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Sample records for adenosine deaminase ada

  1. CSF ADENOSINE DEAMINASE (ADA ACTIVITY IN PATIENTS WITH MENINGITIS

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    Justin

    2016-05-01

    Full Text Available Meningitis is inflammation of the meninges (pia, arachnoid and dura mater covering the brain and the spinal cord. ADA is an enzyme in the purine salvage pathway which is found in abundance in active T-lymphocytes. Hence, an attempt was made to estimate the CSF ADA level in patients with suspected meningitis and throw light on its use in differentiating the various types of meningitis. AIMS AND OBJECTIVES To estimate the level of CSF adenosine deaminase level in different types of meningitis. To assess its usefulness in differentiating the various types (bacterial, viral and tuberculous of meningitis. MATERIALS AND METHODS The study was conducted at the medical wards of Govt. Rajaji Hospital, Madurai, a prospective analytical study from a period of April 2012 to September 2012. OBSERVATION AND RESULTS Tuberculous meningitis occurred more in the age group of 21–40 years. Bacterial meningitis was seen mainly in patients < 20 years of age. Viral meningitis was seen in all age groups. CSF ADA level was highest in tuberculous meningitis, the mean value being 24.5 U/L. The mean value of ADA in bacterial meningitis was 4.54 U/L and viral meningitis patients had lowest mean ADA value of 2.65 U/L. CONCLUSION In our study, 50 patients with meningitis admitted in Government Rajaji Hospital from April 2012 to September 2012 were evaluated. Meningitis predominantly affected people in the age group of 20-40 years in our study with a male: female ratio of 1.9:1. Cases of tuberculous meningitis constituted 48% of the study group and bacterial and viral meningitis were 26% each. CSF protein values were higher and sugar values lower in patients with tuberculous and bacterial meningitis. CSF cell counts were higher in patients with bacterial meningitis.

  2. Platelet aggregation and serum adenosine deaminase (ADA) activity in pregnancy associated with diabetes, hypertension and HIV.

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    Leal, Claudio A M; Leal, Daniela B R; Adefegha, Stephen A; Morsch, Vera M; da Silva, José E P; Rezer, João F P; Schrekker, Clarissa M L; Abdalla, Faida H; Schetinger, Maria R C

    2016-07-01

    Platelet aggregation and adenosine deaminase (ADA) activity were evaluated in pregnant women living with some disease conditions including hypertension, diabetes mellitus and human immunodeficiency virus infection. The subject population is consisted of 15 non-pregnant healthy women [control group (CG)], 15 women with normal pregnancy (NP), 7 women with hypertensive pregnancy (HP), 10 women with gestational diabetes mellitus (GDM) and 12 women with human immunodeficiency virus-infected pregnancy (HIP) groups. The aggregation of platelets was checked using an optical aggregometer, and serum ADA activity was determined using the colorimetric method. After the addition of 5 µM of agonist adenosine diphosphate, the percentage of platelet aggregation was significantly (p pregnancy and pregnancy-associated diseases suggest that platelet aggregation and ADA activity could serve as peripheral markers for the development of effective therapy in the maintenance of homeostasis and some inflammatory process in these pathophysiological conditions. Copyright © 2016 John Wiley & Sons, Ltd.

  3. How We Manage Adenosine Deaminase-Deficient Severe Combined Immune Deficiency (ADA SCID).

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    Kohn, Donald B; Gaspar, H Bobby

    2017-02-14

    Adenosine deaminase-deficient severe combined immune deficiency (ADA SCID) accounts for 10-15% of cases of human SCID. From what was once a uniformly fatal disease, the prognosis for infants with ADA SCID has improved greatly based on the development of multiple therapeutic options, coupled with more frequent early diagnosis due to implementation of newborn screening for SCID. We review the various treatment approaches for ADA SCID including allogeneic hematopoietic stem cell transplantation (HSCT) from a human leukocyte antigen-matched sibling or family member or from a matched unrelated donor or a haplo-identical donor, autologous HSCT with gene correction of the hematopoietic stem cells (gene therapy-GT), and enzyme replacement therapy (ERT) with polyethylene glycol-conjugated adenosine deaminase. Based on growing evidence of safety and efficacy from GT, we propose a treatment algorithm for patients with ADA SCID that recommends HSCT from a matched family donor, when available, as a first choice, followed by GT as the next option, with allogeneic HSCT from an unrelated or haplo-identical donor or long-term ERT as other options.

  4. Autoimmune dysregulation and purine metabolism in adenosine deaminase (ADA-deficiency

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    Aisha Vanessa Sauer

    2012-08-01

    Full Text Available Genetic defects in the adenosine deaminase (ADA gene are among the most common causes for severe combined immunodeficiency (SCID. ADA-SCID patients suffer from lymphopenia, severely impaired cellular and humoral immunity, failure to thrive and recurrent infections. Currently available therapeutic options for this otherwise fatal disorder include bone marrow transplantation (BMT, enzyme replacement therapy with bovine ADA (PEG-ADA or hematopoietic stem cell gene therapy (HSC-GT. Although varying degrees of immune reconstitution can be achieved by these treatments, breakdown of tolerance is a major concern in ADA-SCID. Immune dysregulation such as autoimmune hypothyroidism, diabetes mellitus, hemolytic anemia, and immune thrombocytopenia are frequently observed in milder forms of the disease. However, several reports document similar complications also in patients on long-term PEG-ADA and after BMT or GT treatment.A skewed repertoire and decreased immune functions have been implicated in autoimmunity observed in certain B-cell and/or T-cell immunodeficiencies, but it remains unclear to what extent specific mechanisms of tolerance are affected in ADA deficiency. Herein we provide an overview about ADA-SCID and the autoimmune manifestations reported in these patients before and after treatment. We also assess the value of the ADA-deficient mouse model as a useful tool to study both immune and metabolic disease mechanisms. With focus on regulatory T and B cells we discuss the lymphocyte subpopulations particularly prone to contribute to the loss of self-tolerance and onset of autoimmunity in ADA deficiency. Moreover we address which aspects of immune dysregulation are specifically related to alterations in purine metabolism caused by the lack of ADA and the subsequent accumulation of metabolites with immunomodulatory properties.

  5. Hyperbilirubinemia and rapid fatal hepatic failure in severe combined immunodeficiency caused by adenosine deaminase deficiency (ADA-SCID).

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    Kühl, J S; Schwarz, K; Münch, A; Schmugge, M; Pekrun, A; Meisel, C; Wahn, V; Ebell, W; von Bernuth, H

    2011-03-01

    Adenosin deaminase (ADA) deficiency is the cause for Severe Combined Immunodeficiency (SCID) in about 15% of patients with SCID, often presenting as T (-)B (-)NK (-)SCID. Treatment options for ADA-SCID are enzyme replacement, bone marrow transplantation or gene therapy. We here describe the first patient with ADA-SCID and fatal hepatic failure despite bone marrow transplantation from a 10/10 HLA identical related donor. As patients with ADA-SCID may be at yet underestimated increased risk for rapid hepatic failure we speculate whether hepatitis in ADA-SCID should lead to the immediate treatment with enzyme replacement by pegylated ADA.

  6. Seed specific expression and analysis of recombinant human adenosine deaminase (hADA) in three host plant species.

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    Doshi, Ketan M; Loukanina, Natalia N; Polowick, Patricia L; Holbrook, Larry A

    2016-10-01

    The plant seed is a leading platform amongst plant-based storage systems for the production of recombinant proteins. In this study, we compared the activity of human adenosine deaminase (hADA) expressed in transgenic seeds of three different plant species: pea (Pisum sativum L.), Nicotiana benthamiana L. and tarwi (Lupinus mutabilis Sweet). All three species were transformed with the same expression vector containing the hADA gene driven by the seed-specific promoter LegA2 with an apoplast targeting pinII signal peptide. During the study, several independent transgenic lines were generated and screened from each plant species and only lines with a single copy of the gene of interest were used for hADA expression analysis. A stable transgenic canola line expressing the ADA protein, under the control of 35S constitutive promoter was used as both as a positive control and for comparative study with the seed specific promoter. Significant differences were detected in the expression of hADA. The highest activity of the hADA enzyme (Units/g seed) was reported in tarwi (4.26 U/g) followed by pea (3.23 U/g) and Nicotiana benthamiana (1.69 U/g). The expression of mouse ADA in canola was very low in both seed and leaf tissue compared to other host plants, confirming higher activity of seed specific promoter. Altogether, these results suggest that tarwi could be an excellent candidate for the production of valuable recombinant proteins.

  7. Utility of adenosine deaminase (ADA, PCR & thoracoscopy in differentiating tuberculous & non-tuberculous pleural effusion complicating chronic kidney disease

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    Sravan Kumar

    2015-01-01

    Full Text Available Background & objectives: Pleural effusion is a common occurrence in patients with late-stage chronic kidney disease (CKD. In developing countries, many effusions remain undiagnosed after pleural fluid analysis (PFA and patients are empirically treated with antitubercular therapy. The aim of this study was to evaluate the role of adenosine deaminase (ADA, nucleic acid amplification tests (NAAT and medical thoracoscopy in distinguishing tubercular and non-tubercular aetiologies in exudative pleural effusions complicating CKD. Methods: Consecutive stage 4 and 5 CKD patients with pleural effusions underwent PFA including ADA and PCR [65 kDa gene; multiplex (IS6110, protein antigen b, MPB64]. Patients with exudative pleural effusion undiagnosed after PFA underwent medical thoracoscopy. Results: All 107 patients underwent thoracocentesis with 45 and 62 patients diagnosed as transudative and exudative pleural effusions, respectively. Twenty six of the 62 patients underwent medical thoracoscopy. Tuberculous pleurisy was diagnosed in six while uraemic pleuritis was diagnosed in 20 subjects. The sensitivity and specificity of pleural fluid ADA, 65 kDa gene PCR, and multiplex PCR were 66.7 and 90 per cent, 100 and 50 per cent, and 100 and 100 per cent, respectively. Thoracoscopy was associated with five complications in three patients. Interpretation & conclusions: Uraemia remains the most common cause of pleural effusion in CKD even in high TB prevalence country. Multiplex PCR and thoracoscopy are useful investigations in the diagnostic work-up of pleural effusions complicating CKD while the sensitivity and/or specificity of ADA and 65 kDa gene PCR is poor.

  8. Carrier frequency of a nonsense mutation in the adenosine deaminase (ADA) gene implies a high incidence of ADA-deficient severe combined immunodeficiency (SCID) in Somalia and a single, common haplotype indicates common ancestry.

    Science.gov (United States)

    Sanchez, Juan J; Monaghan, Gemma; Børsting, Claus; Norbury, Gail; Morling, Niels; Gaspar, H Bobby

    2007-05-01

    Inherited adenosine deaminase (ADA) deficiency is a rare metabolic disorder that causes immunodeficiency, varying from severe combined immunodeficiency (SCID) in the majority of cases to a less severe form in a small minority of patients. Five patients of Somali origin from four unrelated families, with severe ADA-SCID, were registered in the Greater London area. Patients and their parents were investigated for the nonsense mutation Q3X (ADA c7C>T), two missense mutations K80R (ADA c239A>G) and R142Q (ADA c425G>A), and a TAAA repeat located at the 3' end of an Alu element (AluVpA) positioned 1.1 kb upstream of the ADA transcription start site. All patients were homozygous for the haplotype ADA-7T/ADA-239G/ADA-425G/AluVpA7. Among 207 Somali immigrants to Denmark, the frequency of ADA c7C>T and the maximum likelihood estimate of the frequency of the haplotype ADA-7T/ADA-239G/ADA-425G/AluVpA7 were both 0.012 (carrier frequency 2.4%). Based on the analysis of AluVpA alleles, the ADA c7C/T mutation was estimated to be approximately 7,100 years old. Approximately 1 out of 5 - 10000 Somali children will be born with ADA deficiency due to an ADA c7C/T mutation, although within certain clans the frequency may be significantly higher. ADA-SCID may be a frequent immunodeficiency disorder in Somalia, but will be underdiagnosed due to the prevailing socioeconomic and nutritional deprivation.

  9. Adenosine Deaminase Deficiency – More Than Just an Immunodeficiency

    OpenAIRE

    Kathryn Victoria Whitmore; Hubert Bobby Gaspar

    2016-01-01

    Adenosine deaminase (ADA) deficiency is best known as a form of severe combined immunodeficiency (SCID) which results from mutations in the gene encoding adenosine deaminase. Affected patients present with clinical and immunological manifestations typical of a severe combined immunodeficiency. Therapies are currently available that can that target these immunological disturbances and treated patients show varying degrees of clinical improvement. However, there is now a growing body of evidenc...

  10. Homozygosity for a novel adenosine deaminase (ADA) nonsense mutation (Q3>X) in a child with severe combined immunodeficiency (SCID)

    Energy Technology Data Exchange (ETDEWEB)

    Santisteban, I.; Arrendondo-Vega, F.X.; Kelly, S. [Duke Univ. Medical Center, Durham, NC (United States)]|[Hospital for Sick Children, Ontario (Canada)] [and others

    1994-09-01

    A Somali girl was diagnosed with ADA-deficient SCID at 7 mo; she responded well to PEG-ADA replacement and is now 3.3 yr old. ADA mRNA was undetectable (Northern) in her cultured T cells, but was present in T cells of her parents and two sibs. All PCR-amplified exon 1 genomic clones from the patient had a C>T transition at bp 7 relative to the start of translation, replacing Gln at codon 3 (AGA) with a termination codon (TGA, Q3>X). Patient cDNA (prepared by RT-PCR with a 5{prime} primer that covered codons 1-7) had a previously described polymorphism, K80>R, but was otherwise normal, indicating that no other coding mutations were present. A predicted new genomic BfaI restriction site was used to establish her homozygosity for Q3>X and to analyze genotypes of family members. We also analyzed the segregation of a variable Alu polyA-associated TAAA repeat (AluVpA) situated 5{prime} of the ADA gene. Three different AluVpA alleles were found, one of which was only present in the father and was not associated with his Q3>X allele. Because the father`s RBCs had only {approximately}15% of normal ADA activity, we analyzed his ADA cDNA. We found a G>A transition at bp 425 that substitutes Gln for Arg142, a solvent-accessible residue, and eliminates a BsmAI site in exon 5. ADA activity of the R142>Q in vitro translation product was 20-25% of wild type ADA translation product, suggesting that R142>Q is a new {open_quote}partial{close_quote} ADA deficiency mutation. As expected, Q3>X mRNA did not yield a detectable in vitro translation product. We conclude that the patient`s father is a compound heterozygote carrying the ADA Q3>X/R142>Q genotype. {open_quote}Partial{close_quote} ADA deficiency unassociated with immunodeficiency is relatively common in individuals of African descent. The present findings and previous observations suggest that {open_quote}partial{close_quote} ADA deficiency may have had an evolutionary advantage.

  11. 腺苷脱氨酶2与血管炎的相关性研究进展%Research Progress of Correlation between Adenosine Deaminase 2 (ADA2) and Vasculitis

    Institute of Scientific and Technical Information of China (English)

    鞠俊; 邹丽萍

    2014-01-01

    血管炎性病变临床表现多样,病因复杂。新近研究发现,部分血管炎性病变可能与猫眼综合征染色体候选基因1(cat eye syndrome chromosome region,candidate 1,CECR1)突变导致CECR1基因编码的腺苷脱氨酶2(adenosine deaminase 2,ADA2)功能缺陷相关。多项研究在结节性多动脉炎和不能明确诊断的血管炎性疾病患者中发现了相同的突变位点,并证实了存在ADA2蛋白功能缺陷。作为腺嘌呤核苷代谢过程中的腺苷脱氨酶(adenosine deaminase,ADA)亚型之一的ADA2不论在早期胚胎发育,还是在特异性免疫系统中都发挥了作用,但目前对于ADA2的功能研究较少。推测ADA2缺陷可能通过增加腺苷水平和破坏血管内皮的完整性从而导致血管炎症的发生,机制尚待进一步研究。总之, ADA2缺陷可能揭示了ADA在人类疾病中的作用,为血管炎性疾病提供了诊断和治疗策略,现对其与血管炎的相关性研究做一综述,以期从遗传学角度探讨血管炎的病因。%The manifestations of vasculitis and vasculopathy are highly varied and have complicated etiology. Recent studies found that part of patients with vasculitis and vasculopathy may be associated with carrying recessively inherited gene mutation inCECR1 (cat eye syndrome chromosome region, candidate 1), encoding adenosine deaminase 2 (ADA2), which resulted in loss of function. The same mutations inCECR1 were found in patients with polyarteritis and vasculitis without being speciifcally deifned in different research, and deifciency of ADA2 was conifrmed. As one of adenosine deaminases (ADA), ADA2 functions in adenosine metabolism, and plays an important role both in early embryonic development and in immune system, but at present there is little study in function of ADA2. It is speculated that ADA2 deifciency induces vasculitis through adenosine increase and destruction of vascular endothelial integrity. The

  12. Diagnostic Value of Adenosine Deaminase and Its Isoforms in Type II Diabetes Mellitus

    OpenAIRE

    Bagher Larijani; Ramin Heshmat; Mina Ebrahimi-Rad; Shohreh Khatami; Shirin Valadbeigi; Reza Saghiri

    2016-01-01

    Background and Aims. In the present study, we have investigated the activity of adenosine deaminase (ADA) as a diagnostic marker in type 2 (or II) diabetes mellitus (T2DM). Design and Methods. The deaminase activity of ADA1 and ADA2 was determined in serum from 33 patients with type 2 (or II) diabetes mellitus and 35 healthy controls. We also determined the proportion of glycated hemoglobin (HbA1c). Results. Our results showed significant differences between total serum ADA (tADA) and ADA2 ac...

  13. Adenosine Deaminase Deficiency - More Than Just an Immunodeficiency

    Directory of Open Access Journals (Sweden)

    Kathryn Victoria Whitmore

    2016-08-01

    Full Text Available Adenosine deaminase (ADA deficiency is best known as a form of severe combined immunodeficiency (SCID which results from mutations in the gene encoding adenosine deaminase. Affected patients present with clinical and immunological manifestations typical of a severe combined immunodeficiency. Therapies are currently available that can that target these immunological disturbances and treated patients show varying degrees of clinical improvement. However, there is now a growing body of evidence that deficiency of ADA has significant impact on non-immunological organ systems. This review will outline the impact of ADA deficiency on various organ systems, starting with the well understood immunological abnormalities. We will discuss possible pathogenic mechanisms and also highlight ways in which current treatments could be improved. In doing so, we aim to present ADA deficiency as more than an immunodeficiency and suggest that it should be recognized as a systemic metabolic disorder that affects multiple organ systems. Only by fully understanding ADA deficiency and its manifestations in all organ systems can we aim to deliver therapies that will correct all the clinical consequences.

  14. Outcome of hematopoietic stem cell transplantation for adenosine deaminase-deficient severe combined immunodeficiency

    NARCIS (Netherlands)

    Hassan, Amel; Booth, Claire; Brightwell, Alex; Allwood, Zoe; Veys, Paul; Rao, Kanchan; Hoenig, Manfred; Friedrich, Wilhelm; Gennery, Andrew; Slatter, Mary; Bredius, Robbert; Finocchi, Andrea; Cancrini, Caterina; Aiuti, Alessandro; Porta, Fulvio; Lanfranchi, Arnalda; Ridella, Michela; Steward, Colin; Filipovich, Alexandra; Marsh, Rebecca; Bordon, Victoria; Al-Muhsen, Saleh; Al-Mousa, Hamoud; Alsum, Zobaida; Al-Dhekri, Hasan; Al Ghonaium, Abdulaziz; Speckmann, Carsten; Fischer, Alain; Mahlaoui, Nizar; Nichols, Kim E.; Grunebaum, Eyal; Al Zahrani, Daifulah; Roifman, Chaim M.; Boelens, Jaap; Davies, E. Graham; Cavazzana-Calvo, Marina; Notarangelo, Luigi; Gaspar, H. Bobby

    2012-01-01

    Deficiency of the purine salvage enzyme adenosine deaminase leads to SCID (ADA-SCID). Hematopoietic cell transplantation (HCT) can lead to a permanent cure of SCID; however, little data are available on outcome of HCT for ADA-SCID in particular. In this multicenter retrospective study, we analyzed o

  15. [Adenosine deaminase in experimental trypanosomiasis: future implications].

    Science.gov (United States)

    Pérez-Aguilar, Mary Carmen; Rondón-Mercado, Rocío

    2015-09-01

    The adenosine deaminase represents a control point in the regulation of extracellular adenosine levels, thus playing a critical role in the modulation of purinergic responses to certain pathophysiological events. Several studies have shown that serum and plasma enzyme levels are elevated in some diseases caused by microorganisms, which may represent a compensatory mechanism due to the elevated levels of adenosine and the release of inflammatory mediators. Recent research indicates that adenosine deaminase activity decreases and affects hematological parameters of infected animals with Trypanosoma evansi, so that such alterations could have implications in the pathogenesis of the disease. In addition, the enzyme has been detected in this parasite; allowing the inference that it could be associated with the vital functions of the same, similar to what occurs in mammals. This knowledge may be useful in the association of chemotherapy with specific inhibitors of the enzyme in future studies.

  16. Late-onset adenosine deaminase deficiency presenting with Heck's disease.

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    Artac, Hasibe; Göktürk, Bahar; Bozdemir, Sefika Elmas; Toy, Hatice; van der Burg, Mirjam; Santisteban, Ines; Hershfield, Michael; Reisli, Ismail

    2010-08-01

    Focal epithelial hyperplasia, also known as Heck's disease, is a rare but distinctive entity of viral etiology with characteristic clinical and histopathological features. It is a benign, asymptomatic disease of the oral mucosa caused by human papilloma viruses (HPV). Previous studies postulated an association between these lesions and immunodeficiency. Genetic deficiency of adenosine deaminase (ADA) results in varying degrees of immunodeficiency, including neonatal onset severe combined immunodeficiency (ADA-SCID), and milder, later onset immunodeficiency. We report a 12-year-old girl with the late onset-ADA deficiency presenting with Heck's disease. Our case report should draw attention to the possibility of immunodeficiency in patients with HPV-induced focal epithelial hyperplasia.

  17. Lower frequency of the low activity adenosine deaminase allelic variant (ADA1*2 in schizophrenic patients Diminuição da frequência da variante alélica de baixa atividade da adenosina desaminase (ADA1*2 em pacientes esquizofrênicos

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    Gustavo Pimentel Dutra

    2010-09-01

    Full Text Available OBJECTIVE: Adenosine may play a role in the pathophysiology of schizophrenia, since it modulates the release of several neurotransmitters such as glutamate, dopamine, serotonin and acetylcholine, decreases neuronal activity by pos-synaptic hyperpolarization and inhibits dopaminergic activity. Adenosine deaminase participates in purine metabolism by converting adenosine into inosine. The most frequent functional polymorphism of adenosine deaminase (22G→A (ADA1*2 exhibits 20-30% lower enzymatic activity in individuals with the G/A genotype than individuals with the G/G genotype. The aim of this study was to evaluate the ADA polymorphism 22G→A (ADA1*2 in schizophrenic patients and healthy controls. METHOD: The genotypes of the ADA 22G→A were identified with allele-specific PCR strategy in 152 schizophrenic patients and 111 healthy individuals. RESULTS: A significant decrease in the frequency of the G/A genotype was seen in schizophrenic patients (7/152 - 4.6% relative to controls (13/111 - 11.7%, p = 0.032, OR = 2.6. CONCLUSION: These results suggest that the G/A genotype associated with low adenosine deaminase activity and, supposingly, with higher adenosine levels is less frequent among schizophrenic patients.OBJETIVO: A adenosina pode ter um papel importante na fisiopatologia da esquizofrenia, uma vez que modula a liberação de vários neurotransmissores, tais como glutamato, dopamina, serotonina e acetilcolina, diminui a atividade neuronal por hiperpolarização pós-sináptica e inibe a atividade dopaminérgica. A adenosina desaminase participa do metabolismo das purinas pela conversão de adenosina em inosina. O mais frequente polimorfismo funcional da adenosina desaminase (22G →A (ADA1*2 exibe uma diminuição de 20-30% da atividade funcional em indivíduos com genótipo G/A quando comparados com indivíduos com o genótipo G/G. O objetivo deste estudo foi avaliar o polimorfismo 22G→A (ADA1*2 em pacientes esquizofrênicos e em

  18. COMPARISION OF ADENOSINE DEAMINASE [ADA] LEVELS WITH CYTO-CHEMICAL ANALYSIS OF PLEURAL FLUIDS TO DIFFERENTIATE TUBERCULAR AND NON â TUBERCULAR EFFUSIONS

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    Choukimath M Sharanabasav

    2013-12-01

    Full Text Available This study is intended to utilize biochemical parameters like ADA and protein levels in comparison with cell count and cell type in pleural fluid to differentiate tubercular and non-tubercular effusions. We have analyzed a total of 208 cases and among them 59.61% cases were ADA positive and 40.39% cases were ADA negative, and 156 cases were exudates and 52 cases were transudates. Categorized these effusions into 4 groups taking consideration of ADA, cell count, lymphocyte and protein levels as exudate with ADA positive, exudate with ADA negative, transudate with ADA positive and transudate with ADA negative. This study has shown promising results to diagnose tuberculosis with immediate and cost effectiveness that can be undertaken by any basic laboratory, in a endemic areas and developing countries like India

  19. Primary adenosine monophosphate (AMP) deaminase deficiency in a hypotonic infant.

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    Castro-Gago, Manuel; Gómez-Lado, Carmen; Pérez-Gay, Laura; Eirís-Puñal, Jesús; Martínez, Elena Pintos; García-Consuegra, Inés; Martín, Miguel Angel

    2011-06-01

    The spectrum of the adenosine monophosphate (AMP) deaminase deficiency ranges from asymptomatic carriers to patients who manifest exercise-induced muscle pain, occasionally rhabdomyolysis, and idiopathic hyperCKemia. However, previous to the introduction of molecular techniques, rare cases with congenital weakness and hypotonia have also been reported. We report a 6-month-old girl with the association of congenital muscle weakness and hypotonia, muscle deficiency of adenosine monophosphate deaminase, and the homozygous C to T mutation at nucleotide 34 of the adenosine monophosphate deaminase-1 gene. This observation indicates the possible existence of a primary adenosine monophosphate deaminase deficiency manifested by congenital muscle weakness and hypotonia.

  20. B-cell development and functions and therapeutic options in adenosine deaminase-deficient patients

    NARCIS (Netherlands)

    I. Brigida (Immacolata); A.V. Sauer (Aisha); F. Ferrua (Francesca); S. Giannelli (Stefania); S. Scaramuzza (Samantha); V. Pistoia (Valentina); M.C. Castiello (Maria Carmina); B.H. Barendregt (Barbara); M.P. Cicalese (Maria Pia); F. Casiraghi (Federica); C. Brombin (Chiara); J. Puck (Jennifer); K. Muller (Karin); L.D. Notarangelo (Luigi Daniele); D. Montin (Davide); J.M. van Montfrans (Joris); M.G. Roncarolo (Maria Grazia); E. Traggiai (Elisabetta); J.J.M. van Dongen (Jacques); M. van der Burg (Mirjam); A. Aiuti (Alessandro)

    2014-01-01

    textabstractBackground Adenosine deaminase (ADA) deficiency causes severe cellular and humoral immune defects and dysregulation because of metabolic toxicity. Alterations in B-cell development and function have been poorly studied. Enzyme replacement therapy (ERT) and hematopoietic stem cell (HSC) g

  1. Gene therapy for severe combined immunodeficiency due to adenosine deaminase deficiency.

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    Montiel-Equihua, Claudia A; Thrasher, Adrian J; Gaspar, H Bobby

    2012-02-01

    The severe combined immunodeficiency caused by the absence of adenosine deaminase (SCID-ADA) was the first monogenic disorder for which gene therapy was developed. Over 30 patients have been treated worldwide using the current protocols, and most of them have experienced clinical benefit; importantly, in the absence of any vector-related complications. In this document, we review the progress made so far in the development and establishment of gene therapy as an alternative form of treatment for ADA-SCID patients.

  2. Carrier frequency of a nonsense mutation in the adenosine deaminase (ADA) gene implies a high incidence of ADA-deficient severe combined immunodeficiency (SCID) in Somalia and a single, common haplotype indicates common ancestry

    DEFF Research Database (Denmark)

    Sanchez Sanchez, Juan Jose; Monaghan, Gemma; Børsting, Claus

    2007-01-01

    , with severe ADA-SCID, were registered in the Greater London area. Patients and their parents were investigated for the nonsense mutation Q3X (ADA c7C>T), two missense mutations K80R (ADA c239A>G) and R142Q (ADA c425G>A), and a TAAA repeat located at the 3' end of an Alu element (AluVpA) positioned 1.1 kb...

  3. Adenosine deaminase activity in serum and lymphocytes of rats infected with Sporothrix schenckii.

    Science.gov (United States)

    Castro, Verônica S P; Pimentel, Victor C; Da Silva, Aleksandro S; Thomé, Gustavo R; Wolkmer, Patrícia; Castro, Jorge L C; Costa, Márcio M; da Silva, Cássia B; Oliveira, Daniele C; Alves, Sydney H; Schetinger, Maria R C; Lopes, Sonia T A; Mazzanti, Cinthia M

    2012-07-01

    Sporotrichosis is a fungal infection of subcutaneous or chronic evolution, inflammatory lesions characterized by their pyogranulomatous aspect, caused by the dimorphic fungus Sporothrix schenckii. Adenosine deaminase (ADA) is a "key" enzyme in the purine metabolism, promoting the deamination of adenosine, an important anti-inflammatory molecule. The increase in ADA activity has been demonstrated in several inflammatory conditions; however, there are no data in the literature associated with this fungal infection. The objective of this study was to evaluate the activity of serum ADA (S-ADA) and lymphocytes (L-ADA) of rats infected with S. schenckii. We used seventy-eight rats divided into two groups. In the first experiment, rats were infected subcutaneously and in the second experiment, infected intraperitoneally. Blood samples for hematologic evaluation and activities of S-ADA and L-ADA were performed at days 15, 30, and 40 post-infection (PI) to assess disease progression. In the second experiment, it was observed an acute decrease in activity of S-ADA and L-ADA (P schenckii alters the activities of S-ADA in experimentally infected rats, demonstrating the involvement of this enzyme in the pathogenesis of sporotrichosis.

