123)I-metaiodobenzylguanidine (MIBG), an analog of norepinephrine, can be used to investigate the activity of norepinephrine, the predominant neurotransmitter of the sympathetic nervous system. Many clinical trials have demonstrated that (123)I-MIBG scintigraphic parameters predict cardiac adverse events, especially sudden cardiac death, in patients with heart failure. In this review, we summarize results from published studies that have focused on the use of cardiac sympathetic nerve imaging using (123)I-MIBG scintigraphy for risk stratification of sudden cardiac death in patients with heart failure.

  13. Cardiac-locked bursts of muscle sympathetic nerve activity are absent in familial dysautonomia.

    Science.gov (United States)

    Macefield, Vaughan G; Norcliffe-Kaufmann, Lucy; Axelrod, Felicia B; Kaufmann, Horacio

    2013-02-01

    Familial dysautonomia (Riley-Day syndrome) is an hereditary sensory and autonomic neuropathy (HSAN type III), expressed at birth, that is associated with reduced pain and temperature sensibilities and absent baroreflexes, causing orthostatic hypotension as well as labile blood pressure that increases markedly during emotional excitement. Given the apparent absence of functional baroreceptor afferents, we tested the hypothesis that the normal cardiac-locked bursts of muscle sympathetic nerve activity (MSNA) are absent in patients with familial dysautonomia. Tungsten microelectrodes were inserted percutaneously into muscle or cutaneous fascicles of the common peroneal nerve in 12 patients with familial dysautonomia. Spontaneous bursts of MSNA were absent in all patients, but in five patients we found evidence of tonically firing sympathetic neurones, with no cardiac rhythmicity, that increased their spontaneous discharge during emotional arousal but not during a manoeuvre that unloads the baroreceptors. Conversely, skin sympathetic nerve activity (SSNA), recorded in four patients, appeared normal. We conclude that the loss of phasic bursts of MSNA and the loss of baroreflex modulation of muscle vasoconstrictor drive contributes to the poor control of blood pressure in familial dysautonomia, and that the increase in tonic firing of muscle vasoconstrictor neurones contributes to the increase in blood pressure during emotional excitement.

  14. Cardiac Dysregulation and Myocardial Injury in a 6-Hydroxydopamine-Induced Rat Model of Sympathetic Denervation.

    Directory of Open Access Journals (Sweden)

    Yue-Hua Jiang

    Full Text Available Cardiac sympathetic denervation is found in various cardiac pathologies; however, its relationship with myocardial injury has not been thoroughly investigated.Twenty-four rats were assigned to the normal control group (NC, sympathectomy control group (SC, and a sympathectomy plus mecobalamin group (SM. Sympathectomy was induced by injection of 6-OHDA, after which, the destruction and distribution of sympathetic and vagal nerve in the left ventricle (LV myocardial tissue were determined by immunofluorescence and ELISA. Heart rate variability (HRV, ECG and echocardiography, and assays for myocardial enzymes in serum before and after sympathectomy were examined. Morphologic changes in the LV by HE staining and transmission electron microscope were used to estimate levels of myocardial injury and concentrations of inflammatory cytokines were used to reflect the inflammatory reaction.Injection of 6-OHDA decreased NE (933.1 ± 179 ng/L for SC vs. 3418.1± 443.6 ng/L for NC, P < 0.01 and increased NGF (479.4± 56.5 ng/mL for SC vs. 315.85 ± 28.6 ng/mL for NC, P < 0.01 concentrations. TH expression was reduced, while ChAT expression showed no change. Sympathectomy caused decreased HRV and abnormal ECG and echocardiography results, and histopathologic examinations showed myocardial injury and increased collagen deposition as well as inflammatory cell infiltration in the cardiac tissue of rats in the SC and SM groups. However, all pathologic changes in the SM group were less severe compared to those in the SC group.Chemical sympathectomy with administration of 6-OHDA caused dysregulation of the cardiac autonomic nervous system and myocardial injuries. Mecobalamin alleviated inflammatory and myocardial damage by protecting myocardial sympathetic nerves.

  15. Heart Rate Changes in Response to Mechanical Pressure Stimulation of Skeletal Muscles Are Mediated by Cardiac Sympathetic Nerve Activity

    Science.gov (United States)

    Watanabe, Nobuhiro; Hotta, Harumi

    2017-01-01

    Stimulation of mechanoreceptors in skeletal muscles such as contraction and stretch elicits reflexive autonomic nervous system changes which impact cardiovascular control. There are pressure-sensitive mechanoreceptors in skeletal muscles. Mechanical pressure stimulation of skeletal muscles can induce reflex changes in heart rate (HR) and blood pressure, although the neural mechanisms underlying this effect are unclear. We examined the contribution of cardiac autonomic nerves to HR responses induced by mechanical pressure stimulation (30 s, ~10 N/cm2) of calf muscles in isoflurane-anesthetized rats. Animals were artificially ventilated and kept warm using a heating pad and lamp, and respiration and core body temperature were maintained within physiological ranges. Mechanical stimulation was applied using a stimulation probe 6 mm in diameter with a flat surface. Cardiac sympathetic and vagus nerves were blocked to test the contribution of the autonomic nerves. For sympathetic nerve block, bilateral stellate ganglia, and cervical sympathetic nerves were surgically sectioned, and for vagus nerve block, the nerve was bilaterally severed. In addition, mass discharges of cardiac sympathetic efferent nerve were electrophysiologically recorded. Mechanical stimulation increased or decreased HR in autonomic nerve-intact rats (range: −56 to +10 bpm), and the responses were negatively correlated with pre-stimulus HR (r = −0.65, p = 0.001). Stimulation-induced HR responses were markedly attenuated by blocking the cardiac sympathetic nerve (range: −9 to +3 bpm, p mechanical stimulation increased, or decreased the frequency of sympathetic nerve activity in parallel with HR (r = 0.77, p = 0.0004). Furthermore, the changes in sympathetic nerve activity were negatively correlated with its tonic level (r = −0.62, p = 0.0066). These results suggest that cardiac sympathetic nerve activity regulates HR responses to muscle mechanical pressure stimulation and the direction of HR

  16. Cholinergic Signaling Exerts Protective Effects in Models of Sympathetic Hyperactivity-Induced Cardiac Dysfunction

    Science.gov (United States)

    Gavioli, Mariana; Lara, Aline; Almeida, Pedro W. M.; Lima, Augusto Martins; Damasceno, Denis D.; Rocha-Resende, Cibele; Ladeira, Marina; Resende, Rodrigo R.; Martinelli, Patricia M.; Melo, Marcos Barrouin; Brum, Patricia C.; Fontes, Marco Antonio Peliky; Souza Santos, Robson A.; Prado, Marco A. M.; Guatimosim, Silvia

    2014-01-01

    Cholinergic control of the heart is exerted by two distinct branches; the autonomic component represented by the parasympathetic nervous system, and the recently described non-neuronal cardiomyocyte cholinergic machinery. Previous evidence has shown that reduced cholinergic function leads to deleterious effects on the myocardium. Yet, whether conditions of increased cholinergic signaling can offset the pathological remodeling induced by sympathetic hyperactivity, and its consequences for these two cholinergic axes are unknown. Here, we investigated two models of sympathetic hyperactivity: i) the chronic beta-adrenergic receptor stimulation evoked by isoproterenol (ISO), and ii) the α2A/α2C-adrenergic receptor knockout (KO) mice that lack pre-synaptic adrenergic receptors. In both models, cholinergic signaling was increased by administration of the cholinesterase inhibitor, pyridostigmine. First, we observed that isoproterenol produces an autonomic imbalance characterized by increased sympathetic and reduced parasympathetic tone. Under this condition transcripts for cholinergic proteins were upregulated in ventricular myocytes, indicating that non-neuronal cholinergic machinery is activated during adrenergic overdrive. Pyridostigmine treatment prevented the effects of ISO on autonomic function and on the ventricular cholinergic machinery, and inhibited cardiac remodeling. α2A/α2C-KO mice presented reduced ventricular contraction when compared to wild-type mice, and this dysfunction was also reversed by cholinesterase inhibition. Thus, the cardiac parasympathetic system and non-neuronal cardiomyocyte cholinergic machinery are modulated in opposite directions under conditions of increased sympathetic drive or ACh availability. Moreover, our data support the idea that pyridostigmine by restoring ACh availability is beneficial in heart disease. PMID:24992197

  17. Cholinergic signaling exerts protective effects in models of sympathetic hyperactivity-induced cardiac dysfunction.

    Directory of Open Access Journals (Sweden)

    Mariana Gavioli

    Full Text Available Cholinergic control of the heart is exerted by two distinct branches; the autonomic component represented by the parasympathetic nervous system, and the recently described non-neuronal cardiomyocyte cholinergic machinery. Previous evidence has shown that reduced cholinergic function leads to deleterious effects on the myocardium. Yet, whether conditions of increased cholinergic signaling can offset the pathological remodeling induced by sympathetic hyperactivity, and its consequences for these two cholinergic axes are unknown. Here, we investigated two models of sympathetic hyperactivity: i the chronic beta-adrenergic receptor stimulation evoked by isoproterenol (ISO, and ii the α2A/α2C-adrenergic receptor knockout (KO mice that lack pre-synaptic adrenergic receptors. In both models, cholinergic signaling was increased by administration of the cholinesterase inhibitor, pyridostigmine. First, we observed that isoproterenol produces an autonomic imbalance characterized by increased sympathetic and reduced parasympathetic tone. Under this condition transcripts for cholinergic proteins were upregulated in ventricular myocytes, indicating that non-neuronal cholinergic machinery is activated during adrenergic overdrive. Pyridostigmine treatment prevented the effects of ISO on autonomic function and on the ventricular cholinergic machinery, and inhibited cardiac remodeling. α2A/α2C-KO mice presented reduced ventricular contraction when compared to wild-type mice, and this dysfunction was also reversed by cholinesterase inhibition. Thus, the cardiac parasympathetic system and non-neuronal cardiomyocyte cholinergic machinery are modulated in opposite directions under conditions of increased sympathetic drive or ACh availability. Moreover, our data support the idea that pyridostigmine by restoring ACh availability is beneficial in heart disease.

  18. Selective quantification of the cardiac sympathetic and parasympathetic nervous systems by multisignal analysis of cardiorespiratory variability.

    Science.gov (United States)

    Chen, Xiaoxiao; Mukkamala, Ramakrishna

    2008-01-01

    Heart rate (HR) power spectral indexes are limited as measures of the cardiac autonomic nervous systems (CANS) in that they neither offer an effective marker of the beta-sympathetic nervous system (SNS) due to its overlap with the parasympathetic nervous system (PNS) in the low-frequency (LF) band nor afford specific measures of the CANS due to input contributions to HR [e.g., arterial blood pressure (ABP) and instantaneous lung volume (ILV)]. We derived new PNS and SNS indexes by multisignal analysis of cardiorespiratory variability. The basic idea was to identify the autonomically mediated transfer functions relating fluctuations in ILV to HR (ILV-->HR) and fluctuations in ABP to HR (ABP-->HR) so as to eliminate the input contributions to HR and then separate each estimated transfer function in the time domain into PNS and SNS indexes using physiological knowledge. We evaluated these indexes with respect to selective pharmacological autonomic nervous blockade in 14 humans. Our results showed that the PNS index derived from the ABP-->HR transfer function was correctly decreased after vagal and double (vagal + beta-sympathetic) blockade (P < 0.01) and did not change after beta-sympathetic blockade, whereas the SNS index derived from the same transfer function was correctly reduced after beta-sympathetic blockade in the standing posture and double blockade (P < 0.05) and remained the same after vagal blockade. However, this SNS index did not significantly decrease after beta-sympathetic blockade in the supine posture. Overall, these predictions were better than those provided by the traditional high-frequency (HF) power, LF-to-HF ratio, and normalized LF power of HR variability.

  19. Heart rate complexity and cardiac sympathetic dysinnervation in patients with type 2 diabetes mellitus.

    Science.gov (United States)

    Baumert, Mathias; Sacre, Julian W

    2013-01-01

    Cardiovascular autonomic neuropathy (CAN) is one of the most severe complications of type 2 diabetes mellitus (T2DM). The aim of this study was to investigate associations of cardiac sympathetic dysinnervation (CSD; by (123)I-MIBG scintigraphy) with short-term heart rate variability (HRV) measured by traditional vs. complexity markers. ECG was measured in 31 diabetic patients during rest over a period of 5 minutes and HRV quantified in different domains (time and frequency domain, scaling properties, symbolic dynamics). (123)I-MIBG scintigraphy identified 16 patients with CSD. Resting heart rate was increased and HRV reduced in these patients. In a subgroup of 16 patients ECG was also measured during standing. Changes in several HRV measures upon standing demonstrated cardiac responsiveness to orthostatic stress. Strong correlations between HRV, measured during standing, and CSD were observed with metrics based on symbolic dynamics. In conclusion, HRV assessment during standing may be useful for assessing cardiac sympathetic dysinnervation in patients with type 2 diabetes mellitus.

  20. Targeted NGF siRNA delivery attenuates sympathetic nerve sprouting and deteriorates cardiac dysfunction in rats with myocardial infarction.

    Directory of Open Access Journals (Sweden)

    Hesheng Hu

    Full Text Available Nerve growth factor (NGF is involved in nerve sprouting, hyper-innervation, angiogenesis, anti-apoptosis, and preservation of cardiac function after myocardial infarction (MI. Positively modulating NGF expression may represent a novel pharmacological strategy to improve post-infarction prognosis. In this study, lentivirus encoding NGF short interfering RNA (siRNA was prepared, and MI was modeled in the rat using left anterior descending coronary artery ligation. Rats were randomly grouped to receive intramyocardial injection of lentiviral solution containing NGF-siRNA (n = 19, MI-SiNGF group, lentiviral solution containing empty vector (n = 18, MI-GFP group or 0.9% NaCl solution (n = 18, MI-control group, or to receive thoracotomy and pericardiotomy (n = 17, sham-operated group. At 1, 2, 4, and 8 wk after transduction, rats in the MI-control group had higher levels of NGF mRNA and protein than those in the sham-operated group, rats in the MI-GFP group showed similar levels as the MI-control group, and rats in the MI-SiNGF group had lower levels compared to the MI-GFP group, indicating that MI model was successfully established and NGF siRNA effectively inhibited the expression of NGF. At 8 wk, echocardiographic and hemodynamic studies revealed a more severe cardiac dysfunction in the MI-siRNA group compared to the MI-GFP group. Moreover, rats in the MI-siRNA group had lower mRNA and protein expression levels of tyrosine hydroxylase (TH and growth-associated protein 43-positive nerve fibers (GAP-43 at both the infarcted border and within the non-infarcted left ventricles (LV. NGF silencing also reduced the vascular endothelial growth factor (VEGF expression and decreased the arteriolar and capillary densities at the infarcted border compared to the MI-GFP group. Histological analysis indicated a large infarcted size in the MI-SiNGF group. These findings suggested that endogenous NGF silencing attenuated sympathetic nerve sprouting

  1. Role of left cardiac sympathetic denervation in the management of congenital long QT syndrome.

    Directory of Open Access Journals (Sweden)

    Wang L

    2003-01-01

    Full Text Available Congenital long QT syndrome (LQTS is a rare but life-threatening disorder affecting cardiac electrophysiology. It occurs due to mutation in genes encoding for the ion channels in ventricular cell membrane. Syncopal attacks and cardiac arrest are the main symptoms of the disease. Anti-adrenergic therapy with oral beta-blockers has been the mainstay of treatment for LQTS. However, up to 30% of patients fail to respond to medical therapy and remain symptomatic. An alarming 10% of patients still experience cardiac arrest or sudden cardiac death during the course of therapy. Left cardiac sympathetic denervation (LCSD has been used as an alternative therapy in patients who are resistant to beta-blockers. Although LCSD appears effective in reducing the frequency of syncopal attacks and improving the survival rate in both the short and long-term, its use has not gained popularity. The recent advent of minimally invasive thoracoscopic sympathectomy may improve the acceptance of LCSD by physicians and patients in the future. The primary objective of this article was to review the current evidence of the clinical efficacy and safety of LCSD in the management of LQTS. The review was based on Medline search of articles published between 1966 and 2002.

  2. Age-related changes in the sympathetic innervation of cerebral vessels and in carotid vascular responses to norepinephrine in the rat: in vitro and in vivo studies.

    Science.gov (United States)

    Omar, Nisreen Mansour; Marshall, Janice M

    2010-08-01

    We hypothesized that the density of sympathetic noradrenergic innervation of cerebral arteries and vasoconstrictor responses evoked in carotid circulation by norepinephrine (NE) increase with maturation and age. In rats of 4-5, 10-12, and 42-44 wk of age (juvenile, mature, middle aged), glyoxylic acid applied to stretch preparations showed the density of noradrenergic nerves in basilar and middle cerebral arteries was greater in mature than juvenile or middle-aged rats. In anesthetized rats, infusion of NE (2.5 mug/kg iv) increased mean arterial pressure (ABP) to approximately 180 mmHg in mature and middle-aged but to only approximately 150 mmHg in juveniles rats. Concomitantly, carotid blood flow (CBF) decreased in mature and middle-aged rats but remained constant in juveniles because carotid vascular conductance (CVC) decreased more in mature and middle-aged than juvenile rats. We also hypothesized that nitric oxide (NO) blunts cerebral vasoconstrictor responses to NE. Inhibition of NO synthase with l-NAME (10 mg/kg iv) induced similar increases in baseline ABP in each group, but larger decreases in CVC and CBF in mature and middle-aged than juvenile rats. Thereafter, the NE-evoked increase in ABP was similar in juvenile and mature but accentuated in middle-aged rats. Concomitantly, NE decreased CVC in juvenile and mature, but not middle-aged rats; in them, CBF increased. Thus, in juvenile rats, sparse noradrenergic innervation of cerebral arteries is associated with weak NE-evoked pressor responses and weak carotid vasoconstriction that allows autoregulation of CBF. Cerebral artery innervation density increases with maturation but lessens by middle age. Meanwhile, NE-evoked pressor responses and carotid vasoconstriction are stronger in mature and middle-aged rats, such that CBF falls despite the evoked increase in ABP. We propose that in juvenile and mature rats, NO does not modulate NE-evoked pressor responses, cerebral vasoconstriction, or CBF autoregulation

  3. Renal sympathetic denervation prevents the development of pulmonary arterial hypertension and cardiac dysfunction in dogs.

    Science.gov (United States)

    Hu, Wei; Yu, Sheng-Bo; Chen, Liao; Guo, Rui-Qiang; Zhao, Qing-Yan

    2015-08-01

    The renin-angiotensin-aldosterone system is activated in pulmonary arterial hypertension (PAH) patients, and this activation may have long-term negative effects on the progression of PAH. The purpose of this study was to evaluate the effects of transcatheter renal sympathetic denervation (RSD) on the development of pulmonary arterial hypertension and cardiac dysfunction in dogs using two-dimensional speckle tracking imaging. Twenty-two dogs were randomly divided into three groups: control group (n = 7), PAH group (n = 8), and PAH + RSD group (n = 7). All dogs were assessed using two-dimensional speckle tracking imaging. The ventricular strain, ventricular synchrony, left ventricular (LV) twist, and torsion rate were analyzed to evaluate cardiac function. After 8 weeks, the right ventricular lateral longitudinal strain and the septum longitudinal strain were reduced in the PAH group compared with the control group (p dogs.

  4. Decompensated liver cirrhosis and neural regulation of mesenteric vascular tone in rats: role of sympathetic, nitrergic and sensory innervations

    Science.gov (United States)

    Sastre, Esther; Caracuel, Laura; Prieto, Isabel; Llévenes, Pablo; Aller, M. Ángeles; Arias, Jaime; Balfagón, Gloria; Blanco-Rivero, Javier

    2016-01-01

    We evaluated the possible alterations produced by liver cholestasis (LC), a model of decompensated liver cirrhosis in sympathetic, sensory and nitrergic nerve function in rat superior mesenteric arteries (SMA). The vasoconstrictor response to electrical field stimulation (EFS) was greater in LC animals. Alpha-adrenoceptor antagonist phentolamine and P2 purinoceptor antagonist suramin decreased this response in LC animals more than in control animals. Both non-specific nitric oxide synthase (NOS) L-NAME and calcitonin gene related peptide (CGRP) (8-37) increased the vasoconstrictor response to EFS more strongly in LC than in control segments. Vasomotor responses to noradrenaline (NA) or CGRP were greater in LC segments, while NO analogue DEA-NO induced a similar vasodilation in both experimental groups. The release of NA was not modified, while those of ATP, nitrite and CGRP were increased in segments from LC. Alpha 1 adrenoceptor, Rho kinase (ROCK) 1 and 2 and total myosin phosphatase (MYPT) expressions were not modified, while alpha 2B adrenoceptor, nNOS expression and nNOS and MYPT phosphorylation were increased by LC. Together, these alterations might counteract the increased splanchnic vasodilation observed in the last phases of decompensated liver cirrhosis. PMID:27484028

  5. Localization of peripheral autonomic neurons innervating the boar urinary bladder trigone and neurochemical features of the sympathetic component

    Directory of Open Access Journals (Sweden)

    L. Ragionieri

    2013-05-01

    Full Text Available The urinary bladder trigone (UBT is a limited area through which the majority of vessels and nerve fibers penetrate into the urinary bladder and where nerve fibers and intramural neurons are more concentrated. We localized the extramural post-ganglionic autonomic neurons supplying the porcine UBT by means of retrograde tracing (Fast Blue, FB. Moreover, we investigated the phenotype of sympathetic trunk ganglion (STG and caudal mesenteric ganglion (CMG neurons positive to FB (FB+ by coupling retrograde tracing and double-labeling immunofluorescence methods. A mean number of 1845.1±259.3 FB+ neurons were localized bilaterally in the L1-S3 STG, which appeared as small pericarya (465.6±82.7 µm2 mainly localized along an edge of the ganglion. A large number (4287.5±1450.6 of small (476.1±103.9 µm2 FB+ neurons were localized mainly along a border of both CMG. The largest number (4793.3±1990.8 of FB+ neurons was observed in the pelvic plexus (PP, where labeled neurons were often clustered within different microganglia and had smaller soma cross-sectional area (374.9±85.4 µm2. STG and CMG FB+ neurons were immunoreactive (IR for tyrosine hydroxylase (TH (66±10.1% and 52.7±8.2%, respectively, dopamine beta-hydroxylase (DβH (62±6.2% and 52±6.2%, respectively, neuropeptide Y (NPY (59±8.2% and 65.8±7.3%, respectively, calcitonin-gene-related peptide (CGRP (24.1±3.3% and 22.1±3.3%, respectively, substance P (SP (21.6±2.4% and 37.7±7.5%, respectively, vasoactive intestinal polypeptide (VIP (18.9±2.3% and 35.4±4.4%, respectively, neuronal nitric oxide synthase (nNOS (15.3±2% and 32.9±7.7%, respectively, vesicular acetylcholine transporter (VAChT (15±2% and 34.7±4.5%, respectively, leu-enkephalin (LENK (14.3±7.1% and 25.9±8.9%, respectively, and somatostatin (SOM (12.4±3% and 31.8±7.3%, respectively. UBT-projecting neurons were also surrounded by VAChT-, CGRP-, LENK-, and nNOS-IR fibers. The possible role of these neurons and fibers

  6. Norepinephrine transporter (NET) is expressed in cardiac sympathetic ganglia of adult rat

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The sympathetic nervous system plays a cardinal role in regulating cardiac function through releasing the neurotransmitter norepinephrine (NE). In comparison with central nervous system, the molecular mechanism of NE uptake in myocardium is not clear. In present study, we proved that in rat the CNS type of NE transporter (NET) was also expressed in middle cervical-stellate ganglion complex (MC-SG complex) which is considered to control the activity of heart, but not expressed in myocardium. The results also showed that NET expression level in right ganglion was significantly higher than in the left, rendering the greater capacity of NE uptake in right ventricle, a fact which may contribute to the maintenance of right ventricular function under pathologic state.

  7. Polycystic Ovary Syndrome Presents Higher Sympathetic Cardiac Autonomic Modulation that is not altered by Strength Training

    Science.gov (United States)

    RIBEIRO, VICTOR B.; KOGURE, GISLAINE S.; REIS, ROSANA M.; GASTALDI, ADA C.; DE ARAÚJO, JOÃO E.; MAZON, JOSÉ H.; BORGHI, AUDREY; SOUZA, HUGO C.D.

    2016-01-01

    Polycystic ovary syndrome (PCOS) may present important comorbidities, such as cardiovascular and metabolic diseases, which are often preceded by changes in cardiac autonomic modulation. Different types of physical exercises are frequently indicated for the prevention and treatment of PCOS. However, little is known about the effects of strength training on the metabolic, hormonal, and cardiac autonomic parameters. Therefore, our aim was to investigate the effects of strength training on the autonomic modulation of heart rate variability (HRV) and its relation to endocrine-metabolic parameters in women with PCOS. Fifty-three women were divided into two groups: CONTROL (n=26) and PCOS (n=27). The strength training lasted 4 months, which was divided into mesocycles of 4 weeks each. The training load started with 70% of one repetition maximum (1RM). Blood samples were collected before and after intervention for analysis of fasting insulin and glucose, HOMA-IR, testosterone, androstenedione and testosterone/androstenedione (T/A) ratio. Spectral analysis of HRV was performed to assess cardiac autonomic modulation indexes. The PCOS group presented higher insulin and testosterone levels, T/A ratio, along with increased sympathetic cardiac autonomic modulation before intervention. The training protocol used did not cause any change of endocrine-metabolic parameters in the CONTROL group. Interestingly, in the PCOS group, reduced testosterone levels and T/A ratio. Additionally, strength training did not have an effect on the spectral parameter values of HRV obtained in both groups. Strength training was not able to alter HRV autonomic modulation in women with PCOS, however may reduce testosterone levels and T/A ratio. PMID:27990221

  8. Cardiac sympathetic denervation in familial amyloid polyneuropathy assessed by iodine-123 metaiodobenzylguanidine scintigraphy and heart rate variability

    Energy Technology Data Exchange (ETDEWEB)

    Delahaye, N.; Le Guludec, D. [Department of Nuclear Medicine, Bichat Hospital, Paris (France); Dinanian, S.; Slama, M.S. [Department of Cardiology, A. Beclere Hospital, Paris (France); Mzabi, H.; Samuel, D. [Department of Hepatic Surgery, P. Brousse Hospital, Paris (France); Adams, D. [Department of Neurology, Bicetre Hospital, Paris (France); Merlet, P. [SHFJ, DSV-CEA, Orsay (France)

    1999-04-29

    Familial amyloid polyneuropathy (FAP) is a rare and severe hereditary form of amyloidosis, due to nervous deposits of a genetic variant transthyretin produced by the liver and characterized by both sensorimotor and autonomic neuropathy. Left ventricular systolic dysfunction is rare, but conduction disturbances and sudden deaths can occur. The neurological status of the heart has not been elucidated, and an alteration of the sympathetic nerves may be involved. We studied 17 patients (42{+-}12 years) before liver transplantation by iodine-123 metaiodobenzylguanidine (MIBG) scintigraphy, heart rate variability analysis, coronary angiography, radionuclide ventriculography, rest thallium single-photon emission tomography (SPET) and echocardiography. Coronary arteries, left ventricular systolic function and rest thallium SPET were normal in all patients. Only mild evidence of amyloid infiltration was found at echocardiographic examination. Cardiac MIBG uptake was dramatically decreased in patients compared with age-matched control subjects (heart-to-mediastinum activity ratio at 4 h: 1.36{+-}0.26 versus 1.98{+-}0.35, P<0.001), while there was no difference in MIBG washout rate. Heart rate variability analysis showed a considerable scatter of values, with high values in four patients despite cardiac sympathetic denervation as assessed by MIBG imaging. The clinical severity of the polyneuropathy correlated with MIBG uptake at 4 h but not with the heart rate variability indices. Cardiac MIBG uptake and the heart rate variability indices did not differ according to the presence or absence of conduction disturbances. Patients with FAP have sympathetic cardiac denervation as assessed by MIBG imaging despite a preserved left ventricular systolic function and cardiac perfusion, without correlation with conduction disturbances. Results of the heart rate variability analysis were more variable and this technique does not seem to be the best way to evaluate the extent of cardiac

  9. In vivo demonstration of H3-histaminergic inhibition of cardiac sympathetic stimulation by R-α-methyl-histamine and its prodrug BP 2.94 in the dog

    OpenAIRE

    Mazenot, Catherine; Ribuot, Christophe; Durand, Andrée; Joulin, Yves; Demenge, Pierre; Godin-Ribuot, Diane

    1999-01-01

    The aim of this study was to investigate whether histamine H3-receptor agonists could inhibit the effects of cardiac sympathetic nerve stimulation in the dog.Catecholamine release by the heart and the associated variation of haemodynamic parameters were measured after electrical stimulation of the right cardiac sympathetic nerves (1–4 Hz, 10 V, 10 ms) in the anaesthetized dog treated with R-α-methyl-histamine (R-HA) and its prodrug BP 2.94 (BP).Cardiac sympathetic stimulation induced a noradr...

  10. Effects of renal sympathetic denervation on post-myocardial infarction cardiac remodeling in rats.

    Directory of Open Access Journals (Sweden)

    Jialu Hu

    Full Text Available OBJECTIVE: To investigate the therapeutic effects of renal denervation (RD on post- myocardial infarction (MI cardiac remodeling in rats, the most optimal time for intervention and the sustainability of these effects. METHODS: One hundred SPF male Wistar rats were randomly assigned to N group (Normal, n=10, MI group(MI, n=20,RD group (RD, n=10, RD3+MI (MI three days after RD, n=20, MI1+RD (RD one day after MI, n=20, MI7+RD (RD seven days after MI, n=20. MI was produced through thoracotomic ligation of the anterior descending artery. RD was performed through laparotomic stripping of the renal arteriovenous adventitial sympathetic nerve. Left ventricular function, hemodynamics, plasma BNP, urine volume, urine sodium excretion and other indicators were measured four weeks after MI. RESULTS: (1 The left ventricular function of the MI group significantly declined (EF<40%, plasma BNP was elevated, urine output was significantly reduced, and 24-hour urine sodium excretion was significantly reduced. (2 Denervation can be achieved by surgically stripping the arteriovenous adventitia, approximately 3 mm from the abdominal aorta. (3 In rats with RD3+MI, MI1+RD and MI7+RD, compared with MI rats respectively, the LVEF was significantly improved (75 ± 8.4%,69 ± 3.8%,73 ± 5.5%, hemodynamic indicators were significantly improved, plasma BNP was significantly decreased, and the urine output was significantly increased (21.3 ± 5 ml,23.8 ± 5.4 ml,25.2 ± 8.7 ml. However, the urinary sodium excretion also increased but without significant difference. CONCLUSIONS: RD has preventive and therapeutic effects on post-MI cardiac remodeling.These effects can be sustained for at least four weeks, but there were no significant differences between denervation procedures performed at different times in the course of illness. Cardiac function, hemodynamics, urine volume and urine sodium excretion in normal rats were not affected by RD.

  11. Assessment of cardiac sympathetic nerve abnormalities by {sup 123}I-MIBG (metaiodobenzylguanidine) myocardial scintigraphy in diabetic patients undergoing hemodialysis

    Energy Technology Data Exchange (ETDEWEB)

    Ohashi, Hiroshige; Oda, Hiroshi; Matsuno, Yukihiko [Prefectural Gifu Hospital (Japan)] [and others

    1995-05-01

    We compared cardiac sympathetic nerve abnormalities in patients hemodialyzed because of diabetic nephropathy (DN, n=18) and chronic glomerulonephritis (CGN, n=21). {sup 123}I-metaiodobenzylguanidine (MIBG) myocardial scintigraphy was performed in this study. SPECT and anterior planar myocardial images were obtained 15 minutes after (initial images) and 4 hours after (delayed images) an injection of MIBG. The following results were obtained: (1) SPECT showed more defects in DN than in CGN. (2) The heart to superior mediastinum uptake ratio (H/M) was lower in DN than in CGN. These findings suggest that myocardial uptake of MIBG in DN is significantly impaired because of cardiac sympathetic nerve abnormalities. These abnormalities may affect the prognosis in DN. (author).

  12. Prognostic value of coronary anatomy and myocardial innervation imaging in cardiac disease

    NARCIS (Netherlands)

    Veltman, Caroline Emma

    2016-01-01

    Over the last decade, there has been an exponential development in cardiac imaging technology. Currently, cardiac imaging plays a central role in clinical management and decision making in the diverse and growing population of patients encountered in daily cardiology practice. Important outcome-rela

  13. Effects of alpha-adrenoceptor and of combined sympathetic and parasympathetic blockade on cardiac performance and vascular resistance

    DEFF Research Database (Denmark)

    Kelbaek, H; Frandsen, Henrik Lund; Hilsted, J

    1992-01-01

    1. Cardiac performance and vascular resistance was studied in seven healthy men by radionuclide cardiography and venous plethysmography before and after alpha-adrenoceptor blockade with phentolamine and after combined alpha-adrenoceptor, beta-adrenoceptor (propranolol) and parasympathetic (atropine...... propranolol and atropine were added. 3. These results indicate that peripheral vasoconstriction especially that exerted by alpha-adrenoceptor nervous tone in skeletal muscle restricts left ventricular emptying of the intact heart. During pharmacologic blockade of the sympathetic and parasympathetic nervous...

  14. Clinical usefulness of {sup 123}I-metaiodobenzylguanidine myocardial scintigraphy in diabetic patients with cardiac sympathetic nerve dysfunction

    Energy Technology Data Exchange (ETDEWEB)

    Miyanaga, Hajime; Yoneyama, Satoshi; Kamitani, Tadaaki; Kawasaki, Shingo; Takahashi, Toru; Kunishige, Hiroshi [Matsushita Memorial Hospital, Osaka (Japan)

    1995-09-01

    To assess the clinical utility of {sup 123}I-metaiodobenzylguanidine (MIBG) scintigraphy in evaluating cardiac sympathetic nerve disturbance in diabetic patients, we performed MIBG scintigraphy in 18 diabetic patients and 11 normal controls. Diabetic patients with symptomatic neuropathy (DM2) had a significantly lower heart to mediastinum uptake ratio than did those without neuropathy or normal controls in initial and delayed images (initial image, 1.90{+-}0.27 vs 2.32{+-}0.38, 2.41{+-}0.40, p<0.01; delayed image, 1.80{+-}0.31 vs 2.48{+-}0.35, 2.56{+-}0.28, p<001, respectively). Defect score, assessed visually, were higher in DM2 patients than in patients in the other two groups (initial image, 7{+-}2.6 vs 1.5{+-}1.9, 0.7{+-}0.9; delayed image 10.6{+-}3.3 vs 4.0{+-}2.5, 1.7{+-}1.6 p<0.01, respectively). The maximum washout rate in DM2 patients was also higher than those in patients in the other two groups. The findings of these indices obtained from MIBG scintigraphy coincided with the % low-frequency power extracted from heart rate fluctuations using a power spectral analysis and the results of the Schellong test, which were used to evaluate sympathetic function. These results suggest that MIBG scintigraphy may be useful for evaluating cardiac sympathetic nerve disturbance in patients with diabetes. (author).

  15. Effects of Antidepressants, but not Psychopathology, on Cardiac Sympathetic Control : A Longitudinal Study

    NARCIS (Netherlands)

    Licht, Carmilla M. M.; Penninx, Brenda W. J. H.; de Geus, Eco J. C.

    2012-01-01

    Increased sympathetic activity has been hypothesized to have a role in the elevated somatic disease risk in persons with depressive or anxiety disorders. However, it remains unclear whether increased sympathetic activity reflects a direct effect of anxiety or depression or an indirect effect of anti

  16. Interaction between cardiac sympathetic afferent reflex and chemoreflex is mediated by the NTS AT1 receptors in heart failure.

    Science.gov (United States)

    Wang, Wei-Zhong; Gao, Lie; Wang, Han-Jun; Zucker, Irving H; Wang, Wei

    2008-09-01

    Several sympathoexcitatory reflexes, such as the cardiac sympathetic afferent reflex (CSAR) and arterial chemoreflex, are significantly augmented and contribute to elevated sympathetic outflow in chronic heart failure (CHF). This study was undertaken to investigate the interaction between the CSAR and the chemoreflex in CHF and to further identify the involvement of angiotensin II type 1 receptors (AT1Rs) in the nucleus of the tractus solitarius (NTS) in this interaction. CHF was induced in rats by coronary ligation. Acute experiments were performed in anesthetized rats. The chemoreflex-induced increase in cardiovascular responses was significantly greater in CHF than in sham-operated rats after either chemical or electrical activation of the CSAR. The inhibition of the CSAR by epicardial lidocaine reduced the chemoreflex-induced effects in CHF rats but not in sham-operated rats. Bilateral NTS injection of the AT1R antagonist losartan (10 and 100 pmol) dose-dependently decreased basal sympathetic nerve activity in CHF but not in sham-operated rats. This procedure also abolished the CSAR-induced enhancement of the chemoreflex. The discharge and chemosensitivity of NTS chemosensitive neurons were significantly increased following the stimulation of the CSAR in sham-operated and CHF rats, whereas CSAR inhibition by epicardial lidocaine significantly attenuated chemosensitivity of NTS neurons in CHF but not in sham-operated rats. Finally, the protein expression of AT1R in the NTS was significantly higher in CHF than in sham-operated rats. These results demonstrate that the enhanced cardiac sympathetic afferent input contributes to an excitatory effect of chemoreflex function in CHF, which is mediated by an NTS-AT1R-dependent mechanism.

  17. Cardiac sympathetic activity in chronic heart failure: cardiac (123)I-mIBG scintigraphy to improve patient selection for ICD implantation.

    Science.gov (United States)

    Verschure, D O; van Eck-Smit, B L F; Somsen, G A; Knol, R J J; Verberne, H J

    2016-12-01

    Heart failure is a life-threatening disease with a growing incidence in the Netherlands. This growing incidence is related to increased life expectancy, improvement of survival after myocardial infarction and better treatment options for heart failure. As a consequence, the costs related to heart failure care will increase. Despite huge improvements in treatment, the prognosis remains unfavourable with high one-year mortality rates. The introduction of implantable devices such as implantable cardioverter defibrillators (ICD) and cardiac resynchronisation therapy (CRT) has improved the overall survival of patients with chronic heart failure. However, after ICD implantation for primary prevention in heart failure a high percentage of patients never have appropriate ICD discharges. In addition 25-50 % of CRT patients have no therapeutic effect. Moreover, both ICDs and CRTs are associated with malfunction and complications (e. g. inappropriate shocks, infection). Last but not least is the relatively high cost of these devices. Therefore, it is essential, not only from a clinical but also from a socioeconomic point of view, to optimise the current selection criteria for ICD and CRT. This review focusses on the role of cardiac sympathetic hyperactivity in optimising ICD selection criteria. Cardiac sympathetic hyperactivity is related to fatal arrhythmias and can be non-invasively assessed with (123)I-meta-iodobenzylguanide ((123)I-mIBG) scintigraphy. We conclude that cardiac sympathetic activity assessed with (123)I-mIBG scintigraphy is a promising tool to better identify patients who will benefit from ICD implantation.

  18. The low frequency power of heart rate variability is neither a measure of cardiac sympathetic tone nor of baroreflex sensitivity.

    Science.gov (United States)

    Martelli, Davide; Silvani, Alessandro; McAllen, Robin M; May, Clive N; Ramchandra, Rohit

    2014-10-01

    The lack of noninvasive approaches to measure cardiac sympathetic nerve activity (CSNA) has driven the development of indirect estimates such as the low-frequency (LF) power of heart rate variability (HRV). Recently, it has been suggested that LF HRV can be used to estimate the baroreflex modulation of heart period (HP) rather than cardiac sympathetic tone. To test this hypothesis, we measured CSNA, HP, blood pressure (BP), and baroreflex sensitivity (BRS) of HP, estimated with the modified Oxford technique, in conscious sheep with pacing-induced heart failure and in healthy control sheep. We found that CSNA was higher and systolic BP and HP were lower in sheep with heart failure than in control sheep. Cross-correlation analysis showed that in each group, the beat-to-beat changes in HP correlated with those in CSNA and in BP, but LF HRV did not correlate significantly with either CSNA or BRS. However, when control sheep and sheep with heart failure were considered together, CSNA correlated negatively with HP and BRS. There was also a negative correlation between CSNA and BRS in control sheep when considered alone. In conclusion, we demonstrate that in conscious sheep, LF HRV is neither a robust index of CSNA nor of BRS and is outperformed by HP and BRS in tracking CSNA. These results do not support the use of LF HRV as a noninvasive estimate of either CSNA or baroreflex function, but they highlight a link between CSNA and BRS.

  19. Assessment of cardiac sympathetic nerve activity in children with chronic heart failure using quantitative iodine-123 metaiodobenzylguanidine imaging

    Energy Technology Data Exchange (ETDEWEB)

    Karasawa, Kensuke; Ayusawa, Mamoru; Noto, Nobutaka; Sumitomo, Naokata; Okada, Tomoo; Harada, Kensuke [Nihon Univ., Tokyo (Japan). School of Medicine

    2000-12-01

    Cardiac sympathetic nerve activity in children with chronic heart failure was examined by quantitative iodine-123 metaiodobenzylguanidine (MIBG) myocardial imaging in 33 patients aged 7.5{+-}6.1 years (range 0-18 years), including 8 with cardiomyopathy, 15 with congenital heart disease, 3 with anthracycrine cardiotoxicity, 3 with myocarditis, 3 with primary pulmonary hypertension and 1 with Pompe's disease. Anterior planar images were obtained 15 min and 3 hr after the injection of iodine-123 MIBG. The cardiac iodine-123 MIBG uptake was assessed as the heart to upper mediastinum uptake activity ratio of the delayed image (H/M) and the cardiac percentage washout rate (%WR). The severity of chronic heart failure was class I (no medication) in 8 patients, class II (no symptom with medication) in 9, class III (symptom even with medication) in 10 and class IV (late cardiac death) in 6. H/M was 2.33{+-}0.22 in chronic heart failure class I, 2.50{+-}0.34 in class II, 1.95{+-}0.61 in class III, and 1.39{+-}0.29 in class IV (p<0.05). %WR was 24.8{+-}12.8% in chronic heart failure class I, 23.3{+-}10.2% in class II, 49.2{+-}24.5% in class III, and 66.3{+-}26.5% in class IV (p<0.05). The low H/M and high %WR were proportionate to the severity of chronic heart failure. Cardiac iodine-123 MIBG showed cardiac adrenergic neuronal dysfunction in children with severe chronic heart failure. Quantitative iodine-123 MIBG myocardial imaging is clinically useful as a predictor of therapeutic outcome and mortality in children with chronic heart failure. (author)

  20. An electrophysiologist perspective on risk stratification in heart failure: can better understanding of the condition of the cardiac sympathetic nervous system help?

    Science.gov (United States)

    Borgquist, Rasmus; Singh, Jagmeet P

    2015-06-01

    Heart failure is often complicated by arrhythmias that can adversely affect the quality of life and increase the risk for sudden cardiac death. Current risk stratification strategies for sudden cardiac death in the heart failure patient are not ideal, with much potential for further refinement. Overactivation of the sympathetic nervous system has been shown to be associated with worsening heart failure as well as arrhythmic events. Recent advances in our understanding of the autonomic nervous system and new methods for quantification of the pathologic activation of the sympathetic nerves have triggered increasing interest in this field. This viewpoint focuses on the need for and challenges of risk stratification of sudden death in the heart failure patient and discusses the potential value of measuring sympathetic nervous system activity to better stratify risk and to select patients with heart failure for implantable cardioverter defibrillator therapy.

  1. Scintigraphic assessment of regional cardiac sympathetic nervous system in patients with single-vessel coronary artery disease

    Energy Technology Data Exchange (ETDEWEB)

    Sakata, Kazuyuki; Yoshida, Hiroshi; Nawada, Ryuzo; Obayashi, Kazuhiko; Tamekiyo, Hiromichi; Mochizuki, Mamoru [Shizuoka General Hospital (Japan)

    2000-06-01

    In coronary artery disease, the cardiac sympathetic nervous system is closely associated with myocardial ischemia. I-123 metaiodobenzylguanidine (MIBG) imaging allows us to assess the cardiac sympathetic nervous system regionally. One-hundred and eleven patients with single-vessel disease underwent regional quantitative analysis of MIBG imaging before successful percutaneous transluminal coronary angioplasty (PTCA), and repeat angiography 6 months after PTCA. Based on the results of the follow-up left ventriculogram, patients were divided into 3 groups: 39 angina pectoris (AP), 48 prior myocardial infarction without asynergy (MI without asynergy) and 24 prior myocardial infarction with asynergy (Ml with asynergy). AP and MI without asynergy had significant correlations between uptake parameters and regional washout in the territory of diseased vessels, among which the severity score in AP was the most closely correlated with regional washout (r=0.79, p<0.0001). These correlations disappeared in MI with asynergy. To compare regional MIBG parameters in the territory of the diseased vessel as well as in the territories of the other major coronary arteries among the 3 groups, we examined MIBG parameters in 57 patients with left anterior descending artery (LAD) disease selected from among the study patients. Regional washout in the territory of the LAD was significantly higher in the MI without asynergy group than in the other two groups. The left circumflex artery (LCX) region showed significantly reduced MlBG uptake and an increased extent score in the MI with asynergy group compared with the AP group, although only a difference in the extent score existed between the MI with asynergy group and the AP group in the right coronary artery (RCA) region. In addition, the global ejection fraction before PTCA showed a significant negative correlation with each regional washout rate. In this way, regional quantitative analysis of MIBG imaging can detect the regional

  2. Disruption of cardiac cholinergic neurons enhances susceptibility to ventricular arrhythmias

    Science.gov (United States)

    Jungen, Christiane; Scherschel, Katharina; Eickholt, Christian; Kuklik, Pawel; Klatt, Niklas; Bork, Nadja; Salzbrunn, Tim; Alken, Fares; Angendohr, Stephan; Klene, Christiane; Mester, Janos; Klöcker, Nikolaj; Veldkamp, Marieke W.; Schumacher, Udo; Willems, Stephan; Nikolaev, Viacheslav O.; Meyer, Christian

    2017-01-01

    The parasympathetic nervous system plays an important role in the pathophysiology of atrial fibrillation. Catheter ablation, a minimally invasive procedure deactivating abnormal firing cardiac tissue, is increasingly becoming the therapy of choice for atrial fibrillation. This is inevitably associated with the obliteration of cardiac cholinergic neurons. However, the impact on ventricular electrophysiology is unclear. Here we show that cardiac cholinergic neurons modulate ventricular electrophysiology. Mechanical disruption or pharmacological blockade of parasympathetic innervation shortens ventricular refractory periods, increases the incidence of ventricular arrhythmia and decreases ventricular cAMP levels in murine hearts. Immunohistochemistry confirmed ventricular cholinergic innervation, revealing parasympathetic fibres running from the atria to the ventricles parallel to sympathetic fibres. In humans, catheter ablation of atrial fibrillation, which is accompanied by accidental parasympathetic and concomitant sympathetic denervation, raises the burden of premature ventricular complexes. In summary, our results demonstrate an influence of cardiac cholinergic neurons on the regulation of ventricular function and arrhythmogenesis. PMID:28128201

  3. Axon guidance of sympathetic neurons to cardiomyocytes by glial cell line-derived neurotrophic factor (GDNF).

    Science.gov (United States)

    Miwa, Keiko; Lee, Jong-Kook; Takagishi, Yoshiko; Opthof, Tobias; Fu, Xianming; Hirabayashi, Masumi; Watabe, Kazuhiko; Jimbo, Yasuhiko; Kodama, Itsuo; Komuro, Issei

    2013-01-01

    Molecular signaling of cardiac autonomic innervation is an unresolved issue. Here, we show that glial cell line-derived neurotrophic factor (GDNF) promotes cardiac sympathetic innervation in vitro and in vivo. In vitro, ventricular myocytes (VMs) and sympathetic neurons (SNs) isolated from neonatal rat ventricles and superior cervical ganglia were cultured at a close distance. Then, morphological and functional coupling between SNs and VMs was assessed in response to GDNF (10 ng/ml) or nerve growth factor (50 ng/ml). As a result, fractions of neurofilament-M-positive axons and synapsin-I-positive area over the surface of VMs were markedly increased with GDNF by 9-fold and 25-fold, respectively, compared to control without neurotrophic factors. Pre- and post-synaptic stimulation of β1-adrenergic receptors (BAR) with nicotine and noradrenaline, respectively, resulted in an increase of the spontaneous beating rate of VMs co-cultured with SNs in the presence of GDNF. GDNF overexpressing VMs by adenovirus vector (AdGDNF-VMs) attracted more axons from SNs compared with mock-transfected VMs. In vivo, axon outgrowth toward the denervated myocardium in adult rat hearts after cryoinjury was also enhanced significantly by adenovirus-mediated GDNF overexpression. GDNF acts as a potent chemoattractant for sympathetic innervation of ventricular myocytes, and is a promising molecular target for regulation of cardiac function in diseased hearts.

  4. Axon guidance of sympathetic neurons to cardiomyocytes by glial cell line-derived neurotrophic factor (GDNF.

    Directory of Open Access Journals (Sweden)

    Keiko Miwa

    Full Text Available Molecular signaling of cardiac autonomic innervation is an unresolved issue. Here, we show that glial cell line-derived neurotrophic factor (GDNF promotes cardiac sympathetic innervation in vitro and in vivo. In vitro, ventricular myocytes (VMs and sympathetic neurons (SNs isolated from neonatal rat ventricles and superior cervical ganglia were cultured at a close distance. Then, morphological and functional coupling between SNs and VMs was assessed in response to GDNF (10 ng/ml or nerve growth factor (50 ng/ml. As a result, fractions of neurofilament-M-positive axons and synapsin-I-positive area over the surface of VMs were markedly increased with GDNF by 9-fold and 25-fold, respectively, compared to control without neurotrophic factors. Pre- and post-synaptic stimulation of β1-adrenergic receptors (BAR with nicotine and noradrenaline, respectively, resulted in an increase of the spontaneous beating rate of VMs co-cultured with SNs in the presence of GDNF. GDNF overexpressing VMs by adenovirus vector (AdGDNF-VMs attracted more axons from SNs compared with mock-transfected VMs. In vivo, axon outgrowth toward the denervated myocardium in adult rat hearts after cryoinjury was also enhanced significantly by adenovirus-mediated GDNF overexpression. GDNF acts as a potent chemoattractant for sympathetic innervation of ventricular myocytes, and is a promising molecular target for regulation of cardiac function in diseased hearts.

  5. Sympathetic innervation loss affects osteogenic chemokine PDGF expression in distraction osteogenesis%失交感神经支配对骨牵张中成骨趋化因子PDGF影响的研究

    Institute of Scientific and Technical Information of China (English)

    刘鹏; 雷德林; 王磊; 杜兆杰; 隋健夫; 张雅博

    2013-01-01

    目的:探究失交感神经支配对大鼠牵张成骨骨痂内趋化因子PDGF表达的影响.方法:雄性SD大鼠18只随机分为对照组和实验组(n=9),对照组行右侧下颌骨牵张成骨术;实验组行右侧下颌骨牵张成骨术及双侧颈交感干离断术.术后分别于固定期1、14、28 d每组取材3只动物进行免疫组织化学染色评价PDGF的表达情况,并运用IPP6.0软件分析骨小梁周围、未成骨区域及血管内皮细胞周围平均吸光度值,所得结果用SPSS 13.0进行两样本t检验.结果:实验组骨小梁周围、未成骨区域PDGF表达量高于对照组(P<0.05),而血管内皮细胞周围PDGF表达量明显低于对照组(P<0.05).结论:在牵张成骨中,PDGF在血管周围和成骨区表达具有时空变化受到交感神经的调控.%Objective: To investigate the effects of sympathetic innervation loss on the expression of chemokine PDGF in bone callus in rat mandibular distraction osteogenesis. Methods: 18 male SD rats were divided into control and experimental groups (re =9) randomly. The rats in control group underwent right mandibular distraction osteogenesis, those in experimental group underwent right mandibular distraction osteogenesis and then bilateral transection of cervical sympathetic trunk. 3 rats were sacrificed at consolidation time of 1,14 and 28th day respectively in each group, and specimens were prepared for immunohistochemical staining of PDGF. IPP6.0 was used for the analysis of average optical density values around trabecular bone and vascular endothelial cells and none ossification area. A two-sample t test was performed using SPSS 13.0 software package. Results: PDGF expression around trabecular bone and none ossification area in experimental group was significantly higher than that in control group (P <0.05) , while PDGF expression around vascular endothelial cells in experimental group was significantly lower than that in control group(P <0. 05). Conclusion

  6. Using Lorenz plot and Cardiac Sympathetic Index of heart rate variability for detecting seizures for patients with epilepsy.

    Science.gov (United States)

    Jeppesen, Jesper; Beniczky, Sandor; Johansen, Peter; Sidenius, Per; Fuglsang-Frederiksen, Anders

    2014-01-01

    Tachycardia is often seen during epileptic seizures, but it also occurs during physical exercise. In order to assess whether focal epileptic seizures can be detected by short term moving window Heart Rate Variability (HRV) analysis, we modified the geometric HRV method, Lorenz plot, to consist of only 30, 50 or 100 R-R intervals per analyzed window. From each window we calculated the longitudinal (L) and transverse (T) variability of Lorenz plot to retrieve the Cardiac Sympathetic Index (CSI) as (L/T) and "Modified CSI" (described in methods), and compared the maximum during the patient's epileptic seizures with that during the patient's own exercise and non-seizure sessions as control. All five analyzed patients had complex partial seizures (CPS) originating in the temporal lobe (11 seizures) during their 1-5 days long term video-EEG monitoring. All CPS with electroencephalographic correlation were selected for the HRV analysis. The CSI and Modified CSI were correspondently calculated after each heart beat depicting the prior 30, 50 and 100 R-R intervals at the time. CSI (30, 50 and 100) and Modified CSI (100) showed a higher maximum peak during seizures than exercise/non-seizure (121-296%) for 4 of the 5 patients within 4 seconds before till 60 seconds after seizure onset time even though exercise maximum HR exceeded that of the seizures. The results indicate a detectable, sudden and inordinate shift towards sympathetic overdrive in the sympathovagal balance of the autonomic nervous system just around seizure-onset for certain patients. This new modified moving window Lorenz plot method seems promising way of constructing a portable ECG-based epilepsy alarm for certain patients with epilepsy who needs aid during seizure.

  7. [Inter-organ neural communications in the innervation of bronchi and pulmonary circulation vessels].

    Science.gov (United States)

    Andriesh, V N

    1987-04-01

    By means of V.P. Vorobiov's preparation in complex of the thoracic cavity organs of persons at various age and sex in fetuses, sources of innervation of bronchi and vessels of the pulmonary circulation have been stated. They make the composition of the cardiac nerves getting off the superior, middle cervical, cervico-thoracic (stellate) and from 3 to 5 thoracic nodes of the sympathetic trunk, superior and inferior cardiac branches of the nervus vagus. Connection between the nerves of the bronchi and vessels of the pulmonary circulation with the cardiac and esophageal nerves and formation of interorganic nervous plexuses are demonstrated. Not always the diaphragmal nerve participates in the innervation of the bronchi and pulmonary vessels. In total preparations and flat sections, elective revealing of the nervous elements with Shiff reagent in M. G. Shubich and A. B. Khodos modification and Gomori thiocholine method, makes it possible to follow connections of the pulmonary veins nerves with the left atrium, intrapulmonary connection of the perivascular and peribronchial plexuses, as well as participation of nervous elements of the pulmonary trunk in innervation of the right ventricle walls. There are multiple vegetative communications participating in innervation of the bronchi and vessels of the pulmonary circulation. The relations of the pulmonary nerves with the nerves of other thoracic organs are very complex; this explains the nature of the repercussive reactions of the lungs after surgical interventions performed in the other organs of the thoracic cavity.

  8. Cardiac spectral power reflects parasympathetic but not sympathetic nervous system activity in a clinical population.

    Science.gov (United States)

    Muth, E R; Morrow, G R; Jiang, W; Stern, R M; Dubeshter, B

    1996-11-06

    The purpose of this short communication is to report our clinical findings regarding the use of the low frequency (LF, 0.02-0.15 Hz) and high frequency (HF, > 0.15 Hz) components of the spectral decomposition of heart-rate as indices of sympathetic (SNS) and parasympathetic nervous system (PNS) activity, respectively. Thirty-two females with histologically confirmed ovarian cancer, ranging in age from 46-72 years, participated in an autonomic assessment protocol consisting of a resting heart rate recording and several ANS function tests. The LF, HF and total power measures from the spectral decomposition were highly correlated with one another. In addition, the spectral components were most highly correlated with measures of PNS activity, i.e. standard deviation of heart rate at rest and the ratio of the six longest to the six shortest R-R intervals during deep breathing (E:I ratio). It is concluded, as other researchers have stated, that the use of the HF component of the HR spectrum as a measure of PNS activity is warranted, but caution must be used when interpreting the LF component.

  9. Effects of Spinal Cord Stimulation on Cardiac Sympathetic Nerve Activity in Patients with Heart Failure

    DEFF Research Database (Denmark)

    Naar, Jan; Jaye, Deborah; Linde, Cecilia

    2017-01-01

    activity in HF patients. Secondary hypotheses were that SCS improves left ventricular function and dimension, exercise capacity, and clinical variables relevant to HF. METHODS: HF patients with a SCS device previously participating in the DEFEAT-HF trial were included in this crossover study with 6-week...... intervention periods (SCS-ON and SCS-OFF). SCS (50 Hz, 210-μs pulse duration, aiming at T2-T4 segments) was delivered for 12 hours daily. Indices of myocardial sympathetic neuronal function (heart-to-mediastinum ratio, HMR) and activity (washout rate, WR) were assessed using (123) I......-metaiodobenzylguanidine (MIBG) scintigraphy. Echocardiography, exercise testing, and clinical data collection were also performed. RESULTS: We included 13 patients (65.3 ± 8.0 years, nine males) and MIBG scintigraphy data were available in 10. HMR was not different comparing SCS-ON (1.37 ± 0.16) and SCS-OFF (1.41 ± 0.21, P = 0...

  10. [The state of sympathetic-adrenal system in patients with chronic cardiac insufficiency].

    Science.gov (United States)

    Nigmatullin, R R; Kirillova, V V; Dzhordzhikiia, R K; Kudrin, V S; Klodt, P M

    2009-01-01

    Activation of sympato-adrenal system plays an important role in the development of chronic cardiac failure (CCF). However, its relation to morpho-functional state of myocardium in CCF patients is virtually unknown. HPLC with electrochemical detection was used to determine plasma noradrenalin, adrenalin, and their precursors, 3,4-dioxyphenylalanine (DOPA) and dopamine, in patients with different morpho-functional changes in myocardium. The study demonstrated enhanced activity of sympato-adrenal system in patients with CCF. It showed for the first time that activity of sympato-adrenal system in CCF patients depends on the morpho-functional status of myocardium.

  11. Role of endothelin-1 in mediating changes in cardiac sympathetic nerve activity in heart failure.

    Science.gov (United States)

    Abukar, Yonis; May, Clive N; Ramchandra, Rohit

    2016-01-01

    Heart failure (HF) is associated with increased sympathetic nerve activity to the heart (CSNA), which is directly linked to mortality in HF patients. Previous studies indicate that HF is associated with high levels of plasma endothelin-1 (ET-1), which correlates with the severity of the disease. We hypothesized that blockade of endothelin receptors would decrease CSNA. The effects of intravenous tezosentan (a nonselective ETA and ETB receptor antagonist) (8 mg·kg(-1)·h(-1)) on resting levels of CSNA, arterial pressure, and heart rate were determined in conscious normal sheep (n = 6) and sheep with pacing-induced HF (n = 7). HF was associated with a significant decrease in ejection fraction (from 74 ± 2% to 38 ± 1%, P < 0.001) and a significant increase in resting levels of CSNA burst incidence (from 56 ± 11 to 87 ± 2 bursts/100 heartbeats, P < 0.01). Infusion of tezosentan for 60 min significantly decreased resting mean aterial pressure (MAP) in both normal and HF sheep (-8 ± 4 mmHg and -4 ± 3 mmHg, respectively; P < 0.05). This was associated with a significant decrease in CSNA (by 25 ± 26% of control) in normal sheep, but there was no change in CSNA in HF sheep. Calculation of spontaneous baroreflex gain indicated significant impairment of the baroreflex control of HR after intravenous tezosentan infusion in normal animals but no change in HF animals. These data suggest that endogenous levels of ET-1 contribute to the baseline levels of CSNA in normal animals, but this effect is absent in HF.

  12. Evaluation of cardiac sympathetic neuronal integrity in diabetic patients using iodine-123 metaiodobenzylguanidine

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Sun Jung [Department of Diagnostic Radiology and Nuclear Medicine, Yonsei University, College of Medicine, 134 Shincheon-dong, Seodaemun-gu, Seoul, 120-752 (Korea, Republic of); Lee, Jong Doo [Department of Diagnostic Radiology and Nuclear Medicine, Yonsei University, College of Medicine, 134 Shincheon-dong, Seodaemun-gu, Seoul, 120-752 (Korea, Republic of); Ryu, Young Hoon [Department of Diagnostic Radiology and Nuclear Medicine, Yonsei University, College of Medicine, 134 Shincheon-dong, Seodaemun-gu, Seoul, 120-752 (Korea, Republic of); Jeon, Pyoung [Department of Diagnostic Radiology and Nuclear Medicine, Yonsei University, College of Medicine, 134 Shincheon-dong, Seodaemun-gu, Seoul, 120-752 (Korea, Republic of); Shim, Yong Woon [Department of Diagnostic Radiology and Nuclear Medicine, Yonsei University, College of Medicine, 134 Shincheon-dong, Seodaemun-gu, Seoul, 120-752 (Korea, Republic of); Yoo, Hyung Sik [Department of Diagnostic Radiology and Nuclear Medicine, Yonsei University, College of Medicine, 134 Shincheon-dong, Seodaemun-gu, Seoul, 120-752 (Korea, Republic of); Park, Chang Yun [Department of Diagnostic Radiology and Nuclear Medicine, Yonsei University, College of Medicine, 134 Shincheon-dong, Seodaemun-gu, Seoul, 120-752 (Korea, Republic of); Lim, Seung Gil [Department of Endocrinology, Yonsei University, College of Medicine, 134 Shincheon-dong, Seodaemun-gu, Seoul, 120-752 (Korea, Republic of)

    1996-04-01

    Autonomic dysfunction is associated with increased mortality in diabetic patients. To evaluate the cardiac autonomic dysfunction in these patients, a prospective study was undertaken using iodine-123 metaiodobenzylguanidine (MIBG) single-photon emission tomography (SPET). The study groups consisted of ten diabetic patients with cardiac autonomic neuropathy (group I) and six without autonomic neuropathy (group II). Autonomic nervous function tests, thallium scan, radionuclide ventriculographic data including ejection fraction and wall motion study, and 24-h urine catecholamine levels were evaluated. {sup 123}I-MIBG SPET was performed at 30 min and 4 h following injection of 3 mCi of {sup 123}I-MIBG in groups I and II and in normal subjects (n=4). On planar images, the heart to mediastinum (H/M) ratio was measured. Defect pattern and severity of MIBG uptake were qualitatively analysed on SPET. Compared with control subjects, diabetic patients had a reduced H/M ratio regardless of the presence of clinical autonomic neuropathy. There was no difference in H/M ratio between groups I and II. On SPET images, focal or diffuse defects were demonstrated in all patients in group I, and in five of the six patients in group II. The extent of defects tended to be more pronounced in group I than in group II. In conclusion, {sup 123}I-MIBG scan was found to be a more sensitive method than clinical autonomic nervous function tests for the detection of autonomic neuropathy in diabetes. (orig.). With 3 figs., 1 tab.

  13. Effects of nicorandil on cardiac sympathetic nerve activity after reperfusion therapy in patients with first anterior acute myocardial infarction

    Energy Technology Data Exchange (ETDEWEB)

    Kasama, Shu; Toyama, Takuji; Suzuki, Tadashi; Kurabayashi, Masahiko [Gunma University School of Medicine, Department of Cardiovascular Medicine, Maebashi (Japan); Kumakura, Hisao; Takayama, Yoshiaki; Ichikawa, Shuichi [Cardiovascular Hospital of Central Japan, Gunma (Japan)

    2005-03-01

    Ischaemic preconditioning (PC) is a cardioprotective phenomenon in which short periods of myocardial ischaemia result in resistance to decreased contractile dysfunction during a subsequent period of sustained ischaemia. Nicorandil, an ATP-sensitive potassium channel opener, can induce PC effects on sympathetic nerves during myocardial ischaemia. However, its effects on cardiac sympathetic nerve activity (CSNA) and left ventricular remodelling have not been determined. In this study, we sought to determine whether nicorandil administration improves CSNA in patients with acute myocardial infarction (AMI). We studied 58 patients with first anterior AMI, who were randomly assigned to receive nicorandil (group A) or isosorbide dinitrate (group B) after primary coronary angioplasty. The nicorandil or isosorbide dinitrate was continuously infused for >48 h. The extent score (ES) was determined from {sup 99m}Tc-pyrophosphate scintigraphy, and the total defect score (TDS) was determined from {sup 201}Tl scintigraphy 3-5 days after primary angioplasty. The left ventricular end-diastolic volume (LVEDV) and left ventricular ejection fraction (LVEF) were determined by left ventriculography 2 weeks later. The delayed heart/mediastinum count (H/M) ratio, delayed TDS and washout rate (WR) were determined from {sup 123}I-meta-iodobenzylguanidine (MIBG) images 3 weeks later. The left ventriculography results were re-examined 6 months after treatment. Fifty patients originally enrolled in the trial completed the entire protocol. After treatment, no significant differences were observed in ES or left ventricular parameters between the two groups. However, in group A (n=25), the TDSs determined from {sup 201}Tl and {sup 123}I-MIBG were significantly lower (26{+-}6 vs 30{+-}5, P<0.01, and 32{+-}8 vs 40{+-}6, P<0.0001, respectively), the H/M ratio significantly higher (1.99{+-}0.16 vs 1.77{+-}0.30, P<0.005) and the WR significantly lower (36%{+-}8% vs 44%{+-}12%, P<0.005) than in group B

  14. Reduction of sympathetic activity via adrenal-targeted GRK2 gene deletion attenuates heart failure progression and improves cardiac function after myocardial infarction.