  4. Development of gene therapy: potential in severe combined immunodeficiency due to adenosine deaminase deficiency.

    OpenAIRE

    Montiel-Equihua, C. A.; Thrasher, A. J.; Gaspar, H B

    2009-01-01

    The history of stem cell gene therapy is strongly linked to the development of gene therapy for severe combined immunodeficiencies (SCID) and especially adenosine deaminase (ADA)-deficient SCID. Here we discuss the developments achieved in over two decades of clinical and laboratory research that led to the establishment of a protocol for the autologous transplant of retroviral vector-mediated gene-modified hematopoietic stem cells, which has proved to be both successful and, to date, safe. P...

  5. The influence of age and gender to adenosine deaminase value%年龄及性别对腺苷脱氨酶(ADA)测定值的影响

    Institute of Scientific and Technical Information of China (English)

    池继敏; 邹明

    2011-01-01

    目的 探讨年龄及性别因素对腺苷脱氨酶测定值的影响.方法 收集我院近3年来共计24163例腺苷脱氨酶检测数据,分别统计其在不同年龄段和不同性别条件下的均值和标准差,并对结果进行统计分析.结果 腺苷脱氨酶测定值与年龄具有线性相关性(P<0.05),且同一年龄段男女测定值比较差异有统计学意义(P<0.05).结论 腺苷脱氨酶测定值受年龄的影响:30岁前为负相关,30岁后为正相关;同时受性别的影响:儿童期基本无差异,中青年期男性高于女性,老年期女性高于男性.%Objective To investigate the influence of age and gender to adenosine deaminase value. Methods The adenosine deaminase values of 24 163 cases for the past three years were collected in our hospital. Mean values and standard deviations were calculated according to the ages and the sex individually. The statistical analysis of the results was performed using the software. Results The adenosine deaminase values and the age showed the linear relationship ( P < 0. 05 ). The values of male and female in the same age section were different, which was significant ( P < 0. 05 ). Conclusion Adenosine deaminase values were influenced by the ages. There was a negative correlation between the two before 30 years old. There was a positive correlation after 30 years old. At the same time, the values were related with the gender. The values had no difference during childhood. The male's were higher than the female's during the adolescence and the middle age. While the female's were higher than male's during the old age.

  6. Comparison of interferon-gamma release assays and adenosine deaminase of pleural fluid for the diagnosis of pleural tuberculosis

    Institute of Scientific and Technical Information of China (English)

    刘菲

    2014-01-01

    Objective To compare the diagnostic performance of interferon gamma releasing assays(T-SPOT.TB)and adenosine deaminase(ADA)in pleural tuberculosis,and therefore to evaluate the value of T-SPOT.TB in a high tuberculosis burden country.Methods From June 2011to November 2012,111 patients with pleural fluid in Beijing Chest Hospital,Capital Medical University were

  7. Effects of an induced adenosine deaminase deficiency on T-cell differentiation in the rat

    Energy Technology Data Exchange (ETDEWEB)

    Barton, R.W.

    1985-10-15

    Inherited deficiency of the enzyme adenosine deaminase (ADA) has been found in a significant proportion of patients with severe combined immunodeficiency disease and inherited defect generally characterized by a deficiency of both B and T cells. Two questions are central to understanding the pathophysiology of this disease: (1) at what stage or stages in lymphocyte development are the effects of the enzyme deficiency manifested; (2) what are the biochemical mechanisms responsible for the selective pathogenicity of the lymphoid system. We have examined the stage or stages of rat T-cell development in vivo which are affected by an induced adenosine deaminase deficiency using the ADA inhibitors, erythro-9-(2-hydroxy-3-nonyl)adenine (EHNA) and 2'-deoxycoformycin (DCF). In normal rats given daily administration of an ADA inhibitor, cortical thymocytes were markedly depleted; peripheral lymphocytes and pluripotent hemopoietic stem cells (CFU-S) all were relatively unaffected. Since a deficiency of ADA affects lymphocyte development, the regeneration of cortical and medullary thymocytes and their precursors after sublethal irradiation was used as a model of lymphoid development. By Day 5 after irradiation the thymus was reduced to 0.10-0.5% of its normal size; whereas at Days 9 and 14 the thymus was 20-40% and 60-80% regenerated, respectively. When irradiated rats were given daily parenteral injections of the ADA inhibitor plus adenosine or deoxyadenosine, thymus regeneration at Days 9 and 14 was markedly inhibited, whereas the regeneration of thymocyte precursors was essentially unaffected. Thymus regeneration was at least 40-fold lower than in rats given adenosine or deoxyadenosine alone. Virtually identical results were obtained with both ADA inhibitors, EHNA and DCF.

  8. Expression of Drosophila adenosine deaminase in immune cells during inflammatory response.

    Science.gov (United States)

    Novakova, Milena; Dolezal, Tomas

    2011-03-11

    Extra-cellular adenosine is an important regulator of inflammatory responses. It is generated from released ATP by a cascade of ectoenzymes and degraded by adenosine deaminase (ADA). There are two types of enzymes with ADA activity: ADA1 and ADGF/ADA2. ADA2 activity originates from macrophages and dendritic cells and is associated with inflammatory responses in humans and rats. Drosophila possesses a family of six ADGF proteins with ADGF-A being the main regulator of extra-cellular adenosine during larval stages. Herein we present the generation of a GFP reporter for ADGF-A expression by a precise replacement of the ADGF-A coding sequence with GFP using homologous recombination. We show that the reporter is specifically expressed in aggregating hemocytes (Drosophila immune cells) forming melanotic capsules; a characteristic of inflammatory response. Our vital reporter thus confirms ADA expression in sites of inflammation in vivo and demonstrates that the requirement for ADA activity during inflammatory response is evolutionary conserved from insects to vertebrates. Our results also suggest that ADA activity is achieved specifically within sites of inflammation by an uncharacterized post-transcriptional regulation based mechanism. Utilizing various mutants that induce melanotic capsule formation and also a real immune challenge provided by parasitic wasps, we show that the acute expression of the ADGF-A protein is not driven by one specific signaling cascade but is rather associated with the behavior of immune cells during the general inflammatory response. Connecting the exclusive expression of ADGF-A within sites of inflammation, as presented here, with the release of energy stores when the ADGF-A activity is absent, suggests that extra-cellular adenosine may function as a signal for energy allocation during immune response and that ADGF-A/ADA2 expression in such sites of inflammation may regulate this role.

  9. Elevated erythrocyte adenosine deaminase activity in a patient with primary acquired sideroblastic anemia.

    Science.gov (United States)

    Kanno, H; Fujii, H; Tani, K; Morisaki, T; Takahashi, K; Horiuchi, N; Kizaki, M; Ogawa, T; Miwa, S

    1988-03-01

    We report a case of primary acquired sideroblastic anemia (PASA) associated with elevated erythrocyte adenosine deaminase (ADA) activity. The patient was an 85-year-old Japanese male. Analysis of the peripheral blood revealed pancytopenia, and the bone marrow findings showed marked ringed sideroblasts and chromosomal deletion (46XY, 11q-). The erythrocyte ADA activity was 17 times higher than that of normal control, the leukocyte ADA activity was within the normal range, and the plasma ADA activity was 2 times higher than the normal mean. The adenine nucleotides in the patient's erythrocytes were within normal range. According to starch gel electrophoresis, ADA isozyme of the patient was ADA 1. Western blotting showed an increased amount of ADA protein in the patient's erythrocytes. Southern blotting revealed no gene amplification or large structural change. Dot blot analysis of the reticulocyte mRNA showed no increase in the amount of ADA mRNA in the patient's reticulocytes compared with those of reticulocyte-rich controls. We considered that the mechanism of elevated ADA activity in this acquired defect was similar to that found in hereditary hemolytic anemia associated with ADA overproduction.

  10. Efficient retrovirus-mediated transfer and expression of a human adenosine deaminase gene in diploid skin fibroblasts from an adenosine deaminase-deficient human

    Energy Technology Data Exchange (ETDEWEB)

    Palmer, T.D.; Hock, R.A.; Osborne, W.R.A.; Miller, A.D.

    1987-02-01

    Skin fibroblasts might be considered suitable recipients for therapeutic genes to cure several human genetic diseases; however, these cells are resistant to gene transfer by most methods. The authors studied the ability of retroviral vectors to transfer genes into normal human diploid skin fibroblasts. Retroviruses carrying genes for neomycin or hygromycin B resistance conferred drug resistance to greater than 50% of the human fibroblasts after a single exposure to virus-containing medium. This represents at least a 500-fold increase in efficiency over other methods. Transfer was achieved in the absence of helper virus by using amphotropic retrovirus-packaging cells. A retrovirus vector containing a human adenosine deaminase (ADA) cDNA was constructed and used to infect ADA/sup -/ fibroblasts from a patient with ADA deficiency. The infected cells produced 12-fold more ADA enzyme than fibroblasts from normal individuals and were able to rapidly metabolize exogenous deoxyadenosine and adenosine, metabolites that accumulate in plasma in ADA-deficient patients and are responsible for the severe combined immunodeficiency in these patients. These experiments indicate the potential of retrovirus-mediated gene transfer into human fibroblasts for gene therapy.

  11. Does adenosine deaminase activity play a role in the early diagnosis of ectopic pregnancy?

    Science.gov (United States)

    Turkmen, G G; Karçaaltıncaba, D; Isık, H; Fidancı, V; Kaayalp, D; Tımur, H; Batıoglu, S

    2016-01-01

    Early diagnosis of ectopic pregnancy (EP) is important due to life-threatening consequences in the first trimester of pregnancy. In this study we aimed to investigate the role of adenosine deaminase (ADA) activity in the prediction of EP. Forty-one patients with unruptured ectopic pregnancy comprised the case group and forty-two first trimester pregnant women with shown foetal heart beating in ultrasound comprised the control group. The mean ADA level in EP (10.9 ± 3.0 IU/L) was higher than that in control group (9.2 ± 3.6 IU/L) (p = 0.018). Receiver operating characteristics or ROC curve identified ADA value of 10.95 IU/L as optimal threshold for the prediction of EP with 56% sensitivity and 67% specificity. High ADA levels are valuable in the early diagnosis of EP. However more comprehensive studies are required.

  12. Expression of human adenosine deaminase in mice reconstituted with retrovirus-transduced hematopoietic stem cells

    Energy Technology Data Exchange (ETDEWEB)

    Wilson, J.M.; Danos, O.; Grossman, M.; Raulet, D.H.; Mulligan, R.C. (Massachusetts Institute of Technology, Cambridge (USA))

    1990-01-01

    Recombinant retroviruses encoding human adenosine deaminase have been used to infect murine hematopoietic stem cells. In bone marrow transplant recipients reconstituted with the genetically modified cells, human ADA was detected in peripheral blood mononuclear cells of the recipients for at least 6 months after transplantation. In animals analyzed in detail 4 months after transplantation, human ADA and proviral sequences were detected in all hematopoietic lineages; in several cases, human ADA activity exceeded the endogenous activity. These studies demonstrate the feasibility of introducing a functional human ADA gene into hematopoietic stem cells and obtaining expression in multiple hematopoietic lineages long after transplantation. This approach should be helpful in designing effective gene therapies for severe combined immunodeficiency syndromes in humans.

  13. A Case of Hypogammaglobulinemia with Enteroviral Meningoencephalitis, Associated with Increased Adenosine Deaminase in Cerebrospinal Fluid

    Directory of Open Access Journals (Sweden)

    Alborizi Abdolvahab

    2009-06-01

    Full Text Available We describe the development of enterovirus meningoencephalitis associated with increased adenosine deaminase in cerebrospinal fluid of a 12-year-old boy, a known case of hypogamaglobulinemia despite monthly replacement of IVIg.The patient was referred to our center with fever, headache and vomiting for 10 days. CSF analysis was compatible with aseptic meningoencephalitis but high CSF protein (>200mg/dl and high level of adenosine deaminase in CSF (30IU/L were against the diagnosis of simple viral meningoencephalitis. Nested PCR of CSF for entrovirus was positive. Treatment with daily high-dose IVIg was commenced, with significant clinical improvement. For patients with increased ADA and lymphocytic pleocytosis in CSF, differential diagnoses should include enteroviral meningitis. Antibodies, although crucial, cannot on their own prevent enteroviral infection in some hypogamaglbulinemic patients.

  14. The investigation of Adenosine Deaminase activity in patients with Mycosis Fungoides

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    Yılmaz Ulaş

    2013-12-01

    Full Text Available Aim: Mycosis fungoides (MF is a cutaneous T cell lymphoma. The clinical and histophological diagnosis of early mycosis fungoides is usually diffucult. There is no special laboratory method for the diagnosis of MF disease and this is the most important problem in diagnosis and also follow up the effectiveness of treatment. Adenosine deaminase (ADA activity is a non-specific marker of T cell activation. In the present study, we aimed to investigate the levels of plasma and tissue ADA in patients with mycosis fungoides and to determine if ADA is an activation criteria for this disease. Materials and Medhods: The levels of ADA activities in both plasma and tissues were spectrophotometrically measured in 40 patients with MF and compared to those of 33 healthy subjects. Moreover, a subgroup analysis regarding ADA activities was performed in 17 patients who achieved complete remission after different kinds of treatments. Results: Patients with MF had more significantly elevated plasma and tissue ADA activity levels than those of control groups (respectively p0.05; MF patients in remission were found to have higher plasma levels of ADA activities than those of controls (p<0.001. Conclusion: These findings of the current study may provide an important clinical support for showing the roles of plasma and tissue ADA activity levels to predict disease activity in MF patients. In addition, levels of ADA activity measurements might be a marker to follow up in MF patients.

  15. ADENOSINE DEAMINASE ACTIVITY AND SERUM C-REACTIVE PROTEIN AS PROGNOSTIC MARKERS OF CHAGAS DISEASE SEVERITY

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    Iván Darío BRAVO-TOBAR

    2015-10-01

    Full Text Available SUMMARY Chagas disease is a public health problem worldwide. The availability of diagnostic tools to predict the development of chronic Chagas cardiomyopathy is crucial to reduce morbidity and mortality. Here we analyze the prognostic value of adenosine deaminase serum activity (ADA and C-reactive protein serum levels (CRP in chagasic individuals. One hundred and ten individuals, 28 healthy and 82 chagasic patients were divided according to disease severity in phase I (n = 35, II (n = 29, and III (n = 18. A complete medical history, 12-lead electrocardiogram, chest X-ray, and M-mode echocardiogram were performed on each individual. Diagnosis of Chagas disease was confirmed by ELISA and MABA using recombinant antigens; ADA was determined spectrophotometrically and CRP by ELISA. The results have shown that CRP and ADA increased linearly in relation to disease phase, CRP being significantly higher in phase III and ADA at all phases. Also, CRP and ADA were positively correlated with echocardiographic parameters of cardiac remodeling and with electrocardiographic abnormalities, and negatively with ejection fraction. CRP and ADA were higher in patients with cardiothoracic index ≥ 50%, while ADA was higher in patients with ventricular repolarization disturbances. Finally, CRP was positively correlated with ADA. In conclusion, ADA and CRP are prognostic markers of cardiac dysfunction and remodeling in Chagas disease.

  16. ADENOSINE DEAMINASE ACTIVITY AND SERUM C-REACTIVE PROTEIN AS PROGNOSTIC MARKERS OF CHAGAS DISEASE SEVERITY

    Science.gov (United States)

    BRAVO-TOBAR, Iván Darío; NELLO-PÉREZ, Carlota; FERNÁNDEZ, Alí; MOGOLLÓN, Nora; PÉREZ, Mary Carmen; VERDE, Juan; CONCEPCIÓN, Juan Luis; RODRIGUEZ-BONFANTE, Claudina; BONFANTE-CABARCAS, Rafael

    2015-01-01

    SUMMARY Chagas disease is a public health problem worldwide. The availability of diagnostic tools to predict the development of chronic Chagas cardiomyopathy is crucial to reduce morbidity and mortality. Here we analyze the prognostic value of adenosine deaminase serum activity (ADA) and C-reactive protein serum levels (CRP) in chagasic individuals. One hundred and ten individuals, 28 healthy and 82 chagasic patients were divided according to disease severity in phase I (n = 35), II (n = 29), and III (n = 18). A complete medical history, 12-lead electrocardiogram, chest X-ray, and M-mode echocardiogram were performed on each individual. Diagnosis of Chagas disease was confirmed by ELISA and MABA using recombinant antigens; ADA was determined spectrophotometrically and CRP by ELISA. The results have shown that CRP and ADA increased linearly in relation to disease phase, CRP being significantly higher in phase III and ADA at all phases. Also, CRP and ADA were positively correlated with echocardiographic parameters of cardiac remodeling and with electrocardiographic abnormalities, and negatively with ejection fraction. CRP and ADA were higher in patients with cardiothoracic index ≥ 50%, while ADA was higher in patients with ventricular repolarization disturbances. Finally, CRP was positively correlated with ADA. In conclusion, ADA and CRP are prognostic markers of cardiac dysfunction and remodeling in Chagas disease. PMID:26603224

  17. Correlation study of adenosine deaminase and its isoenzymes in type 2 diabetes mellitus

    Science.gov (United States)

    Sapkota, Lokendra Bahadur; Thapa, Sangita; Subedi, Nuwadatta

    2017-01-01

    Objective Adenosine deaminase (ADA) plays an important role in cell-mediated immunity and modulation of insulin activity. Its clinical and diagnostic significance in Nepalese type 2 diabetes is not yet characterized. So, this study's objective was to determine the isoenzymatic activities of ADA (ADA1, ADA2, and total ADA) and show its correlation with demographic, anthropometric, and biochemical characteristics of type 2 Nepalese subjects with diabetes. Research design and methods This is a hospital-based cross-sectional study including 80 type 2 diabetes mellitus (DM) patients and same number of age-matched and sex-matched healthy controls. Data were collected using preformed set of questionnaires and biochemical data were obtained from the laboratory analysis of the patient's blood samples. Statistical analysis was performed with SPSS V.20. Results A significantly higher (pdiabetic cases compared with controls. Serum ADA activities were significantly higher in cases compared with controls (pdiabetes. Conclusions Serum ADA activities were significantly higher in type 2 diabetic patients compared with controls having significant positive correlation with glycemic parameters. Serum ADA and its isoenzymes could be used as biomarkers for assessing glycemic status in patients with type 2 DM.

  18. Hematopoietic stem cell gene therapy for adenosine deaminase deficient-SCID.

    Science.gov (United States)

    Aiuti, Alessandro; Brigida, Immacolata; Ferrua, Francesca; Cappelli, Barbara; Chiesa, Robert; Marktel, Sarah; Roncarolo, Maria-Grazia

    2009-01-01

    Gene therapy is a highly attractive strategy for many types of inherited disorders of the immune system. Adenosine deaminase (ADA) deficient-severe combined immunodeficiency (SCID) has been the target of several clinical trials based on the use of hematopoietic stem/progenitor cells engineered with retroviral vectors. The introduction of a low intensity conditioning regimen has been a crucial factor in achieving stable engrafment of hematopoietic stem cells and therapeutic levels of ADA-expressing cells. Recent studies have demonstrated that gene therapy for ADA-SCID has favorable safety profile and is effective in restoring normal purine metabolism and immune functions. Stem cell gene therapy combined with appropriate conditioning regimens might be extended to other genetic disorders of the hematopoietic system.

  19. Non-infectious lung disease in patients with adenosine deaminase deficient severe combined immunodeficiency.

    Science.gov (United States)

    Booth, C; Algar, V E; Xu-Bayford, J; Fairbanks, L; Owens, C; Gaspar, H B

    2012-06-01

    Adenosine deaminase deficiency is a disorder of purine metabolism manifesting severe combined immunodeficiency (ADA-SCID) and systemic abnormalities. Increased levels of the substrate deoxyadenosine triphosphate (dATP) lead to immunodeficiency and are associated in a murine model with pulmonary insufficiency. We compared a cohort of patients with ADA-SCID and X-linked SCID and found that despite similar radiological and respiratory findings, positive microbiology is significantly less frequent in ADA-SCID patients (p < 0.0005), suggesting a metabolic pathogenesis for the lung disease. Clinicians should be aware of this possibility and correct metabolic abnormalities either through enzyme replacement or haematopoietic stem cell transplant, in addition to treating infectious complications.

  20. Serum Adenosine deaminase activity and C-reactive protein levels in unstable angina

    Directory of Open Access Journals (Sweden)

    Rani Surekha

    2003-01-01

    Full Text Available In unstable angina (USA patients, immunological responses contributing to inflammation play a vital role in plaque rupture and thrombosis causing stroke. In the present study an attempt is made to estimate the levels of adenosine deaminase activity, an immunoenzyme marker and C-reactive protein, a marker of inflammation in USA patients. 45 patients presenting USA and 50 age and sex matched healthy controls were included in the study. Serum ADA activity was measured spectrophotometrically at 630nm and serum C-reactive protein was detected using Avitex CRP kit, which is a rapid latex agglutination test. The Mean ADA levels were 41.15 ± 11.04 in patients and 20.71±5.63 in controls and 66.6% of patients and none of the controls were positive to CRP. The present study observed the importance of ADA as a serum marker in addition to CRP for assessing the immune response in USA patients.

  1. Site-directed mutagenesis and bacterial expression of human adenosine deaminase

    Energy Technology Data Exchange (ETDEWEB)

    Danton, M.J.; Leonardo, J.; Riley, L.; Coleman, M.S.

    1987-05-01

    Adenosine deaminase (ADA) is a purine salvage pathway enzyme, the absence of which is associated with severe combined immunodeficiency disease. Time-resolved fluorescence studies, in the presence of enzyme inhibitors, indicate that at least one of the four tryptophans present in the protein molecule is close to (or in) the active site. To investigate the role of these tryptophan residues in enzyme function, they have cloned ADA cDNA into a vector in which expression is directed by the lambda P/sub R/ promoter. E. coli cells deficient in ADA were transformed with the vector construct and were shown to synthesize catalytically active human ADA. Site directed mutagenesis, coupled with a uracil selection technique for generating mutants with high efficiency, was used to construct mutant alleles of the cloned ADA. Eight mutants were obtained with base substitutions converting each of the four tryptophans to arginine or glycine. The correlation between these specific mutations and the functional expression of ADA has been examined in the ADA deficient bacterial host.

  2. Mutations in the human adenosine deaminase gene that affect protein structure and RNA splicing

    Energy Technology Data Exchange (ETDEWEB)

    Akeson, A.L.; Wiginton, D.A.; States, C.J.; Perme, C.M.; Dusing, M.R.; Hutton, J.J.

    1987-08-01

    Adenosine deaminase deficiency is one cause of the genetic disease severe combined immunodeficiency. To identify mutations responsible for ADA deficiency, the authors synthesized cDNAs to ADA mRNAs from two cell lines, GM2756 and GM2825A, derived from ADA-deficient immunodeficient patients. Sequence analysis of GM2756 cDNA clones revealed a different point mutation in each allele that causes amino acid changes of alanine to valine and arginine to histidine. One allele of GM2825A also has a point mutation that causes an alanine to valine substitution. The other allele of GM2825A was found to produce an mRNA in which exon 4 had been spliced out but had no other detrimental mutations. S1 nuclease mapping of GM2825A mRNA showed equal abundance of the full-length ADA mRNA and the ADA mRNA that was missing exon 4. Several of the ADA cDNA clones extended 5' of the major initiation start site, indicating multiple start sites for ADA transcription. The point mutations in GM2756 and GM2825A and the absence of exon 4 in GM2825A appear to be directly responsible for the ADA deficiency. Comparison of a number of normal and mutant ADA cDNA sequences showed a number of changes in the third base of codons. These change do not affect the amino acid sequence. Analyses of ADA cDNAs from different cell lines detected aberrant RNA species that either included intron 7 or excluded exon 7. Their presence is a result of aberrant splicing of pre-mRNAs and is not related to mutations that cause ADA deficiency.

  3. Expression of human adenosine deaminase in murine hematopoietic cells.

    Science.gov (United States)

    Belmont, J W; MacGregor, G R; Wager-Smith, K; Fletcher, F A; Moore, K A; Hawkins, D; Villalon, D; Chang, S M; Caskey, C T

    1988-01-01

    Multiple replication-defective retrovirus vectors were tested for their ability to transfer and express human adenosine deaminase in vitro and in vivo in a mouse bone marrow transplantation model. High-titer virus production was obtained from vectors by using both a retrovirus long terminal repeat promoter and internal transcriptional units with human c-fos and herpes virus thymidine kinase promoters. After infection of primary murine bone marrow with one of these vectors, human adenosine deaminase was detected in 60 to 85% of spleen colony-forming units and in the blood of 14 of 14 syngeneic marrow transplant recipients. This system offers the opportunity to assess methods for increasing efficiency of gene transfer, for regulation of expression of foreign genes in hematopoietic progenitors, and for long-term measurement of the stability of expression in these cells. Images PMID:3072474

  4. Severe combined immunodeficiency due to adenosine deaminase deficiency.

    Science.gov (United States)

    Hussain, Waqar; Batool, Asma; Ahmed, Tahir Aziz; Bashir, Muhammad Mukarram

    2012-03-01

    Severe Combined Immunodeficiency is the term applied to a group of rare genetic disorders characterised by defective or absent T and B cell functions. Patients usually present in first 6 months of life with respiratory/gastrointestinal tract infections and failure to thrive. Among the various types of severe combined immunodeficiency, enzyme deficiencies are relatively less common. We report the case of a 6 years old girl having severe combined immunodeficiency due to adenosine deaminase deficiency.

  5. Influence of hemodialysis on the plasma concentration of adenosine deaminase in patients with chronic kidney disease

    Directory of Open Access Journals (Sweden)

    Eduardo O. Chielle

    2015-06-01

    Full Text Available ABSTRACT Introduction: Over the past years there has been a significant increase in hospitalizations and treatments due to kidney complications that eventually resulted in the increased number of patients on dialysis. The adenosine deaminase (ADA enzyme mediates the formation of some defense cells of the organism and is therefore a marker of inflammation. Objective: The objective of this study was to evaluate biomarkers of renal function and serum ADA of hemodialysis patients. Materials and methods: Blood samples were collected from 80 patients – 40 women and 40 men – between 19 and 60 years old, before and after the completion of hemodialysis. Results: There was a significant difference in levels of creatinine, urea and ADA in pre- and post-hemodialysis periods (p < 0.0001. There was a significant increase in post-dialysis ADA regardless of sex; however there was a significantly greater increase in men. Conclusion: The results showed a reduction in urea and creatinine parameters, evidencing the main purpose of hemodialysis. This study suggests that the determination of ADA activity could be used to monitor inflammation in hemodialysis patients, however wider and more specific studies are needed to show the effectiveness of serum ADA activity as an inflammatory marker in patients with chronic kidney disease.

  6. Modulatory effect of iron chelators on adenosine deaminase activity and gene expression in Trichomonas vaginalis.

    Science.gov (United States)

    Primon-Barros, Muriel; Rigo, Graziela Vargas; Frasson, Amanda Piccoli; Santos, Odelta dos; Smiderle, Lisiane; Almeida, Silvana; Macedo, Alexandre José; Tasca, Tiana

    2015-11-01

    Trichomonas vaginalis is a flagellate protozoan that parasitises the urogenital human tract and causes trichomoniasis. During the infection, the acquisition of nutrients, such as iron and purine and pyrimidine nucleosides, is essential for the survival of the parasite. The enzymes for purinergic signalling, including adenosine deaminase (ADA), which degrades adenosine to inosine, have been characterised in T. vaginalis. In the evaluation of the ADA profile in different T. vaginalis isolates treated with different iron sources or with limited iron availability, a decrease in activity and an increase in ADA gene expression after iron limitation by 2,2-bipyridyl and ferrozine chelators were observed. This supported the hypothesis that iron can modulate the activity of the enzymes involved in purinergic signalling. Under bovine serum limitation conditions, no significant differences were observed. The results obtained in this study allow for the assessment of important aspects of ADA and contribute to a better understanding of the purinergic system in T. vaginalis and the role of iron in establishing infection and parasite survival.

  7. Development of gene therapy: potential in severe combined immunodeficiency due to adenosine deaminase deficiency

    Directory of Open Access Journals (Sweden)

    Claudia A Montiel-Equihua

    2009-12-01

    Full Text Available Claudia A Montiel-Equihua, Adrian J Thrasher, H Bobby GasparCentre for Immunodeficiency, Molecular Immunology Unit, UCL Institute of Child Health, London, UKAbstract: The history of stem cell gene therapy is strongly linked to the development of gene therapy for severe combined immunodeficiencies (SCID and especially adenosine deaminase (ADA-deficient SCID. Here we discuss the developments achieved in over two decades of clinical and laboratory research that led to the establishment of a protocol for the autologous transplant of retroviral vector-mediated gene-modified hematopoietic stem cells, which has proved to be both successful and, to date, safe. Patients in trials in three different countries have shown long-term immunological and metabolic correction. Nevertheless, improvements to the safety profile of viral vectors are underway and will undoubtedly reinforce the position of stem cell gene therapy as a treatment option for ADA-SCID.Keywords: adenosine deaminase, severe combined immunodeficiency, gene therapy, hematopoietic stem cell, retrovirus, clinical trial

  8. Relevance of adenosine deaminase as a marker for tubercu-lous pleural effusion in developing countries

    Institute of Scientific and Technical Information of China (English)

    Rishad A; Patil BS; Das KK

    2009-01-01

    Objective:Relevance of estimation of pleural adenosine deaminase (PADA)and serum adenosine deaminase (SADA)levels in pleural effusion especially in cases of lymphocytic predominant exudative tubercular effu-sions.Methods:Fifty patients (33 male and 17 female;age:44.12 ±11.51 years)with pleural effusions were selected to assay adenosine deaminase (ADA)activity in pleural fluid and serum in adjunct to pleural fluid analysis.Effusions were individually classified as transudates or exudates after careful evaluation of all the biochemical parameters of pleural fluid and serum of patients and on the basis of Light's criteria.Cutoff val-ue for PADA was taken as 60U /L and that for pleural /serum ADA ratio (P/S ADA)was 1.8.Results:Four-ty-three patients had exudative effusions among which 38 patients had tuberculous pleural effusions and 5 had nontubercular effusions.7 cases were transudates.Mean PADA levels in tubercular group (78.95 ±25.32 U /L)were found to be much higher P =0.000 0)than nontubercular (23.00 ±5.22 U /L)group.SADA levels in tubercular group (31.05 ±6.42 U /L)were significantly higher (P =0.000 0)as compared to nontubercu-lar group (15.58 ±8.35 U /L).PADA cutoff at 60 U /L yielded sensitivity and specificity of 81.5% and 100% respectively,whereas P/S ADA ratio at 1.8 gave sensitivity and specificity of 84.2% and 75% respec-tively.A positive correlation (r =0.507,P =0.001 1)between PADA and SADA was found in tubercular group but no such correlation (r =0.302,P =0.340 7)was observed in nontubercular group.Conclusion:The measurement of ADA in tubercular pleural effusions has not only relevance but also a high diagnostic utility when other clinical and laboratory tests are either negative or confusing.

  9. Development of gene therapy: potential in severe combined immunodeficiency due to adenosine deaminase deficiency

    Science.gov (United States)

    Montiel-Equihua, Claudia A; Thrasher, Adrian J; Gaspar, H Bobby

    2010-01-01

    The history of stem cell gene therapy is strongly linked to the development of gene therapy for severe combined immunodeficiencies (SCID) and especially adenosine deaminase (ADA)-deficient SCID. Here we discuss the developments achieved in over two decades of clinical and laboratory research that led to the establishment of a protocol for the autologous transplant of retroviral vector-mediated gene-modified hematopoietic stem cells, which has proved to be both successful and, to date, safe. Patients in trials in three different countries have shown long-term immunological and metabolic correction. Nevertheless, improvements to the safety profile of viral vectors are underway and will undoubtedly reinforce the position of stem cell gene therapy as a treatment option for ADA-SCID. PMID:24198507

  10. Diagnostic value of interferon gamma and adenosine deaminase for tuberculous pleural effusion

    Institute of Scientific and Technical Information of China (English)

    Hou-rongCai; Chen-hongSun; Lin-juenDai; Zai-rongCheng

    2001-01-01

    To explore the significance of interferon gamma(IFN-γ) and adenosine deaminase (ADA)in differential diagnosis of pleural effusions. Methods: Levels of IFN-γ was measured by enzyme-linked immunosorbent assay, ADA activity was measured by colorimetric method. 37 patients with tuberculous pleural effusion and 36 patients with non-tuberculous pleurai effusions including 25 patients with malignant pleural effusions and 8 patients with pleural transudates were studied. Results: The levels of IFN-γ in patients with tuberculous pleural effusions(490.83±384.67 pg.mL-1) were higher than those with malignant pleural effusions(36.40±90.85 pg. mL-1) and pleural transudates(14.87±5.96 pg. mL-1) (P<0.01). Mean ADA activity was 52.69±17.78 U. L-1 in tuberculous pleural effusion; 19.53±13.59 in malignant pleural effusions; 9.43±4.06 inpleural transudates. The difference is significant (P<0.001). The diagnostic sensitivity of IFN-γ for tuberculous pleural effusions is 81%, specifity is 97%, the over accuracy is 90.4%. The diagnostic efficiency of ADA as following: sensitivity 89%, specifity 97%, and the over accuracy 94.5%. Conclusions: Assessments of IFN-γ and ADA in pleural effusions are of clinically diagnostic value in distinguishing tuberculous from non-tuberculous pleural effusions.

  11. Cerebrospinal fluid adenosine deaminase activity: A complimentary tool in the early diagnosis of tuberculous meningitis

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    Taori Girdhar M

    2006-03-01

    Full Text Available Abstract Background Tuberculous meningitis (TBM is the commonest form of neurotuberculosis caused by Mycobacterium tuberculosis bacilli (MTB. The diagnosis of TBM is often difficult. A reliable, cost-effective and rapid diagnostic test, which can be performed in any standard pathology laboratory, could be of help in the diagnosis of TBM. In the present study we measured the adenosine deaminase (ADA activity in cerebrospinal fluid (CSF of TBM and non-TBM patients. Method ADA activity in CSF was determined according to a method based on the Berthlot reaction, which is the formation of a colored indophenol complex from ammonia liberated from adenosine, and quantified spectrophotometrically. Results The CSF ADA activity from TBM patients was compared with CSF ADA from non-TBM infectious meningitis patients, and from patients with non-infectious neurological disorders. The mean CSF ADA activity was found to be significantly higher in CSF of TBM patients, 14.31 ± 3.87 (2.99–26.94, mean ± SD with range, than in the CSF from non-TBM infectious meningitis, 9.25 ± 2.14 (4.99–13.96 and from the non-infectious neurological disorders group, 2.71 ± 1.96 (0.00–7.68, P Conclusion This study demonstrated that ADA activity in the CSF of TBM patients, using a cut-off value 11.39 U/L/min, can be useful for the early differential diagnosis of TBM. This test can be performed in any pathology laboratory where more sophisticated methods are not available.

  12. Adenosine deaminase activity in serum, erythrocytes and lymphocytes of rats infected with Leptospira icterohaemorrhagiae.

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    Tonin, Alexandre A; Pimentel, Victor C; da Silva, Aleksandro S; de Azevedo, Maria Isabel; Souza, Viviane C G; Wolkmer, Patrícia; Rezer, João F P; Badke, Manoel R T; Leal, Daniela B R; Schetinger, Maria Rosa C; Monteiro, Silvia G; Lopes, Sonia T A

    2012-04-01

    Leptospirosis is a systemic disease of humans and domestic animals, mainly dogs, cattle and swine. The course of human leptospirosis varies from mild to severe fatal forms and the most severe form of human leptospirosis is principally caused by Leptospira interrogans serovar icterohaemorrhagiae (L. icterohaemorrhagiae). The enzyme adenosine deaminase (ADA) plays an important role in the production and differentiation of blood cells. The aim of this study was to evaluate the activity of ADA in serum, erythrocytes and lymphocytes of rats infected with L. icterohaemorrhagiae, as compared with non-infected rats. Twenty-four adult rats, divided into two uniform groups (A and B) were used for the enzymatic assays. The animals in Group B were inoculated intraperitoneally with 2×10(8) leptospires/rat, and the rodents in Group A (control) were not-inoculated. Blood collection was performed on days 5 and 15 post-infection (PI) and the blood used to assess the ADA activity. The infection by L.icterohaemorrhagiae altered erythrocyte count, hemoglobin concentration and hematocrit, causing a decrease in all these parameters on day 15 PI. Lymphocytes decreased significantly on day 15 PI, and ADA activity in serum was inhibited in infected rats on days 5 and 15 PI and its activity in erythrocytes were increased on day 5 PI. On day 5 PI, we found an increase in ADA activity in erythrocytes of infected rats. No correlation was observed between hematocrit and erythrocyte ADA activity on days 5 and 15 PI. The ADA activity was inhibited in rats infected on day 15 PI. A positive correlation (r(2)=60) was also observed between the number of lymphocytes and ADA activity in lymphocytes on day 15 PI (Perythrocytes in experimental infection by L.icterohaemorrhagiae in rats, concomitantly with hematological parameters.

  13. Characterization of a gene coding for a putative adenosine deaminase-related growth factor by RNA interference in the basidiomycete Flammulina velutipes.

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    Sekiya, Shuichi; Yamada, Masato; Shibata, Kou; Okuhara, Toru; Yoshida, Masumi; Inatomi, Satoshi; Taguchi, Goro; Shimosaka, Makoto

    2013-04-01

    A full-length cDNA coding for a putative adenosine deaminase (Fv-ada) was isolated from the basidiomycete Flammulina velutipes. Fv-ada encodes a polypeptide consisting of 537 amino acid residues, which has a consensus sequence conserved among adenosine deaminase-related growth factors (ADGF) found in several metazoa, including chordates and insects. Fv-ada transcript was detected at all stages of growth in dikaryotic F. velutipes cells, with a peak at the primordial stage. Heterologous expression of Fv-ada in the yeast Pichia pastoris produced recombinant Fv-ADA that catalyzed the conversion of adenosine to inosine. Dikaryotic mycelia from F. velutipes were transformed with the binary plasmid pFungiway-Fv-ada, which was designed to suppress the expression of Fv-ada through RNA interference. The growth rates of the resulting transformants were retarded in response to the degree of suppression, indicating that Fv-ada plays an important role in the mycelial growth of F. velutipes. These results suggested that ADGF could function as growth factors in fungi, as is seen in other eukaryotes.

  14. Adenosine deaminase in CSF and pleural fluid for diagnosis of tubercular meningitis and pulmonary tuberculosis.

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    Nepal, A K; Gyawali, N; Poudel, B; Mahato, R V; Lamsal, M; Gurung, R; Baral, N; Majhi, S

    2012-12-01

    Tuberculosis (TB) is one of the most common infectious diseases in developing countries including Nepal. Delay in diagnosis and treatment of tuberculosis results in poor prognosis of the disease. This study was conducted to estimate diagnostic cut off values of Adenosine Deaminase (ADA) in cerebrospinal fluid (CSF) and pleural fluid and to evaluate the sensitivity, specificity, positive and negative predictive values ofADA in pleural fluid and CSF from patients with tuberculous and non-tuberculous disease. A total of 98 body fluid (CSF: 24, Pleural fluid: 74) specimens were received for the estimation of ADA. ADA activity was measured at 37 degrees C by spectrophotometric method of Guisti and Galanti, 1984 at 625nm wavelength. Among the patients enrolled for the study subjects for which CSF were received (n = 24) included 8 tuberculous meningitis (TBM), and 16 non-tubercular meningitis (NTM). Pleural fluid samples (n = 74) were received from 19 pulmonary TB with pleural effusion, 17 PTB without pleural effusion and 37 of non-tuberculous disease patients. CSF ADA activity were (11. 1 +/- 2.03 IU/L) and (5.3 +/- +1.89 IU/L) (p <00001) in TM and non-NTM groups and Pleural fluid ADA activity were (10 +/- 22.18 IU/L) and (23.79 +/- 11.62 IU/L) (p < 0.001) in PTB and non-TB groups respectively. ADA test in body fluids, which is simple, cost-effective and sensitive, specific for the tubercular disease is recommended to perform before forwarding the cumbersome and expensive procedures like culture and PCR for TB diagnosis.

  15. Diagnostic value of pleural fluid adenosine deaminase activity in tuberculosis pleurisy

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    Abbas ali Niazi

    2009-09-01

    Full Text Available Background: Diagnosis of tuberculosis pleurisies is difficult because of its nonspecific clinical presentation and insufficient traditional diagnostic methods. We investigated the use of adenosine deaminase (ADA activity in tuberculosis pleurisies. Methods: A number of 85 patients were analyzed with exudative pleural effusions. Using the ROC curve, we determined the optimal cutoff for TB pleurisy. Results: A number of 58 exudative samples were nontuberculous (non-TB and 27 were tuberculosis (TB. There was statistically significant difference (p<0.0001 between the means of pleural fluid ADA levels among the TB and non-TB populations. The prevalence of TB pleurisy in the studied population was 31%. Using the cutoff point equal to 35 for diagnosing TB effusions the sensitivity and specificity 70.3% and 91.3%, respectively. The positive predictive value (PPV was 79.1% and the negative predictive value (NPV was 86.8%. A pleural fluid ADA value <19 IU/L suggests that a tuberculosis effusion is highly unlikely. Conclusion: Pleural fluid total ADA assay is a sensitive and specific test suitable for rapid diagnosis of TB pleurisy.

  16. Outcome of hematopoietic stem cell transplantation for adenosine deaminase-deficient severe combined immunodeficiency.

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    Hassan, Amel; Booth, Claire; Brightwell, Alex; Allwood, Zoe; Veys, Paul; Rao, Kanchan; Hönig, Manfred; Friedrich, Wilhelm; Gennery, Andrew; Slatter, Mary; Bredius, Robbert; Finocchi, Andrea; Cancrini, Caterina; Aiuti, Alessandro; Porta, Fulvio; Lanfranchi, Arnalda; Ridella, Michela; Steward, Colin; Filipovich, Alexandra; Marsh, Rebecca; Bordon, Victoria; Al-Muhsen, Saleh; Al-Mousa, Hamoud; Alsum, Zobaida; Al-Dhekri, Hasan; Al Ghonaium, Abdulaziz; Speckmann, Carsten; Fischer, Alain; Mahlaoui, Nizar; Nichols, Kim E; Grunebaum, Eyal; Al Zahrani, Daifulah; Roifman, Chaim M; Boelens, Jaap; Davies, E Graham; Cavazzana-Calvo, Marina; Notarangelo, Luigi; Gaspar, H Bobby

    2012-10-25

    Deficiency of the purine salvage enzyme adenosine deaminase leads to SCID (ADA-SCID). Hematopoietic cell transplantation (HCT) can lead to a permanent cure of SCID; however, little data are available on outcome of HCT for ADA-SCID in particular. In this multicenter retrospective study, we analyzed outcome of HCT in 106 patients with ADA-SCID who received a total of 119 transplants. HCT from matched sibling and family donors (MSDs, MFDs) had significantly better overall survival (86% and 81%) in comparison with HCT from matched unrelated (66%; P < .05) and haploidentical donors (43%; P < .001). Superior overall survival was also seen in patients who received unconditioned transplants in comparison with myeloablative procedures (81% vs 54%; P < .003), although in unconditioned haploidentical donor HCT, nonengraftment was a major problem. Long-term immune recovery showed that regardless of transplant type, overall T-cell numbers were similar, although a faster rate of T-cell recovery was observed after MSD/MFD HCT. Humoral immunity and donor B-cell engraftment was achieved in nearly all evaluable surviving patients and was seen even after unconditioned HCT. These data detail for the first time the outcomes of HCT for ADA-SCID and show that, if patients survive HCT, long-term cellular and humoral immune recovery is achieved.

  17. Alterations in the brain adenosine metabolism cause behavioral and neurological impairment in ADA-deficient mice and patients

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    Sauer, Aisha V.; Hernandez, Raisa Jofra; Fumagalli, Francesca; Bianchi, Veronica; Poliani, Pietro L.; Dallatomasina, Chiara; Riboni, Elisa; Politi, Letterio S.; Tabucchi, Antonella; Carlucci, Filippo; Casiraghi, Miriam; Carriglio, Nicola; Cominelli, Manuela; Forcellini, Carlo Alberto; Barzaghi, Federica; Ferrua, Francesca; Minicucci, Fabio; Medaglini, Stefania; Leocani, Letizia; la Marca, Giancarlo; Notarangelo, Lucia D.; Azzari, Chiara; Comi, Giancarlo; Baldoli, Cristina; Canale, Sabrina; Sessa, Maria; D’Adamo, Patrizia; Aiuti, Alessandro

    2017-01-01

    Adenosine Deaminase (ADA) deficiency is an autosomal recessive variant of severe combined immunodeficiency (SCID) caused by systemic accumulation of ADA substrates. Neurological and behavioral abnormalities observed in ADA-SCID patients surviving after stem cell transplantation or gene therapy represent an unresolved enigma in the field. We found significant neurological and cognitive alterations in untreated ADA-SCID patients as well as in two groups of patients after short- and long-term enzyme replacement therapy with PEG-ADA. These included motor dysfunction, EEG alterations, sensorineural hypoacusia, white matter and ventricular alterations in MRI as well as a low mental development index or IQ. Ada-deficient mice were significantly less active and showed anxiety-like behavior. Molecular and metabolic analyses showed that this phenotype coincides with metabolic alterations and aberrant adenosine receptor signaling. PEG-ADA treatment corrected metabolic adenosine-based alterations, but not cellular and signaling defects, indicating an intrinsic nature of the neurological and behavioral phenotype in ADA deficiency. PMID:28074903

  18. Evaluation of adenosine deaminase seric activity in the diagnosis of bovine tuberculosis

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    Márcio Roberto Silva

    2006-06-01

    Full Text Available Determination of seric levels of adenosine deaminase (ADA, an enzyme produced by monocytes/macrophages and lymphocytes, has been used in the diagnosis of human tuberculosis (TB. In the present study, ADA seric activity was evaluated comparatively to the comparative tuberculin test in the diagnosis of bovine tuberculosis. Two hundred fifty-six cattle were classified by origin and by the comparative tuberculin test as TB-positive animals (n = 52, from herds where the Mycobacterium bovis had previously been isolated, and TB-negative animals (n = 204, TB-free herds. The mean ADA seric value from the TB-positive group (4.45 ± 2.33 U/L was significantly lower (p = 0.008 than that observed in sera from the TB-negative group (6.12 ± 4.47 U/L. When animals from a herd with clinical cases of enzootic bovine leukosis of TB-negative group were withdrawn from analysis, the mean ADA seric values of TB-negative group (5.12 ± 3.75 U/L was not significantly different anymore from that of the TB-positive group (p = 0.28. There was no agreement in the diagnosis of bovine TB between comparative tuberculin test and determination of ADA seric values, using two different cutoff points, being 6.12 U/L and 15.0 U/L, (kappa = -0.086 and kappa = -0.082, respectively. In conclusion, the determination of ADA seric activity was not a good auxiliary test for bovine TB, because it was not able to distinguish between TB-positive and TB-negative animals.

  19. Effects of aqueous extract from Silybum marianum on adenosine deaminase activity in cancerous and noncancerous human gastric and colon tissues

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    Bahadır Öztürk

    2015-01-01

    Full Text Available Objective: Investigation of possible effects of Silybum marianum extract (SME on adenosine deaminase (ADA activity in cancerous and noncancerous human gastric and colon tissues to obtain information about possible mechanism of anticancer action of S. marianum. Materials and Methods: Cancerous and noncancerous human gastric and colon tissues removed from patients by surgical operations were used in the studies. The extract was prepared in distilled water. Before and after treatment with the extract, ADA activities in the samples were measured. Results: ADA activity was found to be lowered significantly in cancerous gastric tissues but not in noncancerous gastric tissues after treatment with the SME. In the colon tissues, ADA activities were however found to increase after the treatment of SME. Conclusion: Our results suggest that the aqueous extract from S. marianum inhibits ADA activity in cancerous gastric tissues significantly. It is suggested that in addition to other proposed mechanisms, accumulated adenosine due to the inhibition of ADA might also play a part in the anticancer properties of the S. marianum.

  20. Adenosine deaminase polymorphism affects sleep EEG spectral power in a large epidemiological sample.

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    Diego Robles Mazzotti

    Full Text Available Slow wave oscillations in the electroencephalogram (EEG during sleep may reflect both sleep need and intensity, which are implied in homeostatic regulation. Adenosine is strongly implicated in sleep homeostasis, and a single nucleotide polymorphism in the adenosine deaminase gene (ADA G22A has been associated with deeper and more efficient sleep. The present study verified the association between the ADA G22A polymorphism and changes in sleep EEG spectral power (from C3-A2, C4-A1, O1-A2, and O2-A1 derivations in the Epidemiologic Sleep Study (EPISONO sample from São Paulo, Brazil. Eight-hundred individuals were subjected to full-night polysomnography and ADA G22A genotyping. Spectral analysis of the EEG was carried out in all individuals using fast Fourier transformation of the signals from each EEG electrode. The genotype groups were compared in the whole sample and in a subsample of 120 individuals matched according to ADA genotype for age, gender, body mass index, caffeine intake status, presence of sleep disturbance, and sleep-disturbing medication. When compared with homozygous GG genotype carriers, A allele carriers showed higher delta spectral power in Stage 1 and Stages 3+4 of sleep, and increased theta spectral power in Stages 1, 2 and REM sleep. These changes were seen both in the whole sample and in the matched subset. The higher EEG spectral power indicates that the sleep of individuals carrying the A allele may be more intense. Therefore, this polymorphism may be an important source of variation in sleep homeostasis in humans, through modulation of specific components of the sleep EEG.

  1. Adenine arabinoside inhibition of adenovirus replication enhanced by an adenosine deaminase inhibitor.

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    Wigand, R

    1979-01-01

    The inhibition of adenovirus multiplication by adenine arabinoside was determined by yield reduction in one-step multiplication cycle. Inhibition was greatly enhanced by an adenosine deaminase inhibitor (2-deoxycoformycin) in concentrations down to 10 ng/ml. Adenovirus types from four subgroups showed similar results. However, the enhancing effect of adenosine deaminase inhibitor was great in HeLa cells, moderate in human fibroblasts, and negligible in Vero cells. This difference could be explained by different concentrations of adenosine deaminase found in cell homogenates.

  2. Cryptococcal pleuritis containing a high level of adenosine deaminase in a patient with AIDS: a case report.

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    Yoshino, Yusuke; Kitazawa, Takatoshi; Tatsuno, Keita; Ota, Yasuo; Koike, Kazuhiko

    2010-01-01

    Cryptococcal infection is the 4th most common opportunistic infection in patients with acquired immune deficiency syndrome (AIDS). Although pleural effusion alone is an unusual presentation, we present a case of cryptococcal pleuritis in an AIDS patient which was initially difficult to discriminate from tuberculous pleuritis because of the high level of pleural adenosine deaminase (ADA). Cryptococcus neoformans was detected in the culture of the pleural effusion after the initiation of antituberculous treatment. High levels of ADA in the pleural fluid can be observed in patients with cryptococcal pleuritis, and longer incubation of pleural fluid should be performed in all patients who present with pleuritis associated with a high ADA level as the only significant finding.

  3. DNA-templated silver nanoclusters based label-free fluorescent molecular beacon for the detection of adenosine deaminase.

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    Zhang, Kai; Wang, Ke; Xie, Minhao; Zhu, Xue; Xu, Lan; Yang, Runlin; Huang, Biao; Zhu, Xiaoli

    2014-02-15

    A general and reliable fluorescent molecular beacon is proposed in this work utilizing DNA-templated silver nanoclusters (AgNCs). The fluorescent molecular beacon has been employed for sensitive determination of the concentration of adenosine deaminase (ADA) and its inhibition. A well-designed oligonucleotide containing three functional regions (an aptamer region for adenosine assembly, a sequence complementary to the region of the adenosine aptamer, and an inserted six bases cytosine-loop) is adopted as the core element in the strategy. The enzymatic reaction of adenosine catalyzed by ADA plays a key role as well in the regulation of the synthesis of the DNA-templated AgNCs, i.e. the signal indicator. The intensity of the fluorescence signal may thereby determine the concentration of the enzyme and its inhibitor. The detection limit of the ADA can be lowered to 0.05 UL(-1). Also, 100 fM of a known inhibitor erythro-9-(2-hydroxy-3-nonyl) adenine hydrochloride (EHNA) is enough to present distinguishable fluorescence emission. Moreover, since the fluorescent signal indicator is not required to be bound with the oligonucleotide, this fluorescent molecular beacon may integrate the advantages of both the label-free and signal-on strategies.

  4. Piracetam prevents scopolamine-induced memory impairment and decrease of NTPDase, 5'-nucleotidase and adenosine deaminase activities.

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    Marisco, Patricia C; Carvalho, Fabiano B; Rosa, Michelle M; Girardi, Bruna A; Gutierres, Jessié M; Jaques, Jeandre A S; Salla, Ana P S; Pimentel, Víctor C; Schetinger, Maria Rosa C; Leal, Daniela B R; Mello, Carlos F; Rubin, Maribel A

    2013-08-01

    Piracetam improves cognitive function in animals and in human beings, but its mechanism of action is still not completely known. In the present study, we investigated whether enzymes involved in extracellular adenine nucleotide metabolism, adenosine triphosphate diphosphohydrolase (NTPDase), 5'-nucleotidase and adenosine deaminase (ADA) are affected by piracetam in the hippocampus and cerebral cortex of animals subjected to scopolamine-induced memory impairment. Piracetam (0.02 μmol/5 μL, intracerebroventricular, 60 min pre-training) prevented memory impairment induced by scopolamine (1 mg/kg, intraperitoneal, immediately post-training) in the inhibitory avoidance learning and in the object recognition task. Scopolamine reduced the activity of NTPDase in hippocampus (53 % for ATP and 53 % for ADP hydrolysis) and cerebral cortex (28 % for ATP hydrolysis). Scopolamine also decreased the activity of 5'-nucleotidase (43 %) and ADA (91 %) in hippocampus. The same effect was observed in the cerebral cortex for 5'-nucleotidase (38 %) and ADA (68 %) activities. Piracetam fully prevented scopolamine-induced memory impairment and decrease of NTPDase, 5'-nucleotidase and adenosine deaminase activities in synaptosomes from cerebral cortex and hippocampus. In vitro experiments show that piracetam and scopolamine did not alter enzymatic activity in cerebral cortex synaptosomes. Moreover, piracetam prevented scopolamine-induced increase of TBARS levels in hippocampus and cerebral cortex. These results suggest that piracetam-induced improvement of memory is associated with protection against oxidative stress and maintenance of NTPDase, 5'-nucleotidase and ADA activities, and suggest the purinergic system as a putative target of piracetam.

  5. Serum adenosine deaminase as oxidative stress marker in type 2 diabetes mellitus

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    Shashikala Magadi Dasegowda

    2015-05-01

    Results: The study observed an increased level of serum adenosine deaminase, malondialdehyde and decreased levels of total antioxidant capacity in type 2 diabetes mellitus compared to controls. Serum adenosine deaminase levels in type 2 diabetics were 50.77 +/- 6.95 and in controls was 17.86 +/- 4.04. Serum Malondialdehyde levels in type 2 diabetics was 512.13 +/- 70.15 and in controls was 239.32 +/- 23.97. Serum total antioxidant levels in type 2 diabetics was 0.39+/-0.15 and in controls was 1.66+/-0.25. Positive correlation was seen between serum adenosine deaminase and malondialdehyde and it was statistically significant. Statistically significant negative correlation was seen between serum adenosine deaminase and total antioxidant capacity. Conclusion: Adenosine deaminase can be used as oxidative stress marker. Their increased levels indicate oxidative stress in type 2 diabetes mellitus. Therefore, estimation of serum adenosine deaminase levels help in early prediction and prevention of long term complications occurring due to oxidative stress in diabetics, thereby decreasing the mortality and morbidity in them. [Int J Res Med Sci 2015; 3(5.000: 1195-1198

  6. A CORRELATIVE STUDY OF ADENOSINE DEAMINASE ACTIVITY & T.B. IgG IN SERUM IN CASES OF TUBERCULOSIS

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    Ajay

    2012-11-01

    Full Text Available ABSTRACT: INTRODUCTION: Tuberculosis is major cause of morbidity and mort ality in India as well in other parts of world. It is caused by myc obacterium tuberculosis which primarily affects lung and cause pulmonary tuberculosis. Diag nosis of tuberculosis rests upon a positive history of contact, clinical symptoms, x-ray chest, sputum positivity and AFB culture. Adenosine deaminase (ADA is an enzyme which catalyzes the de amination of adenosine into inosine and ammonia. ADA level is found to be elevated in tuber culosis and typhoid fever where cell mediated immunity is elevated. The ADA level is sig nificantly elevated in tuberculosis and helps to differentiate between tubercular and non tubercu lar diseases. The ADA level is also found to be elevated in serum and pleural fluid in patients of tubercular pleural effusion, tubercular ascitis and tubercular pericardial effusion. METHODS : Routine hemogram, Montoux test, X-ray chest, FNAC of lymph nodes, biopsy of lymph node whene ver required, estimation of serum ADA level and T.B.IgG studies were performed in each cas e. RESULTS: In the present study a total of 45 cases were selected for the study. There are 30 cases of pulmonary tuberculosis and 15 controls. The values of serum ADA and tubercular Ig G in pulmonary tubercular group are significantly higher as compared to those of control s. None of the control for ADA showed significant ratio of positivity (≥1.7. One of the 1 5 cases showed remarkable ratio of positivity (>1.2-1.6 and 14 (93.3% cases showed insignifican t ratio of positivity. Only 2 (13.33% of the 15 cases showed positivity for TB IgG and rest 13 (8 6.66% were regarded negative. CONCLUSIONS: Thus it can be concluded that determination of ser um adenosine deaminase levels can effectively diagnose tuberculosis with s ensitivity of 96.66% and specificity of 93.33% as compared to TBIgG showing sensitivity of 90% and specificity of 86.6%. Also cost of ADA estimation is remarkably

  7. Rutin restores adenosine deaminase activity in serum and the liver and improves biochemical parameters in streptozotocin-induced diabetic rats

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    E.O. CHIELLE

    2016-01-01

    Full Text Available ABSTRACT denosine deaminase (ADA is a critical control point in the regulation of adenosine levels. This study aimed to investigate the effects of a polyphenolic flavonoid, rutin, on the activity of ADA in serum, the cerebral cortex, liver, kidney, and biochemical parameters in diabetic rats. The animals were divided into four groups (n=6 for the following treatments: control; diabetic (streptozotocin 55 mg/kg; diabetic with rutin (100 mg/kg/day; diabetic with glibenclamide (10 mg/kg/day. After 30 days, ADA activity and biochemical parameters were analyzed. The ADA activity in the serum was significantly elevated in the diabetic group compared to the control group (p<0.01. The treatment with rutin prevented the increase in ADA activity in the STZ-induced rats when compared to control group. Our data showed that rutin reduced glucose, LDL levels, and hepatic enzymes in comparison with the control group. These results demonstrate that the increase of ADA activity observed in diabetic rats may be an important indicator of the immunopathogenesis of hyperglycemic disorders and suggest that rutin is important for regulating the enzymatic activities associated with immune, hyperglycemic, and inflammatory response in diabetes mellitus.