    Science.gov (United States)

    Lymperopoulos, Anastasios; Rengo, Giuseppe; Gao, Erhe; Ebert, Steven N; Dorn, Gerald W; Koch, Walter J

    2010-05-21

    Chronic heart failure (HF) is characterized by sympathetic overactivity and enhanced circulating catecholamines (CAs), which significantly increase HF morbidity and mortality. We recently reported that adrenal G protein-coupled receptor kinase 2 (GRK2) is up-regulated in chronic HF, leading to enhanced CA release via desensitization/down-regulation of the chromaffin cell alpha(2)-adrenergic receptors that normally inhibit CA secretion. We also showed that adrenal GRK2 inhibition decreases circulating CAs and improves cardiac inotropic reserve and function. Herein, we hypothesized that adrenal-targeted GRK2 gene deletion before the onset of HF might be beneficial by reducing sympathetic activation. To specifically delete GRK2 in the chromaffin cells of the adrenal gland, we crossed PNMTCre mice, expressing Cre recombinase under the chromaffin cell-specific phenylethanolamine N-methyltransferase (PNMT) gene promoter, with floxedGRK2 mice. After confirming a significant ( approximately 50%) reduction of adrenal GRK2 mRNA and protein levels, the PNMT-driven GRK2 knock-out (KO) offspring underwent myocardial infarction (MI) to induce HF. At 4 weeks post-MI, plasma levels of both norepinephrine and epinephrine were reduced in PNMT-driven GRK2 KO, compared with control mice, suggesting markedly reduced post-MI sympathetic activation. This translated in PNMT-driven GRK2 KO mice into improved cardiac function and dimensions as well as amelioration of abnormal cardiac beta-adrenergic receptor signaling at 4 weeks post-MI. Thus, adrenal-targeted GRK2 gene KO decreases circulating CAs, leading to improved cardiac function and beta-adrenergic reserve in post-MI HF. GRK2 inhibition in the adrenal gland might represent a novel sympatholytic strategy that can aid in blocking HF progression.

  15. Significance of cardiac sympathetic nervous system abnormality for predicting vascular events in patients with idiopathic paroxysmal atrial fibrillation

    Energy Technology Data Exchange (ETDEWEB)

    Akutsu, Yasushi; Kaneko, Kyouichi; Kodama, Yusuke; Li, Hui-Ling; Kawamura, Mitsuharu; Asano, Taku; Hamazaki, Yuji; Tanno, Kaoru; Kobayashi, Youichi [Showa University School of Medicine, Division of Cardiology, Department of Medicine, Tokyo (Japan); Suyama, Jumpei; Shinozuka, Akira; Gokan, Takehiko [Showa University School of Medicine, Department of Radiology, Tokyo (Japan)

    2010-04-15

    Neuronal system activity plays an important role for the prognosis of patients with atrial fibrillation (AF). Using {sup 123}I metaiodobenzylguanidine ({sup 123}I-MIBG) scintigraphy, we investigated whether a cardiac sympathetic nervous system (SNS) abnormality would be associated with an increased risk of vascular events in patients with paroxysmal AF. {sup 123}I-MIBG scintigraphy was performed in 69 consecutive patients (67 {+-} 13 years, 62% men) with paroxysmal AF who did not have structural heart disease. SNS integrity was assessed from the heart to mediastinum (H/M) ratio on delayed imaging. Serum concentration of C-reactive protein (CRP) was measured before {sup 123}I-MIBG study. During a mean of 4.5 {+-} 3.6 years follow-up, 19 patients had myocardial infarction, stroke or heart failure (range: 0.2-11.5 years). SNS abnormality (H/M ratio <2.7) and high CRP ({>=}0.3 mg/dl) were associated with the vascular events (58.3% in 14 of 24 patients with SNS abnormality vs 11.1% in 5 of 45 patients without SNS abnormality, p < 0.0001, 52.4% in 11 of 21 patients with high CRP vs 16.7% in 8 of 48 patients without high CRP, p < 0.0001). After adjustment for potential confounding variables such as age, left atrial dimension and left ventricular function, SNS abnormality was an independent predictor of vascular events with a hazard ratio of 4.1 [95% confidence interval (CI): 1.3-12.6, p = 0.014]. Further, SNS abnormality had an incremental and additive prognostic power in combination with high CRP with an adjusted hazard ratio of 4.1 (95% CI: 1.5-10.9, p = 0.006). SNS abnormality is predictive of vascular events in patients with idiopathic paroxysmal AF. (orig.)

  16. 去肾上腺素能交感神经支配对大鼠良性增生前列腺的影响%Damage induced by losing innervation of sympathetic nerve in rats' benign hyperplastic prostate

    Institute of Scientific and Technical Information of China (English)

    蔡建良; 辛殿祺; 何群; 汤秀琴; 那彦群

    2008-01-01

    目的 探索去除肾上腺素能交感神经支配后大鼠良性增生前列腺的组织、细胞病理学变化.方法 30周龄雄性自发性高血压大鼠65只,随机分配为手术组、手术对照组和正常对照组.手术组切断双侧盆腔主要神经节的交感腹下神经来源支,然后行膀胱造口术;手术对照组仅行膀胱造口术.分别于术后3、7、11、15、≥21 d分批处死大鼠,观察各组大鼠前列腺大体形态学、组织学和细胞超微结构改变.结果 大鼠实验模型均制作成功.手术组大鼠前列腺在后期(手术15 d后)出现轻微的质地变硬,颜色和形状变化不明显,前列腺湿重/大鼠体重比值随术后时间的延长有下降趋势,前列腺组织干重/湿重比值在手术15 d后逐渐升高,但与手术对照组比较差异均无统计学意义.镜下观:手术组大鼠前列腺早期出现腺腔明显扩张、前列腺液积存和凝块形成,平滑肌拉长变薄,但后期病变逐步缓解,腺上皮层无变化.透射电镜:手术组大鼠前列腺腺细胞、基底膜无明显变化,但平滑肌术后3 d出现肌膜皱缩,肌丝、密体和密斑结构不清晰等改变,术后11 d后,病变逐步好转.手术对照组无上述变化.结论 彻底去除肾上腺素能交感神经支配后,大鼠良性增生前列腺的平滑肌出现短时间的结构受损和功能障碍,后期能自行部分恢复.%Objective To study the pathologic change of rats' benign hyperplastic prostate after losing the innervation of sympathetic nerve. Methods A total of 65 male spontaneous hypertension rats (SHR) aged 30 weeks old were randomly assigned into treatment group, sham surgery control group and normal control group. In treatment group, the originating branches of sympathetic hypngastric nerve of the bilateral major pelvic ganglions were truncated following the performance of eystostomy. The rata were sac-rificed at day 3,7,11,15 and≥21 post-operation respectively. The gross

  17. Assessment of myocardial adrenergic innervation in patients with sick sinus syndrome: effect of asynchronous ventricular activation from ventricular apical stimulation

    OpenAIRE

    Marketou, M E; Simantirakis, E N; Prassopoulos, V K; Chrysostomakis, S I; Velidaki, A A; Karkavitsas, N S; Vardas, P.E.

    2002-01-01

    Objective: To investigate ventricular sympathetic innervation in patients with sick sinus syndrome and to detect regional deterioration of adrenergic innervation caused by asynchronous ventricular activation from right ventricular pacing.

  18. Glial cell line-derived neurotrophic factor (GDNF) enhances sympathetic neurite growth in rat hearts at early developmental stages.

    Science.gov (United States)

    Miwa, Keiko; Lee, Jong-Kook; Takagishi, Yoshiko; Opthof, Tobias; Fu, Xianming; Kodama, Itsuo

    2010-12-01

    Molecular signaling of sympathetic innervation of myocardium is an unresolved issue. The purpose of this study was to investigate the effect of neurotrophic factors on sympathetic neurite growth towards cardiomyocytes. Cardiomyocytes (CMs) and sympathetic neurons (SNs) were isolated from neonatal rat hearts and superior cervical ganglia, and were co-cultured, either in a random or localized way. Neurite growth from SNs toward CMs was assessed by immunohistochemistry for neurofilament M and α-actinin in response to neurotrophic factors-nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), glial cell line-derived neurotrophic factor (GDNF), ciliary neurotrophic factor (CNTF) and a chemical repellent, semaphorin 3A. As a result, GDNF as well as NGF and BDNF stimulated neurite growth. GDNF enhanced neurite outgrowth even under the NGF-depleted culture condition, excluding an indirect effect of GDNF via NGF. Quantification of mRNA and protein by real-time PCR and immunohistochemistry at different developmental stages revealed that GDNF is abundantly expressed in the hearts of embryos and neonates, but not in adult hearts. GDNF plays an important role in inducing cardiac sympathetic innervation at the early developmental stages. A possible role in (re)innervation of injured or transplanted or cultured and transplanted myocardium may deserve investigation.

  19. Effects of perindopril on cardiac sympathetic nerve activity in patients with congestive heart failure: comparison with enalapril

    Energy Technology Data Exchange (ETDEWEB)

    Kasama, Shu; Toyama, Takuji; Suzuki, Tadashi; Kurabayashi, Masahiko [Gunma University School of Medicine, Department of Cardiovascular Medicine, Maebashi, Gunma (Japan); Kumakura, Hisao; Takayama, Yoshiaki; Ichikawa, Shuichi [Cardiovascular Hospital of Central Japan, Department of Internal Medicine, Gunma (Japan)

    2005-08-01

    The production of aldosterone in the heart is suppressed by the angiotensin-converting enzyme (ACE) inhibitor perindopril in patients with congestive heart failure (CHF). Moreover, perindopril has been reported to have more cardioprotective effects than enalapril. Forty patients with CHF [left ventricular ejection fraction (LVEF) <45%; mean 33{+-}7%] were randomly assigned to perindopril (2 mg/day; n=20) or enalapril (5 mg/day; n=20). All patients were also treated with diuretics. The delayed heart/mediastinum count (H/M) ratio, delayed total defect score (TDS) and washout rate (WR) were determined from {sup 123}I-meta-iodobenzylguanidine (MIBG) images, and plasma brain natriuretic peptide (BNP) concentrations were measured before and 6 months after treatment. The left ventricular end-diastolic volume (LVEDV), left ventricular end-systolic volume (LVESV) and LVEF were also determined by echocardiography. After treatment, in patients receiving perindopril, TDS decreased from 39{+-}10 to 34{+-}9 (P<0.01), H/M ratios increased from 1.62{+-}0.27 to 1.76{+-}0.29 (P<0.01), WR decreased from 50{+-}14% to 42{+-}14% (P<0.05) and plasma BNP concentrations decreased from 226{+-}155 to 141{+-}90 pg/ml (P<0.0005). In addition, the LVEDV decreased from 180{+-}30 to 161{+-}30 ml (P<0.05) and the LVESV decreased from 122{+-}35 to 105{+-}36 ml (P<0.05). Although the LVEF tended to increase, the change was not statistically significant (from 33{+-}8% to 36{+-}12%; P=NS). On the other hand, there were no significant changes in these parameters in patients receiving enalapril. Plasma BNP concentrations, {sup 123}I-MIBG scintigraphic and echocardiographic parameters improved after 6 months of perindopril treatment. These findings indicate that perindopril treatment can ameliorate the cardiac sympathetic nerve activity and the left ventricular performance in patients with CHF. (orig.)

  20. The utility of the Golgi-Cox method in the morphological characterization of the autonomic innervation in the rat heart.

    Science.gov (United States)

    Gómez-Villalobos, M J; Gordillo, Aurora Calvo; López, José Rubicel Hernández; Flores, Gonzalo

    2009-04-30

    The autonomic innervation in the heart is predominantly by postganglionic, parasympathetic, and sympathetic neurons, which are organized in a plexus of ganglions into the heart. The knowledge of the density, distribution, location, morphology, and intrinsic connection of this system that constitute the heart autonomic innervation is limited and controversial. Methods that provide clear information in this field are desirable. A widely used method to study the morphology of the nerve cells in the central nervous system (CNS) is used in this study to characterize the autonomic innervation in rat hearts. The method consisted of impregnation of the fresh whole heart of 12 adult male Wistar rats with the Golgi-Cox stain for 30 days, after which they were incubated in 30% sucrose solution for 2-3 days and then were sectioned (200 microm) with a vibratome. The tissues were mounted on gelatin-covered slides and analyzed by using the Sholl method under light microscopy adapted to a camera lucida. The results clearly show a distribution of the ganglion plexuses in the epicardium, myocardium, and endocardium, joined by an extensive network of nerve fibers in the four cardiac chambers. We also identified and characterized the morphology of an isolated cardiac nerve cell. As results similar to that in the CNS, the Golgi-Cox method is a simple, efficient, and an accessible tool to study the autonomic innervation in the rat heart and provides a good resolution of the morphology of the plexuses of the ganglions and nerve fibers.

  1. Use of iodine-123 metaiodobenzylguanidine scintigraphy to assess cardiac sympathetic denervation and the impact of hypertension in patients with non-insulin-dependent diabetes mellitus

    Energy Technology Data Exchange (ETDEWEB)

    Tamura, Koji; Nakatani, Yuko; Onishi, Satoshi [Dept. of Internal Medicine, Keihanna Hospital, Hirakata City, Osaka (Japan); Utsunomiya, Keita; Saika, Yoshinori [Dept. of Radiology, Keihanna Hospital, Hirakata City (Japan); Iwasaka, Toshiji [Cardiovascular Center, Kansai Medical University, Osaka (Japan)

    1999-10-01

    The objectives of this clinical study using iodine-123 metaiodobenzylguanidine (MIBG) scintigraphy were (a) to evaluate cardiac sympathetic denervation in non-insulin-dependent diabetes mellitus (NIDDM) patients with and without hypertension and (b) to investigate the relation between cardiac sympathetic denervation and prognosis in NIDDM patients. We compared clinical characteristics and MIBG data [heart to mediastinum (H/M) ratio and % washout rate (WR)] in a control group and NIDDM patients with and without hypertension. MIBG scintigraphy was performed in 11 controls and 82 NIDDM patients without overt cardiovascular disease except for hypertension (systolic blood pressure {>=}140 and/or diastolic blood pressure {>=}90 mmHg). After MIBG examination, blood pressure was measured regularly in all NIDDM patients. There were significant differences between 65 normotensive and 17 hypertensive NIDDM patients with respect to age (55{+-}11 vs 63{+-}12 years, respectively, P<0.05), prevalence of diabetic retinopathy (12% vs 35%, respectively, P<0.05) and systolic blood pressure (120{+-}12 vs 145{+-}16 mmHg, respectively, P<0.001). The H/M ratio in hypertensive NIDDM patients was significantly lower than in the control group (1.81{+-}0.29 vs 2.27{+-}0.20, respectively, P<0.01). During the follow-up period (18{+-} 12 months), 17 NIDDM patients newly developed hypertension after MIBG examination. There were no significant differences in their clinical characteristics compared with persistently normotensive or hypertensive NIDDM patients. %WR in patients with new onset hypertension was significantly higher than in the control group (30.88%{+-}16.87% vs 12.89%{+-}11.94%, respectively, P<0.05). Moreover, in these patients %WR correlated with duration from the date of MIBG scintigraphy to the onset of hypertension (r=-0.512, P<0.05). Five NIDDM patients died during the follow-up period (four newly hypertensive patients and one normotensive patient). There were significant

  2. Usefulness of {sup 123}I-Meta-iodobenzylguanidine (MIBG) myocardial scintigraphy for evaluation of cardiac sympathetic nervous system function in diabetic patients.

    Energy Technology Data Exchange (ETDEWEB)

    Tamura, Koji; Nakatani, Yuko; Doi, Kenji; Adachi, Gakuji; Takada, Kou

    2001-11-01

    The cardiac sympathetic nervous system function of diabetic patients with no definite cardiovascular complications other than hypertension was evaluated by {sup 123}I -MIBG myocardial scintigraphy. The subjects consisted of 82 diabetic patients, 59 men, 23 women, mean age 57 years, 17 with hypertension and 65 with normal blood pressure, and they were compared with normal controls (8 men and 3 women, mean age 54 years). Myocardial scintigraphy was performed 10 minutes and 4 hours after administration of MIBG. The superior mediastinum and whole myocardium were set as regions of interest, and the heart-to-mediastinum ratio (H/M ratio) and the washout rate (%WR) were calculated. The mean observation period was 18{+-}12 months, and 17 of the 65 diabetic patients with normal blood pressure before the study developed hypertension during the observation period. There were significant differences in H/M ratio and %WR between the diabetic patients and normal controls (H/M ratio; 1.96{+-}0.34 vs 2.27{+-}0.20, %WR; 24.71{+-}16.99% vs 12.89{+-}11.94). The diabetic patients with hypertension had higher morbidity with diabetic retinopathy and a lower H/M ratio. The 17 patients who developed hypertension during the observation period showed an increase in %WR and a reduction in the H/M ratio. Five patients who died during the observation period had a reduced H/M ratio and increased of %WR. {sup 123}I-MIBG myocardial scintigraphy in diabetic patients was shown to be useful for detecting cardiac sympathetic nervous system dysfunction, predicting the development of hypertension, and identifying patients who had a poor outcome. Diabetic patients with abnormal signals on MIBG myocardial scintigraphy need to be monitored much more carefully. (K.H.)

  3. Diesel Exhaust-Induced Cardiac Dysfunction Is Mediated by Sympathetic Dominance in Heart Failure-Prone Rats

    Science.gov (United States)

    Short-term exposure to vehicular emissions is associated with adverse cardiac events. Diesel exhaust (DE) may provoke cardiac events through defective co-ordination of the two main autonomic nervous system (ANS) branches. We exposed heart failure-prone rats once to DE (500 g/m3 ...

  4. Neural regulation of gastrointestinal inflammation: role of the sympathetic nervous system.

    Science.gov (United States)

    Cervi, Andrea L; Lukewich, Mark K; Lomax, Alan E

    2014-05-01

    The sympathetic innervation of the gastrointestinal (GI) tract regulates motility, secretion and blood flow by inhibiting the activity of the enteric nervous system (ENS) and direct vasoconstrictor innervation of the gut microvasculature. In addition to these well-established roles, there is evidence that the sympathetic nervous system (SNS) can modulate GI inflammation. Postganglionic sympathetic neurons innervate lymphoid tissues and immune cells within the GI tract. Furthermore, innate and adaptive immune cells express receptors for sympathetic neurotransmitters. Activation of these receptors can affect a variety of important immune cell functions, including cytokine release and differentiation of helper T lymphocyte subsets. This review will consider the neuroanatomical evidence of GI immune cell innervation by sympathetic axons, the effects of blocking or enhancing SNS activity on GI inflammation, and the converse modulation of sympathetic neuroanatomy and function by GI inflammation.

  5. Efeito do carvedilol a curto prazo na atividade simpática cardíaca pela cintilografia com 123I-MIBG Effects of short-term carvedilol on the cardiac sympathetic activity assessed by 123I-MIBG scintigraphy

    Directory of Open Access Journals (Sweden)

    Sandra Marina Ribeiro de Miranda

    2010-03-01

    Full Text Available FUNDAMENTO: Alterações autonômicas na insuficiência cardíaca estão associadas a um aumento da morbimortalidade. Vários métodos não invasivos têm sido empregados para avaliar a função simpática, incluindo a imagem cardíaca com 123I-MIBG. OBJETIVO: Avaliar a atividade simpática cardíaca, por meio da cintilografia com 123I-MIBG, antes e após três meses de terapia com carvedilol em pacientes com insuficiência cardíaca com fração de ejeção do VE BACKGROUND: Autonomic alterations in heart failure are associated with an increase in morbimortality. Several noninvasive methods have been employed to evaluate the sympathetic function, including the Meta-Iodobenzylguanidine (123I-MIBG scintigraphy imaging of the heart. OBJECTIVE: to evaluate the cardiac sympathetic activity through 123I-MIBG scintigraphy, before and after three months of carvedilol therapy in patients with heart failure and left ventricular ejection fraction (LVEF < 45%. PATIENTS AND METHODS: Sixteen patients, aged 56.3 ± 12.6 years (11 males, with a mean LVEF of 28% ± 8% and no previous use of beta-blockers were recruited for the study. Images of the heart innervation were acquired with 123I-MIBG, and the serum levels of catecholamines (epinephrine, dopamine and norepinephrine were measured; the radioisotope ventriculography (RIV was performed before and after a three-month therapy with carvedilol. RESULTS: Patients' functional class showed improvement: before the treatment, 50% of the patients were FC II and 50% were FC III. After 3 months, 7 patients were FC I (43.8% and 9 were FC II (56.2%, (p = 0.0001. The mean LVEF assessed by RIV increased from 29% to 33% (p = 0.017. There was no significant variation in cardiac adrenergic activity assessed by 123I-MIBG (early and late resting images and washout rate. No significant variation was observed regarding the measurement of catecholamines. CONCLUSION: The short-term treatment with carvedilol promoted the clinical

  6. Sympathetic reinnervation in cardiac transplants : preliminary results {sup 123}I-MIBG and {sup 201}Tl/{sup 99m}Tc-MIBI scintigraphy

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Joug Ho; Oh, Se Jin; Son, Min Soo; Son, Ji Won; Choi, In Seok; Shin, Euk Kyun; Park, Kuk Yang; Kim, Ju E. [International Medicine and Thoraic Surgery, Inchon (Korea, Republic of)

    1997-07-01

    Iodine-123 metaiodobenzylguanidine ({sup 123}I-MIBG) is a norepinephrine (NE) analogue. To determine whether cardiac sympathetic reinnervation occurs after orthotopic heart transplantation (TPL). Nine patients (M : F=7 :2; mean ages=34{+-}24.1 yr; idiopathic:rheumatic = 8: 1) within 197.{+-}14.3 (4-36) months after TPL performed both {sup 123}I-MIBG scintigraphy and {sup 201}Tl/{sup 99m}Tc-MIBI dipyridamole stress gated myocardial perfusion SPECT (g-MPS). {sup 23}I-MIBG imagings were performed in anterior position 15 minutes, 4 and 24 hours after i.v. injection of 148 MBq {sup 123}I MIBG. Image quantitation was based on the ratio of hear to mediastinal MIBG uptake (HMR). Six subjects with <14 (4.3{+-}1.4) months after TPL had no visible {sup 123}I-MIBG uptake on early 15. min imaging however, three subjects with 26 to 36(32.0{+-}5.3) months had visible cardiac {sup 123}I-MIBG uptake (HMR:1.24{+-}0.09 vs. 1.8{+-}0.2). Correlation was found between plasma NE concentration and HMR(r=0.80: p<0.05). Compared to HMR on 15 min images (1.5{+-}0.3), neither four nor 24 hour delayed images (1.3{+-}0.3 vs. 1.1{+-}0.1 : p<0.05, respectively, ANOVA) showed definite delayed localization of MIBG. The uptakes in the liver, lung, salivary glands and spleen were present. To dipyridamole stress, transplant hearts showed significant subnormal hemodynamic responses of HR, s-BP, d-BP, and rate pressure product (95.4{+-}13.8 to 107.4{+-}14.6, 131.0{+-}16.7 to 123.6{+-}13.4, 79.1{+-}12.7 to 72.2{+-}12.7, 124.5{+-}19.6 to 133.0{+-}23.6 p<0.05, respectively). G-MPS of one patient shod an apicoanterior wall reversible perfusion defect which was confirmed as 90% distal left anterior descending artery stenosis by coronary angiography. MIBG uptake seems to involve mainly the specific sodium and energy dependent uptake-1 pathway, and the non-neuronal uptake-2 involving simple diffusion is not significant. Conclusively, partial sympathetic late reinnervation of the transplant human hearts can

  7. Co-expression pattern of dopamine beta-hydroxylase (DβH) and neuropeptide Y (NPY) within sympathetic innervation of ovary and umbilical cord of the European bison (Bison bonasus L.).

    Science.gov (United States)

    Skobowiat, Cezary; Panasiewicz, Grzegorz; Gizejewski, Zygmunt; Szafranska, Bozena

    2013-12-01

    Co-expression of dopamine β-hydroxylase (DβH) and neuropeptide Y (NPY) has never been examined in ovary (OV) and umbilical cord (UC) of the European bison (Eb), the endangered wild species. The OV and UC samples were harvested from seasonally eliminated Eb females (45-120 days post coitum). Frozen histological sections were examined by double fluorescent immunohistochemistry (dF-IHC), using the primary mouse anti-DβH monoclonals and rabbit anti-NPY polyclonals and then the immunocomplexes were visualized with FITC and CY3 fluorophores, respectively. Numerous DβH immunoreactive nerve fibers (DβH-IRs) and a little less frequent NPY-IRs were found in the bundle-like structures, innervating mainly perivascular regions of the OV. The NPY-IRs constantly co-expressed DβH, while some DβH-IRs did not express NPY. This specific pattern of innervation was observed both in the stromal and cortical regions of the OV. The simultaneous co-expression of DβH and NPY were also detected in the UC, in which specific single or bundle-like structures ran along the smooth muscles of blood vessels. The spatial-specific co-expression of DβH and NPY in OV and UC, may suggest that these markers are involved in the control of vascularization that regulates nourishing blood circulation required for proper pregnancy maintenance and efficient embryo/fetus development in the Eb.

  8. The oestrogenized rat myometrium inhibits organotypic sympathetic reinnervation.

    Science.gov (United States)

    Brauer, M M; Chávez-Genaro, R; Richeri, A; Viettro, L; Frias, A I; Burnstock, G; Cowen, T

    2002-10-31

    Chronic administration of oestrogen to rats during the infantile/prepubertal period provokes, at 28 days of age, complete loss of noradrenaline-labelled intrauterine sympathetic nerves. It is not known whether oestrogen inhibits the growth or causes the degeneration of developing uterine sympathetic nerves, or whether the uterus recovers its innervation following cessation of infantile/prepubertal oestrogen treatment. In the present study, we analysed the time-course of the effects of oestrogen on the development of uterine sympathetic nerves in the rat, using histochemical methods. In addition, the pattern of sympathetic reinnervation of the uterus of intact and ovariectomised females was assessed 3 and 6 months after cessation of chronic oestrogen treatment. The ability of sympathetic nerves to reinnervate the oestrogenized uterine tissue was assessed in intraocular transplants of uterine myometrium into ovariectomised host rats. Early exposure to oestrogen did not inhibit the approach of sympathetic nerves to the uterus, but prevented the normal growth and maturation of intrauterine sympathetic fibres and abolished the innervation that reached the organ before initiation of treatment. Three or six months following cessation of oestrogen treatment, most of the sympathetic nerves were restricted to the mesometrium and mesometrial entrance, whereas intrauterine innervation remained persistently depressed as a consequence of a sustained oestrous-like state provoked by ovarian dysfunction (polycystic ovary). An organotypic regrowth of uterine sympathetic nerves was observed in ovariectomised infantile/prepubertal oestrogen-treated animals. After 5 weeks in oculo, the innervation of oestrogenized myometrial transplants was reduced by 50%, and substantial changes in the pattern of reinnervation were observed. In control transplants, 86% of the nerves were terminal varicose myometrial and perivascular nerve fibres, whereas 14% were preterminal nerve bundles. In

  9. Cardiac Iodine-123-Meta-Iodo-Benzylguanidine Uptake in Carotid Sinus Hypersensitivity.

    Directory of Open Access Journals (Sweden)

    Maw Pin Tan

    Full Text Available Carotid sinus syndrome is the association of carotid sinus hypersensitivity with syncope, unexplained falls and drop attacks in generally older people. We evaluated cardiac sympathetic innervation in this disorder in individuals with carotid sinus syndrome, asymptomatic carotid sinus hypersensitivity and controls without carotid sinus hypersensitivity.Consecutive patients diagnosed with carotid sinus syndrome at a specialist falls and syncope unit were recruited. Asymptomatic carotid sinus hypersensitivity and non-carotid sinus hypersensitivity control participants recruited from a community-dwelling cohort. Cardiac sympathetic innervation was determined using Iodine-123-metaiodobenzylguanidine (123-I-MIBG scanning. Heart to mediastinal uptake ratio (H:M were determined for early and late uptake on planar scintigraphy at 20 minutes and 3 hours following intravenous injection of 123-I-MIBG.Forty-two subjects: carotid sinus syndrome (n = 21, asymptomatic carotid sinus hypersensitivity (n = 12 and no carotid sinus hypersensitivity (n = 9 were included. Compared to the non- carotid sinus hypersensitivity control group, the carotid sinus syndrome group had significantly higher early H:M (estimated mean difference, B = 0.40; 95% confidence interval, CI = 0.13 to 0.67, p = 0.005 and late H:M (B = 0.32; 95%CI = 0.03 to 0.62, p = 0.032. There was, however, no significant difference in early H:M (p = 0.326 or late H:M (p = 0.351 between the asymptomatic carotid sinus hypersensitivity group and non- carotid sinus hypersensitivity controls.Cardiac sympathetic neuronal activity is increased relative to age-matched controls in individuals with carotid sinus syndrome but not those with asymptomatic carotid sinus hypersensitivity. Blood pressure and heart rate measurements alone may therefore represent an over simplification in the assessment for carotid sinus syndrome and the relative increase in cardiac sympathetic innervation provides additional clues to

  10. [The sources of the adrenergic innervation of the rat uterus].

    Science.gov (United States)

    Proĭmina, F I; Rakitskaia, V V

    1990-09-01

    Complete disappearance of adrenergic fibers in the rat uterus is only possible after complete removal of ovaries along with ovarian plexus, transection of the uterus-vaginal connexion and removal of a portion of sympathetic nervous trunk. "Long" adrenergic neurons situated in spinal sympathetic ganglia, seem not to be the only source of sympathetic innervation of the myometrium's vessels. A part of nervous fibers of vascular plexuses and all muscle nerves are represented by "short" neurons starting from the ganglionic structures of the uterus-vaginal connexion.

  11. Chemistry and biology of radiotracers that target changes in sympathetic and parasympathetic nervous systems in heart disease.

    Science.gov (United States)

    Eckelman, William C; Dilsizian, Vasken

    2015-06-01

    Following the discovery of the sympathetic and parasympathetic nervous system, numerous adrenoceptor drugs were radiolabeled and potent radioligands were prepared in order to image the β-adrenergic and the muscarinic systems. But the greatest effort has been in preparing noradrenaline analogs, such as norepinephrine, (11)C-metahydroxyephedrine, and (123)I-metaiodobenzylguanidine that measure cardiac sympathetic nerve varicosities. Given the technical and clinical challenges in designing and validating targeted adrenoceptor-binding radiotracers, namely the heavily weighted flow dependence and relatively low target-to-background ratio, both requiring complicated mathematic analysis, and the inability of targeted adrenoceptor radioligands to have an impact on clinical care of heart disease, the emphasis has been on radioligands monitoring the norepinephrine pathway. The chemistry and biology of such radiotracers, and the clinical and prognostic impact of these innervation imaging studies in patients with heart disease, are examined.

  12. The posterior vermis of the cerebellum selectively inhibits 10-Hz sympathetic nerve discharge in anesthetized cats.

    Science.gov (United States)

    Barman, Susan M; Gebber, Gerard L

    2009-07-01

    We studied the changes in inferior cardiac sympathetic nerve discharge (SND) and mean arterial pressure (MAP) produced by aspiration or chemical inactivation (muscimol microinjection) of lobule IX (uvula) of the posterior vermis of the cerebellum in baroreceptor-denervated and baroreceptor-innervated cats anesthetized with urethane. Autospectral analysis was used to decompose SND into its frequency components. Special attention was paid to the question of whether the experimental procedures affected the rhythmic (10-Hz and cardiac-related) components of SND. Aspiration or chemical inactivation of lobule IX produced an approximately three-fold increase in the 10-Hz rhythmic component of SND (P cats. Total power (0- to 20-Hz band) was unchanged. Despite the absence of a change in total power in SND, there was a statistically significant increase in MAP. In baroreceptor-innervated cats, neither aspiration nor chemical inactivation of the uvula caused a significant change in cardiac-related or total power in SND or MAP. These results are the first to demonstrate a role of cerebellar cortical neurons of the posterior vermis in regulating the frequency composition of naturally occurring SND. Specifically, these neurons selectively inhibit the 10-Hz rhythm-generating network in baroreceptor-denervated, urethane-anesthetized cats. The functional implications of these findings are discussed.

  13. Effects of sympathetic innervation loss on rat mandibular distraction osteogenesis%失交感神经支配对大鼠下颌骨牵张成骨影响的研究

    Institute of Scientific and Technical Information of China (English)

    王涛; 雷德林; 王磊; 曹健; 张雅博; 杜兆杰

    2011-01-01

    目的 探讨失交感神经支配对大鼠下颌骨牵张成骨新骨形成的影响.方法 雄性SD大鼠30只,随机分为2组,对照组(A组,15只)实施右侧下颌骨牵张成骨,实验组(B组,15只)实施双侧颈交感干离断及右侧下颌骨牵张成骨.术后在固定期1、14、28天取材,对牵张间隙新生骨痂进行大体形态及HE染色骨组织定量观察.应用SPSS12.0软件包进行两样本t检验.结果 两组牵张间隙均充满新生骨痂,在固定期1、14天实验组比对照组新生骨痂更平整连续,在固定期28天两组未见明显差异; 石蜡切片HE染色显示实验组较对照组有更多新骨形成,在固定期1、14及28天时,牵张间隙实验组的骨量百分比均高于对照组(P<0.05).结论 失交感神经支配可增强下颌骨牵张成骨新骨形成,提示交感神经系统在牵张成骨过程中起到一定调控作用.%Objective To investigate the effects of sympathetic iunervation loss on new bone formation in rat mandibular distraction osteogenesis. Methods A total of 30 male Sprague-Dawley rats were divided into two groups randomly. Control group ( group A, n = 15 ) only underwent right mandibular distraction osteogenesis, and experimental group( group B,n = 15) underwent bilateral transection of cervical sympathetic trunk( TCST) and then right mandibular distraction osteogenesis. The rats were sacrificed at consolidation time of 1,14 and 28 days, and then the regenerated callus underwent general observation, HE staining and histomorphometric analysis. A two-sampie t test was performed using SPSS 12.0 software package. Results General observation showed that the distraction gap was filled with new formed bone callus in two groups. At the consolidation time of 1 and 14 days,the new bone callus of group A was smoother than group B, but no obvious difference at the consolidation time of 28 days.HE staining indicated more bone formation in group B. Histological analysis showed that both new bone

  14. Sympathetic Activation Does Not Affect the Cardiac and Respiratory Contribution to the Relationship between Blood Pressure and Pial Artery Pulsation Oscillations in Healthy Subjects.

    Directory of Open Access Journals (Sweden)

    Pawel J Winklewski

    Full Text Available Using a novel method called near-infrared transillumination backscattering sounding (NIR-T/BSS that allows for the non-invasive measurement of pial artery pulsation (cc-TQ and subarachnoid width (sas-TQ in humans, we assessed the influence of sympathetic activation on the cardiac and respiratory contribution to blood pressure (BP cc-TQ oscillations in healthy subjects.The pial artery and subarachnoid width response to handgrip (HGT and cold test (CT were studied in 20 healthy subjects. The cc-TQ and sas-TQ were measured using NIR-T/BSS; cerebral blood flow velocity (CBFV was measured using Doppler ultrasound of the left internal carotid artery; heart rate (HR and beat-to-beat mean BP were recorded using a continuous finger-pulse photoplethysmography; respiratory rate (RR, minute ventilation (MV, end-tidal CO2 (EtCO2 and end-tidal O2 (EtO2 were measured using a metabolic and spirometry module of the medical monitoring system. Wavelet transform analysis was used to assess the relationship between BP and cc-TQ oscillations.HGT evoked an increase in BP (+15.9%; P<0.001, HR (14.7; P<0.001, SaO2 (+0.5; P<0.001 EtO2 (+2.1; P<0.05 RR (+9.2%; P = 0.05 and MV (+15.5%; P<0.001, while sas-TQ was diminished (-8.12%; P<0.001, and a clear trend toward cc-TQ decline was observed (-11.0%; NS. CBFV (+2.9%; NS and EtCO2 (-0.7; NS did not change during HGT. CT evoked an increase in BP (+7.4%; P<0.001, sas-TQ (+3.5%; P<0.05 and SaO2(+0.3%; P<0.05. HR (+2.3%; NS, CBFV (+2.0%; NS, EtO2 (-0.7%; NS and EtCO2 (+0.9%; NS remained unchanged. A trend toward decreased cc-TQ was observed (-5.1%; NS. The sas-TQ response was biphasic with elevation during the first 40 seconds (+8.8% vs. baseline; P<0.001 and subsequent decline (+4.1% vs. baseline; P<0.05. No change with respect to wavelet coherence and wavelet phase coherence was found between the BP and cc-TQ oscillations.Short sympathetic activation does not affect the cardiac and respiratory contribution to the relationship

  15. Glial cell line-derived neurotrophic factor (GDNF) enhances sympathetic neurite growth in rat hearts at early developmental stages

    NARCIS (Netherlands)

    K. Miwa; J.K. Lee; Y. Takagishi; T. Opthof; X. Fu; I. Kodama

    2010-01-01

    Molecular signaling of sympathetic innervation of myocardium is an unresolved issue. The purpose of this study was to investigate the effect of neurotrophic factors on sympathetic neurite growth towards cardiomyocytes. Cardiomyocytes (CMs) and sympathetic neurons (SNs) were isolated from neonatal ra

  16. The sympathetic nervous system in obesity hypertension.

    Science.gov (United States)

    Lohmeier, Thomas E; Iliescu, Radu

    2013-08-01

    Abundant evidence supports a role of the sympathetic nervous system in the pathogenesis of obesity-related hypertension. However, the nature and temporal progression of mechanisms underlying this sympathetically mediated hypertension are incompletely understood. Recent technological advances allowing direct recordings of renal sympathetic nerve activity (RSNA) in conscious animals, together with direct suppression of RSNA by renal denervation and reflex-mediated global sympathetic inhibition in experimental animals and human subjects have been especially valuable in elucidating these mechanisms. These studies strongly support the concept that increased RSNA is the critical mechanism by which increased central sympathetic outflow initiates and maintains reductions in renal excretory function, causing obesity hypertension. Potential determinants of renal sympathoexcitation and the differential mechanisms mediating the effects of renal-specific versus reflex-mediated, global sympathetic inhibition on renal hemodynamics and cardiac autonomic function are discussed. These differential mechanisms may impact the efficacy of current device-based approaches for hypertension therapy.

  17. PET and SPET tracers for mapping the cardiac nervous system

    Energy Technology Data Exchange (ETDEWEB)

    Langer, Oliver; Halldin, Christer [Department of Clinical Neuroscience, Psychiatry Section, Karolinska Institute, Karolinska Hospital, 17176 Stockholm (Sweden)

    2002-03-01

    The human cardiac nervous system consists of a sympathetic and a parasympathetic branch with (-)-norepinephrine and acetylcholine as the respective endogenous neurotransmitters. Dysfunction of the cardiac nervous system is implicated in various types of cardiac disease, such as heart failure, myocardial infarction and diabetic autonomic neuropathy. In vivo assessment of the distribution and function of cardiac sympathetic and parasympathetic neurones with positron emission tomography (PET) and single-photon emission tomography (SPET) can be achieved by means of a number of carbon-11-, fluorine-18-, bromine-76- and iodine-123-labelled tracer molecules. Available tracers for mapping sympathetic neurones can be divided into radiolabelled catecholamines, such as 6-[{sup 18}F]fluorodopamine, (-)-6-[{sup 18}F]fluoronorepinephrine and (-)-[{sup 11}C]epinephrine, and radiolabelled catecholamine analogues, such as [{sup 123}I]meta-iodobenzylguanidine, [{sup 11}C]meta-hydroxyephedrine, [{sup 18}F]fluorometaraminol, [{sup 11}C]phenylephrine and meta-[{sup 76}Br]bromobenzylguanidine. Resistance to metabolism by monoamine oxidase and catechol-O-methyl transferase simplifies the myocardial kinetics of the second group. Both groups of compounds are excellent agents for an overall assessment of sympathetic innervation. Biomathematical modelling of tracer kinetics is complicated by the complexity of the steps governing neuronal uptake, retention and release of these agents as well as by their high neuronal affinity, which leads to partial flow dependence of uptake. Mapping of cardiac parasympathetic neurones is limited by a low density and focal distribution pattern of these neurones in myocardium. Available tracers are derivatives of vesamicol, a molecule that binds to a receptor associated with the vesicular acetylcholine transporter. Compounds like (-)-[{sup 18}F]fluoroethoxybenzovesamicol display a high degree of non-specific binding in myocardium which restricts their utility

  18. Neurohumoral indicators of efficacy radiofrequency cardiac denervation

    Energy Technology Data Exchange (ETDEWEB)

    Evtushenko, A. V., E-mail: ave@cardio-tomsk.ru; Evtushenko, V. V. [National Research Tomsk State University, Tomsk (Russian Federation); Federal State Budgetary Scientific Institution “Research Institute for Cardiology”, Tomsk (Russian Federation); Saushkina, Yu. V.; Gusakova, A. M.; Suslova, T. E.; Dymbrylova, O. N.; Smyshlyaev, K. A.; Kurlov, I. O. [Federal State Budgetary Scientific Institution “Research Institute for Cardiology”, Tomsk (Russian Federation); Lishmanov, Yu. B.; Anfinogenova, Ya. D. [National Research Tomsk Polytechnic University, Tomsk (Russian Federation); Federal State Budgetary Scientific Institution “Research Institute for Cardiology”, Tomsk (Russian Federation); Sergeevichev, D. S. [Academician E.N. Meshalkin State Research Institute of Circulation Pathology, Novosibirsk (Russian Federation); Bykov, A. N.; Syryamkin, V. I.; Kistenev, Yu. V. [National Research Tomsk State University, Tomsk (Russian Federation); Lotkov, A. I. [Institute of Strength Physics and Materials Science of the Siberian Branch of the RAS, Tomsk (Russian Federation); Pokushalov, E. A.

    2015-11-17

    In this study, we compared pre- and postoperative parameters of the cardiac sympathetic innervation. The aim of the study was to examine the approaches to evaluating the quality of radiofrequency (RF)-induced cardiac denervation by using non-invasive and laboratory methods. The study included 32 people with long-lasting persistent atrial fibrillation (AF). The patients were divided into 2 groups according to the objectives of the study: group 1 (main) - 21 patients with mitral valve diseases, which simultaneously with radiofrequency ablation (RFA) AF carried out on the effects of the paraganglionic nervous plexuses by C. Pappone (2004) and N. Doll (2008) schemes. The second group (control) contained 11 patients with heart diseases in sinus rhythm (the RF denervation not been performed). All patients, who underwent surgical treatment, were received examination of cardiac sympathetic tone by using {sup 123}I-MIBG. All of them made blood analysis from ascending aorta and coronary sinus to determine the level of norepinephrine and its metabolites before and after cardiac denervation. Data of radionuclide examination are correlating with laboratory data.

  19. Neurohumoral indicators of efficacy radiofrequency cardiac denervation

    Science.gov (United States)

    Evtushenko, A. V.; Evtushenko, V. V.; Saushkina, Yu. V.; Lishmanov, Yu. B.; Pokushalov, E. A.; Sergeevichev, D. S.; Gusakova, A. M.; Suslova, T. E.; Dymbrylova, O. N.; Bykov, A. N.; Syryamkin, V. I.; Kistenev, Yu. V.; Anfinogenova, Ya. D.; Smyshlyaev, K. A.; Lotkov, A. I.; Kurlov, I. O.

    2015-11-01

    In this study, we compared pre- and postoperative parameters of the cardiac sympathetic innervation. The aim of the study was to examine the approaches to evaluating the quality of radiofrequency (RF)-induced cardiac denervation by using non-invasive and laboratory methods. The study included 32 people with long-lasting persistent atrial fibrillation (AF). The patients were divided into 2 groups according to the objectives of the study: group 1 (main) - 21 patients with mitral valve diseases, which simultaneously with radiofrequency ablation (RFA) AF carried out on the effects of the paraganglionic nervous plexuses by C. Pappone (2004) and N. Doll (2008) schemes. The second group (control) contained 11 patients with heart diseases in sinus rhythm (the RF denervation not been performed). All patients, who underwent surgical treatment, were received examination of cardiac sympathetic tone by using 123I-MIBG. All of them made blood analysis from ascending aorta and coronary sinus to determine the level of norepinephrine and its metabolites before and after cardiac denervation. Data of radionuclide examination are correlating with laboratory data.

  20. Effects of adding intravenous nicorandil to standard therapy on cardiac sympathetic nerve activity and myocyte dysfunction in patients with acute decompensated heart failure

    Energy Technology Data Exchange (ETDEWEB)

    Kasama, Shu [Gunma University Graduate School of Medicine, Department of Medicine and Biological Science (Cardiovascular Medicine), Maebashi, Gunma (Japan); Cardiovascular Hospital of Central Japan (Kitakanto Cardiovascular Hospital), Department of Cardiovascular Medicine, Gunma (Japan); Toyama, Takuji; Funada, Ryuichi; Takama, Noriaki; Koitabashi, Norimichi; Kurabayashi, Masahiko [Gunma University Graduate School of Medicine, Department of Medicine and Biological Science (Cardiovascular Medicine), Maebashi, Gunma (Japan); Ichikawa, Shuichi [Cardiovascular Hospital of Central Japan (Kitakanto Cardiovascular Hospital), Department of Cardiovascular Medicine, Gunma (Japan); Suzuki, Yasuyuki; Matsumoto, Naoya [Nihon University School of Medicine, Department of Cardiology, Tokyo (Japan); Sato, Yuichi [Health Park Clinic, Department of Imaging, Takasaki, Gunma (Japan)

    2015-04-01

    Nicorandil, an adenosine triphosphate-sensitive potassium channel opener, improves cardiac sympathetic nerve activity (CSNA) in ischemic heart disease or chronic heart failure. However, its effects on CSNA and myocyte dysfunction in acute heart failure (AHF) remain unclear. We investigated the effects of adding intravenous nicorandil to standard therapy on CSNA and myocyte dysfunction in AHF. We selected 70 patients with mild to moderate nonischemic AHF who were treated with standard conventional therapy soon after admission. Thirty-five patients were assigned to additionally receive intravenous nicorandil (4-12 mg/h; group A), whereas the remaining patients continued their current drug regimen (group B). Delayed total defect score (TDS), delayed heart to mediastinum count (H/M) ratio, and washout rate (WR) were determined by {sup 123}I-metaiodobenzylguanidine (MIBG) scintigraphy within 3 days of admission and 4 weeks later. High sensitivity troponin T (hs-TnT) level was also measured at the same time points. After treatment, MIBG scintigraphic parameters significantly improved in both groups. However, the extent of the changes in these parameters in group A significantly exceeded the extent of the changes in group B [TDS -11.3 ± 4.3 in group A vs -4.0 ± 6.0 in group B (p < 0.01); H/M ratio 0.31 ± 0.16 vs 0.14 ± 0.16 (p < 0.01); WR -13.8 ± 7.8 % vs -6.1 ± 8.9 % (p < 0.01)]. The hs-TnT level decreased significantly from 0.052 ± 0.043 to 0.041 ± 0.033 ng/ml (p < 0.05) in group A, but showed no significant change in group B. Moreover, in both groups, no relationships between the extent of changes in MIBG parameters and hs-TnT level were observed. Adding intravenous nicorandil to standard therapy provides additional benefits for CSNA and myocyte dysfunction over conventional therapy alone in AHF patients. Furthermore, the mechanisms of improvement in CSNA and myocyte dysfunction after nicorandil treatment in AHF patients were distinct. (orig.)

  1. Mechanism of relation among heart meridian, referred cardiac pain and heart

    Institute of Scientific and Technical Information of China (English)

    RONG; Peijing(荣培晶); ZHU; Bing(朱兵)

    2002-01-01

    It has been demonstrated that an important clinical phenomenon often associated with visceral diseases is the referred pain to somatic structures, especially to the body areaof homo-segmental innervation. It is interesting that the somatic foci of cardiac referred pain wereoften and mainly distributed along the heart meridian (HM), whereas the acupoints of HM havebeen applied to treat cardiac disease since ancient times. The purpose of this study was to inves-tigate the neural relationship between the cardiac referred pain and the heart meridian.Fluorescent triple-labeling was injected into the pericardium, some acupoints of HM and lung me-ridian (LM, for control). The responses of the left cardiac sympathetic nerve and of the EMG in left HM and LM were electrophysiologically studied, when the electrical stimuli were applied to the acupoints of left HM and to the left cardiac sympathetic nerve. More double-labeled neurons in HM-heart, not in LM-heart, were observed in the ipsilateral dorsal root ganglia of the spinal segments C8-T3. Electric stimulation of the acupoints of left HM was able to elicit more responses of left cardiac sympathetic nerve than that of the LM-acupoints. Electric stimulation of the left cardiac sympathetic nerve resulted in stronger activities of EMG-response in the acupoints of left HM than in LM-acupoints. We conclude that double-labeling study has provided direct evidence for the existence of dichotomizing afferent fibers that supply both the pericardium and HM. Electrophysiological results show that HM is more closely related functionally to heart. These findings provide a possible morphological and physiological explanation for the referred cardiac pain and HM-heart interrelation.

  2. Iodine-123 metaiodobenzylguanidine imaging of the heart in idiopathic congestive cardiomyopathy and cardiac transplants

    Energy Technology Data Exchange (ETDEWEB)

    Glowniak, J.V.; Turner, F.E.; Gray, L.L.; Palac, R.T.; Lagunas-Solar, M.C.; Woodward, W.R.

    1989-07-01

    Iodine-123 metaiodobenzylguanidine ((/sup 123/I)MIBG) is a norepinephrine analog which can be used to image the sympathetic innervation of the heart. In this study, cardiac imaging with (/sup 123/I)MIBG was performed in patients with idiopathic congestive cardiomyopathy and compared to normal controls. Initial uptake, half-time of tracer within the heart, and heart to lung ratios were all significantly reduced in patients compared to normals. Uptake in lungs, liver, salivary glands, and spleen was similar in controls and patients with cardiomyopathy indicating that decreased MIBG uptake was not a generalized abnormality in these patients. Iodine-123 MIBG imaging was also performed in cardiac transplant patients to determine cardiac nonneuronal uptake. Uptake in transplants was less than 10% of normals in the first 2 hr and nearly undetectable after 16 hr. The decreased uptake of MIBG suggests cardiac sympathetic nerve dysfunction while the rapid washout of MIBG from the heart suggests increased cardiac sympathetic nerve activity in idiopathic congestive cardiomyopathy.

  3. Innervation changes induced by inflammation of the rat thoracolumbar fascia.

    Science.gov (United States)

    Hoheisel, U; Rosner, J; Mense, S

    2015-08-06

    Recently, the fascia innervation has become an important issue, particularly the existence of nociceptive fibers. Fascia can be a source of pain in several disorders such as fasciitis and non-specific low back pain. However, nothing is known about possible changes of the fascia innervation under pathological circumstances. This question is important, because theoretically pain from the fascia cannot only be due to increased nociceptor discharges, but also to a denser innervation of the fascia by nociceptive endings. In this histological study, an inflammation was induced in the thoracolumbar fascia (TLF) of rats and the innervation by various fiber types compared between the inflamed and intact TLF. Although the TLF is generally considered to have proprioceptive functions, no corpuscular proprioceptors (Pacini and Ruffini corpuscles) were found. To obtain quantitative data, the length of fibers and free nerve endings were determined in the three layers of the rat TLF: inner layer (IL, adjacent to the multifidus muscle), middle layer (ML) and outer layer (OL). The main results were that the overall innervation density showed little change; however, there were significant changes in some of the layers. The innervation density was significantly decreased in the OL, but this change was partly compensated for by an increase in the IL. The density of substance P (SP)-positive - presumably nociceptive - fibers was significantly increased. In contrast, the postganglionic sympathetic fibers were significantly decreased. In conclusion, the inflamed TLF showed an increase of presumably nociceptive fibers, which may explain the pain from a pathologically altered fascia. The meaning of the decreased innervation by sympathetic fibers is obscure at present. The lack of proprioceptive corpuscular receptors within the TLF does not preclude its role as a proprioceptive structure, because some of the free nerve endings may function as proprioceptors.

  4. Sympathetic neuroaxonal dystrophy in the aged rat pineal gland.

    Science.gov (United States)

    Schmidt, Robert E; Dorsey, Denise A; Parvin, Curtis A; Beaudet, Lucie N

    2006-10-01

    Dysfunction of circadian melatonin production by the pineal gland in aged humans and rats is thought to reflect the functional loss of its sympathetic innervation. Our ultrastructural neuropathologic studies of the sympathetic innervation of the pineal gland of aged (24 months old) Fischer-344 and Sprague-Dawley rats showed loss of nerve terminals as well as the development of neuroaxonal dystrophy (NAD), an ultrastructurally distinctive distal axonopathy, far in excess of that in young control rats. Immunolocalization of tyrosine hydroxylase confirmed the age-related loss of normal noradrenergic innervation and development of NAD. NAD was more frequent in aged female rats compared to males and was particularly severe in aged female Sprague-Dawley rats compared to Fischer-344 rats. Pineal NGF content was significantly increased or unchanged in female and male aged Fischer-344 rats, respectively, compared to young controls. The rat pineal is a sensitive experimental model for the quantitative ultrastructural examination of age-related neuropathological changes in nerve terminals of postganglionic noradrenergic sympathetic axons, changes which may reflect similar changes in the diffusely distributed sympathetic innervation of other targeted endorgans.

  5. Aliskiren ameliorates sympathetic nerve sprouting and suppresses the inducibility of ventricular tachyarrhythmia in postinfarcted rat heart

    Institute of Scientific and Technical Information of China (English)

    JIA Yin-yu; BAO Zhi-wei; WEI Mei-fang; ZHU Jian-hua; GUI Le

    2013-01-01

    Background Aliskiren is an oral renin inhibitor,which inhibits the first rate limiting step in the renin angiotensin aldosterone system.In this study,sympathetic nerve sprouting and the inducibility of ventricular fibrillation after aliskiren treatment in myocardial infarction were investigated.Methods Male Sprague Dawley rats after coronary artery ligation were randomly allocated to four groups:angiotensin converting enzyme inhibitor enalapril,angiotensin receptor blocker valsartan,β adrenergic receptor blocker carvedilol and rennin inhibitor aliskiren treatment for six weeks.Electrophysiological study,histological examination and Western blotting were performed.Results The plasma norepinephrine level and sympathetic nerve innervation significantly increased in treated infarcted rats compared to untreated rats.Aliskiren treatment reduced the sympathetic nerve innervations after myocardial infarction.There is no significant difference in sympathetic nerve innervations after myocardial infarction among the enalapril,valsartan,carvediloand or aliskiren treated groups.Programmed electrical stimulation study showed that inducible ventricular arrhythmia was reduced,ventricular fibrillation threshold was increased and ventricular effective refractory period was prolonged in enalapril,valsartan,carvedilol and aliskiren treated infarcted rats compared to untreated infarcted rats.Cardiomyocytic apoptosis in infarcted region was significantly decreased in enalapril,valsartan,carvedilol and aliskiren treated infarcted rats.Conclusions Aliskiren ameliorated cardiomyocytic apoptosis,attenuated the sympathetic nerve innervations and reduced the vulnerability of ventricular arrhythmias after myocardial infarction.Enalapril,valsartan and carvedilol have similar effects as aliskiren on cardiomyocytic apoptosis,sympathetic nerve innervations and vulnerability of ventricular arrhythmias after myocardial infarction.

  6. [The adrenergic innervation of the normal rat uterus and during pregnancy].

    Science.gov (United States)

    Rakitskaia, V V; Chudinov, Iu V; Shaliapina, V G

    1990-09-01

    Histochemical analysis revealed that, normally, the main amount of adrenergic fibers in the rat uterus is connected with vascular innervation. The amount of neural elements projecting to the muscle cells in insignificant. In pregnancy, the amount of fibers with the specific fluorescence decreases and they completely disappear from the myometrium in parturient rats. Biochemical analysis corroborated the finding that the noradrenaline level is considerably decreased at the time in sympathetic neurons innervating the uterus thus leading to a physiological "desympathization" of the organ.

  7. Sympathetic nerve damage and restoration after ischemia-reperfusion injury as assessed by {sup 11}C-hydroxyephedrine

    Energy Technology Data Exchange (ETDEWEB)

    Werner, Rudolf A.; Higuchi, Takahiro [University of Wuerzburg, Department of Nuclear Medicine, Wuerzburg (Germany); University of Wuerzburg, Comprehensive Heart Failure Center, Wuerzburg (Germany); Maya, Yoshifumi [University of Wuerzburg, Department of Nuclear Medicine, Wuerzburg (Germany); Nihon Medi-Physics Co., Ltd., Research Centre, Chiba (Japan); Rischpler, Christoph [Technische Universitaet Muenchen, Department of Nuclear Medicine, Klinikum rechts der Isar, Muenchen (Germany); Javadi, Mehrbod S. [Johns Hopkins University, Division of Nuclear Medicine, Russell H. Morgan Department of Radiology, Baltimore, MD (United States); Fukushima, Kazuhito [Hyogo College of Medicine, Department of Radiology, Hyogo (Japan); Lapa, Constantin [University of Wuerzburg, Department of Nuclear Medicine, Wuerzburg (Germany); Herrmann, Ken [University of Wuerzburg, Department of Nuclear Medicine, Wuerzburg (Germany); David Geffen School of Medicine at UCLA, Department of Molecular and Medical Pharmacology, Los Angeles, CA (United States)

    2016-02-15

    An altered state of the cardiac sympathetic nerves is an important prognostic factor in patients with coronary artery disease. The aim of this study was to investigate regional sympathetic nerve damage and restoration utilizing a rat model of myocardial transient ischemia and a catecholamine analog PET tracer, {sup 11}C-hydroxyephedrine ({sup 11}C-HED). Transient myocardial ischemia was induced by coronary occlusion for 20 min and reperfusion in male Wistar rats. Dual-tracer autoradiography was performed subacutely (7 days) and chronically (2 months) after ischemia, and in control rats without ischemia using {sup 11}C-HED as a marker of sympathetic innervation and {sup 201}TI for perfusion. Additional serial in vivo cardiac {sup 11}C-HED and {sup 18}F-FDG PET scans were performed in the subacute and chronic phases after ischemia. After transient ischemia, the {sup 11}C-HED uptake defect areas in both the subacute and chronic phases were clearly larger than the perfusion defect areas in the midventricular wall. The subacute {sup 11}C-HED uptake defect showed a transmural pattern, whereas uptake recovered in the subepicardial portion in the chronic phase. Tyrosine hydroxylase antibody nerve staining confirmed regional denervation corresponding to areas of decreased {sup 11}C-HED uptake. Serial in vivo PET imaging visualized reductions in the area of the {sup 11}C-HED uptake defects in the chronic phase consistent with autoradiography and histology. Higher susceptibility of sympathetic neurons compared to myocytes was confirmed by a larger {sup 11}C-HED defect with a corresponding histologically identified region of denervation. Furthermore, partial reinnervation was observed in the chronic phase as shown by recovery of subepicardial {sup 11}C-HED uptake. (orig.)

  8. Arrhythmia and cardiac defects are a feature of spinal muscular atrophy model mice.

    Science.gov (United States)

    Heier, Christopher R; Satta, Rosalba; Lutz, Cathleen; DiDonato, Christine J

    2010-10-15

    Proximal spinal muscular atrophy (SMA) is the leading genetic cause of infant mortality. Traditionally, SMA has been described as a motor neuron disease; however, there is a growing body of evidence that arrhythmia and/or cardiomyopathy may present in SMA patients at an increased frequency. Here, we ask whether SMA model mice possess such phenotypes. We find SMA mice suffer from severe bradyarrhythmia characterized by progressive heart block and impaired ventricular depolarization. Echocardiography further confirms functional cardiac deficits in SMA mice. Additional investigations show evidence of both sympathetic innervation defects and dilated cardiomyopathy at late stages of disease. Based upon these data, we propose a model in which decreased sympathetic innervation causes autonomic imbalance. Such imbalance would be characterized by a relative increase in the level of vagal tone controlling heart rate, which is consistent with bradyarrhythmia and progressive heart block. Finally, treatment with the histone deacetylase inhibitor trichostatin A, a drug known to benefit phenotypes of SMA model mice, produces prolonged maturation of the SMA heartbeat and an increase in cardiac size. Treated mice maintain measures of motor function throughout extended survival though they ultimately reach death endpoints in association with a progression of bradyarrhythmia. These data represent the novel identification of cardiac arrhythmia as an early and progressive feature of murine SMA while providing several new, quantitative indices of mouse health. Together with clinical cases that report similar symptoms, this reveals a new area of investigation that will be important to address as we move SMA therapeutics towards clinical success.

  9. Innervation of ectopic endometrium in a rat model of endometriosis.

    Science.gov (United States)

    Berkley, Karen J; Dmitrieva, Natalia; Curtis, Kathleen S; Papka, Raymond E

    2004-07-27

    Endometriosis (ENDO) is a disorder in which vascularized growths of endometrial tissue occur outside the uterus. Its symptoms include reduced fertility and severe pelvic pain. Mechanisms that maintain the ectopic growths and evoke symptoms are poorly understood. One factor not yet considered is that the ectopic growths develop their own innervation. Here, we tested the hypothesis that the growths develop both an autonomic and a sensory innervation. We used a rat model of surgically induced ENDO whose growths mimic those in women. Furthermore, similar to women with ENDO, such rats exhibit reduced fertility and increased pelvic nociception. The ENDO was induced by autotransplanting, on mesenteric cascade arteries, small pieces of uterus that formed vascularized cysts. The cysts and healthy uterus were harvested from proestrous rats and immunostained using the pan-neuronal marker PGP9.5 and specific markers for calcitonin gene-related peptide (CGRP) (sensory C and A delta fibers), substance P (SP) (sensory C and A delta fibers) and vesicular monoamine transporter (sympathetic fibers). Cysts (like the uterus) were robustly innervated, with many PGP9.5-stained neurites accompanying blood vessels and extending into nearby luminal epithelial layers. CGRP-, SP-, and vesicular monoamine transporter-immunostained neurites also were observed, with CGRP and SP neurites extending the furthest into the cyst lining. These results demonstrate that ectopic endometrial growths develop an autonomic and sensory innervation. This innervation could contribute not only to symptoms associated with ENDO but also to maintenance of the ectopic growths.

  10. [Role of the sympathetic nervous system in vasovagal syncope and rationale for beta-blockers and norepinephrine transporter inhibitors].

    Science.gov (United States)

    Márquez, Manlio F; Gómez-Flores, Jorge Rafael; González-Hermosillo, Jesús A; Ruíz-Siller, Teresita de Jesús; Cárdenas, Manuel

    2016-12-29

    Vasovagal or neurocardiogenic syncope is a common clinical situation and, as with other entities associated with orthostatic intolerance, the underlying condition is a dysfunction of the autonomic nervous system. This article reviews various aspects of vasovagal syncope, including its relationship with orthostatic intolerance and the role of the autonomic nervous system in it. A brief history of the problem is given, as well as a description of how the names and associated concepts have evolved. The response of the sympathetic system to orthostatic stress, the physiology of the baroreflex system and the neurohumoral changes that occur with standing are analyzed. Evidence is presented of the involvement of the autonomic nervous system, including studies of heart rate variability, microneurography, cardiac innervation, and molecular genetic studies. Finally, we describe different studies on the use of beta-blockers and norepinephrine transporter inhibitors (sibutramine, reboxetine) and the rationality of their use to prevent this type of syncope.