  8. The usefulness of adenosine deaminase in the diagnosis of tuberculous pericarditis O uso da adenosina deaminase no diagnóstico da tuberculose pericárdica

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    Felipe Francisco Tuon

    2007-06-01

    Full Text Available The objective of this study was to evaluate the adenosine deaminase (ADA activity usefulness in the diagnosis of tuberculous pericarditis (TP, comparing its value with pericardial effusions (PE caused by other pericardial diseases. A retrospective case-control study was conducted with nine cases of TP and 39 other than TP diseases (12 neoplastic, 11 septic and 16 unknown origin. Every patient included in this study had PE samples submitted to ADA activity measures and microbiological analysis, and then had pericardial tissue samples submitted to microbiological and histopathological examination. Considering the value of 40 U/L as the cut-off for the diagnosis of TP, the specificity and sensitivity were respectively of 72% and 89%. The specificity of ADA activity for the TP was best applied in the differential diagnosis from PE of unknown origin. The present study demonstrates the clinical value of the measurement of ADA activity in PE in the diagnosis of TP.O objetivo deste estudo foi avaliar a atividade da adenosina deaminase (ADA como auxiliar no diagnóstico da tuberculose pericárdica (TP, comparando o seu valor no derrame pericárdico com outras doenças pericárdicas. Um estudo retrospectivo tipo caso-controle foi conduzido com nove casos de TP e 39 pacientes com outras doenças pericárdicas (12 neoplasias, 11 pericardites bacterianas e 16 pericardites de etiologia indeterminada. Cada paciente incluído no estudo teve sua amostra de tecido pericárdico encaminhada para estudo microbiológico e histopatológico. Considerando o valor de 40 U/L como corte para o diagnóstico de TP, a especificidade e sensibilidade foram respectivamente 72 e 89%. A especificidade da atividade de ADA para a TP foi melhor aplicada no diagnóstico diferencial entre derrame pericárdico de origem indeterminada. O presente estudo demonstrou o valor clínico da mensuração da atividade de ADA no diagnóstico de TP.

  9. Effects of PUVA and Narrowband UVB on Tissue and Serum Adenosine Deaminase Levels of Patients with Psoriasis

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    Sinem Öztürk

    2013-12-01

    Full Text Available Objective: Adenosine deaminase (ADA, which is accepted as a non-specific marker of T cell activation in psoriasis, has been shown to have an important role in determining activity of disease and efficacy of treatments. This is the first study investigating the levels of ADA in lesional skins of patients with psoriasis. Methods: Thirty-four patients; 26 with chronic plaque type and eight with guttate psoriasis were enrolled in this study. Patients were treated with PUVA or narrowband UVB. Contol group consisted of 25 patients who had an amputation of any extremity because of trauma. In this study, ADA activities were measured in plasma and tissue samples of patients and control group. Psoriasis Area and Severity Index (PASI scores of patients were determined. Results: Plasma and tissue ADA levels of patients with psoriasis were higher than control group (p0.05. Conclusion: These results support the immunological mechanisms showing activation of T cell acts in the pathogenesis of psoriasis and also this study suggests that the levels of plasma and tissue ADA are reliable laboratory parameters in follow-up of the disease.

  10. STUDY OF ADENOSINE DEAMINASE AND LYMPHOCYTE/NEUTROPHIL RATIO IN COMBINATION AS DIAGNOSTIC TOOL FOR TUBERCULAR PLEURAL EFFUSION

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    Md. Faizur

    2015-10-01

    Full Text Available Adenosine deaminase, considered one of the key enzyme of purine metabolism, has been used in work up of lymphocytic pleural effusion. Low level of ADA 50IU/L specially when combined with Lymphocytic/neutrophil ratio >0.75 in pleural fluid is useful test in the diagnosis of tubercular pleurisy. AIM AND OBJECTIVE: To suggest a better diagnostic tool in the diagnosis of pleural effusion of tubercular origin by estimating the activity of ADA along with L/N ratio in pleural effusion. METHOD: Biochemical, cytological and microbiology studies were done by obtaining pleural fluid by thoracocentesis in 100 patients after excluding pleural effusion cases of malignancy, transudative effusion. RESULT: 84 cases were tubercular and had high level of ADA in comparison to rest of 16 non-tubercular cases. At level of 50 IU/L of ADA activity test had sensitivity of 97.6%, specificity 87.5%, positive predictive value 97.6%, negative predictive value 87.5%which increased to 100% and 92.8%, 98.6%, and 100% respectively in combination with test of Lymphocytic/Neutrophilic ratio >0.75. CONCLUSION: ADA level with L/N ratio can be important investigation in diagnosis of tubercular pleural effusion cases.

  11. Mixed inhibition of adenosine deaminase activity by 1,3-dinitrobenzene: a model for understanding cell-selective neurotoxicity in chemically-induced energy deprivation syndromes in brain.

    Science.gov (United States)

    Wang, Yipei; Liu, Xin; Schneider, Brandon; Zverina, Elaina A; Russ, Kristen; Wijeyesakere, Sanjeeva J; Fierke, Carol A; Richardson, Rudy J; Philbert, Martin A

    2012-02-01

    Astrocytes are acutely sensitive to 1,3-dinitrobenzene (1,3-DNB) while adjacent neurons are relatively unaffected, consistent with other chemically-induced energy deprivation syndromes. Previous studies have investigated the role of astrocytes in protecting neurons from hypoxia and chemical injury via adenosine release. Adenosine is considered neuroprotective, but it is rapidly removed by extracellular deaminases such as adenosine deaminase (ADA). The present study tested the hypothesis that ADA is inhibited by 1,3-DNB as a substrate mimic, thereby preventing adenosine catabolism. ADA was inhibited by 1,3-DNB with an IC(50) of 284 μM, Hill slope, n = 4.8 ± 0.4. Native gel electrophoresis showed that 1,3-DNB did not denature ADA. Furthermore, adding Triton X-100 (0.01-0.05%, wt/vol), Nonidet P-40 (0.0015-0.0036%, wt/vol), or bovine serum albumin (0.05 mg/ml or changing [ADA] (0.2 and 2 nM) did not substantially alter the 1,3-DNB IC(50) value. Likewise, dynamic light scattering showed no particle formation over a (1,3-DNB) range of 149-1043 μM. Kinetics revealed mixed inhibition with 1,3-DNB binding to ADA (K(I) = 520 ± 100 μM, n = 1 ± 0.6) and the ADA-adenosine complex (K(IS) = 262 ± 7 μM, n = 6 ± 0.6, indicating positive cooperativity). In accord with the kinetics, docking predicted binding of 1,3-DNB to the active site and three peripheral sites. In addition, exposure of DI TNC-1 astrocytes to 10-500 μM 1,3-DNB produced concentration-dependent increases in extracellular adenosine at 24 h. Overall, the results demonstrate that 1,3-DNB is a mixed inhibitor of ADA and may thus lead to increases in extracellular adenosine. The finding may provide insights to guide future work on chemically-induced energy deprivation.

  12. Repetitive systemic morphine alters activity-dependent plasticity of Schaffer-collateral-CA1 pyramidal cell synapses: involvement of adenosine A1 receptors and adenosine deaminase.

    Science.gov (United States)

    Sadegh, Mehdi; Fathollahi, Yaghoub

    2014-10-01

    The effectiveness of O-pulse stimulation (TPS) for the reversal of O-pattern primed bursts (PB)-induced long-term potentiation (LTP) were examined at the Schaffer-collateral-CA1 pyramidal cell synapses of hippocampal slices derived from rats chronically treated with morphine (M-T). The results showed that slices derived from both control and M-T rats had normal field excitatory postsynaptic potential (fEPSP)-LTP, whereas PS-LTP in slices from M-T rats was significantly greater than that from control slices. When morphine was applied in vitro to slices derived from rats chronically treated with morphine, the augmentation of PS-LTP was not seen. TPS given 30 min after LTP induction failed to reverse the fEPSP- or PS-LTP in both groups of slices. However, TPS delivered in the presence of long-term in vitro morphine caused the PS-LTP reversal. This effect was blocked by the adenosine A1 receptor (A1R) antagonist CPX (200 nM) and furthermore was enhanced by the adenosine deaminase (ADA) inhibitor EHNA (10 μM). Interestingly, TPS given 30 min after LTP induction in the presence of EHNA (10 μM) can reverse LTP in morphine-exposed control slices in vitro. These results suggest adaptive changes in the hippocampus area CA1 in particular in adenosine system following repetitive systemic morphine. Chronic in vivo morphine increases A1R and reduces ADA activity in the hippocampus. Consequently, adenosine can accumulate because of a stimulus train-induced activity pattern in CA1 area and takes the opportunity to work as an inhibitory neuromodulator and also to enable CA1 to cope with chronic morphine. In addition, adaptive mechanisms are differentially working in the dendrite layer rather than the somatic layer of hippocampal CA1.

  13. The Effect of Acute Exercise upon Adenosin Deaminase Oxidant and Antioxidant Activity

    Science.gov (United States)

    Kafkas, M. Emin; Karabulut, Aysun Bay; Sahin, Armagan; Otlu, Onder; Savas, Seyfi; Aytac, Aylin

    2012-01-01

    The purpose of this study was to determine the changes of MDA, glutation (GSH), Adenozine deaminase (ADA) and superoxidase dismutaze (SOD) levels with exercise training in obese middle-aged women (body mass index, MMI [greater than or equal to] 30.0). Twelve obese middle-aged women participated in this study. The descriptive statistics of some of…

  14. Mycobacterium tuberculosis ESAT6 and CPF10 Induce Adenosine Deaminase 2 mRNA Expression in Monocyte-Derived Macrophages

    Science.gov (United States)

    Bae, Mi Jung; Ryu, Suyeon; Kim, Ha-Jeong; Cha, Seung Ick

    2017-01-01

    Background Delayed hypersensitivity plays a large role in the pathogenesis of tuberculous pleural effusion (TPE). Macrophages infected with live Mycobacterium tuberculosis (MTB) increase the levels of adenosine deaminase2 (ADA2) in the pleural fluid of TPE patients. However, it is as yet unclear whether ADA2 can be produced by macrophages when challenged with MTB antigens alone. This study therefore evaluated the levels of ADA2 mRNA expression, using monocyte-derived macrophages (MDMs) stimulated with MTB antigens. Methods Purified monocytes from the peripheral blood mononuclear cells of healthy volunteers were differentiated into macrophages using granulocyte-macrophage colony-stimulating factor (GM-CSF) or macrophage colony-stimulating factor (M-CSF). The MDMs were stimulated with early secretory antigenic target protein 6 (ESAT6) and culture filtrate protein 10 (CFP10). The mRNA expression levels for the cat eye syndrome chromosome region, candidate 1 (CECR1) gene encoding ADA2 were then measured. Results CECR1 mRNA expression levels were significantly higher in MDMs stimulated with ESAT6 and CFP10, than in the unstimulated MDMs. When stimulated with ESAT6, M-CSF-treated MDMs showed more pronounced CECR1 mRNA expression than GM-CSF-treated MDMs. Interferon-γ decreased the ESAT6- and CFP10-induced CECR1 mRNA expression in MDMs. CECR1 mRNA expression levels were positively correlated with mRNA expression of tumor necrosis factor α and interleukin 10, respectively. Conclusion ADA2 mRNA expression increased when MDMs were stimulated with MTB antigens alone. This partly indicates that pleural fluid ADA levels could increase in patients with culture-negative TPE. Our results may be helpful in improving the understanding of TPE pathogenesis.

  15. An STS in the human adenosine deaminase gene (located 20q12-q13. 11)

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    Freeman, B.C.; States, J.C. (Wayne State Univ., Detroit, MI (United States))

    1991-09-25

    The human adenosine deaminase gene has been characterized in detail. The adenosine gene product, as part of the purine catabolic pathway, catalyzes the irreversible deamination of adenosine and deoxyadenosine. Deficiency of this activity in humans is associated with an autosomal recessive form of severe combined immunodeficiency disease. Recently, this genetic deficiency disease has been targeted for the first attempts at gene therapy in humans. Using the polymerase chain reaction (PCR), a fragment of the expected size (160 bp) was amplified from human genomic DNA.

  16. Diagnostic value of serum adenosine deaminase levels in sputum smear negative pulmonary tuberculosis patients in Nepalese population

    Institute of Scientific and Technical Information of China (English)

    Anil Chander; Chandrika Devi Shrestha

    2012-01-01

    Objective: To assess the levels of adenosine deaminase (ADA) in serum in patients with sputum smear negative pulmonary tuberculosis (SNPTB) and to compare it with serum ADA levels in patients with non-tuberculous pulmonary disease - chronic obstructive pulmonary disease (COPD) and with healthy control group and to explore its validity as a diagnostic marker in serum in SNPTB patients.Methods:Three groups of study populations were made. Group I: SNPTB - 142 cases, Group II:non-tubercular pulmonary disease - COPD - 40 cases, Group III: healthy controls - 80 cases. Serum samples were collected and ADA assay was done by the method of Guisti and Galanti. Results: ADA levels (Mean±SD, U/L) in the three groups were as follows: Group I: 42.26±21.22, Group II: 23.31±8.22, Group III: 18.88±6.67. Difference between Group I and Group III was statistically significant (P < 0.0001). The test showed a high specificity 91.25% (95% confidence interval - CI 83.00 - 95.7) and a sensitivity of 83.10% (95% CI 76.08-88.37) in Group I. Positive predictive value, negative predictive value, positive likelihood ratio, negative likelihood ratio and accuracy in Group I were 94.00%, 69.52%, 9.49, 0.18 and 82.43% respectively.Conclusions: Overall assessment of the use of serum ADA levels as a diagnostic biochemical marker in smear-negative pulmonary tuberculosis patients showed promising results. Studies with a larger population group are required to validate its use as a routine diagnostic test in these cases.

  17. Evaluating of Serum Adenosine Deaminase Isoenzymes in Lung Contusion

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    Berrak Güven

    2013-05-01

    Full Text Available       Aim: We aimed to investigate the activity of ADA isoenzymes in serum of rats with lung contusion Material and Method: Lung contusion was induced in twelve male wistar albino rats by dropping a cylindrical weight from a height of 50 cm with a mobile platform positioned over the thorax. Rats were killed at 24 hour (n=6 and 72 hour (n=6 after contusion. ADA isoenzymes were measured in serum traumatic and control (n=6 (uninjured rats. Results: Our results indicated that serum total ADA activities were significantly decreased at 72 h after contusion. There was a significant decreased in ADA1 activity at 24 and 72 h after contusion when compared with controls. On the other hand, the increase in the ADA2 activity at 24 h and 72 h was not statistically significant. Discussion: In conclusion, serum ADA2 became predominant isozyme because of the inflammatory response in the lung contusion. However, further studies are needed to elucidate the regulatory mechanisms that effect the activity of serum ADA1.

  18. Analysis of cerebrospinal fluid adenosine deaminase levels in meningitis

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    Vyankatesh T. Anchinmane

    2016-09-01

    Results: The mean ADA levels in CSF were highest in TBM patients as compared to PM and AM. The sensitivity, specificity and accuracy of ADA were 96.15%, 92% and 94.11% respectively for detection TBM cases from non-tuberculous meningitis cases. Conclusions: Since ADA test is simple, rapid and inexpensive, it can be used as rapid diagnostic test for differential diagnosis of CSF and confirmation of TBM cases. [Int J Res Med Sci 2016; 4(9.000: 3855-3857

  19. Adenosine Deaminase Inhibition Prevents Clostridium difficile Toxin A-Induced Enteritis in Mice ▿

    Science.gov (United States)

    de Araújo Junqueira, Ana Flávia Torquato; Dias, Adriana Abalen Martins; Vale, Mariana Lima; Spilborghs, Graziela Machado Gruner Turco; Bossa, Aline Siqueira; Lima, Bruno Bezerra; Carvalho, Alex Fiorini; Guerrant, Richard Littleton; Ribeiro, Ronaldo Albuquerque; Brito, Gerly Anne

    2011-01-01

    Toxin A (TxA) is able to induce most of the classical features of Clostridium difficile-associated disease in animal models. The objective of this study was to determine the effect of an inhibitor of adenosine deaminase, EHNA [erythro-9-(2-hydroxy-3-nonyl)-adenine], on TxA-induced enteritis in C57BL6 mice and on the gene expression of adenosine receptors. EHNA (90 μmol/kg) or phosphate-buffered saline (PBS) was injected intraperitoneally (i.p.) 30 min prior to TxA (50 μg) or PBS injection into the ileal loop. A2A adenosine receptor agonist (ATL313; 5 nM) was injected in the ileal loop immediately before TxA (50 μg) in mice pretreated with EHNA. The animals were euthanized 3 h later. The changes in the tissue were assessed by the evaluation of ileal loop weight/length and secretion volume/length ratios, histological analysis, myeloperoxidase assay (MPO), the local expression of inducible nitric oxide synthase (NOS2), pentraxin 3 (PTX3), NF-κB, tumor necrosis factor alpha (TNF-α), and interleukin-1β (IL-1β) by immunohistochemistry and/or quantitative reverse transcription-PCR (qRT-PCR). The gene expression profiles of A1, A2A, A2B, and A3 adenosine receptors also were evaluated by qRT-PCR. Adenosine deaminase inhibition, by EHNA, reduced tissue injury, neutrophil infiltration, and the levels of proinflammatory cytokines (TNF-α and IL-1β) as well as the expression of NOS2, NF-κB, and PTX3 in the ileum of mice injected with TxA. ATL313 had no additional effect on EHNA action. TxA increased the gene expression of A1 and A2A adenosine receptors. Our findings show that the inhibition of adenosine deaminase by EHNA can prevent Clostridium difficile TxA-induced damage and inflammation possibly through the A2A adenosine receptor, suggesting that the modulation of adenosine/adenosine deaminase represents an important tool in the management of C. difficile-induced disease. PMID:21115723

  20. Novel deletion and a new missense mutation (Glu 217 Lys) at the catalytic site in two adenosine deaminase alleles of a patient with neonatal onset adenosine deaminase severe combined immunodeficiency

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    Hirschhorn, R.; Nicknam, M.N.; Eng, F.; Yang, D.R.; Borkowsky, W. (New York Univ. Medical School of Medicine, NY (United States))

    1992-11-01

    Mutations at the adenosine deaminase (ADA) locus result in a spectrum of disorders, encompassing a fulminant neonatal onset severe combined immunodeficiency (SCID) and childhood onset immunodeficiency, as well as apparently normal immune function. The extent of accumulation of the toxic metabolite, deoxyATP, correlates directly with severity of disease. The authors have now determined the mutations on both alleles of a child with fulminant, neonatal onset ADA SCID and accumulation of extremely high concentrations of deoxyATP. The genotype was consistent with the severely affected phenotype. One allele carried a large deletion that arose by non-homologous recombination and included the first five exons and promoter region. The second allele carried a missense mutation (G[sup 649]A) resulting in replacement of Glu[sup 217], an amino acid involved in the catalytic site, by Lys and predicting a major alteration in charge. Expression of the mutant cDNA on Cos cells confirmed that the mutation abolished enzyme activity. The authors have previously reported that a missense mutation at the preceding codon is similarly associated with neonatal onset ADA SCID and accumulation of extremely high deoxyATP. These findings suggest that genotype-phenotype correlations may be apparent for ADA SCID, despite the role that random variation in exposure to environmental pathogens may play in the initial phenotype. Such genotype-phenotype correlations may be important to consider in evaluating results of ongoing trials of [open quotes]gene[close quotes] and enzyme replacement therapy. 50 refs., 5 figs., 2 tabs.

  1. Magnetically assisted fluorescence ratiometric assays for adenosine deaminase using water-soluble conjusated polymers

    Institute of Scientific and Technical Information of China (English)

    HE Fang; YU MingHui; WANG Shu

    2009-01-01

    A magnetically assisted fluorescence ratiometric technique has been developed for adenosine deami-nase assays with high sensitivity using water-soluble cationic conjugated polymers (CCPs).The assay contains three elements:a biotin-labeled aptamer of adenosine (biotin-aptamer),a signaling probe single-stranded DNA-tagged fiuorescein at terminus (ssDNA-FI) and a CCP.The specific binding of adenosine to biotin-aptamer makes biotin-aptamer and ssDNA-FI unhybridized,and the ssDNA-FI is washed out after streptavidin-coated magnetic beads are added and separated from the assay solution under magnetic field.In this case,after the addition of CCP to the magnetic beads solution,the fluo-rescence resonance energy transfer (FRET) from CCP to fluorescein is inefficient.Upon adding adenosine deaminase,the adenosine is converted into inosine,and the biotin-aptamer is hybridized with ssDNA-FI to form doubled stranded DNA (biotin-dsDNA-FI).The ssONA-FI is attached to the mag-netic beads at the separation step,and the addition of CCP to the magnetic beads solution leads to efficient FRET from CCP to fluorescein.Thus the adenosine deaminase activity can be monitored by fluorescence spectra in view of the intensity decrease of CCP emission or the increase of fluorescein emission in aqueous solutions.The assay integrates surface-functionalized magnetic particles with significant amplification of detection signal of water-soluble cationic conjugated polymers.

  2. Evaluating of Serum Adenosine Deaminase Isoenzymes in Lung Contusion

    OpenAIRE

    2013-01-01

          Aim: We aimed to investigate the activity of ADA isoenzymes in serum of rats with lung contusion Material and Method: Lung contusion was induced in twelve male wistar albino rats by dropping a cylindrical weight from a height of 50 cm with a mobile platform positioned over the thorax. Rats were killed at 24 hour (n=6) and 72 hour (n=6) after contusion. ADA isoenzymes were measured in serum traumatic and control (n=6) (uninjured) rats. Results: Our results indica...

  3. Spectroscopy and computational studies on the interaction of octyl, dodecyl, and hexadecyl derivatives of anionic and cationic surfactants with adenosine deaminase.

    Science.gov (United States)

    Ajloo, Davood; Mahmoodabadi, Najmeh; Ghadamgahi, Maryam; Saboury, Ali Akbar

    2016-07-01

    Effects of sodium (octyl, dodecyl, hexadecyl) sulfate and their cationic analogous on the structure of adenosine deaminase (ADA) were investigated by fluorescence and circular dichroism spectroscopy as well as molecular dynamics simulation and docking calculation. Root-mean-square derivations, radius of gyration, solvent accessible surface area, and radial distribution function were obtained. The results showed that anionic and cationic surfactants reduce protein stability. Cationic surfactants have more effect on the ADA structure in comparison with anionic surfactants. More concentration and longer surfactants are parallel to higher denaturation. Furthermore, aggregation in the presence of anionic surfactants is more than cationic surfactants. Docking data showed that longer surfactants have more interaction energy and smaller ones bound to the active site.

  4. Adenosine deaminase enhances the immunogenicity of human dendritic cells from healthy and HIV-infected individuals.

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    Víctor Casanova

    Full Text Available ADA is an enzyme implicated in purine metabolism, and is critical to ensure normal immune function. Its congenital deficit leads to severe combined immunodeficiency (SCID. ADA binding to adenosine receptors on dendritic cell surface enables T-cell costimulation through CD26 crosslinking, which enhances T-cell activation and proliferation. Despite a large body of work on the actions of the ecto-enzyme ADA on T-cell activation, questions arise on whether ADA can also modulate dendritic cell maturation. To this end we investigated the effects of ADA on human monocyte derived dendritic cell biology. Our results show that both the enzymatic and non-enzymatic activities of ADA are implicated in the enhancement of CD80, CD83, CD86, CD40 and CCR7 expression on immature dendritic cells from healthy and HIV-infected individuals. These ADA-mediated increases in CD83 and costimulatory molecule expression is concomitant to an enhanced IL-12, IL-6, TNF-α, CXCL8(IL-8, CCL3(MIP1-α, CCL4(MIP-1β and CCL5(RANTES cytokine/chemokine secretion both in healthy and HIV-infected individuals and to an altered apoptotic death in cells from HIV-infected individuals. Consistently, ADA-mediated actions on iDCs are able to enhance allogeneic CD4 and CD8-T-cell proliferation, globally yielding increased iDC immunogenicity. Taken together, these findings suggest that ADA would promote enhanced and correctly polarized T-cell responses in strategies targeting asymptomatic HIV-infected individuals.

  5. Feed-Forward Inhibition of CD73 and Upregulation of Adenosine Deaminase Contribute to the Loss of Adenosine Neuromodulation in Postinflammatory Ileitis

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    Cátia Vieira

    2014-01-01

    Full Text Available Purinergic signalling is remarkably plastic during gastrointestinal inflammation. Thus, selective drugs targeting the “purinome” may be helpful for inflammatory gastrointestinal diseases. The myenteric neuromuscular transmission of healthy individuals is fine-tuned and controlled by adenosine acting on A2A excitatory receptors. Here, we investigated the neuromodulatory role of adenosine in TNBS-inflamed longitudinal muscle-myenteric plexus of the rat ileum. Seven-day postinflammation ileitis lacks adenosine neuromodulation, which may contribute to acceleration of gastrointestinal transit. The loss of adenosine neuromodulation results from deficient accumulation of the nucleoside at the myenteric synapse despite the fact that the increases in ATP release were observed. Disparity between ATP outflow and adenosine deficit in postinflammatory ileitis is ascribed to feed-forward inhibition of ecto-5′-nucleotidase/CD73 by high extracellular ATP and/or ADP. Redistribution of NTPDase2, but not of NTPDase3, from ganglion cell bodies to myenteric nerve terminals leads to preferential ADP accumulation from released ATP, thus contributing to the prolonged inhibition of muscle-bound ecto-5′-nucleotidase/CD73 and to the delay of adenosine formation at the inflamed neuromuscular synapse. On the other hand, depression of endogenous adenosine accumulation may also occur due to enhancement of adenosine deaminase activity. Both membrane-bound and soluble forms of ecto-5′-nucleotidase/CD73 and adenosine deaminase were detected in the inflamed myenteric plexus. These findings provide novel therapeutic targets for inflammatory gut motility disorders.

  6. Adenosine deaminase activity is a sensitive marker for the diagnosis of tuberculous pleuritis in patients with very low CD4 counts.

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    Kamaldeen Baba

    Full Text Available BACKGROUND: Adenosine Deaminase Activity (ADA is a commonly used marker for the diagnosis of tuberculous pleural effusion. There has been concern about its usefulness in immunocompromised patients, especially HIV positive patients with very low CD4 counts. The objective of this study was to evaluate the sensitivity of ADA in pleural fluid in patients with low CD4 counts. MATERIALS AND METHODS: This was a retrospective case control study. Medical files of patients with tuberculous pleuritis and non-tuberculous pleuritis were reviewed. Clinical characteristics, CD4 cell counts in blood and biochemical markers in pleural fluid, including ADA were recorded. RESULTS: One ninety seven tuberculous pleuritis and 40 non-tuberculous pleuritis patients were evaluated. Using the cut-off value of 30 U/L, the overall sensitivity, specificity, positive likelihood ratio, and negative likelihood ratio of ADA was 94%, 95%, 19, and 0.06 respectively. The mean CD4 cell counts among TB pleuritis patients was 29 and 153 cells/microL in patients with CD4 50 cells/microL, (p0.5. There was no correlation between ADA values and CD4 cell counts (r = -0.120, p = 0.369. CONCLUSION: ADA analysis is a sensitive marker of tuberculous pleuritis even in HIV patients with very low CD4 counts in a high TB endemic region. The ADA assay is inexpensive, rapid, and simple to perform and is of great value for the immediate diagnosis of tuberculous pleuritis while waiting for culture result and this has a positive impact on patient outcome.

  7. G22A Polymorphism of Adenosine Deaminase and its Association with Biochemical Characteristics of Gestational Diabetes Mellitus in an Iranian Population

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    Mohammad Ali Takhshid

    2015-03-01

    Full Text Available Adenosine deaminase (ADA is an important regulator of insulin action. The single nucleotide polymorphism (SNP G22A in the ADA gene decreases enzymatic activity of ADA. The aim of this study was to investigate the relationship between the SNP G22A and blood glycemic control, insulin resistance, and obesity of gestational diabetes mellitus (GDM patients in an Iranian population. SNP G22A was determined in women with GDM (N=70 and healthy pregnant women (control, N=70 using polymerase chain reaction-restriction fragment length polymorphism. Fasting plasma glucose (FPG, hemoglobin A1C (HbA1c, plasma insulin levels and plasma lipids were measured using commercial kits. Homeostasis model of assessment for insulin resistance (HOMA-IR was calculated. The distribution of genotypes and alleles among GDM patients was similar to that of the control group. FPG and HbA1c were significantly higher in GDM patients with GG genotype compared with GDM patients with GA+AA genotype and non-GDM patients. The frequency of GG genotype was significantly higher in obese GDM patients compared to lean GDM patients. The SNP G22A in the ADA gene was not associated with the risk of GDM in our population. GG genotype was associated with poor glycemic control and obesity in GDM patients.

  8. Hematopoietic stem cell gene therapy for adenosine deaminase-deficient severe combined immunodeficiency leads to long-term immunological recovery and metabolic correction.

    Science.gov (United States)

    Gaspar, H Bobby; Cooray, Samantha; Gilmour, Kimberly C; Parsley, Kathryn L; Zhang, Fang; Adams, Stuart; Bjorkegren, Emma; Bayford, Jinhua; Brown, Lucinda; Davies, E Graham; Veys, Paul; Fairbanks, Lynette; Bordon, Victoria; Petropoulou, Theoni; Petropolou, Theoni; Kinnon, Christine; Thrasher, Adrian J

    2011-08-24

    Genetic defects in the purine salvage enzyme adenosine deaminase (ADA) lead to severe combined immunodeficiency (SCID) with profound depletion of T, B, and natural killer cell lineages. Human leukocyte antigen-matched allogeneic hematopoietic stem cell transplantation (HSCT) offers a successful treatment option. However, individuals who lack a matched donor must receive mismatched transplants, which are associated with considerable morbidity and mortality. Enzyme replacement therapy (ERT) for ADA-SCID is available, but the associated suboptimal correction of immunological defects leaves patients susceptible to infection. Here, six children were treated with autologous CD34-positive hematopoietic bone marrow stem and progenitor cells transduced with a conventional gammaretroviral vector encoding the human ADA gene. All patients stopped ERT and received mild chemotherapy before infusion of gene-modified cells. All patients survived, with a median follow-up of 43 months (range, 24 to 84 months). Four of the six patients recovered immune function as a result of engraftment of gene-corrected cells. In two patients, treatment failed because of disease-specific and technical reasons: Both restarted ERT and remain well. Of the four reconstituted patients, three remained off enzyme replacement. Moreover, three of these four patients discontinued immunoglobulin replacement, and all showed effective metabolic detoxification. All patients remained free of infection, and two cleared problematic persistent cytomegalovirus infection. There were no adverse leukemic side effects. Thus, gene therapy for ADA-SCID is safe, with effective immunological and metabolic correction, and may offer a viable alternative to conventional unrelated donor HSCT.

  9. Inhibition of adenosine deaminase attenuates endotoxin-induced release of cytokines in vivo in rats.

    Science.gov (United States)

    Tofovic, S P; Zacharia, L; Carcillo, J A; Jackson, E K

    2001-09-01

    The purpose of this study was to investigate in vivo the effects of modulating the adenosine system on endotoxin-induced release of cytokines and changes in heart performance and neurohumoral status in early, profound endotoxemia in rats. Time/pressure variables of heart performance and blood pressure were recorded continuously, and plasma levels of tumor necrosis factor alpha (TNFalpha), interleukin 1-beta (IL-1beta), plasma renin activity (PRA), and catecholamines were determined before and 90 min after administration of endotoxin (30 mg/kg of lipopolysaccharide, i.v.). Erythro-9[2-hydroxyl-3-nonyl] adenine (EHNA; an adenosine deaminase inhibitor) had no effects on measured time-pressure variables of heart performance under baseline conditions and during endotoxemia, yet significantly attenuated endotoxin-induced release of cytokines and PRA. Pretreatment with the non-selective adenosine receptor antagonist DPSPX not only prevented the effects of EHNA but also increased the basal release of cytokines and augmented PRA. At baseline, caffeine (a non-selective adenosine receptor antagonist) increased HR, +dP/dtmax, heart rate x ventricular pressure product (HR x VPSP) and +dP/dtmax normalized by pressure (+dP/dtmax/VPSP), and these changes persisted during endotoxemia. Caffeine attenuated endotoxin-induced release of cytokines and augmented endotoxin-induced increases in plasma catecholamines and PRA. Pretreatment with propranolol abolished the effects of caffeine on heart performance and neurohumoral activation during the early phase of endotoxemia. 6N-cyclopentyladenosine (CPA; selective A1 adenosine receptor agonist) induced bradicardia and negative inotropic effects, reduced work load (i.e., decreased HR, VPSP, +dP/dtmax, +dP/dtmax/VPSP and HR x VPSP) and inhibited endotoxin-induced tachycardia and renin release. CGS 21680 (selective A2A adenosine receptor agonist) decreased blood pressure under basal condition but did not potentiate decreases in blood pressure

  10. [The involvement of adenosine and adenosine deaminase in experimental myocardial infarct].

    Science.gov (United States)

    Stratone, A; Busuioc, A; Roşca, V; Bazgan, L; Popa, M; Hăulică, I

    1989-01-01

    By the ligature of the left coronary artery in the rat anesthetized with nembutal (10 mg/100 i.p.) a significant increase of the 5'-nucleotidase activity (Wooton method) was noticed 10 minutes after the left ventricle infarction (from an average value of 1038.5 +/- 187 mU/g tissue to 1537 +/- 225 mU/g fresh tissue). The adenosine desaminase levels spectrophotometrically determined by Denstedt technique, do not appear significantly modified 10 or 30 minutes after the left ventricle infarction. The chromatographically determined adenosine levels, by HPLC technique, decrease from the average value of 11.63 +/- 1.4 micrograms/mg PT to 8.60 +/- 1.0 micrograms/mg PT 30 minutes after infarction. The observed changes are explained by the conditions of hypoxia in the infarcted ventricle which lead to the raise in adenosine levels by activating the 5'-nucleotidase and their depression by a very fast metabolism of the same substance.

  11. Determination of serum adenosine deaminase and xanthine oxidase levels in patients with crimean-congo hemorrhagic fever

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    V. Kenan Celik

    2010-01-01

    Full Text Available OBJECTIVE: Crimean-Congo hemorrhagic fever is an acute viral hemorrhagic fever with a high mortality rate. Despite increasing knowledge about hemorrhagic fever viruses, little is known about the pathogenesis of Crimean-Congo hemorrhagic fever. In this study, we measured serum adenosine deaminase and xanthine oxidase levels in Crimean-Congo hemorrhagic fever patients. METHODS: Serum adenosine deaminase levels were measured with a sensitive colorimetric method described by Giusti and xanthine oxidase levels by the method of Worthington in 30 consecutive hospitalized patients (mean age 42.6 ± 21.0. Laboratory tests confirmed their diagnoses of Crimean-Congo hemorrhagic fever. Thirty-five subjects (mean age 42.9 ± 19.1 served as the control group. RESULTS: There was a significant difference in adenosine deaminase and xanthine oxidase levels between cases and controls (p0.05. CONCLUSION: Adenosine deaminase and xanthine oxidase levels were increased in patients with Crimean-Congo hemorrhagic fever. Elevated serum xanthine oxidase activity in patients with Crimean-Congo hemorrhagic fever may be associated with reactive oxygen species generated by the xanthine/xanthine oxidase system during inflammatory responses. In addition, elevated lipid peroxidation may contribute to cell damage and hemorrhage. The association of cell damage and hemorrhage with xanthine oxidase activity should be further investigated in large-scale studies.

  12. High-sensitivity capillary electrophoresis method for monitoring purine nucleoside phosphorylase and adenosine deaminase reactions by a reversed electrode polarity switching mode.

    Science.gov (United States)

    Iqbal, Jamshed; Müller, Christa E

    2011-07-22

    A simple, efficient, and highly sensitive in-line CE method was developed for the characterization and for inhibition studies of the nucleoside-metabolizing enzymes purine nucleoside phosphorylase (PNP) and adenosine deaminase (ADA) present in membrane preparations of human 1539 melanoma cells. After filling the running buffer (50 mM borate buffer, 100 mM SDS, pH 9.10) into a fused-silica capillary (50 cm effective length × 75 μm), a large sample volume was loaded by hydrodynamic injection (5 psi, 36 s), followed by the removal of the large plug of sample matrix from the capillary using polarity switching (-20 kV). The current was monitored and the polarity was reversed when 95% of the current had been recovered. The separation of the neutral analytes (nucleosides and nucleobases) was performed by applying a voltage of 15 kV. An about 10-fold improvement of sensitivity for the five investigated analytes (adenosine, inosine, adenine, hypoxanthine, xanthine) was achieved by large-volume stacking with polarity switching when compared with CE without stacking. For inosine and adenine detection limits as low as 60 nM were achieved. To the best of our knowledge, this represents the highest sensitivity for nucleoside and nucleobase analysis using CE with UV detection reported so far. The Michaelis-Menten constants (K(m)) for PNP and ADA and the inhibition constants (K(i)) for standard inhibitors determined with the new method were consistent with literature data.

  13. The value of adenosine deaminase, interferon-gamma, and interferon-gamma induced protein of 10kD in the diagnosis of tuberculous pleuritis

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    Ya-kun DONG

    2015-07-01

    Full Text Available Objective To explore the value of adenosine deaminase (ADA activity, interferon-gamma (IFN-γ and IFN-γ induced protein of 10kD (IP-10 levels in pleural effusion for the diagnosis of tuberculous pleuritis. Methods ADA activity, IFN-γ and IP-10 levels in pleural effusion were determined in sixty-three patients with tuberculous pleuritis and 50 patients with malignant pleural effusion. Results The mean levels of ADA, IFN-γ and IP-10 in the tuberculous pleural effusion were significantly higher than those in malignant pleural effusion (P<0.01. When 45U/L was regarded as cut off value for ADA, the sensitivity, specificity and diagnostic odds ratio in the diagnosis of tuberculous pleurisy were 71.4%, 94.0% and 39.17 respectively. When 138.5pg/ml was regarded as cut off value for IFN-γ in tuberculous pleural effusion, the sensitivity, specificity and diagnostic odds ratio were 93.7%, 82.0% and 67.19 respectively. When 9.21μg/ml was regarded as cut off value for IP-10 in tuberculous pleural effusion, the sensitivity, specificity and diagnostic odds ratio were 85.7%, 90.0% and 54.00 respectively. The combined determination of the three markers for the diagnosis of tuberculous pleurisy had a sensitivity of 95.2%, specificity of 96.0% and diagnostic odds ratio of 72.16. Conclusion The accuracy of diagnosis for tuberculous pleurisy can be improved by combined determination of ADA, IFN-γ and IP-10. DOI: 10.11855/j.issn.0577-7402.2015.06.07

  14. A combination of the QuantiFERON-TB Gold In-Tube assay and the detection of adenosine deaminase improves the diagnosis of tuberculous pleural effusion.

    Science.gov (United States)

    Liu, Yuanyuan; Ou, Qinfang; Zheng, Jian; Shen, Lei; Zhang, Bingyan; Weng, Xinhua; Shao, Lingyun; Gao, Yan; Zhang, Wenhong

    2016-08-03

    The differential diagnosis of tuberculous pleural effusion (TPE) and malignant pleural effusion (MPE) remains difficult despite the availability of numerous diagnostic tools. The current study aimed to evaluate the performance of the whole blood QuantiFERON-TB Gold In-Tube (QFT-GIT) assay and conventional laboratory biomarkers in differential diagnosis of TPE and MPE in high tuberculosis prevalence areas. A total of 117 patients with pleural effusions were recruited, including 91 with TPE and 26 with MPE. All of the patients were tested with QFT-GIT, and the conventional biomarkers in both blood and pleural effusion were detected. The level of antigen-stimulated QFT-GIT in the whole blood of TPE patients was significantly higher than that of MPE (2.89 vs 0.33 IU/mL, Pdiagnosis of TPE were 93.0% and 60.0%, respectively. Among the biomarkers in blood and pleural effusion, pleural adenosine deaminase (ADA) was the most prominent biomarker, with a cutoff value of 15.35 IU/L. The sensitivity and specificity for the diagnosis of TPE were 93.4% and 96.2%, respectively. The diagnostic classification tree from the combination of these two biomarkers was 97.8% sensitive and 92.3% specific. Ultimately, the combination of whole blood QFT-GIT with pleural ADA improved both the specificity and positive predictive value to 100%. Thus, QFT-GIT is not superior to pleural ADA in the differential diagnosis of TPE and MPE. Combined whole blood QFT-GIT and pleural ADA detection can improve the diagnosis of TPE.

  15. Activity of cholinesterases, pyruvate kinase and adenosine deaminase in rats experimentally infected by Fasciola hepatica: Influences of these enzymes on inflammatory response and pathological findings.

    Science.gov (United States)

    Baldissera, Matheus D; Bottari, Nathieli B; Mendes, Ricardo E; Schwertz, Claiton I; Lucca, Neuber J; Dalenogare, Diessica; Bochi, Guilherme V; Moresco, Rafael N; Morsch, Vera M; Schetinger, Maria R C; Rech, Virginia C; Jaques, Jeandre A; Da Silva, Aleksandro S

    2015-11-01

    The aim of this study was to investigate acetylcholinesterase (AChE) in total blood and liver tissue; butyrylcholinesterase (BChE) in serum and liver tissue; adenosine deaminase (ADA) in serum and liver tissue; and pyruvate kinase (PK) in liver tissue of rats experimentally infected by Fasciola hepatica. Animals were divided into two groups with 12 animals each, as follows: group A (uninfected) and group B (infected). Samples were collected at 20 (A1 and B1;n=6 each) and 150 (A2 and B2; n=6 each) days post-infection (PI). Infected animals showed an increase in AChE activity in whole blood and a decrease in AChE activity in liver homogenates (P<0.05) at 20 and 150 days PI. BChE and PK activities were decreased (P<0.05) in serum and liver homogenates of infected animals at 150 days PI. ADA activity was decreased in serum at 20 and 150 days PI, while in liver homogenates it was only decreased at 150 days PI (P<0.05). Aspartate aminotransferase and alanine aminotransferase activities in serum were increased (P<0.05), while concentrations of total protein and albumin were decreased (P<0.05) when compared to control. The histological analysis revealed fibrous perihepatitis and necrosis. Therefore, we conclude that the liver fluke is associated with cholinergic and purinergic dysfunctions, which in turn may influence the pathogenesis of the disease.

  16. Correct splicing despite mutation of the invariant first nucleotide of a 5[prime] splice site: A possible basis for disparate clinical phenotypes in siblings with adenosine deaminase deficiency

    Energy Technology Data Exchange (ETDEWEB)

    Arredondo-Vega, F.X.; Santisteban, I.; Kelly, S.; Hershfield, M.S. (Duke Univ. Medical Center, Durham, NC (United States)); Umetsu, D.T. (Stanford Univ., CA (United States)); Schlossman, C.M.

    1994-05-01

    Adenosine deaminase (ADA) deficiency usually causes severe combined immune deficiency in infancy. Milder phenotypes also occur and are associated with less severely impaired deoxyadenosine (dAdo) catabolism. The authors have characterized the mutations responsible for ADA deficiency in siblings with disparity in clinical phenotype. Erythrocyte dAdo nucleotide pool size, which reflects total residual ADA activity, was lower in the older, more mildly affected sib (RG) than in her younger, more severely affected sister (EG). Cultured T cells, fibroblasts, and B lymphoblasts of RG had detectable residual ADA activity, while cells of EG did not. ADA mRNA was undetectable by northern analysis in cells of both patients. Both sibs were found to be compound heterozygotes for the following novel splicing defects: (1) a G[sup +1][yields]A substitution at the 5' splice site of IVS 2 and (2) a complex 17-bp rearrangement of the 3' splice site of IVS 8, which inserted a run of seven purines into the polypyrimidine tract and altered the reading frame of exon 9. PCR-amplified ADA cDNA clones with premature translation stop codons arising from aberrant pre-mRNA splicing were identified, which were consistent with these mutations. However, some cDNA clones from T cells of both patients and from fibroblasts and Epstein-Barr virus (EBV)-transformed B cells of RG, were normally spliced at both the exon 2/3 and exon 8/9 junctions. A normal coding sequence was documented for clones from both sibs. The normal cDNA clones did not appear to arise from either contamination or PCR artifact, and mosaicism seems unlikely to have been involved. These findings suggest (1) that a low level of normal pre-mRNA splicing may occur despite mutation of the invariant first nucleotide of the 5' splice sequence and (2) that differences in efficiency of such splicing may account for the difference in residual ADA activity, immune dysfunction, and clinical severity in these siblings. 66 refs

  17. Adenosine deaminase acting on RNA-1 (ADAR1 inhibits HIV-1 replication in human alveolar macrophages.

    Directory of Open Access Journals (Sweden)

    Michael D Weiden

    Full Text Available While exploring the effects of aerosol IFN-γ treatment in HIV-1/tuberculosis co-infected patients, we observed A to G mutations in HIV-1 envelope sequences derived from bronchoalveolar lavage (BAL of aerosol IFN-γ-treated patients and induction of adenosine deaminase acting on RNA 1 (ADAR1 in the BAL cells. IFN-γ induced ADAR1 expression in monocyte-derived macrophages (MDM but not T cells. ADAR1 siRNA knockdown induced HIV-1 expression in BAL cells of four HIV-1 infected patients on antiretroviral therapy. Similar results were obtained in MDM that were HIV-1 infected in vitro. Over-expression of ADAR1 in transformed macrophages inhibited HIV-1 viral replication but not viral transcription measured by nuclear run-on, suggesting that ADAR1 acts post-transcriptionally. The A to G hyper-mutation pattern observed in ADAR1 over-expressing cells in vitro was similar to that found in the lungs of HIV-1 infected patients treated with aerosol IFN-γ suggesting the model accurately represented alveolar macrophages. Together, these results indicate that ADAR1 restricts HIV-1 replication post-transcriptionally in macrophages harboring HIV-1 provirus. ADAR1 may therefore contribute to viral latency in macrophages.

  18. Fine mapping and functional activity of the adenosine deaminase origin in murine embryonic fibroblasts.

    Science.gov (United States)

    Sibani, Sahar; Rampakakis, Emmanouil; Di Paola, Domenic; Zannis-Hadjopoulos, Maria

    2008-06-01

    DNA replication initiates at origins within the genome. The late-firing murine adenosine deaminase (mAdA) origin is located within a 2 kb fragment of DNA, making it difficult to examine by realtime technology. In this study, fine mapping of the mAdA region by measuring the abundance of nascent strand DNA identified two origins, mAdA-1 and mAdA-C, located 397 bp apart from each other. Both origins conferred autonomous replication to plasmids transfected in murine embryonic fibroblasts (MEFs), and exhibited similar activities in vivo and in vitro. Furthermore, both were able to recruit the DNA replication initiator proteins Cdc6 and Ku in vitro, similar to other bona fide replication origins. When tested in a murine Ku80(-/-) cell line, both origins exhibited replication activities comparable to those observed in wildtype cells, as did the hypoxanthine-guanine phosphoribosyltransferase (HPRT) and c-myc origins. This contrasts with previously published studies using Ku80-deficient human cells lines and suggests differences in the mechanism of initiation of DNA replication between the murine and human systems.

  19. Towards a rAAV-based gene therapy for ADA-SCID: from ADA deficiency to current and future treatment strategies.

    Science.gov (United States)

    Silver, Jared N; Flotte, Terence R

    2008-07-01

    Adenosine deaminase deficiency fosters a rare, devastating pediatric immune deficiency with concomitant opportunistic infections, metabolic anomalies and multiple organ system pathology. The standard of care for adenosine deaminase deficient severe combined immune deficiency (ADA-SCID) includes enzyme replacement therapy or bone marrow transplantation. Gene therapies for ADA-SCID over nearly two decades have exclusively involved retroviral vectors targeted to lymphocytes and hematopoetic progenitors. These groundbreaking gene therapies represent a revolution in clinical medicine, but come with several challenges, including the risk of insertional mutagenesis. An alternative gene therapy for ADA-SCID may utilize recombinant adeno-associated virus vectors in vivo, with numerous target tissues, to foster ectopic expression and secretion of adenosine deaminase. This review endeavors to describe ADA-SCID, the traditional treatments, previous retroviral gene therapies, and primarily, alternative recombinant adeno-associated virus-based strategies to remedy this potentially fatal genetic disease.

  20. Diagnostic value of combinative detection of serum carcinoembryonic antigen(CEA),adenosine deaminase(ADA),lactate dehydrogenase(LDH) and ESR in differential diagnosis of pleural effusion%联合检测CEA、ADA、LDH及血沉对胸腔积液性质判断的临床意义

    Institute of Scientific and Technical Information of China (English)

    夏静; 闫雪波; 刘荣玉

    2013-01-01

    Objective To establish the diagnostic value of combinative detection of serum CEA,serum and pleural fluid LDH,pleural fluid ADA and ESR in different pleural effusion patients. Methods From December 2011 to June 2012 ,89 cases of in-patients with pleural effusion in the First Affiliated Hospital of Anhui Medical University were chosen,including 25 cases of tuberculous effusion( TE ),42 patients with malignant pleural effusion( MPE ) and 22 cases of inflammatory patients with pleural effusion( IPE ). The levels of serum CEA were examined by electrochemilumin-escence immunoassay method, serum LDH by the enzymatic( L method ), pleural fluid LDH and ADA by rating method and ESR by Westergren. Results The serum CEA of malignant pleural effusion patients is higher than that of TE and IPE patients;The serum and pleural fluid LDH levels in TE,MPE,IPE patients showed no significant difference,but the three pleural effusion LDH levels were significantly higher than the normal range, and the ratio of pleural effusion and serum LDH in patients with TE was significantly higher than that of patients with MPE; The pleural fluid ADA levels of TE were significantly higher than those of the MPE and IPE; The IPE patients ESR levels were significantly higher than those of TE and MPE patients, and ESR levels of TE patients were significantly higher than those of MPE patients. Conclusion Combined detection of serum CEA, pleural fluid and serum LDH, pleural fluid ADA and ESR has great significance in judging the nature of pleural fluid.%目的 探讨联合检测血清癌胚抗原(CEA)、血清及胸水乳酸脱氢酶(LDH)、胸水腺苷脱氨酶(ADA)及血沉对胸腔积液性质判断的临床意义.方法 以安徽医科大学第一附属医院2011年12月至2012年6月89例住院胸腔积液患者为研究对象,其中25例结核性胸腔积液患者,42例恶性胸腔积液患者,22例炎性胸腔积液患者;采用电化学发光免疫分析法测定血清CEA,酶法(L法)测定血

  1. Association of G22A and A4223C ADA1 gene polymorphisms and ADA activity with PCOS.

    Science.gov (United States)

    Salehabadi, Mahshid; Farimani, Marzieh; Tavilani, Heidar; Ghorbani, Marzieh; Poormonsefi, Faranak; Poorolajal, Jalal; Shafiei, Gholamreza; Ghasemkhani, Neda; Khodadadi, Iraj

    2016-06-01

    Adenosine deaminase-1 (ADA1) regulates the concentration of adenosine as the main modulator of oocyte maturation. There is compelling evidence for the association of ADA1 gene polymorphisms with many diseases but the importance of ADA1 polymorphisms in polycystic ovary syndrome (PCOS) has not been studied before. This study investigates serum total ADA activity (tADA), ADA1 and ADA2 isoenzyme activities, and genotype and allele frequencies of G22A and A4223C polymorphisms in healthy and PCOS women. In this case-control study 200 PCOS patients and 200 healthy women were enrolled. Genomic DNA was extracted from whole blood and the PCR-RFLP technique was used to determine the G22A and A4223C variants. The genotype frequencies were calculated and the association between polymorphic genotypes and enzyme activities were determined. tADA activity was significantly lower in the PCOS group compared with the control group (27.76±6.0 vs. 39.63±7.48, respectively). PCOS patients also showed reduced activity of ADA1 and ADA2. PCOS was not associated with G22A polymorphism whereas AA, AC, and CC genotypes of A4223C polymorphism were found distributed differently between the control and the PCOS women where the C allele showed a strong protective role for PCOS (odds ratio=1.876, p=0.033). The present study for the first time showed that lower ADA activity may be involved in pathogenesis of PCOS by maintaining a higher concentration of adenosine affecting follicular growth. As a novel finding, we also showed great differences in genotype distribution and allele frequencies of A4223C polymorphism between groups indicating a protective role for C allele against PCOS. AbbreviationsADA: adenosine deaminase PCOS: polycystic ovary syndrome PCR-RFLP: polymerase chain reaction-restriction fragment length polymorphism tADA: total adenosine deaminase.

  2. The G22A Polymorphism of the ADA Gene and Susceptibility to Autism Spectrum Disorders

    Science.gov (United States)

    Hettinger, Joe A.; Liu, Xudong; Holden, Jeanette Jeltje Anne

    2008-01-01

    Inborn errors of purine metabolism have been implicated as a cause for some cases of autism. This hypothesis is supported by the finding of decreased adenosine deaminase (ADA) activity in the sera of some children with autism and reports of an association of the A allele of the ADA G22A (Asp8Asn) polymorphism in individuals with autism of…

  3. Pleural effusion adenosine deaminase: a candidate biomarker to discriminate between Gram-negative and Gram-positive bacterial infections of the pleural space

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    Ruolin Li

    2016-05-01

    Full Text Available OBJECTIVES: Delay in the treatment of pleural infection may contribute to its high mortality. In this retrospective study, we aimed to evaluate the diagnostic accuracy of pleural adenosine deaminase in discrimination between Gram-negative and Gram-positive bacterial infections of the pleural space prior to selecting antibiotics. METHODS: A total of 76 patients were enrolled and grouped into subgroups according to Gram staining: 1 patients with Gram-negative bacterial infections, aged 53.2±18.6 years old, of whom 44.7% had empyemas and 2 patients with Gram-positive bacterial infections, aged 53.5±21.5 years old, of whom 63.1% had empyemas. The pleural effusion was sampled by thoracocentesis and then sent for adenosine deaminase testing, biochemical testing and microbiological culture. The Mann-Whitney U test was used to examine the differences in adenosine deaminase levels between the groups. Correlations between adenosine deaminase and specified variables were also quantified using Spearman’s correlation coefficient. Moreover, receiver operator characteristic analysis was performed to evaluate the diagnostic accuracy of pleural effusion adenosine deaminase. RESULTS: Mean pleural adenosine deaminase levels differed significantly between Gram-negative and Gram-positive bacterial infections of the pleural space (191.8±32.1 U/L vs 81.0±16.9 U/L, p<0.01. The area under the receiver operator characteristic curve was 0.689 (95% confidence interval: 0.570, 0.792, p<0.01 at the cutoff value of 86 U/L. Additionally, pleural adenosine deaminase had a sensitivity of 63.2% (46.0-78.2%; a specificity of 73.7% (56.9-86.6%; positive and negative likelihood ratios of 2.18 and 0.50, respectively; and positive and negative predictive values of 70.6% and 66.7%, respectively. CONCLUSIONS: Pleural effusion adenosine deaminase is a helpful alternative biomarker for early and quick discrimination of Gram-negative from Gram-positive bacterial infections of the

  4. Crystallization and preliminary X-ray crystallographic analysis of the tRNA-specific adenosine deaminase from Streptococcus pyogenes

    Energy Technology Data Exchange (ETDEWEB)

    Ku, Min-Je [Functional Proteomics Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791 (Korea, Republic of); Lee, Won-Ho [Functional Proteomics Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791 (Korea, Republic of); Biotechnology and Genetic Engineering, Korea University, Seoul 136-701 (Korea, Republic of); Nam, Ki-hyun; Rhee, Kyeong-hee [Biomedical Research Center, Life Science Division, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791 (Korea, Republic of); Lee, Ki-Seog [Biotechnology and Genetic Engineering, Korea University, Seoul 136-701 (Korea, Republic of); Kim, Eunice EunKyung [Biomedical Research Center, Life Science Division, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791 (Korea, Republic of); Yu, Myung-Hee [Functional Proteomics Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791 (Korea, Republic of); Hwang, Kwang Yeon, E-mail: hwangky@kist.re.kr [Biomedical Research Center, Life Science Division, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791 (Korea, Republic of); Functional Proteomics Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791 (Korea, Republic of)

    2005-04-01

    The tRNA-specific adenosine deaminase from the pathogenic bacteria S. pyogenes has been overexpressed and crystallized. The tRNA-specific adenosine deaminase from the pathogenic bacteria Streptococcus pyogenes (spTAD) has been overexpressed in Escherichia coli and crystallized in the presence of Zn{sup 2+} ion at 295 K using ammonium sulfate as a precipitant. Flash-cooled crystals of spTAD diffracted to 2.0 Å using 30%(v/v) glycerol as a cryoprotectant. X-ray diffraction data have been collected to 2.0 Å using synchrotron radiation. The crystal belongs to the tetragonal space group P4{sub 2}2{sub 1}2, with unit-cell parameters a = b = 81.042, c = 81.270 Å. The asymmetric unit contains one subunit of spTAD, with a corresponding crystal volume per protein weight (V{sub M}) of 3.3 Å{sup 3} Da{sup −1} and a solvent content of 62.7%.

  5. Adenosine modulation of [Ca2+]i in cerebellar granular cells: multiple adenosine receptors involved.

    Science.gov (United States)

    Vacas, Javier; Fernández, Mercedes; Ros, Manuel; Blanco, Pablo

    2003-12-01

    Elimination of adenosine by addition of adenosine deaminase (ADA) to the media leads to alterations in intracellular free calcium concentration ([Ca(2+)](i)) in cerebellar granular cells. Adenosine deaminase brings about increases or decreases in [Ca(2+)](i) depending on the previous activation state of the cell. These effects are dependent on the catalytic activity of adenosine deaminase, since its previous catalytic inactivation with Hg(2+) prevents the above-mentioned changes in intracellular calcium. Extracellular calcium is required for the increase in [Ca(2+)](i) promoted by ADA. This rise is insensitive to thapsigargin, but sensitive to micromolar concentrations of Ni(2+). Toxins specific for L, N and P/Q calcium channels do not overtly reduce this effect. N(6)-Cyclopentyl adenosine (CPA), an A(1) receptor agonist, produces a partial reversion of ADA effects, while CGS21680, A(2A)/A(2B) receptor agonist, slightly enhances them. Expression of A(1), A(2A), A(2B) and A(3) adenosine receptor mRNAs was detected in cerebellar granular cell cultures. These results suggest that adenosine modulate [Ca(2+)](i) in cerebellar granule cells through different adenosine receptor subtypes which, at least in part, seem to act through R-type calcium channels.