  11. Evaluation of cardiac blood blow, metabolism and sympathetic nerve function in patients with cardiac failure using PET and SPECT. Prognostic diagnosis based on the analysis of aggravating factors of the disease

    Energy Technology Data Exchange (ETDEWEB)

    Ishida, Yoshio; Shimozu, Junko; Yasumura, Yoshio; Nagatani, Kenzo; Miyatake, Kunio [National Cardiovascular Center, Suita, Osaka (Japan)

    1998-02-01

    Focusing on the failure of energy metabolism, which is assumed to be attributed to the cardiac muscle disorder of a patient with cardiac failure, the characteristics and diagnostic significance of the metabolic disorders of cadiac muscles were investigated in those patients. The diagnostic efficacy of {beta}-methyl iodophenyl pentadecanoic acid (BMIPP) which is a imaging agent for lipid metabolism in the cardiac muscle was assessed in the clinical states of cardiac failure due to pulmonary hypertension. Even if there was a considerable increase in the mean pulmonary arterial pressure (mPAP), the initial accumulation of BMIPP linearly increased, similarly to the increase in the accumulation of MIBI, a blood flow agent. The initial accumulation of BMIPP was thought to reflect a thicken cardiac muscle and/or increased blood flow. Also, its washing-out rate was suggested to be usable as an clinical indicator to estimate the loading of ventricular pressure. (M.N.)

  12. Sympathetic nervous system and chronic renal failure.

    Science.gov (United States)

    Boero, R; Pignataro, A; Ferro, M; Quarello, F

    2001-01-01

    The aim of this work was to review evidence on the role of the sympathetic nervous system (SNS) in chronic renal failure (CRF). Three main points are discussed: 1) SNS and pathogenesis of arterial hypertension; 2) SNS and cardiovascular risk; 3) implication of SNS in arterial hypotension during hemodialysis. Several lines of evidence indicate the presence of a sympathetic hyperactivity in CRF, and its relationship with arterial hypertension. It is suggested that diseased kidneys send afferent nervous signals to central integrative sympathetic nuclei, thus contributing to the development and maintenance of arterial hypertension. The elimination of these impulses with nephrectomy could explain the concomitant reduction of blood pressure. Several experiments confirmed this hypothesis. Regarding SNS and cardiovascular risk, some data suggest that reduced heart rate variability identifies an increased risk for both all causes and sudden death, independently from other recognized risk factors. Symptomatic hypotension is a common problem during hemodialysis treatment, occurring in approximately 20-30% of all hemodialysis sessions and is accompanied by acute withdrawal of sympathetic activity, vasodilation and relative bradicardia. This reflex is thought to be evoked by vigorous contraction of a progressively empty left ventricle, activating cardiac mechanoceptors. This inhibits cardiovascular centers through vagal afferents, and overrides the stimulation by baroreceptor deactivation. Alternative explanations include cerebral ischemia and increased production of nitric oxide, which inhibit central sympathetic activity. It is hoped that therapies aimed at modulating sympathetic nerve activity in patients with CRF will ameliorate their prognosis and quality of life.

  13. Autonomic innervation of the heart. Role of molecular imaging

    Energy Technology Data Exchange (ETDEWEB)

    Slart, Riemer H.J.A; Elsinga, Philip H. [Univ. Medical Center Groningen (Netherlands). Nuclear Medicine and Molecular Imaging; Tio, Rene A. [Univ. Medical Center Groningen (Netherlands). Thorax Center Cardiology; Schwaiger, Markus (ed.) [Technische Univ. Muenchen Klinikum Rechts der Isar (Germany). Nuklearmedizinische Klinik

    2015-03-01

    Reviews in detail the value of SPECT-CT and PET-CT in the imaging of cardiac innervation. Details the role of imaging in a range of conditions and diseases. Includes important background on pathophysiology, tracers, radiopharmaceutical production, and kinetic modeling software. This book explains in detail the potential value of the hybrid modalities, SPECT-CT and PET-CT, in the imaging of cardiac innervation in a wide range of conditions and diseases, including ischemic heart disease, diabetes mellitus, heart failure, amyloidosis, heart transplantation, and ventricular arrhythmias. Imaging of the brain-heart axis in neurodegenerative disease and stress and of cardiotoxicity is also discussed. The roles of the various available tracers are fully considered, and individual chapters address radiopharmaceutical development under GMP, imaging physics, and kinetic modeling software. Highly relevant background information is included on the autonomic nervous system of the heart and its pathophysiology, and in addition future perspectives are discussed. Awareness of the importance of autonomic innervation of the heart for the optimal management of cardiac patients is growing, and there is an evident need for objective measurement techniques or imaging modalities. In this context, Autonomic Innervation of the Heart will be of wide interest to clinicians, researchers, and industry.

  14. Adaptive plasticity of vaginal innervation in term pregnant rats.

    Science.gov (United States)

    Liao, Zhaohui; Smith, Peter G

    2011-12-01

    Changes in reproductive status place varied functional demands on the vagina. These include receptivity to male intromission and sperm transport in estrus, barrier functions during early pregnancy, and providing a conduit for fetal passage at parturition. Peripheral innervation regulates vaginal function, which in turn may be influenced by circulating reproductive hormones. We assessed vaginal innervation in diestrus and estrus (before and after the estrous cycle surge in estrogen), and in the early (low estrogen) and late (high estrogen) stages in pregnancy. In vaginal sections from cycling rats, axons immunoreactive for the pan-neuronal marker protein gene product 9.5 (PGP 9.5) showed a small reduction at estrus relative to diestrus, but this difference did not persist after correcting for changes in target size. No changes were detected in axons immunoreactive for tyrosine hydroxylase (sympathetic), vesicular acetylcholine transporter (parasympathetic), or calcitonin gene-related peptide and transient receptor potential vanilloid type 1 (TRPV-1; sensory nociceptors). In rats at 10 days of pregnancy, innervation was similar to that observed in cycling rats. However, at 21 days of pregnancy, axons immunoreactive for PGP 9.5 and each of the subpopulation-selective markers were significantly reduced both when expressed as percentage of sectional area or after correcting for changes in target size. Because peripheral nerves regulate vaginal smooth muscle tone, blood flow, and pain sensitivity, reductions in innervation may represent important adaptive mechanisms facilitating parturition.

  15. [Adrenergic innervation and norepinephrine content in postnatal rat uterus].

    Science.gov (United States)

    Itoh, M

    1983-03-01

    Using fluorescent histochemical method and high performance liquid chromatography with electrochemical detector, we investigated adrenergic innervation and norepinephrine content in the rat uterus in the process of the growth. The adrenergic nerve terminals in the rat uterus developed with age and reached to adult level at 7 weeks of age after birth, although the short adrenergic ganglionic cells and small intense fluorescent cells were present even at birth. Norepinephrine content per organ also increased with age and reached to adult level at 10 weeks of age after birth, while NE content per gram wet tissue weight had a peak in 3-day-old rat uterus. These morphological and biochemical data revealed that the sympathetic nervous system in rat uterus matures in 7 to 10 weeks after birth, while the short adrenergic nervous system is accomplished in earlier stage. The maturation of adrenergic innervation in the uterus was considerably later than in the other organs of rat and developed with the sexual maturation.

  16. Spinal Cord Injury-Induced Dysautonomia via Plasticity in Paravertebral Sympathetic Postganglionic

    Science.gov (United States)

    2015-10-01

    preganglionic divergence and convergence onto thoracic chain SPNs was previously examined in guinea pig 6,7. We began to undertake similar studies in the...autonomic nervous system 18, 195-205 (1987). 6 Blackman, J. G. & Purves, R. D. Intracellular recordings from ganglia of the thoracic sympathetic chain of...the guinea - pig . J Physiol. 203, 173-198. (1969). 7 Lichtman, J. W., Purves, D. & Yip, J. W. Innervation of sympathetic neurones in the guinea - pig

  17. Protein kinase C pathway on cardiac sympathetic nerve neuroplasticity and myocardial interstitial remodeling%心脏交感神经和心肌间质重塑的共同通路——蛋白激酶C途径

    Institute of Scientific and Technical Information of China (English)

    李贺; 周欣; 王坷; 赵丽霞; 王志宏; 李玉明

    2011-01-01

    Cardiac sympathetic nerve and myocardial interstitium play important roles for preservation of heart function. Different extent of the interstitial remodeling and neuroplasticity commonly occur in many kinds of cardiovascular diseases. The abnormalities interact and contribute to progression and worsening of the diseases. There is accumulating evidence suggesting that protein kinase C activation as a regulator involves in and mediates interaction between the neuroplasticity and remodeling under such conditions, which plays a critical role in the nerve dysfunction and myocardial fibrosis.%心脏交感神经和心肌间质对维持正常心功能有重要作用.心血管患病时,两者均发生不同程度的重塑,并互相影响,这些变化对疾病进展发挥重要影响.研究证据显示,两者间的相互作用可能通过蛋白激酶C介导,对交感神经功能异常和心肌纤维化都发挥重要作用.

  18. Chronic cardiac pressure overload induces adrenal medulla hypertrophy and increased catecholamine synthesis.

    Science.gov (United States)

    Schneider, Johanna; Lother, Achim; Hein, Lutz; Gilsbach, Ralf

    2011-06-01

    Increased activity of the sympathetic system is an important feature contributing to the pathogenesis and progression of chronic heart failure. While the mechanisms and consequences of enhanced norepinephrine release from sympathetic nerves have been intensely studied, the role of the adrenal gland in the development of cardiac hypertrophy and progression of heart failure is less well known. Thus, the aim of the present study was to determine the effect of chronic cardiac pressure overload in mice on adrenal medulla structure and function. Cardiac hypertrophy was induced in wild-type mice by transverse aortic constriction (TAC) for 8 weeks. After TAC, the degree of cardiac hypertrophy correlated significantly with adrenal weight and adrenal catecholamine storage. In the medulla, TAC caused an increase in chromaffin cell size but did not result in chromaffin cell proliferation. Ablation of chromaffin α(2C)-adrenoceptors did not affect adrenal weight or epinephrine synthesis. However, unilateral denervation of the adrenal gland completely prevented adrenal hypertrophy and increased catecholamine synthesis. Transcriptome analysis of microdissected adrenal medulla identified 483 up- and 231 downregulated, well-annotated genes after TAC. Among these genes, G protein-coupled receptor kinases 2 (Grk2) and 6 and phenylethanolamine N-methyltransferase (Pnmt) were significantly upregulated by TAC. In vitro, acetylcholine-induced Pnmt and Grk2 expression as well as enhanced epinephrine content was prevented by inhibition of nicotinic acetylcholine receptors and Ca(2+)/calmodulin-dependent signaling. Thus, activation of preganglionic sympathetic nerves innervating the adrenal medulla plays an essential role in inducing adrenal hypertrophy, enhanced catecholamine synthesis and induction of Grk2 expression after cardiac pressure overload.

  19. Morphology of sympathetic chain in Saguinus niger

    Directory of Open Access Journals (Sweden)

    MARINA P.E. PINTO

    2013-03-01

    Full Text Available Saguinus niger popularly known as Sauim, is a Brazilian North primate. Sympathetic chain investigation would support traumatic and/or cancer diagnosis which are little described in wild animals. The aim of this study was to describe the morphology and distribution of sympathetic chain in order to supply knowledge for neurocomparative research. Three female young animals that came death by natural causes were investigated. Animals were fixed in formaldehyde 10% and dissected along the sympathetic chain in neck, thorax and abdomen. Cranial cervical ganglion was located at the level of carotid bifurcation, related to carotid internal artery. In neck basis the vagosympathetic trunk divides into the sympathetic trunk and the parasympathetic vagal nerve. Sympathetic trunk ran in dorsal position and originated the stellate ganglia, formed by the fusion of caudal cervical and first thoracic ganglia. Vagal trunk laid ventrally to heart and formed the cardiac plexus. In abdomen, on the right side, were found the celiac ganglion and cranial mesenteric ganglion; in the left side these ganglia were fusioned into the celiac-mesenteric ganglion displaced closely to the celiac artery. In both sides, the caudal mesenteric ganglion was located near to the caudal mesenteric artery.

  20. Vascular Mural Cells Promote Noradrenergic Differentiation of Embryonic Sympathetic Neurons.

    Science.gov (United States)

    Fortuna, Vitor; Pardanaud, Luc; Brunet, Isabelle; Ola, Roxana; Ristori, Emma; Santoro, Massimo M; Nicoli, Stefania; Eichmann, Anne

    2015-06-23

    The sympathetic nervous system controls smooth muscle tone and heart rate in the cardiovascular system. Postganglionic sympathetic neurons (SNs) develop in close proximity to the dorsal aorta (DA) and innervate visceral smooth muscle targets. Here, we use the zebrafish embryo to ask whether the DA is required for SN development. We show that noradrenergic (NA) differentiation of SN precursors temporally coincides with vascular mural cell (VMC) recruitment to the DA and vascular maturation. Blocking vascular maturation inhibits VMC recruitment and blocks NA differentiation of SN precursors. Inhibition of platelet-derived growth factor receptor (PDGFR) signaling prevents VMC differentiation and also blocks NA differentiation of SN precursors. NA differentiation is normal in cloche mutants that are devoid of endothelial cells but have VMCs. Thus, PDGFR-mediated mural cell recruitment mediates neurovascular interactions between the aorta and sympathetic precursors and promotes their noradrenergic differentiation.

  1. Regulation of bile duct motility by vagus and sympathetic nerves in the pigeon.

    Directory of Open Access Journals (Sweden)

    Neya,Toshiaki

    1990-04-01

    Full Text Available Effects of stimulation of the vagus and sympathetic nerves on bile duct peristalses were studied in pigeons anesthetized with urethane. Vagus stimulation increased the frequency of peristalses. Atropine, hexamethonium and tetrodotoxin abolished this excitatory effect. After atropine, inhibition of peristalses sensitive to tetrodotoxin was produced. Stimulation of sympathetic area in the spinal cord inhibited peristalses. Propranolol converted this effect into an excitatory one, which was abolished by phentolamine. The results suggest that vagal and sympathetic innervations of the bile duct in pigeons are similar to those of the sphincter of Oddi in mammalian species.

  2. Innervation of ''painful'' lumbar discs

    NARCIS (Netherlands)

    Coppes, MH; Marani, E; Thomeer, RTWM; Groen, GJ

    1997-01-01

    Study Design. The authors investigated the innervation of discographically confirmed degenerated and ''painful'' human intervertebral discs. Objective. To determine the type and distribution patterns of nerve fibers present in degenerated human intervertebral discs. Summary of Background Data. The i

  3. Exogenous nerve growth factor supplementation elevates myocardial immunoreactivity and attenuates cardiac remodeling in pressure-overload rats

    Institute of Scientific and Technical Information of China (English)

    Bing He; and Yuming Li; Fan Ye; Xin Zhou; He Li; Xiaoqing Xun; Xiaoqing Ma; Xudong Liu; Zhihong Wang; Pengxiao Xu

    2012-01-01

    It is postulated that supplementation of exogenous nerve growth factor (NGF) might mediate improvement of the cardiac sympathetic nerve function in heart failure (HF).Local intramuscular injection of NGF near the cardiac sympathetic ganglia could influence the innervation pattern,norepinephrine transporter (NET) gene expression,and improve the cardiac remodeling in experimental HF animals.In this study,we injected NGF into the scalenus medius muscles of Sprague-Dawley rats with abdominal aortic constriction (AC).The nerve innervated pattern,left ventricular morphology,and function following injection in rats with AC were investigated respectively by immunohistochemistry and echocardiography.Levels of mRNA expression of NET,growth associated protein 43 (GAP 43),NGF and its receptors TrkA and p75NTR,and brain natriuretic peptide (BNP) were measured by realtime polymerase chain reaction.The results showed that myocardial NGF mRNA levels were comparable in rats with AC.Short-term supplementation of exogenous NGF raised the myocardial NGF immunoreactivity,but did not cause hyperinnervation and NET mRNA upregulation in the AC rats.Furthermore,myocardial TrkA mRNA was found to be remarkably decreased and p75NTR mRNA was increased.Myocardial TrkA downregulation may play a beneficial effect for avoiding the hyperinnervation,and it is reasonable to postulate that p75NTR can function as an NGF receptor in the absence of TrkA.Interestingly,local NGF administration into the neck muscles near the ganglia could attenuate cardiac remodeling and downregulate BNP mRNA.These results suggest that exogenous NGF can reach the target tissue along the axons anterogradely,and improve the cardiac remodeling.

  4. Localization of the autonomic, somatic and sensory neurons innervating the cranial tibial muscle of the pig.

    Science.gov (United States)

    Botti, Maddalena; Gazza, Ferdinando; Ragionieri, Luisa; Minelli, Luisa Bo; Panu, Rino

    2011-01-01

    The location of sympathetic, somatic and sensory neurons projecting to the cranial tibial muscle of the pig hindlimb was studied with the neuronal non-transynaptic tracer Fast Blue. Additionally, the number and the size of these neurons were determinated. The Fast blue, randomly applied to the cranial tibial muscle belly of 3 pigs, labelled sympathetic neurons in the ipsilateral L5-S3 and contralateral S1 sympathetic trunk ganglia and in the prevertebral caudal mesenteric ganglia of both sides. The somatic motoneurons were identified in the ipsilateral ventral horn of the S1 segment of spinal cord, while the sensory neurons were located in the ipsilateral L7-S1 spinal ganglia. The diameter of the multipolar sympathetic neurons oscillated between 26 and 46 microm in the sympathetic trunk ganglia and between 18 and 42 microm in the caudal mesenteric ganglia. The size of the multipolar spinal motoneurons oscillated between 33 and 102 microm. The size of the pseudounipolar sensory neurons oscillated between 23 and 67 microm. In all ganglia, the labelled neurons were localized at random and did not show a somatotopic distribution. Our results document a conspicuous autonomic innervation projecting to the "classic" skeletal cranial tibial muscle. Probably this innervation is destined to the muscle vessels.

  5. Selective regulation of nerve growth factor expression in developing cutaneous tissue by early sensory innervation

    Directory of Open Access Journals (Sweden)

    Vizard Tom N

    2011-04-01

    Full Text Available Abstract Background In the developing vertebrate peripheral nervous system, the survival of sympathetic neurons and the majority of sensory neurons depends on a supply of nerve growth factor (NGF from tissues they innervate. Although neurotrophic theory presupposes, and the available evidence suggests, that the level of NGF expression is completely independent of innervation, the possibility that innervation may regulate the timing or level of NGF expression has not been rigorously investigated in a sufficiently well-characterized developing system. Results To address this important question, we studied the influence of innervation on the regulation of NGF mRNA expression in the embryonic mouse maxillary process in vitro and in vivo. The maxillary process receives its innervation from predominantly NGF-dependent sensory neurons of the trigeminal ganglion and is the most densely innervated cutaneous territory with the highest levels of NGF in the embryo. When early, uninnervated maxillary processes were cultured alone, the level of NGF mRNA rose more slowly than in maxillary processes cultured with attached trigeminal ganglia. In contrast to the positive influence of early innervation on NGF mRNA expression, the levels of brain-derived neurotrophic factor (BDNF mRNA and neurotrophin-3 (NT3 mRNA rose to the same extent in early maxillary processes grown with and without trigeminal ganglia. The level of NGF mRNA, but not BDNF mRNA or NT3 mRNA, was also significantly lower in the maxillary processes of erbB3-/- mice, which have substantially fewer trigeminal neurons than wild-type mice. Conclusions This selective effect of initial innervation on target field NGF mRNA expression provokes a re-evaluation of a key assertion of neurotrophic theory that the level of NGF expression is independent of innervation.

  6. Sympathetic hyperinnervation of the uterus in the estrogen receptor alpha knock-out mouse.

    Science.gov (United States)

    Zoubina, E V; Smith, P G

    2001-01-01

    Uterine innervation undergoes cyclical remodeling in the adult virgin rat. Previous studies showed that ovariectomy leads to increased uterine sympathetic nerve density, and this can be reduced by estrogen administration. However, the receptor mechanism by which estrogen modulates sympathetic innervation is unknown. The present study assessed the role of the estrogen receptor alpha in establishing levels of uterine innervation by comparing the nerve abundance in mice with a null mutation of the estrogen receptor alpha with those of the wild-type cycling mouse. Immunostaining for total uterine innervation using antibodies against the pan-neuronal marker protein gene product 9.5 showed that nerve numbers in normally cycling wild-type mice were high in diestrus when circulating estrogen is at its nadir, and low at estrus, coincident with high plasma estrogen. Uteri of the estrogen receptor alpha knock-out mice were smaller than those of wild-type mice, but even when corrected for differences in size, total innervation was 188% and 355% greater than that of wild-type mice at diestrus and estrus, respectively. This hyperinnervation is associated with increased numbers of nerves immunoreactive for the noradrenergic enzyme dopamine beta-hydroxylase, without obvious differences in those containing calcitonin gene-related peptide or the vesicular acetylcholine transporter. While estrogen supplementation of the ovariectomized wild-type mice significantly reduced total uterine innervation, neither ovariectomy nor estrogen supplementation affected uterine nerve density in estrogen receptor alpha knock-out mice.We conclude that estrogen acting through the estrogen receptor alpha determines the number of sympathetic nerve terminal branches within uterine smooth muscle target. In mice with low circulating estrogen, or high estrogen but lacking the functional estrogen receptor alpha, the uterus contains abundant sympathetic nerves, whereas estrogen acts via the estrogen receptor

  7. Immunopathology of sympathetic ophthalmia.

    Science.gov (United States)

    Marak, G E

    1976-01-01

    The long held notion that sympathetic ophthalmia represents an autoimmune reaction to uveal pigment is no longer tenable. Pigmentation influences the histopathologic picture of sympathetic ophthalmia but no evidence supports the role of uveal pigment as inciting antigen. Several recent studies have confirmed our initial report of the participation of cellular hypersensitivity to ocular tissues in the pathogenesis of this disease. Both clinical and experimental studies implicate retinal tissue as being more immunogenic than uveal antigens. The recent histopathologic observation that eosinophils concentrate near the choriocapillaris suggests that outer retina and retinal pigment epithelium should not be overlooked as a potential source of the stimulating antigen in sympathetic ophthalmia.

  8. Ovarian innervation develops before initiation of folliculogenesis in the rat.

    Science.gov (United States)

    Malamed, S; Gibney, J A; Ojeda, S R

    1992-10-01

    Sympathetic neurotransmitters have been shown to be present in the ovary of the rat during early postnatal development and to affect steroidogenesis before the ovary becomes responsive to gonadotropins, and before the first primordial follicles are formed. This study was undertaken to determine if development of the ovarian innervation is an event that antedates the initiation of folliculogenesis in the rat, Rattus norvegicus. Serial sections of postnatal ovaries revealed a negligible frequency of follicles 24 h after birth (about 1 primordial follicle per ovary). Twelve hours later there were about 500 follicles per ovary, a number that more than doubled to about 1300 during the subsequent 12 h, indicating that an explosive period of follicular differentiation occurs between the end of postnatal days 1 and 2. Electron microscopy demonstrated that before birth the ovaries are already innervated by fibers containing clear and dense-core vesicles. Immunohistochemistry performed on either fetal (day 19) or newborn (less than 15h after birth) ovaries showed the presence of catecholaminergic nerves, identified by their content of immunoreactive tyrosine hydroxylase (TH), the rate-limiting enzyme in catecholamine biosynthesis. While some of these fibers innervate blood vessels, others are associated with primordial ovarian cells, thereby suggesting their participation in non-vascular functions. Since prefollicular ovaries are insensitive to gonadotropins, the results suggest that the developing ovary becomes subjected to direct neurogenic influences before it acquires responsiveness to gonadotropins.

  9. Age-related changes in the innervation of the prostate gland: implications for prostate cancer initiation and progression.

    Science.gov (United States)

    White, Carl W; Xie, Jin Han; Ventura, Sabatino

    2013-01-01

    The adult prostate gland grows and develops under hormonal control while its physiological functions are controlled by the autonomic nervous system. The prostate gland receives sympathetic input via the hypogastric nerve and parasympathetic input via the pelvic nerve. In addition, the hypogastric and pelvic nerves also provide sensory inputs to the gland. This review provides a summary of the innervation of the adult prostate gland and describes the changes which occur with age and disease. Growth and development of the prostate gland is age dependent as is the occurrence of both benign prostate disease and prostate cancer. In parallel, the activity and influence of both the sympathetic and parasympathetic nervous system changes with age. The influence of the sympathetic nervous system on benign prostatic hyperplasia is well documented and this review considers the possibility of a link between changes in autonomic innervation and prostate cancer progression.

  10. Sprouted innervation into uterine transplants contributes to the development of hyperalgesia in a rat model of endometriosis.

    Science.gov (United States)

    McAllister, Stacy L; Dmitrieva, Natalia; Berkley, Karen J

    2012-01-01

    Endometriosis is an enigmatic painful disorder whose pain symptoms remain difficult to alleviate in large part because the disorder is defined by extrauteral endometrial growths whose contribution to pain is poorly understood. A rat model (ENDO) involves autotransplanting on abdominal arteries uterine segments that grow into vascularized cysts that become innervated with sensory and sympathetic fibers. ENDO rats exhibit vaginal hyperalgesia. We used behavioral, physiological, and immunohistochemical methods to test the hypothesis that cyst innervation contributes to the development of this hyperalgesia after transplant. Rudimentary sensory and sympathetic innervation appeared in the cysts at two weeks, sprouted further and more densely into the cyst wall by four weeks, and matured by six weeks post-transplant. Sensory fibers became abnormally functionally active between two and three weeks post-transplant, remaining active thereafter. Vaginal hyperalgesia became significant between four and five weeks post-transplant, and stabilized after six to eight weeks. Removing cysts before they acquired functional innervation prevented vaginal hyperalgesia from developing, whereas sham cyst removal did not. Thus, abnormally-active innervation of ectopic growths occurs before hyperalgesia develops, supporting the hypothesis. These findings suggest that painful endometriosis can be classified as a mixed inflammatory/neuropathic pain condition, which opens new avenues for pain relief. The findings also have implications beyond endometriosis by suggesting that functionality of any transplanted tissue can be influenced by the innervation it acquires.

  11. Sprouted innervation into uterine transplants contributes to the development of hyperalgesia in a rat model of endometriosis.

    Directory of Open Access Journals (Sweden)

    Stacy L McAllister

    Full Text Available Endometriosis is an enigmatic painful disorder whose pain symptoms remain difficult to alleviate in large part because the disorder is defined by extrauteral endometrial growths whose contribution to pain is poorly understood. A rat model (ENDO involves autotransplanting on abdominal arteries uterine segments that grow into vascularized cysts that become innervated with sensory and sympathetic fibers. ENDO rats exhibit vaginal hyperalgesia. We used behavioral, physiological, and immunohistochemical methods to test the hypothesis that cyst innervation contributes to the development of this hyperalgesia after transplant. Rudimentary sensory and sympathetic innervation appeared in the cysts at two weeks, sprouted further and more densely into the cyst wall by four weeks, and matured by six weeks post-transplant. Sensory fibers became abnormally functionally active between two and three weeks post-transplant, remaining active thereafter. Vaginal hyperalgesia became significant between four and five weeks post-transplant, and stabilized after six to eight weeks. Removing cysts before they acquired functional innervation prevented vaginal hyperalgesia from developing, whereas sham cyst removal did not. Thus, abnormally-active innervation of ectopic growths occurs before hyperalgesia develops, supporting the hypothesis. These findings suggest that painful endometriosis can be classified as a mixed inflammatory/neuropathic pain condition, which opens new avenues for pain relief. The findings also have implications beyond endometriosis by suggesting that functionality of any transplanted tissue can be influenced by the innervation it acquires.

  12. Age-related changes in the innervation of the prostate gland

    OpenAIRE

    2013-01-01

    The adult prostate gland grows and develops under hormonal control while its physiological functions are controlled by the autonomic nervous system. The prostate gland receives sympathetic input via the hypogastric nerve and parasympathetic input via the pelvic nerve. In addition, the hypogastric and pelvic nerves also provide sensory inputs to the gland. This review provides a summary of the innervation of the adult prostate gland and describes the changes which occur with age and disease. G...

  13. 肾交感神经去除术对心力衰竭犬心功能的影响%Influence of renal sympathetic denervation on cardiac function of dogs with heart failure

    Institute of Scientific and Technical Information of China (English)

    黄达民; 侯舒心; 罗晓菡; 张金春; 卢英民

    2016-01-01

    Objective:To study influence of renal sympathetic denervation (RDN)on cardiac function of dogs with heart failure (HF).Methods:A total of 40 dogs were randomly and equally divided into RDN group [received bilat- eral renal artery radiofrequency ablation (RFA)]and model group (only received femoral puncture).Pacemaker was implanted in every dog,and dog HF model was established using rapid right ventricular pacing.Cardiac and re-nal function indexes,BNP and sympathetic activity index levels were observed and compared between two groups be- fore RFA/sham operation,instant and four weeks after model establishment.Results:After operation four weeks, compared with model group,there were significant reductions in levels of epinephrine (E)[(362.69±42.54)ng/ml vs.(290.36±42.32)ng/ml],renin (R)[(305.46± 39.68)ng/ml vs.(230.04±32.80)ng/ml],aldosterone (AD)[(408.00±38.56)ng/ml vs.(246.00± 48.37)ng/ml],angiotensin Ⅱ (ATⅡ)[(280.00±48.08)pg/ml vs.(172.00±25.04)pg/ml]and norepinephrine (NE)[(425.65±50.54)ng/ml vs.(316.76±46.29)ng/ml]in RDN group (P<0.05 all);there were significant reductions in HR,respiratory rate (RR)and BNP level in RDN group,P<0.05 all;there were significant rise in SBP,LVEF,CO,CI,left ventricular pressure maximal rising rate (+dp/dtmax),left ventricular pressure maximal dropping rate (-dp/dtmax)and left ventricular end-systolic pressure (LVESP),and significant reductions in left ventricular end-systolic dimension (LVESd),left ventricular end-diastolic dimension (LVEDd)and left ventricular end-diastolic pressure (LVEDP)in RDN group,P<0.05 all.Conclusion:RDN can decrease renal sympathetic activity,improve heart function,inhibit myocardial remode- ling,its therapeutic effect is significant%目的:研究肾交感神经去除术(RDN)对心力衰竭(HF)犬心功能的影响.方法:选择实验犬40只,随机均分为RDN组(接受双肾动脉射频消融)及模型组(仅予股动脉穿刺).40只犬均安置心脏起搏器,用快速右室起搏的方法

  14. Sympathetic nerve-derived ATP regulates renal medullary blood flow via vasa recta pericytes

    Directory of Open Access Journals (Sweden)

    Scott S Wildman

    2013-10-01

    Full Text Available Pericyte cells are now known to be a novel locus of blood flow control, being able to regulate capillary diameter via their unique morphology and expression of contractile proteins. We have previously shown that exogenous ATP causes constriction of vasa recta via renal pericytes, acting at a variety of membrane bound P2 receptors on descending vasa recta, and therefore may be able to regulate medullary blood flow (MBF. Regulation of MBF is essential for appropriate urine concentration and providing essential oxygen and nutrients to this region of high, and variable, metabolic demand. Various sources of endogenous ATP have been proposed, including from epithelial, endothelial and red blood cells in response to stimuli such as mechanical stimulation, local acidosis, hypoxia, and exposure to various hormones. Extensive sympathetic innervation of the nephron has previously been shown, however the innervation reported has focused around the proximal and distal tubules, and ascending loop of Henle. We hypothesise that sympathetic nerves are an additional source of ATP acting at renal pericytes and therefore regulate MBF. Using a rat live kidney slice model in combination with video imaging and confocal microscopy techniques we firstly show sympathetic nerves in close proximity to vasa recta pericytes in both the outer and inner medulla. Secondly, we demonstrate pharmacological stimulation of sympathetic nerves in situ (by tyramine evokes pericyte-mediated vasoconstriction of vasa recta capillaries; inhibited by the application of the P2 receptor antagonist suramin. Lastly, tyramine-evoked vasoconstriction of vasa recta by pericytes is significantly less than ATP-evoked vasoconstriction. Sympathetic innervation may provide an additional level of functional regulation in the renal medulla that is highly localized. It now needs to be determined under which physiological/pathophysiological circumstances that sympathetic innervation of renal pericytes is

  15. Investigation of Sleep Bruxism Relating to Micro-arousals and Cardiac Sympathetic Activities%夜磨牙与微觉醒及心脏交感神经活动的关系

    Institute of Scientific and Technical Information of China (English)

    刘伟才; 王海波; 陈威; 李强

    2012-01-01

    Objective: To investigate whether rhythmic masticatory muscle activity (RMMA) is associated with sleep micro- arousals (MA), and analyze the association between RMMA of sleep bruxism patients (RMMA/SB) and autonomic cardiac activity. Methods: Thirty SB subjects and thirty control subjects for two consecutive nights were performed by polygraphic recordings. MA index and RMMA index were scored. The mean heart rate from a series of 10 cardiac cycles was calculated at 60, 40, 20 and 5 sec before RMMA onset respectively. To assess a transient beat-to-beat heart rate change in relation to the RMMA onset, heart rate from 5 cardiac cycles before and 5 cycles after the onset were also calculated. Results: Sleep bruxism (SB) subjects showed a higher incidence of rhythmic masticatory muscle activity (RMMA) than control subjects (6.10±1.05 vs. 1.81 ±0.39, P<0.0001). However, no difference was found in according to their micro-arousal index(7.72±1.21 vs.7.53±1.33, P=0.5641). RMMA/SB was associated with sleep micro-arousals. In both groups, transient heart rate acceleration was observed in relation to the onset of RMMA episodes. Conclusion: RMMA is associated with sleep micro-arousals. In SB subjects, a clear increase in sympathetic activity precedes SB onset.%目的:研究夜磨牙(sleep bruxism,SB)患者睡眠期咀嚼肌节律性运动(RMMA)发生的微觉醒机制.方法:对30名夜磨牙患者、30名正常人进行连续2夜的多导睡眠监测,研究RMMA事件与微觉醒(MA)的时间相关性;比较2组间RMMA指数及MA指数的差异;RMMA事件发生前60 s、前40 s、前20 s、前5s,共5个时间点的各连续10个心动周期的平均心率,以及RMMA事件发生前后各5个心动周期的心率变化.结果:夜磨牙症患者微觉醒指数(7.72±1.21)与正常对照相似(7.53±1.33,P=0.5641);但咀嚼肌节律性运动频率,即磨牙指数[(6.10±1.05)次/h]约3倍于正常对照组[(1.81±0.39)次/h,P<0.0001)].RMMA事件与MA存在高度时间相关

  16. α2A-adrenoceptors, but not nitric oxide, mediate the peripheral cardiac sympatho-inhibition of moxonidine.

    Science.gov (United States)

    Cobos-Puc, Luis E; Aguayo-Morales, Hilda; Silva-Belmares, Yesenia; González-Zavala, Maria A; Centurión, David

    2016-07-05

    Moxonidine centrally inhibits the sympathetic activity through the I1-imidazoline receptor and nitric oxide. In addition, inhibits the peripheral cardiac sympathetic outflow by α2-adrenoceptors/I1-imidazoline receptors, although the role of α2-adrenoceptor subtypes or nitric oxide in the cardiac sympatho-inhibition induced by moxonidine are unknown. Therefore, the cardiac sympatho-inhibition induced by moxonidine (10μg/kgmin) was evaluated before and after of the treatment with the following antagonists/inhibitor: (1) BRL 44408, (300μg/kg, α2A), imiloxan, (3000μg/kg, α2B), and JP-1302, (300μg/kg, α2C), in animals pretreated with AGN 192403 (3000μg/kg, I1 antagonist); (2) N(ω)-nitro-l-arginine methyl ester (l-NAME; 34, 100, and 340μg/kgmin); and (3) the combinations of the highest dose of l-NAME plus AGN 192403 or BRL 44408. Additionally, the expression of the neuronal (nNOS) and inducible (iNOS) nitric oxide synthase in the stellate ganglion was determined after treatment with moxonidine (i.p. 0.56mg/kg daily, during one week). The cardiac sympatho-inhibition of 10μg/kgmin moxonidine was: (1) unaffected by imiloxan and JP-1302, under pretreatment with AGN 192403, or l-NAME (34, 100 and 340μg/kgmin) given alone; (2) partially antagonized by the combination of 340 μg/kgmin l-NAME plus BRL 44408; and (3) abolished by BRL 44408 under treatment with AGN 192403. Furthermore, moxonidine did not modify the nNOS or iNOS protein expression in the stellate ganglion, the main source of postganglionic sympathetic neurons innervating the heart. In conclusion, our results suggest that the peripheral cardiac sympatho-inhibition induced by moxonidine is mediated by α2A-adrenoceptor subtype but not by nitric oxide.

  17. Cardiorenal axis and arrhythmias: Will renal sympathetic denervation provide additive value to the therapeutic arsenal?

    Science.gov (United States)

    van Brussel, Peter M; Lieve, Krystien V V; de Winter, Robbert J; Wilde, Arthur A M

    2015-05-01

    Disruption of sympathetic tone may result in the occurrence or maintenance of cardiac arrhythmias. Multiple arrhythmic therapies that intervene by influencing cardiac sympathetic tone are common in clinical practice. These vary from pharmaceutical (β-blockers, angiotensin-converting enzyme inhibitors, and calcium antagonists) to percutaneous/surgical (cardiac sympathetic denervation) interventions. In some patients, however, these therapies have insufficient prophylactic and therapeutic capabilities. A safe and effective additional therapy wherein sympathetic drive is further attenuated would be expedient. Recently, renal sympathetic denervation (RSD) has been subject of research for various sympathetic nervous system-related diseases. By its presumed afferent and efferent sympatholytic effects, RSD might indirectly attenuate sympathetic outflow via the brain to the heart but might also reduce systemic catecholamine excretion and might therefore reduce catecholamine-sensitive arrhythmias. RSD is subject of research for various sympathetically driven arrhythmias, both supraventricular and ventricular. In this review, we give an overview of the rationale behind RSD as potential therapy in mediating arrhythmias that are triggered by a disrupted sympathetic nervous system and discuss the presently available results from animal and human studies.

  18. Nitric oxide and the autonomic regulation of cardiac excitability. The G.L. Brown Prize Lecture.

    Science.gov (United States)

    Paterson, D

    2001-01-01

    Cardiac sympathetic imbalance and arrhythmia; Nitric oxide-cGMP pathway and the cholinergic modulation of cardiac excitability; Nitric oxide-cGMP pathway and the sympathetic modulation of cardiac excitability; Functional significance of nitric oxide in the autonomic regulation of cardiac excitability; Summary; References. Experimental Physiology (2001) 86.1, 1-12.

  19. Reduced sympathetic neurite outgrowth on uterine tissue sections from rats treated with estrogen.

    Science.gov (United States)

    Richeri, Analía; Bianchimano, Paola; Crutcher, Keith A; Brauer, M Mónica

    2010-05-01

    In order to evaluate the contribution of substrate-bound factors to the extent and patterning of the sympathetic innervation of rat uterus following estrogen treatment, superior cervical ganglion explants from neonatal and adult ovariectomized rats were cultured on tissue sections of fresh frozen uterus from adult ovariectomized rats treated with estrogen or a vehicle. The main findings were: (1) neurite growth was greatly influenced by histological features of the underlying section; (2) on myometrial sections, neurites followed the orientation of the main axis of the longitudinally sectioned muscle cells; (3) neurites showed limited growth on transversally sectioned smooth muscle; (4) neuritic patterning was unaffected by a reduction in migrating ganglionic non-neuronal cells; (5) neurite outgrowth, but not non-neural cell migration, was markedly reduced on myometrial sections from rats treated with estrogen. These results suggest that adult myometrium continues to provide signals allowing the organotypic patterning and growth of sympathetic axons, that estrogen treatment modifies myometrial substrate properties so that it is less supportive for sympathetic neurite growth, and that adult sympathetic neurons retain their ability to recognize substrate-bound cues present in the myometrium. On endometrial sections, neurites formed radially symmetric halos, which were reduced in size on estrogen-treated endometrial substrates. Thus, changes in the neuritogenic capacity of the uterus underlie plasticity in uterine sympathetic nerves, and alterations in substrate-bound factors contribute to the diminished receptivity of the estrogenized uterus to its sympathetic innervation.

  20. Differential effects of oestrogen on developing and mature uterine sympathetic nerves.

    Science.gov (United States)

    Chávez-Genaro, R; Crutcher, K; Viettro, L; Richeri, A; Coirolo, N; Burnstock, G; Cowen, T; Brauer, M M

    2002-04-01

    Oestrogen is a key factor in the remodelling of uterine sympathetic nerves during puberty and the oestrous cycle; these nerves are influenced by changes in their target uterine tissue. The magnitude of oestrogen-induced responses might however be influenced by the maturation stage of sympathetic nerve fibres, the age of the neurons and/or the developmental state of the uterus. We have therefore compared the sympathetic innervation of the uterus following chronic oestrogen treatment of infantile/prepubertal and young adult intact and ovariectomised rats. Treatment of infantile/prepubertal rats resulted in the complete loss of intrauterine noradrenaline (NA)-labelled sympathetic nerves and a marked reduction in the total NA content in the uterine horn. Chronic treatment of young adult rats had little effect. To examine whether the age of the neurons or the degree of development of the uterus determined responsiveness of nerves to oestrogen, we assessed the effects of oestrogen on the sympathetic reinnervation of intraocular transplants of young adult uterine myometrium into ovariectomised adult host rats. Early treatment (10 days post-transplantation) resulted in less sympathetic innervation than late treatment (30 days post-transplantation). Measurements of nerve growth factor (NGF) levels in the uterine horn of control rats before and after puberty and following infantile/prepubertal chronic oestrogen treatment and acute oestrogen treatment of young adult rats revealed a coordinated increase between the growth of the uterus and NGF protein levels. Thus, developing and recently regrown sympathetic nerves are more susceptible to oestrogen-induced changes in the uterus than mature nerves, differential susceptibility is not related to the age of the neurons or the developmental state of the uterus and changes in NGF protein do not account for the differential susceptibility of developing and mature uterine sympathetic nerve fibres to oestrogen. Growing sympathetic

  1. Eppur Si Muove: The dynamic nature of physiological control of renal blood flow by the renal sympathetic nerves.

    Science.gov (United States)

    Schiller, Alicia M; Pellegrino, Peter Ricci; Zucker, Irving H

    2016-08-03

    Tubuloglomerular feedback and the myogenic response are widely appreciated as important regulators of renal blood flow, but the role of the sympathetic nervous system in physiological renal blood flow control remains controversial. Where classic studies using static measures of renal blood flow failed, dynamic approaches have succeeded in demonstrating sympathetic control of renal blood flow under normal physiological conditions. This review focuses on transfer function analysis of renal pressure-flow, which leverages the physical relationship between blood pressure and flow to assess the underlying vascular control mechanisms. Studies using this approach indicate that the renal nerves are important in the rapid regulation of the renal vasculature. Animals with intact renal innervation show a sympathetic signature in the frequency range associated with sympathetic vasomotion that is eliminated by renal denervation. In conscious rabbits, this sympathetic signature exerts vasoconstrictive, baroreflex control of renal vascular conductance, matching well with the rhythmic, baroreflex-influenced control of renal sympathetic nerve activity and complementing findings from other studies employing dynamic approaches to study renal sympathetic vascular control. In this light, classic studies reporting that nerve stimulation and renal denervation do not affect static measures of renal blood flow provide evidence for the strength of renal autoregulation rather than evidence against physiological renal sympathetic control of renal blood flow. Thus, alongside tubuloglomerular feedback and the myogenic response, renal sympathetic outflow should be considered an important physiological regulator of renal blood flow. Clinically, renal sympathetic vasomotion may be important for solving the problems facing the field of therapeutic renal denervation.

  2. Sensory innervation of the dorsal longitudinal ligament and the meninges in the lumbar spine of the dog.

    Science.gov (United States)

    Waber-Wenger, Barbara; Forterre, Franck; Kuehni-Boghenbor, Kathrin; Danuser, Renzo; Stein, Jens Volker; Stoffel, Michael Hubert

    2014-10-01

    Although intervertebral disc herniation is a well-known disease in dogs, pain management for this condition has remained a challenge. The goal of the present study is to address the lack of information regarding the innervation of anatomical structures within the canine vertebral canal. Immunolabeling was performed with antibodies against protein gene product 9.5, Tuj-1 (neuron-specific class III β-tubulin), calcitonin gene-related peptide, and neuropeptide Y in combination with the lectin from Lycopersicon esculentum as a marker for blood vessels. Staining was indicative of both sensory and sympathetic fibers. Innervation density was the highest in lateral areas, intermediate in dorsal areas, and the lowest in ventral areas. In the dorsal longitudinal ligament (DLL), the highest innervation density was observed in the lateral regions. Innervation was lower at mid-vertebral levels than at intervertebral levels. The presence of sensory and sympathetic fibers in the canine dura and DLL suggests that pain may originate from both these structures. Due to these regional differences in sensory innervation patterns, trauma to intervertebral DLL and lateral dura is expected to be particularly painful. The results ought to provide a better basis for the assessment of medicinal and surgical procedures.

  3. Angiotensin II, sympathetic nerve activity and chronic heart failure.

    Science.gov (United States)

    Wang, Yutang; Seto, Sai-Wang; Golledge, Jonathan

    2014-03-01

    Sympathetic nerve activity has been reported to be increased in both humans and animals with chronic heart failure. One of the mechanisms believed to be responsible for this phenomenon is increased systemic and cerebral angiotensin II signaling. Plasma angiotensin II is increased in humans and animals with chronic heart failure. The increase in angiotensin II signaling enhances sympathetic nerve activity through actions on both central and peripheral sites during chronic heart failure. Angiotensin II signaling is enhanced in different brain sites such as the paraventricular nucleus, the rostral ventrolateral medulla and the area postrema. Blocking angiotensin II type 1 receptors decreases sympathetic nerve activity and cardiac sympathetic afferent reflex when therapy is administered to the paraventricular nucleus. Injection of an angiotensin receptor blocker into the area postrema activates the sympathoinhibitory baroreflex. In peripheral regions, angiotensin II elevates both norepinephrine release and synthesis and inhibits norepinephrine uptake at nerve endings, which may contribute to the increase in sympathetic nerve activity seen in chronic heart failure. Increased circulating angiotensin II during chronic heart failure may enhance the sympathoexcitatory chemoreflex and inhibit the sympathoinhibitory baroreflex. In addition, increased circulating angiotensin II can directly act on the central nervous system via the subfornical organ and the area postrema to increase sympathetic outflow. Inhibition of angiotensin II formation and its type 1 receptor has been shown to have beneficial effects in chronic heart failure patients.

  4. New treatment for old disease: management of resistant hypertension by percutaneous renal sympathetic denervation.

    Science.gov (United States)

    Kanai, Takashi; Krum, Henry

    2013-09-01

    Hypertension is a major contributor to cardiovascular events, such as stroke and myocardial infarction, with accelerated sympathetic nerve activity implicated in its pathogenesis. However, hypertension in many patients is not adequately controlled, despite the availability of numerous medication classes. Novel procedure-as well as device-based strategies, such as percutaneous renal sympathetic nerve denervation therapy-have been developed to improve blood pressure in these refractory patients. Renal sympathetic denervation delivers not only a decrease in blood pressure levels but also renal as well as systemic sympathetic nerve activity. The reduction in blood pressure appears to be sustained over 3 years after the procedure, which implies no counterregulatory mechanism or re-innervation of afferent renal sympathetic nerve so far. Renal sympathetic denervation is expected to be a promising treatment for patients with hypertension, congestive heart failure, chronic kidney disease, and metabolic syndrome implicated in the pathogenesis of potentiated sympathetic nerve activity. This review will focus on the current devices and procedures, their outcomes and prospects in the treatment of hypertension.

  5. Activation of histamine H3 receptors in human nasal mucosa inhibits sympathetic vasoconstriction.

    Science.gov (United States)

    Varty, LoriAnn M; Gustafson, Eric; Laverty, Maureen; Hey, John A

    2004-01-19

    The peripheral histamine H3 receptor is a presynaptic heterologous receptor located on postganglionic sympathetic nerve fibers innervating sympathetic effector systems such as blood vessels and the heart. An extensive body of evidence shows that activation of the histamine H3 receptor attenuates sympathetic tone by presynaptic inhibition of noradrenaline release. It is proposed that this sympathoinhibitory action, in vivo, leads to reduced vasoconstriction, thereby eliciting a vasodilatory effect. In humans, the peripheral histamine H3 receptor has also been shown to exert a sympathoinhibitory function on specific peripheral autonomic effector systems. For example, human saphenous vein and heart possess functional presynaptic histamine H3 receptors on the sympathetic nerve terminals that upon activation decrease the sympathetic tone to these respective organs. The present studies were conducted to define the role of histamine H3 receptors on neurogenic sympathetic vasoconstrictor responses in human nasal turbinate mucosa. Contractility studies were conducted to evaluate the effect of histamine H3 receptor activation on sympathetic vasoconstriction in surgically isolated human nasal turbinate mucosa. We found that the histamine H3 receptor agonist, (R)-alpha-methylhistamine (30 and 300 nM), inhibited electrical field stimulation-induced (neurogenic) sympathetic vasoconstriction in a concentration-dependent fashion. Pretreatment with the selective histamine H3 receptor antagonist, clobenpropit (100 nM), blocked the sympathoinhibitory effect of (R)-alpha-methylhistamine on the neurogenic sympathetic vasoconstriction. In addition, analysis of Taqman mRNA expression studies showed a specific, high level of distribution of the histamine H3 receptor localized in the human nasal mucosa. Taken together, these studies indicate that histamine H3 receptors modulate vascular contractile responses in human nasal mucosa most likely by inhibiting noradrenaline release from

  6. Auditory hair cell innervational patterns in lizards.

    Science.gov (United States)

    Miller, M R; Beck, J

    1988-05-22

    The pattern of afferent and efferent innervation of two to four unidirectional (UHC) and two to nine bidirectional (BHC) hair cells of five different types of lizard auditory papillae was determined by reconstruction of serial TEM sections. The species studies were Crotaphytus wislizeni (iguanid), Podarcis (Lacerta) sicula and P. muralis (lacertids), Ameiva ameiva (teiid), Coleonyx variegatus (gekkonid), and Mabuya multifasciata (scincid). The main object was to determine in which species and in which hair cell types the nerve fibers were innervating only one (exclusive innervation), or two or more hair cells (nonexclusive innervation); how many nerve fibers were supplying each hair cell; how many synapses were made by the innervating fibers; and the total number of synapses on each hair cell. In the species studies, efferent innervation was limited to the UHC, and except for the iguanid, C. wislizeni, it was nonexclusive, each fiber supplying two or more hair cells. Afferent innervation varied both with the species and the hair cell types. In Crotaphytus, both the UHC and the BHC were exclusively innervated. In Podarcis and Ameiva, the UHC were innervated exclusively by some fibers but nonexclusively by others (mixed pattern). In Coleonyx, the UHC were exclusively innervated but the BHC were nonexclusively innervated. In Mabuya, both the UHC and BHC were nonexclusively innervated. The number of afferent nerve fibers and the number of afferent synapses were always larger in the UHC than in the BHC. In Ameiva, Podarcis, and Mabuya, groups of bidirectionally oriented hair cells occur in regions of cytologically distinct UHC, and in Ameiva, unidirectionally oriented hair cells occur in cytologically distinct BHC regions.

  7. Do sympathetic nerves release noradrenaline in "quanta"?

    Science.gov (United States)

    Stjärne, L

    2000-07-01

    The discovery of excitatory junction potentials (EJPs) in guinea-pig vas deferens by Burnstock and Holman (1960) showed for the first time that a sympathetic transmitter, now known to be ATP, is secreted in "quanta". As it was assumed at the time that EJPS are triggered by noradrenaline, this discovery led to attempts to use the fractional overflow of noradrenaline from sympathetically innervated tissues to assess, indirectly, the number of noradrenaline molecules in the average "quantum". The basic finding was that each pulse released 1/50000 of the tissue content of noradrenaline, when reuptake was blocked and prejunctional alpha(2)-adrenoceptors were intact. This provided the constraints, two extreme alternatives: (i) each pulse releases 0.2-3% of the content of a vesicle from all varicosities, or (ii) each pulse releases the whole content of a vesicle from 0.2 to 3% of the varicosities. New techniques have made it possible to address questions about the release probability in individual sites, or the "quantal" size, more directly. Results by optical (comparison of the labelling of SV2 and synaptotagmin, proteins in the membrane of transmitter vesicles), electrophysiological (excitatory junction currents, EJCs, at single visualized varicosities) and amperometric (the noradrenaline oxidation current at a carbon fibre electrode) methods reveal that transmitter exocytosis in varicosities is intermittent. The EJC and noradrenaline oxidation current responses (in rat arteries) to a train of single pulses were observed to be similar in intermittency and amplitude fluctuation. This suggests that they are caused by exocytosis of single or very few "quanta" of ATP and noradrenaline, respectively, equal to the contents of single vesicles, from a small population of release sites. These findings support, but do not conclusively prove the validity of the "intermittent" model of noradrenaline release. The question if noradrenaline is always secreted in packets of preset size

  8. Characterization of the autonomic innervation of mammary gland in lactating rats studied by retrograde transynaptic virus labeling and immunohistochemistry.

    Science.gov (United States)

    Köves, Katalin; Györgyi, Z; Szabó, F K; Boldogkői, Zs

    2012-06-01

    The aim of experiments was to characterize the neurons of the autonomic chain that innervates the nipple and the mammary gland of lactating rats using retrograde transynaptic virus labeling and neurotransmitter and neuropeptide immunohistochemistry. Two days after injection of green fluorescence protein labeled virus in two nipples and underlying mammary glands, labeling was observed in the ipsilateral paravertebral sympathetic trunk and the lateral horn. Three days after inoculation the labeling appeared in the brain stem and the hypothalamic paraventricular nucleus. Above the spinal cord the labeling was bilateral. A subpopulation of virus labeled cells in the paraventricular nuclei synthesized oxytocin. Labeled neurons in the lateral horn showed cholinergic immunoreactivity. These cholinergic neurons innervated the paravertebral ganglia where the virus labeled neurons were partially noradrenergic. The noradrenergic fibers in the mammary gland innervate the smooth muscle wall of vessels, but not the mammary gland in rats. The neurons in the lateral horn receive afferents from the brain stem, and paraventricular nucleus and these afferents are noradrenergic and oxytocinergic. New findings in our work: Some oxytocinergic fibers may descend to the neurons of the lateral horn which innervate noradrenergic neurons in the paravertebral sympathetic trunk, and in turn these noradrenergic neurons reach the vessels of the mammary gland.

  9. Changes of the vasculature and innervation in the anterior segment of the RCS rat eye.

    Science.gov (United States)

    May, Christian Albrecht

    2011-12-01

    Investigating the anterior eye segment vasculature and innervation of dystrophic RCS rats, two major unique findings were observed: in the iris, young adult animals with retinal dystrophy showed an increase in substance P nerve fibres and a dilation of arterioles and capillaries. This finding continued during ageing. In the pars plana region, the surface covered by venules decreased continuously with age. In older animals, this decrease was parallelled by a local decrease of sympathetic TH-positive nerve fibres supplying these venules. For both conditions, no comparable data exists so far in the literature. They might point to a unique situation in the anterior eye segment of the dystrophic RCS rat.

  10. Dynamic resistance training decreases sympathetic tone in hypertensive ovariectomized rats

    Energy Technology Data Exchange (ETDEWEB)

    Shimojo, G.L.; Palma, R.K.; Brito, J.O.; Sanches, I.C. [Laboratório de Fisiologia Translacional, Programa de Ciências da Reabilitação, Universidade Nove de Julho, São Paulo, SP (Brazil); Irigoyen, M.C. [Instituto do Coração, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP (Brazil); De Angelis, K. [Laboratório de Fisiologia Translacional, Programa de Ciências da Reabilitação, Universidade Nove de Julho, São Paulo, SP (Brazil)

    2015-03-27

    The aim of this study was to investigate the effects of resistance exercise training on hemodynamics and cardiac autonomic control in ovariectomized spontaneously hypertensive rats. Female rats were divided into 4 groups: sedentary control (SC), sedentary hypertensive (SH), sedentary hypertensive ovariectomized (SHO), and resistance-trained hypertensive ovariectomized (RTHO). Resistance exercise training was performed on a vertical ladder (5 days/week, 8 weeks) at 40-60% maximal load. Direct arterial pressure was recorded. Vagal and sympathetic tones were measured by heart rate (HR) responses to methylatropine (3 mg/kg, iv) and propranolol (4 mg/kg, iv). Ovariectomy resulted in additional increases in blood pressure in hypertensive rats and was associated with decreased vagal tone. Resistance exercise trained rats had lower mean arterial pressure than untrained rats (RTHO: 159±2.2 vs SHO: 177±3.4 mmHg), as well as resting bradycardia (RTHO: 332±9.0 vs SHO: 356±5 bpm). Sympathetic tone was also lower in the trained group. Moreover, sympathetic tone was positively correlated with resting HR (r=0.7, P<0.05). The additional arterial pressure increase in hypertensive rats caused by ovarian hormone deprivation was attenuated by moderate-intensity dynamic resistance training. This benefit may be associated with resting bradycardia and reduced cardiac sympathetic tone after training, which suggests potential benefits of resistance exercise for the management of hypertension after ovarian hormone deprivation.

  11. Sympathetic nerves bridge the cross-transmission in hemifacial spasm.

    Science.gov (United States)

    Zheng, Xuesheng; Hong, Wenyao; Tang, Yinda; Wu, Zhenghai; Shang, Ming; Zhang, Wenchuan; Zhong, Jun; Li, Shiting

    2012-05-23

    The pathophysiologic basis of hemifacial spasm is abnormal cross-transmission between facial nerve fibers. The author hypothesized that the demyelinated facial nerve fibers were connected with the sympathetic nerve fibers on the offending artery wall, and thus the latter function as a bridge in the cross-transmission circuit. This hypothesis was tested using a rat model of hemifacial spasm. A facial muscle response was recorded while the offending artery wall was electrically stimulated. The nerve fibers on the offending artery wall were blocked with lidocaine, or the superior cervical ganglion, which innervates the offending artery, was resected, and meanwhile the abnormal muscle response was monitored and analyzed. A waveform was recorded from the facial muscle when the offending artery wall was stimulated, named as "Z-L response". The latency of Z-L response was different from that of abnormal muscle response. When the nerve fibers on the offending artery wall were blocked by lidocaine, the abnormal muscle response disappeared gradually and recovered in 2h. The abnormal muscle response disappeared permanently after the sympathetic ganglion was resected. Our findings indicate that cross-transmission between the facial nerve fibers is bridged by the nerve fibers on the offending artery wall, probably sympathetic nerve fibers.

  12. GENDER-SELECTIVE INTERACTION BETWEEN AGING AND CARDIOVASCULAR SYMPATHETIC ACTIVITY

    Directory of Open Access Journals (Sweden)

    Thorat D Kiran

    2010-06-01

    Full Text Available Physiologically aging refers to the impaired ability to maintain homeostasis during external as wellas internal stresses. The sympathetic nervous system becomes tonically, progressively and markedlyactivated with aging in humans. Study is done to measure the cardiovascular sympatheticdysfunctions in the males and females of the different age groups. Total 80, healthy subjects nothaving any major illness and any chronic addiction, were selected for the study. All the subjects wereevaluated by using “CANWIN cardiac autonomic neuropathy analyzer” using the tests like Pulse rateby Palpatory method, Blood Pressure response to sudden standing and Sustained Handgrip test. In all the elderly subjects the sympathetic system was over activated and this over activation of the sympathetic system became more severe as the age advanced. Aging is accompanied by a greater increase in sympathetic activity in women than in men, independent of menopausal status. The study concludes that there is more marked influence of age on sympathetic nervous system activation and impaired sensitivity of baroreceptors in women than men.

  13. Sympathetic neural control of indoleamine metabolism in the rat pineal gland

    Science.gov (United States)

    Lynch, H. J.; Hsuan, M.; Wurtman, R. J.

    1975-01-01

    The mechanisms responsible for the acceleration in rat pineal biosynthetic activity in response to prolonged exposure to darkness or to immobilization were investigated in animals whose pineals were surgically denervated. Some animals were adrenalectomized to remove one potential source of circulating catecholamines, and some were subjected to a partial chemical sympathectomy accomplished by a series of intravenous injections of 6-hydroxydopamine. Results suggest that N-acetyltransferase (NAT) activity can be enhanced either by release of norepinephrine from sympathetic terminals within the pineal or from sympathetic nerve terminals elsewhere. The stress of immobilization stimulates the pineal by increasing circulating catecholamines. Photic control of pineal function requires intact pineal sympathetic innervation, since the onset of darkness apparently does not cause a sufficient rise in circulating catecholamines to stimulate the pineal. The present studies suggest that nonspecific stress triggers increased biosynthesis and secretion of melatonin; it is possible that this hormone may participate in mechanisms of adaptation.

  14. [Psychosomatic aspects of cardiac arrhythmias].

    Science.gov (United States)

    Siepmann, Martin; Kirch, Wilhelm

    2010-07-01

    Emotional stress facilitates the occurrence of cardiac arrhythmias including sudden cardiac death. The prevalence of anxiety and depression is increased in cardiac patients as compared to the normal population. The risk of cardiovascular mortality is enhanced in patients suffering from depression. Comorbid anxiety disorders worsen the course of cardiac arrhythmias. Disturbance of neurocardiac regulation with predominance of the sympathetic tone is hypothesized to be causative for this. The emotional reaction to cardiac arrhythmias is differing to a large extent between individuals. Emotional stress may result from coping with treatment of cardiac arrhythmias. Emotional stress and cardiac arrhythmias may influence each other in the sense of a vicious circle. Somatoform cardiac arrhythmias are predominantly of psychogenic origin. Instrumental measures and frequent contacts between physicians and patients may facilitate disease chronification. The present review is dealing with the multifaceted relationships between cardiac arrhythmias and emotional stress. The underlying mechanisms and corresponding treatment modalities are discussed.

  15. A prediction model for 5-year cardiac mortality in patients with chronic heart failure using {sup 123}I-metaiodobenzylguanidine imaging

    Energy Technology Data Exchange (ETDEWEB)

    Nakajima, Kenichi; Matsuo, Shinro [Kanazawa University Hospital, Department of Nuclear Medicine, Kanazawa (Japan); Nakata, Tomoaki [Sapporo Medical University School of Medicine, Second Department of Internal Medicine (Cardiology), Sapporo (Japan); Hakodate-Goryoukaku Hospital, Department of Cardiology, Hakodate (Japan); Yamada, Takahisa [Osaka Prefectural General Medical Center, Department of Cardiology, Osaka (Japan); Yamashina, Shohei [Toho University Omori Medical Center, Department of Cardiovascular Medicine, Tokyo (Japan); Momose, Mitsuru [Tokyo Women' s Medical University, Department of Nuclear Medicine, Tokyo (Japan); Kasama, Shu [Cardiovascular Hospital of Central Japan, Department of Cardiology, Shibukawa (Japan); Matsui, Toshiki [Social Insurance Shiga General Hospital, Department of Cardiology, Otsu (Japan); Travin, Mark I. [Albert Einstein Medical College, Department of Cardiology and Nuclear Medicine, Montefiore Medical Center, Bronx, NY (United States); Jacobson, Arnold F. [GE Healthcare, Medical Diagnostics, Princeton, NJ (United States)

    2014-09-15

    Prediction of mortality risk is important in the management of chronic heart failure (CHF). The aim of this study was to create a prediction model for 5-year cardiac death including assessment of cardiac sympathetic innervation using data from a multicenter cohort study in Japan. The original pooled database consisted of cohort studies from six sites in Japan. A total of 933 CHF patients who underwent {sup 123}I-metaiodobenzylguanidine (MIBG) imaging and whose 5-year outcomes were known were selected from this database. The late MIBG heart-to-mediastinum ratio (HMR) was used for quantification of cardiac uptake. Cox proportional hazard and logistic regression analyses were used to select appropriate variables for predicting 5-year cardiac mortality. The formula for predicting 5-year mortality was created using a logistic regression model. During the 5-year follow-up, 205 patients (22 %) died of a cardiac event including heart failure death, sudden cardiac death and fatal acute myocardial infarction (64 %, 30 % and 6 %, respectively). Multivariate logistic analysis selected four parameters, including New York Heart Association (NYHA) functional class, age, gender and left ventricular ejection fraction, without HMR (model 1) and five parameters with the addition of HMR (model 2). The net reclassification improvement analysis for all subjects was 13.8 % (p < 0.0001) by including HMR and its inclusion was most effective in the downward reclassification of low-risk patients. Nomograms for predicting 5-year cardiac mortality were created from the five-parameter regression model. Cardiac MIBG imaging had a significant additive value for predicting cardiac mortality. The prediction formula and nomograms can be used for risk stratifying in patients with CHF. (orig.)

  16. Renal sympathetic denervation for treatment of patients with heart failure: summary of the available evidence.

    Science.gov (United States)

    Nammas, Wail; Koistinen, Juhani; Paana, Tuomas; Karjalainen, Pasi P

    2017-02-10

    Heart failure syndrome results from compensatory mechanisms that operate to restore - back to normal - the systemic perfusion pressure. Sympathetic overactivity plays a pivotal role in heart failure; norepinephrine contributes to maintenance of the systemic blood pressure and increasing preload. Cardiac norepinephrine spillover increases in patients with heart failure; norepinephrine exerts direct toxicity on cardiac myocytes resulting in a decrease of synthetic activity and/or viability. Importantly, cardiac norepinephrine spillover is a powerful predictor of mortality in patients with moderate to severe HF. This provided the rationale for trials that demonstrated survival benefit associated with the use of beta adrenergic blockers in heart failure with reduced ejection fraction. Nevertheless, the MOXCON trial demonstrated that rapid uptitration of moxonidine (inhibitor of central sympathetic outflow) in patients with heart failure was associated with excess mortality and morbidity, despite reduction of plasma norepinephrine. Interestingly, renal norepinephrine spillover was the only independent predictor of adverse outcome in patients with heart failure, in multivariable analysis. Recently, renal sympathetic denervation has emerged as a novel approach for control of blood pressure in patients with treatment-resistant hypertension. This article summarizes the available evidence for the effect of renal sympathetic denervation in the setting of heart failure. Key messages Experimental studies supported a beneficial effect of renal sympathetic denervation in heart failure with reduced ejection fraction. Clinical studies demonstrated improvement of symptoms, and left ventricular function. In heart failure and preserved ejection fraction, renal sympathetic denervation is associated with improvement of surrogate endpoints.

  17. Regression of polyneural innervation in the human psoas muscle

    NARCIS (Netherlands)

    Gramsbergen, A; IjkemaPaassen, J; Nikkels, PGJ; HaddersAlgra, M

    1997-01-01

    During the early stages of mammalian ontogeny muscle fibres are innervated by more than one axon. This polyneural innervation is replaced by mononeural innervation in the course of development. The regression of polyneural innervation in the psoas muscle in the human is the topic of the present stud

  18. Regional sympathetic denervation after myocardial infarction in humans detected noninvasively using I-123-metaiodobenzylguanidine

    Energy Technology Data Exchange (ETDEWEB)

    Stanton, M.S.; Tuli, M.M.; Radtke, N.L.; Heger, J.J.; Miles, W.M.; Mock, B.H.; Burt, R.W.; Wellman, H.N.; Zipes, D.P. (Indiana Univ. School of Medicine, IN (USA))

    1989-11-15

    Transmural myocardial infarction in dogs produces denervation of sympathetic nerves in viable myocardium apical to the infarct that may be arrhythmogenic. It is unknown whether sympathetic denervation occurs in humans. The purpose of this study was to use iodine-123-metaiodobenzylguanidine (MIBG), a radiolabeled guanethidine analog that is actively taken up by sympathetic nerve terminals, to image noninvasively the cardiac sympathetic nerves in patients with and without ventricular arrhythmias after myocardial infarction. Results showed that 10 of 12 patients with spontaneous ventricular tachyarrhythmias after myocardial infarction exhibited regions of thallium-201 uptake indicating viable perfused myocardium, with no MIBG uptake. Such a finding is consistent with sympathetic denervation. One patient had frequent episodes of nonsustained ventricular tachycardia induced at exercise testing that was eliminated by beta-adrenoceptor blockade. Eleven of the 12 patients had ventricular tachycardia induced at electrophysiologic study and metoprolol never prevented induction. Sympathetic denervation was also detected in two of seven postinfarction patients without ventricular arrhythmias. Normal control subjects had no regions lacking MIBG uptake. This study provides evidence that regional sympathetic denervation occurs in humans after myocardial infarction and can be detected noninvasively by comparing MIBG and thallium-201 images. Although the presence of sympathetic denervation may be related to the onset of spontaneous ventricular tachyarrhythmias in some patients, it does not appear to be related to sustained ventricular tachycardia induced at electrophysiologic study.

  19. Macrophages associated with the intrinsic and extrinsic autonomic innervation of the rat gastrointestinal tract.

    Science.gov (United States)

    Phillips, Robert J; Powley, Terry L

    2012-07-02

    Interactions between macrophages and the autonomic innervation of gastrointestinal (GI) tract smooth muscle have received little experimental attention. To better understand this relationship, immunohistochemistry was performed on GI whole mounts from rats at three ages. The phenotypes, morphologies, and distributions of gut macrophages are consistent with the cells performing extensive housekeeping functions in the smooth muscle layers. Specifically, a dense population of macrophages was located throughout the muscle wall where they were distributed among the muscle fibers and along the vasculature. Macrophages were also associated with ganglia and connectives of the myenteric plexus and with the sympathetic innervation. Additionally, these cells were in tight registration with the dendrites and axons of the myenteric neurons as well as the varicosities along the length of the sympathetic axons, suggestive of a contribution by the macrophages to the homeostasis of both synapses and contacts between the various elements of the enteric circuitry. Similarly, macrophages were involved in the presumed elimination of neuropathies as indicated by their association with dystrophic neurons and neurites which are located throughout the myenteric plexus and smooth muscle wall of aged rats. Importantly, the patterns of macrophage-neuron interactions in the gut paralleled the much more extensively characterized interactions of macrophages (i.e., microglia) and neurons in the CNS. The present observations in the PNS as well as extrapolations from homologous microglia in the CNS suggest that GI macrophages play significant roles in maintaining the nervous system of the gut in the face of wear and tear, disease, and aging.

  20. Recent advances in sympathetic ophthalmia.

    Science.gov (United States)

    Marak, G E

    1979-01-01

    Recent advances in understanding the pathogenesis of sympathetic ophthalmia are helping to remove the pigmented cloud which has obstructed the view of researchers on this disease for many years. Clinical features, diagnostic testing, histopathologic variations and principles of treatment are evaluated in the context of our increasing understanding of the pathogenesis of this disease. The relationship of sympathetic ophthalmia to Harada's disease and phacoantigenic uveitis are reviewed.

  1. Bursting into space: alterations of sympathetic control by space travel

    Science.gov (United States)

    Eckberg, D. L.

    2003-01-01

    AIM: Astronauts return to Earth with reduced red cell masses and hypovolaemia. Not surprisingly, when they stand, their heart rates may speed inordinately, their blood pressures may fall, and some may experience frank syncope. We studied autonomic function in six male astronauts (average +/- SEM age: 40 +/- 2 years) before, during, and after the 16-day Neurolab space shuttle mission. METHOD: We recorded electrocardiograms, finger photoplethysmographic arterial pressures, respiration, peroneal nerve muscle sympathetic activity, plasma noradrenaline and noradrenaline kinetics, and cardiac output, and we calculated stroke volume and total peripheral resistance. We perturbed autonomic function before and during spaceflight with graded Valsalva manoeuvres and lower body suction, and before and after the mission with passive upright tilt. RESULTS: In-flight baseline sympathetic nerve activity was increased above pre-flight levels (by 10-33%) in three subjects, in whom noradrenaline spillover and clearance also were increased. Valsalva straining provoked greater reductions of arterial pressure, and proportionally greater sympathetic responses in space than on Earth. Lower body suction elicited greater increases of sympathetic nerve activity, plasma noradrenaline, and noradrenaline spillover in space than on Earth. After the Neurolab mission, left ventricular stroke volume was lower and heart rate was higher during tilt, than before spaceflight. No astronaut experienced orthostatic hypotension or pre-syncope during 10 min of post-flight tilting. CONCLUSION: We conclude that baseline sympathetic outflow, however measured, is higher in space than on earth, and that augmented sympathetic nerve responses to Valsalva straining, lower body suction, and post-flight upright tilt represent normal adjustments to greater haemodynamic stresses associated with hypovolaemia.

  2. Anatomical and pathoanatomical studies on the spinal efferent systems innervating pelvic structures. 1. Organization of spinal nuclei in animals. 2. The nucleus X-pelvic motor system in man

    DEFF Research Database (Denmark)

    Schrøder, H D

    1985-01-01

    matter were found to contain catecholamines. In the dorsal horn the most intense fluorescence was seen in the superficial layers. The motoneuron neuropil exhibited the most prominent catecholamine-fluorescence of the ventral horn layers. In the sixth lumbar segment, which contains the motor nuclei......, suggesting the existence of axosomatic contacts, and by utilizing the fluorescent retrograde tracer True Blue in combination with the ALFA method tentative axosomatic noradrenergic synapses on identified neurons innervating small striated pelvic muscles could be visualized in the light microscope....... In the intermediate gray the intermediolateral nucleus in thoracic and upper lumbar segments was the most heavily innervated area, followed by the medial lumbar sympathetic group, which contains the majority of the sympathetic preganglionic neurons innervating the pelvic organs. The parasympathetic intermediolateral...

  3. Connections of Barrington's nucleus to the sympathetic nervous system in rats.

    Science.gov (United States)

    Cano, G; Card, J P; Rinaman, L; Sved, A F

    2000-03-15

    Barrington's nucleus (BN) has been considered a pontine center related exclusively to the control of pelvic parasympathetic activity. The present study demonstrates an anatomical linkage between BN and autonomic outflow to visceral targets innervated exclusively by the sympathetic division of the autonomic nervous system. Temporal analysis of infection after injection of pseudorabies virus (PRV), a retrograde transynaptic tracer, into two sympathetically innervated organs, the spleen and the kidney, revealed the presence of infected neurons in BN at early post-inoculation survival intervals. Immunohistochemical localization of PRV after spleen injections showed that a small subpopulation of BN neurons became labeled in a time frame coincident with the appearance of infected neurons in other brain regions known to project to sympathetic preganglionic neurons (SPNs) in the thoracic spinal cord; a larger number of infected neurons appeared in BN at intermediate intervals after PRV injections into the spleen or kidney. Coinjection of the retrograde tracer Fluoro-Gold i.p. and PRV into the spleen demonstrated that parasympathetic preganglionic neurons in the caudal medulla or lumbo-sacral spinal cord were not infected, indicating that infected BN neurons were not infected via a parasympathetic route. Thus, BN neurons become infected after PRV injections into the spleen or kidney either directly through BN projections to SPNs, or secondarily via BN projections to infected pre-preganglionic neurons. These results demonstrate an anatomical linkage, either direct or indirect, between BN and sympathetic activity. Because BN receives numerous inputs from diverse brain regions, the relation of BN with both branches of the autonomic nervous system suggests that this nucleus might play a role in the integration of supraspinal inputs relevant to the central coordination of sympathetic and parasympathetic activity.

  4. Involvement of hypothalamic AMP-activated protein kinase in leptin-induced sympathetic nerve activation.

    Directory of Open Access Journals (Sweden)

    Mamoru Tanida

    Full Text Available In mammals, leptin released from the white adipose tissue acts on the central nervous system to control feeding behavior, cardiovascular function, and energy metabolism. Central leptin activates sympathetic nerves that innervate the kidney, adipose tissue, and some abdominal organs in rats. AMP-activated protein kinase (AMPK is essential in the intracellular signaling pathway involving the activation of leptin receptors (ObRb. We investigated the potential of AMPKα2 in the sympathetic effects of leptin using in vivo siRNA injection to knockdown AMPKα2 in rats, to produce reduced hypothalamic AMPKα2 expression. Leptin effects on body weight, food intake, and blood FFA levels were eliminated in AMPKα2 siRNA-treated rats. Leptin-evoked enhancements of the sympathetic nerve outflows to the kidney, brown and white adipose tissues were attenuated in AMPKα2 siRNA-treated rats. To check whether AMPKα2 was specific to sympathetic changes induced by leptin, we examined the effects of injecting MT-II, a melanocortin-3 and -4 receptor agonist, on the sympathetic nerve outflows to the kidney and adipose tissue. MT-II-induced sympatho-excitation in the kidney was unchanged in AMPKα2 siRNA-treated rats. However, responses of neural activities involving adipose tissue to MT-II were attenuated in AMPKα2 siRNA-treated rats. These results suggest that hypothalamic AMPKα2 is involved not only in appetite and body weight regulation but also in the regulation of sympathetic nerve discharges to the kidney and adipose tissue. Thus, AMPK might function not only as an energy sensor, but as a key molecule in the cardiovascular, thermogenic, and lipolytic effects of leptin through the sympathetic nervous system.

  5. Involvement of hypothalamic AMP-activated protein kinase in leptin-induced sympathetic nerve activation.

    Science.gov (United States)

    Tanida, Mamoru; Yamamoto, Naoki; Shibamoto, Toshishige; Rahmouni, Kamal

    2013-01-01

    In mammals, leptin released from the white adipose tissue acts on the central nervous system to control feeding behavior, cardiovascular function, and energy metabolism. Central leptin activates sympathetic nerves that innervate the kidney, adipose tissue, and some abdominal organs in rats. AMP-activated protein kinase (AMPK) is essential in the intracellular signaling pathway involving the activation of leptin receptors (ObRb). We investigated the potential of AMPKα2 in the sympathetic effects of leptin using in vivo siRNA injection to knockdown AMPKα2 in rats, to produce reduced hypothalamic AMPKα2 expression. Leptin effects on body weight, food intake, and blood FFA levels were eliminated in AMPKα2 siRNA-treated rats. Leptin-evoked enhancements of the sympathetic nerve outflows to the kidney, brown and white adipose tissues were attenuated in AMPKα2 siRNA-treated rats. To check whether AMPKα2 was specific to sympathetic changes induced by leptin, we examined the effects of injecting MT-II, a melanocortin-3 and -4 receptor agonist, on the sympathetic nerve outflows to the kidney and adipose tissue. MT-II-induced sympatho-excitation in the kidney was unchanged in AMPKα2 siRNA-treated rats. However, responses of neural activities involving adipose tissue to MT-II were attenuated in AMPKα2 siRNA-treated rats. These results suggest that hypothalamic AMPKα2 is involved not only in appetite and body weight regulation but also in the regulation of sympathetic nerve discharges to the kidney and adipose tissue. Thus, AMPK might function not only as an energy sensor, but as a key molecule in the cardiovascular, thermogenic, and lipolytic effects of leptin through the sympathetic nervous system.

  6. Intracerebroventricular administration of neuropeptide Y induces hepatic insulin resistance via sympathetic innervation

    NARCIS (Netherlands)

    Hoek, A.M. van den; Heijningen, C. van; Schröder - Elst, J.P. van der; Ouwens, D.M.; Havekes, L.M.; Romijn, J.A.; Kalsbeek, A.; Pijl, H.

    2008-01-01

    OBJECTIVE-We recently showed that intracerebroventricular infusion of neuropeptide Y (NPY) hampers inhibition of endogenous glucose production (EGP) by insulin in mice. The down stream mechanisms responsible for these effects of NPY remain to be elucidated. Therefore, the aim of this study was to es

  7. (Non-invasive evaluation of the cardiac autonomic nervous system by PET)

    Energy Technology Data Exchange (ETDEWEB)

    1992-01-01

    The proposed research addresses the development, validation and application of cardiac PET imaging techniques to characterize the autonomic nervous system of the heart. PET technology has significantly matured over the last two decades. Instrument design, image processing and production of radiochemical compounds have formed an integrative approach to provide a powerful and novel imaging modality for the quantitative in vivo evaluation of the autonomic nervous system of the heart. Animal studies using novel tracers for the sympathetic and parasympathetic nerve terminals will be employed to characterize the functional integrity of nerve terminals. This work will be complemented by the development of agents which bind to postsynaptic receptor sites. The combined evaluation of presynaptic and postsynaptic neuronal function will allow a unique characterization of neuronal function. Initial development in animal studies will be followed by feasibility studies in humans. These studies are designed to test sophisticated imaging protocols in the human heart and validate the scintigraphic findings with independent markers of autonomic innervation. Subsequent clinical application in various cardiac diseases is expected to provide new insights into the neuropathophysiology of the heart.

  8. Contribution of renal innervation to hypertension in rat autosomal dominant polycystic kidney disease.

    Science.gov (United States)

    Gattone, Vincent H; Siqueira, Tibério M; Powell, Charles R; Trambaugh, Chad M; Lingeman, James E; Shalhav, Arieh L

    2008-08-01

    The kidney has both afferent (sensory) and efferent (sympathetic) nerves that can influence renal function. Renal innervation has been shown to play a role in the pathogenesis of many forms of hypertension. Hypertension and flank pain are common clinical manifestations of autosomal dominant (AD) polycystic kidney disease (PKD). We hypothesize that renal innervation contributes to the hypertension and progression of cystic change in rodent PKD. In the present study, the contribution of renal innervation to hypertension and progression of renal histopathology and dysfunction was assessed in male Han:SPRD-Cy/+ rats with ADPKD. At 4 weeks of age, male offspring from crosses of heterozygotes (Cy/+) were randomized into either 1) bilateral surgical renal denervation, 2) surgical sham denervation control, or 3) nonoperated control groups. A midline laparotomy was performed to allow the renal denervation (i.e., physical stripping of the nerves and painting the artery with phenol/alcohol). Blood pressure (tail cuff method), renal function (BUN) and histology were assessed at 8 weeks of age. Bilateral renal denervation reduced the cystic kidney size, cyst volume density, systolic blood pressure, and improved renal function (BUN) as compared with nonoperated controls. Operated control cystic rats had kidney weights, cyst volume densities, systolic blood pressures, and plasma BUN levels that were intermediate between those in the denervated animals and the nonoperated controls. The denervated group had a reduced systolic blood pressure compared with the operated control animals, indicating that the renal innervations was a major contributor to the hypertension in this model of ADPKD. Renal denervation was efficacious in reducing some pathology, including hypertension, renal enlargement, and cystic pathology. However, sham operation also affected the cystic disease but to a lesser extent. We hypothesize that the amelioration of hypertension in Cy/+ rats was due to the effects

  9. The human sympathetic nervous system: its relevance in hypertension and heart failure.

    Science.gov (United States)

    Parati, Gianfranco; Esler, Murray

    2012-05-01

    Evidence assembled in this review indicates that sympathetic nervous system dysfunction is crucial in the development of heart failure and essential hypertension. This takes the form of persistent and adverse activation of sympathetic outflows to the heart and kidneys in both conditions. An important goal for clinical scientists is translation of the knowledge of pathophysiology, such as this, into better treatment for patients. The achievement of this 'mechanisms to management' transition is at different stages of development with regard to the two disorders. Clinical translation is mature in cardiac failure, knowledge of cardiac neural pathophysiology having led to the introduction of beta-adrenergic blockers, an effective therapy. With essential hypertension perhaps we are on the cusp of effective translation, with recent successful testing of selective catheter-based renal sympathetic nerve ablation in patients with resistant hypertension, an intervention firmly based on the demonstration of activation of the renal sympathetic outflow. Additional evidence in this regard is provided by the results of pilot studies exploring the possibility to reduce blood pressure in resistant hypertensives through electrical stimulation of the area of carotid baroreceptors. Despite the general importance of the sympathetic nervous system in blood pressure regulation, and the specific demonstration that the blood pressure elevation in essential hypertension is commonly initiated and sustained by sympathetic nervous activation, drugs antagonizing this system are currently underutilized in the care of patients with hypertension. Use of beta-adrenergic blocking drugs is waning, given the propensity of this drug class to have adverse metabolic effects, including predisposition to diabetes development. The blood pressure lowering achieved with carotid baroreceptor stimulation and with the renal denervation device affirms the importance of the sympathetic nervous system in

  10. Sympathetic nervous system promotes hepatocarcinogenesis by modulating inflammation through activation of alpha1-adrenergic receptors of Kupffer cells.

    Science.gov (United States)

    Huan, Hong-Bo; Wen, Xu-Dong; Chen, Xue-Jiao; Wu, Lin; Wu, Li-Li; Zhang, Liang; Yang, Da-Peng; Zhang, Xia; Bie, Ping; Qian, Cheng; Xia, Feng

    2017-01-01

    The sympathetic nervous system (SNS) is known to play a significant role in tumor initiation and metastasis. Hepatocellular carcinoma (HCC) frequently occurs in cirrhotic livers after chronic inflammation, and the SNS is hyperactive in advanced liver cirrhosis. However, it remains unclear whether the SNS promotes hepatocarcinogenesis by modulating chronic liver inflammation. In this study, a retrospective pathological analysis and quantification of sympathetic nerve fiber densities (tyrosine hydroxylase, TH(+)) in HCC patients, and diethylnitrosamine (DEN)-induced hepatocarcinogenesis in rats were performed. Our data showed that high density of sympathetic nerve fibers and α1-adrenergic receptors (ARs) of Kupffer cells (KCs) were associated with a poor prognosis of HCC. Sympathetic denervation or blocking of α1-ARs decreased DEN-induced HCC incidence and tumor development. In addition, synergistic effects of interleukin-6 (IL-6) and transforming growth factor-beta (TGF-β) in hepatocarcinogenesis were observed. The suppression of the SNS reduced IL-6 and TGF-β expression, which suppressed hepatocarcinogenesis, and KCs play a key role in this process. After the ablation of KCs, IL-6 and TGF-β expression and the development of HCC were inhibited. This study demonstrates that sympathetic innervation is crucial for hepatocarcinogenesis and that the SNS promotes hepatocarcinogenesis by activating α1-ARs of KCs to boost the activation of KCs and to maintain the inflammatory microenvironment. These results indicate that sympathetic denervation or α1-ARs blockage may represent novel treatment approaches for HCC.

  11. Renal sympathetic nerve activity during asphyxia in fetal sheep.

    Science.gov (United States)

    Booth, Lindsea C; Malpas, Simon C; Barrett, Carolyn J; Guild, Sarah-Jane; Gunn, Alistair J; Bennet, Laura

    2012-07-01

    The sympathetic nervous system (SNS) is an important mediator of fetal adaptation to life-threatening in utero challenges, such as asphyxia. Although the SNS is active well before term, SNS responses mature significantly over the last third of gestation, and its functional contribution to adaptation to asphyxia over this critical period of life remains unclear. Therefore, we examined the hypotheses that increased renal sympathetic nerve activity (RSNA) is the primary mediator of decreased renal vascular conductance (RVC) during complete umbilical cord occlusion in preterm fetal sheep (101 ± 1 days; term 147 days) and that near-term fetuses (119 ± 0 days) would have a more rapid initial vasomotor response, with a greater increase in RSNA. Causality of the relationship of RSNA and RVC was investigated using surgical (preterm) and chemical (near-term) denervation. All fetal sheep showed a significant increase in RSNA with occlusion, which was more sustained but not significantly greater near-term. The initial fall in RVC was more rapid in near-term than preterm fetal sheep and preceded the large increase in RSNA. These data suggest that although RSNA can increase as early as 0.7 gestation, it is not the primary determinant of RVC. This finding was supported by denervation studies. Interestingly, chemical denervation in near-term fetal sheep was associated with an initial fall in blood pressure, suggesting that by 0.8 gestation sympathetic innervation of nonrenal vascular beds is critical to maintain arterial blood pressure during the rapid initial adaptation to asphyxia.

  12. Cervical sympathetic chain schwannoma masquerading as a carotid body tumour with a postoperative complication of first-bite syndrome.

    LENUS (Irish Health Repository)

    Casserly, Paula

    2012-01-31

    Carotid body tumours (CBT) are the most common tumours at the carotid bifurcation. Widening of the bifurcation is usually demonstrated on conventional angiography. This sign may also be produced by a schwannoma of the cervical sympathetic plexus. A 45-year-old patient presented with a neck mass. Investigations included contrast-enhanced CT, MRI and magnetic resonance arteriography with contrast enhancement. Radiologically, the mass was considered to be a CBT due to vascular enhancement and splaying of the internal and external carotid arteries. Intraoperatively, it was determined to be a cervical sympathetic chain schwannoma (CSCS). The patient had a postoperative complication of first-bite syndrome (FBS).Although rare, CSCS should be considered in the differential diagnosis for tumours at the carotid bifurcation. Damage to the sympathetic innervation to the parotid gland can result in severe postoperative pain characterised by FBS and should be considered in all patients undergoing surgery involving the parapharyngeal space.

  13. Preganglionic innervation of the pancreas islet cells in the rat

    NARCIS (Netherlands)

    LUITEN, PGM; TERHORST, GJ; KOOPMANS, SJ; RIETBERG, M; STEFFENS, AB

    1984-01-01

    The position and number of preganglionic somata innervating the insulin-secreting β-cells of the endocrine pancreas were investigated in Wistar rats. This question was approached by comparing the innervation of the pancreas of normal rats with the innervation of the pancreas in alloxan-induced diabe

  14. Oestrogen regulates sympathetic neurite outgrowth by modulating brain derived neurotrophic factor synthesis and release by the rodent uterus.

    Science.gov (United States)

    Krizsan-Agbas, D; Pedchenko, T; Hasan, W; Smith, P G

    2003-11-01

    Sympathetic innervation of the adult rodent uterus undergoes cyclic remodelling. Terminal sympathetic axons degenerate when oestrogen levels rise and regenerate when oestrogen levels decline. This study examined the role of neurotrophins in oestrogen-mediated uterine sympathetic nerve remodelling. Oestrogen injection of ovariectomized female rats did not affect uterine NT-3 levels 24 h postinjection, and increased endometrial NGF protein, indicating that reduced NGF or NT-3 is not responsible for the oestrogen-induced denervation. Oestrogen also raised BDNF protein and mRNA in myometrium and endometrium. To assess whether increased BDNF affects uterine receptivity to sympathetic outgrowth, sympathetic ganglion explants were co-cultured with myometrium. Myometrium from ovariectomized rats induced neuritogenesis in oestrogen-free conditions, and this was abolished when BDNF was added to the medium. Neuritogenesis induced by ovariectomized myometrium was suppressed by oestrogen, and restored by a BDNF function-blocking antibody. To determine if target BDNF synthesis is required for oestrogen to suppress sympathetic neurite outgrowth, uteri from wild-type mice and mice homozygous or heterozygous for recombinant mutations of the BDNF gene were cultured with rat sympathetic ganglia. Neuritogenesis induced by wild-type uteri was diminished by oestrogen. Neurite formation in the presence of homozygous BDNF mutant uteri was not affected by oestrogen, but was lower than that of wild-type mice. Uteri from mice heterozygous for the BDNF mutation, who have reduced BDNF synthesis, showed normal neuritogenic properties, but were not affected by oestrogen. These findings suggest that oestrogen alters neuritogenic properties of the rodent uterus by regulating BDNF synthesis, which inhibits sympathetic neurite outgrowth.

  15. Molecular Aspects of Exercise-induced Cardiac Remodeling.

    Science.gov (United States)

    Bernardo, Bianca C; McMullen, Julie R

    2016-11-01

    Exercise-induced cardiac remodeling is typically an adaptive response associated with cardiac myocyte hypertrophy and renewal, increased cardiac myocyte contractility, sarcomeric remodeling, cell survival, metabolic and mitochondrial adaptations, electrical remodeling, and angiogenesis. Initiating stimuli/triggers of cardiac remodeling include increased hemodynamic load, increased sympathetic activity, and the release of hormones and growth factors. Prolonged and strenuous exercise may lead to maladaptive exercise-induced cardiac remodeling including cardiac dysfunction and arrhythmia. In addition, this article describes novel therapeutic approaches for the treatment of heart failure that target mechanisms responsible for adaptive exercise-induced cardiac remodeling, which are being developed and tested in preclinical models.

  16. Innervation of the rat uterus at estrus: a study in full-thickness, immunoperoxidase-stained whole-mount preparations.

    Science.gov (United States)

    Gnanamanickam, Greta J E; Llewellyn-Smith, Ida J

    2011-03-01

    The innervation of the nonpregnant rat uterus has been studied in histological sections, which contain only small samples of nerves and are unlikely to afford a complete picture of uterine innervation. Here we used whole-mount preparations of entire full-thickness uterine horns from nonpregnant rats in estrus to visualize autonomic or sensory nerves with peroxidase immunohistochemistry. Immunoreactivity was studied for tyrosine hydroxylase (TH)-labeled sympathetic nerves; vesicular acetylcholine transporter (VAChT), parasympathetic nerves; and substance P (SP) and calcitonin gene-related peptide (CGRP), sensory nerves. Neuropeptide Y (NPY) and nitric oxide synthase (NOS) identified more than one of these functionally distinct nerve types. Axons of all neurochemical classes entered the uterus at the mesometrium and innervated the uterine smooth muscle. The linea uteri, a dense band of longitudinal muscle opposite the mesometrium, contained more TH-, NPY-, CGRP-, and VAChT-immunoreactive axons than the remaining smooth muscle. Axons immunoreactive for NPY, SP, NOS, and VAChT formed a plexus near the circular muscle-endometrium interface. Rare TH- and NPY-immunoreactive axons and occasional CGRP-immunoreactive axons occurred close to uterine glands. Blood vessels had dense perivascular plexuses of TH- and NPY-containing axons and less dense NOS-, SP-, CGRP-, and VAChT-positive plexuses. The circular muscle plexus and glands were absent opposite the mesometrium. Uterine arterioles formed an interconnected network throughout the uterus. This article provides the first comprehensive description of the autonomic and sensory innervation of the nonpregnant rat uterus and will be a foundation for future studies on changes in uterine innervation caused by normal physiological or pathophysiological challenges.

  17. Development of Postural Muscles and Their Innervation

    Directory of Open Access Journals (Sweden)

    J. IJkema-Paassen

    2005-01-01

    Full Text Available Control of posture is a prerequisite for efficient motor performance. Posture depends on muscles capable of enduring contractions, whereas movements often require quick, forceful muscle actions. To serve these different goals, muscles contain fibers that meet these different tasks. Muscles with strong postural functions mainly consist of slow muscle fibers with a great resistance against fatigue. Flexor muscles in the leg and arm muscles are mainly composed of fast muscle fibers producing relatively large forces that are rapidly fatigable. Development of the neuromuscular system continues after birth. We discuss in the human baby and in animal experiments changes in muscle fiber properties, regression from polyneural into mononeural innervation, and developmental changes in the motoneurons of postural muscles during that period. The regression of poly-neural innervation in postural muscles and the development of dendrite bundles of their motoneurons seem to be linked to the transition from the immature into the adult-like patterns of moving and postural control.

  18. Origins of serotonin innervation of forebrain structures

    Science.gov (United States)

    Kellar, K. J.; Brown, P. A.; Madrid, J.; Bernstein, M.; Vernikos-Danellis, J.; Mehler, W. R.

    1977-01-01

    The tryptophan hydroxylase activity and high-affinity uptake of (3H) serotonin ((3H)5-HT) were measured in five discrete brain regions of rats following lesions of the dorsal or median raphe nuclei. Dorsal raphe lesions reduced enzyme and uptake activity in the striatum only. Median raphe lesions reduced activities in the hippocampus, septal area, frontal cortex, and, to a lesser extent, in the hypothalamus. These data are consistent with the suggestion that the dorsal and median raphe nuclei are the origins of two separate ascending serotonergic systems - one innervating striatal structures and the other mesolimbic structures, predominantly. In addition, the data suggest that measurements of high-affinity uptake of (3H)5-HT may be a more reliable index of innervation than either 5-HT content or tryptophan hydroxylase activity.

  19. Endometriosis-induced vaginal hyperalgesia in the rat: role of the ectopic growths and their innervation.

    Science.gov (United States)

    McAllister, Stacy L; McGinty, Kristina A; Resuehr, David; Berkley, Karen J

    2009-12-15

    Endometriosis is a painful disorder defined by extrauteral endometrial growths whose contribution to pain symptoms is poorly understood. Endometriosis is created in rats by autotransplanting on abdominal arteries pieces of either uterus (ENDO), which form cysts, or fat (shamENDO), which do not form cysts. ENDO, but not shamENDO induces vaginal hyperalgesia. We tested the hypothesis that the cysts are necessary to maintain vaginal hyperalgesia by assessing the effect of surgically removing them. Complete-cyst-removal eliminated ENDO-induced vaginal hyperalgesia up to 4 months post-operatively. Sham-cyst-removal in ENDO rats, in which cysts were not removed, or partial cyst-removal increased the ENDO-induced hyperalgesia. The decreases and increases both took 3-6 weeks to develop. Changes in ENDO-induced hyperalgesia did not occur in a control group of ENDO rats who had no surgery after ENDO. In a double-surgery control group, neither shamENDO surgery nor a subsequent sham surgery that mimicked "removal" of non-existent cysts influenced vaginal nociception. In a no-surgery control group, vaginal nociception remained stable for >6 months. The increases in ENDO-induced hyperalgesia produced by the sham-cyst-removal surgery were smaller in proestrus than in other estrous stages. During the other stages (but not during proestrus), sympathetic innervation of the cysts increased. These results suggest that maintenance of ENDO-induced vaginal hyperalgesia requires continued presence of at least some ectopic endometrial tissue, and that surgical treatment that fails to remove ectopic endometrial tissue can exacerbate the hyperalgesia, possibly due in part to an increase in the cysts' sympathetic innervation.

  20. [Non-invasive evaluation of the cardiac autonomic nervous system by PET]. Progress report, September 1991--September 1992

    Energy Technology Data Exchange (ETDEWEB)

    1992-09-01

    The proposed research addresses the development, validation and application of cardiac PET imaging techniques to characterize the autonomic nervous system of the heart. PET technology has significantly matured over the last two decades. Instrument design, image processing and production of radiochemical compounds have formed an integrative approach to provide a powerful and novel imaging modality for the quantitative in vivo evaluation of the autonomic nervous system of the heart. Animal studies using novel tracers for the sympathetic and parasympathetic nerve terminals will be employed to characterize the functional integrity of nerve terminals. This work will be complemented by the development of agents which bind to postsynaptic receptor sites. The combined evaluation of presynaptic and postsynaptic neuronal function will allow a unique characterization of neuronal function. Initial development in animal studies will be followed by feasibility studies in humans. These studies are designed to test sophisticated imaging protocols in the human heart and validate the scintigraphic findings with independent markers of autonomic innervation. Subsequent clinical application in various cardiac diseases is expected to provide new insights into the neuropathophysiology of the heart.

  1. An Autonomic Link Between Inhaled Diesel Exhaust and Impaired Cardiac Performance: Insight From Treadmill and Doubutamine Challenges in Heart Failure-Prone Rats

    Science.gov (United States)

    Background: Short-term exposure to vehicular emissions is associated with adverse cardiac events. Diesel exhaust (DE) is an ubiquitous air pollutant believed to provoke cardiac events partly through imbalance of the sympathetic and parasympathetic branches of the autonomic nervo...

  2. Simultaneous Tc-99m/I-123 Dual Radionuclide Myocardial Perfusion/Innervation Imaging Using Siemens IQ-SPECT with SMARTZOOM Collimator

    OpenAIRE

    Du, Yong; Bhattacharya, Manojeet; Frey, Eric C.

    2014-01-01

    Simultaneous dual-radionuclide myocardial perfusion/innervation SPECT imaging can provide important information about mismatch between scar tissue and denervated regions. The Siemens IQ-SPECT system developed for cardiac imaging uses a multifocal SMARTZOOM collimator to achieve a four-fold sensitivity for the cardiac region compared to a typical parallel-hole low-energy high-resolution collimator but without the data truncation that can result with conventional converging-beam collimators. Th...

  3. The role of NGF in pregnancy-induced degeneration and regeneration of sympathetic nerves in the guinea pig uterus.

    Science.gov (United States)

    Brauer, M M; Shockley, K P; Chávez, R; Richeri, A; Cowen, T; Crutcher, K A

    2000-02-14

    In the guinea pig, pregnancy is associated with a generalised depletion of noradrenaline in uterine sympathetic nerves and, in the areas of the uterus surrounding the foetus, by a complete degeneration of sympathetic nerve fibres. These pregnancy-induced changes have been interpreted as a selective effect of placental hormones on the system of short sympathetic fibres arising from the paracervical ganglia. An alternative explanation is that pregnancy affects the neurotrophic capacity of the uterus. We measured NGF-protein levels in the guinea pig uterine horn, tubal end and cervix at early pregnancy, late pregnancy and early postpartum, using a two-site enzyme-linked immunosorbent assay. For comparative purposes the distribution and relative density of noradrenaline-containing sympathetic nerve fibres were assessed histochemically, and tissue levels of noradrenaline were measured biochemically, using high-performance liquid chromatography with electrochemical detection. In all the uterine regions analysed, NGF-protein levels showed a decline at term pregnancy, but in no case was this change statistically significant. After delivery, NGF-protein levels showed a marked increase in the cervix as well as in both the fertile and empty horns. These results suggest that alterations in NGF-protein do not account for the impairment of uterine sympathetic innervation during pregnancy, but may contribute to their recovery after delivery.

  4. Sympathetically-induced changes in microvascular cerebral blood flow and in the morphology of its low-frequency waves.

    Science.gov (United States)

    Deriu, F; Roatta, S; Grassi, C; Urciuoli, R; Micieli, G; Passatore, M

    1996-06-10

    The effect of bilateral cervical sympathetic nerve stimulation on microvascular cerebral blood flow, recorded at various depths in the parietal lobe and in ponto-mesencephalic areas, was investigated by laser-Doppler flowmetry in normotensive rabbits. These areas were chosen as representative of the vascular beds supplied by the carotid and vertebro-basilar systems, which exhibit different degrees of sympathetic innervation, the former being richer than the latter. Sympathetic stimulation at 30 imp/s affects cerebral blood flow in 77% of the parietal lobe and in 43% of the ponto-mesencephalic tested areas. In both cases the predominant effect was a reduction in blood flow (14.7 +/- 5.1% and 4.1 +/- 2.4%, respectively). The extent of the reduction in both areas was less if the stimulation frequency was decreased. Sometimes mean cerebral blood flow showed a small and transient increase, mainly in response to low-frequency stimulation. The morphology was analysed of low-frequency spontaneous oscillations in cerebral blood flow, attributed to vasomotion. Present in 41% of the tested areas (frequency 4-12 cycles/min, peak-to-peak amplitude 10-40% of mean value), these waves decreased in amplitude and increased in frequency during sympathetic stimulation, irrespective of changes in mean flow. The possibility has been proposed that the sympathetic action on low-frequency spontaneous oscillations may contribute to the protective influence that this system is known to exert on the blood-brain barrier in hypertension.

  5. Vagal innervation of the rat duodenum.

    Science.gov (United States)

    Zhang, X; Renehan, W E; Fogel, R

    2000-02-14

    Electrophysiologic and anterograde tract tracing studies have demonstrated that the vagus nerve innervates the duodenum. These studies, however, have provided little information regarding the finer anatomic topography within the vagal complex. In this study, the retrograde neuronal tracers WGA-HRP or DiI, applied to the duodenum, were used to characterize the vagal afferent and efferent innervation of this portion of the gastrointestinal tract. This approach labeled a substantial number of motor neurons in both the medial and lateral columns of the dorsal motor nucleus of the vagus (DMNV). Vagal motor neurons innervating the duodenum were seen across the medial-lateral extent of the DMNV and between 600 microm rostral to obex and 1600 microm caudal to obex. The three branches of the vagus nerve contained efferent fibers to the duodenum. The gastric branch of the vagus nerve was the pathway that connected the majority of DMNV neurons with the duodenum. These neurons were located in the medial and middle thirds of the DMNV. The celiac branch to the duodenum was composed of axons from the majority of lateral column neurons but also contained axons from neurons in the medial column. The hepatic branch of the vagus nerve contained only a small number of cell axons. Some neurons were located medially whereas others were in the lateral third of the duodenum. Although central terminations of vagal primary afferents from the duodenum were not found in previous tract tracing studies, we observed a large number of terminals in the subpostremal/commissural region of the nucleus of the solitary tract. Similar to the motor fibers, most afferent fibers from the duodenum were located in the gastric branch of the vagus nerve, although the hepatic and celiac branches also contained afferent neurons. These results demonstrate that the vagal innervation of the duodenum is unique, being an amalgam of what would be expected following labeling of more proximal and distal portions of the

  6. FAVORABLE OUTCOME IN IDIOPATHIC VENTRICULAR-FIBRILLATION WITH TREATMENT AIMED AT PREVENTION OF HIGH SYMPATHETIC TONE AND SUPPRESSION OF INDUCIBLE ARRHYTHMIAS

    NARCIS (Netherlands)

    CRIJNS, HJGM; WIESFELD, ACP; POSMA, JL; LIE, KI

    1995-01-01

    Objective-In the absence of an obvious cause for cardiac arrest, patients with idiopathic ventricular fibrillation are difficult to manage. A subset of patients has inducible arrhythmias. In others sympathetic excitation plays a role in the onset of the cardiac arrest. This study evaluates a prospec

  7. Development of neuropeptide Y-mediated heart innervation in rats.

    Science.gov (United States)

    Masliukov, Petr M; Moiseev, Konstantin; Emanuilov, Andrey I; Anikina, Tatyana A; Zverev, Alexey A; Nozdrachev, Alexandr D

    2016-02-01

    Neuropeptide Y (NPY) plays a trophic role in the nervous and vascular systems and in cardiac hypertrophy. However, there is no report concerning the expression of NPY and its receptors in the heart during postnatal development. In the current study, immunohistochemistry and Western blot analysis was used to label NPY, and Y1R, Y2R, and Y5R receptors in the heart tissue and intramural cardiac ganglia from rats of different ages (newborn, 10 days old, 20 days old, 30 days old, 60 days old, 1 year old, and 2 years old).The obtained data suggest age-dependent changes of NPY-mediated heart innervation. The density of NPY-immunoreactive (IR) fibers was the least in newborn animals and increased in the first 20 days of life. In the atria of newborn and 10-day-old rats, NPY-IR fibers were more abundant compared with the ventricles. The vast majority of NPY-IR fibers also contained tyrosine hydroxylase, a key enzyme in catecholamine synthesis.The expression of Y1R increased between 10 and 20 days of life. Faint Y2R immunoreactivity was observed in the atria and ventricles of 20-day-old and older rats. In contrast, the highest level of the expression of Y5R was found in newborn pups comparing with more adult rats. All intramural ganglionic neurons were also Y1R-IR and Y5R-IR and Y2R-negative in all studied animals.Thus, the increasing of density of NPY-containing nerve fibers accompanies changes in relation of different subtypes of NPY receptors in the heart during development.

  8. Progress in the study of vagal control of cardiac ventricles%迷走神经对心室功能的调控机制研究进展

    Institute of Scientific and Technical Information of China (English)

    臧伟进; 陈莉娜; 于晓江

    2005-01-01

    自主神经系统由交感神经系统和副交感神经系统(迷走神经)组成,二者相互拮抗,对哺乳动物心脏的功能调控具有重要的作用.副交感(迷走)神经对心房可产生变时、变传导和变力作用,但是对心室的支配及对心室的调控作用还不清楚.一直以来都存在一个误解,认为交感神经支配心脏的各个部位而副交感神经仅支配心脏的室上性组织,对心室没有支配.近年来的研究显示在一些哺乳动物的心脏上,胆碱能神经在心室也有分布,且对左心室的功能有重要的调控作用.本文从解剖及组织化学、分子生物学和功能学三个方面阐述迷走神经对心室的支配及调控证据,并对心室收缩功能的迷走神经(毒蕈碱)调控及其信号转导途径进行综述.%Autonomic nervous system plays an important role in the regulation of mammalian heart, and it is divided into the sympathetic and parasympathetic (vagal) subsystems. The parasympathetic (vagal) control of the atria involves modulation of chronotropic, dromotropic and inotropic activities, but the role of the parasympathetic innervation of the ventricles is still unclear.There is a common misconception that the sympathetic nerves innervate all over the heart; while the parasympathetic nerves only innervate the superventricular part of the heart, but not the ventricles. Recent evidence indicates that the cholinergic innervation of the left ventricle is functionally very important in some mammalian species. The present article reviews the evidence of vagal control in the ventricles from the anatomy and histochemistry, molecular biology, and function areas. Additionally we overview the vagal (muscarinic)regulation of cardiac contractile function and its signal transduction.

  9. The Role of Neuromediators and Innervation in Cutaneous Wound Healing.

    Science.gov (United States)

    Ashrafi, Mohammed; Baguneid, Mohamed; Bayat, Ardeshir

    2016-06-15

    The skin is densely innervated with an intricate network of cutaneous nerves, neuromediators and specific receptors which influence a variety of physiological and disease processes. There is emerging evidence that cutaneous innervation may play an important role in mediating wound healing. This review aims to comprehensively examine the evidence that signifies the role of innervation during the overlapping stages of cutaneous wound healing. Numerous neuropeptides that are secreted by the sensory and autonomic nerve fibres play an essential part during the distinct phases of wound healing. Delayed wound healing in diabetes and fetal cutaneous regeneration following wounding further highlights the pivotal role skin innervation and its associated neuromediators play in wound healing. Understanding the mechanisms via which cutaneous innervation modulates wound healing in both the adult and fetus will provide opportunities to develop therapeutic devices which could manipulate skin innervation to aid wound healing.

  10. Relationship between quantitative cardiac neuronal imaging with {sup 123}I-meta-iodobenzylguanidine and hospitalization in patients with heart failure

    Energy Technology Data Exchange (ETDEWEB)

    Parker, Matthew W.; Sood, Nitesh [University of Connecticut, School of Medicine Department of Medicine, Farmington, CT (United States); Hartford Hospital, Division of Cardiology, Hartford, CT (United States); Ahlberg, Alan W. [Hartford Hospital, Division of Cardiology, Hartford, CT (United States); Jacobson, Arnold F. [GE Healthcare, Princeton, NJ (United States); Heller, Gary V. [The Intersocietal Accreditation Commission, Ellicott City, MD (United States); Lundbye, Justin B. [University of Connecticut, School of Medicine Department of Medicine, Farmington, CT (United States); The Hospital of Central Connecticut, Division of Cardiology, New Britain, CT (United States)

    2014-09-15

    Hospitalization in patients with systolic heart failure is associated with morbidity, mortality, and cost. Myocardial sympathetic innervation, imaged by {sup 123}I-meta-iodobenzylguanidine ({sup 123}I-mIBG), has been associated with cardiac events in a recent multicenter study. The present analysis explored the relationship between {sup 123}I-mIBG imaging findings and hospitalization. Source documents from the ADMIRE-HF trial were reviewed to identify hospitalization events in patients with systolic heart failure following cardiac neuronal imaging using {sup 123}I-mIBG. Time to hospitalization was analyzed with the Kaplan-Meier method and compared to the mIBG heart-to-mediastinum (H/M) ratio using multiple-failure Cox regression. During 1.4 years of median follow-up, 362 end-point hospitalizations occurred in 207 of 961 subjects, 79 % of whom had H/M ratio <1.6. Among subjects hospitalized for any cause, 88 % had H/M ratio <1.6 and subjects with H/M ratio <1.6 experienced hospitalization earlier than subjects with higher H/M ratios (log-rank p = 0.003). After adjusting for elevated brain natriuretic peptide (BNP) and time since heart failure diagnosis, a low mIBG H/M ratio was associated with cardiac-related hospitalization (HR 1.48, 95 % CI 1.05 - 2.0; p = 0.02). The mIBG H/M ratio may risk-stratify patients with heart failure for cardiac-related hospitalization, especially when used in conjunction with BNP. Further studies are warranted to examine these relationships. (orig.)

  11. Intrinsic innervation and dopaminergic markers after experimental denervation in rat thymus

    Directory of Open Access Journals (Sweden)

    F. Mignini

    2010-04-01

    Full Text Available The aim of this study was to examine rat thymus innervation using denervation techniques and to explore the related micro-anatomical localization of dopamine, D1, D2 receptors and dopamine membrane transporter (DAT. In the thymus subcapsular region, the parenchymal cholinergic fibers belong exclusively to phrenic nerve branching. No somatic phrenic nerve branching was detected in any other analysed thymus lobule regions. In rats subjected to sympathetic or parasympathetic ablation, it was observed that catecholaminergic and cholinergic nerve fibers respectively contributed to forming plexuses along vessel walls. In the subcapsular and septal region, no parenchymal nerve branching, belonging to sympathetic or parasympathetic nervous system was noted. Instead, in the deep cortical region, cortico-medullary junction (CM-j and medulla, catecholaminergic and cholinergic nerve fibers were detected along the vessels and parenchyma. Dopamine and dopamine receptors were widely diffused in the lobular cortico-medullary junction region and in the medulla, where the final steps of thymocyte maturation and their trafficking take place. No variation in dopamine and DAT immune reaction was observed following total or partial parasympathectomy or phrenic nerve cutting. After chemical or surgical sympathectomy however, neither dopamine nor DAT immune reaction was noted again. Instead, D1 and D2 dopamine receptor expression was not affected by thymus denervation. In rats subjected to specific denervation, it was observed the direct intraparenchymal branching of the phrenic nerve and sympathetic and parasympathetic fibers into thymus parenchyma along vessels. These findings on the dopaminergic system highlight the importance of neurotransmitter receptor expression in the homeostasis of neuroimmune modulation.

  12. Intrinsic innervation and dopaminergic markers after experimental denervation in rat thymus.

    Science.gov (United States)

    Mignini, F; Sabbatini, M; D'Andrea, V; Cavallotti, C

    2010-04-15

    The aim of this study was to examine rat thymus innervation using denervation techniques and to explore the related micro-anatomical localization of dopamine, D1, D2 receptors and dopamine membrane transporter (DAT). In the thymus subcapsular region, the parenchymal cholinergic fibers belong exclusively to phrenic nerve branching. No somatic phrenic nerve branching was detected in any other analysed thymus lobule regions. In rats subjected to sympathetic or parasympathetic ablation, it was observed that catecholaminergic and cholinergic nerve fibers respectively contributed to forming plexuses along vessel walls. In the subcapsular and septal region, no parenchymal nerve branching, belonging to sympathetic or parasympathetic nervous system was noted. Instead, in the deep cortical region, cortico-medullary junction (CM-j) and medulla, catecholaminergic and cholinergic nerve fibers were detected along the vessels and parenchyma. Dopamine and dopamine receptors were widely diffused in the lobular cortico-medullary junction region and in the medulla, where the final steps of thymocyte maturation and their trafficking take place. No variation in dopamine and DAT immune reaction was observed following total or partial parasympathectomy or phrenic nerve cutting. After chemical or surgical sympathectomy however, neither dopamine nor DAT immune reaction was noted again. Instead, D1 and D2 dopamine receptor expression was not affected by thymus denervation. In rats subjected to specific denervation, it was observed the direct intraparenchymal branching of the phrenic nerve and sympathetic and parasympathetic fibers into thymus parenchyma along vessels. These findings on the dopaminergic system highlight the importance of neurotransmitter receptor expression in the homeostasis of neuroimmune modulation.

  13. Sympathetic crashing acute pulmonary edema.

    Science.gov (United States)

    Agrawal, Naman; Kumar, Akshay; Aggarwal, Praveen; Jamshed, Nayer

    2016-12-01

    Sympathetic crashing acute pulmonary edema (SCAPE) is the extreme end of the spectrum of acute pulmonary edema. It is important to understand this disease as it is relatively common in the emergency department (ED) and has better outcomes when managed appropriately. The patients have an abrupt redistribution of fluid in the lungs, and when treated promptly and effectively, these patients will rapidly recover. Noninvasive ventilation and intravenous nitrates are the mainstay of treatment which should be started within minutes of the patient's arrival to the ED. Use of morphine and intravenous loop diuretics, although popular, has poor scientific evidence.

  14. Sympathetic blocks for visceral cancer pain management

    DEFF Research Database (Denmark)

    Mercadante, Sebastiano; Klepstad, Pal; Kurita, Geana Paula

    2015-01-01

    The neurolytic blocks of sympathetic pathways, including celiac plexus block (CPB) and superior hypogastric plexus block (SHPB) , have been used for years. The aim of this review was to assess the evidence to support the performance of sympathetic blocks in cancer patients with abdominal visceral...

  15. Sympathetic vasoconstrictor nerve function in alcoholic neuropathy

    DEFF Research Database (Denmark)

    Jensen, K; Andersen, K; Smith, T;

    1984-01-01

    The peripheral sympathetic vasomotor nerve function was investigated in 18 male chronic alcoholics admitted for intellectual impairment or polyneuropathy. By means of the local 133Xenon washout technique, the sympathetic veno-arteriolar axon-reflex was studied. This normally is responsible for a ...

  16. Sympathetic actions on the skeletal muscle.

    Science.gov (United States)

    Roatta, Silvestro; Farina, Dario

    2010-01-01

    The sympathetic nervous system (SNS) modulates several functions in skeletal muscle fibers, including metabolism, ionic transport across the membrane, and contractility. These actions, together with the sympathetic control of other organ systems, support intense motor activity. However, some SNS actions on skeletal muscles may not always be functionally advantageous. Implications for motor control and sport performance are discussed.

  17. Adaptive reaction of boys’ sympathetic-adrenal system to physical activity in puberty.

    Directory of Open Access Journals (Sweden)

    Alekcei Anatolevich Zverev

    2016-04-01

    Full Text Available This paper deals with the study of adaptive reactions of the sympathetic-adrenal system of 11-16-year-old boys to graduated exercise at different pubertal stages. To evaluate the functional state of the cardiovascular system, the heart rate, systolic and cardiac output were determined. The state of the sympathetic-adrenal system was analyzed by the excretion level of catecholamines and DOPA. Cardiac output in response to graduated exercise in boys at pubertal stages 1-2 is substantially ensured by the increased heart rate, and at the other stages of puberty - mainly due to increase in stroke volume, which is estimated as a favorable response to exercise. In mechanisms of urgent adaptation to graduated exercise, the boys of third and fourth pubertal stages show an intensive functioning of the cardiovascular system and a reducing reserve capacity of the sympathetic-adrenal system. The adolescents of fifth pubertal stage show economical response to functional tests, a reduced reactivity of the components of the sympathetic-adrenal system on the background of a significant increase in the excretion of precursors.

  18. Human muscle sympathetic neural and haemodynamic responses to tilt following spaceflight

    Science.gov (United States)

    Levine, Benjamin D.; Pawelczyk, James A.; Ertl, Andrew C.; Cox, James F.; Zuckerman, Julie H.; Diedrich, Andre; Biaggioni, Italo; Ray, Chester A.; Smith, Michael L.; Iwase, Satoshi; Saito, Mitsuru; Sugiyama, Yoshiki; Mano, Tadaaki; Zhang, Rong; Iwasaki, Kenichi; Lane, Lynda D.; Buckey, Jay C Jr; Cooke, William H.; Baisch, Friedhelm J.; Eckberg, Dwain L.; Blomqvist, C. Gunnar

    2002-01-01

    Orthostatic intolerance is common when astronauts return to Earth: after brief spaceflight, up to two-thirds are unable to remain standing for 10 min. Previous research suggests that susceptible individuals are unable to increase their systemic vascular resistance and plasma noradrenaline concentrations above pre-flight upright levels. In this study, we tested the hypothesis that adaptation to the microgravity of space impairs sympathetic neural responses to upright posture on Earth. We studied six astronauts approximately 72 and 23 days before and on landing day after the 16 day Neurolab space shuttle mission. We measured heart rate, arterial pressure and cardiac output, and calculated stroke volume and total peripheral resistance, during supine rest and 10 min of 60 deg upright tilt. Muscle sympathetic nerve activity was recorded in five subjects, as a direct measure of sympathetic nervous system responses. As in previous studies, mean (+/- S.E.M.) stroke volume was lower (46 +/- 5 vs. 76 +/- 3 ml, P = 0.017) and heart rate was higher (93 +/- 1 vs. 74 +/- 4 beats min(-1), P = 0.002) during tilt after spaceflight than before spaceflight. Total peripheral resistance during tilt post flight was higher in some, but not all astronauts (1674 +/- 256 vs. 1372 +/- 62 dynes s cm(-5), P = 0.32). No crew member exhibited orthostatic hypotension or presyncopal symptoms during the 10 min of postflight tilting. Muscle sympathetic nerve activity was higher post flight in all subjects, in supine (27 +/- 4 vs. 17 +/- 2 bursts min(-1), P = 0.04) and tilted (46 +/- 4 vs. 38 +/- 3 bursts min(-1), P = 0.01) positions. A strong (r(2) = 0.91-1.00) linear correlation between left ventricular stroke volume and muscle sympathetic nerve activity suggested that sympathetic responses were appropriate for the haemodynamic challenge of upright tilt and were unaffected by spaceflight. We conclude that after 16 days of spaceflight, muscle sympathetic nerve responses to upright tilt are normal.

  19. Estimated central blood volume in cirrhosis: relationship to sympathetic nervous activity, beta-adrenergic blockade and atrial natriuretic factor

    DEFF Research Database (Denmark)

    Henriksen, Jens Henrik; Bendtsen, Flemming; Gerbes, A L

    1992-01-01

    The estimated central blood volume (i.e., blood volume in the heart cavities, lungs and central arterial tree) was determined by multiplying cardiac output by circulatory mean transit time in 19 patients with cirrhosis and compared with sympathetic nervous activity and circulating level of atrial...

  20. Nuclear imaging in cardiac amyloidosis

    Energy Technology Data Exchange (ETDEWEB)

    Glaudemans, A.W.J.M.; Slart, R.H.J.A.; Veltman, N.C.; Dierckx, R.A.J.O. [University Medical Center Groningen, Department of Nuclear Medicine and Molecular Imaging, Hanzeplein 1, P.O. Box 30001, Groningen (Netherlands); Zeebregts, C.J. [University Medical Center Groningen, Department of Surgery (Division of Vascular Surgery), Groningen (Netherlands); Tio, R.A. [University Medical Center Groningen, Department of Cardiology, Groningen (Netherlands); Hazenberg, B.P.C. [University Medical Center Groningen, Department of Rheumatology and Clinical Immunology, Groningen (Netherlands)

    2009-04-15

    Amyloidosis is a disease characterized by depositions of amyloid in organs and tissues. It can be localized (in just one organ) or systemic. Cardiac amyloidosis is a debilitating disease and can lead to arrhythmias, deterioration of heart function and even sudden death. We reviewed PubMed/Medline, without time constraints, on the different nuclear imaging modalities that are used to visualize myocardial amyloid involvement. Several SPECT tracers have been used for this purpose. The results with these tracers in the evaluation of myocardial amyloidosis and their mechanisms of action are described. Most clinical evidence was found for the use of {sup 123}I-MIBG. Myocardial defects in MIBG activity seem to correlate well with impaired cardiac sympathetic nerve endings due to amyloid deposits. {sup 123}I-MIBG is an attractive option for objective evaluation of cardiac sympathetic level and may play an important role in the indirect measurement of the effect of amyloid myocardial infiltration. Other, less sensitive, options are {sup 99m}Tc-aprotinin for imaging amyloid deposits and perhaps {sup 99m}Tc-labelled phosphate derivatives, especially in the differential diagnosis of the aetiology of cardiac amyloidosis. PET tracers, despite the advantage of absolute quantification and higher resolution, are not yet well evaluated for the study of cardiac amyloidosis. Because of these advantages, there is still the need for further research in this field. (orig.)

  1. Role of autoinhibitory feedback in cardiac sympathetic transmission

    Energy Technology Data Exchange (ETDEWEB)

    Angus, J.A.; Korner, P.I.; Jackman, G.P.; Bobik, A.; Kopin, I.J.

    1984-01-01

    The relationship between two indices of transmitter release measured simultaneously and the frequency of 4 field pulses (0.125-2 Hz) were obtained from superfused guinea pig right atria after labelling with /sup 3/H-noradrenaline. The relationships between /sup 3/H-efflux or rate responses and frequency were hyperbolic. Autoinhibitory feedback did not play a role since phentolamine (1 microM) did not alter the /sup 3/H-efflux or rate responses to 4 field pulses that gave 50-60% of the maximum rate response. In the presence of neuronal uptake block (desipramine (0.1 microM) phentolamine enhanced /sup 3/H-efflux and rate responses to 4 field pulses at all frequencies. In the absence of desipramine prolonged trains of field pulses (8-12 pulses) at low frequency (0.25 Hz) were not sufficient to activate autoinhibitory feedback. At 2 Hz phentolamine enhanced both responses at 12 field pulses. We conclude that in the right atrium autoinhibitory feedback plays little role in the modulation of transmitter release at levels of stimulation that cause 50-60% of maximum tissue response. The presence of neuronal uptake inhibition or high stimulus strengths are necessary to evoke autoinhibitory feedback.

  2. Innervation of the renal proximal convoluted tubule of the rat

    Energy Technology Data Exchange (ETDEWEB)

    Barajas, L.; Powers, K. (Harbor-UCLA Medical Center, Torrance (USA))

    1989-12-01

    Experimental data suggest the proximal tubule as a major site of neurogenic influence on tubular function. The functional and anatomical axial heterogeneity of the proximal tubule prompted this study of the distribution of innervation sites along the early, mid, and late proximal convoluted tubule (PCT) of the rat. Serial section autoradiograms, with tritiated norepinephrine serving as a marker for monoaminergic nerves, were used in this study. Freehand clay models and graphic reconstructions of proximal tubules permitted a rough estimation of the location of the innervation sites along the PCT. In the subcapsular nephrons, the early PCT (first third) was devoid of innervation sites with most of the innervation occurring in the mid (middle third) and in the late (last third) PCT. Innervation sites were found in the early PCT in nephrons located deeper in the cortex. In juxtamedullary nephrons, innervation sites could be observed on the PCT as it left the glomerulus. This gradient of PCT innervation can be explained by the different tubulovascular relationships of nephrons at different levels of the cortex. The absence of innervation sites in the early PCT of subcapsular nephrons suggests that any influence of the renal nerves on the early PCT might be due to an effect of neurotransmitter released from renal nerves reaching the early PCT via the interstitium and/or capillaries.

  3. INNERVATED RECTUS-ABDOMINIS MYOFASCIAL FLAP FOR DYNAMIC CARDIOMYOPLASTY

    NARCIS (Netherlands)

    WIJNBERG, DS; EBELS, T; ROBINSON, PH

    1994-01-01

    This study examined the rectus abdominis myofascial flap as an innervated nap for dynamic cardiomyoplastic purposes. It is common to use the latissimus dorsi to wrap or patch around or in the heart, but there is a need for more innervated skeletal muscle for a variety of reasons. The rectus abdomini

  4. Endometriosis as a neurovascular condition: estrous variations in innervation, vascularization, and growth factor content of ectopic endometrial cysts in the rat.

    Science.gov (United States)

    Zhang, Guohua; Dmitrieva, Natalia; Liu, Yan; McGinty, Kristina A; Berkley, Karen J

    2008-01-01

    Endometriosis is a poorly understood, estradiol-dependent condition associated with severe pelvic pains and defined by vascularized endometrial growths outside the uterus. Endometriosis is produced in cycling rats by autotransplanting pieces of uterus onto abdominal arteries where they develop into cysts. The surgery induces vaginal and abdominal muscle hyperalgesia, whose severity is greatest in proestrus and nearly absent in estrus. The cysts contain growth factors and cytokines and develop their own sympathetic and sensory C- and Adelta-fiber innervation. Here, we used quantitative immunostaining and protein array analyses to test the hypothesis that the innervation and growth factor/cytokine content of the cysts, but not uterine horn, contribute to proestrous-to-estrous changes in hyperalgesic severity. If so, these characteristics in the cysts, but not the uterine horn, should change with estrous stage. In cysts, the density of sympathetic (but not sensory) neurites and amounts of NGF and VEGF proteins (but not cytokines IL-1, IL-6, IL-10, or TNF-alpha) were greater in proestrus than estrus. These changes were accompanied by vascular changes. Both sympathetic and sensory fibers in both stages colabeled with TrkA, indicating that changes in NGF could act on both afferent and efferent fibers. In contrast with the cysts, no changes occurred in the uterine horn between proestrus and estrus. Together, these results suggest that coordinated proestrous-to-estrous changes in innervation and vascularization of the cysts contribute to similar changes in hyperalgesic severity. The findings also encourage consideration of endometriosis as a neurovascular condition.

  5. Dual innervation of neonatal Merkel cells in mouse touch domes.

    Directory of Open Access Journals (Sweden)

    Jingwen Niu

    Full Text Available Merkel cell-neurite complexes are specialized mechanosensory end organs that mediate discriminative touch sensation. It is well established that type I slowly adapting (SAI mechanoreceptors, which express neural filament heavy chain (NFH, innervate Merkel cells. It was previously shown that neurotrophic factor NT3 and its receptor TrkC play crucial roles in controlling touch dome Merkel cell innervation of NFH+ fibers. In addition, nerve fibers expressing another neurotrophic tyrosine receptor kinase (NTRK, Ret, innervate touch dome Merkel cells as well. However, the relationship between afferents responsive to NT3/TrkC signaling and those expressing Ret is unclear. It is also controversial if these Ret+ fibers belong to the early or late Ret+ DRG neurons, which are defined based on the co-expression and developmental dependence of TrkA. To address these questions, we genetically traced Ret+ and TrkC+ fibers and analyzed their developmental dependence on TrkA. We found that Merkel cells in neonatal mouse touch domes receive innervation of two types of fibers: one group is Ret+, while the other subset expresses TrkC and NFH. In addition, Ret+ fibers depend on TrkA for their survival and normal innervation whereas NFH+ Merkel cell innervating fibers are almost unaltered in TrkA mutant mice, supporting that Ret+ and NFH+/TrkC+ afferents are two distinct groups. Ret signaling, on the other hand, plays a minor role for the innervation of neonatal touch domes. In contrast, Merkel cells in the glabrous skin are mainly contacted by NFH+/TrkC+ afferents. Taken together, our results suggest that neonatal Merkel cells around hair follicles receive dual innervation while Merkel cells in the glabrous skin are mainly innervated by only SAI mechanoreceptors. In addition, our results suggest that neonatal Ret+ Merkel cell innervating fibers most likely belong to the late but not early Ret+ DRG neurons.

  6. Cardiac Autonomic Nerve Stimulation in the Treatment of Heart Failure

    OpenAIRE

    Kobayashi, Mariko; Massiello, Alex; Karimov, Jamshid H.; Van Wagoner, David R.; Fukamachi, Kiyotaka

    2013-01-01

    Research on the therapeutic modulation of cardiac autonomic tone by electrical stimulation has yielded encouraging early clinical results. Vagus nerve stimulation has reduced the rates of morbidity and sudden death from heart failure, but therapeutic vagus nerve stimulation is limited by side effects of hypotension and bradycardia. Sympathetic nerve stimulation that has been implemented in the experiment may exacerbate the sympathetic-dominated autonomic imbalance. In contrast, concurrent sti...