  6. Dosagem sérica de adenosina deaminase em lúpus eritematoso sistêmico: ausência de associação com atividade de doença Levels of serum adenosine deaminase in systemic lupus erythematosus: lack of association with disease activity

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    Isabella Lima

    2005-10-01

    Full Text Available O lúpus eritematoso sistêmico (LES é uma doença inflamatória auto-imune, que evolui intercalando períodos de atividade e remissão. OBJETIVO: avaliar a associação da dosagem sérica de adenosina deaminase (ADA e atividade do LES, segundo os critérios do SLEDAI 2K - Systemic lupus erythematosus disease activity index. MÉTODOS: avaliou-se 82 pacientes com LES atendidos em um hospital de referência para o tratamento do LES em Salvador, BA, Brasil. A atividade de doença foi determinada pelo SLEDAI 2K e a dosagem sérica da ADA realizada por colorimetria. RESULTADOS: oitenta e uma pacientes (98,78% eram do sexo feminino e a idade média foi de 35,07±11,73 anos. O escore de SLEDAI médio foi de 11,66±5,89; a média de ADA sérica foi de 38,24±13,61U/l; C3 de 91,93±27,39 mg/dl; C4 de 15,17±5,77 mg/dl e a pesquisa de anticorpos anti-DNA nativo (aDNAn foi positiva em 31 casos (37,8%. Não houve correlação entre os níveis séricos de ADA e escore do SLEDAI. A ADA sérica correlacionou-se inversamente com C4 (r=-0,336 e p=0,001. CONCLUSÕES: no presente estudo a dosagem sérica de ADA não se associou a atividade de doença segundo os critérios do SLEDAI 2K, sugerindo que esse teste não deve ser utilizado como marcador de atividade de doença em LES. Esse resultado diverge da maioria dos trabalhos publicados, o que pode ser explicado pela dificuldade de padronização da técnica de dosagem da ADA ou por diferença nas diversas populações estudadas.Systemic lupus erythematosus (SLE is an autoimmune inflammatory disease, with a variable course and characterized by periods of remissions and exacerbations. OBJECTIVE: To evaluate the association between serum adenosine deaminase (ADA levels and disease activity in SLE. METHODS: Eighty two SLE patients seen at Santa Izabel Hospital in Salvador, BA, Brazil, were studied. Disease activity was measured by SLEDAI 2K- Systemic Lupus Erythematosus Disease Activity Index, and serum ADA was

  7. The genetics of feto-placental development: A study of acid phosphatase locus 1 and adenosine deaminase polymorphisms in a consecutive series of newborn infants

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    Bergamaschi Antonio

    2008-09-01

    Full Text Available Abstract Background Acid phosphatase locus 1 and adenosine deaminase locus 1 polymorphisms show cooperative effects on glucose metabolism and immunological functions. The recent observation of cooperation between the two systems on susceptibility to repeated spontaneous miscarriage prompted us to search for possible interactional effects between these genes and the correlation between birth weight and placental weight. Deviation from a balanced development of the feto-placental unit has been found to be associated with perinatal morbidity and mortality and with cardiovascular diseases in adulthood. Methods We examined 400 consecutive newborns from the Caucasian population of Rome. Birth weight, placental weight, and gestational length were registered. Acid phosphatase locus 1 and adenosine deaminase locus 1 phenotypes were determined by starch gel electrophoresis and correlation analysis was performed by SPSS programs. Informed verbal consent to participate in the study was obtained from the mothers. Results Highly significant differences in birth weight-placental weight correlations were observed among acid phosphatase locus 1 phenotypes (p = 0.005. The correlation between birth weight and placental weight was markedly elevated in subjects carrying acid phosphatase locus 1 phenotypes with medium-low F isoform concentration (A, CA and CB phenotypes compared to those carrying acid phosphatase locus 1 phenotypes with medium-high F isoform concentration (BA and B phenotypes (p = 0.002. Environmental and developmental variables were found to exert a significant effect on birth weight-placental weight correlation in subjects with medium-high F isoform concentrations, but only a marginal effect was observed in those with medium-low F isoform concentrations. The correlation between birth weight and placental weight is higher among carriers of the adenosine deaminase locus 1 allele*2, which is associated with low activity, than in homozygous adenosine

  8. 腺苷脱氨酶在儿童结核性胸膜炎的诊断意义%Clinical significance of adenosine deaminase in tuberculosis pleuritis in children

    Institute of Scientific and Technical Information of China (English)

    王维; 彭小霞; 崔虹艳; 刘辉; 杨海明; 赵顺英

    2015-01-01

    Objective To explore the clinical significance of adenosine deaminase ( ADA) in pleural ef-fusion for diagnosis of tuberculosis pleuritis in children. Methods The level of ADA in pleural effusion was ret-rospectively analyzed in 28 cases with purulent pleuritis,thirty-four cases with mycoplasma pneumoniae pleuri-tis,forty-five cases with tuberculosis pleuritis from July 2011 to January 2014 in Beijing Children′s Hospital Af-filiated to Capital Medical University. Results The level of ADA in three groups was expressed by median (range interquartile). ADA in the purulent pleuritis group [126. 35 (76. 80,178. 13)U/L]was higher than the group of mycoplasma pneumoniae pleuritis [ 55. 55 ( 42. 80, 79. 03 ) U/L ] and tuberculosis pleuritis [ 26. 50 (22. 05,50. 95)U/L]. The difference was statistically significant (P< 0. 01). The cut-off value of pleural effu-sion ADA for diagnosis of tuberculosis pleuritis is not available by application of ROC curve. Conclusion Higher ADA value is not only the characteristic of tuberculosis pleuritis,but also purulent pleuritis and mycoplas-ma pneumoniae pleuritis. ADA has no clinical value in diagnosis of tuberculosis pleuritis in children.%目的:探讨胸腔积液中腺苷脱氨酶( adenosine deaminase,ADA)在儿童结核性胸膜炎的诊断意义。方法回顾性分析2011年7月至2014年1月在首都医科大学附属北京儿童医院呼吸科住院治疗、临床诊断明确的28例化脓性胸膜炎、34例肺炎支原体性胸膜炎及45例结核性胸膜炎患儿胸腔积液中ADA检测值。结果三组的ADA检测值用中位数(四分位间距)表示,化脓性胸膜炎组为126.35(76.80,178.13)U/L,高于肺炎支原体性胸膜炎组55.55(42.80,79.03)U/L 和结核性胸膜炎组26.50(22.05,50.95)U/L。三组比较差异有统计学意义(P<0.01)。应用ROC曲线未能得出ADA诊断结核性胸膜炎的最佳临界值。结论胸腔积液中ADA检测值升高并不是

  9. Partial resolution of bone lesions. A child with severe combined immunodeficiency disease and adenosine deaminase deficiency after enzyme-replacement therapy

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    Yulish, B.S.; Stern, R.C.; Polmar, S.H.

    1980-01-01

    A child with severe combined immunodeficiency disease and adenosine deaminase deficiency, with characteristic bone dysplasia, was treated with transfusions of frozen irradiated RBCs as a means of enzyme replacement. This therapy resulted in restoration of immunologic competence and partial resolution of the bone lesions. Although the natural history of these lesions without therapy is not known, enzyme-replacement therapy may have played a role in the resolution of this patient's bone lesions.

  10. Two Cases of Severe Combined Immunodeficiency Caused By Adenosine Deaminase Deficiency

    Directory of Open Access Journals (Sweden)

    Turkan Patiroglu

    2014-08-01

    Full Text Available Severe Combined Immune Deficiency (SCID is a primary immune deficiency disorder manifested with severe infections upon first months of life, which is characterized by diverse genetic defects in T and B lymphocyte functions and occasionally in NK cells. ADA deficiency is a form of SCID progressing with severe lymphopenia and immune deficiency caused by toxic metabolites of ADA. Bone marrow transplantation (BMT is the only curative treatment although prophylactic anti-microbial therapy, intravenous immunoglobulin (IVIG and enzyme replacement can achieve transient improvements. Early diagnosis before development of severe infections and organ injury and referral to pediatric immunology clinics will make considerable contributions to prognosis. Here, we presented 2 cousins with SCID who had positive family history with deceased sibling; presented with tanning at skin, severe neonatal infections and Q246X (c736C>T non-sense mutation in exon 8 in ADA gene  in order to emphasize this rare mutation and pediatric emergencies associated with this disorder.

  11. Joint detection of adenosine deaminase activity and IFN-γ in the application of the identification diagnosis on tuberculous pleurisy%腺苷脱氨酶和干扰素-γ联合检测在结核性胸膜炎鉴别诊断中的应用

    Institute of Scientific and Technical Information of China (English)

    刘莉敏; 李玉磊; 谢艳丽; 王以炳; 李琪

    2012-01-01

    目的 研究腺苷脱氨酶(ADA)和干扰素-γ联合检测对结核性胸膜炎诊断价值.方法 检测60例呼吸内科患者胸腔积液中ADA活性和干扰素-γ水平.并绘制ADA活性和干扰素-γ水平两者单项指标的ROC曲线.结果结核性胸液组的ADA和干扰素-γ高于恶性胸液组(P<0.001);ROC曲线显示两项指标均具有较高的敏感性和特异性,ADA的诊断价值高于IFN-γ;ADA和干扰素-γ联合检测优于单项.结论 ADA检测可作为结核性胸膜炎的重要指标,ADA和IFN-γ联合检测可以提高诊断试验的效率.%Objective To research the identification and diagnosis value of the joint detection of adenosine deaminase activity and IFN-γ on tuberculous pleurisy. Methods ADA activity and IFN-γ were detected in 60 respiration medicine patients' pleural effusion and the ROC curve of single index between ADA activity and IFN--γ was draw. Results The pleural fluid levels of adenosine deaminase and IFN-γ were significantly higher in the tuberculous pleufitis group than that in the malignant pleuritis group ( P < 0. 001 ). ROC curve showed that two indexes both had the character of sensibility and specificity. The diagnosis value of ADA was higher than that of IFN-γ and joint detection was better than the single index. Conclusion Detection of ADA in pleural fluid can be regarded as one important index to diagnose tuberculous pleurisy. Joint detection of adenosine deaminase activity and interleron-γ in tuberculous pleural effusions can improve the efficiency of diagnostic tests.

  12. Circulating type 1 vaccine-derived poliovirus may evolve under the pressure of adenosine deaminases acting on RNA.

    Science.gov (United States)

    Liu, Yanhan; Ma, Tengfei; Liu, Jianzhu; Zhao, Xiaona; Cheng, Ziqiang; Guo, Huijun; Xu, Ruixue; Wang, Shujing

    2015-01-01

    Poliovirus, the causative agent of poliomyelitis, is a human enterovirus and member of the Picornaviridae family. An effective live-attenuated poliovirus vaccine strain (Sabin 1) has been developed and has protected humans from polio. However, a few cases of vaccine virulence reversion have been documented in several countries. For instance, circulating type 1 vaccine-derived poliovirus is a highly pathogenic poliovirus that evolved from an avirulent strain, but the mechanism by which vaccine strains undergo reversion remains unclear. In this study, vaccine strains exhibited A to G/U to C and G to A/C to U hypermutations in the reversed evolution of Sabin 1. Furthermore, the mutation ratios of U to C and C to U were higher than those of other mutation types. Dinucleotide editing context was then analyzed. Results showed that A to G and U to C mutations exhibited preferences similar to adenosine deaminases acting on RNA (ADAR). Hence, ADARs may participate in poliovirus vaccine evolution.

  13. Crystallization and preliminary X-ray crystallographic analysis of adenosine 5′-monophosphate deaminase (AMPD) from Arabidopsis thaliana in complex with coformycin 5′-phosphate

    Energy Technology Data Exchange (ETDEWEB)

    Han, Byung Woo [Department of Biochemistry, University of Wisconsin-Madison, WI 53706-1544 (United States); Center for Eukaryotic Structural Genomics (CESG), University of Wisconsin-Madison, WI 53706-1549 (United States); Bingman, Craig A. [Center for Eukaryotic Structural Genomics (CESG), University of Wisconsin-Madison, WI 53706-1549 (United States); Mahnke, Donna K.; Sabina, Richard L. [Department of Biochemistry, The Medical College of Wisconsin, Milwaukee, WI 53226-4801 (United States); Phillips, George N. Jr, E-mail: phillips@biochem.wisc.edu [Department of Biochemistry, University of Wisconsin-Madison, WI 53706-1544 (United States); Center for Eukaryotic Structural Genomics (CESG), University of Wisconsin-Madison, WI 53706-1549 (United States)

    2005-08-01

    Adenosine 5′-monophosphate deaminase from A. thaliana has been crystallized in complex with coformycin 5′-phosphate. Diffraction data have been collected to 3.34 Å resolution. Adenosine 5′-monophosphate deaminase (AMPD) is a eukaryotic enzyme that converts adenosine 5′-monophosphate (AMP) to inosine 5′-monophosphate (IMP) and ammonia. AMPD from Arabidopsis thaliana (AtAMPD) was cloned into the baculoviral transfer vector p2Bac and co-transfected along with a modified baculoviral genome into Spodoptera frugiperda (Sf9) cells. The resulting recombinant baculovirus were plaque-purified, amplified and used to overexpress recombinant AtAMPD. Crystals of purified AtAMPD have been obtained to which coformycin 5′-phosphate, a transition-state inhibitor, is bound. Crystals belong to space group P6{sub 2}22, with unit-cell parameters a = b = 131.325, c = 208.254 Å, α = β = 90, γ = 120°. Diffraction data were collected to 3.34 Å resolution from a crystal in complex with coformycin 5′-phosphate and to 4.05 Å resolution from a crystal of a mercury derivative.

  14. Serum activities of adenosine deaminase, dipeptidyl peptidase IV and prolyl endopeptidase in patients with fibromyalgia: diagnostic implications.

    Science.gov (United States)

    Čulić, Ognjen; Cordero, Mario D; Žanić-Grubišić, Tihana; Somborac-Bačura, Anita; Pučar, Lara Batičić; Detel, Dijana; Varljen, Jadranka; Barišić, Karmela

    2016-10-01

    Fibromyalgia (FM) is a chronic pain syndrome with number of symptoms that present challenge in terms of diagnosis and treatment. Patients with FM show abnormal profile of purines in plasma. In this work, we measured serum activities of enzymes involved in purine metabolism, namely total adenosine deaminase (ADE) and its isoforms (ADE1 and ADE2), ecto-ATPase, and 5'-nucleotidase (5'-NT). We also measured activity of dipeptidyl peptidase IV (DPPIV) and prolyl endopeptidase (PEP). Spectrophotometric and fluorometric methods were used for enzyme activity determinations. Enzyme activities were measured in sera of 24 patients with FM that were not undergoing pharmacological treatment during the study. Control group comprised 32 healthy control subjects. Significantly higher activities of total ADE (P = 0.025) and ADE2 (P = 0.011) were observed in FM patients, while no significant differences in ADE1, ecto-ATPase, and 5'-NT activities (P > 0.05) were found when compared to healthy controls. Moreover, increase in the activity of DPPIV (P = 0.015) and lower activity of PEP (P = 0.011) were also found in the FM group. ROC analysis pointed to different diagnostic sensitivities/specificities for individual enzyme activities measured as follows: ADE (50.0/87.5), ADE2 (41.7/90.6), DPPIV (62.5/71.9), and PEP (83.3/62.5). ADE2 and PEP were shown to be independent predictors of FM, while combination of the two gives AUC of 0.786 (95 % confidence interval of 0.656-0.885, P < 0.05). Our results are showing that serum activities of ADE2 and PEP could be useful as biomarkers for FM diagnosis. However, relatively low diagnostic sensitivity of ADE2 and specificity of PEP must be taken into account.

  15. 结核性脑膜炎患儿脑脊髓液中腺苷脱氨酶活性测定的临床意义%Clinical Significance of Cerebrospinal Fluid Adenosine Deaminase of Children with Tuberculous Meningitis

    Institute of Scientific and Technical Information of China (English)

    程金玲

    2012-01-01

      目的:评价结核性脑膜炎患儿脑脊髓液中腺苷脱氨酶(CSF-ADA)活性对临床诊断意义及疗效判断价值.方法:选择122例住院患儿为研究对象,56例结核性脑膜炎患者为A组;66例非结核性脑膜炎患者为对照组,其中细菌性脑膜炎32例为B组,病毒性脑膜炎34例为C组,采用酶耦联Trinder法测定患儿治疗前CSF-ADA活性,56例结核性脑膜炎患儿于抗结核治疗后2周和6周时分别检测CSF-ADA.结果:A组CSF-ADA活性为(11.8±4.4)U/L,B组为(6.1±2.8)U/L,C组为(4.9±3.1)U/L,与A组比较差异有统计学意义(F=45.150, P=0.000).取CSF-ADA≥8 U/L作为临界值时鉴别结核性脑膜炎与非结核性脑膜炎价值最高,灵敏度为87.72%,特异度为90.77%.随着患儿病情好转,CSF-ADA活性逐渐降低.结论:CSF-ADA活性≥8U/L可作为诊断结核性脑膜炎的一项辅助诊断指标,抗结核治疗后CSF-ADA活性可作为疗效判断的参考指标.%  Objective: Evaluation of tuberculous meningitis with cerebrospinal fluid of adenosine deaminase(CSF-ADA)activity to clinical diagnosis significance and effect of value judgment. Method: To choose 122 cases hospitalized children as the research object,56 cases of tuberculous meningitis was the case group(group A). 66 cases of meningitis of n/med tuberculosis sex as control group,including bacterial meningitis 32 cases(group B),and viral meningitis 34 cases(C group),using enzyme coupling Trinder spectrometry to analyze CSF-ADA activity before treatment. 56 cases of tuberculous meningitis in antitubercular treatment children after 2 weeks and six weeks respectively detection CSF-ADA. Result:The CSF-ADA activity of group A was(11.8±4.4)U/L,compared with group B(6.1±2.8)U/L,group C(4.9±3.1)U/L,there was a significant difference meaning(F=45.150,P=0.000). Taking the CSF-ADA ≥ 8 U/L as critical value in identification of tuberculous meningitis had the highest value,and sensitivity was 87.72% and specificity was 90

  16. 脑脊液腺苷脱氨酶检测在结核性脑膜炎诊断中的应用研究%Application research of Cerebrospinal fluid adenosine deaminase in tuberculous meningitis diagnosis

    Institute of Scientific and Technical Information of China (English)

    牛俊梅; 张冬杰

    2012-01-01

    OBJECTIVE To discuss application value of cerebrospinal fluid adenosine deaminase (CSF-ADA) for tuberculous meningitis diagnosis. METHODS We retrospectively summarized 80 cases who were diagnosed as tuberculus meningitis in our department from 2005-2010. At the same time, 76 cases with other nervous system diseases were selected in same period in our hospital. CSF-ADA of the two groups were compared and analyzed at the time of 7 days, 14 days, 21 days, 30 days and recovery after 3 months, while CSF-ADA of 5 patients with simply pulmonary tuberculosis were also compared with patients with tuberculous meningitis. (P < 0.05 for statistical significance). RESULTS 7 days after the onset, CSF-ADA levels reached the peak, and then began to decline at the time of 14 days. With the treatment progress and course of development, the CSF-ADA level began to decrease. There were statistically significant difference (P < 0.05) of ADA level in each time points, and also showed significant difference between the two groups (P < 0.05). CONCLUSION CSF-ADA have high accuracy, sensitivity and specificity as an diagnosis index for tuberculous meningitis.%目的 探讨脑脊液腺苷脱氨酶检测在结核性脑膜炎诊断中的应用价值.方法 回顾性总结2005年6月~2010年6月间,某科收治的明确诊断为结核性脑膜炎的病例80例,同时选择同期在该科住院的非结脑性病人76例,对两组患者发病7d、14 d、21 d、30 d及恢复后3个月脑脊液ADA水平进行比较分析,同时与单纯肺结核患者进行比较分析,应用卡方检验,以P<0.05为差异有统计学意义.结果 结核性脑膜炎组,发病后7d左右,脑脊液ADA水平达到峰值,14 d左右即开始下降,随着治疗的进展及病程的发展,脑脊液ADA水平整体成下降趋势.各个时间点之间的ADA水平差异有统计学意义(P<0.05),与对照组患者ADA水平亦差异有统计学意义(P<0.05).结论 脑脊液ADA水平作为结核性脑膜炎诊断指

  17. The inclusion of ADA-SCID in expanded newborn screening by tandem mass spectrometry.

    Science.gov (United States)

    la Marca, Giancarlo; Giocaliere, Elisa; Malvagia, Sabrina; Funghini, Silvia; Ombrone, Daniela; Della Bona, Maria Luisa; Canessa, Clementina; Lippi, Francesca; Romano, Francesca; Guerrini, Renzo; Resti, Massimo; Azzari, Chiara

    2014-01-01

    Severe combined immunodeficiency due to adenosine-deaminase defect (ADA-SCID) is usually deadly in childhood because of severe recurrent infections. When clinical diagnosis is done, permanent damages due to infections or metabolite accumulation are often present. Gene therapy, bone marrow transplantation or enzyme replacement therapy may be effective if started early. The aim of this study was to set-up a robust method suitable for screening with a minimized preparation process and with inexpensive running costs, for diagnosing ADA-SCID by tandem mass spectrometry. ADA-SCID satisfies all the criteria for inclusion in a newborn screening program. We describe a protocol revised to incorporate adenosine and 2-deoxyadenosine testing into an expanded newborn screening program. We assessed the effectiveness of this approach testing dried blood spots from 4 genetically confirmed early-onset and 5 delayed-onset ADA-SCID patients. Reference values were established on 50,000 healthy newborns (deoxyadenosine <0.09μmol/L, adenosine <1.61μmol/L). We also developed a second tier test to distinguish true positives from false positives and improve the positive predictive value of an initial abnormal result. In the first 18 months, the pilot project has identified a newborn with a genetically confirmed defect in adenosine deaminase (ADA) gene. The results show that the method having great simplicity, low cost and low process preparations can be fully applicable to a mass screening program.

  18. Pegademase bovine (PEG-ADA for the treatment of infants and children with severe combined immunodeficiency (SCID

    Directory of Open Access Journals (Sweden)

    Claire Booth

    2009-06-01

    Full Text Available Claire Booth1,2, H Bobby Gaspar1,21Centre for Immunodeficiency, Molecular Immunology Unit, UCL Institute of Child Health, London, UK; 2Dept of Clinical Immunology, Great Ormond Street Hospital NHS Trust, London, UKAbstract: Adenosine deaminase deficiency (ADA is a rare, inherited disorder of purine metabolism characterized by immunodeficiency, failure to thrive and metabolic abnormalities. A lack of the enzyme ADA allows accumulation of toxic metabolites causing defects of both cell mediated and humoral immunity leading to ADA severe combined immune deficiency (SCID, a condition that can be fatal in early infancy if left untreated. Hematopoietic stem cell transplant is curative but is dependent on a good donor match. Other therapeutic options include enzyme replacement therapy (ERT with pegademase bovine (PEG-ADA and more recently gene therapy. PEG-ADA has been used in over 150 patients worldwide and has allowed stabilization of patients awaiting more definitive treatment with hematopoietic stem cell transplant. It affords both metabolic detoxification and protective immune function with patients remaining clinically well, but immune reconstitution is often suboptimal and may not be long lived. We discuss the pharmacokinetics, immune reconstitution, effects on systemic disease and side effects of treatment with PEG-ADA. We also review the long-term outcome of patients receiving ERT and discuss the role of PEG-ADA in the management of infants and children with ADA-SCID, alongside other therapeutic options.Keywords: adenosine deaminase deficiency, PEG-ADA, enzyme replacement therapy, severe combined immune deficiency (SCID

  19. Molecular characterization of adenosine 5'-monophosphate deaminase--the key enzyme responsible for the umami taste of nori (Porphyra yezoensis Ueda, Rhodophyta).

    Science.gov (United States)

    Minami, Seiko; Sato, Minoru; Shiraiwa, Yoshihiro; Iwamoto, Koji

    2011-12-01

    The enzyme adenosine 5'-monophosphate deaminase (AMPD, EC 3.5.4.6) catalyzes the conversion of adenosine 5'-monophosphate to inosine 5'-mononucleotide (IMP). IMP is generally known as the compound responsible for the umami taste of the edible red alga Porphyra yezoensis Ueda that is known in Japan as nori. Therefore, we suspect that AMPD plays a key role in providing a favorable nori taste. In this study, we undertake the molecular characterization of nori-derived AMPD. The nori AMPD protein has a molecular mass of 55 kDa as estimated from both gel filtration and sodium dodecyl sulfate polyacrylamide gel electrophoresis. The calculated molecular mass from the amino acid sequence deduced from cDNA is 57.1 kDa. The isoelectric point is 5.71. The coding region of AMPD consists of 1,566 bp encoding 522 amino acids and possesses a transmembrane domain and two N-glycosylation sites. The sequence identity of nori AMPD in human and yeast AMPDs was found to be less than 50% and 20% in DNA and amino acid sequences, respectively. Proline in the conserved motif of [SA]-[LIVM]-[NGS]-[STA]-D-D-P was found to be converted to glutamate. These results indicate that nori AMPD is a novel type of AMPD.

  20. Diagnostic Role of Adenosine Deaminase for Tuberculous Pericarditis:A Meta-analysis%腺苷脱氨酶对结核性心包炎诊断价值的Meta分析

    Institute of Scientific and Technical Information of China (English)

    余华香; 刘云芳; 向雪莉

    2013-01-01

    Objective:To investigate the overall diagnostic role of adenosine deaminase(ADA)measurement for tuberculous pericarditis. Method:A systematic literature search was conducted in Pubmed,Embase,China National Knowledge Infrastructure databases,VIP Information, and WanFang Data to identify studies on evaluation of ADA in the diagnosis of tuberculous pericarditis.The methodological quality of included studies was evaluated by QUADAS tool. Data were retrieved and analyzed by using Meta-Disc 1.4 software. Sensitivity,specificity,and other measures of the accuracy of ADA in the diagnosis of tuberculous pericarditis were pooled. Summary receiver operating characteristic(SROC)curve was used to summarize the overall test performance. Result:Eight studies involving 716 subjects were included in the present meta-analysis. The summary estimates for ADA measurement in the diagnosis of tuberculous pericarditis were:sensitivity 0.88,specificity 0.87,positive likelihood ratio 5.94,negative likelihood ratio 0.13,diagnostic odds ratio 41.43,and the area under the SROC curve was 0.91. Conclusion:ADA measurement plays a valuable role in the diagnosis of tuberculous pericarditis.%目的:评估腺苷脱氨酶(ADA)对结核性心包炎的诊断价值。方法:检索Pubmed、Embase、CNKI、维普、万方等数据库,查找利用检测心包积液中ADA诊断结核性心包炎的文献。QUADAS工具评价纳入文献的质量。提取数据并利用Meta-Disc 1.4软件合并数据,计算纳入研究的合并敏感性、特异性等指标,绘制汇总受试者工作特征(SROC)曲线,综合评价ADA对结核性心包炎的诊断价值。结果:共有8篇文献共计716例研究对象纳入本次研究,meta分析显示ADA对结核性心包炎的合并诊断价值分别为:敏感度为0.88,特异度为0.87,阳性似然比为5.94,阴性似然比为0.13,诊断优势比为41.43。SROC曲线下面积为0.91。结论:检测心包积液中ADA对结核性心包

  1. Value of adenosine deaminase activity to diagnosing tuberculous pleural effusion and malignant effusion%腺苷脱氨酶诊断结核性和恶性胸腔积液价值

    Institute of Scientific and Technical Information of China (English)

    唐学义; 林香花; 朱敏

    2011-01-01

    Objective To investigate the clinical value of pleural effusion adenosine deaminase activity to differentiating tuberculous pleural effusion from malignant effusion.Methods A total of 80 inpatients with pleural effusion received thoracoscopy and biopsy of pleura and were diagnosed tuberculous pleuritis (42 cases) and malignant pleural effusion (38 cases).The pleural effusion and adenosine deaminase activity were detected in these two groups.The optimal cutoff for tuberculous pleural effusion was determined with the ROC curve.Results The pleural effusion adenosine deaminase activity and the ratio of pleural fluid to serum adenosine deaminase were (48±25)u/L and 4.2±3.0 in tuberculous pleural effusion patients, significantly higher than those in malignant pleural effusion patients (20±9)u/L and 1.7±1.0 respectively( P<0.01).The serum adenosine deaminase activities were (15±6)u/L and (12±5)u/L in tuberculous pleuritis patients and malignant pleural effusion,which showed no significant difference(P>0.05).The cutoff value of pleural adenosine deaminase determined with ROC curve was 30.7 u/L, the sensitivity was 70.5% and the specificity was 92.2%.Conclusion The pleural effusion adenosine deaminase activity but not the serum adenosine deaminase activity can be used to differentiate tuberculous from malignant pleural effusion.%目的:探讨胸腔积液和血清中腺苷脱氨酶鉴别诊断结核性胸膜炎及恶性胸腔积液的价值.方法:因胸腔积液住院,经胸腔镜检查和胸膜活检病理确诊为结核性胸腹炎患者(结核组)42例和恶性胸腔积液患者(恶性组)38例,分别检测2组胸腔积液及血清中腺苷脱氨酶活性,应用ROC曲线确定结核性胸膜炎患者胸腔积液腺苷脱氨酶的最佳临界值.结果:结核组胸腔积液腺苷脱氨酶活性、胸腔积液腺苷脱氨酶与血清腺苷脱氨酶比值分别为(48±25)u/L和4.2±3.0,高于恶性组的(20±9)u/L和1.7±1.0.差异均有统计学意义(P<0

  2. Observation on the activities of alpha-L-fucosidase,alkaline phosphatase and adenosine deaminase in pregnant women%妊娠女性α-L-岩藻糖苷酶、碱性磷酸酶和腺苷脱氨酶活性观察

    Institute of Scientific and Technical Information of China (English)

    王玮玮; 孙伟才; 周惠玉

    2014-01-01

    目的:妊娠期女性观察血清α-L-岩藻糖苷酶(AFU)、碱性磷酸酶(ALP)及腺苷脱氨酶(ADA)活性的变化及其与妊娠周期的相关性。方法分别检测352例体检正常的不同妊娠期女性(妊娠组,其中早期妊娠210例、晚期妊娠142例)及322例因不孕就诊且尚未妊娠的体检正常的女性(非妊娠组)血清 AFU、ALP、ADA 活性。对所有对象均进行动态监测(早期妊娠组于妊娠第14、22、30及38周分别检测,晚期妊娠组于妊娠第38及40周检测,非妊娠组于就诊时、就诊后第8及24周检测)并做比较。结果妊娠组血清 ALP、AFU 活性明显高于非妊娠组(P =0.000),ADA 活性则低于非妊娠组(P =0.000)。晚期妊娠组血清 ALP、AFU 活性明显高于早期妊娠组(P =0.000),但 ADA 活性两组间差异无统计学意义(P >0.05)。对早期妊娠组的动态监测显示,随着妊娠周期的增加,AFU 及 ALP 活性逐渐升高,但 ADA 基本无变化。晚期妊娠组第38周及第40周血清 AFU、ALP、ADA 活性差异均无统计学意义(P >0.05)。对非妊娠组的动态监测显示,与就诊时比较,就诊后第8周 ALP、ADA 活性差异有统计学意义(P =0.000),就诊后第24周 ADA 活性差异有统计学意义;与就诊后第8周比较,就诊后第24周 ALP、AFU、ADA 活性差异均有统计学意义(P <0.05)。结论妊娠期女性血清 AFU 及 ALP 活性明显升高,且随孕周的增加,升高趋势越明显。%Objective To observe the activity changes of alpha-L-fucosidase (AFU),alkaline phosphatase (ALP) and adenosine deaminase (ADA)in pregnant women and their correlations with pregnant period.Methods The activities of AFU,ALP and ADA were determined in 352 pregnant women (210 cases with early-stage pregnancy and 142 cases with late-stage pregnancy)and 322 unpregnant women.Dynamic monitoring was performed (early-stage pregnancy

  3. Diagnostic Value of Adenosine Deaminase and Tuberculosis Antibody Detection in Diabetes Complicated with Pulmonary Tuberculosis%腺苷脱氨酶及结核抗体在糖尿病合并肺结核诊断中的价值

    Institute of Scientific and Technical Information of China (English)

    夏家安; 陈兆辉; 吴美容; 陈华

    2011-01-01

    目的 评价腺苷脱氨酶和结核抗体检测用于辅助诊断糖尿病合并肺结核的价值.方法 对116例糖尿病合并肺结核患者、133例糖尿病合并非结核肺部感染患者以及120例健康人群的血清腺苷脱氨酶(ADA)、结核抗体(TB-Ab)进行检测并分析.结果 糖尿病合并肺结核患者血清ADA水平(22.7±7.3 u/L)和阳性率(70.3%)明显高于其它两组,均有显著性差异(P<0.01).糖尿病合并肺结核患者TB-Ab阳性率(71.5%)较糖尿病合并非结核肺部感染患者(8.5%)和健康人群对照组(7.5%)有显著性差异(P<0.01).结论 ADA和TB-Ab联合检测对于辅助诊断糖尿病合并肺结核特别是结核症状不典型的病例有一定价值.%Object To Evaluate value of adenosine deaminase (ADA) and tuberculosis antibody (TB-Ab) detection in diagnosis of diabetes complicated with pulmonary tuberculosis. Methods Serum ADA, TB-Ab were detected among 116 patients with diabetes complicated with pulmonary tuberculosis, 133 patients with diabetes without tuberculosis pneumonia and 120 health control. Results ADA level( 10. 7 ± 3.3u/L) and positive ratio (20. 3% ) in diabetes without tuberculosis l pneumonia is higher (P < 0. 05 ) than normal controls (5.2 ± i. 6u/L and 1.7% ), and even higher (P <0. 01 ) in diabetes complicated with pulmonary tuberculosis (22. 7 ±7. 3u/L and 70. 3% ). They are significantly differ from each other. TB-Ab positive ratio in diabetes complicated with pulmonary tuberculosis (71.5%) is significant higher (P <0. 01 ) than individual without tuberculosis (7. 5% in normal control and 8. 5% in diabetes). And Serum ADA, TB-Ab both detected positive among patients with diabetes complicated with pulmonary tuberculosis, ADA level is 25.95 ± 10. 9 u/L. Conclusion Simultaneous detection of ADA and TB-Ab is valuable for diagnosis of diabetes complicated with tuberculosis, especially those with no classic tuberculosis.