  7. Autonomic markers of emotional processing: skin sympathetic nerve activity in humans during exposure to emotionally-charged images

    Directory of Open Access Journals (Sweden)

    Rachael eBrown

    2012-10-01

    Full Text Available The sympathetic innervation of the skin primarily subserves thermoregulation, but the system has also been commandeered as a means of expressing emotion. While it is known that the level of skin sympathetic nerve activity (SSNA is affected by anxiety, the majority of emotional studies have utilized the galvanic skin response as a means of inferring increases in SSNA. The purpose of the present study was to characterize the changes in SSNA when showing subjects neutral or emotionally-charged images from the International Affective Picture System. Skin sympathetic nerve activity was recorded via tungsten microelectrodes inserted into cutaneous fascicles of the common peroneal nerve in ten subjects. Neutral images, positively-charged images (erotica or negatively-charged images (mutilation were presented in blocks of fifteen images of a specific type, each block lasting two minutes. Images of erotica or mutilation were presented in a quasi-random fashion, each block following a block of neutral images. Both images of erotica or images of mutilation caused significant increases in SSNA, but the increases in SSNA were greater for mutilation. The increases in SSNA were often coupled with sweat release and cutaneous vasoconstriction, however, these markers were not always consistent with the SSNA increases. We conclude that SSNA, comprising cutaneous vasoconstrictor and sudomotor activity, increases with both positively-charged and negatively-charged emotional images. Measurement of SSNA provides a more comprehensive assessment of sympathetic outflow to the skin than does the use of sweat release alone as a marker of emotional processing.

  8. Innervation of the sheep pineal gland by nonsympathetic nerve fibers containing NADPH-diaphorase activity

    DEFF Research Database (Denmark)

    López-Figueroa, Manuel O.; Ravault, Jean-Paul; Cozzi, Bruno;

    1997-01-01

    Neuroanatomy, NADPH-diaphorase, nitric oxide, innervation, superior cervical ganglionectomy, neuropeptide Y.......Neuroanatomy, NADPH-diaphorase, nitric oxide, innervation, superior cervical ganglionectomy, neuropeptide Y....

  9. The enteric nervous system and gastrointestinal innervation: integrated local and central control.

    Science.gov (United States)

    Furness, John B; Callaghan, Brid P; Rivera, Leni R; Cho, Hyun-Jung

    2014-01-01

    The digestive system is innervated through its connections with the central nervous system (CNS) and by the enteric nervous system (ENS) within the wall of the gastrointestinal tract. The ENS works in concert with CNS reflex and command centers and with neural pathways that pass through sympathetic ganglia to control digestive function. There is bidirectional information flow between the ENS and CNS and between the ENS and sympathetic prevertebral ganglia.The ENS in human contains 200-600 million neurons, distributed in many thousands of small ganglia, the great majority of which are found in two plexuses, the myenteric and submucosal plexuses. The myenteric plexus forms a continuous network that extends from the upper esophagus to the internal anal sphincter. Submucosal ganglia and connecting fiber bundles form plexuses in the small and large intestines, but not in the stomach and esophagus. The connections between the ENS and CNS are carried by the vagus and pelvic nerves and sympathetic pathways. Neurons also project from the ENS to prevertebral ganglia, the gallbladder, pancreas and trachea.The relative roles of the ENS and CNS differ considerably along the digestive tract. Movements of the striated muscle esophagus are determined by neural pattern generators in the CNS. Likewise the CNS has a major role in monitoring the state of the stomach and, in turn, controlling its contractile activity and acid secretion, through vago-vagal reflexes. In contrast, the ENS in the small intestine and colon contains full reflex circuits, including sensory neurons, interneurons and several classes of motor neuron, through which muscle activity, transmucosal fluid fluxes, local blood flow and other functions are controlled. The CNS has control of defecation, via the defecation centers in the lumbosacral spinal cord. The importance of the ENS is emphasized by the life-threatening effects of some ENS neuropathies. By contrast, removal of vagal or sympathetic connections with the

  10. Hydralazine tachycardia and sympathetic cardiovascular reactivity in normal subjects.

    Science.gov (United States)

    Vidrio, H; Tena, I

    1980-11-01

    The correlation between hydralazine-induced tachycardia and overall cardiovascular reactivity to sympathetic stimulation was explored in 50 normal subjects. Blood pressure and heart rate changes after standing, immersion of a hand in cold water, the Valsalva maneuver, and moderate exercise were compared with pressure and rate responses to 20 mg oral hydralazine. The drug did not modify blood pressure but increased heart rate, mainly in the standing position. Because plotting the magnitude of this response suggested a two-population distribution, subjects were divided into hyporeactor and hyperreactor groups. Reactivity did not appear to be related to acetylator phenotype. The magnitude of the cardiac response correlated with heart rate responses to standing and to the Valsalva maneuver; when analyzed separately from hyporeactors, correlation was greater among hyperreactors. Because the orthostatic and Valsalva responses are reflex in nature, these results suggest that hydralazine tachycardia is also reflexly induced, that its magnitude depends on individual baroreceptor sensitivity, which is distributed nonnormally, and that it can be predicted by suitable tests of sympathetic responsiveness.

  11. Afferent innervation of the utricular macula in pigeons

    Science.gov (United States)

    Si, Xiaohong; Zakir, Mridha Md; Dickman, J. David

    2003-01-01

    Biotinylated dextran amine (BDA) was used to retrogradely label afferents innervating the utricular macula in adult pigeons. The pigeon utriclar macula consists of a large rectangular-shaped neuroepithelium with a dorsally curved anterior edge and an extended medioposterior tail. The macula could be demarcated into several regions based on cytoarchitectural differences. The striola occupied 30% of the macula and contained a large density of type I hair cells with fewer type II hair cells. Medial and lateral extrastriola zones were located outside the striola and contained only type II hair cells. A six- to eight-cell-wide band of type II hair cells existed near the center of the striola. The reversal line marked by the morphological polarization of hair cells coursed throughout the epithelium, near the peripheral margin, and through the center of the type II band. Calyx afferents innervated type I hair cells with calyceal terminals that contained between 2 and 15 receptor cells. Calyx afferents were located only in the striola region, exclusive of the type II band, had small total fiber innervation areas and low innervation densities. Dimorph afferents innervated both type I and type II hair cells with calyceal and bouton terminals and were primarily located in the striola region. Dimorph afferents had smaller calyceal terminals with few type I hair cells, extended fiber branches with bouton terminals and larger innervation areas. Bouton afferents innervated only type II hair cells in the extrastriola and type II band regions. Bouton afferents innervating the type II band had smaller terminal fields with fewer bouton terminals and smaller innervation areas than fibers located in the extrastriolar zones. Bouton afferents had the most bouton terminals on the longest fibers, the largest innervation areas with the highest innervation densities of all afferents. Among all afferents, smaller terminal innervation fields were observed in the striola and large fields were

  12. Estrogen up-regulation of semaphorin 3F correlates with sympathetic denervation of the rat uterus.

    Science.gov (United States)

    Richeri, Analía; Chalar, Cora; Martínez, Gaby; Greif, Gonzalo; Bianchimano, Paola; Brauer, M Mónica

    2011-10-28

    Current evidence indicates that rises in systemic levels of estrogen create in the uterus an inhibitory environment for sympathetic nerves. However, molecular insights of these changes are far from complete. We evaluated if semaphorin 3F mRNA, a sympathetic nerve repellent, was produced by the rat uterus and if its expression was modulated by estrogen. We also analyzed whether uterine nerves express the semaphorin 3F binding receptor, neuropilin-2. Uterine levels of semaphorin 3F mRNA were measured using real time reverse transcriptase-polymerase chain reaction in prepubertal rat controls and following chronic estrogen treatment. Localization of semaphorin 3F transcripts was determined by in situ hybridization and the expression of neuropilin-2 was assessed by immunohistochemistry. These studies showed that: (1) chronic estrogen treatment led to a 5-fold induction of semaphorin 3F mRNA in the immature uterus; (2) estrogen provoked a tissue-specific induction of semaphorin 3F which was particularly localized in the connective tissue that borders muscle bundles and surrounds intrauterine blood vessels; (3) two major cell-types were recognized in the areas where transcripts were concentrated, fibroblast-like cells and infiltrating eosinophil leukocytes; and (4) some delicate nerve terminal profiles present in the estrogenized uterus were immunoreactive for neuropilin-2. Temporal and spatial expression patterns of semaphorin 3F/neuropilin-2 are consistent with a possible role of this guidance cue in the remodeling of uterine sympathetic innervation by estrogen. Though correlative in its nature, these data support a model whereby semaphorin 3F, in combination with other inhibitory molecules, converts the estrogenized myometrium to an inhospitable environment for sympathetic nerves.

  13. Effects of dexamethasone on estrogen- and pregnancy-induced plasticity in rat uterine sympathetic nerves.

    Science.gov (United States)

    Bianchimano, P; Frías, A I; Richeri, A; Brauer, M M

    2007-12-01

    Estrogen and glucocorticoids are known to evoke opposing effects on the uterus. We analyzed the effects of dexamethasone (DEX) on uterine sympathetic denervation elicited by short- and long-term exposure to estrogen of intact prepubertal rats. We also studied the effects of DEX on the physiological degeneration of uterine sympathetic nerves at term pregnancy. Changes in innervation were assessed quantitatively by using computer-assisted methods on uterine cryostat tissue sections stained for tyrosine hydroxylase. At 24 h following treatment of prepubertal rats (25 days of age) with 1 microg or 2.5 microg estrogen, marked increases in uterine size and reductions in the percentage nerve area were observed. Co-administration of DEX (4 mg/kg) attenuated both these short-term estrogen-induced effects. Treatment of 19-day-old rats with a single dose of 25 mug estrogen provoked, at 26 days of age, a 54% reduction in the total nerve area. This reduction was abolished by the co-administration of nine doses of DEX (0.5 mg/kg) at 18-26 days of age. Treatment of rats with the same regime of DEX alone increased the total nerve area by 46% of the control values. Studies of control pregnant rats revealed the unexpected presence of intrauterine nerve fibers at term. Treatment of pregnant rats with six doses of DEX (4 mg/kg) at 16-21 days of age had no effects on the density of uterine sympathetic nerves. These results suggest that DEX has growth-promoting effects on immature uterine sympathetic nerves and may antagonize the degenerative effects elicited by long-term exposure to estrogen.

  14. Partial sympathetic denervation of the rat epididymis permits fertilization but inhibits embryo development.

    Science.gov (United States)

    Ricker, D D; Crone, J K; Chamness, S L; Klinefelter, G R; Chang, T S

    1997-01-01

    The rat cauda epididymidis receives sympathetic innervation from the inferior mesenteric ganglion (IMG). We have previously demonstrated that surgical removal of the IMG and proximal hypogastric nerves (IMG denervation) results in significant and cauda-specific changes in epididymal sperm transport, sperm motility, luminal fluid protein composition, and tissue histology. In the present study we used natural mating trials and intrauterine insemination (IUI) techniques to determine whether or not IMG denervation affects male fertility and reproductive capacity. For the initial studies, adult male Sprague Dawley rats were mated with estrous females 1 and 4 weeks following IMG denervation. Nine days after mating, uterine implantation sites and corpora lutea (CL) were counted. In females mated with sham-operated control males, 85.8% of ovulated oocytes were fertilized and subsequently implanted. In contrast, females mated with IMG-denervated males 1 or 4 weeks following surgery had 0% and 3.5%, respectively, of ovulated oocytes fertilized and implanted. For rats maintained 21 days after mating, an average of 13 +/- 1 pups were delivered by each of nine females mated with sham-operated control male rats; whereas, only seven morphologically normal pups were delivered by one of 14 females mated with IMG-denervated male rats. Additional experiments demonstrated that the decrement in offspring was, in part, due to a significant decrease in the number of spermatozoa in the female uterus following mating with IMG-denervated males. To determine whether IMG denervation exerted an additional effect directly on the fertilizing ability of spermatozoa, IUI experiments were performed. Six million cauda epididymal spermatozoa from 1- or 4-week IMG-denervated males were inseminated into the uterine horns of luteinzing hormone-releasing hormone (LHRH)-synchronized females and 9 days later implantation sites and CL were counted. Implantations were observed for 78%, 28%, and 25% of

  15. A model for magnetically coupled sympathetic eruptions

    CERN Document Server

    Torok, T; Titov, V S; Mikic, Z; Reeves, K K; Velli, M; Linker, J A; De Toma, G

    2011-01-01

    Sympathetic eruptions on the Sun have been observed for several decades, but the mechanisms by which one eruption can trigger another one remain poorly understood. We present a 3D MHD simulation that suggests two possible magnetic trigger mechanisms for sympathetic eruptions. We consider a configuration that contains two coronal flux ropes located within a pseudo-streamer and one rope located next to it. A sequence of eruptions is initiated by triggering the eruption of the flux rope next to the streamer. The expansion of the rope leads to two consecutive reconnection events, each of which triggers the eruption of a flux rope by removing a sufficient amount of overlying flux. The simulation qualitatively reproduces important aspects of the global sympathetic event on 2010 August 1 and provides a scenario for so-called twin filament eruptions. The suggested mechanisms are applicable also for sympathetic eruptions occurring in other magnetic configurations.

  16. Innervation of the thick ascending limb of Henle

    Energy Technology Data Exchange (ETDEWEB)

    Barajas, L.; Powers, K.V.

    1988-08-01

    The overlap of accumulations of autoradiographic grains (AAGs) on profiles of the thick ascending limb of Henle (TALH) was measured in autoradiograms of sections from rat kidneys with monoaminergic nerves labeled by means of tritiated norepinephrine. The amount of AAG overlap was used as an indirect means of quantifying innervation along the TALHs of superficial, mid-cortical, and juxtamedullary nephrons. The density of innervation along the TALH showed nephron heterogeneity; the juxtamedullary nephrons with a high pre- and postjuxtaglomerular apparatus (JGA) TALH density of innervation and the upper and midcortical nephrons with high TALH innervation densities at the level of the JGA. The pre-JGA TALH of the juxtamedullary nephrons had a significantly higher (P less than 0.001) density of innervation than the midcortical or superficial nephrons. The TALHs of juxtamedullary nephrons were found to have substantially more innervation than the TALHs of the other nephrons. For all three populations of nephrons, the pre-JGA TALH had the greatest amount of innervation. Neural regulation of TALH function would occur mainly along the pre-JGA and level of the JGA TALH. This regulation would increase TALH NaCl reabsorption (decrease luminal NaCl concentration) and therefore influence 1) the urinary concentrating mechanism, and 2) renin secretion via the macula densa mechanism. The innervation of the TALH was predominantly associated with the vasculature of the TALH's own nephron. However, innervation associated with medullary ray capillary beds from deeper nephrons was observed on pre-JGA TALHs from superficial and midcortical nephrons.

  17. Intrinsic innervation of the uterus in guinea pig and rat.

    Science.gov (United States)

    Mustafa, F; Fatani, J A; el-Eishi, H; el-Badawi, M G

    1987-01-01

    The pattern of distribution of cholinergic and adrenergic nerves in the uterus of albino rats and guinea pigs was examined histochemically. In the albino rat, the uterus was found well-innervated by both adrenergic and cholinergic nerves with a clear regional variation. Dense innervation was demonstrated at the tubal and cervical ends of the uterus and in the cervix. Cholinergic nerves supplying the glands were more numerous than the adrenergic nerves which were relatively few. In the guinea-pigs, the uterus was richly innervated by adrenergic nerves with a clear regional variation. No cholinesterase-positive nerves or nerve cells were demonstrated.

  18. Development and validation of a direct-comparison method for cardiac {sup 123}I-metaiodobenzylguanidine washout rates derived from late 3-hour and 4-hour imaging

    Energy Technology Data Exchange (ETDEWEB)

    Okuda, Koichi; Hashimoto, Mitsumasa [Kanazawa Medical University, Department of Physics, Kahoku, Ishikawa (Japan); Nakajima, Kenichi; Matsuo, Shinro; Taki, Junichi; Kinuya, Seigo [Kanazawa University Hospital, Department of Nuclear Medicine, Kanazawa, Ishikawa (Japan); Sugino, Shuichi [Okayama Kyokuto Hospital, Department of Radiology, Okayama, Okayama (Japan); Kirihara, Yumiko [FUJIFILM RI Pharma Co., Ltd., Chuo-Ku, Tokyo (Japan)

    2016-02-15

    The washout rate (WR) has been used in {sup 123}I-metaiodobenzylguanidine (MIBG) imaging to evaluate cardiac sympathetic innervation. However, WR varies depending on the time between the early and late MIBG scans. Late scans are performed at either 3 or 4 hours after injection of MIBG. The aim of this study was to directly compare the WR at 3 hours (WR{sub 3h}) with the WR at 4 hours (WR{sub 4h}). We hypothesized that the cardiac count would reduce linearly between the 3-hour and 4-hour scans. A linear regression model for cardiac counts at two time-points was generated. We enrolled a total of 96 patients who underwent planar {sup 123}I-MIBG scintigraphy early (15 min) and during the late phase at both 3 and 4 hours. Patients were randomly divided into two groups: a model-creation group (group 1) and a clinical validation group (group 2). Cardiac counts at 15 minutes (count{sub early}), 3 hours (count{sub 3h}) and 4 hours (count{sub 4h}) were measured. Cardiac count{sub 4h} was mathematically estimated using the linear regression model from count{sub early} and count{sub 3h}. In group 1, the actual cardiac count{sub 4h}/count{sub early} was highly significantly correlated with count{sub 3h}/count{sub early} (r = 0.979). In group 2, the average estimated count{sub 4h} was 92.8 ± 31.9, and there was no significant difference between this value and the actual count{sub 4h} (91.9 ± 31.9). Bland-Altman analysis revealed a small bias of -0.9 with 95 % limits of agreement of -6.2 and +4.3. WR{sub 4h} calculated using the estimated cardiac count{sub 4h} was comparable to the actual WR{sub 4h} (24.3 ± 9.6 % vs. 25.1 ± 9.7 %, p = ns). Bland-Altman analysis and the intraclass correlation coefficient showed that there was excellent agreement between the estimated and actual WR{sub 4h}. The linear regression model that we used accurately estimated cardiac count{sub 4h} using count{sub early} and count{sub 3h}. Moreover, WR{sub 4h} that was mathematically calculated using

  19. Thin-fiber mechanoreceptors reflexly increase renal sympathetic nerve activity during static contraction.

    Science.gov (United States)

    Kim, Jong Kyung; Hayes, Shawn G; Kindig, Angela E; Kaufman, Marc P

    2007-02-01

    The renal vasoconstriction induced by the sympathetic outflow during exercise serves to direct blood flow from the kidney toward the exercising muscles. The renal circulation seems to be particularly important in this regard, because it receives a substantial part of the cardiac output, which in resting humans has been estimated to be 20%. The role of group III mechanoreceptors in causing the reflex renal sympathetic response to static contraction remains an open question. To shed some light on this question, we recorded the renal sympathetic nerve responses to static contraction before and after injection of gadolinium into the arterial supply of the statically contracting triceps surae muscles of decerebrate unanesthetized and chloralose-anesthetized cats. Gadolinium has been shown to be a selective blocker of mechanogated channels in thin-fiber muscle afferents, which comprise the afferent arm of the exercise pressor reflex arc. In decerebrate (n = 15) and chloralose-anesthetized (n = 12) cats, we found that gadolinium (10 mM; 1 ml) significantly attenuated the renal sympathetic nerve and pressor responses to static contraction (60 s) after a latent period of 60 min; both responses recovered after a latent period of 120 min. We conclude that thin-fiber mechanoreceptors supplying contracting muscle are involved in some of the renal vasoconstriction evoked by the exercise pressor reflex.

  20. Innervation of ectopic endometrium in a rat model of endometriosis

    OpenAIRE

    Berkley, Karen J; Dmitrieva, Natalia; Curtis, Kathleen S.; Papka, Raymond E

    2004-01-01

    Endometriosis (ENDO) is a disorder in which vascularized growths of endometrial tissue occur outside the uterus. Its symptoms include reduced fertility and severe pelvic pain. Mechanisms that maintain the ectopic growths and evoke symptoms are poorly understood. One factor not yet considered is that the ectopic growths develop their own innervation. Here, we tested the hypothesis that the growths develop both an autonomic and a sensory innervation. We used a rat model of surgically induced EN...

  1. Cardiac arrhythmias

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    2008407 Effects of sympathetic nerve stimulation on connexin43 and ventricular arrhythmias during acute myocardial ischemia: experiment with rats. HU Xiaorong(胡笑容), et al. Dept Cardiol, Renmin Hosp, Wuhan Univ, Wuhan 430060. Natl Med J China 2008;88(24):1707-1710. Objective To investigate the effects of sympathetic nerve stimulation (SNS) on connexin43 (Cx43) and ventricular arrhythmias during acute myocardial ischemia (MI).

  2. The Involvement of Parasympathetic and Sympathetic Nerve in the Inflammatory Reflex.

    Science.gov (United States)

    Pereira, Mariana Rodrigues; Leite, Paulo Emílio Corrêa

    2016-09-01

    Production of inflammatory cytokines plays important roles in the response against tissue injury and in host defense. Alterations in the production of inflammatory cytokines may cause local or systemic inflammatory imbalance, culminating in organ failure or lethal systemic inflammation. The cholinergic anti-inflammatory pathway has been implicated as an important mechanism to regulate inflammation of targeted tissue. In this review, we discuss important advances, conflicting and controversial findings regarding the involvement of parasympathetic vagus and sympathetic splenic nerve through acetylcholine (ACh) release and α7 nicotinic acetylcholine receptor (nAChRα7) activation in the spleen. In addition, we address the involvement of cholinergic control of inflammation in other organs innerved by the vagus nerve such as gut, liver, kidney and lung, and independent of parasympathetic innervations such as skin and skeletal muscle. Then, other structures and mechanisms independent of vagus or splenic nerve may be involved in this process, such as local cells and motor neurons producing ACh. Altogether, the convergence of these findings may contribute to current anti-inflammatory strategies involving selective drug-targeting and electrical nerve stimulation. J. Cell. Physiol. 231: 1862-1869, 2016. © 2016 Wiley Periodicals, Inc.

  3. Estimated central blood volume in cirrhosis: relationship to sympathetic nervous activity, beta-adrenergic blockade and atrial natriuretic factor

    DEFF Research Database (Denmark)

    Henriksen, Jens Henrik Sahl; Bendtsen, F; Gerbes, A L

    1992-01-01

    The estimated central blood volume (i.e., blood volume in the heart cavities, lungs and central arterial tree) was determined by multiplying cardiac output by circulatory mean transit time in 19 patients with cirrhosis and compared with sympathetic nervous activity and circulating level of atrial...... natriuretic factor. Arterial norepinephrine level, an index of overall sympathetic nervous activity (3.08 nmol/L in patients vs. 1.36 nmol/L in controls; p blood volume (mean = 23 ml/kg in patients vs. 27 ml/kg in controls; p ....05). Similarly, renal venous norepinephrine level (an index of renal sympathetic tone; 4.26 nmol/L in patients vs. 1.78 nmol/L in controls; p blood volume (r = -0.53, n = 18, p

  4. Adrenal GRK2 upregulation mediates sympathetic overdrive in heart failure.

    Science.gov (United States)

    Lymperopoulos, Anastasios; Rengo, Giuseppe; Funakoshi, Hajime; Eckhart, Andrea D; Koch, Walter J

    2007-03-01

    Cardiac overstimulation by the sympathetic nervous system (SNS) is a salient characteristic of heart failure, reflected by elevated circulating levels of catecholamines. The success of beta-adrenergic receptor (betaAR) antagonists in heart failure argues for SNS hyperactivity being pathogenic; however, sympatholytic agents targeting alpha2AR-mediated catecholamine inhibition have been unsuccessful. By investigating adrenal adrenergic receptor signaling in heart failure models, we found molecular mechanisms to explain the failure of sympatholytic agents and discovered a new strategy to lower SNS activity. During heart failure, there is substantial alpha2AR dysregulation in the adrenal gland, triggered by increased expression and activity of G protein-coupled receptor kinase 2 (GRK2). Adrenal gland-specific GRK2 inhibition reversed alpha2AR dysregulation in heart failure, resulting in lowered plasma catecholamine levels, improved cardiac betaAR signaling and function, and increased sympatholytic efficacy of a alpha2AR agonist. This is the first demonstration, to our knowledge, of a molecular mechanism for SNS hyperactivity in heart failure, and our study identifies adrenal GRK2 activity as a new sympatholytic target.

  5. [Application of the immunohistochemical detection of PGP 9.5 protein for the study of rat and human heart innervation].

    Science.gov (United States)

    Korzhevskiy, D E; Sukhorukova, Ye G; Petrova, Ye S; Tzukanova, A F; Chumasov, Ye I

    2013-01-01

    In this paper we describe the modern immunohistochemical method detecting the neuronal marker PGP 9.5. The application of this method for the study of the innervation of rat and human heart, the detailed examination of the topography of the cardiac nervous apparatus, as well as their changes in pathological states, is demonstrated. Structural organization and the nature of the terminal branches of nerve apparatus suggest that they have afferent function. Protocol of the reaction demonstrating PGP 9.5 on paraffin sections is presented.

  6. "Hybrid" synapses formed by foreign innervation of parasympathetic neurons: a model for selectivity during competitive reinnervation.

    Science.gov (United States)

    Proctor, W; Frenk, S; Taylor, B; Roper, S

    1979-01-01

    Selectivity of synapse formation after nerve regeneration was tested in the parasympathetic cardiac ganglion of frogs (Rana pipiens). First, we tested the ability of somatic motor axons to establish synaptic connections with denervated ganglion cells by implanting the hypoglossus nerve into the vagotomized heart. After several weeks, stimulation of the implanted hypoglossus mediated a parasympathetic-like inhibition of the heart rate, and synaptic responses produced by hypoglossal stimulation were recorded intracellularly in ganglion cells. Light and electron microscopy indicated that implanted hypoglossal nerve terminals contacted parasympathetic ganglion cells only on their axons and not on the cell body (where most vagal synapses are found in control animals). Second, we tested whether regenerating vagal preganglionic axons would complete with foreign (hypoglossal) terminals for innervation of cardiac ganglion cells. We allowed the vagus nerve to regenerate in animals in which the implanted hypoglossus had established functional contacts with the cardiac ganglion. Vagal axons were able to reinnervate the heart and reestablish synaptic connections on the cell bodies of ganglion cells. Furthermore, functional transmission at the foriegn (hypoglossal) terminals disappeared concomitant with vagal reinnervation. Images PMID:315564

  7. [Innervation of the atrioventricular portion of the interatrial septum in the rat].

    Science.gov (United States)

    Pavlovich, E R

    1984-03-01

    A quantitative electron microscopical investigation has revealed reliable differences in contents of muscular, connective tissue and neural elements in the conductive system, on the one hand (in the atrioventricular node and in the internodal specialized pathways) and in the working myocardium of the inferior third of the interatrial septum, on the other hand. Morphometrical analysis of the neuromuscular interrelations, performed separately for every type of specialized conductive myocytes (II, III) and of working cardiomyocytes of the interatrial septum, reveals some differences in size of the neural fibers and their terminals and in distance between them and myocytes. The synaptic vesicles of the efferent terminals are qualitatively different in all types of the myocytes. The afferent terminals situating near specialized cardiac cells are characterized. Criteria for distinguishing small and large granular vesicles in the terminals are discussed. A suggestion is made that the innervational peculiarities revealed reflect certain specificity in regulation the conduction in the atrioventricular area of the heart.

  8. Sensory and sympathetic disorders in chronic non-specific neck pain.

    Science.gov (United States)

    Zaproudina, Nina; Ming, Zhiyong; Närhi, Matti

    2015-01-01

    The signs of sympathetic and sensory nerve-related disorders are not widely investigated in chronic nonspecific neck pain (NNP) patients. Thus, we performed skin temperature (Tsk), evaporation and touch threshold (TT) measurements to reveal possible dysfunctions at the fingertips of NNP patients (n=60) compared with healthy controls (n=11). Neck pain intensity was the main modifier of Tsk, and age the main modifier of TT in a multivariate model. On comparisons of the subgroups of NNP patients with unilateral (n=26) and bilateral (n=34) symptoms and controls, TT differed and Tsk tended to differ, the unilateral pain patients being found to demonstrate higher TT values on both sides. Interrelations between the measured parameters were found in the controls, but not in the patients. The NNP patients exhibited signs of functional impairment of innervation reflected in changes in tactile sensitivity and vasoactive sympathetic function. These changes may be based on both central and peripheral mechanisms, which possibly differ in patients with unilateral and bilateral symptoms.

  9. Effect of regional myocardial ischemia on sympathetic nervous system as assessed by fluorine-18-metaraminol

    Energy Technology Data Exchange (ETDEWEB)

    Schwaiger, M.; Guibourg, H.; Rosenspire, K.; McClanahan, T.; Gallagher, K.; Hutchins, G.; Wieland, D.M. (Univ. of Michigan Medical Center, Ann Arbor (USA))

    1990-08-01

    With the introduction of radiolabeled catecholamine analogues, the noninvasive evaluation of the cardiac sympathetic nervous system has become possible. This study evaluated the effect of regional ischemia on myocardial retention of the new norepinephrine analogue 6-({sup 18}F) fluorometaraminol (FMR) in the open chest dog model. Six dogs were injected intravenously with FMR following 30-min occlusion of the left anterior descending artery. Six sham animals served as control group. Regional myocardial blood flow as determined by microspheres decreased 87% during ischemia (p less than 0.01), but was not significantly different from control myocardium following reperfusion. Regional myocardial 18F activity as determined postmortem was significantly reduced in reperfused myocardium (-34%), which paralleled an 18% reduction of tissue norepinephrine concentration. Thus, short time periods of coronary occlusion affect neuronal function indicating the sensitivity of the sympathetic nerve terminals to ischemia. FMR provides a new tracer approach for the characterization of neuronal integrity in postischemic myocardium.

  10. Regional sympathetic denervation after myocardial infarction: a follow-up study using [123I]MIBG.

    Science.gov (United States)

    Podio, V; Spinnler, M T; Spandonari, T; Moretti, C; Castellano, G; Bessone, M; Brusca, A

    1995-12-01

    Previous studies in dogs have shown that experimental infarction produces myocardial sympathetic denervation not only in the infarcted area, but also in a region apical to the infarction. In these dogs MIBG myocardial scintigraphy detected denervation but returned to normal in a few months at which time reinnervation was shown to have occurred. Myocardial sympathetic denervation was studied with MIBG scintigraphy in ten patients after their first acute transmural myocardial infarction; scans were repeated at 4 months, one year and 30 months to follow the time course of possible reinnervation. Except during the first 48 hours following the infarction, no therapy except for antiaggregants was administered to the patients; during this follow-up period no cardiac events were seen. One week after infarction, comparison of MIBG images with perfusion scans revealed that the denervated area was larger than the infarcted area; no difference in MIBG uptake by the infarcted myocardium was found during the 30 months follow-up.

  11. Central and cerebrovascular effects of leg crossing in humans with sympathetic failure

    DEFF Research Database (Denmark)

    Harms, Mark P M; Wieling, Wouter; Colier, Willy N J M;

    2010-01-01

    MCA Vmean (middle cerebral artery blood velocity; using transcranial Doppler ultrasound), frontal lobe oxygenation [O2Hb (oxyhaemoglobin)] and MAP (mean arterial pressure), CO (cardiac output) and TPR (total peripheral resistance) in six patients (aged 37-67 years; three women) and age- and gender.......12 (0.52-3.27)] in the patients compared with the controls [0.83 (-0.11 to 2.04) micromol/l]. In the control subjects, CO increased 11% (PTPR. By contrast, in the patients, CO increased 9% (PTPR increased by 13% (P... cerebral perfusion and oxygenation both in patients with sympathetic failure and in healthy subjects. However, in healthy subjects, cerebral perfusion and oxygenation were improved by a rise in CO without significant changes in TPR or MAP, whereas in patients with sympathetic failure, cerebral perfusion...

  12. Measurement of functional cholinergic innervation in rat heart with a novel vesamicol receptor ligand

    Energy Technology Data Exchange (ETDEWEB)

    Coffeen, Paul R.; Efange, S.M.N.; Haidet, George C.; McKnite, Scott; Langason, Rosemary B.; Khare, A.B.; Pennington, Jennifer; Lurie, Keith G

    1996-10-01

    Regional differences in cholinergic activity in the cardiac conduction system have been difficult to study. We tested the utility of (+)-m-[{sup 125}I]iodobenzyl)trozamicol(+)-[{sup 125}I]MIBT), a novel radioligand that binds to the vesamicol receptor located on the synaptic vesicle in presynaptic cholinergic neurons, as a functional marker of cholinergic activity in the conduction system. The (+)-[{sup 125}I]MIBT was injected intravenously into four rats. Three hours later, the rats were killed and their hearts were frozen. Quantitative autoradiography was performed on 20-micron-thick sections that were subsequently stained for acetylcholinesterase to identify specific conduction-system elements. Marked similarities existed between (+)-[{sup 125}I]MIBT uptake and acetylcholinesterase-positive regions. Optical densitometric analysis of regional (+)-[{sup 125}I]MIBT uptake revealed significantly greater (+)-[{sup 125}I]MIBT binding (nCi/mg) in the atrioventricular node (AVN) and His bundle regions compared with other conduction and contractile elements (AVN: 3.43 {+-} 0.37; His bundle: 2.16 {+-} 0.30; right bundle branch: 0.95 {+-} 0.13; right atrium: 0.68 {+-} 0.05; right ventricle: 0.57 {+-} 0.03; and left ventricle: 0.57 {+-} 0.03; p < 0.05 comparing conduction elements with ventricular muscle). This study demonstrates that (+)-[{sup 125}I]MIBT binds avidly to cholinergic nerve tissue innervating specific conduction-system elements. Thus, (+)-[{sup 125}I]MIBT may be a useful functional marker in studies on cholinergic innervation in the cardiac conduction system.

  13. Streptozotocin-induced diabetes differentially affects sympathetic innervation and control of plantar metatarsal and mesenteric arteries in the rat.

    Science.gov (United States)

    Johansen, Niloufer J; Tripovic, Diana; Brock, James A

    2013-01-15

    In humans neural control of arterial vessels supplying skin in the extremities is particularly vulnerable to the effects of diabetes. Here the streptozotocin (STZ) rat model of type 1 diabetes was used to compare effects on neurovascular function in plantar metatarsal arteries (PMAs), which supply blood to skin of hind paw digits, with those in mesenteric arteries (MAs). Twelve weeks after STZ (60 mg/kg ip), wire myography was used to assess vascular function. In PMAs, lumen dimensions were unchanged but both nerve-evoked contractions and sensitivity to α(1) (phenylephrine, methoxamine)- and α(2) (clonidine)-adrenoceptor agonists were reduced. The density of perivascular nerve fibers was also reduced by ~25%. These changes were not observed in PMAs from STZ-treated rats receiving either a low dose of insulin that did not greatly reduce blood glucose levels or a high dose of insulin that markedly reduced blood glucose levels. In MAs from STZ-treated rats, nerve-evoked increases in force did not differ from control but, because lumen dimensions were ~20% larger, nerve-evoked increases in effective transmural pressure were smaller. Increases in effective transmural pressure produced by phenylephrine or α,β-methylene ATP in MAs from STZ-treated rats were not smaller than control, but the density of perivascular nerve fibers was reduced by ~10%. In MAs, the increase in vascular dimensions is primarily responsible for reducing effectiveness of nerve-evoked constrictions. By contrast, in PMAs decreases in both the density of perivascular nerve fibers and the reactivity of the vascular muscle appear to explain impairment of neurovascular transmission.

  14. Autonomic innervation of the pancreas in diabetic and non-diabetic rats. A new view on intramural sympathetic structural organization

    NARCIS (Netherlands)

    Luiten, P.G.M.; Horst, G.J. ter; Steffens, A.B.

    1986-01-01

    Using histochemical and immunocytochemical methods the intramural neural tissue of the pancreas was investigated in non-diabetic and in alloxan-diabetic rats. It was demonstrated that the non-diabetic pancreas contains an average of 2.71 cells/mm3 tissue that react positive for activity of acetylcho

  15. Immunomodulation stimulates the innervation of engineered tooth organ.

    Directory of Open Access Journals (Sweden)

    Tunay Kökten

    Full Text Available The sensory innervation of the dental mesenchyme is essential for tooth function and protection. Sensory innervation of the dental pulp is mediated by axons originating from the trigeminal ganglia and is strictly regulated in time. Teeth can develop from cultured re-associations between dissociated dental epithelial and mesenchymal cells from Embryonic Day 14 mouse molars, after implantation under the skin of adult ICR mice. In these conditions however, the innervation of the dental mesenchyme did not occur spontaneously. In order to go further with this question, complementary experimental approaches were designed. Cultured cell re-associations were implanted together with trigeminal ganglia for one or two weeks. Although axonal growth was regularly observed extending from the trigeminal ganglia to all around the forming teeth, the presence of axons in the dental mesenchyme was detected in less than 2.5% of samples after two weeks, demonstrating a specific impairment of their entering the dental mesenchyme. In clinical context, immunosuppressive therapy using cyclosporin A was found to accelerate the innervation of transplanted tissues. Indeed, when cultured cell re-associations and trigeminal ganglia were co-implanted in cyclosporin A-treated ICR mice, nerve fibers were detected in the dental pulp, even reaching odontoblasts after one week. However, cyclosporin A shows multiple effects, including direct ones on nerve growth. To test whether there may be a direct functional relationship between immunomodulation and innervation, cell re-associations and trigeminal ganglia were co-implanted in immunocompromised Nude mice. In these conditions as well, the innervation of the dental mesenchyme was observed already after one week of implantation, but axons reached the odontoblast layer after two weeks only. This study demonstrated that immunodepression per se does stimulate the innervation of the dental mesenchyme.

  16. [Effectiveness of sympathetic block using various technics].

    Science.gov (United States)

    Weissenberg, W

    1987-07-01

    Blocking of sympathetic conduction aims at permanent or temporary elimination of those pain pathways conducted by the sympathetic nervous system. In order to provide an objective evaluation of sufficient blocking effect, earlier inquiries referred to parameters such as: (1) observation of clinical signs such as Horner's syndrome, Guttman's sign, anhidrosis, extended venous filling; (2) difference in skin temperature of at least 1.5 degrees C between blocked and unblocked side; (3) increase in amplitude of the pulse wave; and (4) depression of the psychogalvanic reflex (PGR) on the blocked side (Fig. 1). In clinical practice, these control parameters are effective because they are time-saving, technically simple, and highly evidential. Further parameters for evaluating sympathetic blockade are examination of hydrosis by means of color indicators such as bromocresol and ninhydrin, oscillometry, and plethysmography. The effectiveness of sympathetic blockade after stellate ganglion and sympathetic trunk blocks has been verified by various authors. In a clinical study, 16 patients were divided into four groups in order to test the effectiveness of sympathetic blockade after spinal anesthesia with 3 ml 0.75% bupivacaine (group I) and 4 ml 0.75% bupivacaine (group II) and after peridural anesthesia with 15 ml 0.75% bupivacaine (group III) and 20 ml 0.75% bupivacaine (group IV) by means of temperature difference, response of pulse wave amplitude and PGR between blocked lower and unblocked upper extremity, and sensory levels of block. The patients were classified as ASA I and II; their ages varied from 20 to 63 years.(ABSTRACT TRUNCATED AT 250 WORDS)

  17. Burnout versus work engagement in their effects on 24-hour ambulatory monitored cardiac autonomic function

    NARCIS (Netherlands)

    L.J.P. van Doornen (Lorenz); J.H. Houtveen (Jan); S. Langelaan (Saar); A.B. Bakker (Arnold); W. van Rhenen (Willem); W.B. Schaufeli (Wilmar)

    2009-01-01

    textabstractBurnout has been associated with increased risk of cardiovascular disease. This relationship may be mediated by a stress-related disruption in cardiac autonomic activity. The aim of the present study was to assess cardiac autonomic activity (sympathetic and parasympathetic) during a work

  18. Sympathetic hyperactivity in patients with chronic kidney disease

    NARCIS (Netherlands)

    Neumann, N.

    2007-01-01

    Sympathetic hyperactivity in patients with chronic kidney disease Chronic kidney disease (CKD) is often characterized by the presence of sympathetic hyperactivity. This contributes to the pathogenesis of renal hypertension. It is also associated with cardiovascular (CV) morbidity and mortality indep

  19. SYMPATHETIC SKIN RESPONSE AND GALVANIC SKIN RESISTANCE IN MALES WITH TYPE 2 DIABETES MELLITUS

    Directory of Open Access Journals (Sweden)

    Saravanan Mohanraj

    2016-06-01

    Full Text Available BACKGROUND Diabetes mellitus, a metabolic disorder affects the nervous system due to alteration in various metabolic pathways. As neuropathy manifests in longstanding diabetes mellitus, autonomic nervous system also gets affected. The study was started based on the hypothesis that the sweat glands innervated by autonomic nervous system will be affected in patients with type 2 diabetes mellitus patients with clinical features of neuropathy. This study was undertaken to compare the sympathetic skin response (SSR and galvanic skin resistance (GSR in males with type 2 diabetes mellitus and in controls. METHODS Thirty males in the age group of 45-55 years, known to have diabetes mellitus and having a history of neuropathic symptoms served as subjects and thirty males in the same age group with no history of diabetes mellitus and neuropathy served as controls. SSR and GSR were recorded using Recorders and Medicare Systems 4 channel polygraph in the noise and light reduced research laboratory, Department of Physiology. All the recordings were done between 10-12 noon at ambient temperature. SSR was measured by deep inspiration and the GSR was measured in the supine and standing response. Comparison of latency and amplitude of the sympathetic skin response and the percentage of decrease in galvanic skin resistance was done. RESULT A statistically significant delay in the latency and a reduction in the amplitude of sympathetic skin response was observed in the diabetes patients. There was a lesser percentage of decrease in GSR in the diabetic patients. CONCLUSION This study shows that the SSR and GSR responses are significantly reduced in diabetic individuals and can be used as a diagnostic tool in the detection of diabetic autonomic neuropathy.

  20. The Potential Role of Catheter-Based Renal Sympathetic Denervation in Chronic and End-Stage Kidney Disease.

    Science.gov (United States)

    Sata, Yusuke; Schlaich, Markus P

    2016-07-01

    Sympathetic activation is a hallmark of chronic and end-stage renal disease and adversely affects cardiovascular prognosis. Hypertension is present in the vast majority of these patients and plays a key role in the progressive deterioration of renal function and the high rate of cardiovascular events in this patient cohort. Augmentation of renin release, tubular sodium reabsorption, and renal vascular resistance are direct consequences of efferent renal sympathetic nerve stimulation and the major components of neural regulation of renal function. Renal afferent nerve activity directly influences sympathetic outflow to the kidneys and other highly innervated organs involved in blood pressure control via hypothalamic integration. Renal denervation of the kidney has been shown to reduce blood pressure in many experimental models of hypertension. Targeting the renal nerves directly may therefore be specifically useful in patients with chronic and end-stage renal disease. In this review, we will discuss the potential role of catheter-based renal denervation in patients with impaired kidney function and also reflect on the potential impact on other cardiovascular conditions commonly associated with chronic kidney disease such as heart failure and arrhythmias.

  1. The Role of Lumbar Sympathetic Nerves in Regulation of Blood Flow to Skeletal Muscle during Anaphylactic Hypotension in Anesthetized Rats.

    Directory of Open Access Journals (Sweden)

    Jie Song

    Full Text Available During hypovolemic shock, skeletal muscle blood flow could be redistributed to vital organs via vasoconstriction in part evoked by activation of the innervating sympathetic nerve activity. However, it is not well known whether this mechanism operates during anaphylactic shock. We determined the femoral artery blood flow (FBF and lumbar sympathetic nerve activity (LSNA mainly regulating the hindquater muscle blood flow during anaphylactic hypotension in anesthetized rats. Anesthetized Sprague-Dawley rats were randomly allocated to the following groups (n = 7/group: (1 non-sensitized, (2 anaphylaxis, (3 anaphylaxis-lumbar sympathectomy (LS and (4 anaphylaxis-sinoaortic denervation (SAD groups. Anaphylaxis was induced by an intravenous injection of the ovalbumin antigen to the sensitized rats. The systemic arterial pressure (SAP, heart rate (HR, central venous pressure (CVP, FBF and LSNA were continuously measured. In the anaphylaxis group, LSNA and HR increased, while SAP and FBF decreased after antigen injection. In the anaphylaxis-SAD group, LSNA did not significantly change during the early phase, but the responses of SAP and FBF were similar to those in the anaphylaxis group. In the anaphylaxis-LS group, both FBF and SAP decreased similarly to the anaphylaxis group during anaphylactic hypotension. These results indicated that LSNA increased via baroreceptor reflex, but this sympathoexcitation or LS did not affect antigen-induced decreases in FBF or SAP. Lumbar sympathetic nerves are not involved in regulation of the blood flow to the hindlimb or systemic blood pressure during anaphylactic hypotension in anesthetized rats.

  2. Developmental androgen excess programs sympathetic tone and adipose tissue dysfunction and predisposes to a cardiometabolic syndrome in female mice.

    Science.gov (United States)

    Nohara, Kazunari; Waraich, Rizwana S; Liu, Suhuan; Ferron, Mathieu; Waget, Aurélie; Meyers, Matthew S; Karsenty, Gérard; Burcelin, Rémy; Mauvais-Jarvis, Franck

    2013-06-15

    Among women, the polycystic ovarian syndrome (PCOS) is considered a form of metabolic syndrome with reproductive abnormalities. Women with PCOS show increased sympathetic tone, visceral adiposity with enlarged adipocytes, hypoadiponectinemia, insulin resistance, glucose intolerance, increased inactive osteocalcin, and hypertension. Excess fetal exposure to androgens has been hypothesized to play a role in the pathogenesis of PCOS. Previously, we showed that neonatal exposure to the androgen testosterone (NT) programs leptin resistance in adult female mice. Here, we studied the impact of NT on lean and adipose tissues, sympathetic tone in cardiometabolic tissues, and the development of metabolic dysfunction in mice. Neonatally androgenized adult female mice (NTF) displayed masculinization of lean tissues with increased cardiac and skeletal muscle as well as kidney masses. NTF mice showed increased and dysfunctional white adipose tissue with increased sympathetic tone in both visceral and subcutaneous fat as well as increased number of enlarged and insulin-resistant adipocytes that displayed altered expression of developmental genes and hypoadiponectinemia. NTF exhibited dysfunctional brown adipose tissue with increased mass and decreased energy expenditure. They also displayed decreased undercarboxylated and active osteocalcin and were predisposed to obesity during chronic androgen excess. NTF showed increased renal sympathetic tone associated with increased blood pressure, and they developed glucose intolerance and insulin resistance. Thus, developmental exposure to testosterone in female mice programs features of cardiometabolic dysfunction, as can be observed in women with PCOS, including increased sympathetic tone, visceral adiposity, insulin resistance, prediabetes, and hypertension.

  3. Sympathetic reflex control of blood flow in human peripheral tissues

    DEFF Research Database (Denmark)

    Henriksen, O

    1991-01-01

    Sympathetic vasoconstrictor reflexes are essential for the maintenance of arterial blood pressure in upright position. It has been generally believed that supraspinal sympathetic vasoconstrictor reflexes elicited by changes in baroreceptor activity play an important role. Recent studies on human ...... to collision of normodromically and antidromically conducted impulses in efferent sympathetic vasoconstrictor fibers. The evidence obtained suggests that sympathetic vasoconstrictor reflexes to postural changes are complex and highly differentiated....

  4. Part and Parcel of the Cardiac Autonomic Nerve System: Unravelling Its Cellular Building Blocks during Development

    Directory of Open Access Journals (Sweden)

    Anna M. D. Végh

    2016-09-01

    Full Text Available The autonomic nervous system (cANS is essential for proper heart function, and complications such as heart failure, arrhythmias and even sudden cardiac death are associated with an altered cANS function. A changed innervation state may underlie (part of the atrial and ventricular arrhythmias observed after myocardial infarction. In other cardiac diseases, such as congenital heart disease, autonomic dysfunction may be related to disease outcome. This is also the case after heart transplantation, when the heart is denervated. Interest in the origin of the autonomic nerve system has renewed since the role of autonomic function in disease progression was recognized, and some plasticity in autonomic regeneration is evident. As with many pathological processes, autonomic dysfunction based on pathological innervation may be a partial recapitulation of the early development of innervation. As such, insight into the development of cardiac innervation and an understanding of the cellular background contributing to cardiac innervation during different phases of development is required. This review describes the development of the cANS and focuses on the cellular contributions, either directly by delivering cells or indirectly by secretion of necessary factors or cell-derivatives.

  5. Periodic Repolarisation Dynamics: A Natural Probe of the Ventricular Response to Sympathetic Activation

    Science.gov (United States)

    Rizas, Konstantinos D; Hamm, Wolfgang; Kääb, Stefan; Schmidt, Georg; Bauer, Axel

    2016-01-01

    Periodic repolarisation dynamics (PRD) refers to low-frequency (≤0.1Hz) modulations of cardiac repolarisation instability. Spontaneous PRD can be assessed non-invasively from 3D high-resolution resting ECGs. Physiological and experimental studies have indicated that PRD correlates with efferent sympathetic nerve activity, which clusters in low-frequency bursts. PRD is increased by physiological provocations that lead to an enhancement of sympathetic activity, whereas it is suppressed by pharmacological β-blockade. Electrophysiological studies revealed that PRD occurs independently from heart rate variability. Increased PRD under resting conditions is a strong predictor of mortality in post-myocardial infarction (post-MI) patients, yielding independent prognostic value from left-ventricular ejection fraction (LVEF), heart rate variability, the Global Registry of Acute Coronary Events score and other established risk markers. The predictive value of PRD is particularly strong in post-MI patients with preserved LVEF (>35 %) in whom it identifies a new high-risk group of patients. The upcoming Implantable Cardiac Monitors in High-Risk Post-Infarction Patients with Cardiac Autonomic Dysfunction and Moderately Reduced Left Ventricular Ejection Fraction (SMART-MI) trial will test prophylactic strategies in high-risk post-MI patients with LVEF 36–50 % identified by PRD and deceleration capacity of heart rate (NCT02594488). PMID:27403291

  6. Trapping and Sympathetic Cooling of Boron Ions

    CERN Document Server

    Rugango, Rene; Shu, Gang; Brown, Kenneth R

    2016-01-01

    We demonstrate the trapping and sympathetic cooling of B$^{+}$ ions in a Coulomb crystal of laser-cooled Ca$^{+}$, We non-destructively confirm the presence of the both B$^+$ isotopes by resonant excitation of the secular motion. The B$^{+}$ ions are loaded by ablation of boron and the secular excitation spectrum also reveals features consistent with ions of the form B$_{n}^{+}$.

  7. Pigmentation associated histopathological variations in sympathetic ophthalmia.

    Science.gov (United States)

    Marak, G E; Ikui, H

    1980-01-01

    The severity of inflammation in sympathetic ophthalmia is related to the degree of pigmentation, and the granulomatous response seems to be related to pigmentation. Eosinophilia is also associated with pigmentation, but this association appears to be fortuitous and is a result of the association of eosinophilia with severity of the inflammation. PMID:7387955

  8. Function and innervation of the involuntary m. retroauricularis.

    Science.gov (United States)

    Heuser, M

    1976-10-01

    Beside the automatic, obligatory and tonic coinnervation of the involuntary m. retroauricularis in conjugate lateral gaze (oculoauricular phenomenon, nystagmus) several other physiological ways of accidental coinnervation are described. In talking, chewing, swallowing and during involuntary inspiration irregular bursts of innervation may be registered. In sleep regular rhythmic inspiratory innervation is demonstrated as well as myoclonic jerks. With reservation, an allusion is made to rem-sleep. In "nervous subjects" irregular involuntary innervation of the m. retroauricularis might serve as a measurement instrument for the involuntary somatomotor nervous system, i.e. the degree of neurotic tensity. An early myasthenic reaction is gained from the M. retroauricularis in patients with ocular forms of the disease. A common motor nucleus of abducens and facial nerve is discussed. Complementary studies are announced on the various forms of facial paralysis, strabismus and nystagmus. A further diagnostic use is presumed.

  9. The Lesser Palatine Nerve Innervates the Levator Veli Palatini Muscle

    Science.gov (United States)

    Matsuura, Yoshitaka; Kawai, Katsuya; Yamada, Shigehito; Suzuki, Shigehiko

    2016-01-01

    Summary: When the lesser palatine nerve (LPN) is supposed to be a branch of the trigeminal nerve and innervate sensation of the soft palate, whether the LPN contains motor fibers is unclear. In this study, we monitored the electromyogram of the levator veli palatini (LVP) muscle on stimulating the LPN during palatoplasty in 3 patients. The electromyogram of the muscles showed the myogenic potential induced by electrostimulation of the LPN. Taken together with the finding from our previous anatomical study that the motor fibers come from the facial nerve, this result supports the double innervation theory of the LVP, which posits that both the pharyngeal plexus and the facial nerve innervate it. Identifying and preserving the LPN during palatoplasty might improve postoperative speech results. PMID:27757354

  10. Clinical application of l-123 MlBG cardiac imaging

    Energy Technology Data Exchange (ETDEWEB)

    Kang, Do Young [College of Medicine, Donga Univ., Busan (Korea, Republic of)

    2004-10-01

    Cardiac neurotransmission imaging allows in vivo assessment of presynaptic reuptake, neurotransmitter storage and postsynaptic receptors. Among the various neurotransmitter, I-123 MlBG is most available and relatively well-established. Metaiodobenzylguanidine (MIBG) is an analogue of the false neurotransmitter guanethidine. It is taken up to adrenergic neurons by uptake-1 mechanism as same as norepinephrine. As tagged with I-123, it can be used to image sympathetic function in various organs including heart with planar or SPECT techniques. I-123 MIBG imaging has a unique advantage to evaluate myocardial neuronal activity in which the heart has no significant structural abnormality or even no functional derangement measured with other conventional examination. In patients with cardiomyopathy and heart failure, this imaging has most sensitive technique to predict prognosis and treatment response of betablocker or ACE inhibitor. In diabetic patients, it allow very early detection of autonomic neuropathy. In patients with dangerous arrhythmia such as ventricular tachycardia or fibrillation, MIBG imaging may be only an abnormal result among various exams. In patients with ischemic heart disease, sympathetic derangement may be used as the method of risk stratification. In heart transplanted patients, sympathetic reinnervation is well evaluated. Adriamycin-induced cardiotoxicity is detected earlier than ventricular dysfunction with sympathetic dysfunction. Neurodegenerative disorder such as Parkinson's disease or dementia with Lewy bodies has also cardiac sympathetic dysfunction. Noninvasive assessment of cardiac sympathetic nerve activity with l-123 MlBG imaging may be improve understanding of the pathophysiology of cardiac disease and make a contribution to predict survival and therapy efficacy.

  11. Sympathetic reflex control of blood flow in human peripheral tissues

    DEFF Research Database (Denmark)

    Henriksen, O

    1991-01-01

    Sympathetic vasoconstrictor reflexes are essential for the maintenance of arterial blood pressure in upright position. It has been generally believed that supraspinal sympathetic vasoconstrictor reflexes elicited by changes in baroreceptor activity play an important role. Recent studies on human...... sympathetic vasoconstrictor reflexes are blocked. Blood flow has been measure by the local 133Xe-technique. The results indicate the presence of spinal as well as supraspinal sympathetic vasoconstrictor reflexes to human peripheral tissues. Especially is emphasized the presence of a local sympathetic veno...

  12. Cardiac autonomic nerve distribution and arrhythmia

    Institute of Scientific and Technical Information of China (English)

    Quan Liu; Dongmei Chen; Yonggang Wang; Xin Zhao; Yang Zheng

    2012-01-01

    OBJECTIVE: To analyze the distribution characteristics of cardiac autonomic nerves and to explore the correlation between cardiac autonomic nerve distribution and arrhythmia.DATA RETRIEVAL: A computer-based retrieval was performed for papers examining the distribution of cardiac autonomic nerves, using "heart, autonomic nerve, sympathetic nerve, vagus nerve, nerve distribution, rhythm and atrial fibrillation" as the key words.SELECTION CRITERIA: A total of 165 studies examining the distribution of cardiac autonomic nerve were screened, and 46 of them were eventually included.MAIN OUTCOME MEASURES: The distribution and characteristics of cardiac autonomic nerves were observed, and immunohistochemical staining was applied to determine the levels of tyrosine hydroxylase and acetylcholine transferase (main markers of cardiac autonomic nerve distribution). In addition, the correlation between cardiac autonomic nerve distribution and cardiac arrhythmia was investigated.RESULTS: Cardiac autonomic nerves were reported to exhibit a disordered distribution in different sites, mainly at the surface of the cardiac atrium and pulmonary vein, forming a ganglia plexus. The distribution of the pulmonary vein autonomic nerve was prominent at the proximal end rather than the distal end, at the upper left rather than the lower right, at the epicardial membrane rather than the endocardial membrane, at the left atrium rather than the right atrium, and at the posterior wall rather than the anterior wall. The main markers used for cardiac autonomic nerves were tyrosine hydroxylase and acetylcholine transferase. Protein gene product 9.5 was used to label the immunoreactive nerve distribution, and the distribution density of autonomic nerves was determined using a computer-aided morphometric analysis system.CONCLUSION: The uneven distribution of the cardiac autonomic nerves is the leading cause of the occurrence of arrhythmia, and the cardiac autonomic nerves play an important role in the

  13. Renal denervation for treatment of cardiac arrhythmias: state of the art and future directions.

    Science.gov (United States)

    Kosiuk, Jedrzej; Hilbert, Sebastian; Pokushalov, Evgeny; Hindricks, Gerhard; Steinberg, Jonathan S; Bollmann, Andreas

    2015-02-01

    It has now been more than a quarter of a century since modulation of the sympathetic nervous system was proposed for the treatment of cardiac arrhythmias of different origins. But it has also been some time since some of the early surgical attempts have been abandoned. With the development of ablation techniques, however, new approaches and targets have been recently introduced that have revolutionized our way of thinking about sympathetic modulation. Renal nerve ablation technology is now being successfully used for the treatment of resistant hypertension, but the indication spectrum might broaden and new therapeutic options might arise in the near future. This review focuses on the possible impact of renal sympathetic system modulation on cardiac arrhythmias, the current evidence supporting this approach, and the ongoing trials of this method in electrophysiological laboratories. We will discuss the potential roles that sympathetic modulation may play in the future.

  14. Cardiac arrest

    Science.gov (United States)

    ... Article.jsp. Accessed June 16, 2014. Myerburg RJ, Castellanos A. Approach to cardiac arrest and life-threatening ... PA: Elsevier Saunders; 2011:chap 63. Myerburg RJ, Castellanos A. Cardiac arrest and audden aardiac death. In: ...

  15. Research progress of myocardial ischemia and sympathetic afferent%心肌缺血与交感神经传入的研究进展

    Institute of Scientific and Technical Information of China (English)

    刘俊; 梁尚栋

    2011-01-01

    心脏的自主神经包括交感神经与副交感神经.支配心脏的交感神经不仅有传出轴突,也有传递心脏感受的传入神经.心肌缺血可激活心交感传入神经并将信息传递到大脑心血管中枢,通过兴奋交感传出神经引起交感兴奋性反射,出现心率加快和血压升高等现象使心肌缺血、缺氧和心绞痛加重.因此,交感神经功能变化可加重心肌缺血损伤.%The heart autonomic nervous system consists of both sympathetic and parasympathetic nerves. The heart sympathetic nerves contain not only efferent axons, but also the afferentnerve( transmitting messages to the heart ). Myocardial ischemia activates cardiac sympathetic afferent nerve and transmits the information to the brain and cardiovascular centre, which resultsin sympathetic reflex excitability by excitatory sympathetic efferent. This causes an increase in heart rate and blood pressure, leading to the development of myocardial ischemia, hypoxia and angina pain. Therefore, the change in sympathetic function is acontributing factor to myocardial ischemia.

  16. Polyneural innervation in the psoas muscle of the developing rat

    NARCIS (Netherlands)

    Ijkema-Paassen, J; Gramsbergen, A

    1998-01-01

    Polyneural innervation was studied in the psoas muscle in developing rats from P4 till P25 and at adult age, with the combined silver-acetylcholinesterase technique. Nerve endings were counted, and endplates were measured. These data were compared with such data in the human. The end of polyneural i

  17. Sensory innervation of the thoracolumbar fascia in rats and humans.

    Science.gov (United States)

    Tesarz, J; Hoheisel, U; Wiedenhöfer, B; Mense, S

    2011-10-27

    The available data on the innervation of the thoracolumbar fascia (TLF) are inconsistent and partly contradictory. Therefore, the role of the fascia as a potential source of pain in the low back is difficult to assess. In the present study, a quantitative evaluation of calcitonin gene-related peptide (CGRP) and substance P (SP)-containing free nerve endings was performed in the rat TLF. A preliminary non-quantitative evaluation was also performed in specimens of the human TLF. The data show that the TLF is a densely innervated tissue with marked differences in the distribution of the nerve endings over the fascial layers. In the rat, we distinguished three layers: (1) Outer layer (transversely oriented collagen fibers adjacent to the subcutaneous tissue), (2) middle layer (massive collagen fiber bundles oriented obliquely to the animal's long axis), and (3) inner layer (loose connective tissue covering the paraspinal muscles). The subcutaneous tissue and the outer layer showed a particularly dense innervation with sensory fibers. SP-positive free nerve endings-which are assumed to be nociceptive-were exclusively found in these layers. Because of its dense sensory innervation, including presumably nociceptive fibers, the TLF may play an important role in low back pain.

  18. Innervation of the hard palate of the rat

    NARCIS (Netherlands)

    Liem, Swie Bing

    1989-01-01

    This study is undertaken to gain more insight into the pattern of innervation of the hard palate of the rat and into the morphology of the sensory structures found there. Since the main research project of the Department of Neurobiology and Oral Physiology is dedicated to the formulation of a model

  19. Effect of percutaneous renal sympathetic nerve radiofrequency ablation in patients with severe heart failure.

    Science.gov (United States)

    Dai, Qiming; Lu, Jing; Wang, Benwen; Ma, Genshan

    2015-01-01

    This study aimed to investigate the clinical feasibility and effects of percutaneous renal sympathetic nerve radiofrequency ablation in patients with heart failure. A total of 20 patients with heart failure were enrolled, aged from 47 to 75 years (63±10 years). They were divided into the standard therapy (n = 10), and renal nerve radiofrequency ablation groups (n = 10). There were 15 males and 5 female patients, including 8 ischemic cardiomyopathy, 8 dilated cardiomyopathy, and 8 hypertensive cardiopathy. All of the patients met the criteria of New York Heart Association classes III-IV cardiac function. Patients with diabetes and renal failure were excluded. Percutaneous renal sympathetic nerve radiofrequency ablation was performed on the renal artery wall under X-ray guidance. Serum electrolytes, neurohormones, and 24 h urine volume were recorded 24 h before and after the operation. Echocardiograms were performed to obtain left ventricular ejection fraction at baseline and 6 months. Heart rate, blood pressure, symptoms of dyspnea and edema were also monitored. After renal nerve ablation, 24 h urine volume was increased, while neurohormone levels were decreased compared with those of pre-operation and standard therapy. No obvious change in heart rate or blood pressure was recorded. Symptoms of heart failure were improved in patients after the operation. No complications were recorded in the study. Percutaneous renal sympathetic nerve radiofrequency ablation may be a feasible, safe, and effective treatment for the patients with severe congestive heart failure.

  20. Should the sympathetic nervous system be a target to improve cardiometabolic risk in obesity?

    Science.gov (United States)

    Lambert, Elisabeth A; Straznicky, Nora E; Dixon, John B; Lambert, Gavin W

    2015-07-15

    The sympathetic nervous system (SNS) plays a key role in both cardiovascular and metabolic regulation; hence, disturbances in SNS regulation are likely to impact on both cardiovascular and metabolic health. With excess adiposity, in particular when visceral fat accumulation is present, sympathetic activation commonly occurs. Experimental investigations have shown that adipose tissue releases a large number of adipokines, cytokines, and bioactive mediators capable of stimulating the SNS. Activation of the SNS and its interaction with adipose tissue may lead to the development of hypertension and end-organ damage including vascular, cardiac, and renal impairment and in addition lead to metabolic abnormalities, especially insulin resistance. Lifestyle changes such as weight loss and exercise programs considerably improve the cardiovascular and metabolic profile of subjects with obesity and decrease their cardiovascular risk, but unfortunately weight loss is often difficult to achieve and sustain. Pharmacological and device-based approaches to directly or indirectly target the activation of the SNS may offer some benefit in reducing the cardiometabolic consequences of obesity. Preliminary evidence is encouraging, but more trials are needed to investigate whether sympathetic inhibition could be used in obesity to reverse or prevent cardiometabolic disease development. The purpose of this review article is to highlight the current knowledge of the role that SNS plays in obesity and its associated metabolic disorders and to review the potential benefits of sympathoinhibition on metabolic and cardiovascular functions.