  4. Successful reconstitution of immunity in ADA-SCID by stem cell gene therapy following cessation of PEG-ADA and use of mild preconditioning.

    Science.gov (United States)

    Gaspar, H Bobby; Bjorkegren, Emma; Parsley, Kate; Gilmour, Kimberly C; King, Doug; Sinclair, Joanna; Zhang, Fang; Giannakopoulos, Aris; Adams, Stuart; Fairbanks, Lynette D; Gaspar, Jane; Henderson, Lesley; Xu-Bayford, Jin Hua; Davies, E Graham; Veys, Paul A; Kinnon, Christine; Thrasher, Adrian J

    2006-10-01

    Gene therapy is a promising treatment option for monogenic diseases, but success has been seen in only a handful of studies thus far. We now document successful reconstitution of immune function in a child with the adenosine deaminase (ADA)-deficient form of severe combined immunodeficiency (SCID) following hematopoietic stem cell (HSC) gene therapy. An ADA-SCID child who showed a poor response to PEG-ADA enzyme replacement was enrolled into the clinical study. Following cessation of enzyme replacement therapy, autologous CD34(+) HSCs were transduced with an ADA-expressing gammaretroviral vector. Gene-modified cells were reinfused following one dose of preconditioning chemotherapy. Two years after the procedure, immunological and biochemical correction has been maintained with progressive increase in lymphocyte numbers, reinitiation of thymopoiesis, and systemic detoxification of ADA metabolites. Sustained vector marking with detection of polyclonal vector integration sites in multiple cell lineages and detection of ADA activity in red blood cells suggests transduction of early hematopoietic progenitors. No serious side effects were seen either as a result of the conditioning procedure or due to retroviral insertion. Gene therapy is an effective treatment option for the treatment of ADA-SCID.

  5. Adenosine deaminase deficiency associated severe combined immunodeficiency with disseminated varicella infection after vaccination: a case report%腺苷脱氨酶缺陷重症联合免疫缺陷伴疫苗接种后播散性水痘感染一例

    Institute of Scientific and Technical Information of China (English)

    张维溪; 赵伟

    2008-01-01

    Objective To enhance the knowledge of adenosine deaminase (ADA) deficiency associated severe combined immunodeficiency (SCID) with disseminated varicella infection after vaccination.Methods With case report and review of literature,the background knowledge,clinical and laboratory findings,diagnosis and treatment of ADA-deficient SCID were discussed.Results The patient had the condition with failure to thrive.The main complaint was more than three weeks of fever and rash.He had received the live attenuated Oka strain varicella vaccination approximately two weeks before the onset of rash.Varicella infection was confirmed with direct immunofluorescence assay. The patient had mild leukoponia,with 3% lymphocytes.The initial immunologic workup included decreased IgG,IgM and IgA,abnormal expanded lymphocyte enumeration which confirmed the reduction of CD3,CD4,CD8,CD19 and CD56.Enzyme testing for ADA activity showed remarkably low level in the hemolysate,as well as increased levels of deoxyadenosine nucleotides.Conclusion ADA-deficient SCID has some characteristic clinical and laboratory findings. Management options for ADA-deficient SCID include hematopoietic stem cell transplantation,enzyme replacement therapy and gene therapy.Immunodeficiency should be considered in children with severe failure-w-thrive. Live"vaccine administration should be avoided in patients with immunodeficiency.%目的 提高对腺苷脱氨酶(ADA)缺陷重症联合免疫缺陷(SCID)及疫苗接种后播散性水痘感染的认识.方法 结合1例ADA缺陷SCID伴疫苗接种后播散性水痘感染的临床资料和文献复习,探讨ADA缺陷SCID背景知识、临床表现、诊断和治疗.结果 患儿存在生长停滞情况,以发热、皮疹3周余入院,出皮疹前两周曾接种水痘疫苗,水痘直接免疫荧光试验阳性,血液常规检查淋巴细胞比例和绝对值(105×106/L)明显降低,IgG(1520 ms/L)、IgM(250 mg/L)和IgA(102 ms/L)显著降低,淋巴细胞亚群CD3、CD4

  6. Hydroxycarbamide modulates components involved in the regulation of adenosine levels in blood cells from sickle-cell anemia patients.

    Science.gov (United States)

    Silva-Pinto, Ana C; Dias-Carlos, Carolina; Saldanha-Araujo, Felipe; Ferreira, Flávia I S; Palma, Patrícia V B; Araujo, Amélia G; Queiroz, Regina H C; Elion, Jacques; Covas, Dimas T; Zago, Marco A; Panepucci, Rodrigo A

    2014-09-01

    Recent studies have demonstrated the role of adenosine (ADO) in sickle-cell anemia (SCA). ADO is produced by CD39 and CD73 and converted to inosine by adenosine deaminase (ADA). We evaluated the effects of hydroxycarbamide (HU) treatment on the modulation of adenosine levels in SCA patients. The expressions of CD39, CD73, and CD26 were evaluated by flow cytometry on blood cells in 15 HU-treated and 17 untreated patients and 10 healthy individuals. RNA was extracted from monocytes, and ADA gene expression was quantified by real-time PCR. ADA activity was also evaluated. We found that ADA transcripts were two times higher in monocytes of HU-treated patients, compared with untreated (P = 0.039). Monocytes of HU-treated patients expressed CD26, while monocytes of controls and untreated patients did not (P = 0.023). In treated patients, a lower percentage of T lymphocytes expressed CD39 compared with untreated (P = 0.003), and the percentage of T regulatory (Treg) cells was reduced in the treated group compared with untreated (P = 0.017) and controls (P = 0.0009). Besides, HU-treated patients displayed increased ADA activity, compared with untreated. Our results indicate a novel mechanism of action of HU mediated by the reduction of adenosine levels and its effects on pathophysiological processes in SCA.

  7. Significance of serum adenosine deaminase and liver fibrosis associated biomarkers in patients with hepatitis B%乙型肝炎患者血清腺苷酸脱氨酶与肝纤维化血清标志物测定的意义

    Institute of Scientific and Technical Information of China (English)

    蔡坤; 王福利

    2014-01-01

    目的:探讨乙型肝炎患者血清腺苷酸脱氨酶( ADA)与肝纤维化血清标志物透明质酸( HA)、层黏蛋白( LN)、IV型胶原( C IV)及Ⅲ型前胶原( PC Ⅲ)检测的意义。方法:选择2011年8月至2012年12月海南省人民医院收治的30例乙型肝炎住院患者作为观察组,同期38例健康体检者为正常对照组,分别检测两组血清ADA活性,HA、LN、C 1V、PC Ⅲ水平。结果:观察组患者血清ADA活性,HA、LN、C IV、PC Ⅲ水平明显高于正常对照组,两组比较,差异有统计学意义( P<0.01)。结论:测定乙型肝炎患者血清ADA的活性与HA、LN、C IV、PCⅢ水平的变化,既能了解乙型肝炎患者肝脏损伤程度,又能反映肝纤维化趋势,对乙型肝炎患者肝纤维化早期进行诊断、治疗,减少肝硬化的发生及预后判断有着重要的临床意义。%Objective:To investigate the clinical significance of serum adenosine deaminase ( ADA ) and liver fibrosis associated biomarkers, including hyaluronic acid ( HA) . Laminin ( LN) , type IV collagen ( C IV) and type Ⅲ pre collagen ( PC Ⅲ) in patients with hepatitis B. Methods: Between August 2011 and December 2012, we recruited 30 patients with hepatitis B ( observation group) and 38 healthy subjects ( control group) who underwent health check up in Hainan People’ s Hospital. The levels of serum ADA, HA, LN, C 1V and PCⅢwere assayed. Results:The observation group yielded markedly higher levels of serum ADA activity, HA, LN, C IV and PC Ⅲ ( all P<0.01) compared with control group. Conclusion:The assay of serum ADA activity and changes in the levels of HA, LN, C IV and PC Ⅲ may help determine the magnitude of hepatic injury and the trends towards liver fibrosis in patients with hepatitis B. These measurements should be considered as worthwhile for early diagnosis and treatment of liver fibrosis in hepatitis B and may be associated with reduced incidence rate of liver cirrhosis and improved prognosis.

  8. Pegademase bovine (PEG-ADA) for the treatment of infants and children with severe combined immunodeficiency (SCID)

    Science.gov (United States)

    Booth, Claire; Gaspar, H Bobby

    2009-01-01

    Adenosine deaminase deficiency (ADA) is a rare, inherited disorder of purine metabolism characterized by immunodeficiency, failure to thrive and metabolic abnormalities. A lack of the enzyme ADA allows accumulation of toxic metabolites causing defects of both cell mediated and humoral immunity leading to ADA severe combined immune deficiency (SCID), a condition that can be fatal in early infancy if left untreated. Hematopoietic stem cell transplant is curative but is dependent on a good donor match. Other therapeutic options include enzyme replacement therapy (ERT) with pegademase bovine (PEG-ADA) and more recently gene therapy. PEG-ADA has been used in over 150 patients worldwide and has allowed stabilization of patients awaiting more definitive treatment with hematopoietic stem cell transplant. It affords both metabolic detoxification and protective immune function with patients remaining clinically well, but immune reconstitution is often suboptimal and may not be long lived. We discuss the pharmacokinetics, immune reconstitution, effects on systemic disease and side effects of treatment with PEG-ADA. We also review the long-term outcome of patients receiving ERT and discuss the role of PEG-ADA in the management of infants and children with ADA-SCID, alongside other therapeutic options. PMID:19707420

  9. The pleural effusion diagnosis value of adenosine deaminase detection%腺苷脱氨酶检测在胸腔积液诊断中的价值

    Institute of Scientific and Technical Information of China (English)

    潘桂红

    2009-01-01

    目的 分析腺苷脱氨酶(ADA)活性检测在胸腔积液诊断和鉴别诊断中的应用价值.方法 对86例自2007年~2008年我院经治有胸腔积液症状的患者检测胸腔积液和血清ADA水平并计算二者比值,对不同疾病组结果 分析比较.结果 结核性胸腔积液组ADA(42.34±11.22U/L)与恶性胸腔积液组ADA(7.62±1.95U/L)、其它胸腔积液组ADA(7.94±2.21U/L)比较差异有显著性(P0.05);胸腔积液ADA(PADA)/血清ADA(SADA)比值,结核性胸腔积液组(3.91±0.23)与恶性胸腔积液组(0.78±0.12)、其它胸腔积液组(0.80±0.13)相比差异有显著性(P<0.01);PADA及PADA/SADA比值判断结核性胸腔积液的临界值分别为:38U/L(敏感性94.2%、特异性95.1%)、1.0(敏感性96.1%、特异性97.4%).结论 胸腔积液腺苷脱氨酶测定对结核性胸腔积液的诊断具有重要价值.

  10. 脑脊液腺苷脱氨酶对结核性脑膜炎患者病情程度和疾病预后的预测价值%Predictive value of cerebrospinal fluid adenosine deaminase for degree of illness and disease prognosis of patients with tuberculous meningitis

    Institute of Scientific and Technical Information of China (English)

    吴素芳; 彭素珍; 郑淑芳; 黄镇丰

    2014-01-01

    目的:探讨脑脊液腺苷脱氨酶(ADA)对结核性脑膜炎患者病情程度和疾病预后的预测作用。方法选取135例脑膜炎患者,其中结核性脑膜炎(结核组)50例,病毒性脑膜炎(病毒组)45例,细菌性脑膜炎(细菌组)40例,同期选取50例健康体检者(对照组)。全部研究对象采用酶显色检测法检测ADA水平,并进行比较。结核组患者根据全身性炎症反应程度进行分组,分为未合并败血症组、合并轻度败血症组和合并重症败血症组,比较三组ADA水平,分析脑脊液ADA在结核性脑膜炎患者病情、预后评估中的价值。结果结核组脑脊液ADA水平明显高于病毒组、细菌组和对照组,组间比较差异有统计学意义(P<0.05),合并重症败血症组ADA水平明显高于未合并败血症组和合并轻度败血症组,组间比较差异有统计学意义(P<0.05),治疗后3、6、9周ADA水平显著低于入院时,差异有统计学意义(P<0.05),且预后不良组ADA水平明显高于预后良好组(P<0.05)。结论脑脊液ADA在结核性脑膜炎的诊断中具有重要的意义,在病情和疾病预后的预测方面具有可靠的价值。%Objective To investigate the predictive effect of cerebrospinal fluid (CSF) adenosine deaminase (ADA) for tubercular meningitis patients severity and prognosis of the disease. Methods 135 cases of meningitis were selected, and included 50 cases of tubercular meningitis (the tuberculosis group), 45 cases of viral meningitis (the virus group), 40 cases of bacterial meningitis (the bacterial group). 50 healthy subjects were selected as the control group in the same period. The ADA levels of all research objects were detected by enzyme color detection and were compared. TB patients grouped according to systemic inflammatory reaction degree, who were divided into the unincorporated sepsis groups, the mild sepsis group and the combining severe sepsis group, the ADA levels of the three

  11. Avaliação da adenosina desaminase no diagnóstico da tuberculose pleural: uma metanálise brasileira Evaluation of adenosine deaminase in the diagnosis of pleural tuberculosis: a Brazilian meta-analysis

    Directory of Open Access Journals (Sweden)

    Patrizio Morisson

    2008-04-01

    Full Text Available OBJETIVO: Avaliar trabalhos brasileiros resumindo a acurácia da adenosina desaminase no diagnóstico da tuberculose pleural, com o intuito de contribuir para a concretização do exame como rotina na investigação dos derrames pleurais. MÉTODOS: Depois de realizada uma busca por trabalhos brasileiros referentes à dosagem da adenosina desaminase no líquido pleural, estes foram avaliados e incluídos no estudo. A análise dos dados foi feita por meio da curva summary receiver operating characteristic (SROC que possibilitou a reunião dos estudos quanto a acurácia para o diagnóstico. Com os valores globais de sensibilidade e especificidade foi aplicado o teorema de Bayes para calcular as probabilidades pós-teste em diferentes prevalências da doença. RESULTADOS: Entre 1987 e 2005 foram encontrados 25 estudos contendo informações suficientes que poderiam ser utilizadas na metanálise. Após avaliação, foram incluídos nove estudos, totalizando 1.674 pacientes. De acordo com a curva SROC, foi encontrada uma sensibilidade de 91,8% (IC95%: 89,8-93,6% e uma especificidade de 88,4% (IC95%: 86,0-90,5%, com uma área abaixo da curva de 0,969. O odds ratio global foi de 112,0 (IC95%: 51,6-243,2. Considerando uma prevalência da tuberculose pleural de 50% (considerada neutra, a probabilidade do diagnóstico pós-teste positivo é de 88,7% e sua exclusão após resultado negativo de 91,5%. CONCLUSÕES: Apesar das diferenças encontradas entre os estudos, é possível concluir que a adenosina desaminase possui alta acurácia no diagnóstico da tuberculose pleural, devendo ser utilizada de rotina em sua investigação.OBJECTIVE: To evaluate Brazilian studies by summarizing the accuracy of adenosine deaminase in the diagnosis of pleural tuberculosis, with the objective of lending support to the movement to make the test part of the routine investigation of pleural effusions. METHODS: A search for Brazilian studies related to the determination of

  12. A novel mutation in the ADA gene causing severe combined immunodeficiency in an Arab patient: a case report

    Directory of Open Access Journals (Sweden)

    Hellani Ali

    2009-04-01

    Full Text Available Abstract Introduction About 20% of the cases of human severe combined immunodeficiency are the result of the child being homozygous for defective genes encoding the enzyme adenosine deaminase. To our knowledge, the mutation pattern in Arab patients with severe combined immunodeficiency has never been reported previously. Case presentation A 14-month-old Arab boy had clinical features typical of severe combined immunodeficiency. His clinical picture and flow cytometric analysis raised the diagnosis of adenosine deaminase deficiency and prompted us to screen the adenosine deaminase gene for mutation(s. We detected a novel mutation in exon 9 of the adenosine deaminase gene (p.Arg282>Gln, which we believe is the cause of the severe combined immunodeficiency phenotype observed in our patient. Conclusion This is the first report of adenosine deaminase mutation in an Arab patient with severe combined immunodeficiency due to a novel pathogenic mutation in the adenosine deaminase gene.

  13. Biochemical detection of E-ADA on Neospora caninum tachyzoites and the effects of a specific enzymatic inhibitor

    Directory of Open Access Journals (Sweden)

    Alexandre A. Tonin

    2015-01-01

    Full Text Available Objective. This study aimed to investigate the presence and activity of the ecto adenosine deaminase (E-ADA enzyme in tachyzoites of Neospora caninum (Nc-1 strain, as well as to assess the activity of a well-known E-ADA inhibitor, the deoxycoformycin. Materials and methods. The parasites were grown in cell culture, being subsequently separated in a pellet of tachyzoites, on which the E-ADA activity was tested using the concentrations 0 (control, 0.2, 0.4 and 0.8 mg mL-1. Results. The E-ADA showed high activity, progressively increasing its activity according to the enhancement of the protein concentration. The test was carried out with different concentrations of deoxycoformycin, showing that it was able to inhibit the E-ADA present on the free form of the parasite. Conclusions. Based on these results we conclude that the E-ADA is present on tachyzoites of N. caninum, and deoxycoformycin is able to inhibit this enzyme. In this sense, knowing the negative impact of N. caninum on reproductive issue in cattle (mainly abortion, might it is an alternative in order to deal with this parasitic infection.

  14. 脑脊液免疫球蛋白、乳酸脱氢酶及腺苷脱氨酶检测在成人颅内感染鉴别诊断中的临床意义%Clinical significance of immunoglobulins, lactatedehydrogenase ,and adenosine deaminase detection in differential diagnosis of intracranial infections in adults

    Institute of Scientific and Technical Information of China (English)

    张丽琴

    2012-01-01

    OBJECTIVE To investigate the changes of immunoglobulin (Ig), lactate dehydrogenase(LDH), and adenosine deaminase(ADA) in cerebrospinal fluid (CSF)of the adults with intracranial infections and explore the clinical significance.METHODS Totally 17 patients with tuberculous meningitis, 19 patients with purulent meningitis, and 21 patients with viral meningitis were recruited in this study.The levels of LDH, ADA, and Ig in CSF from.each patient were measured and compared with the control group.RESULTS The concentrations of LDH, ADA, IgM, IgG.and IgA in CSF of the patients with purulent meningitis were(85.60±18.11)U/L,(2.59 ±0.52)U/L,(63.85±13.44)mg/L,(92.55±35.18)mg/L,and (20.60±8.75)mg/L,respectively ; the levels of LDA, ADA, IgM, IgG, and IgA in CSF of the patients with tuberculous meningitis were(78.80±22.38)U/L, (11.83±2.65)U/L, (18.90±8.62)mg/L, (180.69±42.28)mg/L, and(41.63±ll.42)mg/L, respectively) the levels of LDA, ADA, IgM, IgG, and IgA in CSF of the patients with viral meningitis were(22.43±9.56)U/L, (2.66±0.64)U/L, (5.83±1.34)mg/L,(20.90±10.35)mg/L,and(7.20±2.30)mg/L, respectively; of the three groups of adults with intracranial infectious diseases, the levels of IgM, IgG, IgA, and LDH in CSF of the patients with tuberculous meningitis or purulent meningitis were significantly higher than those in the patients with viral meningitis(P<0.01), the levels of IgG and IgA in CSF of the patients with tuberculous meningitis increased most significantly, the level of IgM in CSF of the patients with purulent meningitis increased most significantly, the activity of ADA of the tuberculous meningitis group was significantly higher than control group and other two groups(P<0.01 ); no statistical significance was found when between the indexes of viral meningitis group and control group.CONCLUSION The blood brain barriers of adult patients have been injured in varying degreest the detection of Ig, LDH in CSF is helpful to clinical diagnosis and

  15. Clinical significance of detecting tumour necrosis factor-α, immtme globnlin and adenosine deaminase in cerebrospinal fluid of patients with intracranial infection%颅内感染性疾病脑脊液中肿瘤坏死因子-α、免疫球蛋白及腺苷脱氨酶检测的临床意义

    Institute of Scientific and Technical Information of China (English)

    王彦斌; 张新娜; 郭榕; 古颖春

    2008-01-01

    Objective To investigate the diversify and clinical significance of tumour necrosis factor-alpha (TNF-α), immune globulin (Ig), adenosine deaminase (ADA) in cercbrospinal fluid (CSF) of patients with intracranial infection. Method The levels of TNF-α,Ig and ADA in CSF of 25 cases of purulent meningitis ,30 eases of cerebral tuberculosis ,28 cases of virus meningitis and 24 cases of controls were detected by ELISA, immunity velocity scattering nepbelometry and enzyme coupling method respectively. Results The levels of IgA, IgM, IgG, ADA, TNF-α were (41.72±11.31) mg/L(18.11± 2.62)mg/L, (181.60±41.19)mg/L, (13.41±3.42)U/L, (418.62±43.16)ng/L in cerebral tuberculosis patients. The levels of IgA, IgM, IgG, ADA and TNF-αwere (20.65±8.85)mg/L, (93.20±4.30)mg/L, (92.77±35.09)mg/L, (3.32±2.41) U/L, (476.93±45.16) ng/L in purulent meningitis patients, and those were (7.11±2.23)rag/L,(5.81±1.19)mg/L,(20.71±10. 54)mg/L,(2. 36±0. 44)U/L,(375.06±45.21) ng/L in virus meningitis patients. The levels of IgM,IgG and IgA in cerebral tuberculosis patients and purulent meningitis patients were significantly higher than those in virus meningitis patients and controls (P< 0.01). The levels of IgG,IgA heightened most markedly in cerebral tuberculosis patients. The activity of ADA in cerebra] tuberculosis patients was higher markedly than that in controls and the other patients(P< 0.01). The levels of TNF-α in purulent meningitis patients were higher than those in controls and virus meningitis patients(P< 0.05). The levels of TNF-α in purulent meningitis patients were the highest, and the next was in cerebral tuberculosis patients. But there was no significant difference of each index between viral meningitis patients and controls. Conclusions Detecting the activity of ADA in CSF is the most valuable in diagnosing cerebral tuberculosis. Synchronized detection of TNF-α,Ig, ADA may be have better clinical application in diagnosing intracranial infection.%目的 探讨

  16. Adenosine receptor antagonists alter the stability of human epileptic GABAA receptors

    Science.gov (United States)

    Roseti, Cristina; Martinello, Katiuscia; Fucile, Sergio; Piccari, Vanessa; Mascia, Addolorata; Di Gennaro, Giancarlo; Quarato, Pier Paolo; Manfredi, Mario; Esposito, Vincenzo; Cantore, Gianpaolo; Arcella, Antonella; Simonato, Michele; Fredholm, Bertil B.; Limatola, Cristina; Miledi, Ricardo; Eusebi, Fabrizio

    2008-01-01

    We examined how the endogenous anticonvulsant adenosine might influence γ-aminobutyric acid type A (GABAA) receptor stability and which adenosine receptors (ARs) were involved. Upon repetitive activation (GABA 500 μM), GABAA receptors, microtransplanted into Xenopus oocytes from neurosurgically resected epileptic human nervous tissues, exhibited an obvious GABAA-current (IGABA) run-down, which was consistently and significantly reduced by treatment with the nonselective adenosine receptor antagonist CGS15943 (100 nM) or with adenosine deaminase (ADA) (1 units/ml), that inactivates adenosine. It was also found that selective antagonists of A2B (MRS1706, 10 nM) or A3 (MRS1334, 30 nM) receptors reduced IGABA run-down, whereas treatment with the specific A1 receptor antagonist DPCPX (10 nM) was ineffective. The selective A2A receptor antagonist SCH58261 (10 nM) reduced or potentiated IGABA run-down in ≈40% and ≈20% of tested oocytes, respectively. The ADA-resistant, AR agonist 2-chloroadenosine (2-CA) (10 μM) potentiated IGABA run-down but only in ≈20% of tested oocytes. CGS15943 administration again decreased IGABA run-down in patch-clamped neurons from either human or rat neocortex slices. IGABA run-down in pyramidal neurons was equivalent in A1 receptor-deficient and wt neurons but much larger in neurons from A2A receptor-deficient mice, indicating that, in mouse cortex, GABAA-receptor stability is tonically influenced by A2A but not by A1 receptors. IGABA run-down from wt mice was not affected by 2-CA, suggesting maximal ARs activity by endogenous adenosine. Our findings strongly suggest that cortical A2–A3 receptors alter the stability of GABAA receptors, which could offer therapeutic opportunities. PMID:18809912

  17. The correlation study of hydrothorax adenosine deaminase activity and age of patients with tuberculous pleuritis%结核性胸膜炎胸腔积液腺苷脱氨酶活性与年龄的相关性研究

    Institute of Scientific and Technical Information of China (English)

    邹兴武; 陈园园; 金春

    2015-01-01

    目的 研究结核性胸膜炎胸腔积液腺苷脱氨酶(adenosine deaminase,ADA)活性与年龄的相关性,为临床诊断提供参考.方法 选取2008年3月1日至2013年3年31日本院诊治的结核性胸膜炎患者248例为研究对象,按年龄段分组,分别测定各组患者胸腔积液ADA活性,分析其与年龄的相关性.结果 20~29岁、30~39岁、40~49岁、50~59岁、60~69岁、70~79岁、≥80岁组患者胸腔积液ADA活性分别为(64.0±18.4)、(62.0±19.0)、(59.0±17.6)、(50.0±14.5)、(52.8±14.0)、(39.1±12.0)、(41.9±32.8) U/L,年龄相差越大,胸腔积液ADA活性差别越大(F=24.381,P=0.000);≥50岁以上组患者的胸腔积液ADA活性与20~29岁组相比均具有显著差异(P< 0.05);年龄与胸腔积液ADA活性呈负相关(r=-0.942);胸腔积液ADA活性>45U/L为诊断结核性胸膜炎的临界值,20~29岁、30~39岁、40~49岁、50~59岁、60~69岁、70~79岁、≥80岁组的诊断灵敏度分别为91.59%、93.18%、90.63%、82.61%、66.67%、53.85和45.45%,组间差异显著(P<0.05).结论 结核性胸膜炎胸腔积液ADA活性与年龄呈负相关,年龄是ADA活性的影响因素之一,对不同年龄段的患者选取不同的ADA临界值来诊断结核胸膜炎可降低漏诊率和误诊率.

  18. Genetics Home Reference: adenosine deaminase deficiency

    Science.gov (United States)

    ... disorder that damages the immune system and causes severe combined immunodeficiency (SCID). People with SCID lack virtually all immune ... Management Formal Diagnostic Criteria (1 link) ACT Sheet: Severe Combined Immunodeficiency (SCID) and Conditions Associated with T Cell Lymphoneia ( ...

  19. Genetics Home Reference: adenosine deaminase 2 deficiency

    Science.gov (United States)

    ... Zeligson S, Marek-Yagel D, Strom TM, Shohat M, Singer A, Rubinow A, Pras E, Winkelmann J, Tekin ... Punaro M, Pascual V, Verbsky JW, Torgerson TR, Singer NG, Gershon TR, Ozen S, Karadag O, Fleisher TA, ...

  20. Diagnostic value of combined detection of serum ADA,TBA and AFU in liver diseases%血清ADA、TBA和AFU联合检测在肝脏疾病临床诊疗中的价值

    Institute of Scientific and Technical Information of China (English)

    徐万清; 龚扬彬; 肖毅; 熊杰

    2011-01-01

    目的:探讨血清腺苷脱氨酶(Adenosine deaminase,ADA)、总胆汁酸(Total bilious acid,TBA)和α-L-岩藻糖苷酶(α-L-Fucosidase,AFU)联合检测对肝脏疾病的诊断价值.方法:分别测定急性肝炎组、慢性活动性肝炎组、慢性迁延性肝炎组、肝硬化组、肝癌组及健康对照组血清ADA、TBA、AFU、丙氨酸氨基转移酶(ALT)及γ-谷氨酰转移酶(γ-GT).结果:相对于健康对照组,ADA和TBA在各型肝炎及肝硬化中均有不同程度的升高,而肝癌患者的AFU明显升高,ADA和TBA无明显升高.结论:联合检测血清ADA、TBA和AFU在肝脏疾病的诊断和鉴别诊断中具有更高价值.%Objective: To investigate the diagnostic value of combined detection of serum Adenosine deaminase (ADA) , Total bilious acid (TBA) and a - L - Fucosidase (AFU) in patients suffering from liver diseases. Methods; Serum ADA,TBA,AFU and ALT, γ - GT among actute hepatitis group, chronic active hepatitis group, chronic persistent hepatitis group, cirrhosis group, hepatic cancer and healthy contrast group were determined respectively. Results; Compared with healthy contrast group, ADA and TBA increased differently in actute hepatitis group, chronic active hepatitis group, chronic persistent hepatitis group and cirrhosis group. AFU improved significantly in the patients with hepatic cancer, but the results of ADA and TBA were similar to those of healthy controls. Conclusion; The associated tests of AD A, TBA and AFU are helpful to improve the diagnosis and differential diagnosis of liver diseases.