  1. [The epiglottis, a glosso-laryngeal structure: an anatomic study of its innervation].

    Science.gov (United States)

    Touré, G; Vacher, C

    2005-09-01

    The epiglottis is known as a laryngeal structure. The authors studied the innervation of epiglottis using the Sihler method on six human epiglottises. Innervation of the epiglottis depended on the rami from the vagus, glossopharyngeal and hypoglossal nerves. By its innervation, epiglottis seems to be a glosso-laryngeal structure, as is confirmed by embryology, histology and clinical applications.

  2. Longitudinal Evaluation of Sympathetic Nervous System and Perfusion in Normal and Spontaneously Hypertensive Rat Hearts with Dynamic Single-Photon Emission Computed Tomography

    Directory of Open Access Journals (Sweden)

    Yunlong Zan

    2015-07-01

    Full Text Available The objective of this work was to evaluate the sympathetic nervous system and structure remodeling during the progression of heart failure in a rodent model using dynamic cardiac single-photon emission computed tomography (SPECT. The spontaneously hypertensive rat (SHR model was used to study changes in the nervous system innervation and perfusion in the left ventricular (LV myocardium with the progression of left ventricular hypertrophy (LVH to heart failure. Longitudinal dynamic SPECT studies were performed with seven SHR and seven Wistar-Kyoto (WKY rats over 1.5 years using a dual-head SPECT scanner with pinhole collimators. Time-activity curves (TACs of the 123I-MIBG and 201Tl distribution in the LV blood pool and myocardium were extracted from dynamic SPECT data and fitted to compartment models to determine the influx rate, washout rate, and distribution volume (DV of 123I-MIBG and 201Tl in the LV myocardium. The standardized uptake values (SUVs of 123I-MIBG and 201Tl in the LV myocardium were also calculated from the static reconstructed images. The influx and washout rates of 123I-MIBG did not show a significant difference between SHRs and WKY rats. The DVs of 123I-MIBG were greater in the SHRs than in the WKY rats (p = .0028. Specifically, the DV of 123I-MIBG became greater in the SHRs by 6 months of age (p = .0017 and was still significant at the age of 22 months. The SUV of 123I-MIBG in SHRs exhibited abnormal values compared to WKY rats from the age of 18 months. There was no difference in the influx rate and the washout rate of 201Tl between the SHRs and WKY rats. The SHRs exhibited greater DV of 201Tl than WKY rats after the age of 18 months (p = .034. The SUV of 201Tl in SHRs did not show any significant difference from WKY at all ages. The higher DV of 123I-MIBG in the LV myocardium reveals abnormal nervous system activity of the SHRs at an age of 6 months, whereas a greater DV of 201Tl in the LV myocardium can only be detected at

  3. Sympathetic adaptations to one-legged training

    Science.gov (United States)

    Ray, C. A.

    1999-01-01

    The purpose of the present study was to determine the effect of leg exercise training on sympathetic nerve responses at rest and during dynamic exercise. Six men were trained by using high-intensity interval and prolonged continuous one-legged cycling 4 day/wk, 40 min/day, for 6 wk. Heart rate, mean arterial pressure (MAP), and muscle sympathetic nerve activity (MSNA; peroneal nerve) were measured during 3 min of upright dynamic one-legged knee extensions at 40 W before and after training. After training, peak oxygen uptake in the trained leg increased 19 +/- 2% (P leg exercise and indicates that attenuation of MSNA to exercise reported with forearm training also occurs with leg training.

  4. [Sympathetically maintained pain (SMP): phentolamine test vs sympathetic nerve blockade. Comparison of two diagnostic methods].

    Science.gov (United States)

    Wehnert, Y; Müller, B; Larsen, B; Kohn, D

    2002-11-01

    The objective of our study was to clarify whether the phentolamine test is as suitable as sympathetic blockade in diagnosing cases of sympathetically maintained pain. The specificity and the sensitivity of both procedures were examined within a prospective and randomized study. Both a local sympathetic blockade and an intravenous phentolamine infusion were carried out in 29 patients with persistent pain in the area of the upper or lower extremities. A significant improvement was defined as reduction of pain of at least 50%. There were no complications in either test procedure. The phentolamine test registers sympathetically maintained pain well when it has a positive result (specificity of 83%). However, the phentolamine test shows only a low sensitivity of 69%. The phentolamine test, on the other hand, can be realized very easily and safely. Therefore, based on the results obtained, it is recommended that the phentolamine test be applied for primary diagnosis. In case of a negative result, further diagnosis should follow subsequently, for example with local sympathetic blockade.

  5. Swimming training increases cardiac vagal activity and induces cardiac hypertrophy in rats

    Directory of Open Access Journals (Sweden)

    A. Medeiros

    2004-12-01

    Full Text Available The effect of swimming training (ST on vagal and sympathetic cardiac effects was investigated in sedentary (S, N = 12 and trained (T, N = 12 male Wistar rats (200-220 g. ST consisted of 60-min swimming sessions 5 days/week for 8 weeks, with a 5% body weight load attached to the tail. The effect of the autonomic nervous system in generating training-induced resting bradycardia (RB was examined indirectly after cardiac muscarinic and adrenergic receptor blockade. Cardiac hypertrophy was evaluated by cardiac weight and myocyte morphometry. Plasma catecholamine concentrations and citrate synthase activity in soleus muscle were also determined in both groups. Resting heart rate was significantly reduced in T rats (355 ± 16 vs 330 ± 20 bpm. RB was associated with a significantly increased cardiac vagal effect in T rats (103 ± 25 vs 158 ± 40 bpm, since the sympathetic cardiac effect and intrinsic heart rate were similar for the two groups. Likewise, no significant difference was observed for plasma catecholamine concentrations between S and T rats. In T rats, left ventricle weight (13% and myocyte dimension (21% were significantly increased, suggesting cardiac hypertrophy. Skeletal muscle citrate synthase activity was significantly increased by 52% in T rats, indicating endurance conditioning. These data suggest that RB induced by ST is mainly mediated parasympathetically and differs from other training modes, like running, that seems to mainly decrease intrinsic heart rate in rats. The increased cardiac vagal activity associated with ST is of clinical relevance, since both are related to increased life expectancy and prevention of cardiac events.

  6. A vesicular sequestration to oxidative deamination shift in myocardial sympathetic nerves in Parkinson's disease.

    Science.gov (United States)

    Goldstein, David S; Sullivan, Patricia; Holmes, Courtney; Miller, Gary W; Sharabi, Yehonatan; Kopin, Irwin J

    2014-10-01

    In Parkinson's disease (PD), profound putamen dopamine (DA) depletion reflects denervation and a shift from vesicular sequestration to oxidative deamination of cytoplasmic DA in residual terminals. PD also involves cardiac sympathetic denervation. Whether PD entails myocardial norepinephrine (NE) depletion and a sequestration-deamination shift have been unknown. We measured apical myocardial tissue concentrations of NE, DA, and their neuronal metabolites 3,4-dihydroxyphenylglycol (DHPG), and 3,4-dihydroxyphenylacetic acid (DOPAC) from 23 PD patients and 23 controls and ascertained the extent of myocardial NE depletion in PD. We devised, validated in VMAT2-Lo mice, and applied 5 neurochemical indices of the sequestration-deamination shift-concentration ratios of DOPAC:DA, DA:NE, DHPG:NE, DOPAC:NE, and DHPG:DOPAC-and used a kinetic model to estimate the extent of the vesicular storage defect. The PD group had decreased myocardial NE content (p Parkinson's disease (PD) patients have profound (98%) myocardial norepinephrine depletion, because of both cardiac sympathetic denervation and a shift from vesicular sequestration to oxidative deamination of cytoplasmic catecholamines in the residual nerves. This shift may be part of a final common pathogenetic pathway in the loss of catecholaminergic neurons that characterizes PD.

  7. Increased sympathetic tone in forearm subcutaneous tissue in primary hypothyroidism

    DEFF Research Database (Denmark)

    Vagn Nielsen, H; Hasselström, K; Feldt-Rasmussen, U

    1987-01-01

    Sympathetic reflex regulation of subcutaneous blood flow (SBF) in the forearm was studied in eight patients with primary hypothyroidism. Diastolic arterial pressure was greater than or equal to 95 mmHg in five patients. SBF was determined by local clearance of Na99mTcO4. Sympathetic vasoconstrict......Sympathetic reflex regulation of subcutaneous blood flow (SBF) in the forearm was studied in eight patients with primary hypothyroidism. Diastolic arterial pressure was greater than or equal to 95 mmHg in five patients. SBF was determined by local clearance of Na99mTcO4. Sympathetic.......02)). In conclusion sympathetic vasoconstrictor activity in adipose tissue is markedly increased in primary hypothyroidism. Sympathetic tone and arterial pressure are reduced during treatment....

  8. The sympathetic nervous system alterations in human hypertension.

    Science.gov (United States)

    Grassi, Guido; Mark, Allyn; Esler, Murray

    2015-03-13

    Several articles have dealt with the importance and mechanisms of the sympathetic nervous system alterations in experimental animal models of hypertension. This review addresses the role of the sympathetic nervous system in the pathophysiology and therapy of human hypertension. We first discuss the strengths and limitations of various techniques for assessing the sympathetic nervous system in humans, with a focus on heart rate, plasma norepinephrine, microneurographic recording of sympathetic nerve traffic, and measurements of radiolabeled norepinephrine spillover. We then examine the evidence supporting the importance of neuroadrenergic factors as promoters and amplifiers of human hypertension. We expand on the role of the sympathetic nervous system in 2 increasingly common forms of secondary hypertension, namely hypertension associated with obesity and with renal disease. With this background, we examine interventions of sympathetic deactivation as a mode of antihypertensive treatment. Particular emphasis is given to the background and results of recent therapeutic approaches based on carotid baroreceptor stimulation and radiofrequency ablation of the renal nerves.

  9. Differential effects of adrenergic antagonists (Carvedilol vs Metoprolol on parasympathetic and sympathetic activity: a comparison of clinical results

    Directory of Open Access Journals (Sweden)

    Heather L. Bloom

    2014-08-01

    Full Text Available Background Cardiovascular autonomic neuropathy (CAN is recognized as a significant health risk, correlating with risk of heart disease, silent myocardial ischemia or sudden cardiac death. Beta-blockers are often prescribed to minimize risk. Objectives In this second of two articles, the effects on parasympathetic and sympathetic activity of the alpha/beta-adrenergic blocker, Carvedilol, are compared with those of the selective beta-adrenergic blocker, Metoprolol. Methods Retrospective, serial autonomic nervous system test data from 147 type 2 diabetes mellitus patients from eight ambulatory clinics were analyzed. Patients were grouped according to whether a beta-blocker was (1 introduced, (2 discontinued or (3 continued without adjustment. Group 3 served as the control. Results Introducing Carvedilol or Metoprolol decreased heart rate and blood pressure, and discontinuing them had the opposite effect. Parasympathetic activity increased with introducing Carvedilol. Sympathetic activity increased more after discontinuing Carvedilol, suggesting better sympathetic suppression. With ongoing treatment, resting parasympathetic activity decreased with Metoprolol but increased with Carvedilol. Conclusion Carvedilol has a more profound effect on sympathovagal balance than Metoprolol. While both suppress sympathetic activity, only Carvedilol increases parasympathetic activity. Increased parasympathetic activity may underlie the lower mortality risk with Carvedilol.

  10. Heart rate complexity: A novel approach to assessing cardiac stress reactivity.

    Science.gov (United States)

    Brindle, Ryan C; Ginty, Annie T; Phillips, Anna C; Fisher, James P; McIntyre, David; Carroll, Douglas

    2016-04-01

    Correlation dimension (D2), a measure of heart rate (HR) complexity, has been shown to decrease in response to acute mental stress and relate to adverse cardiovascular health. However, the relationship between stress-induced changes in D2 and HR has yet to be established. The present studies aimed to assess this relationship systematically while controlling for changes in respiration and autonomic activity. In Study 1 (N = 25) D2 decreased during stress and predicted HR reactivity even after adjusting for changes in respiration rate, and cardiac vagal tone. This result was replicated in Study 2 (N = 162) and extended by including a measure of cardiac sympathetic activity; correlation dimension remained an independent predictor of HR reactivity in a hierarchical linear model containing measures of cardiac parasympathetic and sympathetic activity and their interaction. These results suggest that correlation dimension may provide additional information regarding cardiac stress reactivity above that provided by traditional measures of cardiac autonomic function.

  11. Carotid baroreceptor-muscle sympathetic relation in humans.

    Science.gov (United States)

    Rea, R F; Eckberg, D L

    1987-12-01

    The purpose of this study was to define the relation between carotid distending pressure and muscle sympathetic activity in humans. Carotid baroreceptors of nine healthy subjects were compressed or stretched for 5 s with graded neck pressure or suction (+40 to -65 mmHg), and muscle sympathetic nerve activity was recorded. The results delineate several features of human baroreflex function. First, the carotid-muscle sympathetic relation is well described by an inverse sigmoid function. Second, a linear relation exists between carotid distending pressure and sympathetic outflow over a range of approximately 25 mmHg. Third, sympathetic responses to changes of carotid pressures are asymmetric; increases of sympathetic activity during carotid compression are much greater than reductions of sympathetic activity during carotid stretch. Fourth, at rest, normal subjects operate near the threshold level for sympathetic excitation. Thus the carotid-muscle sympathetic baroreflex is poised to oppose reductions more effectively than elevations of arterial pressure, and the range of pressures over which the reflex is active is wider than thought hitherto.

  12. Abnormal Cardiac Autonomic Regulation in Mice Lacking ASIC3

    Directory of Open Access Journals (Sweden)

    Ching-Feng Cheng

    2014-01-01

    Full Text Available Integration of sympathetic and parasympathetic outflow is essential in maintaining normal cardiac autonomic function. Recent studies demonstrate that acid-sensing ion channel 3 (ASIC3 is a sensitive acid sensor for cardiac ischemia and prolonged mild acidification can open ASIC3 and evoke a sustained inward current that fires action potentials in cardiac sensory neurons. However, the physiological role of ASIC3 in cardiac autonomic regulation is not known. In this study, we elucidate the role of ASIC3 in cardiac autonomic function using Asic3−/− mice. Asic3−/− mice showed normal baseline heart rate and lower blood pressure as compared with their wild-type littermates. Heart rate variability analyses revealed imbalanced autonomic regulation, with decreased sympathetic function. Furthermore, Asic3−/− mice demonstrated a blunted response to isoproterenol-induced cardiac tachycardia and prolonged duration to recover to baseline heart rate. Moreover, quantitative RT-PCR analysis of gene expression in sensory ganglia and heart revealed that no gene compensation for muscarinic acetylcholines receptors and beta-adrenalin receptors were found in Asic3−/− mice. In summary, we unraveled an important role of ASIC3 in regulating cardiac autonomic function, whereby loss of ASIC3 alters the normal physiological response to ischemic stimuli, which reveals new implications for therapy in autonomic nervous system-related cardiovascular diseases.

  13. Cardiac neuronal imaging with {sup 123}I-meta-iodobenzylguanidine in heart failure: implications of endpoint selection and quantitative analysis on clinical decisions

    Energy Technology Data Exchange (ETDEWEB)

    Petretta, Mario [University Federico II, Department of Translational Medicine, Naples (Italy); Pellegrino, Teresa [National Council of Research, Institute of Biostructure and Bioimaging, Naples (Italy); Cuocolo, Alberto [University Federico II, Department of Advanced Biomedical Sciences, Naples (Italy)

    2014-09-15

    There are a number of radiopharmaceuticals that can be used to investigate autonomic neuronal functions. Among these, the norepinephrine analogue meta-iodobenzylguanidine (MIBG) labelled with {sup 123}I has been widely used and validated as a marker of adrenergic neuron function. The first study addressing the prognostic value of {sup 123}I-MIBG imaging in heart failure (HF) was that of Merlet et al. in 90 patients suffering from either ischaemic or idiopathic cardiomyopathy. After publication of this study, more recent studies have indicated that patients with HF and decreased late heart-to-mediastinum (H/M) ratio or increased myocardial MIBG washout have a worse prognosis than those with normal quantitative myocardial MIBG parameters. However, MIBG scintigraphy has still to reach widespread clinical application mainly because of the value of other cheaper variables such as left ventricular (LV) ejection fraction and brain natriuretic peptide (BNP) plasma levels. The possibility that the detection of mechanical dyssynchrony by innervation imaging might identify patients who would benefit from resynchronization pacing is another area of research interest. In 2010, the landmark AdreView Myocardial Imaging for Risk Evaluation in Heart Failure (ADMIRE-HF) study was published. This trial consisted of two identical open-label phase III studies enrolling patients in 96 sites in North America and Europe to provide prospective validation of the prognostic role of quantitation of sympathetic cardiac innervation using MIBG. The primary endpoint was the relationship between late HIM ratio and time-to-occurrence of the first event among a combination of HF progression, potentially life-threatening arrhythmic event, and cardiac death. The authors found that a HIM ratio <1.6 provided prognostic information beyond LV ejection fraction, BNP, and New York Heart Association (NYHA) functional class at the time of enrolment. In a recent article in this journal, Parker et al. present

  14. Cardiac Sarcoidosis.

    Science.gov (United States)

    Birnie, David; Ha, Andrew C T; Gula, Lorne J; Chakrabarti, Santabhanu; Beanlands, Rob S B; Nery, Pablo

    2015-12-01

    Studies suggest clinically manifest cardiac involvement occurs in 5% of patients with pulmonary/systemic sarcoidosis. The principal manifestations of cardiac sarcoidosis (CS) are conduction abnormalities, ventricular arrhythmias, and heart failure. Data indicate that an 20% to 25% of patients with pulmonary/systemic sarcoidosis have asymptomatic (clinically silent) cardiac involvement. An international guideline for the diagnosis and management of CS recommends that patients be screened for cardiac involvement. Most studies suggest a benign prognosis for patients with clinically silent CS. Immunosuppression therapy is advocated for clinically manifest CS. Device therapy, with implantable cardioverter defibrillators, is recommended for some patients.

  15. Characterisation of the primary afferent spinal innervation of mouse uterus

    Directory of Open Access Journals (Sweden)

    Geraldine eHerweijer

    2014-07-01

    Full Text Available The primary afferent innervation of the uterus is incompletely understood. The aim of this study was to identify the location and characteristics of primary afferent neurons that innervate the uterine horn of mice and correlate the different morphological types of putative primary afferent nerve endings, immunoreactive to the sensory marker, calcitonin gene related peptide (CGRP. Using retrograde tracing, injection of 5-10µL of 1,1'-didodecyl-3,3,3,3'-tetramethylindocarbocyanine perchlorate (DiI into discrete single sites in each uterine horn revealed a biomodal distribution of sensory neurons in dorsal root ganglia (DRG with peak labelling occurring between T13-L3 and a second smaller peak between L6-S1. The mean cross sectional area of labelled cells was 463 µm2 +/- SEM. A significantly greater proportion of labelled neurons consisted of small cell bodies (<300 µm2 in the sacral spinal cord (S2 compared with peak labelling at the lumbar (L2 region. In both sections and whole mount preparations, immunohistochemical staining for CGRP revealed substantial innervation of the uterus by CGRP-positive nerve fibres located primarily at the border between the circular and longitudinal muscle layers (N=4. The nerve endings were classified into three distinct types: single, branching or complex, that often aligned preferentially in either the circular or longitudinal axis of the smooth muscles. Complex endings were often associated with mesenteric vessels. We have identified that the cell bodies of primary afferent neurons innervating the mouse uterus lie primarily in DRG at L2 and S1 spinal levels. Also, the greatest density of CGRP immunoreactivity lies within the myometrium, with at least three different morphological types of nerve endings identified. These findings will facilitate further investigations into the mechanisms underlying sensory transduction in mouse uterus.

  16. Sudden cardiac death in multiple sclerosis caused by active demyelination of the medulla oblongata

    NARCIS (Netherlands)

    Hengstman, G.J.D.; Kusters, B.

    2011-01-01

    Cardiovascular autonomic dysfunction is not uncommon in multiple sclerosis (MS) and is related to the involvement of the vegetative areas of cardiac innervations in the medulla oblongata. It has been suggested that this may contribute to the occurrence of sudden death in MS. In this case report, we

  17. Gender differences in sympathetic nervous system regulation.

    Science.gov (United States)

    Hinojosa-Laborde, C; Chapa, I; Lange, D; Haywood, J R

    1999-02-01

    1. Females are protected against the development of hypertension. The purpose of the current review is to present the evidence for gender differences in the regulation of the sympatho-adrenal nervous system and to determine if these differences support the hypothesis that, in females, the regulation of the sympathetic nervous system (SNS) is altered such that sympatho-adrenal activation is attenuated or sympatho-adrenal inhibition is augmented. 2. The central control of sympatho-adrenal function is different in females and responses vary during the oestral and menstrual cycles. Pathways regulating the SNS appear to be less sensitive to excitatory stimuli and more sensitive to inhibitory stimuli in females compared with males. 3. Gender differences in arterial baroreflex sensitivity suggest that females may have a greater baroreflex sensitivity, such that alterations in blood pressure are more efficiently controlled than in males. Cardiopulmonary reflex inhibition of sympathetic nerve activity is greater in females, possibly resulting in a greater renal excretory function. 4. An attenuated sensitivity to adrenergic nerve stimulation, but not to noradrenaline (NA), suggests that gender differences in noradrenergic neurotransmission may protect females against sympathetic hyperactivity. Gender differences in the regulation of NA release via presynaptic alpha 2-adrenoceptors, the vasoconstrictor response to the cotransmitter neuropeptide Y and the clearance of catecholamines are consistent with this hypothesis. 5. Similarly, attenuated stress-induced increases in plasma catecholamines in women suggest that females are less sensitive and/or less responsive to adrenal medullary activation. This is supported by findings of gender differences in adrenal medullary catecholamine content, release and degradation. 6. We conclude that there is strong evidence that supports the hypothesis that, in females, the regulation of the SNS is altered such that sympatho

  18. [Density of the neurovegetative innervation of the uterus of rats].

    Science.gov (United States)

    Canon, E; Timmermans, L G

    1986-01-01

    Using the Karnovsky and Roots modified by E1 Badawi and Schenk's technic for the cholinergic innervation and with the method of Lindvall and Björklund modified by de la Torre and Surgeon for the adrenergic ones, we demonstrate the innervation of each tissular layer, in cervix, corpus and cornua of the uterus of the she-rat in pro-oestrus state. A statistic evaluation is established for the different areas. The density of cholinergic innervation is richer than the adrenergic one. The number of cholinergic fibers is maximum in the cervix. It decreases in corpus and cornua especially in the mucosal and sub-mucosal layers. The density of the muscular nervous network is predominant in the corpus versus the cervix. The number of adrenergic nerves is maximum in corpus it diminishes in the cervix and the cornua. In each region, the muscular adrenergic network domines over the other tissular layers. We confirm statistically morphometric non parametric observations of these other authors.

  19. Interaction of Xylamine with peripheral sympathetic neurons

    Energy Technology Data Exchange (ETDEWEB)

    Ransom, R.W.; Waggaman, L.A.; Cho, A.K.

    1985-09-30

    Xylamine (XYL) administered to intact rats caused a 70-80% reduction in norepinephrine (NE) uptake by the vas deferens but had little or no effect on NE content in that tissue. The vas deferens accumulates /sup 3/H-XYL in vitro by a desmethylimipramine (DMI)-sensitive mechanism. Vasa deferentia from 6-hydroxydopamine (60HDA) pretreated animals exhibited a 80% reduction in both NE content and XYL uptake activity. These results indicate that XYL is taken up by sympathetic nerve terminals and can reduce NE uptake activity without depleting terminals of neurotransmitter. 9 references, 4 tables.

  20. Literary ethnographic writing as sympathetic experiment

    DEFF Research Database (Denmark)

    Dalsgaard, Anne Line

    perhaps only implicitly) of research. But we have no direct access to the subjective world of others and can only inhabit their point of view by way of imagination. Writing literary ethnographic text is one way, I will argue, of experimenting with such sympathetic imagination. By putting together observed...... not propose a radical turn towards literary writing in anthropology. Rather, I suggest that we include the courage of imagination inherent to literature and the accompanying doubt into our existing endeavor, if not for anything else, then for the sake of a more human relationship with our so-called informants....

  1. Age-related changes in rhythmic electrical activity in the cervical sympathetic trunk in rats and cats.

    Science.gov (United States)

    Maslyukov, P M; Korzina, M B; Emanuilov, A I

    2010-03-01

    Baseline electrical activity in the cervical sympathetic trunk was studied in neonatal rats and cats and at ages 10, 20, and 30 days and two and six months, using spectral analysis. Rats from the neonatal period to the end of the first month of life and cats to 20 days of life showed increases at the amplitudes of electrical oscillations. From birth, all animals showed oscillations in the respiratory and cardiac rhythms. From day 20, frequencies with a cardiac component in rats dominated the power spectrum. The proportion of other frequencies, not associated with the cardiac or respiratory rhythms, was smaller. In cats, unlike the situation in rats, there were no age-related changes in the spectral composition of baseline electrical activity. High-frequency oscillations were recorded in cats from birth.

  2. The Human Sympathetic Nervous System Response to Spaceflight

    Science.gov (United States)

    Ertl, Andrew C.; Diedrich, Andre; Paranjape, Sachin Y.; Biaggioni, Italo; Robertson, Rose Marie; Lane, Lynda D.; Shiavi, Richard; Robertson, David

    2003-01-01

    The sympathetic nervous system is an important part of the autonomic (or automatic) nervous system. When an individual stands up, the sympathetic nervous system speeds the heart and constricts blood vessels to prevent a drop in blood pressure. A significant number of astronauts experience a drop in blood pressure when standing for prolonged periods after they return from spaceflight. Difficulty maintaining blood pressure with standing is also a daily problem for many patients. Indirect evidence available before the Neurolab mission suggested the problem in astronauts while in space might be due partially to reduced sympathetic nervous system activity. The purpose of this experiment was to identify whether sympathetic activity was reduced during spaceflight. Sympathetic nervous system activity can be determined in part by measuring heart rate, nerve activity going to blood vessels, and the release of the hormone norepinephrine into the blood. Norepinephrine is a neurotransmitter discharged from active sympathetic nerve terminals, so its rate of release can serve as a marker of sympathetic nervous system action. In addition to standard cardiovascular measurements (heart rate, blood pressure), we determined sympathetic nerve activity as well as norepinephrine release and clearance on four crewmembers on the Neurolab mission. Contrary to our expectation, the results demonstrated that the astronauts had mildly elevated resting sympathetic nervous system activity in space. Sympathetic nervous system responses to stresses that simulated the cardiovascular effects of standing (lower body negative pressure) were brisk both during and after spaceflight. We concluded that, in the astronauts tested, the activity and response of the sympathetic nervous system to cardiovascular stresses appeared intact and mildly elevated both during and after spaceflight. These changes returned to normal within a few days.

  3. Cardiac Malpositions

    Energy Technology Data Exchange (ETDEWEB)

    Yoo, Shi Joon; Im, Chung Gie; Yeon, Kyung Mo; Hasn, Man Chung [Seoul National University College of Medicine, Seoul (Korea, Republic of)

    1979-06-15

    Cardiac Malposition refers to any position of the heart other than a left-sided heart in a situs solitus individual. Associated cardiac malformations are so complex that even angiocardiographic and autopsy studies may not afford an accurate information. Although the terms and classifications used to describe the internal cardiac anatomy and their arterial connections in cardiac malpositions differ and tend to be confusing, common agreement exists on the need for a segmental approach to diagnosis. Authors present 18 cases of cardiac malpositions in which cardiac catheterization and angiocardiography were done at the Department of Radiology, Seoul National University Hospital between 1971 and 1979. Authors analyzed the clinical, radiographic, operative and autopsy findings with the emphasis on the angiocardiographic findings. The results are as follows: 1. Among 18 cases with cardiac malpositions, 6 cases had dextrocardia with situs inversus, 9 cases had dextrocardia with situs solitus and 3 cases had levocardia with situs inversus. 2. There was no genuine exception to visceroatrial concordance rule. 3. Associated cardiac malpositions were variable and complex with a tendency of high association of transposition and double outlet varieties with dextrocardia in situs solitus and levocardia in situs inversus. Only one in 6 cases of dextrocardia with situs inversus had pure transposition. 4. In two cases associated pulmonary atresia was found at surgery which was not predicted by angiocardiography. 5. Because many of the associated complex lesions can be corrected surgically provided the diagnosis is accurate, the selective biplane angiocardiography with or without cineradiography is essential.

  4. Selective innervation of fast and slow muscle regions during early chick neuromuscular development.

    Science.gov (United States)

    Rafuse, V F; Milner, L D; Landmesser, L T

    1996-11-01

    The electrical properties of adult motoneurons are well matched to the contractile properties of the fast or slow muscle fibers that they innervate. How this precise matching occurs developmentally is not known. To investigate whether motoneurons exhibit selectivity in innervating discrete muscle regions, containing either fast or slow muscle fibers during early neuromuscular development, we caused embryonic chick hindlimb muscles to become innervated by segmentally inappropriate motoneurons. We used the in vitro spinal cord-hindlimb preparation to identify electrophysiologically the pools of foreign motoneurons innervating the posterior iliotibialis (pITIB), an all-fast muscle, and the iliofibularis (IFIB), a partitioned muscle containing discrete fast and slow regions. The results showed that the pITIB and the fast region of the IFIB were exclusively innervated by motoneurons that normally supply fast muscles. In contrast, the slow region of the IFIB was always innervated by motoneuron pools that normally supply slow muscles. Some experimental IFIB muscles lacked a fast region and were innervated solely by "slow" motoneurons. In addition, the intramuscular nerve branching patterns were always appropriate to the fast-slow nature of the muscle (region) innervated. The selective innervation was found early in the motoneuron death period, and we found no evidence that motoneurons grew into appropriate muscle regions, but failed to form functional contacts. Together, these results support the hypothesis that different classes of motoneurons exhibit molecular differences that allow them to project selectively to, and innervate, muscle fibers of the appropriate type during early neuromuscular development.

  5. Role of the autonomic nervous system in modulating cardiac arrhythmias.

    Science.gov (United States)

    Shen, Mark J; Zipes, Douglas P

    2014-03-14

    The autonomic nervous system plays an important role in the modulation of cardiac electrophysiology and arrhythmogenesis. Decades of research has contributed to a better understanding of the anatomy and physiology of cardiac autonomic nervous system and provided evidence supporting the relationship of autonomic tone to clinically significant arrhythmias. The mechanisms by which autonomic activation is arrhythmogenic or antiarrhythmic are complex and different for specific arrhythmias. In atrial fibrillation, simultaneous sympathetic and parasympathetic activations are the most common trigger. In contrast, in ventricular fibrillation in the setting of cardiac ischemia, sympathetic activation is proarrhythmic, whereas parasympathetic activation is antiarrhythmic. In inherited arrhythmia syndromes, sympathetic stimulation precipitates ventricular tachyarrhythmias and sudden cardiac death except in Brugada and J-wave syndromes where it can prevent them. The identification of specific autonomic triggers in different arrhythmias has brought the idea of modulating autonomic activities for both preventing and treating these arrhythmias. This has been achieved by either neural ablation or stimulation. Neural modulation as a treatment for arrhythmias has been well established in certain diseases, such as long QT syndrome. However, in most other arrhythmia diseases, it is still an emerging modality and under investigation. Recent preliminary trials have yielded encouraging results. Further larger-scale clinical studies are necessary before widespread application can be recommended.

  6. Phenotypic alterations of neuropeptide Y and calcitonin gene-related peptide-containing neurons innervating the rat temporomandibular joint during carrageenan-induced arthritis

    Directory of Open Access Journals (Sweden)

    J.P. Damico

    2012-10-01

    Full Text Available The aim of this study was to identify immunoreactive neuropeptide Y (NPY and calcitonin gene-related peptide (CGRP neurons in the autonomic and sensory ganglia, specifically neurons that innervate the rat temporomandibular joint (TMJ. A possible variation between the percentages of these neurons in acute and chronic phases of carrageenan-induced arthritis was examined. Retrograde neuronal tracing was combined with indirect immunofluorescence to identify NPY-immunoreactive (NPY-IR and CGRP- immunoreactive (CGRP-IR neurons that send nerve fibers to the normal and arthritic temporomandibular joint. In normal joints, NPY-IR neurons constitute 78±3%, 77±6% and 10±4% of double-labeled nucleated neuronal profile originated from the superior cervical, stellate and otic ganglia, respectively. These percentages in the autonomic ganglia were significantly decreased in acute (58±2% to superior cervical ganglion and 58±8% to stellate ganglion and chronic (60±2% to superior cervical ganglion and 59±15% to stellate ganglion phases of arthritis, while in the otic ganglion these percentages were significantly increased to 19±5% and 13±3%, respectively. In the trigeminal ganglion, CGRP-IR neurons innervating the joint significantly increased from 31±3% in normal animals to 54±2% and 49±3% in the acute and chronic phases of arthritis, respectively. It can be concluded that NPY neurons that send nerve fibers to the rat temporomandibular joint are located mainly in the superior cervical, stellate and otic ganglia. Acute and chronic phases of carrageenan-induced arthritis lead to an increase in the percentage of NPY-IR parasympathetic and CGRP-IR sensory neurons and decrease in the percentage of NPY-IR sympathetic neurons related to TMJ innervation.

  7. Role of Nuclear Medicine in the cardiac resinchronization therapy

    Energy Technology Data Exchange (ETDEWEB)

    Brandao, Simone Cristina Soares, E-mail: simonecordis@yahoo.com.br [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil); Giorgi, Maria Clementina Pinto; D' Orio, Silvana Angelina; Meneghetti, Jose Claudio [Instituto do Coracao (InCor/FM/USP), Sao Paulo, SP (Brazil)

    2011-10-15

    Cardiac resynchronization therapy (CRT) emerged as one of the most promising approaches in the treatment of cardiac dyssynchrony in heart failure patients' refractory to medical treatment. However, despite very promising clinical and functional results, individual response analyses show that a significant number of patients do not respond to treatment. The role of nuclear medicine and molecular imaging in the selection of CRT candidates by the assessment of cardiac dyssynchrony, myocardial viability, myocardial perfusion and blood flow and sympathetic cardiac activity has been discussed in this review. The potential utilization of this tool to improve the comprehension of detrimental effects of dyssynchrony on cardiac function and the evaluation and monitoring of the response to CRT were also considered. Other molecular targets that characterize glucose and fatty acid metabolism, apoptosis, angiotensin converting enzyme activity and angiogenesis that can be evaluated with this technique were described. (author)

  8. Chain Reconnections observed in Sympathetic Eruptions

    CERN Document Server

    Joshi, Navin Chandra; Magara, Tetsuya; Guo, Yang; Aulanier, Guillaume

    2016-01-01

    The nature of various plausible causal links between sympathetic events is still a controversial issue. In this work, we present multi-wavelength observations of sympathetic eruptions, associated flares and coronal mass ejections (CMEs) occurring on 2013 November 17 in two close-by active regions. Two filaments i.e., F1 and F2 are observed in between the active regions. Successive magnetic reconnections, caused by different reasons (flux cancellation, shear and expansion) have been identified during the whole event. The first reconnection occurred during the first eruption via flux cancellation between the sheared arcades overlying filament F2, creating a flux rope and leading to the first double ribbon solar flare. During this phase we observed the eruption of overlaying arcades and coronal loops, which leads to the first CME. The second reconnection is believed to occur between the expanding flux rope of F2 and the overlying arcades of the filament F1. We suggest that this reconnection destabilized the equi...

  9. Sympathetic adaptations to one-legged training

    Science.gov (United States)

    Ray, C. A.

    1999-01-01

    The purpose of the present study was to determine the effect of leg exercise training on sympathetic nerve responses at rest and during dynamic exercise. Six men were trained by using high-intensity interval and prolonged continuous one-legged cycling 4 day/wk, 40 min/day, for 6 wk. Heart rate, mean arterial pressure (MAP), and muscle sympathetic nerve activity (MSNA; peroneal nerve) were measured during 3 min of upright dynamic one-legged knee extensions at 40 W before and after training. After training, peak oxygen uptake in the trained leg increased 19 +/- 2% (P training (108 +/- 5 to 96 +/- 5 beats/min and 132 +/- 8 to 119 +/- 4 mmHg, respectively, during the third minute of exercise; P training. However, MSNA was significantly less during the third minute of exercise after training (32 +/- 2 to 22 +/- 3 bursts/min; P training effect on MSNA remained when MSNA was expressed as bursts per 100 heartbeats. Responses to exercise in five untrained control subjects were not different at 0 and 6 wk. These results demonstrate that exercise training prolongs the decrease in MSNA during upright leg exercise and indicates that attenuation of MSNA to exercise reported with forearm training also occurs with leg training.

  10. Renal sympathetic denervation: MDCT evaluation of the renal arteries.

    LENUS (Irish Health Repository)

    Hutchinson, Barry D

    2013-08-01

    Percutaneous transluminal renal sympathetic denervation is a new treatment of refractory systemic hypertension. The purpose of this study was to assess the clinical utility of MDCT to evaluate the anatomic configuration of the renal arteries in the context of renal sympathetic denervation.

  11. Reflex sympathetic dystrophy: Early treatment and psychological aspects

    NARCIS (Netherlands)

    Geertzen, J.H.B.; De Bruijn, H.; De Bruijn-Kofman, A.T.; Arendzen, J.H.

    1994-01-01

    We report the results of two prospective studies of early treatment and psychological aspects in a series of 26 patients with sympathetic reflex dystrophy of the hand in which treatment was started within 3 months after diagnosis. Ismelin blocks is an often used therapy in sympathetic reflex dystrop

  12. Sympathetic hyperactivity - A hidden enemy in chronic kidney disease patients

    NARCIS (Netherlands)

    Blankestijn, Peter J.

    2007-01-01

    Chronic kidney disease is often characterized by the presence of sympathetic hyperactivity. The aim of this brief review is to summarize available knowledge on the pathogenesis of sympathetic hyperactivity and to discuss its clinical relevance, the consequences of this knowledge for the choice of tr

  13. Lower limb pain in sympathetic-sensory coupling

    Institute of Scientific and Technical Information of China (English)

    Hongjun Yang; Kairun Peng; Sanjue Hu; Li Xuan

    2011-01-01

    Previous studies have shown that sympathetic nerves are related to certain types of pain, and this phenomenon is referred to as sympathetic-sensory coupling. Chronic pain resulting from nerve injury can be exacerbated by sympathetic stimulation or relieved by sympathetic inhibition. In the present study, the correlation between pain and sympathetic nerves was analyzed in patients with severe pain in lower limbs, as well as in a chronically compressed dorsal root ganglion (CCD) rat model (model of low back pain and sciatica). Patients with severe pain in the lower limbs underwent chemical lumbar sympathectomy (CLS), and the analgesic effects of CLS were compared with painkillers. Results demonstrated significantly relieved lower limb pain following CLS, and the analgesic effects of CLS were superior to those seen with painkillers. In the CCD rat model, dorsal root ganglion neuronal activity significantly increased as a result of electrical stimulation to the sympathetic nerves. These results suggest that sympathetic nerves are closely associated with pain and sympathetic-sensory coupling is likely in lower limb pain in both patients and rat models of CCD.

  14. A Case Report of Renal Sympathetic Denervation for the Treatment of Polymorphic Ventricular Premature Complexes

    Science.gov (United States)

    Kiuchi, Márcio Galindo; Vitorio, Frederico Puppim; da Silva, Gustavo Ramalho; Paz, Luis Marcelo Rodrigues; Souto, Gladyston Luiz Lima

    2015-01-01

    Abstract Premature ventricular complexes are very common, appearing most frequently in patients with hypertension, obesity, sleep apnea, and structural heart disease. Sympathetic hyperactivity plays a critical role in the development, maintenance, and aggravation of ventricular arrhythmias. Recently, Armaganijan et al reported the relevance of sympathetic activation in patients with ventricular arrhythmias and suggested a potential role for catheter-based renal sympathetic denervation in reducing the arrhythmic burden. In this report, we describe a 32-year-old hypertensive male patient presenting with a high incidence of polymorphic premature ventricular complexes on a 24 hour Holter monitor. Beginning 1 year prior, the patient experienced episodes of presyncope, syncope, and tachycardia palpitations. The patient was taking losartan 100 mg/day, which kept his blood pressure (BP) under control, and sotalol 160 mg twice daily. Bisoprolol 10 mg/day was used previously but was not successful for controlling the episodes. The 24 hour Holter performed after the onset of sotalol 160 mg twice daily showed a heart rate ranging between 48 (minimum)–78 (average)–119 (maximum) bpm; 14,286 polymorphic premature ventricular complexes; 3 episodes of nonsustained ventricular tachycardia, the largest composed of 4 beats at a rate of 197 bpm; and 14 isolated atrial ectopic beats. Cardiac magnetic resonance imaging with gadolinium perfusion performed at rest and under pharmacological stress with dipyridamole showed increased left atrial internal volume, preserved systolic global biventricular function, and an absence of infarcted or ischemic areas. The patient underwent bilateral renal sympathetic denervation. The only drug used postprocedure was losartan 25 mg/day. Three months after the patient underwent renal sympathetic denervation, the mean BP value dropped to 132/86 mmHg, the mean systolic/diastolic 24 hour ambulatory BP measurement was reduced to 128/83

  15. Renal Sympathetic Denervation by CT-Guided Ethanol Injection: A Phase II Pilot Trial of a Novel Technique

    Energy Technology Data Exchange (ETDEWEB)

    Ricke, J., E-mail: jens.ricke@med.ovgu.de; Seidensticker, M.; Becker, S. [Otto-von-Guericke University Magdeburg, Department of Radiology and Nuclear Medicine, Universitätsklinikum Magdeburg AöR (Germany); Schiefer, J. [Universitätsklinikum Magdeburg AöR, Department of Nephrology and Hypertension, Diabetes and Endocrinology (Germany); Adamchic, I.; Lohfink, K. [Otto-von-Guericke University Magdeburg, Department of Radiology and Nuclear Medicine, Universitätsklinikum Magdeburg AöR (Germany); Kandulski, M.; Heller, A.; Mertens, P. R. [Universitätsklinikum Magdeburg AöR, Department of Nephrology and Hypertension, Diabetes and Endocrinology (Germany)

    2016-02-15

    ObjectivesCT-guided ethanol-mediated renal sympathetic denervation in treatment of therapy-resistant hypertension was performed to assess patient safety and collect preliminary data on treatment efficacy.Materials and MethodsEleven patients with therapy-resistant hypertension (blood pressure of >160 mmHg despite three different antihypertensive drugs including a diuretic) and following screening for secondary causes were enrolled in a phase II single arm open label pilot trial of CT-guided neurolysis of sympathetic renal innervation. Primary endpoint was safety, and secondary endpoint was a decrease of the mean office as well as 24-h systolic blood pressure in follow-up. Follow-up visits at 4 weeks, 3, and 6 months included 24-h blood pressure assessments, office blood pressure, laboratory values, as well as full clinical and quality of life assessments.ResultsNo toxicities ≥3° occurred. Three patients exhibited worsened kidney function in follow-up analyses. When accounting all patients, office systolic blood pressure decreased significantly at all follow-up visits (maximal mean decrease −41.2 mmHg at 3 months). The mean 24-h systolic blood pressure values decreased significantly at 3 months, but not at 6 months (mean: −9.7 and −6.3 mmHg, respectively). Exclusion of five patients who had failed catheter-based endovascular denervation and/or were incompliant for antihypertensive drug intake revealed a more pronounced decrease of 24-h systolic blood pressure (mean: −18.3 and −15.2 mmHg at 3 and 6 months, p = 0.03 and 0.06).ConclusionCT-guided sympathetic denervation proved to be safe and applicable under various anatomical conditions with more renal arteries and such of small diameter.

  16. Dynamic Radiographic Analysis of Sympathetic Cervical Spondylosis Instability

    Institute of Scientific and Technical Information of China (English)

    Jun Qian; Ye Tian; Gui-xing Qiu; Jian-hua Hu

    2009-01-01

    Objective To investigate the correlation between subaxial cervical spine instability and cervical spondylotic sympathetic symptoms as well as the difference of cervical spondylotic subaxial instability between male and female patients. Methods We analyzed retrospectively 318 surgical cases of cervical spondylosis treated at Department of Orthopedic Surgery of Peking Union Medical College Hospital between July 2003 and December 2007. All cases were divided into group A without sympathetic symptoms (n=284) and group B with sympathetic symptoms (n=34). Angular and horizontal translation values between two adjacent vertebral bodies from C2 to C7 were measured separately on hyperflexion and hyperextension lateral cervical spine radiographs. Fisher's exact test was used to evaluate the correlation between subaxial cervical instability and sympathetic symptoms. Intragroup correlation between patient gender and subaxial cervical instability was also evaluated. Results Subaxial instability incidences in groups A and B were 21.8% (62/284) and 55.9% (19/34), respectively. Statistical analysis indicated a definite correlation between subaxial cervical instability and sympathetic symptoms (P=0.000). Among patients without sympathetic symptoms, subaxial instability incidences were 21.4% (37/173) in males and 22.5% (25/111) in females, respectively (P=0.883). While among patients with sympathetic symptoms, subaxial instability incidences were 27.3% (3/11) in males and 69.6% (16/23) in females, respectively, indicating significant difference (P=0.030). Subaxial instability was most commonly seen at C4-C5 intervertebral space in sympathetic cervical spondylosis patients. Conclusions High correlation exists between subaxial cervical spine instability and cervical spondylotic sympathetic symptoms, especially in female patients. Hyperextension and hyperflexion radiographs of cervical spine are important to assess sympathetic cervical spondylotic subaxial instability.

  17. Sympathetic predominance is associated with impaired endothelial progenitor cells and tunneling nanotubes in controlled-hypertensive patients.

    Science.gov (United States)

    de Cavanagh, Elena M V; González, Sergio A; Inserra, Felipe; Forcada, Pedro; Castellaro, Carlos; Chiabaut-Svane, Jorge; Obregón, Sebastián; Casarini, María Jesús; Kempny, Pablo; Kotliar, Carol

    2014-07-15

    Early endothelial progenitor cells (early EPC) and late EPC are involved in endothelial repair and can rescue damaged endothelial cells by transferring organelles through tunneling nanotubes (TNT). In rodents, EPC mobilization from the bone marrow depends on sympathetic nervous system activity. Indirect evidence suggests a relation between autonomic derangements and human EPC mobilization. We aimed at testing whether hypertension-related autonomic imbalances are associated with EPC impairment. Thirty controlled-essential hypertensive patients [systolic blood pressure/diastolic blood pressure = 130(120-137)/85(61-88) mmHg; 81.8% male] and 20 healthy normotensive subjects [114(107-119)/75(64-79) mmHg; 80% male] were studied. Mononuclear cells were cultured on fibronectin- and collagen-coated dishes for early EPC and late EPC, respectively. Low (LF)- and high (HF)-frequency components of short-term heart rate variability were analyzed during a 5-min rest, an expiration/inspiration maneuver, and a Stroop color-word test. Modulations of cardiac sympathetic and parasympathetic activities were evaluated by LF/HF (%) and HF power (ms(2)), respectively. In controlled-hypertensive patients, the numbers of early EPC, early EPC that emitted TNT, late EPC, and late EPC that emitted TNT were 41, 77, 50, and 88% lower than in normotensive subjects (P hypertensive patients, late EPC number was positively associated with cardiac parasympathetic reserve during the expiration/inspiration maneuver (rho = 0.45, P = 0.031) and early EPC with brachial flow-mediated dilation (rho = 0.655; P = 0.049); also, late TNT number was inversely related to cardiac sympathetic response during the stress test (rho = -0.426, P = 0.045). EPC exposure to epinephrine or norepinephrine showed negative dose-response relationships on cell adhesion to fibronectin and collagen; both catecholamines stimulated early EPC growth, but epinephrine inhibited late EPC growth. In controlled-hypertensive patients

  18. Cardiac autonomic nervous system activity in obesity.

    Science.gov (United States)

    Liatis, Stavros; Tentolouris, Nikolaos; Katsilambros, Nikolaos

    2004-08-01

    The development of obesity is caused by a disturbance of energy balance, with energy intake exceeding energy expenditure. As the autonomic nervous system (ANS) has a role in the regulation of both these variables, it has become a major focus of investigation in the fields of obesity pathogenesis. The enhanced cardiac sympathetic drive shown in most of the studies in obese persons might be due to an increase in their levels of circulating insulin. The role of leptin needs further investigation with studies in humans. There is a blunted response of the cardiac sympathetic nervous system (SNS) activity in obese subjects after consumption of a carbohydrate-rich meal as well as after insulin administration. This might be due to insulin resistance. It is speculated that increased SNS activity in obesity may contribute to the development of hypertension in genetically susceptible individuals. It is also speculated that the increase in cardiac SNS activity under fasting conditions in obesity may be associated with high cardiovascular morbidity and mortality.

  19. Evaluation of cardiac adrenergic neuronal damage in rats with doxorubicin-induced cardiomyopathy using iodine-131 MIBG autoradiography and PGP 9.5 immunohistochemistry

    Energy Technology Data Exchange (ETDEWEB)

    Jeon, T.J.; Lee, J.D. [Division of Nuclear Medicine, Department of Diagnostic Radiology, Yonsei University Medical College, Seoul (Korea); Research Institute of Radiological Science, Yonsei University Medical College, Seoul (Korea); Ha, J.-W. [Cardiology Division, Yonsei Cardiovascular Center, Yonsei University Medical College, Seoul (Korea); Yang, W.I.; Cho, S.H. [Department of Pathology, Yonsei University Medical College, Seoul (Korea)

    2000-06-01

    Doxorubicin is one of the most useful anticancer agents, but its repeated administration can induce irreversible cardiomyopathy as a major complication. The purpose of this study was to investigate doxorubicin toxicity on cardiac sympathetic neurons using iodine-131-metaiodobenzylguanidine (MIBG) and protein gene product (PGP) 9.5 immunohistochemistry, which is a marker of cardiac innervation. Wistar rats were treated with doxorubicin (2 mg/kg, i.v.) once a week for 4 (n=5), 6 (n=6) or 8 (n=7) weeks consecutively. Left ventricular ejection fraction (LVEF), calculated by M-mode echocardiography, was used as an indicator of cardiac function. Plasma noradrenaline (NA) concentration was measured by high-performance liquid chromatography (HPLC). {sup 131}I-MIBG uptake of the left ventricular wall (24 ROIs) was measured by autoradiography. {sup 131}I-MIBG uptake pattern was compared with histopathological results, the neuronal population on PGP 9.5 immunohistochemistry and the degree of myocyte damage assessed using a visual scoring system on haematoxylin and eosin and Masson's trichrome staining. LVEF was significantly decreased in the 8-week group (P<0.05). The serum NA level also showed no statistical difference until 4 weeks and was significantly increased in the 8-week group (P<0.05). MIBG uptake was decreased in the 6- and 8-week groups (P<0.05), and was closely correlated with the reduction in the number of nerve fibres on PGP 9.5 stain. Myocyte damage was seen only in the 8-week group. Neuronal population and the {sup 131}I-MIBG uptake ratio of subepicardium to subendocardium were significantly increased (P<0.05) in the 8-week group as compared with the control group. It may be concluded that radioiodinated MIBG is a reliable marker for the detection of cardiac adrenergic neuronal damage in doxorubicin-induced cardiomyopathy; it detects such damage earlier than do other clinical parameters and in this study showed a good correlation with the reduction in the

  20. Plasticity of autonomic nerves: differential effects of long-term guanethidine sympathectomy on the sensory innervation of the rat uterus during maturation.

    Science.gov (United States)

    Brauer, M M; Lincoln, J; Milner, P; Sarner, S; Blundell, D; Passaro, M; Corbacho, A; Burnstock, G

    1994-10-01

    The sensory nerves, containing substance P and calcitonin gene-related peptide, and noradrenaline-containing sympathetic nerves of the rat uterus were analyzed following long-term sympathectomy with guanethidine in prepubertal (four weeks), young adult (eight weeks) and fully adult animals (18 weeks). Immunohistochemical and histochemical methods were used in association with nerve density measurements and biochemical assays. The main findings were as follows: (1) long-term guanethidine treatment completely abolished the noradrenergic innervation of the uterine horn and parametrial tissue and markedly reduced the tissue levels of noradrenaline in both regions at the three ages analysed; (2) in the uterine horn guanethidine treatment had no effect on the tissue levels of either calcitonin gene-related peptide or substance P or on the density of calcitonin gene-related peptide-containing nerves, at any of the three ages studied; (3) in the parametrial tissue increased levels of calcitonin gene-related peptide were observed at 8 and 18 weeks of age, together with a significant increase in the density of calcitonin gene-related peptide-containing nerves. Substance P levels showed a transient increase in this tissue at eight weeks. In conclusion, long-term sympathectomy with guanethidine resulted in an increase in calcitonin gene-related peptide and substance P in sensory nerves in the parametrial tissue, but not in the uterine horn. The changes in the parametrial tissue only occurred after puberty. It is suggested that sensory nerves in the uterine horn may be less responsive to sympathetic denervation since loss of sympathetic nerves occurs as part of a normal physiological process during pregnancy in this region.

  1. Macaque cardiac physiology is sensitive to the valence of passively viewed sensory stimuli.

    Directory of Open Access Journals (Sweden)

    Eliza Bliss-Moreau

    Full Text Available Autonomic nervous system activity is an important component of affective experience. We demonstrate in the rhesus monkey that both the sympathetic and parasympathetic branches of the autonomic nervous system respond differentially to the affective valence of passively viewed video stimuli. We recorded cardiac impedance and an electrocardiogram while adult macaques watched a series of 300 30-second videos that varied in their affective content. We found that sympathetic activity (as measured by cardiac pre-ejection period increased and parasympathetic activity (as measured by respiratory sinus arrhythmia decreased as video content changes from positive to negative. These findings parallel the relationship between autonomic nervous system responsivity and valence of stimuli in humans. Given the relationship between human cardiac physiology and affective processing, these findings suggest that macaque cardiac physiology may be an index of affect in nonverbal animals.

  2. Localization of motoneurons innervating individual abdominal muscles of the cat

    Science.gov (United States)

    Miller, Alan D.

    1987-01-01

    The paper presents the results of a systematic investigation of the innervation of the cat's individual abdominal muscles. The segmental distribution of the different motor pools was determined by using electrical microstimulation of the ventral horn to produce visible localized muscle twitches and by retrograde transport of horseradish peroxidase injected into individual muscles. The segmental distribution of each motor pool was as follows: rectus abdominis, T4-L3; external oblique, T6-L3; transverse abdominis, T9-L3; and internal oblique, T13-L3.

  3. Sympathetic cooling of nanospheres with cold atoms

    Science.gov (United States)

    Montoya, Cris; Witherspoon, Apryl; Ranjit, Gambhir; Casey, Kirsten; Kitching, John; Geraci, Andrew

    2016-05-01

    Ground state cooling of mesoscopic mechanical structures could enable new hybrid quantum systems where mechanical oscillators act as transducers. Such systems could provide coupling between photons, spins and charges via phonons. It has recently been shown theoretically that optically trapped dielectric nanospheres could reach the ground state via sympathetic cooling with trapped cold atoms. This technique can be beneficial in cases where cryogenic operation of the oscillator is not practical. We describe experimental advances towards coupling an optically levitated dielectric nanosphere to a gas of cold Rubidium atoms. The sphere and the cold atoms are in separate vacuum chambers and are coupled using a one-dimensional optical lattice. This work is partially supported by NSF, Grant Nos. PHY-1205994,PHY-1506431.

  4. CHAIN RECONNECTIONS OBSERVED IN SYMPATHETIC ERUPTIONS

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    Joshi, Navin Chandra; Magara, Tetsuya [School of Space Research, Kyung Hee University, Yongin, Gyeonggi-Do, 446-701 (Korea, Republic of); Schmieder, Brigitte; Aulanier, Guillaume [LESIA, Observatoire de Paris, PSL Research University, CNRS Sarbonne Universités, Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Jansson, F-92195 Meudon (France); Guo, Yang, E-mail: navin@khu.ac.kr, E-mail: njoshi98@gmail.com [School of Astronomy and Space Science, Nanjing University, 210023 Nanjing (China)

    2016-04-01

    The nature of various plausible causal links between sympathetic events is still a controversial issue. In this work, we present multiwavelength observations of sympathetic eruptions, associated flares, and coronal mass ejections (CMEs) occurring on 2013 November 17 in two close active regions. Two filaments, i.e., F1 and F2, are observed in between the active regions. Successive magnetic reconnections, caused for different reasons (flux cancellation, shear, and expansion) have been identified during the whole event. The first reconnection occurred during the first eruption via flux cancellation between the sheared arcades overlying filament F2, creating a flux rope and leading to the first double-ribbon solar flare. During this phase, we observed the eruption of overlying arcades and coronal loops, which leads to the first CME. The second reconnection is believed to occur between the expanding flux rope of F2 and the overlying arcades of filament F1. We suggest that this reconnection destabilized the equilibrium of filament F1, which further facilitated its eruption. The third stage of reconnection occurred in the wake of the erupting filament F1 between the legs of the overlying arcades. This may create a flux rope and the second double-ribbon flare and a second CME. The fourth reconnection was between the expanding arcades of the erupting filament F1 and the nearby ambient field, which produced the bi-directional plasma flows both upward and downward. Observations and a nonlinear force-free field extrapolation confirm the possibility of reconnection and the causal link between the magnetic systems.

  5. Cardiac cameras.

    Science.gov (United States)

    Travin, Mark I

    2011-05-01

    Cardiac imaging with radiotracers plays an important role in patient evaluation, and the development of suitable imaging instruments has been crucial. While initially performed with the rectilinear scanner that slowly transmitted, in a row-by-row fashion, cardiac count distributions onto various printing media, the Anger scintillation camera allowed electronic determination of tracer energies and of the distribution of radioactive counts in 2D space. Increased sophistication of cardiac cameras and development of powerful computers to analyze, display, and quantify data has been essential to making radionuclide cardiac imaging a key component of the cardiac work-up. Newer processing algorithms and solid state cameras, fundamentally different from the Anger camera, show promise to provide higher counting efficiency and resolution, leading to better image quality, more patient comfort and potentially lower radiation exposure. While the focus has been on myocardial perfusion imaging with single-photon emission computed tomography, increased use of positron emission tomography is broadening the field to include molecular imaging of the myocardium and of the coronary vasculature. Further advances may require integrating cardiac nuclear cameras with other imaging devices, ie, hybrid imaging cameras. The goal is to image the heart and its physiological processes as accurately as possible, to prevent and cure disease processes.

  6. Arachidonic acid incorporation and turnover is decreased in sympathetically denervated rat heart.

    Science.gov (United States)

    Patrick, Casey B; McHowat, Jane; Rosenberger, Thad A; Rapoport, Stanley I; Murphy, Eric J

    2005-06-01

    Heart sympathetic denervation can accompany Parkinson's disease, but the effect of this denervation on cardiac lipid-mediated signaling is unknown. To address this issue, rats were sympathetically denervated with 6-hydroxydopamine (6-OHDA, 50 mg/kg ip) and infused with 170 muCi/kg of either [1-(14)C]palmitic acid ([1-(14)C]16:0) or [1-(14)C]arachidonic acid ([1-(14)C]20:4 n-6), and kinetic parameters were assessed using a steady-state radiotracer model. Heart norepinephrine and epinephrine levels were decreased 82 and 85%, respectively, in denervated rats, and this correlated with a 34% reduction in weight gain in treated rats. Fatty acid tracer uptake was not significantly different between groups for either tracer, although the dilution coefficient lambda was increased in [1-(14)C]20:4 n-6-infused rats, which indicates that less 20:4 n-6 was recycled in denervated rats. In [1-(14)C]16:0-infused rats, incorporation rate and turnover values of 16:0 in stable lipid compartments were unchanged, which is indicative of preservation of beta-oxidation. In [1-(14)C]20:4 n-6-infused rats, there were dramatic reductions in incorporation rate (60-84%) and turnover value (56-85%) in denervated rats that were dependent upon the lipid compartment. In addition, phospholipase A(2) activity was reduced 40% in treated rats, which is consistent with the reduction observed in 20:4 n-6 turnover. These results demonstrate marked reductions in 20:4 n-6 incorporation rate and turnover in sympathetic denervated rats and thereby suggest an effect on lipid-mediated signal transduction mediated by a reduction in phospholipase A(2) activity.

  7. Glutamate and GABA in vestibulo-sympathetic pathway neurons

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    Gay R Holstein

    2016-02-01

    Full Text Available The vestibulo-sympathetic reflex actively modulates blood pressure during changes in posture. This reflex allows humans to stand up and quadrupeds to rear or climb without a precipitous decline in cerebral perfusion. The vestibulo-sympathetic reflex pathway conveys signals from the vestibular end organs to the caudal vestibular nuclei. These cells, in turn, project to pre-sympathetic neurons in the rostral and caudal ventrolateral medulla (RVLM and CVLM, respectively. The present study assessed glutamate- and GABA-related immunofluorescence associated with central vestibular neurons of the vestibulo-sympathetic reflex pathway in rats. Retrograde FluoroGold tract tracing was used to label vestibular neurons with projections to RVLM or CVLM, and sinusoidal galvanic vestibular stimulation was employed to activate these pathways. Central vestibular neurons of the vestibulo-sympathetic reflex were identified by co-localization of FluoroGold and cFos protein, which accumulates in some vestibular neurons following galvanic stimulation. Triple-label immunofluorescence was used to co-localize glutamate- or GABA- labeling in the identified vestibulo-sympathetic reflex pathway neurons. Most activated projection neurons displayed intense glutamate immunofluorescence, suggestive of glutamatergic neurotransmission. To support this, anterograde tracer was injected into the caudal vestibular nuclei. Vestibular axons and terminals in RVLM and CVLM co-localized the anterograde tracer and vesicular glutamate transporter-2 signals. Other retrogradely-labeled cFos-positive neurons displayed intense GABA immunofluorescence. Vestibulo-sympathetic reflex pathway neurons of both phenotypes were present in the caudal medial and spinal vestibular nuclei, and projected to both RVLM and CVLM. As a group, however, triple-labeled vestibular cells with intense glutamate immunofluorescence were located more rostrally in the vestibular nuclei than the GABAergic neurons. Only the

  8. (123)I-Meta-iodobenzylguanidine Sympathetic Imaging: Standardization and Application to Neurological Diseases.

    Science.gov (United States)

    Nakajima, Kenichi; Yamada, Masahito

    2016-09-01

    (123)I-meta-iodobenzylguanidine (MIBG) has become widely applied in Japan since its introduction to clinical cardiology and neurology practice in the 1990s. Neurological studies found decreased cardiac uptake of (123)I-MIBG in Lewy-body diseases including Parkinson's disease and dementia with Lewy bodies. Thus, cardiac MIBG uptake is now considered a biomarker of Lewy body diseases. Although scintigraphic images of (123)I-MIBG can be visually interpreted, an average count ratio of heart-to-mediastinum (H/M) has commonly served as a semi-quantitative marker of sympathetic activity. Since H/M ratios significantly vary according to acquisition and processing conditions, quality control should be appropriate, and quantitation should be standardized. The threshold H/M ratio for differentiating Lewy-body disease is 2.0-2.1, and was based on standardized H/M ratios to comparable values of medium-energy collimators. Parkinson's disease can be separated from various types of parkinsonian syndromes using cardiac (123)I-MIBG, whereas activity is decreased on images of Lewy-body diseases using both (123)I-ioflupane for the striatum and (123)I-MIBG. Despite being a simple index, the H/M ratio of (123)I-MIBG uptake is reproducible and can serve as an effective tool to support a diagnosis of Lewy-body diseases in neurological practice.

  9. Impact of right upper pulmonary vein isolation on atrial vagal innervation and vulnerability to atrial fibrillation

    Institute of Scientific and Technical Information of China (English)

    LIU Yuan; ZHANG Shu-long; DONG Ying-xue; ZHAO Hong-wei; GAO Lian-jun; YIN Xiao-meng; LI Shi-jun; LIN Zhi-hu; YANG Yan-zong

    2006-01-01

    Background Based on the hypothesis that pulmonary vein isolation could result in the damage of the epicardial fat pads, this study aimed to investigated the impact of right upper pulmonary vein (RUPV) isolation on vagal innervation to atria.Methods Bilateral cervical sympathovagal trunks were decentralized in 6 dogs. Metoprolol was given to block sympathetic effects. Multipolar catheters were placed into the right atrium (RA) and coronary sinus (CS). RUPV isolation was performed via transseptal procedure. Atrial effective refractory period (ERP), vulnerability window (VW) of atrial fibrillation (AF), and sinus rhythm cycle length (SCL) were measured at RA and distal coronary sinus (CSd) at baseline and vagal stimulation before and after RUPV isolation. Serial sections of underlying tissues before and after ablation were stained with haematoxylin and eosin.Results SCL decreased significantly during vagal stimulation before RUPV isolation (197 ± 21 vs 13 ±32 beats per minute, P<0.001), but remained unchanged after RUPV isolation (162±29 vs 140±39 beats per minute,P>0.05). ERP increased significantly before RUPV isolation compared with that during vagal stimulation [(85.00±24.29) ms vs (21.67±9.83) ms at RA, P<0.001; (90.00± 15.49) ms vs (33.33±25.03) ms at CSd P<0.005],but ERP at baseline hardly changed after RUPV isolation compared with that during vagal stimulation [(103.33 ±22.50) vs (95.00± 16.43) ms at RA, P = 0.09; (98.33±24.83) vs (75.00±29.50) ms at CSd, P=0.009]. The ERP shortening during vagal stimulation after RUPV isolation decreased significantly [(63.33 ± 22.51) ms vs (8.33 ±9.83) ms at RA, P<0.005; (56.67±20.66) ms vs (23.33± 13.66) ms at CSd, P<0.05]. AF was rarely induced at baseline before and after RUPV isolation (VW close to 0), while VW of AF to vagal stimulation significantly decreased after RUPV isolation [(40.00± 10.95) vs 0 ms at RA, P<0.001; (45.00±32.09) vs (15.00±23.45) ms at CS, P <0.05]. The

  10. [Microscopic innervation and vascularization of the tongue. General study].

    Science.gov (United States)

    Fuentes, A; Sanchiz, O

    1992-01-01

    Our study deals with 23 prenatal human tongues, and a comparative study was carried out on one neonatal tongue and a few human and animal postnatal tongues. Sagittal and coronal sections were stained with various techniques. After the 7th week, the development of the nerves and their relationships with the neighboring structures can be observed. There are very few capillaries making up the superficial vascular network under the epithelium. The vessels whose walls are beginning to develop include the future red blood cells with their basophilic nuclei. During the whole process of evolution, there is a tight correlation between the collagen fibers and the neighboring structures. The innervation and vascularization--the latter with changes in the vascular walls--progressively increase. A short time before birth, the nerve fibers include their characteristic components, except for the Schmidt-Lantermann fissures. A considerable innervation advances towards the papillae, and anterior and posterior nerve networks enter the papillae, whose connective tissue includes groups of corpuscles on serial sections.

  11. Structural studies of innervation on nonpregnant rat uterus.

    Science.gov (United States)

    Garfield, R E

    1986-07-01

    Whole-mount preparations of the uterus and mesentery from nonpregnant rats were examined after staining with glyoxylic acid or acetylcholinesterase to demonstrate the innervation. Some uterine tissues were also evaluated by electron microscopy. Glyoxylic acid fluorescent nerves were present in the mesentery, mesometrium, and uterine wall exclusively around blood vessels. Acetylcholinesterase positive nerve fibers from Frankenhäuser's plexus (cervical ganglia) were associated with blood vessels and muscle in the uterine wall but not in the mesentery. Electron microscopy revealed nerve varicosities with granular vesicles associated with blood vessels and varicosities with agranular vesicles located near blood vessels and muscle cells. Treatment of animals for 3 days with 5- and 6-hydroxydopamine, respectively, increased granular size and damaged the varicosities with granular vesicles but did not change nerves with agranular vesicles or induce the presence of gap junctions. The results of this study suggest that blood vessels in the uterus are highly innervated by both adrenergic and other types of nerves that probably control blood flow. Nonadrenergic but not adrenergic nerves may also directly control myometrial contractility.

  12. Ontogeny of innervation of rat and ovine fetal adrenals.

    Science.gov (United States)

    Engeland, W C; Wotus, C; Rose, J C

    1998-01-01

    The formation of adrenocortical zonation occurs in rats during late gestation. Since adult cortical function is modulated by neural mediators, it is possible that the development of differentiated function is dependent on cortical innervation. The goal of this study was to compare the pattern and timing of rodent and ovine adrenal innervation during late organogenesis by staining with antibodies directed against the neuropeptides vasoactive intestinal peptide (VIP), calcitonin gene-related peptide (CGRP) and neuropeptide tyrosine (NPY) and the catecholamine biosynthetic enzyme, tyrosine hydroxylase (TOH). Rat adrenals were collected from fetal days 17-21 (term=21 days) and ovine adrenals from fetal days 101-136 (term=145 days). Adrenals were fixed, cryosectioned at 100 microns and immunostained using Cy3-conjugated secondary antibodies. In both species, staining of VIP, CGRP, NPY and TOH fibers was observed in the capsule and subcapsular layers of the cortex during gestation. In late gestation, VIP- and NPY-positive ganglions cells were observed near the medulla extending processes toward the outer cortex; in ovine adrenals, fibers from ganglion cells appeared to surround nests of outer cortical (presumably, zona glomerulosa) cells. These data show that phenotypically distinct neural elements appear at different stages of adrenocortical development. The presence of neural elements in contact with adrenal cortical cells supports the possibility for neural control of adrenocortical development.

  13. Role of the Sympathetic Nervous System in Stress-Mediated Cardiovascular Disease.

    Science.gov (United States)

    Hering, Dagmara; Lachowska, Kamila; Schlaich, Markus

    2015-10-01

    A high incidence of acute cardiovascular events and sudden cardiac death following unexpected acute emotional stress or a natural catastrophic disaster has been well-documented over the past decades. Chronic psychosocial factors have been shown to be directly linked to the development of hypertension, cardiovascular disease and stroke. Activation of various neurogenic pathways is an important mediator of acute and chronic stress-induced hypertension and heart disease. Heightened sympathetic activation has been shown to be a critical contributor linking psychogenic effects on cardiovascular regulation to serious and often fatal CV outcomes. Accordingly, several therapeutic approaches that attenuate autonomic imbalance via modulation of increased sympathetic outflow by either non-pharmacological or interventional means have been shown to alleviate clinical symptoms. Likewise stress reduction per se achieved with transcendental medicine has been linked to improved patient outcomes. Therapies that oppose adrenergic activity and/or have the potential to attenuate negative emotions are likely to reduce cardiovascular risk and its adverse consequences attributable to chronic mental stress.

  14. Short-term sertraline treatment suppresses sympathetic nervous system activity in healthy human subjects.

    Science.gov (United States)

    Shores, M M; Pascualy, M; Lewis, N L; Flatness, D; Veith, R C

    2001-05-01

    Increased sympathetic nervous system (SNS) activity has been associated with stress, major depression, aging, and several medical conditions. This study assessed the effect of the selective serotonin reuptake inhibitor (SSRI), sertraline, on sympathetic nervous system (SNS) activity in healthy subjects. Twelve healthy volunteers participated in a double-blind, placebo-controlled, norepinephrine (NE) kinetic study, in which the effects of sertraline on SNS activity were ascertained by determining NE plasma concentrations and NE plasma appearance rates and clearance rates in sertraline or placebo conditions. Subjects received 50 mg of sertraline or placebo for two days and then one week later underwent the same protocol with the other drug. By single compartmental analysis, plasma NE appearance rates were significantly lower in the sertraline compared to the placebo condition (0.26+/-0.10 vs 0.40+/-0.23 microg/m(2)/min; P=0.04). Our study found that the net effect of short-term SSRI treatment is an apparent suppression of SNS activity as indicated by a decreased plasma NE appearance rate in the sertraline condition. If this preliminary finding can be extended to long-term treatment of patients, this could have significant therapeutic relevance for treating depression in elderly patients or those with cardiac disease, in which elevated SNS activity may exacerbate underlying medical conditions.

  15. Habitual traffic noise at home reduces cardiac parasympathetic tone during sleep

    NARCIS (Netherlands)

    Graham, J.M.A.; Janssen, S.A.; Vos, H.; Miedema, H.M.E.

    2009-01-01

    The relationships between road and rail traffic noise with pre-ejection period (PEP) and with respiratory sinus arrhythmia (RSA) during sleep, as indices of cardiac sympathetic and parasympathetic nervous system tone, were investigated in the field (36 subjects, with 188 and 192 valid subject nights

  16. Effect of Yoga on migraine: A comprehensive study using clinical profile and cardiac autonomic functions

    Directory of Open Access Journals (Sweden)

    Ravikiran Kisan

    2014-01-01

    Conclusions: Intervention showed significant clinical improvement in both groups. Headache frequency and intensity were reduced more in Yoga with conventional care than the conventional care group alone. Furthermore, Yoga therapy enhanced the vagal tone and decreased the sympathetic drive, hence improving the cardiac autonomic balance. Thus, Yoga therapy can be effectively incorporated as an adjuvant therapy in migraine patients.

  17. Mapping and Analysis of the Connectome of Sympathetic Premotor Neurons in the Rostral Ventrolateral Medulla of the Rat Using a Volumetric Brain Atlas

    Science.gov (United States)

    Dempsey, Bowen; Le, Sheng; Turner, Anita; Bokiniec, Phil; Ramadas, Radhika; Bjaalie, Jan G.; Menuet, Clement; Neve, Rachael; Allen, Andrew M.; Goodchild, Ann K.; McMullan, Simon

    2017-01-01

    Spinally projecting neurons in the rostral ventrolateral medulla (RVLM) play a critical role in the generation of vasomotor sympathetic tone and are thought to receive convergent input from neurons at every level of the neuraxis; the factors that determine their ongoing activity remain unresolved. In this study we use a genetically restricted viral tracing strategy to definitively map their spatially diffuse connectome. We infected bulbospinal RVLM neurons with a recombinant rabies variant that drives reporter expression in monosynaptically connected input neurons and mapped their distribution using an MRI-based volumetric atlas and a novel image alignment and visualization tool that efficiently translates the positions of neurons captured in conventional photomicrographs to Cartesian coordinates. We identified prominent inputs from well-established neurohumoral and viscero-sympathetic sensory actuators, medullary autonomic and respiratory subnuclei, and supramedullary autonomic nuclei. The majority of inputs lay within the brainstem (88–94%), and included putative respiratory neurons in the pre-Bötzinger Complex and post-inspiratory complex that are therefore likely to underlie respiratory-sympathetic coupling. We also discovered a substantial and previously unrecognized input from the region immediately ventral to nucleus prepositus hypoglossi. In contrast, RVLM sympathetic premotor neurons were only sparsely innervated by suprapontine structures including the paraventricular nucleus, lateral hypothalamus, periaqueductal gray, and superior colliculus, and we found almost no evidence of direct inputs from the cortex or amygdala. Our approach can be used to quantify, standardize and share complete neuroanatomical datasets, and therefore provides researchers with a platform for presentation, analysis and independent reanalysis of connectomic data.

  18. Heart-brain interactions in cardiac arrhythmia.

    Science.gov (United States)

    Taggart, P; Critchley, H; Lambiase, P D

    2011-05-01

    This review examines current knowledge of the effects of higher brain centres and autonomic control loops on the heart with particular relevance to arrhythmogenesis. There is now substantial evidence that higher brain function (cortex), the brain stem and autonomic nerves affect cardiac electrophysiology and arrhythmia, and that these may function as an interactive system. The roles of mental stress and emotion in arrhythmogenesis and sudden cardiac death are no longer confined to the realms of anecdote. Advances in molecular cardiology have identified cardiac cellular ion channel mutations conferring vulnerability to arrhythmic death at the myocardial level. Indeed, specific channelopathies such as long QT syndrome and Brugada syndrome are selectively sensitive to either sympathetic or vagal stimulation. There is increasing evidence that afferent feedback from the heart to the higher centres may affect efferent input to the heart and modulate the cardiac electrophysiology. The new era of functional neuroimaging has identified the central neural circuitry in this brain-heart axis. Since precipitants of sudden fatal arrhythmia are frequently environmental and behavioural, central pathways translating stress into autonomic effects on the heart might be considered as therapeutic targets. These brain-heart interactions help explain the apparent randomness of sudden cardiac events and provide new insights into future novel therapies to prevent sudden death.

  19. Reduced innervation and delayed re-innervation after epithelial wounding in type 2 diabetic Goto-Kakizaki rats.

    Science.gov (United States)

    Wang, Feng; Gao, Nan; Yin, Jia; Yu, Fu-Shin X

    2012-12-01

    Patients with diabetes are at an increased risk for developing corneal complications including delayed wound healing and potential vision loss. To understand the cause of diabetic keratopathy, we investigated innervation and its correlation with delayed corneal epithelial wound healing in type 2 diabetic Goto-Kakizaki (GK) rats. GK rats are smaller than the age-matched control Wistar rats from which the GK rats were derived. The blood sugar levels of GK rats are significantly higher than those of Wistar rats. GK rats had increased rose bengal staining and cornea fragility. Fewer nerve fibers were detected compared with Wistar rats. Although nerve fiber densities detected by whole-mount immunohistochemistry were similar near the limbal region, in the central cornea the subbasal nerve plexuses were thinner, less abundant, and showed less branching in GK rats. Corneal epithelial wound closure was delayed and re-innervation was slow and incomplete in GK rats. These abnormalities were more apparent in older GK rats (12 months). Our data suggest that diabetic neuropathy occurs in the cornea of type 2 diabetic GK rats, and defects in the sensory nerve and/or tear film may contribute to diabetic keratopathy and delayed epithelial wound healing in diabetic corneas.

  20. Cerebrovascular innervation: adaptation to changes in metabolic demand and flow fluctuations in rats

    NARCIS (Netherlands)

    Denderen, Jacqueline Catharine Maria van

    2003-01-01

    The heterogeneous nature of the basal cerebral arteries is well illustrated by the differences in the extent of innervation as found in different species as well as the variation in the degree of innervation during ageing and disease. To explain these differences, we postulated a coupling between va

  1. [Adrenergic innervation of the uterus of the rat in various phases of the estrous cycle].

    Science.gov (United States)

    Rakitskaia, V V; Proimina, F I; Chudinov, Iu V

    1986-07-01

    Adrenergic innervation of the rat uterus is connected chiefly with vessel innervation. The highest density of fibers and the highest intensity of specific fluorescence is shown in the stage of dioestrus, the least those--in oestrus. These indices correlated with the estradiol and progesterone level in the plasma.

  2. Sympathetic skin response test in essential hypertensive patients

    Directory of Open Access Journals (Sweden)

    Ann Abdel Kader

    2012-01-01

    Conclusion Although SSR has a low diagnostic value in patients with essential hypertension, it might be a good diagnostic test particularly in the presence of signs and symptoms of sympathetic overactivity such as tachycardia and sweating.

  3. Obesity-Related Metabolic Syndrome: Mechanisms of Sympathetic Overactivity

    Directory of Open Access Journals (Sweden)

    Maria Paola Canale

    2013-01-01

    Full Text Available The prevalence of the metabolic syndrome has increased worldwide over the past few years. Sympathetic nervous system overactivity is a key mechanism leading to hypertension in patients with the metabolic syndrome. Sympathetic activation can be triggered by reflex mechanisms as arterial baroreceptor impairment, by metabolic factors as insulin resistance, and by dysregulated adipokine production and secretion from visceral fat with a mainly permissive role of leptin and antagonist role of adiponectin. Chronic sympathetic nervous system overactivity contributes to a further decline of insulin sensitivity and creates a vicious circle that may contribute to the development of hypertension and of the metabolic syndrome and favor cardiovascular and kidney disease. Selective renal denervation is an emerging area of interest in the clinical management of obesity-related hypertension. This review focuses on current understanding of some mechanisms through which sympathetic overactivity may be interlaced to the metabolic syndrome, with particular regard to the role of insulin resistance and of some adipokines.

  4. Adipose afferent reflex: sympathetic activation and obesity hypertension.

    Science.gov (United States)

    Xiong, X-Q; Chen, W-W; Zhu, G-Q

    2014-03-01

    Excessive sympathetic activity contributes to the pathogenesis of hypertension and the progression of the related organ damage. Adipose afferent reflex (AAR) is a sympatho-excitatory reflex that the afferent activity from white adipose tissue (WAT) increases sympathetic outflow and blood pressure. Hypothalamic paraventricular nucleus (PVN or PVH) is one of the central sites in the control of the AAR, and ionotropic glutamate receptors in the nucleus mediate the AAR. The AAR is enhanced in obesity and obesity hypertension. Enhanced WAT afferent activity and AAR contribute to the excessive sympathetic activation and hypertension in obesity. Blockage of the AAR attenuates the excessive sympathetic activity and hypertension. Leptin may be one of sensors in the WAT for the AAR, and is involved in the enhanced AAR in obesity and hypertension. This review focuses on the neuroanatomical basis and physiological functions of the AAR, and the important role of the enhanced AAR in the pathogenesis of obesity hypertension.

  5. Cardiac echinococcosis

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    Ivanović-Krstić Branislava A.

    2002-01-01

    Full Text Available Cardiac hydatid disease is rare. We report on an uncommon hydatid cyst localized in the right ventricular wall, right atrial wall tricuspid valve left atrium and pericard. A 33-year-old woman was treated for cough, fever and chest pain. Cardiac echocardiograpic examination revealed a round tumor (5.8 x 4 cm in the right ventricular free wall and two smaller cysts behind that tumor. There were cysts in right atrial wall and tricuspidal valve as well. Serologic tests for hydatidosis were positive. Computed tomography finding was consistent with diagnosis of hydatid cyst in lungs and right hylar part. Surgical treatment was rejected due to great risk of cardiac perforation. Medical treatment with albendazole was unsuccessful and the patient died due to systemic hydatid involvement of the lungs, liver and central nervous system.

  6. Schwanomma From Cervical Sympathetic Chain Ganglion - A Rare Presentation.

    Science.gov (United States)

    Asma, A Affee; Kannah, E

    2015-10-01

    Schwanommas arising from cervical sympathetic chain are tumours that are rare in occurrence. These lesions are usually difficult to differentiate from a vagal schwanomma and a carotid body tumour during the initial workup. In this report, a rarely seen huge cervical sympathetic chain schwanomma case with partial Horner's syndrome is being presented in detail, which to our known knowledge, is one of the few cases reported in literature.

  7. Sympathetic Nervous System, Hypertension, Obesity and Metabolic Syndrome.

    Science.gov (United States)

    Seravalle, Gino; Grassi, Guido

    2016-09-01

    Experimental and clinical studies have clearly shown the role of the sympathetic nervous system in the pathophysiology of several cardiovascular and non-cardiovascular diseases. This short review will be aimed at focusing and discussing the new information collected on two specific clinical conditions such as obesity and metabolic syndrome. The paper will briefly describe the four main mechanisms that represent the common link between these two pathophysiological conditions and that through the sympathetic nervous system contribute to increase the cardiovascular risk.

  8. Anatomical study of the variations in innervation of the orbicularis oculi by the facial nerve.

    Science.gov (United States)

    Ouattara, D; Vacher, C; de Vasconcellos, J-J Accioli; Kassanyou, S; Gnanazan, G; N'Guessan, B

    2004-02-01

    While the divisions of the facial nerve in the face are well known, the innervation of the orbicularis oculi by the different distal branches of the facial nerve is poorly described. To determine which branches of the facial nerve play a role in this innervation, the facial nerve was dissected in 30 fresh cadavers. The innervation of this muscle was in the form of two plexuses, a superior one, most often (93%) formed by the union of the temporal and superior zygomatic branches, and an inferior one, usually formed (63%) by the union of the inferior zygomatic and superior buccal branches. This new mode of innervation explains how, without damage to both plexuses, innervation of orbicularis oculi by the facial nerve remains functional. It also explains the often unsatisfactory results of treatment of primary blepharospasm, and the unusual character of palsies of this muscle in cervicofacial lifts.

  9. Factors influencing the cardiac MIBG accumulation

    Energy Technology Data Exchange (ETDEWEB)

    Takatsu, Hisato; Fujiwara, Hisayoshi [Gifu Univ. (Japan). School of Medicine

    1997-02-01

    Following factors possibly influencing the cardiac MIBG accumulation were examined mainly in mice. 1. The specific activity of the MIBG (meta-iodo-benzyl guanidine) on the neuronal and non-neuronal fractions. 2. Motor restriction stress on MIBG accumulation and washout. 3. Loading and restriction of sodium chloride on the accumulation and effect of suppression of renin-angiotensin system. 4. Examinations in Dahl rats. 125I- or 131I-MIBG was intravenously administered to mice at 74 kBq. At 30 min or 4 hr after administration, mice were sacrificed and their left ventricles were dissected out for measurement of radioactivity in a liquid scintillation counter. Salt-sensitive and -resistant Dahl rats were given with 37 MBq of 123I-MIBG and cardiac radioactivity was measured externally for calculation of washout. Factors examined were found highly correlated with the accumulation of MIBG and measurement of its washout was considered useful for evaluating sympathetic activity. (K.H.)

  10. Role of sympathetic nerve activity in the process of fainting

    Directory of Open Access Journals (Sweden)

    Satoshi eIwase

    2014-09-01

    Full Text Available Syncope is defined as a transient loss of consciousness and postural tone, characterized by rapid onset, short duration, and spontaneous recovery, and the process of syncope progression will be described with two types of sympathetic change. Simultaneous recordings of microneurographically recorded MSNA and continuous and noninvasive blood pressure measurement have disclose what is going on in the course of progression of the syncope. Vasovagal or neurally mediated syncope, three stages are identified in the course of syncope onset, oscillation, imbalance, and catastrophe phases. The vasovagal syncope is characterized by the sympathoexcitation, followed by vagal overcome via the Bezold-Jarisch reflex. Orthostatic syncope is caused by the response failure or lack of sympathetic nerve activity toward the orthostatic challenge followed by the fluid shift, and subsequent cerebral low perfusion. Four causes are considered for the compensatory failure, which triggers the orthostatic syncope; hypovolemia, increased pooling in the lower body, failure to activate the sympathetic activity, and failure of vasoconstriction against sympathetic vasoconstrictive stimulation. Many pathophysiological conditions were described in the viewpoint of 1 exaggerated sympathoexcitation and 2 failure to activate the sympathetic nerve. We conclude that the sympathetic nervous system can control the cardiovascular function, and its failure resulted syncope, however, responses of the system by microneurographically recorded MSNA would determine the pathophysiology of the onset and progression of syncope, explaining the treatment effect that could be achieved by the analysis of this mechanism.

  11. Sympathetic radiofrequency neurolysis for unilateral lumbar hyperhidrosis: a case report.

    Science.gov (United States)

    Aşik, Züleyha Soytürk; Orbey, Başak Ceyda; Aşik, Ibrahim

    2008-07-01

    Patients with hyperhidrosis suffer from physical, social and mental discomfort which often cannot be treated sufficiently using conservative measures. A new percutaneous approach to sympathectomy using radiofrequency denervation has seemed to offer longer duration of action and less incidence of post sympathetic neuralgia. This article reports the authors' experience with sympathetic RF neurolysis in a 35 year old male with right unilateral lumbar hyperhidrosis. Under scopy guided localization of the lumbar spine sympathetic blockade with local anesthetics to L2-5 vertebral levels were performed as a diagnostic block. Lesion effectiveness is monitored by bilateral feet skin temperature measurement. Clinical effects produced by the first sympathetic ganglion block were sustained for 1 week and then RF neurolysis of lumbar sympathetic ganglion was performed to the same levels for a longer effect. The procedure was accomplished within 30 minutes and the patient was discharged within 2 hours after the procedure. Hyperhidrosis was relieved after the procedure and there were no postsympathectomy neuralgia and sexual dysfunction. The patient obtained improvement of lumbar hyperhidrosis at his first month of follow- up and was satisfied with the outcome. In conclusion, RF neurolysis of lumbar sympathetic ganglions is a safe and effective palliative procedure with minimal invasiveness for relieving excessive sweat secretion in patients with localized hyperhidrosis.

  12. Paroxysmal sympathetic hyperactivity in neurological critical care

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    Rajesh Verma

    2015-01-01

    Full Text Available Introduction: Paroxysmal sympathetic hyperactivity (PSH is a clinical disorder mainly caused by traumatic brain injury, stroke, encephalitis and other types of brain injury. The clinical features are episodes of hypertension, tachycardia, tachypnea, fever and dystonic postures. In this study, we described clinical profile and outcome of six patients of PSH admitted in neurocritical care unit. Materials and Methods: This was a prospective observational study conducted at neurology critical care unit of a tertiary care center. All patients admitted at neurology critical unit during 6-month period from August 2013 to January 2014 were screened for the occurrence of PSH. The clinical details and outcome was documented. Results: PSH was observed in 6 patients. Male to female ratio was 5:1. Mean age ± SD was 36.67 ± 15.19 years. The leading causes were traumatic brain injury (two patients, stroke (two patients and Japanese encephalitis (JE (one patient and tuberculous meningitis (one patient. Conclusion: PSH is an unusual complication in neurocritical care. It prolonged the hospitalization and hampers recovery. The other life-threatening conditions that mimic PSH should be excluded. The association with JE and tuberculous meningitis was not previously described in literature.

  13. Sympathetic nervous system behavior in human obesity.

    Science.gov (United States)

    Davy, Kevin P; Orr, Jeb S

    2009-02-01

    The sympathetic nervous system (SNS) plays an essential role in the regulation of metabolic and cardiovascular homeostasis. Low SNS activity has been suggested to be a risk factor for weight gain and obesity development. In contrast, SNS activation is characteristic of a number of metabolic and cardiovascular diseases that occur more frequently in obese individuals. Until recently, the relation between obesity and SNS behavior has been controversial because previous approaches for assessing SNS activity in humans have produced inconsistent findings. Beginning in the early 1990s, many studies using state of the art neurochemical and neurophysiological techniques have provided important insight. The purpose of the present review is to provide an overview of our current understanding of the region specific alterations in SNS behavior in human obesity. We will discuss findings from our own laboratory which implicate visceral fat as an important depot linking obesity with skeletal muscle SNS activation. The influence of weight change on SNS behavior and the potential mechanisms and consequences of region specific SNS activation in obesity will also be considered.

  14. Pharmacological characterization of the inhibition by moxonidine and agmatine on the cardioaccelerator sympathetic outflow in pithed rats.

    Science.gov (United States)

    Cobos-Puc, Luis E; Villalón, Carlos M; Ramírez-Rosas, Martha B; Sánchez-López, Araceli; Lozano-Cuenca, Jair; Gómez-Díaz, Benjamín; MaassenVanDenBrink, Antoinette; Centurión, David

    2009-08-15

    This study analysed the inhibition produced by the agonists moxonidine (imidazoline I(1) receptors>alpha(2)-adrenoceptors) and agmatine (endogenous ligand of imidazoline I(1)/I(2) receptors), using B-HT 933 (6-ethyl-5,6,7,8-tetrahydro-4H-oxazolo[4,5-d]azepin-2-amine dihydrochloride; alpha(2)-adrenoceptors) for comparison, on the rat cardioaccelerator sympathetic outflow. Male Wistar rats were pithed and prepared to stimulate the cardiac sympathetic outflow or to receive i.v. bolus of exogenous noradrenaline. Sympathetic stimulation or noradrenaline produced, respectively, frequency-dependent and dose-dependent tachycardic responses. I.v. continuous infusions of moxonidine (3 and 10 microg/kg min), agmatine (1000 and 3000 microg/kg min) and B-HT 933 (30 and 100 microg/kg min) inhibited the tachycardic responses to sympathetic stimulation, but not those to noradrenaline. The cardiac sympatho-inhibition by either moxonidine (3 microg/kg min) or B-HT 933 (30 microg/kg min) was not modified by i.v. injections of saline or the antagonists AGN192403 [(+/-)-2-endo-Amino-3-exo-isopropylbicyclo[2.2.1]heptane hydrochloride; 3000microg/kg; imidazoline I(1) receptors] or BU224 (2-(4,5-dihydroimidazol-2-yl)quinoline hydrochloride; 300 microg/kg; imidazoline I(2) receptors) and abolished by rauwolscine (300 microg/kg; alpha(2)-adrenoceptors). At the same doses of these compounds, the sympatho-inhibition to moxonidine (10 microg/kg min) and agmatine (1000 microg/kg min) was: (1) not modified by saline, AGN192403 or BU224; (2) partially blocked by rauwolscine or the combination of rauwolscine plus BU224; and (3) abolished by the combination of rauwolscine plus AGN192403. These results demonstrate that the cardiac sympatho-inhibition to: (1) 3 microg/kg min moxonidine or 30 microg/kg min B-HT 933 involves alpha(2)-adrenoceptors; and (2) 10 microg/kg min moxonidine or 1000 microg/kg min agmatine involves alpha(2)-adrenoceptors and imidazoline I(1) receptors.

  15. Cardiac Rehabilitation

    Science.gov (United States)

    ... your risk of future heart problems, and to improve your health and quality of life. Cardiac rehabilitation programs increase ... exercise routine at home or at a local gym. You may also continue to ... health concerns. Education about nutrition, lifestyle and weight loss ...

  16. Sympathetic-leptin relationship in obesity: effect of weight loss.

    Science.gov (United States)

    Quilliot, Didier; Böhme, Philip; Zannad, Faiez; Ziegler, Olivier

    2008-04-01

    Obese patients have high plasma leptin concentrations that do not induce the expected responses on weight regulation, suggesting a leptin resistance in obesity. Elevated leptin levels are also thought to be related to a high sympathetic nervous system (SNS) activity. This effect could be preserved, lowered, or even abolished in obesity. We planned to investigate the possible association in a longitudinal study. Ninety-five normotensive healthy women, aged 40.4 +/- 11.4 years and body mass index of 33.2 +/- 2.3 kg/m(2), were studied. Baseline leptin, fat mass, and heart rate variability were measured and included in a 6-month longitudinal study. Body composition was measured by dual-energy x-ray absorption. Time domain heart rate variability, QT dynamicity, and spectral components on ambulatory electrocardiographs were analyzed. Dietary advice was given by a dietitian to the patient (maximum caloric reduction of 30%), and subjects were randomized in 3 treatment groups: sibutramine 10 mg, sibutramine 20 mg, or placebo. At baseline, low frequencies (LF) and the LF-high frequencies (HF) ratio, mainly related to the SNS, were negatively correlated to leptin concentration (r = -0.30, P = .002 and r = -0.36, P < .001) and to the leptin-fat mass ratio (r = -0.28, P = .004 and r = - 0.33, P = .0007), thus explaining 38% of the LF variance and 33% of the LF/HF variance. Diastolic blood pressure was also negatively correlated to leptin concentrations (-0.20, P = .04) and to the leptin-fat mass ratio (-0.22, P = .022). In contrast, no consistent correlations between leptin and the time domain components related to vagal activity were observed. At 6 months, after completion of the weight loss program, LF significantly decreased (-7.7% +/- 7.9%, P < .001), whereas HF was higher than the initial value (+20% +/- 5.2%). The leptin-fat mass ratio remained negatively correlated to the LF (r = -0.34, P = .030) and to LF/HF (r = -0.35, P = .021) values, explaining 21% of the LF

  17. Interaction among cardiac, respiratory, and locomotor rhythms during cardiolocomotor synchronization.

    Science.gov (United States)

    Niizeki, K; Kawahara, K; Miyamoto, Y

    1993-10-01

    The nature of entrainment between cardiac and locomotor rhythms was investigated while normal human subjects walked or ran on a treadmill. To detect the incidence of entrainment occurrence, the phase relationships among cardiac, respiratory, and locomotor rhythms were analyzed. The phase relationship between heartbeats and gait signals showed that entrainment of cardiac rhythm to locomotor rhythm occurred in all subjects at one or more treadmill speeds. To elucidate interactions among cardiac, respiratory, and locomotor rhythms during the cardiolocomotor synchronization, spectral and coherence analyses were done for these three rhythms. Spectral and coherence analyses on fluctuations in the heart period and respiratory rhythms revealed that the strength of coupling between cardiac and respiratory rhythms decreased in the presence of cardiolocomotor synchronization. In addition, the coupling of cardiac and locomotor rhythms appeared to induce dissociation of coupling between respiratory and locomotor rhythms. These results were similar to those observed when stepping was voluntarily synchronized with cardiac rhythm. Possible mechanisms to explain coordination and interaction among the neural oscillators innervating these three rhythms are discussed.

  18. Motor activity affects adult skeletal muscle re-innervation acting via tyrosine kinase receptors.

    Science.gov (United States)

    Sartini, Stefano; Bartolini, Fanny; Ambrogini, Patrizia; Betti, Michele; Ciuffoli, Stefano; Lattanzi, Davide; Di Palma, Michael; Cuppini, Riccardo

    2013-05-01

    Recently, muscle expression of brain-derived neurotrophic factor (BDNF) mRNA and protein under activity control has been reported. BDNF is a neurotrophin known to be involved in axon sprouting in the CNS. Hence, we set out to study the effect of chronic treadmill mid-intensity running on adult rat muscle re-innervation, and to explore the involvement of BDNF and tropomyosin-related kinase (Trk) receptors. After nerve crush, muscle re-innervation was evaluated using intracellular recordings, tension recordings, immunostaining and Western blot analyses. An enhanced muscle multiple innervation was found in running rats that was fully reversed to control values blocking Trk receptors or interrupting the running activity. An increase in muscle multiple innervation was also found in sedentary rats treated with a selective TrkB receptor agonist. The expression of TrkB receptors by intramuscular axons was demonstrated, and increased muscle expression of BDNF was found in running animals. The increase in muscle multiple innervation was consistent with the faster muscle re-innervation that we found in running animals. We conclude that, when regenerating axons contact muscle cells, muscle activity progressively increases modulating BDNF and possibly other growth factors, which in turn, acting via Trk receptors, induce axon sprouting to re-innervate skeletal muscle.

  19. Thoracic sympathetic block reduces respiratory system compliance

    Directory of Open Access Journals (Sweden)

    Fábio Ely Martins Benseñor

    Full Text Available CONTEXT AND OBJECTIVE: Thoracic epidural anesthesia (TEA following thoracic surgery presents known analgesic and respiratory benefits. However, intraoperative thoracic sympathetic block may trigger airway hyperreactivity. This study weighed up these beneficial and undesirable effects on intraoperative respiratory mechanics. DESIGN AND SETTING: Randomized, double-blind clinical study at a tertiary public hospital. METHODS: Nineteen patients scheduled for partial lung resection were distributed using a random number table into groups receiving active TEA (15 ml 0.5% bupivacaine, n = 9 or placebo (15 ml 0.9% saline, n = 10 solutions that also contained 1:200,000 epinephrine and 2 mg morphine. Under general anesthesia, flows and airway and esophageal pressures were recorded. Pressure-volume curves, lower inflection points (LIP, resistance and compliance at 10 ml/kg tidal volume were established for respiratory system, chest wall and lungs. Student’s t test was performed, including confidence intervals (CI. RESULTS: Bupivacaine rose 5 ± 1 dermatomes upwards and 6 ± 1 downwards. LIP was higher in the bupivacaine group (6.2 ± 2.3 versus 3.6 ± 0.6 cmH2O, p = 0.016, CI = -3.4 to -1.8. Respiratory system and lung compliance were higher in the placebo group (respectively 73.3 ± 10.6 versus 51.9 ± 15.5, p = 0.003, CI = 19.1 to 23.7; 127.2 ± 31.7 versus 70.2 ± 23.1 ml/cmH2O, p < 0.001, CI = 61 to 53. Resistance and chest wall compliance showed no difference. CONCLUSION: TEA decreased respiratory system compliance by reducing its lung component. Resistance was unaffected. Under TEA, positive end-expiratory pressure and recruitment maneuvers are advisable.

  20. Development of sympathetic ophthalmia following globe injury

    Institute of Scientific and Technical Information of China (English)

    ZHANG Ying; ZHANG Mao-nian; JIANG Cai-hui; YAO Yi

    2009-01-01

    Background Sympathetic ophthalmia (SO), a rare, bilateral, diffuse granulomatous uveitis, usually occurs after open globe injury or intraocular surgery. We sought to identify the risk factors for the development of SO after open globe injury and describe their demographic and clinical features and outcomes of treatments.Methods A retrospective study of inpatients with globe injury in 15 tertiary referral hospitals of China from January 2001 to December 2005 was conducted. The information of demography, nature and mechanism of injury, time and ways of treatments and outcomes was reviewed. Diagnosis of SO was made based on a history of ocular trauma or surgery and subsequent development of bilateral or contralateral uveitis consistent with SO. Any association between related parameters and development of SO was analyzed.Results Among 9103 patients (9776 eyes) of globe injury, SO occurred after open globe injury in 18 cases with an occurrence rate of 0.37%, vitrectomy of closed globe injury in 2 (0.37%) and perforation of burned eyes in another 2. For open globe injury, the median age ((36.72±13.59) years, P=0.01) was higher in patients with SO; there were no significant effects of sexes, injury type, uvea proplaps, once or multi-intraocular surgery, once or multi-vitrectomy and endophthalmitis on incidence of SO; 0.70% endophthalmitis concurred with SO; 83.33% of SO occurred within 1 year after injury or last ocular surgery. SO developed in a fellow eye one week after evisceration of the perforating burned eye. Good final visual acuity was obtained in sympathizing eyes with prompt treatment.Conclusions For open globe injuries, SO sufferers were relatively older and any injury type could induce SO with equal possibility. The initial open globe injury was more likely to be the trigger of SO than subsequent intraocular surgeries including vitrectomy. Prophylactic enucleation after injury is not recommended.

  1. Ontogeny of the serotonergic projection to rat neocortex: transient expression of a dense innervation to primary sensory areas

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    D' Amato, R.J.; Blue, M.E.; Largent, B.L.; Lynch, D.R.; Ledbetter, D.J.; Molliver, M.E.; Snyder, S.H.

    1987-06-01

    The development of serotonergic innervation to rat cerebral cortex was characterized by immunohistochemical localization of serotonin combined with autoradiographic imaging of serotonin-uptake sites. In neonatal rat, a transient, dense, serotonergic innervation appears in all primary sensory areas of cortex. In somatosensory cortex, dense patches of serotonergic innervation are aligned with specialized cellular aggregates called barrels. The dense patches are not apparent after 3 weeks of age, and the serotonergic innervation becomes more uniform in adult neocortex. This precocious neonatal serotonergic innervation may play a transient physiologic role in sensory areas of cortex or may exert a trophic influence on the development of cortical circuitry and thalamocortical connections.

  2. Microinjection of glycine into the hypothalamic paraventricular nucleus produces diuresis, natriuresis, and inhibition of central sympathetic outflow.

    Science.gov (United States)

    Krowicki, Zbigniew K; Kapusta, Daniel R

    2011-04-01

    Strychnine-sensitive glycine receptors and glycine-immunoreactive fibers are expressed in the hypothalamic paraventricular nucleus (PVN), yet the functional significance of this innervation is unclear. Therefore, these studies examined the changes in cardiovascular and renal function and renal sympathetic nerve activity (RSNA) produced by the microinjection of glycine (5 and 50 nmol) into the PVN of conscious Sprague-Dawley rats. Microinjection of glycine into, but not outside of, the PVN dose-dependently increased urine flow rate and urinary sodium excretion and decreased RSNA. At the higher dose, PVN glycine also decreased heart rate; neither 5 nor 50 nmol PVN glycine altered mean arterial pressure. The glycine (50 nmol)-evoked diuresis and natriuresis were abolished in rats continuously infused intravenously with [Arg(8)]-vasopressin. Furthermore, chronic bilateral renal denervation prevented the bradycardia and diuresis to PVN glycine and blunted the natriuresis. In other studies, unilateral PVN pretreatment with the glycine receptor antagonist strychnine (1.6 nmol) prevented the effects of PVN glycine (50 nmol) on heart rate, RSNA, and renal excretory function. When microinjected bilaterally, PVN strychnine (1.6 nmol per site) evoked a significant increase in heart rate and RSNA without altering renal excretory function. These findings demonstrate that in conscious rats glycine acts in the PVN to enhance the renal excretion of water and sodium and decrease central sympathetic outflow to the heart and kidneys. Although endogenous PVN glycine inputs elicit a tonic control of heart rate and RSNA, the renal excretory responses to PVN glycine seem to be caused primarily by the inhibition of arginine vasopressin secretion.

  3. Disappearance and recovery of catecholamine innervation in brain regions of adult goldfish following 6-hydroxydopamine treatment.

    Science.gov (United States)

    Contestabile, A; Friz, T; Caravaggio, M V

    1979-10-01

    The effect of 6-OHDA treatment on catecholamine innervation was studied in the cerebellum, optic tectum and lobus vagi of the goldfish. Catecholamine terminals completely disappeared in less than two weeks after intraventricular injection of 10 microgram 6-OHDA. In periods comprised between 40 days and 4 months after drug injection, catecholamine terminals reappeared to a different degree. The cerebellum showed the highest recovery and, as far as the valvula cerebelli was concerned, also over-innervation. The remarkable power to restore catecholamine innervation led to a distribution of reappearing terminals similar to that of normal animals in the different layers of the three structures examined.

  4. Effect of quinapril or metoprolol on circadian sympathetic and parasympathetic modulation after acute myocardial infarction.

    Science.gov (United States)

    Kontopoulos, A G; Athyros, V G; Papageorgiou, A A; Boudoulas, H

    1999-11-15

    Abnormal autonomic nervous system impairment in patients with acute myocardial infarction (AMI) has a circadian pattern with the greatest manifestation in the morning hours; it probably plays an important role in the pathogenesis of cardiac arrhythmias and acute ischemic syndromes. Angiotensin-converting enzyme inhibitors improve autonomic function in patients with AMI, but the circadian pattern of this effect has not been studied. Heart rate variability-normalized frequency domain indexes were assessed 5 days (baseline) after the onset of uncomplicated AMI and 30 days after therapy with quinapril (n = 30), metoprolol (n = 30), or placebo (n = 30) with a solid-state digital Holter monitor. Normal subjects (n = 30) were used as controls. Quinapril increased parasympathetic and decreased sympathetic modulation, and improved sympathovagal interactions manifested by an increase in normalized high-frequency power (HFP), and a decrease in normalized low-frequency power (LFP), and their ratio (LFP/HFP) during the entire 24-hour period (pMetoprolol increased HFP and decreased LFP and the LFP/HFP ratio mainly between 08.00 A.M. to 12.00 noon, and 19.00 to 22.00 P.M. (delta% ratio -21%, and -12% respectively, pMetoprolol had a similar effect during the late morning and evening hours, but at a lower level. These effects may prove beneficial in reducing cardiac arrhythmias and acute ischemic syndromes in past-AMI patients.

  5. Effects of renal sympathetic nerve radiofrequency ablation on norepinephrine spillover rate and sympathetic nerve activity in dogs with hypertension

    Directory of Open Access Journals (Sweden)

    Hang YU

    2012-11-01

    Full Text Available Objective  To evaluate the validity and explore the mechanism of renal sympathetic denervation (RSD in the treatment of dogs with hypertension reproduced by constriction of abdominal aorta. Methods  The hypertension model was reproduced by constriction of abdominal aorta in 20 adult healthy dogs. These dogs were then randomly divided into the treatment group and control group (10 each. Renal sympathetic nerve radiofrequency ablation was done in treatment group 1 month after modeling. The foreleg blood pressure, sympathetic activity and norepinephrine overflow rate of dogs in two groups were detected before modeling, and 1, 2 and 3 months after modeling, and the trend of the change was also observed. Results  One month after modeling, the systolic blood pressure (SBP, diastolic blood pressure (DBP and mean arterial blood pressure (MAP were elevated significantly in control group (146.7±21.0, 89.0±12.7 and 108.3±14.9mmHg compared with those before modeling (119.5±13.2, 76.5±7.8 and 90.9±8mmHg, P < 0.05. The renal sympathetic activity impulse and norepinephrine spillover rate were also enhanced significantly (P < 0.05. The renal sympathetic nerve activity obviously decreased in the treatment group after the operation, and then increased 2 months after the ablation. The norepinephrine spillover rate in treatment group increased significantly 1 month after modeling (P < 0.05, and decreased after ablation, and it lasted to the end of the experiment (P < 0.05. One and two months after ablation, the norepinephrine spillover rate was lower in treatment group than in control group (P < 0.05. Conclusion  Renal sympathetic nerve radiofrequency ablation significantly inhibits the elevation of norepinephrine spillover rate and sympathetic nerve activity in dogs with hypertension.

  6. Matured Hop Bittering Components Induce Thermogenesis in Brown Adipose Tissue via Sympathetic Nerve Activity.

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    Yumie Morimoto-Kobayashi

    Full Text Available Obesity is the principal symptom of metabolic syndrome, which refers to a group of risk factors that increase the likelihood of atherosclerosis. In recent decades there has been a sharp rise in the incidence of obesity throughout the developed world. Iso-α-acids, the bitter compounds derived from hops in beer, have been shown to prevent diet-induced obesity by increasing lipid oxidation in the liver and inhibition of lipid absorption from the intestine. Whereas the sharp bitterness induced by effective dose of iso-α-acids precludes their acceptance as a nutrient, matured hop bittering components (MHB appear to be more agreeable. Therefore, we tested MHB for an effect on ameliorating diet-induced body fat accumulation in rodents. MHB ingestion had a beneficial effect but, compared to iso-α-acids and despite containing structurally similar compounds, acted via different mechanisms to reduce body fat accumulation. MHB supplementation significantly reduced body weight gain, epididymal white adipose tissue weight, and plasma non-esterified free fatty acid levels in diet-induced obese mice. We also found that uncoupling protein 1 (UCP1 expression in brown adipose tissue (BAT was significantly increased in MHB-fed mice at both the mRNA and protein levels. In addition, MHB administration in rats induced the β-adrenergic signaling cascade, which is related to cAMP accumulation in BAT, suggesting that MHB could modulate sympathetic nerve activity innervating BAT (BAT-SNA. Indeed, single oral administration of MHB elevated BAT-SNA in rats, and this elevation was dissipated by subdiaphragmatic vagotomy. Single oral administration of MHB maintained BAT temperature at a significantly higher level than in control rats. Taken together, these findings indicate that MHB ameliorates diet-induced body fat accumulation, at least partly, by enhancing thermogenesis in BAT via BAT-SNA activation. Our data suggests that MHB is a useful tool for developing functional

  7. Cardiac Calcification

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    Morteza Joorabian

    2011-05-01

    Full Text Available There is a spectrum of different types of cardiac"ncalcifications with the importance and significance"nof each type of cardiac calcification, especially"ncoronary artery calcification. Radiologic detection of"ncalcifications within the heart is quite common. The"namount of coronary artery calcification correlates"nwith the severity of coronary artery disease (CAD."nCalcification of the aortic or mitral valve may indicate"nhemodynamically significant valvular stenosis."nMyocardial calcification is a sign of prior infarction,"nwhile pericardial calcification is strongly associated"nwith constrictive pericarditis. A spectrum of different"ntypes of cardiac calcifications (linear, annular,"ncurvilinear,... could be seen in chest radiography and"nother imaging modalities. So a carful inspection for"ndetection and reorganization of these calcifications"nshould be necessary. Numerous modalities exist for"nidentifying coronary calcification, including plain"nradiography, fluoroscopy, intravascular ultrasound,"nMRI, echocardiography, and conventional, helical and"nelectron-beam CT (EBCT. Coronary calcifications"ndetected on EBCT or helical CT can be quantifie,"nand a total calcification score (Cardiac Calcification"nScoring may be calculated. In an asymptomatic"npopulation and/or patients with concomitant risk"nfactors like diabetes mellitus, determination of the"npresence of coronary calcifications identifies the"npatients at risk for future myocardial infarction and"ncoronary artery disease. In patients without coronary"ncalcifications, future cardiovascular events could"nbe excluded. Therefore, detecting and recognizing"ncalcification related to the heart on chest radiography"nand other imaging modalities such as fluoroscopy, CT"nand echocardiography may have important clinical"nimplications.

  8. [A pharmacological analysis of the central control of the preganglionic sympathetic neurons during stimulation of the afferent nerve fibers of the digestive tract].

    Science.gov (United States)

    Itina, L V; Posniak, V A

    1995-12-01

    In acute experiments on cats, effect of adrenergic brain neurons on impulse activity of preganglionic fibers of the left splanchnic nerve was studied. Afferent fibers of nerves innervating the stomach, duodenum, ileum and ileocecal angle were electrically stimulated. Phenoxybenzamine, obsidan, amizyl, iprazid, nuredal, dalargine, and morphine were used for pharmacological analysis. Nerves, stimulation at 20 Hz of different segments of the digestive tract was accompanied by different inhibition of preganglionic neurons. Sympathetic-stimulating effects were observed more frequently at 5 Hz stimulation. After vagotomy, alpha- and beta-adrenoreceptor block, central cholinoreceptor and monoamine oxidase (MAO) block, and after dalargine (0.1 and 0.01 mg/kg) nerves stimulation at 20 Hz was followed by sympathetic-stimulating effect. A weak regulatory effect of morphine (1 and 10 mg/kg) on ileal nerve stimulation effects was shown. It is suggested that excitation from afferent neurons of the vagus is transmitted to central cholinergic neurons which, in their turn, excite adrenergic neurons of the brain, and the latter inhibit impulsation of preganglionic fibers. MAO block increased the balance of excitatory effect of serotonin on spinal reflexes. Morphine and dalargine intracentrally may block adrenergic and cholinergic transmissions, as well as decrease the release of substance P from afferent neurons. Their regulatory action is revealed when different frequencies of stimulation are used.

  9. Propranolol for Paroxysmal Sympathetic Hyperactivity with Lateralizing Hyperhidrosis after Stroke

    Directory of Open Access Journals (Sweden)

    Jason W. Siefferman

    2015-01-01

    Full Text Available Brain injury can lead to impaired cortical inhibition of the hypothalamus, resulting in increased sympathetic nervous system activation. Symptoms of paroxysmal sympathetic hyperactivity may include hyperthermia, tachycardia, tachypnea, vasodilation, and hyperhidrosis. We report the case of a 41-year-old man who suffered from a left middle cerebral artery stroke and subsequently developed central fever, contralateral temperature change, and hyperhidrosis. His symptoms abated with low-dose propranolol and then returned upon discontinuation. Restarting propranolol again stopped his symptoms. This represents the first report of propranolol being used for unilateral dysautonomia after stroke. Propranolol is a lipophilic nonselective beta-blocker which easily crosses the blood-brain barrier and may be used to treat paroxysmal sympathetic hyperactivity.

  10. Leptin as a mediator between obesity and cardiac dysfunction

    Directory of Open Access Journals (Sweden)

    Joanna Karbowska

    2012-05-01

    Full Text Available  Obesity is now recognised as one of the most important risk factors for heart disease. Obese individuals have high circulating levels of leptin, a hormone secreted by adipose tissue and in­volved in energy homeostasis. Growing evidence suggests that leptin may contribute to the development of cardiac dysfunction. In a large prospective study leptin has been shown to be an independent risk factor for coronary heart disease. An independent positive association has also been found between plasma leptin levels and heart rate in hypertensive patients and heart transplant recipients. In animal studies chronic leptin infusion increased heart rate and blood pressure. It has also been demonstrated that circulating leptin levels are elevated in patients with heart failure. The level of plasma leptin was associated with increased myocardial wall thickness and correlated with left ventricular mass, suggesting a role for this hormone in mediating left ventricular hypertrophy in humans. Moreover, leptin directly induced hypertrophy and hyperplasia in human and rodent cardiomyocytes, accompanied by cardiac extracellular matrix remodelling. Leptin may also influence energy substrate utilisation in cardiac tissue.These findings suggest that leptin acting directly or through the sympathetic nervous system may have adverse effects on cardiac structure and function, and that chronic hyperleptinaemia may greatly increase the risk of cardiac disorders. Additional studies are needed to define the role of leptin in cardiac physiology and pathophysiology, nevertheless the reduction in plasma leptin levels with caloric restriction and weight loss may prevent cardiac dysfunction in obese patients.

  11. Systematic morphology and evolutionary anatomy of the autonomic cardiac nervous system in the lesser apes, gibbons (hylobatidae).

    Science.gov (United States)

    Kawashima, Tomokazu; Thorington, Richard W; Kunimatsu, Yutaka; Whatton, James F

    2008-08-01

    We examined the morphology of the autonomic cardiac nervous system (ACNS) on 20 sides of 10 gibbons (Hylobatidae) of three genera, and we have inferred the evolution of the anatomy of the primate ACNS. We report the following. (1) Several trivial intraspecific and interspecific variations are present in gibbons, but the general arrangement of the ACNS in gibbons is consistent. (2) Although the parasympathetic vagal cardiac nervous system is extremely consistent, the sympathetic cardiac nervous system, such as the composition of the sympathetic ganglia and the range of origin of the sympathetic cardiac nerves, exhibit topographical differences among primates. (3) The vertebral ganglion, seldom observed in the Old World monkeys (Cercopithecidae), was consistently present in gibbons as well as in humans. (4) There are fewer thoracic ganglia contributing to the cervicothoracic ganglion in humans than in gibbons and in gibbons than in Old World monkeys. (5) The superior cardiac nerve originating from the superior cervical ganglion, rarely observed in Old World monkeys but commonly observed in humans, was present in 13 of 20 sides (65%), mostly on the left. Accordingly, the ACNS morphology exhibits evolutionary changes within the primate lineage. These evolutionary differences between Old World monkeys, gibbons, and humans are most parsimoniously interpreted as resulting from regular changes in the lineages leading from their common ancestor to the extant species that we dissected. They include the reduction in the number of thoracic ganglia contributing to the cervicothoracic ganglion and the expansion of the range of the cardiac nervous origin.

  12. Role of sympathetic nervous system and neuropeptides in obesity hypertension

    Directory of Open Access Journals (Sweden)

    J.E. Hall

    2000-06-01

    Full Text Available Obesity is the most common cause of human essential hypertension in most industrialized countries. Although the precise mechanisms of obesity hypertension are not fully understood, considerable evidence suggests that excess renal sodium reabsorption and a hypertensive shift of pressure natriuresis play a major role. Sympathetic activation appears to mediate at least part of the obesity-induced sodium retention and hypertension since adrenergic blockade or renal denervation markedly attenuates these changes. Recent observations suggest that leptin and its multiple interactions with neuropeptides in the hypothalamus may link excess weight gain with increased sympathetic activity. Leptin is produced mainly in adipocytes and is believed to regulate energy balance by acting on the hypothalamus to reduce food intake and to increase energy expenditure via sympathetic activation. Short-term administration of leptin into the cerebral ventricles increases renal sympathetic activity, and long-term leptin infusion at rates that mimic plasma concentrations found in obesity raises arterial pressure and heart rate via adrenergic activation in non-obese rodents. Transgenic mice overexpressing leptin also develop hypertension. Acute studies suggest that the renal sympathetic effects of leptin may depend on interactions with other neurochemical pathways in the hypothalamus, including the melanocortin-4 receptor (MC4-R. However, the role of this pathway in mediating the long-term effects of leptin on blood pressure is unclear. Also, it is uncertain whether there is resistance to the chronic renal sympathetic and blood pressure effects of leptin in obese subjects. In addition, leptin also has other cardiovascular and renal actions, such as stimulation of nitric oxide formation and improvement of insulin sensitivity, which may tend to reduce blood pressure in some conditions. Although the role of these mechanisms in human obesity has not been elucidated, this

  13. Hippocampal CA3 pyramidal cells selectively innervate aspiny interneurons.

    Science.gov (United States)

    Wittner, Lucia; Henze, Darrell A; Záborszky, László; Buzsáki, György

    2006-09-01

    The specific connectivity among principal cells and interneurons determines the flow of activity in neuronal networks. To elucidate the connections between hippocampal principal cells and various classes of interneurons, CA3 pyramidal cells were intracellularly labelled with biocytin in anaesthetized rats and the three-dimensional distribution of their axon collaterals was reconstructed. The sections were double-stained for substance P receptor (SPR)- or metabotropic glutamate receptor 1alpha (mGluR-1alpha)-immunoreactivity to investigate interneuron targets of the CA3 pyramidal cells. SPR-containing interneurons represent a large portion of the GABAergic population, including spiny and aspiny classes. Axon terminals of CA3 pyramidal cells contacted SPR-positive interneuron dendrites in the hilus and in all hippocampal strata in both CA3 and CA1 regions (7.16% of all boutons). The majority of axons formed single contacts (87.5%), but multiple contacts (up to six) on single target neurons were also found. CA3 pyramidal cell axon collaterals innervated several types of morphologically different aspiny SPR-positive interneurons. In contrast, spiny SPR-interneurons or mGluR-1alpha-positive interneurons in the hilus, CA3 and CA1 regions were rarely contacted by the filled pyramidal cells. These findings indicate a strong target selection of CA3 pyramidal cells favouring the activation of aspiny classes of interneurons.

  14. Sympathetic Vasoconstrictor Responsiveness of the Leg Vasculature During Experimental Endotoxemia and Hypoxia in Humans

    DEFF Research Database (Denmark)

    Brassard, Patrice; Zaar, Morten; Thaning, Pia;

    2016-01-01

    OBJECTIVE: Sympathetic vasoconstriction regulates peripheral circulation and controls blood pressure, but sepsis is associated with hypotension. We evaluated whether apparent loss of sympathetic vasoconstrictor responsiveness relates to distended smooth muscles or to endotoxemia and/or hypoxia...

  15. Central and cerebrovascular effects of leg crossing in humans with sympathetic failure

    NARCIS (Netherlands)

    M.P. Harms; W. Wieling; W.N. Colier; J.W. Lenders; N.H. Secher; J.J. van Lieshout

    2010-01-01

    Leg crossing increases arterial pressure and combats symptomatic orthostatic hypotension in patients with sympathetic failure This study compared the central and cerebrovascular effects of leg crossing in patients with sympathetic failure and healthy controls. We addressed the relationship between M

  16. Innervation of the elbow joint: Is total denervation possible? A cadaveric anatomic study.

    Science.gov (United States)

    De Kesel, Renata; Van Glabbeek, Francis; Mugenzi, Dominique; De Vos, Joris; Vermeulen, Katrien; Van Renterghem, Debbie; Bortier, Hilde; Schuind, Frédéric

    2012-09-01

    The aim of this anatomical study was to find out if total denervation of the elbow joint is technically feasible. The endbranches of the brachial plexus of eight fresh-frozen upper arm cadavers were dissected with optical loupe magnification. All major nerves of the upper limb (except the axillary and the medial brachial cutaneous nerve) give some terminal articular endbranches to the elbow. The articular endbranches arise from muscular endbranches, cutaneous endbranches, or arise straight from the main nerves of the brachial plexus. A topographic diagram was made of the different nerves innervating the elbow joint. The ulno-posterior part of the elbow is innervated by the ulnar nerve and some branches of medial antebrachial cutaneous nerve. The radial-posterior part of the elbow is innervated exclusively by the radial nerve. The ulno-anterior part of the elbow is innervated by the median nerve and the musculocutaneous nerve. The radio-anterior part of the elbow is innervated by the radial nerve and the musculocutaneous nerve. These elbow innervation findings are relevant to both anatomical and clinical field as they provide evidence that the total denervation of the elbow joint is impossible. Nevertheless, partial denervation, like denervation of the lateral epicondyle or the ulnar part of elbow, is technically possible.

  17. Dense and overlapping innervation of pyramidal neurons by neocortical chandelier cells

    Science.gov (United States)

    Inan, Melis; Blázquez-Llorca, Lidia; Merchán-Perez, Angel; Anderson, Stewart A.; DeFelipe, Javier; Yuste, Rafael

    2013-01-01

    Chandelier (or axo-axonic) cells are a distinct group of GABAergic interneurons that innervate the axon initial segments of pyramidal cells and thus could have an important role controlling the activity of cortical circuits. To understand their connectivity we labeled upper layers chandelier cells (ChCs) from mouse neocortex with a genetic strategy and studied how their axons contact local populations of pyramidal neurons, using immunohistochemical detection of axon initial segments. We studied ChCs located in the border of layers 1 and 2 from primary somatosensory cortex and find that practically all ChC axon terminals contact axon initial segments with an average of 3–5 boutons per cartridge. By measuring the number of putative synapses in initial segments we estimate that each pyramidal neuron is innervated, on average, by at least 4 ChCs. Additionally, each individual ChC contacts 35–50% of pyramidal neurons within its axonal arbor, with pockets of high innervation density. Finally, we find that ChC axons seems to have a conserved innervation pattern at different postnatal ages (P18–90), with only relatively small lateral expansions of their arbor and increases in the total number of their cartridges during the developmental period analyzed. We conclude that ChCs innervate neighboring pyramidal neurons in a dense and overlapping manner, an innervation pattern which could enable ChCs exert a widespread influence on their local circuits. PMID:23365230

  18. Central nervous system neuropeptide Y regulates mediators of hepatic phospholipid remodeling and very low-density lipoprotein triglyceride secretion via sympathetic innervation

    NARCIS (Netherlands)

    Rojas, Jennifer M; Bruinstroop, E.; Printz, Richard L; Alijagic-Boers, Aldijana; Foppen, E.; Turney, Maxine K; George, Leena; Beck-Sickinger, Annette G; Kalsbeek, A.; Niswender, Kevin D

    2015-01-01

    OBJECTIVE: Elevated very low-density lipoprotein (VLDL)-triglyceride (TG) secretion from the liver contributes to an atherogenic dyslipidemia that is associated with obesity, diabetes and the metabolic syndrome. Numerous models of obesity and diabetes are characterized by increased central nervous s

  19. A comparison of sympathetic and conventional training methods on responses to initial horse training

    NARCIS (Netherlands)

    Visser, E.K.; Dierendonck, van M.; Ellis, A.D.; Rijksen, C.; Reenen, van C.G.

    2009-01-01

    In `sympathetic horsemanship¿ the importance of the natural behaviour of the horse and the use of body language in communication is emphasised. However, it is unclear what effect sympathetic horsemanship has on the welfare of horses. During a 5-week starting period the effect of a sympathetic (ST) v

  20. Effect of sympathetic nerve block on acute inflammatory pain and hyperalgesia

    DEFF Research Database (Denmark)

    Pedersen, J L; Rung, G W; Kehlet, H

    1997-01-01

    BACKGROUND: Sympathetic nerve blocks relieve pain in certain chronic pain states, but the role of the sympathetic pathways in acute pain is unclear. Thus the authors wanted to determine whether a sympathetic block could reduce acute pain and hyperalgesia after a heat injury in healthy volunteers....

  1. Influence of central inhibition of sympathetic nervous activity on myocardial metabolism in chronic heart failure: acute effects of the imidazoline I1-receptor agonist moxonidine.

    Science.gov (United States)

    Mobini, Reza; Fu, Michael; Jansson, Per-Anders; Bergh, Claes-Håkan; Scharin Täng, Margareta; Waagstein, Finn; Andersson, Bert

    2006-03-01

    Although beta-adrenergic blockade is beneficial in heart failure, inhibition of central sympathetic outflow using moxonidine has been associated with increased mortality. In the present study, we studied the acute effects of the imidazoline-receptor agonist moxonidine on haemodynamics, NA (noradrenaline) kinetics and myocardial metabolism. Fifteen patients with CHF (chronic heart failure) were randomized to a single dose of 0.6 mg of sustained-release moxonidine or matching placebo. Haemodynamics, NA kinetics and myocardial metabolism were studied over a 2.5 h time period. There was a significant reduction in pulmonary and systemic arterial pressures, together with a decrease in cardiac index in the moxonidine group. Furthermore, there was a simultaneous reduction in systemic and cardiac net spillover of NA in the moxonidine group. Analysis of myocardial consumption of substrates in the moxonidine group showed a significant increase in non-esterified fatty acid consumption and a possible trend towards an increase in myocardial oxygen consumption compared with the placebo group (P=0.16). We conclude that a single dose of moxonidine (0.6 mg) in patients already treated with a beta-blocker reduced cardiac and overall sympathetic activity. The finding of increased lipid consumption without decreased myocardial oxygen consumption indicates a lack of positive effects on myocardial metabolism under these conditions. We suggest this might be a reason for the failure of moxonidine to prevent deaths in long-term studies in CHF.

  2. Computer-based analysis of cardiac state using entropies, recurrence plots and Poincare geometry.

    Science.gov (United States)

    Chua, K C; Chandran, V; Acharya, U R; Lim, C M

    2008-01-01

    Heart rate variability refers to the regulation of the sinoatrial node, the natural pacemaker of the heart by the sympathetic and parasympathetic branches of the autonomic nervous system. Heart rate variability is important because it provides a window to observe the heart's ability to respond to normal regulatory impulses that affect its rhythm. A computer-based intelligent system for analysis of cardiac states is very useful in diagnostics and disease management. Parameters are extracted from the heart rate signals and analysed using computers for diagnostics. This paper describes the analysis of normal and seven types of cardiac abnormal signals using approximate entropy (ApEn), sample entropy (SampEn), recurrence plots and Poincare plot patterns. Ranges of these parameters for various cardiac abnormalities are presented with an accuracy of more than 95%. Among the two entropies, ApEn showed better performance for all the cardiac abnormalities. Typical Poincare and recurrence plots are shown for various cardiac abnormalities.

  3. Sensory innervation of the hairy skin (light- and electronmicroscopic study.

    Science.gov (United States)

    Halata, Z

    1993-07-01

    The sense of touch develops early in phylogeny and is one of the most important senses for the survival of the animal. Touch organs of hairy skin in mammals include the so-called "Haarscheiben" (also Pinkus corpuscles) and all types of hair follicles with their nerve endings. The touch organs of the skin consist of a mechanical transducing component and the sensory component. The epithelium and its derivatives like hair follicles and sebaceous glands are the mechanical transducing component transmitting the mechanical forces like pressure or touch to the second component--the sensory nerve endings. In mammalian hairy skin all sinus and guard hairs and many vellus hairs are touch organs. The sinus hair is a typical example of a touch organ. All mammals except humans are equipped with these highly differentiated touch organs. The hair follicle is almost completely embedded in a blood sinus and equipped with more than 2,000 sensory nerve endings. All sinus and guard hairs are equipped with free nerve endings (nociceptors), Merkel nerve endings (slowly adapting [SA I] mechanoreceptor units-pressure detectors), palisades of lanceolate nerve endings (velocity detectors), and pilo-Ruffini corpuscles (tension receptors). In most of the sinus hairs lamellated corpuscles of Pacini type could be found (rapidly adapting receptors-acceleration detectors). Most vellus hairs are equipped with free and lanceolate nerve endings. Some of the vellus hairs of the upper portion of the body (head, upper extremity) are innervated by Merkel nerve endings. The presence of pilo-Ruffini nerve endings in vellus hairs is very unusual.

  4. Sympathetically evoked Ca2+ signaling in arterial smooth muscle

    Institute of Scientific and Technical Information of China (English)

    Wei-jin ZANG; Joseph ZACHARIA; Christine LAMONT; Withrow Gil WIER

    2006-01-01

    The sympathetic nervous system plays an essential role in the control of total peripheral vascular resistance and blood flow, by controlling the contraction of small arteries. Perivascular sympathetic nerves release ATP, norepinephrine (NE) and neuropeptide Y. This review summarizes our knowledge of the intracellular Ca2+ signals that are activated by ATP and NE, acting respectively on P2X1 and α1 adrenoceptors in arterial smooth muscle. Each neurotransmitter produces a unique type of post-synaptic Ca2+ signal and associated contraction. The neural release of ATP and NE is thought to vary markedly with the pattern of nerve activity, probably reflecting both pre- and post-synaptic mechanisms. Finally, we show that Ca2+ signaling during neurogenic contractions activated by trains of sympathetic nerve fiber action potentials are in fact significantly different from that elicited by simple bath application of exogenous neurotransmitters to isolated arteries (a common experimental technique), and end by identifying important questions remaining in our understanding of sympathetic neurotransmission and the physiological regulation of contraction of small arteries.

  5. Morphine-sensitive paroxysmal sympathetic storm in pontine intracerebral hemorrhage.

    Science.gov (United States)

    Ko, Sang-Bae; Kim, Chi Kyung; Lee, Seung-Hoon; Bae, Hee-Joon; Yoon, Byung-Woo

    2010-11-01

    Paroxysmal sympathetic storm (PSS) is a rare complication of severe traumatic brain injury or cerebrovascular disease. Various medications have been tried in patients with PSS, but the clinical responses of the patients were variable. We report a classic case of PSS after spontaneous pontine hemorrhage in which the patient's fluctuating blood pressure and body temperature were dramatically stabilized using morphine.

  6. Prolonged Paroxysmal Sympathetic Storming Associated with Spontaneous Subarachnoid Hemorrhage

    Directory of Open Access Journals (Sweden)

    Yan Liu

    2013-01-01

    Full Text Available Paroxysmal sympathetic storming (PSS is a rare disorder characterized by acute onset of nonstimulated tachycardia, hypertension, tachypnea, hyperthermia, external posturing, and diaphoresis. It is most frequently associated with severe traumatic brain injuries and has been reported in intracranial tumors, hydrocephalous, severe hypoxic brain injury, and intracerebral hemorrhage. Although excessive release of catecholamine and therefore increased sympathetic activities have been reported in subarachnoid hemorrhage (SAH, there is no descriptive report of PSS primarily caused by spontaneous SAH up to date. Here, we report a case of prolonged PSS in a patient with spontaneous subarachnoid hemorrhage and consequent vasospasm. The sympathetic storming started shortly after patient was rewarmed from hypothermia protocol and symptoms responded to Labetalol, but intermittent recurrence did not resolve until 3 weeks later with treatment involving Midazolam, Fentanyl, Dexmedetomidine, Propofol, Bromocriptine, and minimizing frequency of neurological and vital checks. In conclusion, prolonged sympathetic storming can also be caused by spontaneous SAH. In this case, vasospasm might be a precipitating factor. Paralytics and hypothermia could mask the manifestations of PSS. The treatment of the refractory case will need both timely adjustment of medications and minimization of exogenous stressors or stimuli.

  7. Baroreflex control of sympathetic activity in experimental hypertension

    Directory of Open Access Journals (Sweden)

    M.C.C. Irigoyen

    1998-09-01

    Full Text Available The arterial baroreceptor reflex system is one of the most powerful and rapidly acting mechanisms for controlling arterial pressure. The purpose of the present review is to discuss data relating sympathetic activity to the baroreflex control of arterial pressure in two different experimental models: neurogenic hypertension by sinoaortic denervation (SAD and high-renin hypertension by total aortic ligation between the renal arteries in the rat. SAD depresses baroreflex regulation of renal sympathetic activity in both the acute and chronic phases. However, increased sympathetic activity (100% was found only in the acute phase of sinoaortic denervation. In the chronic phase of SAD average discharge normalized but the pattern of discharges was different from that found in controls. High-renin hypertensive rats showed overactivity of the renin angiotensin system and a great depression of the baroreflexes, comparable to the depression observed in chronic sinoaortic denervated rats. However, there were no differences in the average tonic sympathetic activity or changes in the pattern of discharges in high-renin rats. We suggest that the difference in the pattern of discharges may contribute to the increase in arterial pressure lability observed in chronic sinoaortic denervated rats.

  8. Causes and consequences of increased sympathetic activity in renal disease

    NARCIS (Netherlands)

    Joles, JA; Koomans, HA

    2004-01-01

    Much evidence indicates increased sympathetic nervous activity (SNA) in renal disease. Renal ischemia is probably a primary event leading to increased SNA. Increased SNA often occurs in association with hypertension. However, the deleterious effect of increased SNA on the diseased kidney is not only

  9. Cardiac arrest after anesthetic management in a patient with hereditary sensory autonomic neuropathy type IV

    Directory of Open Access Journals (Sweden)

    Ergül Yakup

    2011-01-01

    Full Text Available Hereditary sensory autonomic neuropathy type IV is a rare disorder with an autosomal recessive transmission and characterized by self-mutilation due to a lack in pain and heat sensation. Recurrent hyperpyrexia and anhydrosis are seen in patients as a result of a lack of sweat gland innervation. Self-mutilation and insensitivity to pain result in orthopedic complications and patients undergone recurrent surgical interventions with anesthesia. However, these patients are prone to perioperative complications such as hyperthermia, hypothermia, and cardiac complications like bradycardia and hypotension. We report a 5-year-old boy with hereditary sensory autonomic neuropathy type IV, developing hyperpyrexia and cardiac arrest after anesthesia.

  10. Relationship between left ventricular diastolic function and myocardial sympathetic denervation measured by {sup 123}I-meta-iodobenzylguanidine imaging in Anderson-Fabry disease

    Energy Technology Data Exchange (ETDEWEB)

    Spinelli, Letizia; Giudice, Caterina Anna; Imbriaco, Massimo; Trimarco, Bruno; Cuocolo, Alberto [University Federico II, Department of Advanced Biomedical Sciences, Naples (Italy); Pellegrino, Teresa [Institute of Biostructure and Bioimaging, National Council of Research, Naples (Italy); Pisani, Antonio; Riccio, Eleonora [University Federico II, Department of Public Health, Naples (Italy); Salvatore, Marco [IRCCS SDN, Naples (Italy)

    2016-04-15

    Whether cardiac sympathetic nervous function abnormalities may be present in patients with Anderson-Fabry disease (AFD) remains unexplored. We investigated the relationship between left ventricular (LV) function and cardiac sympathetic nervous function in patients with AFD. Twenty-five patients (12 men, mean age 43 ± 13 years) with genetically proved AFD and preserved LV ejection fraction and ten age and gender-matched control subjects underwent speckle tracking echocardiography and {sup 123}I-meta-iodobenzylguanidine (MIBG) imaging from which early and late heart to mediastinum (H/M) ratios and myocardial washout rate values were calculated. In AFD patients, a significant correlation between late H/M ratio and LV mass index (r = -61, p = 0.001), left atrial volume (r = -0.72, p < 0.001), systolic pulmonary artery pressure (r = -0.75, p < 0.001), and early diastolic untwisting rate (r = -0.66, p < 0.001) was found. Ten AFD patients exhibited a late H/M ratio below two fold standard deviation of control subjects (≤1.75). Patients showing late H/M ratio ≤ 1.75 had significantly higher LV mass index, relative wall thickness, left atrial volume and systolic pulmonary artery pressure, lower systolic longitudinal strain and an early diastolic untwisting rate compared to patients with late H/M ratio > 1.75. At multivariable linear regression analysis, early diastolic untwisting rate was the only independent predictor of late H/M ratio ≤ 1.75 (odds ratio 1.15, 95 % confidence interval 1.07-1.31, p < 0.05). The present findings provide the first demonstration of a cardiac sympathetic derangement in AFD patients with preserved LV ejection fraction, which is mostly related to LV diastolic dysfunction. (orig.)

  11. 晚钠电流的魅影--从交感性 T 波到Takotsubo 综合征%The appearance of late sodium current:from sympathetic T wave to Takotsubo syndrome

    Institute of Scientific and Technical Information of China (English)

    贾忠伟

    2016-01-01

    Sympathetic T wave is a kind of cardiac electrophysiological abnormality related to sympathetic stress.Besides cardiac electrophysiological abnormalities,Takotsubo syndrome includes cardiac mechanical dysfunction.They share the same pathogenesis including sympathetic excitation, late sodium current (ⅠNaL )and electrophysiological abnormalities of myocardial cell mediated by calmodulin,etc.However,they may be different clinical manifestations of the same disease.%交感性 T 波是一类与交感应激有关的心脏电生理异常,而 Takotsubo 综合征包含了心电生理异常和心脏机械功能异常两方面。二者有共同的发病机制,包括交感兴奋、晚钠电流(late sodium current,ⅠNaL )及钙调蛋白介导的心肌细胞电生理异常等。它们可能是同一种疾病不同的临床表现形式。

  12. Succinate dehydrogenase activity and soma size of motoneurons innervating different portions of the rat tibialis anterior

    Science.gov (United States)

    Ishihara, A.; Roy, R. R.; Edgerton, V. R.

    1995-01-01

    The spatial distribution, soma size and oxidative enzyme activity of gamma and alpha motoneurons innervating muscle fibres in the deep (away from the surface of the muscle) and superficial (close to the surface of the muscle) portions of the tibialis anterior in normal rats were determined. The deep portion had a higher percentage of high oxidative fibres than the superficial portion of the muscle. Motoneurons were labelled by retrograde neuronal transport of fluorescent tracers: Fast Blue and Nuclear Yellow were injected into the deep portion and Nuclear Yellow into the superficial portion of the muscle. Therefore, motoneurons innervating the deep portion were identified by both a blue fluorescent cytoplasm and a golden-yellow fluorescent nucleus, while motoneurons innervating the superficial portion were identified by only a golden-yellow fluorescent nucleus. After staining for succinate dehydrogenase activity on the same section used for the identification of the motoneurons, soma size and succinate dehydrogenase activity of the motoneurons were measured. The gamma and alpha motoneurons innervating both the deep and superficial portions were located primarily at L4 and were intermingled within the same region of the dorsolateral portion of the ventral horn in the spinal cord. Mean soma size was similar for either gamma or alpha motoneurons in the two portions of the muscle. The alpha motoneurons innervating the superficial portion had a lower mean succinate dehydrogenase activity than those innervating the deep portion of the muscle. An inverse relationship between soma size and succinate dehydrogenase activity of alpha, but not gamma, motoneurons innervating both the deep and superficial portions was observed. Based on three-dimensional reconstructions within the spinal cord, there were no apparent differences in the spatial distribution of the motoneurons, either gamma or alpha, associated with the deep and superficial compartments of the muscle. The data

  13. Ontogeny of the serotonergic projection to rat neocortex: transient expression of a dense innervation to primary sensory areas.

    OpenAIRE

    D'Amato, R J; Blue, M E; Largent, B L; Lynch, D R; Ledbetter, D J; Molliver, M E; Snyder, S H

    1987-01-01

    The development of serotonergic innervation to rat cerebral cortex was characterized by immunohistochemical localization of serotonin combined with autoradiographic imaging of serotonin-uptake sites. In neonatal rat, a transient, dense, serotonergic innervation appears in all primary sensory areas of cortex. In somatosensory cortex, dense patches of serotonergic innervation are aligned with specialized cellular aggregates called barrels. The dense patches are not apparent after 3 weeks of age...

  14. Motor imagery muscle contraction strength influences spinal motor neuron excitability and cardiac sympathetic nerve activity

    OpenAIRE

    2015-01-01

    [Purpose] The aim of this study was to investigate the changes in spinal motor neuron excitability and autonomic nervous system activity during motor imagery of isometric thenar muscle activity at 10% and 50% maximal voluntary contraction (MVC). [Methods] The F-waves and low frequency/high frequency (LF/HF) ratio were recorded at rest, during motor imagery, and post-trial. For motor imagery trials, subjects were instructed to imagine thenar muscle activity at 10% and 50% MVC while holding the...

  15. Cardiac MRI in Athletes

    NARCIS (Netherlands)

    Luijkx, T.

    2012-01-01

    Cardiac magnetic resonance imaging (CMR) is often used in athletes to image cardiac anatomy and function and is increasingly requested in the context of screening for pathology that can cause sudden cardiac death (SCD). In this thesis, patterns of cardiac adaptation to sports are investigated with C

  16. P2 receptors in the central and peripheral nervous systems modulating sympathetic vasomotor tone.

    Science.gov (United States)

    Ralevic, V

    2000-07-01

    Arterial pressure depends on the level of activity of sympathetic vasoconstrictor outflow to blood vessels. This activity is generated in the central nervous system, and involves inputs from a variety of brain regions projecting to sympathetic preganglionic neurones. Of especial interest are a group of neurones in the rostral ventrolateral medulla (RVLM), as they have been demonstrated to have a fundamental role in reflex regulation of the cardiovascular system, and in generation of tonic drive to sympathetic outflow. Sympathetic outflow to blood vessels is additionally modulated at sympathetic ganglia, and at the peripheral terminals of sympathetic nerves. This review considers the role of P2 purine receptors in this neural pathway. Ionotropic P2X receptors are expressed in the RVLM, in sympathetic ganglia, and at the sympathetic neuromuscular junction, and mediate fast excitatory neurotransmission, indicating a general role for ATP as a regulator of sympathetic vasomotor tone. P2Y receptors couple to G proteins and mediate slower signalling to ATP; they have been reported to inhibit prejunctionally neurotransmission at the peripheral terminals of sympathetic nerves, but little is known about their possible role in the central nervous system and in sympathetic ganglia.

  17. Topographical projections of segmental nerves to the frog glutaeus muscle during loss of polyneuronal innervation.

    Science.gov (United States)

    Bennett, M; Lavidis, N

    1986-06-01

    The development of synaptic connexions to the frog (Limnodynastes tasmaniansis) glutaeus muscle from segmental nerves 8 and 9 was determined using glycogen depletion, contraction and electrophysiological methods between stages 54 and 60 (Nieuwkoop & Faber, 1975). There was no change in the number of muscle cells in the glutaeus from stage 55 onwards; the maturation of muscle cells was most advanced at the point of nerve entry on the ventral surface of the glutaeus and least advanced at the dorsal surface. Electrophysiological determination of the segmental innervation of the dorsal surface of the muscle in low calcium (0.5 mM) indicated that the muscle was almost uniquely innervated by nerve 8 at stage 54. Weak nerve 9 terminals were detected at stage 54 only if the calcium concentration was raised to 6.0 mM. Innervation by nerve 9 was first detected in low calcium at stage 55. There was then a progressive decrease in the innervation of the glutaeus muscle by nerve 8 in regions apposed to the iliofibularis muscle, until stage 59 when this part of the glutaeus was almost completely innervated by nerve 9. Glycogen depletion of muscle fibres following tetanic stimulation of either segmental nerve confirmed that the region of the glutaeus muscle apposed by the iliofibularis becomes progressively innervated by nerve 9 during development. Contraction studies of the segmental innervation of the glutaeus muscle in normal calcium (2 mM) indicated that the muscle was predominantly innervated by nerve 8 at stage 54. There was then a progressive increase in the number of nerve 9 motor units up to stage 56. The size of individual motor units declined for both nerves 8 and 9 until stage 59, when the average motor unit size was about 9% of the muscle. It is suggested that the decline in the innervation by nerve 8 of the side of the glutaeus muscle apposing the iliofibularis muscle is due to this region of the muscle selectively favouring synapse formation by nerve 9 over nerve 8.

  18. A new method of assessing cardiac autonomic function and its comparison with spectral analysis and coefficient of variation of R-R interval.

    Science.gov (United States)

    Toichi, M; Sugiura, T; Murai, T; Sengoku, A

    1997-01-12

    A new non-linear method of assessing cardiac autonomic function was examined in a pharmacological experiment in ten healthy volunteers. The R-R interval data obtained under a control condition and in autonomic blockade by atropine and by propranolol were analyzed by each of the new methods employing Lorenz plot, spectral analysis and the coefficient of variation. With our method we derived two measures, the cardiac vagal index and the cardiac sympathetic index, which indicate vagal and sympathetic function separately. These two indices were found to be more reliable than those obtained by the other two methods. We anticipate that the non-invasive assessment of short-term cardiac autonomic function will come to be performed more reliably and conveniently by this method.

  19. Cortical serotonin and norepinephrine denervation in parkinsonism: preferential loss of the beaded serotonin innervation.

    Science.gov (United States)

    Nayyar, Tultul; Bubser, Michael; Ferguson, Marcus C; Neely, M Diana; Shawn Goodwin, J; Montine, Thomas J; Deutch, Ariel Y; Ansah, Twum A

    2009-07-01

    Parkinson's Disease (PD) is marked by prominent motor symptoms that reflect striatal dopamine insufficiency. However, non-motor symptoms, including depression, are common in PD. It has been suggested that these changes reflect pathological involvement of non-dopaminergic systems. We examined regional changes in serotonin (5-HT) and norepinephrine (NE) systems in mice treated with two different 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) treatment paradigms, at survival times of 3 or 16 weeks after the last MPTP injection. MPTP caused a decrease in striatal dopamine concentration, the magnitude of which depended on the treatment regimen and survival interval after MPTP treatment. There was significant involvement of other subcortical areas receiving a dopamine innervation, but no consistent changes in 5-HT or NE levels in subcortical sites. In contrast, we observed an enduring decrease in 5-HT and NE concentrations in both the somatosensory cortex and medial prefrontal cortex (PFC). Immunohistochemical studies also revealed a decrease in the density of PFC NE and 5-HT axons. The decrease in the cortical serotonergic innervation preferentially involved the thick beaded but not smooth fine 5-HT axons. Similar changes in the 5-HT innervation of post-mortem samples of the PFC from idiopathic PD cases were seen. Our findings point to a major loss of the 5-HT and NE innervations of the cortex in MPTP-induced parkinsonism, and suggest that loss of the beaded cortical 5-HT innervation is associated with a predisposition to the development of depression in PD.

  20. School burnout: increased sympathetic vasomotor tone and attenuated ambulatory diurnal blood pressure variability in young adult women.

    Science.gov (United States)

    May, Ross W; Sanchez-Gonzalez, Marcos A; Fincham, Frank D

    2015-01-01

    Two studies examined autonomic and cardiovascular functioning that may link school burnout to cardiovascular risk factors in young healthy adult females. Study 1 (N = 136) investigated whether school burnout was related to resting values of blood pressure (BP) and blood pressure variability (BPV) through laboratory beat-to-beat BP assessment. Study 2 (N = 94) examined the link between school burnout and diurnal BPV through ambulatory BP monitoring. Controlling for anxiety and depressive symptomatology, school burnout demonstrated strong positive relationships with indices of cardiac sympathovagal tone, sympathetic vasomotor tone, inefficient myocardial oxygen consumption, increased 24-h ambulatory heart rate and BP, blunted BP diurnal variability, and increased arterial stiffness. These studies establish cardiovascular biomarkers of school burnout and suggest that even in a seemingly healthy sample school burnout may predispose females to increased cardiovascular risk. Several future lines of research are outlined.

  1. Nanofibers implant functionalized by neural growth factor as a strategy to innervate a bioengineered tooth.

    Science.gov (United States)

    Eap, Sandy; Bécavin, Thibault; Keller, Laetitia; Kökten, Tunay; Fioretti, Florence; Weickert, Jean-Luc; Deveaux, Etienne; Benkirane-Jessel, Nadia; Kuchler-Bopp, Sabine

    2014-03-01

    Current strategies for jaw reconstruction require multiple procedures, to repair the bone defect, to offer sufficient support, and to place the tooth implant. The entire procedure can be painful and time-consuming, and the desired functional repair can be achieved only when both steps are successful. The ability to engineer combined tooth and bone constructs, which would grow in a coordinated fashion with the surrounding tissues, could potentially improve the clinical outcomes and also reduce patient suffering. A unique nanofibrous and active implant for bone-tooth unit regeneration and also the innervation of this bioengineered tooth are demonstrated. A nanofibrous polycaprolactone membrane is functionalized with neural growth factor, along with dental germ, and tooth innervation follows. Such innervation allows complete functionality and tissue homeostasis of the tooth, such as dentinal sensitivity, odontoblast function, masticatory forces, and blood flow.

  2. Regulation of the renal sympathetic nerves in heart failure

    Directory of Open Access Journals (Sweden)

    Rohit eRamchandra

    2015-08-01

    Full Text Available Heart failure (HF is a serious debilitating condition with poor survival rates and an increasing level of prevalence. Heart failure is associated with an increase in renal norepinephrine spillover, which is an independent predictor of mortality in HF patients. The excessive sympatho-excitation that is a hallmark of heart failure has long-term effects that contribute to disease progression. An increase in directly recorded renal sympathetic nerve activity has also been recorded in animal models of heart failure. This review will focus on the mechanisms controlling sympathetic nerve activity to the kidney during normal conditions and alterations in these mechanisms during heart failure. In particular the roles of afferent reflexes and central mechanisms will be discussed.

  3. Orexin-A controls sympathetic activity and eating behavior.

    Science.gov (United States)

    Messina, Giovanni; Dalia, Carmine; Tafuri, Domenico; Monda, Vincenzo; Palmieri, Filomena; Dato, Amelia; Russo, Angelo; De Blasio, Saverio; Messina, Antonietta; De Luca, Vincenzo; Chieffi, Sergio; Monda, Marcellino

    2014-01-01

    It is extremely important for the health to understand the regulatory mechanisms of energy expenditure. These regulatory mechanisms play a central role in the pathogenesis of body weight alteration. The hypothalamus integrates nutritional information derived from all peripheral organs. This region of the brain controls hormonal secretions and neural pathways of the brainstem. Orexin-A is a hypothalamic neuropeptide involved in the regulation of feeding behavior, sleep-wakefulness rhythm, and neuroendocrine homeostasis. This neuropeptide is involved in the control of the sympathetic activation, blood pressure, metabolic status, and blood glucose level. This minireview focuses on relationship between the sympathetic nervous system and orexin-A in the control of eating behavior and energy expenditure. The "thermoregulatory hypothesis" of food intake is analyzed, underlining the role played by orexin-A in the control of food intake related to body temperature. Furthermore, the paradoxical eating behavior induced orexin-A is illustrated in this minireview.

  4. Orexin-A controls sympathetic activity and eating behavior

    Directory of Open Access Journals (Sweden)

    Giovanni eMessina

    2014-09-01

    Full Text Available It is extremely important for the health to understand the regulatory mechanisms of energy expenditure. These regulatory mechanisms play a central role in the pathogenesis of body weight alteration. The hypothalamus integrates nutritional information derived from all peripheral organs. This region of the brain controls hormonal secretions and neural pathways of the brainstem. Orexin-A is a hypothalamic neuropeptide involved in the regulation of feeding behavior, sleep-wakefulness rhythm, and neuroendocrine homeostasis. This neuropeptide is involved in the control of the sympathetic activation, blood pressure, metabolic status, and blood glucose level. This minireview focuses on relationship between the sympathetic nervous system and orexin-A in the control of eating behavior and energy expenditure. The thermoregulatory hypothesis of food intake is analyzed, underlining the role played by orexin-A in the control of food intake related to body temperature. Furthermore, the paradoxical eating behavior induced orexin-A is illustrated in this minireview.

  5. Innervation pattern of the suprascapular nerve within supraspinatus: a three-dimensional computer modeling study.

    Science.gov (United States)

    Hermenegildo, J A; Roberts, S L; Kim, S Y

    2014-05-01

    The relationship between the innervation pattern of the suprascapular nerve (SSN) and the muscle architecture of supraspinatus has not been thoroughly investigated. The supraspinatus is composed of two architecturally distinct regions: anterior and posterior. Each of these regions is further subdivided into three parts: superficial, middle and deep. The purpose of this study was to investigate the course of the SSN throughout the volume of supraspinatus and to relate the intramuscular branches to the distinct regions and parts of the supraspinatus. The SSN was dissected in thirty formalin embalmed cadaveric specimens and digitized throughout the muscle volume in six of those specimens. The digitized data were modeled using Autodesk(®) Maya(®) 2011. The three-dimensional (3D) models were used to relate the intramuscular innervation pattern to the muscle and tendon architecture defined by Kim et al. (2007, Clin Anat 20:648-655). The SSN bifurcated into two main trunks: medial and lateral. All parts of the anterior region were predominantly innervated by the medial trunk and its proximal and medial branches, whereas all parts of the posterior region predominantly by the lateral trunk and its posterolateral and/or posteromedial branches. The posterior region also received innervation from the proximal branch of the medial trunk in half of the specimens. These findings provide evidence that the anterior and posterior regions are distinct with respect to their innervation. The 3D map of the innervation pattern will aid in planning future clinical studies investigating muscle activation patterns and provide insight into possible injury of the nerve with supraspinatus pathology and surgical techniques.

  6. The adductor part of the adductor magnus is innervated by both obturator and sciatic nerves.

    Science.gov (United States)

    Takizawa, Megumi; Suzuki, Daisuke; Ito, Hajime; Fujimiya, Mineko; Uchiyama, Eiichi

    2014-07-01

    The hip adductor group, innervated predominantly by the obturator nerve, occupies a large volume of the lower limb. However, case reports of patients with obturator nerve palsy or denervation have described no more than minimal gait disturbance. Those facts are surprising, given the architectural characteristics of the hip adductors. Our aim was to investigate which regions of the adductor magnus are innervated by the obturator nerve and by which sciatic nerve and to consider the clinical implications. Twenty-one lower limbs were examined from 21 formalin-fixed cadavers, 18 males and 3 females. The adductor magnus was dissected and was divided into four parts (AM1-AM4) based on the locations of the perforating arteries and the adductor hiatus. AM1 was supplied solely by the obturator nerve. AM2, AM3, and AM4 received innervation from both the posterior branch of the obturator nerve and the tibial nerve portion of the sciatic nerve in 2 (9.5%), 20 (95.2%), and 6 (28.6%) of the cadavers, respectively. The double innervation in more than 90% of the AM3s is especially noteworthy. Generally, AM1-AM3 corresponds to the adductor part, traditionally characterized as innervated by the obturator nerve, and AM4 corresponds to the hamstrings part, innervated by the sciatic nerve. Here, we showed that the sciatic nerve supplies not only the hamstrings part but also the adductor part. These two nerves spread more widely than has generally been believed, which could have practical implications for the assessment and treatment of motor disability.

  7. Localization of Biogenic Amines in the Foregut of Aplysia californica: Catecholaminergic and Serotonergic Innervation

    Science.gov (United States)

    Martínez-Rubio, Clarissa; Serrano, Geidy E.; Miller, Mark W.

    2009-01-01

    This study examined the catecholaminergic and serotonergic innervation of the foregut of Aplysia californica, a model system in which the control of feeding behaviors can be investigated at the cellular level. Similar numbers (15-25) of serotonin-like-immunoreactive (5HTli) and tyrosine hydroxylase-like-immunoreactive (THli) fibers were present in each (bilateral) esophageal nerve (En), the major source of pregastric neural innervation in this system. The majority of En 5HTli and THli fibers originated from the anterior branch (En2), which innervates the pharynx and the anterior esophagus. Fewer fibers were present in the posterior branch (En1), which innervates the majority of the esophagus and the crop. Backfills of the two En branches toward the central nervous system (CNS) labeled a single, centrifugally projecting serotonergic fiber, originating from the metacerebral cell (MCC). The MCC fiber projected only to En2. No central THli neurons were found to project to the En. Surveys of the pharynx and esophagus revealed major differences between their patterns of catecholaminergic (CA) and serotonergic innervation. Whereas THli fibers and cell bodies were distributed throughout the foregut, 5HTli fibers were present in restricted plexi, and no 5HTli somata were detected. Double-labeling experiments in the periphery revealed THli neurons projecting toward the buccal ganglion via En2. Other afferents received dense perisomatic serotonergic innervation. Finally, qualitative and quantitative differences were observed between the buccal motor programs (BMPs) produced by stimulation of the two En branches. These observations increase our understanding of aminergic contributions to the pregastric regulation of Aplysia feeding behaviors. PMID:19330814

  8. Quantified distribution of the noradrenaline innervation in the hippocampus of adult rat

    Energy Technology Data Exchange (ETDEWEB)

    Oleskevich, S.; Descarries, L.; Lacaille, J.C. (Universite de Montreal, Quebec (Canada))

    1989-11-01

    A recently developed radioautographic technique, based on the uptake labeling of monoamine terminals in vitro, was used to quantify the noradrenaline (NA) innervation in adult rat hippocampus. After incubation of brain slices with 1 microM 3H-NA, the NA varicosities were visualized as small aggregates of silver grains, in light microscope radioautographs prepared at 3 equidistant horizontal levels across the ventral 2/3 of the hippocampus. Using a computer-assisted image analyzer, counts were obtained from the subiculum (SUB), 3 sectors of Ammon's horn (CA1, CA3-a, CA3-b) and 3 sectors of the dentate gyrus (DG-medial blade, crest, and lateral blade), every lamina being sampled in each region. After a double correction for duration of radioautographic exposure and section thickness, and following measurement of varicosity diameter in electron microscope radioautographs, it was possible to express these results in number of terminals per volumetric unit of tissue. It was thus found that the overall density of hippocampal NA innervation averages 2.1 million varicosities/mm3 of tissue, a value almost twice as high as that in cerebral cortex. This innervation is 20% denser ventrally than dorsally and is heterogeneous both in terms of regional and laminar distribution. SUB and DG are more strongly innervated than Ammon's horn, wherein CA1 has the lowest overall density. In SUB and CA1, there is a clear predilection of NA varicosities for the stratum moleculare. In CA3, there is a narrow band of even stronger innervation in the stratum radiatum, near the apical border of the stratum pyramidale, contrasting with a 3 times lower density in this cell layer and the stratum oriens. In DG, the NA innervation is again the weakest in the cell body layer and exhibits an almost 3-fold greater density in the polymorph layer, the highest of all hippocampus.

  9. Contributions of central command and muscle feedback to sympathetic nerve activity in contracting human skeletal muscle

    Directory of Open Access Journals (Sweden)

    Daniel eBoulton

    2016-05-01

    Full Text Available During voluntary contractions, muscle sympathetic nerve activity (MSNA to contracting muscles increases in proportion to force but the underlying mechanisms are not clear. To shed light on these mechanisms, particularly the influences of central command and muscle afferent feedback, the present study tested the hypothesis that MSNA is greater during voluntary compared with electrically-evoked contractions. Seven male subjects performed a series of 1-minute isometric dorsiflexion contractions (left leg separated by 2-minute rest periods, alternating between voluntary and electrically-evoked contractions at similar forces (5-10 % of maximum. MSNA was recorded continuously (microneurography from the left peroneal nerve and quantified from cardiac-synchronised, negative-going spikes in the neurogram. Compared with pre-contraction values, MSNA increased by 51 ± 34 % (P 0.05. MSNA analysed at 15-s intervals revealed that this effect of voluntary contraction appeared 15-30 s after contraction onset (P < 0.01, remained elevated until the end of contraction, and disappeared within 15 s after contraction. These findings suggest that central command, and not feedback from contracting muscle, is the primary mechanism responsible for the increase in MSNA to contracting muscle. The time-course of MSNA suggests that there is a longer delay in the onset of this effect compared with its cessation after contraction.

  10. Sympathetic cooling of $^4$He$^+$ ions in a radiofrequency trap

    CERN Document Server

    Roth, B; Schiller, S

    2004-01-01

    We have generated Coulomb crystals of ultracold $^4$He$^+$ ions in a linear radiofrequency trap, by sympathetic cooling via laser--cooled $^9$Be$^+$. Stable crystals containing up to 150 localized He$^+$ ions at $\\sim$20 mK were obtained. Ensembles or single ultracold He$^+$ ions open up interesting perspectives for performing precision tests of QED and measurements of nuclear radii. The present work also indicates the feasibility of cooling and crystallizing highly charged atomic ions using $^9$Be$^+$ as coolant.

  11. Comparison of compensatory sweating and quality of life following thoracic sympathetic block for palmar hyperhidrosis: electrocautery hook versus titanium clip

    Institute of Scientific and Technical Information of China (English)

    WANG Fei-ge; CHEN Yong-bing; YANG Wen-tao; SHI Li

    2011-01-01

    Background Video-assisted thoracic sympathetic block is an effective,safe,and minimally invasive method fortreatment of primary hyperhidrosis.The purpose of this study was to decide which one of using electrocautery hook and titanium clip is the appropriate procedure for primary palmar hyperhidrosis by assessing the compensatory sweating (CS)and quality of life (QOL) of patients after sympathetic block.Methods Between October 2007 to August 2010,120 patients with primary palmar hyperhidrosis were randomly divided into two groups,electrocautery hook group (60 patients) and titanium clip group (60 patients).All patients were treated by sympathetic block at T4 level.The CS was graded based on severity and location; the QOL was classified to 5 different levels based upon the summed total scores (range from 20 to 100) before and after surgery.The variables were compared.Results The postoperative follow-up period was 2 months.All patients were cured.Three patients in electrocautery hook group and 1 patient in titanium clip group had a unilateral pneumothorax on chest X-ray,but none of them was necessary to have chest drainage.Neither perioperative mortality nor serious complications such as cardiac arrhythmia or arrest were observed during the operation.No bradycardia or Horner's syndrome occured.CS was not more common in patients in titanium clip group than in those in electrocautery hook group (P=0.001).Moderate and severe CS was few in all patients,and there was no significant difference between two groups (P=-0.193).Most of the patients feel a notable improvement of the the QOL; nevertheless,there was no significant difference between the groups (P=0.588).Conclusions Both electrocautery hook and titanium clip used for sympathetic block at the T4 level are effective,safe,and minimally invasive for palmar hyperhidrosis.Because of the lower severity of CS and the similar improvements in the QOL after operation,we prefer to use of titanium clip for treating palmar

  12. Understanding paroxysmal sympathetic hyperactivity after traumatic brain injury

    Directory of Open Access Journals (Sweden)

    Kimberly S Meyer

    2014-01-01

    Full Text Available Background: Paroxysmal sympathetic hyperactivity (PSH is a condition occurring in a small percentage of patients with severe traumatic brain injury (TBI. It is characterized by a constellation of symptoms associated with excessive adrenergic output, including tachycardia, hypertension, tachypnea, and diaphoresis. Diagnosis is one of exclusion and, therefore, is often delayed. Treatment is aimed at minimizing triggers and pharmacologic management of symptoms. Methods: A literature review using medline and cinahl was conducted to identify articles related to PSH. Search terms included paroxysmal sympathetic hyperactivity, autonomic storming, diencephalic seizures, and sympathetic storming. Reference lists of pertinent articles were also reviewed and these additional papers were included. Results: The literature indicates that the understanding of PSH following TBI is in its infancy. The majority of information is based on small case series. The review revealed treatments that may be useful in treating PSH. Conclusions: Nurses play a critical role in the identification of at-risk patients, symptom complexes, and in the education of family. Early detection and treatment is likely to decrease overall morbidity and facilitate recovery. Further research is needed to establish screening tools and treatment algorithms for PSH.

  13. Sympathetic nerve activity and simulated diving in healthy humans.

    Science.gov (United States)

    Shamsuzzaman, Abu; Ackerman, Michael J; Kuniyoshi, Fatima Sert; Accurso, Valentina; Davison, Diane; Amin, Raouf S; Somers, Virend K

    2014-04-01

    The goal of our study was to develop a simple and practical method for simulating diving in humans using facial cold exposure and apnea stimuli to measure neural and circulatory responses during the stimulated diving reflex. We hypothesized that responses to simultaneous facial cold exposure and apnea (simulated diving) would be synergistic, exceeding the sum of responses to individual stimuli. We studied 56 volunteers (24 female and 32 male), average age of 39 years. All subjects were healthy, free of cardiovascular and other diseases, and on no medications. Although muscle sympathetic nerve activity (MSNA), blood pressure, and vascular resistance increased markedly during both early and late phases of simulated diving, significant reductions in heart rate were observed only during the late phase. Total MSNA during simulated diving was greater than combined MSNA responses to the individual stimuli. We found that simulated diving is a powerful stimulus to sympathetic nerve traffic with significant bradycardia evident in the late phase of diving and eliciting synergistic sympathetic and parasympathetic responses. Our data provide insight into autonomic triggers that could help explain catastrophic cardiovascular events that may occur during asphyxia or swimming, such as in patients with obstructive sleep apnea or congenital long QT syndrome.

  14. Neuronal morphology and the synaptic organisation of sympathetic ganglia.

    Science.gov (United States)

    Gibbins, I L; Jobling, P; Messenger, J P; Teo, E H; Morris, J L

    2000-07-01

    In this article, we provide a short review of the structure and synaptic organisation of the final motor neurons in the sympathetic ganglia of mammals. Combinations of pathway tracing, multiple-labelling immunofluorescence and intracellular dye injection have shown that neurons in different functional pathways differ not only in their patterns of neuropeptide expression, but also in the size of their cell bodies and dendritic fields. Thus, vasoconstrictor neurons consistently are smaller than any other major functional class of neurons. Serial section ultrastructural analysis of dye filled neurons, together with electron microscopic and confocal microscopic analysis of immunolabelled synaptic inputs to sympathetic final motor neurons indicate that synapses are rare and randomly distributed over the surface of the neurons. The total number of synapses is simply proportional to the total surface area of the neurons. Many terminal boutons of peptide-containing preganglionic neurons do not make conventional synapses with target neurons. Furthermore, there is a spatial mismatch in the distribution of peptide-containing terminals and neurons expressing receptors for the corresponding peptides. Together, these results suggest that there are likely to be significant differences in the ways that the final sympathetic motor neurons in distinct functional pathways integrate their synaptic inputs. In at least some pathways, heterosynaptic actions of neuropeptides probably contribute to subtle modulation of ganglionic transmission.

  15. Sympathetic Responses to Noxious Stimulation of Muscle and Skin.

    Science.gov (United States)

    Burton, Alexander R; Fazalbhoy, Azharuddin; Macefield, Vaughan G

    2016-01-01

    Acute pain triggers adaptive physiological responses that serve as protective mechanisms that prevent continuing damage to tissues and cause the individual to react to remove or escape the painful stimulus. However, an extension of the pain response beyond signaling tissue damage and healing, such as in chronic pain states, serves no particular biological function; it is maladaptive. The increasing number of chronic pain sufferers is concerning, and the associated disease burden is putting healthcare systems around the world under significant pressure. The incapacitating effects of long-lasting pain are not just psychological - reflexes driven by nociceptors during the establishment of chronic pain may cause serious physiological consequences on regulation of other body systems. The sympathetic nervous system is inherently involved in a host of physiological responses evoked by noxious stimulation. Experimental animal and human models demonstrate a diverse array of heterogeneous reactions to nociception. The purpose of this review is to understand how pain affects the sympathetic nervous system by investigating the reflex cardiovascular and neural responses to acute pain and the long-lasting physiological responses to prolonged (tonic) pain. By observing the sympathetic responses to long-lasting pain, we can begin to understand the physiological consequences of long-term pain on cardiovascular regulation.

  16. Transcutaneous cervical vagal nerve stimulation modulates cardiac vagal tone and tumor necrosis factor-alpha.

    Science.gov (United States)

    Brock, C; Brock, B; Aziz, Q; Møller, H J; Pfeiffer Jensen, M; Drewes, A M; Farmer, A D

    2016-12-12

    The vagus nerve is a central component of cholinergic anti-inflammatory pathways. We sought to evaluate the effect of bilateral transcutaneous cervical vagal nerve stimulation (t-VNS) on validated parameters of autonomic tone and cytokines in 20 healthy subjects. 24 hours after t-VNS, there was an increase in cardiac vagal tone and a reduction in tumor necrosis factor-α in comparison to baseline. No change was seen in blood pressure, cardiac sympathetic index or other cytokines. These preliminary data suggest that t-VNS exerts an autonomic and a subtle antitumor necrosis factor-α effect, which warrants further evaluation in larger controlled studies.

  17. Associations between xerostomia, histopathological alterations, and autonomic innervation of labial salivary glands in men in late midlife

    DEFF Research Database (Denmark)

    Sørensen, Christiane Elisabeth; Larsen, Jytte Overgaard; Reibel, Jesper

    2014-01-01

    glands and with quantitative measures of the glandular autonomic innervation. Another aim was to study the relation between the autonomic innervation and loss of secretory acinar cells in these glands. METHODS: Labial salivary gland biopsies were taken from the lower lip from 190 men, born in 1953...

  18. Simultaneous parasympathetic and sympathetic activation reveals altered autonomic control of heart rate, vascular tension and epinephrine release in anaesthetized hypertensive rats

    Directory of Open Access Journals (Sweden)

    Torill eBerg

    2011-11-01

    Full Text Available Sympathetic hyperactivity and parasympathetic insufficiency characterize blood pressure control in genetic hypertension, but is difficult to demonstrate experimentally in anesthetized rats. Here we present a pharmacological approach to activate sympathetic and parasympathetic nerves simultaneously, and identify their contribution. Anaesthetized normotensive (WKY and spontaneously hypertensive rats (SHR were injected i.v. with 4-aminopyridine (4-AP, a voltage-sensitive K+ channel inhibitor. Blood pressure was recorded through a femoral artery catheter, cardiac output and heart rate (HR through an ascending aorta flow probe. Total peripheral vascular resistance (TPVR was calculated. 4-AP induced an immediate, atropine- and hexamethonium-sensitive bradycardia in WKY, and in strains, a subsequent, sustained tachycardia, and norepinephrine but not epinephrine release. The tachycardia was eliminated by reserpine, nadolol or right vagal nerve stimulation, but not adrenalectomy, scopolamine or hexamethonium. 4-AP-induced, atropine-sensitive bradycardia was observed in reserpinized or nadolol-treated SHR, where atropine also increased the late HR-response. 4-AP increased TPVR, transiently in WKY but sustained in SHR. Yohimbine but not phentolamine prevented TPVR down-regulation in WKY. Reserpine, phentolamine and prazosin eliminated the late vasoconstriction in SHR. Plasma epinephrine overflow increased in nadolol-treated SHR. Conclusions: 4-AP activated parasympathetic ganglion transmission and peripheral, sympathetic nerve norepinephrine release. The sympathetic component dominated the HR-response to 4-AP in SHR. α2-adrenceptor-dependent vasodilatation opposed norepinephrine-induced α1-adrenergic vasoconstriction in WKY, but not in SHR. A βAR-activated, probably vagal afferent mechanism, hampered adrenal epinephrine secretion in SHR. Thus, 4-AP exposed mechanisms, which contribute to hypertension, and may allow identification of the factors

  19. Local Sympathetic Denervation of Femoral Artery in a Rabbit Model by Using 6-Hydroxydopamine In Situ

    Directory of Open Access Journals (Sweden)

    Yufei Jin

    2014-01-01

    Full Text Available Both artery bundle and sympathetic nerve were involved with the metabolism of bone tissues. Whether the enhancing effects of artery bundle result from its accompanying sympathetic nerve or blood supply is still unknown. There is no ideal sympathetic nerve-inhibited method for the in situ denervation of artery bundle. Therefore, we dipped the femoral artery in the 6-hydroxydopamine (6-OHDA locally and observed its effect. Compared with control group, the in situ treatment of 6-OHDA did not damage the normal structure of vascular bundle indicated by hematoxylin-eosin (HE staining. However, the functions of sympathetic nerve was completely inhibited for more than 2 weeks, and only a few function of sympathetic nerve resumed 4 weeks later, evidenced by glyoxylic acid staining and the expression of tyrosine hydroxylase (TH and nerve peptide Y (NPY. Thus, 6-OHDA is promising as an ideal reagent for the local denervation of sympathetic nerve from artery system.

  20. Cardiac tamponade (image)

    Science.gov (United States)

    Cardiac tamponade is a condition involving compression of the heart caused by blood or fluid accumulation in the space ... they cannot adequately fill or pump blood. Cardiac tamponade is an emergency condition that requires hospitalization.

  1. What Is Cardiac Rehabilitation?

    Science.gov (United States)

    ANSWERS by heart Treatments + Tests What Is Cardiac Rehabilitation? A cardiac rehabilitation (rehab) program takes place in a hospital or ... special help in making lifestyle changes. During your rehabilitation program you’ll… • Have a medical evaluation to ...

  2. Clinical research progress in percutaneous catheter ablation of renal sympathetic nerve%经导管肾交感神经射频消融术临床研究进展

    Institute of Scientific and Technical Information of China (English)

    潘涛; 郭金和; 滕皋军

    2015-01-01

    Transcatheter renal sympathetic denervation with radiofrequency ablation has become a new treatment for refractory hypertension.Recent studies have showed that renal sympathetic denervation can also treat the diseases that are related to increased sympathetic nerve activity, such as metabolic diseases, cardiac disfunction, arrhythmia, obstructive sleep apnea syndrome, polycystic ovary syndrome, renal failure, etc. This paper aims to make a general review on the recent clinical research progress about renal sympathetic denervation with radiofrequency ablation.%经导管肾交感神经射频消融术(RDN)是治疗顽固性高血压的新手段,进一步研究发现RDN术还可治疗交感神经活性增高相关疾病,如代谢性疾病、心功能不全、心律失常、阻塞性睡眠呼吸暂停综合征、多囊卵巢综合征和肾功能不全等.本文就RDN术临床研究进展作一综述.

  3. Sympathetic Blocks Provided Sustained Pain Relief in a Patient with Refractory Painful Diabetic Neuropathy

    OpenAIRE

    2012-01-01

    The sympathetic nervous system has been implicated in pain associated with painful diabetic neuropathy. However, therapeutic intervention targeted at the sympathetic nervous system has not been established. We thus tested the hypothesis that sympathetic nerve blocks significantly reduce pain in a patient with painful diabetic neuropathy who has failed multiple pharmacological treatments. The diagnosis of small fiber sensory neuropathy was based on clinical presentations and confirmed by skin ...

  4. Statins decrease dendritic arborization in rat sympathetic neurons by blocking RhoA activation

    OpenAIRE

    Kim, Woo-Yang; Gonsiorek, Eugene A.; Barnhart, Chris; Davare, Monika A.; Engebose, Abby J.; Lauridsen, Holly; Bruun, Donald; Lesiak, Adam; Wayman, Gary; Bucelli, Robert; Higgins, Dennis; Lein, Pamela J.

    2009-01-01

    Clinical and experimental evidence suggest that statins decrease sympathetic activity, but whether peripheral mechanisms involving direct actions on post-ganglionic sympathetic neurons contribute to this effect is not known. Because tonic activity of these neurons is directly correlated with the size of their dendritic arbor, we tested the hypothesis that statins decrease dendritic arborization in sympathetic neurons. Oral administration of atorvastatin (20 mg/kg/day for 7 days) significantly...

  5. [Sympathetic nerve activity in chronic renal failure - what are the therapeutic options?].

    Science.gov (United States)

    Hausberg, M; Tokmak, F

    2013-11-01

    Patients with chronic renal failure are characterized by a tonic elevation of sympathetic tone. This factor largely contributes to their increased cardiovascular risk. The increased sympathetic drive is caused by activiation of renal afferent fibers in the diseased kidneys. Therapeutic options for hypertensive patients with chronic renal failure with respect to their sympathetic overactivity are inhibitors of the renin-angiotensin-system and central sympatholytic drugs. The role of catheter-based renal denervation in these patients is currently under investigation.

  6. Prostate innervation and local anesthesia in prostate procedures Inervação prostática e anestesia local em procedimentos prostáticos

    Directory of Open Access Journals (Sweden)

    Alexandre Oliveira Rodrigues

    2002-01-01

    Full Text Available The nerve supply of the human prostate is very abundant, and knowledge of the anatomy contributes to successful administration of local anesthesia. However, the exact anatomy of extrinsic neuronal cell bodies of the autonomic and sensory innervation of the prostate is not clear, except in other animals. Branches of pelvic ganglia composed of pelvic (parasympathetic and hypogastric (sympathetic nerves innervate the prostate. The autonomic nervous system plays an important role in the growth, maturation, and secretory function of this gland. Prostate procedures under local anesthesia, such as transurethral prostatic resections or transrectal ultrasound-guided prostatic biopsy, are safe, simple, and effective. Local anesthesia can be feasible for many special conditions including uncomplicated prostate surgery and may be particularly useful for the high-risk group of patients for whom inhalation or spinal anesthesia is inadvisable.A prostáta, uma das glândulas sexuais acessórias masculinas, possui inervação muito rica. A anatomia detalhada dos corpos neuronais extrínsecos responsáveis pela inervação autonômica e sensorial da próstata não está totalmente esclarecida, exceto em animais. A próstata é inervada pelos nervos pélvico (parassimpático e hipogástrico (simpático, ramos dos gânglios nervosos pélvicos. O sistema nervoso autonômico possui importante papel no crescimento, maturação e na função secretora desta glândula. Alguns procedimentos prostáticos, como resecção transuretral ou biópsia transretal guiada por ultra-sonografia, são simples, eficazes e seguros com o uso de anestesia local. Esta opção pode ser factível frente à várias condições especiais, como cirurgias prostáticas simples, sendo particularmente útil no grupo de pacientes de alto risco cirúrgico, onde a anestesia inalatória ou espinhal não é aconselhável.

  7. Organization Of Lumbosacral Motoneuronal Cell Groups Innervating Hindlimb, Pelvic Floor And Axial Muscles In The Cat.

    NARCIS (Netherlands)

    Holstege, G.; VanderHorst, V.G.J.M.

    1997-01-01

    In a study on descending pathways from the nucleus retroambiguus (NRA) to hindlimb motoneurons (see accompanying paper), it appeared impossible, using data from the literature, to precisely determine which muscles were innervated by the motoneurons receiving the NRA fibers. This lack of data made it

  8. Organization of lumbosacral motoneuronal cell groups innervating hindlimb, pelvic floor, and axial muscles in the cat

    NARCIS (Netherlands)

    Vanderhorst, VGJM; Holstege, G

    1997-01-01

    In a study on descending pathways from the nucleus retroambiguus (NRA) to hindlimb motoneurons (see accompanying paper), it appeared impossible, using data from the literature, to precisely determine which muscles were innervated by the motoneurons receiving the NRA fibers. This lack of data made it

  9. The role of Sema3–Npn-1 signaling during diaphragm innervation and muscle development

    Science.gov (United States)

    Huettl, Rosa-Eva; Hanuschick, Philipp; Amend, Anna-Lena; Alberton, Paolo; Aszodi, Attila; Huber, Andrea B.

    2016-01-01

    ABSTRACT Correct innervation of the main respiratory muscle in mammals, namely the thoracic diaphragm, is a crucial pre-requisite for the functionality of this muscle and the viability of the entire organism. Systemic impairment of Sema3A–Npn-1 (Npn-1 is also known as NRP1) signaling causes excessive branching of phrenic nerves in the diaphragm and into the central tendon region, where the majority of misguided axons innervate ectopic musculature. To elucidate whether these ectopic muscles are a result of misguidance of myoblast precursors due to the loss of Sema3A–Npn-1 signaling, we conditionally ablated Npn-1 in somatic motor neurons, which led to a similar phenotype of phrenic nerve defasciculation and, intriguingly, also formation of innervated ectopic muscles. We therefore hypothesize that ectopic myocyte fusion is caused by additional factors released by misprojecting growth cones. Slit2 and its Robo receptors are expressed by phrenic motor axons and migrating myoblasts, respectively, during innervation of the diaphragm. In vitro analyses revealed a chemoattractant effect of Slit2 on primary diaphragm myoblasts. Thus, we postulate that factors released by motor neuron growth cones have an influence on the migration properties of myoblasts during establishment of the diaphragm. PMID:27466379

  10. Peptidergic and non-peptidergic innervation and vasomotor responses of human lenticulostriate and posterior cerebral arteries

    DEFF Research Database (Denmark)

    Jansen-Olesen, Inger; Gulbenkian, Sergio; Engel, Ulla;

    2004-01-01

    -hydroxytryptamine (5-HT) and the relaxant responses induced by acetylcholine (ACh), VIP and pituitary adenylate cyclase activating peptide-27 (PACAP) as well as CGRP and SP were compared in vitro. In conclusion, there was no major difference in innervation pattern or vasomotor sensitivity (pEC50 and pIC50 values...

  11. Bilateral familial vertical Duane Syndrome with synergistic convergence, aberrant trigeminal innervation, and facial hypoplasia

    Directory of Open Access Journals (Sweden)

    Malvika Gupta

    2014-01-01

    Full Text Available A 5-year-old girl presented with bilateral familial vertical  Duane retraction syndrome with alternating esotropia, elevation deficit, Marcus gunn phenomenon, and facial hypoplasia. Abnormal adducting downshoots on attempting abduction suggestive of a synergistic convergence were noted. Hypothesis suggests aberrant innervations or peripheral anatomic connections between inferior and medial recti.

  12. Innervation Patterns of Sea Otter (Enhydra lutris Mystacial Follicle-Sinus Complexes

    Directory of Open Access Journals (Sweden)

    Christopher Douglas Marshall

    2014-10-01

    Full Text Available Sea otters (Enhydra lutris are the most recent group of mammals to return to the sea, and may exemplify divergent somatosensory tactile systems among mammals. Therefore, we quantified the mystacial vibrissal array of sea otters and histologically processed follicle-sinus complexes (F-SCs to test the hypotheses that the number of myelinated axons per F-SC is greater than that found for terrestrial mammalian vibrissae and that their organization and microstructure converge with those of pinniped vibrissae. A mean of 120.5 vibrissae were arranged rostrally on a broad, blunt muzzle in 7-8 rows and 9-13 columns. The F-SCs of sea otters are tripartite in their organization and similar in microstructure to pinnipeds rather than terrestrial species. Each F-SC was innervated by a mean 1339±408.3 axons. Innervation to the entire mystacial vibrissal array was estimated at 161,313 axons. Our data support the hypothesis that the disproportionate expansion of the coronal gyrus in somatosensory cortex of sea otters is related to the high innervation investment of the mystacial vibrissal array, and that quantifying innervation investment is a good proxy for tactile sensitivity. We predict that the tactile performance of sea otter mystacial vibrissae is comparable to that of harbor seals, sea lions and walruses¬.

  13. Effect of functional sympathetic nervous system impairment of the liver and abdominal visceral adipose tissue on circulating triglyceride-rich lipoproteins

    Science.gov (United States)

    Cirnigliaro, Christopher M.; Kirshblum, Steven C.; McKenna, Cristin

    2017-01-01

    Background Interruption of sympathetic innervation to the liver and visceral adipose tissue (VAT) in animal models has been reported to reduce VAT lipolysis and hepatic secretion of very low density lipoprotein (VLDL) and concentrations of triglyceride-rich lipoprotein particles. Whether functional impairment of sympathetic nervous system (SNS) innervation to tissues of the abdominal cavity reduce circulating concentrations of triglyceride (TG) and VLDL particles (VLDL-P) was tested in men with spinal cord injury (SCI). Methods One hundred-three non-ambulatory men with SCI [55 subjects with neurologic injury at or proximal to the 4th thoracic vertebrae (↑T4); 48 subjects with SCI at or distal to the 5th thoracic vertebrae (↓T5)] and 53 able-bodied (AB) subjects were studied. Fasting blood samples were obtained for determination of TG, VLDL-P concentration by NMR spectroscopy, serum glucose by autoanalyzer, and plasma insulin by radioimmunoassay. VAT volume was determined by dual energy x-ray absorptiometry imaging with calculation by a validated proprietary software package. Results Significant group main effects for TG and VLDL-P were present; post-hoc tests revealed that serum TG concentrations were significantly higher in ↓T5 group compared to AB and ↑T4 groups [150±9 vs. 101±8 (p<0.01) and 112±8 mg/dl (p<0.05), respectively]. VLDL-P concentration was significantly elevated in ↓T5 group compared to AB and ↑T4 groups [74±4 vs. 58±4 (p<0.05) and 55±4 μmol/l (p<0.05)]. VAT volume was significantly higher in both SCI groups than in the AB group, and HOMA-IR was higher and approached significance in the SCI groups compared to the AB group. A linear relationship between triglyceride rich lipoproteins (i.e., TG or Large VLDL-P) and VAT volume or HOMA-IR was significant only in the ↓T5 group. Conclusions Despite a similar VAT volume and insulin resistance in both SCI groups, the ↓T5 group had significantly higher serum TG and VLDL-P values than

  14. Cardiac sodium channelopathies

    NARCIS (Netherlands)

    Amin, A.S.; Asghari-Roodsari, A.; Tan, H.L.

    2010-01-01

    Cardiac sodium channel are protein complexes that are expressed in the sarcolemma of cardiomyocytes to carry a large inward depolarizing current (I-Na) during phase 0 of the cardiac action potential. The importance of I-Na for normal cardiac electrical activity is reflected by the high incidence of

  15. Double muscle innervation using end-to-side neurorrhaphy in rats

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    Elisangela Jeronymo Stipp-Brambilla

    Full Text Available CONTEXT AND OBJECTIVE: One of the techniques used for treating facial paralysis is double muscle innervation using end-to-end neurorrhaphy with sectioning of healthy nerves. The aim of this study was to evaluate whether double muscle innervation by means of end-to-side neurorrhaphy could occur, with maintenance of muscle innervation. DESIGN AND SETTING: Experimental study developed at the Experimental Research Center, Faculdade de Medicina de Botucatu, Unesp. METHODS: One hundred rats were allocated to five groups as follows: G1, control group; G2, the peroneal nerve was sectioned; G3, the tibial nerve was transected and the proximal stump was end-to-side sutured to the intact peroneal nerve; G4, 120 days after the G3 surgery, the peroneal nerve was sectioned proximally to the neurorrhaphy; G5, 120 days after the G3 surgery, the peroneal and tibial nerves were sectioned proximally to the neurorrhaphy. RESULTS: One hundred and fifty days after the surgery, G3 did not show any change in tibial muscle weight or muscle fiber diameter, but the axonal fiber diameter in the peroneal nerve distal to the neurorrhaphy had decreased. Although G4 showed atrophy of the cranial tibial muscle 30 days after sectioning the peroneal nerve, the electrophysiological test results and axonal diameter measurement confirmed that muscle reinnervation had occurred. CONCLUSION: These findings suggest that double muscle innervation did not occur through end-to-side neurorrhaphy; the tibial nerve was not able to maintain muscle innervation after the peroneal nerve had been sectioned, although muscle reinnervation was found to have occurred, 30 days after the peroneal nerve had been sectioned.

  16. Neurotrophic Modulation of Myelinated Cutaneous Innervation and Mechanical Sensory Loss in Diabetic Mice

    Science.gov (United States)

    Christianson, Julie A.; Ryals, Janelle M.; Johnson, Megan S.; Dobrowsky, Rick T.; Wright, Douglas E.

    2007-01-01

    Human diabetic patients often lose touch and vibratory sensations, but to date, most studies on diabetes-induced sensory nerve degeneration have focused on epidermal C-fibers. Here, we explored the effects of diabetes on cutaneous myelinated fibers in relation to the behavioral responses to tactile stimuli from diabetic mice. Weekly behavioral testing began prior to STZ administration and continued until 8 weeks, at which time myelinated fiber innervation was examined in the footpad by immunohistochemistry using antiserum to NF-H and MBP. Diabetic mice developed reduced behavioral responses to non-noxious (monofilaments) and noxious (pin prick) stimuli. In addition, diabetic mice displayed a 50% reduction in NF-H-positive myelinated innervation of the dermal footpad compared to non-diabetic mice. To test whether two neurotrophins NGF and/or NT-3 known to support myelinated cutaneous fibers could influence myelinated innervation, diabetic mice were treated intrathecally for two weeks with NGF, NT-3, NGF and NT-3. Neurotrophin-treated mice were then compared to diabetic mice treated with insulin for two weeks. NGF and insulin treatment both increased paw withdrawal to mechanical stimulation in diabetic mice, whereas NT-3 or a combination of NGF and NT-3 failed to alter paw withdrawal responses. Surprisingly, all treatments significantly increased myelinated innervation compared to control-treated diabetic mice, demonstrating that myelinated cutaneous fibers damaged by hyperglycemia respond to intrathecal administration of neurotrophins. Moreover, NT-3 treatment increased epidermal Merkel cell numbers associated with nerve fibers, consistent with increased numbers of NT-3-responsive slowly adapting A-fibers. These studies suggest that myelinated fiber loss may contribute as significantly as unmyelinated epidermal loss in diabetic neuropathy, and the contradiction between neurotrophin-induced increases in dermal innervation and behavior emphasize the need for multiple

  17. Cell type-specific thalamic innervation in a column of rat vibrissal cortex.

    Science.gov (United States)

    Meyer, Hanno S; Wimmer, Verena C; Hemberger, Mike; Bruno, Randy M; de Kock, Christiaan P J; Frick, Andreas; Sakmann, Bert; Helmstaedter, Moritz

    2010-10-01

    This is the concluding article in a series of 3 studies that investigate the anatomical determinants of thalamocortical (TC) input to excitatory neurons in a cortical column of rat primary somatosensory cortex (S1). We used viral synaptophysin-enhanced green fluorescent protein expression in thalamic neurons and reconstructions of biocytin-labeled cortical neurons in TC slices to quantify the number and distribution of boutons from the ventral posterior medial (VPM) and posteromedial (POm) nuclei potentially innervating dendritic arbors of excitatory neurons located in layers (L)2-6 of a cortical column in rat somatosensory cortex. We found that 1) all types of excitatory neurons potentially receive substantial TC input (90-580 boutons per neuron); 2) pyramidal neurons in L3-L6 receive dual TC input from both VPM and POm that is potentially of equal magnitude for thick-tufted L5 pyramidal neurons (ca. 300 boutons each from VPM and POm); 3) L3, L4, and L5 pyramidal neurons have multiple (2-4) subcellular TC innervation domains that match the dendritic compartments of pyramidal cells; and 4) a subtype of thick-tufted L5 pyramidal neurons has an additional VPM innervation domain in L4. The multiple subcellular TC innervation domains of L5 pyramidal neurons may partly explain their specific action potential patterns observed in vivo. We conclude that the substantial potential TC innervation of all excitatory neuron types in a cortical column constitutes an anatomical basis for the initial near-simultaneous representation of a sensory stimulus in different neuron types.

  18. Cardiac autonomic neuropathy in patients with diabetes mellitus.

    Science.gov (United States)

    Dimitropoulos, Gerasimos; Tahrani, Abd A; Stevens, Martin J

    2014-02-15

    Cardiac autonomic neuropathy (CAN) is an often overlooked and common complication of diabetes mellitus. CAN is associated with increased cardiovascular morbidity and mortality. The pathogenesis of CAN is complex and involves a cascade of pathways activated by hyperglycaemia resulting in neuronal ischaemia and cellular death. In addition, autoimmune and genetic factors are involved in the development of CAN. CAN might be subclinical for several years until the patient develops resting tachycardia, exercise intolerance, postural hypotension, cardiac dysfunction and diabetic cardiomyopathy. During its sub-clinical phase, heart rate variability that is influenced by the balance between parasympathetic and sympathetic tones can help in detecting CAN before the disease is symptomatic. Newer imaging techniques (such as scintigraphy) have allowed earlier detection of CAN in the pre-clinical phase and allowed better assessment of the sympathetic nervous system. One of the main difficulties in CAN research is the lack of a universally accepted definition of CAN; however, the Toronto Consensus Panel on Diabetic Neuropathy has recently issued guidance for the diagnosis and staging of CAN, and also proposed screening for CAN in patients with diabetes mellitus. A major challenge, however, is the lack of specific treatment to slow the progression or prevent the development of CAN. Lifestyle changes, improved metabolic control might prevent or slow the progression of CAN. Reversal will require combination of these treatments with new targeted therapeutic approaches. The aim of this article is to review the latest evidence regarding the epidemiology, pathogenesis, manifestations, diagnosis and treatment for CAN.

  19. Brain renin angiotensin system in cardiac hypertrophy and failure

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    Luciana eCampos

    2012-01-01

    Full Text Available Brain renin-angiotensin system (RAS is significantly involved in the roles of the endocrine RAS in cardiovascular regulation. Our studies indicate that the brain RAS participates in the development of cardiac hypertrophy and fibrosis through sympathetic activation. Inhibition of sympathetic hyperactivity after myocardial infarction through suppression of the brain RAS appears beneficial. The brain RAS is involved in the modulation of circadian rhythms of arterial pressure, contributing to nondipping hypertension. We conclude that the brain RAS in pathophysiological states interacts synergistically with the chronically overactive RAS through a positive biofeedbac