  1. Investigation on the diagnosis significance of C reactive protein and adenosine deaminase in cerebrospinal fluid among children with meningitis%脑脊液C反应蛋白和腺苷脱氨酶检测在小儿脑膜炎中的诊断价值探讨

    Institute of Scientific and Technical Information of China (English)

    徐仁荣; 张慧华; 朱华丽

    2015-01-01

    Objective To determine C reactive protein and adenosine deaminase in cerebrospinal fluid,and to investigate the clinical diagnosis significance for tuberculosis meningitis,purulent meningitis and viral meningitis. Methods A total of 31 5 children with meningitis (1 02 cases of tuberculosis meningitis,1 08 cases of purulent meningitis and 1 05 cases of viral meningitis)were enrolled,96 children undergoing operation without meningitis were enrolled as control group,and their cerebrospinal fluid samples were collected.The levels of C reactive protein and adenosine deaminase were determined,and the results were compared.Results C reactive protein and adenosine deaminase in control and viral meningitis groups were significantly lower than those in tuberculosis and purulent meningitis groups (P 0.05 ).C reactive protein in purulent meningitis group was higher than that in tuberculosis meningitis group(P <0.05 ),and adenosine deaminase was lower than that in tuberculosis meningitis group (P <0.05).C reactive protein in purulent meningitis group was positive,and the positive rate was 1 00%.There were 63 positive cases in tuberculosis meningitis group,and the positive rate was 61 .76%.That in viral meningtis was negative.Conclusions In cerebrospinal fluid,C reactive protein and adenosine deaminase determinations have important reference significance for the differential diagnosis of bacterial meningitis (purulent meningitis and tuberculosis meningitis)and viral meningitis.Adenosine deaminase may be a good indicator for the diagnosis of tuberculosis meningitis,in order to provide the reference for the early diagnosis of various types of meningitis.%目的:探讨小儿脑脊液C反应蛋白和腺苷脱氨酶在结核性脑膜炎、化脓性脑膜炎和病毒性脑膜炎早期诊断中的临床意义。方法分别检测315例小儿脑膜炎患儿(包括结核性脑膜炎102例、化脓性脑膜炎108例、病毒性脑膜炎105例)及96例非脑膜炎外科手术

  2. Ada COCOMO and the Ada Process Model

    Science.gov (United States)

    1989-01-01

    language, the use of incremental development, and the use of the Ada process model capitalizing on the strengths of Ada to improve the efficiency of software...development. This paper presents the portions of the revised Ada COCOMO dealing with the effects of Ada and the Ada process model . The remainder of...this section of the paper discusses the objectives of Ada COCOMO. Section 2 describes the Ada Process Model and its overall effects on software

  3. IL-3 or IL-7 increases ex vivo gene transfer efficiency in ADA-SCID BM CD34+ cells while maintaining in vivo lymphoid potential.

    Science.gov (United States)

    Ficara, Francesca; Superchi, Daniela B; Hernández, Raisa Jofra; Mocchetti, Cristina; Carballido-Perrig, Nicole; Andolfi, Grazia; Deola, Sara; Colombo, Augusto; Bordignon, Claudio; Carballido, José M; Roncarolo, Maria Grazia; Aiuti, Alessandro

    2004-12-01

    To improve maintenance and gene transfer of human lymphoid progenitors for clinical use in gene therapy of adenosine deaminase (ADA)-deficient SCID we investigated several gene transfer protocols using various stem cell-enriched sources. The lymphoid differentiation potential was measured by an in vitro clonal assay for B/NK cells and in the in vivo SCID-hu mouse model. Ex vivo culture with the cytokines TPO, FLT3-ligand, and SCF (T/F/S) plus IL-3 or IL-7 substantially increased the yield of transduced bone marrow (BM) CD34(+) cells purified from ADA-SCID patients or healthy donors, compared to T/F/S alone. Moreover, the use of IL-3 or IL-7 significantly improved the maintenance of in vitro B cell progenitors from ADA-SCID BM cells and allowed the efficient transduction of B and NK cell progenitors. Under these optimized conditions transduced CD34(+) cells were efficiently engrafted into SCID-hu mice and gave rise to B and T cell progeny, demonstrating the maintenance of in vivo lymphoid reconstitution capacity. The protocol based on the T/F/S + IL-3 combination was included in a gene therapy clinical trial for ADA-SCID, resulting in long-term engraftment of stem/progenitor cells. Remarkably, gene-corrected BM CD34(+) cells obtained from one patient 4 and 11 months after gene therapy were capable of repopulating the lymphoid compartment of SCID-hu hosts.

  4. Prolonged pancytopenia in a gene therapy patient with ADA-deficient SCID and trisomy 8 mosaicism: a case report.

    Science.gov (United States)

    Engel, Barbara C; Podsakoff, Greg M; Ireland, Joanna L; Smogorzewska, E Monika; Carbonaro, Denise A; Wilson, Kathy; Shah, Ami; Kapoor, Neena; Sweeney, Mirna; Borchert, Mark; Crooks, Gay M; Weinberg, Kenneth I; Parkman, Robertson; Rosenblatt, Howard M; Wu, Shi-Qi; Hershfield, Michael S; Candotti, Fabio; Kohn, Donald B

    2007-01-15

    A patient with adenosine deaminase-deficient severe combined immune deficiency (ADA-SCID) was enrolled in a study of retroviral-mediated ADA gene transfer to bone marrow hematopoietic stem cells. After the discontinuation of ADA enzyme replacement, busulfan (75 mg/m2) was administered for bone marrow cytoreduction, followed by infusion of autologous, gene-modified CD34+ cells. The expected myelosuppression developed after busulfan but then persisted, necessitating the administration of untransduced autologous bone marrow back-up at day 40. Because of sustained pancytopenia and negligible gene marking, diagnostic bone marrow biopsy and aspirate were performed at day 88. Analyses revealed hypocellular marrow and, unexpectedly, evidence of trisomy 8 in 21.6% of cells. Trisomy 8 mosaicism (T8M) was subsequently diagnosed by retrospective analysis of a pretreatment marrow sample that might have caused the lack of hematopoietic reconstitution. The confounding effects of this preexisting marrow cytogenetic abnormality on the response to gene transfer highlights another challenge of gene therapy with the use of autologous hematopoietic stem cells.

  5. The Clinical Value of Adenosine Deaminase in the Diagnosis of Tuberculous Pleurisy%腺苷脱氨酶在诊断结核性胸膜炎中的临床价值

    Institute of Scientific and Technical Information of China (English)

    江秀慧; 张全海; 张信鸽; 杨玉前

    2014-01-01

    Objective To study the relationship between theADA rising in pleural effusion and tuberculous pleuritis, so as to prefer early chemotherapy. Methods 336 cases with pleural effusion were tested with PPD and ADA activity was determined by enzyme kinetic analytical method respectively at the same time. Hydrothorax ADA for diagnosis in patients with tubeiculous pleurisy. Results Statistical analysis suggest significant differences of sensitivity and specificity between ADA and PPD (P<0.05). the former sensitivity was higher (94.04%) and specificity (88.8%) than that of the later (90.18%), (82.1%). Conclusion ADA test has active value in early for tuberculous pleural effusion and its chemotherapy.%目的:探讨胸腔积液中腺苷脱氨酶(ADA)测定值对结核性胸膜炎的诊断意义和应用价值。方法366例住院的胸腔积液患者,分别行结核菌素纯蛋白衍生物(PPD)试验,同时应用酶速率法检测胸腔积液中ADA值及其与血清中ADA比值,比较其特异性及灵敏度。结果 ADA>45 U/L对诊断结核性胸膜炎的敏感度(94.04%)、特异度(88.8%)均较高,高于PPD敏感度(90.18%)、特异度(82.1%),二者差异有显著性(P<0.05)。结论胸腔积液中ADA含量的检测对于早期诊断及治疗结核性胸膜炎具有积极意义。

  6. 腺苷脱氨酶检测对鉴别结核性胸腔积液的意义%A study on detecting adenosine deaminase for differential diagnosis of tuberculous pleuritis

    Institute of Scientific and Technical Information of China (English)

    杨建鑫; 郑宇琼; 陈淑贞

    2003-01-01

    目的探讨腺苷脱氨酶(ADA)活性及其界限值对结核性胸膜炎的鉴别诊断价值.方法应用腺苷脱氨酶偶联谷氨酸脱氢酶连续检测法测定胸水及血清ADA,并运用统计学方法对数据进行处理.结果结核性胸膜炎和非结核性胸膜炎胸水ADA有显著差别(P<0.01),而血清ADA则无显著差别(P>0.05).结论胸水ADA在诊断结核性胸膜炎和非结核性胸膜炎上具有鉴别价值,而血清ADA则无意义.

  7. The pleural effusion diagnosis value of adenosine deaminase and carcino embryonic antigen detection%腺苷脱氨酶与癌胚抗原检测在胸腔积液诊断中的价值

    Institute of Scientific and Technical Information of China (English)

    张胜堂; 张秀卿; 宋滨东

    2010-01-01

    目的 分析腺苷脱氨酶(ADA)与癌胚抗原(CEA)检测在胸腔积液诊断和鉴别诊断中的应用价值.方法 对46例自2008年9月~2009年6月我院经治有胸腔积液症状的患者检测胸腔积液和血清ADA、CEA水平,对不同疾病组结果分析比较.结果 结核性胸腔积液组ADA为(43.00±13.82)U/L,CEA的含量为(1.25±1.22)μg/L;恶性胸腔积液组A-DA为(17.57±6.20)U/L,CEA为(293.74±197.50)μg/L.结核性胸腔积液组ADA含量较恶性胸腔积液组明显增高(P<0.01),恶性胸腔积液组CEA含量较结核性胸腔积液组明显增高(P<0.01).胸腔积液ADA(pADA)/血清ADA(sADA)及胸腔积液CEA(pCEA)/血清CEA(sCEA)比值,结核性胸腔积液组(2.69±0.83、1.05±0.89)与恶性胸腔积液组(0.87±0.22、9.47±5.91)相比有显著性差异(P<0.01),pADA及pCEA判断结核性胸腔积液的临界值分别为:39U/L、pCEA<5μg/L,恶性胸腔积液的敏感性为95%、特异性为99.8%.结论 胸腔积液腺苷脱氨酶与癌胚抗原测定对结核性胸腔积液和恶性胸腔积液的诊断具有重要价值.

  8. 阻断氯通道对人喉癌Hep-2细胞增殖及其RNA编辑酶1表达的影响%Effects of Blocking Chloride Channel on Proliferation and Expression of RNA-dependent Adenosine Deaminase 1 for Human Larynx Cancer Hep-2 Cell

    Institute of Scientific and Technical Information of China (English)

    余文发; 赵玉林; 董明敏

    2008-01-01

    目的 研究氯离子通道阻断荆5-硝基-2-(3-苯丙氨基)苯甲酸(NPPB)对人喉癌细胞系Hep-2细胞增殖及其RNA编辑酶1(RNA-dependent adenosine deaminase 1,ADARI)表达的影响.方法 以HeD-2细胞为研究对象,采用四甲基偶氮唑蓝(MTT)比色法检测NPPB对Hep-2细胞增殖的影响;用逆转录一聚合酶链反应(RT-PCR)检测氯通道阻断前后Hep-2细胞ADARI mRNA表达的变化.结果 NPPB浓度依赖性地抑制Hep-2细胞增殖,NPPB阻断Hep-2氯通道前后ADARl mRNA表达量存在显著性差异.结论 阻断Hep-2细胞氯通道,可抑制Hep-2细胞增殖;Hep-2细胞RNA编辑酶1的表达可能和氯通道密切相关.

  9. 胸水腺苷脱氨酶检测对结核性胸膜炎的诊断意义%Test for Adenosine Deaminase in Pleural Effusion for Diagnosing Tuberculous Pleuritis

    Institute of Scientific and Technical Information of China (English)

    钱海红; 赵建清

    2007-01-01

    目的:探讨胸水的腺苷脱氨酶(ADA)测定值对结核性胸膜炎的诊断意义和应用价值.方法:对436例住院的胸腔积液患者分别行结核菌素纯蛋白衍生物(PPD)试验,同时应用酶速率法检测胸水标本中ADA 的活性,比较二者的灵敏度及特异度.所有患者试验前均未行抗结核治疗.结果: ADA试验灵敏度(96.1%)高于PPD(90.2%),二者差异有显著性(P<0.05).结论:胸腔积液ADA含量的检测对于早期诊断及治疗结核性胸膜炎具有积极意义.

  10. Somatic mosaicism caused by monoallelic reversion of a mutation in T cells of a patient with ADA-SCID and the effects of enzyme replacement therapy on the revertant phenotype.

    Science.gov (United States)

    Moncada-Vélez, M; Vélez-Ortega, A; Orrego, J; Santisteban, I; Jagadeesh, J; Olivares, M; Olaya, N; Hershfield, M; Candotti, F; Franco, J

    2011-11-01

    Patients with adenosine deaminase (ADA) deficiency exhibit spontaneous and partial clinical remission associated with somatic reversion of inherited mutations. We report a child with severe combined immunodeficiency (T-B- SCID) due to ADA deficiency diagnosed at the age of 1 month, whose lymphocyte counts including CD4+ and CD8+ T and NK cells began to improve after several months with normalization of ADA activity in Peripheral blood lymphocytes (PBL), as a result of somatic mosaicism caused by monoallelic reversion of the causative mutation in the ADA gene. He was not eligible for haematopoietic stem cell transplantation (HSCT) or gene therapy (GT); therefore he was placed on enzyme replacement therapy (ERT) with bovine PEG-ADA. The follow-up of metabolic and immunologic responses to ERT included gradual improvement in ADA activity in erythrocytes and transient expansion of most lymphocyte subsets, followed by gradual stabilization of CD4+ and CD8+ T (with naïve phenotype) and NK cells, and sustained expansion of TCRγδ+ T cells. This was accompanied by the disappearance of the revertant T cells as shown by DNA sequencing from PBL. Although the patient's clinical condition improved marginally, he later developed a germinal cell tumour and eventually died at the age of 67 months from sepsis. This case adds to our current knowledge of spontaneous reversion of mutations in ADA deficiency and shows that the effects of the ERT may vary among these patients, suggesting that it could depend on the cell and type in which the somatic mosaicism is established upon reversion.

  11. Effect of zinc supplementation on E-ADA activity, seric zinc, and cytokines levels of Trypanosoma evansi infected Wistar rats.

    Science.gov (United States)

    Bottari, Nathieli B; Baldissera, Matheus D; Oliveira, Camila B; Duarte, Thiago; Duarte, Marta M M F; Leal, Marta L R; Thomé, Gustavo R; Zanini, Daniela; Schetinger, Maria Rosa C; Nunes, Matheus A G; Dressler, Valderi L; Monteiro, Silvia G; Tonin, Alexandre A; Da Silva, Aleksandro S

    2014-09-01

    The aim of this study was to evaluate the effect of zinc supplementation on the ecto-adenosine deaminase activity (E-ADA), zinc seric levels and cytokines (TNF-α, IL-1, IL-6, and IL -10) on rats experimentally infected by Trypanosoma evansi. Four groups with 10 rats each were used as negative controls (groups A and B), while the animals from the groups C and D were infected intraperitoneally with 0.1 mL of cryopreserved blood containing 1.4 × 10(4) of trypanosomes. Animals of groups B and D received two doses of Zinc (Zn) at 5 mg kg(-1), subcutaneously, on the 2nd and 7th day post-infection (PI). Blood samples were collected on days 5 (n = 5) and 15 PI (n = 5). Zn supplementation was able to increase the rat's longevity and to reduce their parasitemia. It was observed that seric Zn levels were increased on infected animals under Zn supplementation. Animals that were infected and supplemented with Zn showed changes in E-ADA activity and in cytokine levels (P < 0.05). Zn supplementation of healthy animals (Group B), increased the E-ADA activity, as well as reduced the concentration of cytokines. Infected animals from groups C and D showed increased levels of cytokines. Finally, we observed that Zn supplementation led to a modulation on cytokine's level in rats infected by T. evansi, as well as in E-ADA activity.

  12. Study on the diagnostic value of adenosine deaminase in the tuberculous pleurisy%腺苷脱氨酶在结核性胸膜炎的诊断价值研究

    Institute of Scientific and Technical Information of China (English)

    梁清涛; 饶海涛; 郭超; 杨扬; 李华; 卜建玲; 杨新婷; 陈效友

    2014-01-01

    目的 探讨腺苷脱胺酶(ADA)在结核性胸膜炎中的诊断价值.方法 收集自2012年1月至2013年12月于首都医科大学附属北京胸科医院住院的胸腔积液患者血清及胸腔积液标本160例;分别为130例结核性胸膜炎患者和30例癌性胸膜炎患者.所有患者胸腔积液及血清ADA采用全自动生化分析仪进行测定;计算胸腔积液与血清的ADA比值(pADA/sADA).采用SPSS 19.0统计软件进行处理,计量资料采取t检验,计数资料采用x2检验,P<0.05时,两组间差异有统计学意义.结果 (1)结核性胸膜炎患者胸腔积液ADA、血清ADA值及pADA/sADA分别为(55.8±19.5)U/L、(19.6±8.8)U/L、(3.1±1.2);明显高于癌性胸膜炎患者[分别为(11.1±5.0)U/L、(11.0±5.7)U/L、(1.1±0.5)],差异有统计学意义(t值分别为21.5、5.6、12.8,P值均<0.001).(2)结核性胸膜炎患者,以年龄≥55岁为界限分为高龄与低龄两组,高龄组胸腔积液ADA值为(49.0±22.6)U/L,明显低于低龄组[(57.8±18.5)U/L],差异有统计学意义(t=2.3,P<0.05);年龄因素在血清ADA检测结果上差异无统计学意义[两组ADA值分别为(20.3±8.9)U/L、(19.3±8.8)U/L,t=0.6,P>0.05].(3)以胸腔积液ADA值≥30 U/L为界限值,对结核性胸膜炎诊断的敏感度为95.4% (124/130),特异度为96.7% (29/30),阳性预测值99.2%(124/125),阴性预测值82.9% (29/35).(4)以pADA/sADA≥1.8为界限值,对结核性胸膜炎诊断的敏感度、特异度分别为89.2%(116/130)、93.3%(28/30),阳性预测值98.3% (116/118),阴性预测值66.7% (28/42).结论 以胸腔积液ADA≥30 U/L对结核性胸膜炎诊断有很高的敏感度与特异度;以胸腔积液ADA/血清ADA≥1.8为指标,对于鉴别结核性胸膜炎与癌性胸膜炎亦有一定价值.

  13. Altered E-NTPDase/E-ADA activities and CD39 expression in platelets of sickle cell anemia patients.

    Science.gov (United States)

    Castilhos, Lívia G; Doleski, Pedro H; Adefegha, Stephen A; Becker, Lara V; Ruchel, Jader B; Leal, Daniela B R

    2016-04-01

    Sickle cell anemia (SCA) is a hemoglobinopathy characterized by hemolysis and vaso-occlusions caused by rigidly distorted red blood cells. Sickle cell crisis is associated with extracellular release of nucleotides and platelets, which are critical mediators of hemostasis participating actively in purinergic thromboregulatory enzymes system.This study aimed to investigate the activities of purinergic system ecto-enzymes present on the platelet surface as well as CD39 and CD73 expressions on platelets of SCA treated patients. Fifteen SCA treated patients and 30 health subjects (control group) were selected. Ecto-nucleoside triphosphate diphosphohydrolase (E-NTPDase), ecto-5'-nucleotidase (E-5'-NT) and ecto-adenosine deaminase (E-ADA) activities were measured in platelets isolated from these individuals. Results demonstrated an increase of 41 % in the E-NTPDase for ATP hydrolysis, 52% for ADP hydrolysis and 60 % in the E-ADA activity in SCA patients (P<0.05); however, a two folds decrease in the CD39 expression in platelets was observed in the same group (P<0.01). The increased E-NTPDase activity could be a compensatory mechanism associated with the low expression of CD39 in platelets. Besides, alteration of these enzymes activities suggests that the purinergic system could be involved in the thromboregulatory process in SCA patients.

  14. 脑脊液腺苷脱氨酶在AIDS合并结核性脑膜炎诊断及疗效评估中的价值%Value of adenosine deaminase in cerebrospinal fluid for diagnosis and efficacy evaluation of AIDS complicated with tuberculous meningitis

    Institute of Scientific and Technical Information of China (English)

    陈跃华; 陆宁; 林艳荣; 刘升; 兰江

    2015-01-01

    目的:探讨脑脊液腺苷脱氨酶( ADA)测定对AIDS合并结核性脑膜炎的诊断及疗效评估价值。方法回顾性分析该院收治的AIDS合并结核性脑膜炎30例(结核性脑膜炎组)的临床资料,其中CD4+T淋巴细胞>200个/μl者14例;CD4+T淋巴细胞≤200个/μl者16例,于入院1周内治疗前、治疗后2周、4周、6周检测其脑脊液的ADA值。选择同期AIDS合并新型隐球菌性脑膜炎26例(隐球菌性脑膜炎组),AIDS合并弓形虫脑炎12例(弓形虫脑炎组),检测其入院治疗前脑脊液ADA。结果结核性脑膜炎组患者治疗前脑脊液ADA水平均高于其他两组( P<0.05);不同CD4+T淋巴细胞水平的AIDS合并结核性脑膜炎患者脑脊液ADA水平比较,差异无统计学意义(P>0.05);AIDS合并结核性脑膜炎患者治疗后2周、治疗后4周及治疗后6周的ADA水平均低于入院时ADA水平(P<0.05),治疗后4周的ADA水平低于治疗后2周( P<0.05),治疗后6周的ADA水平亦低于治疗后4周(P<0.05)。结论脑脊液ADA在AIDS合并结核性脑膜炎的早期诊断及疗效评估中具有重要意义。%Objective To investigate the value of detecting denosine deaminase ( ADA) in cerebrospinal fluid for the diagnosis and efficacy evaluation of AIDS complicated with tuberculous meningitis .Methods The clinical data of 30 patients with AIDS complicated with tuberculosis meningitis ( tuberculous meningitis group ) were retrospectively analyzed .The 30 cases included 14 cases of CD4 +T lymphocytes >200/μl and 16 cases of CD4 +T lymphocytes ≤200/μl.And the levels of ADA in cerebrospinal fluid were detected in 30 patients before treatment and within one week after admission,2,4 and 6 weeks after treatment.Twenty-six cases of AIDS complicated with novel cryptococcal meningitis ( cryptococcal meningitis group ) and 12 of AIDS complicated with toxoplasmic encephalitis ( toxoplasmic

  15. The role of adenosine receptors and endogenous adenosine in citalopram-induced cardiovascular toxicity

    Directory of Open Access Journals (Sweden)

    Kubilay Oransay

    2014-01-01

    Full Text Available Aim: We investigated the role of adenosine in citalopram-induced cardiotoxicity. Materials and Methods: Protocol 1: Rats were randomized into four groups. Sodium cromoglycate was administered to rats. Citalopram was infused after the 5% dextrose, 8-Cyclopentyl-1,3-dipropylxanthine (DPCPX; A 1 receptor antagonist, 8-(-3-chlorostyryl-caffeine (CSC; A 2a receptor antagonist, or dimethyl sulfoxide (DMSO administrations. Protocol 2: First group received 5% dextrose intraperitoneally 1 hour prior to citalopram. Other rats were pretreated with erythro-9-(2-hydroxy-3-nonyl adenine (EHNA; inhibitor of adenosine deaminase and S-(4-Nitrobenzyl-6-thioinosine (NBTI; inhibitor of facilitated adenosine transport. After pretreatment, group 2 received 5% dextrose and group 3 received citalopram. Adenosine concentrations, mean arterial pressure (MAP, heart rate (HR,  QRS duration and QT interval were evaluated. Results: In the dextrose group, citalopram infusion caused a significant decrease in MAP and HR and caused a significant prolongation in QRS and QT. DPCPX infusion significantly prevented the prolongation of the QT interval when compared to control. In the second protocol, citalopram infusion did not cause a significant change in plasma adenosine concentrations, but a significant increase observed in EHNA/NBTI groups. In EHNA/NBTI groups, citalopram-induced MAP and HR reductions, QRS and QT prolongations were more significant than the dextrose group. Conclusions: Citalopram may lead to QT prolongation by stimulating adenosine A 1 receptors without affecting the release of adenosine.

  16. Integration of retroviral vectors induces minor changes in the transcriptional activity of T cells from ADA-SCID patients treated with gene therapy.

    Science.gov (United States)

    Cassani, Barbara; Montini, Eugenio; Maruggi, Giulietta; Ambrosi, Alessandro; Mirolo, Massimiliano; Selleri, Silvia; Biral, Erika; Frugnoli, Ilaria; Hernandez-Trujillo, Vivian; Di Serio, Clelia; Roncarolo, Maria Grazia; Naldini, Luigi; Mavilio, Fulvio; Aiuti, Alessandro

    2009-10-22

    Gene transfer into hematopoietic stem cells by gamma-retroviral vectors (RVs) is an effective treatment for inherited blood disorders, although potentially limited by the risk of insertional mutagenesis. We evaluated the genomic impact of RV integration in T lymphocytes from adenosine deaminase-deficient severe combined immunodeficiency (ADA-SCID) patients 10 to 30 months after infusion of autologous, genetically corrected CD34(+) cells. Expression profiling on ex vivo T-cell bulk population revealed no difference with respect to healthy controls. To assess the effect of vector integration on gene expression at the single-cell level, primary T-cell clones were isolated from 2 patients. T-cell clones harbored either 1 (89.8%) or 2 (10.2%) vector copies per cell and displayed partial to full correction of ADA expression, purine metabolism, and T-cell receptor-driven functions. Analysis of RV integration sites indicated a high diversity in T-cell origin, consistently with the polyclonal T-cell receptor-Vbeta repertoire. Quantitative transcript analysis of 120 genes within a 200-kb window around RV integration sites showed modest (2.8- to 5.2-fold) dysregulation of 5.8% genes in 18.6% of the T-cell clones compared with controls. Nonetheless, affected clones maintained a stable phenotype and normal in vitro functions. These results confirm that RV-mediated gene transfer for ADA-SCID is safe, and provide crucial information for the development of future gene therapy protocols. The trials described herein have been registered at http://www.clinicaltrials.gov as #NCT00598481 and #NCT00599781.

  17. The Interactive ADA Workstation

    Science.gov (United States)

    1990-05-01

    3. Masking Union with Ada Homograph Definition 46 Figure 5-4. Direct Environment Computation with Masking Unions 50 Figure 5-5. Full Ada Body Direct...as a homograph test in Ada) that determines if two ele- ments are "indistinguishable" according to some criteria, the following rules determine...membership in a masking union: A member of the dominant set is a member of the masking union if and only if it has no homograph in the dominant set. In other

  18. Software engineering capability for Ada (GRASP/Ada Tool)

    Science.gov (United States)

    Cross, James H., II

    1995-01-01

    The GRASP/Ada project (Graphical Representations of Algorithms, Structures, and Processes for Ada) has successfully created and prototyped a new algorithmic level graphical representation for Ada software, the Control Structure Diagram (CSD). The primary impetus for creation of the CSD was to improve the comprehension efficiency of Ada software and, as a result, improve reliability and reduce costs. The emphasis has been on the automatic generation of the CSD from Ada PDL or source code to support reverse engineering and maintenance. The CSD has the potential to replace traditional prettyprinted Ada Source code. A new Motif compliant graphical user interface has been developed for the GRASP/Ada prototype.

  19. Discovery of a cAMP deaminase that quenches cyclic AMP-dependent regulation.

    Science.gov (United States)

    Goble, Alissa M; Feng, Youjun; Raushel, Frank M; Cronan, John E

    2013-12-20

    An enzyme of unknown function within the amidohydrolase superfamily was discovered to catalyze the hydrolysis of the universal second messenger, cyclic-3',5'-adenosine monophosphate (cAMP). The enzyme, which we have named CadD, is encoded by the human pathogenic bacterium Leptospira interrogans. Although CadD is annotated as an adenosine deaminase, the protein specifically deaminates cAMP to cyclic-3',5'-inosine monophosphate (cIMP) with a kcat/Km of 2.7 ± 0.4 × 10(5) M(-1) s(-1) and has no activity on adenosine, adenine, or 5'-adenosine monophosphate (AMP). This is the first identification of a deaminase specific for cAMP. Expression of CadD in Escherichia coli mimics the loss of adenylate cyclase in that it blocks growth on carbon sources that require the cAMP-CRP transcriptional activator complex for expression of the cognate genes. The cIMP reaction product cannot replace cAMP as the ligand for CRP binding to DNA in vitro and cIMP is a very poor competitor of cAMP activation of CRP for DNA binding. Transcriptional analyses indicate that CadD expression represses expression of several cAMP-CRP dependent genes. CadD adds a new activity to the cAMP metabolic network and may be a useful tool in intracellular study of cAMP-dependent processes.

  20. Temporal variations of adenosine metabolism in human blood.

    Science.gov (United States)

    Chagoya de Sánchez, V; Hernández-Muñoz, R; Suárez, J; Vidrio, S; Yáñez, L; Aguilar-Roblero, R; Oksenberg, A; Vega-González, A; Villalobos, L; Rosenthal, L; Fernández-Cancino, F; Drucker-Colín, R; Díaz-Muñoz, M

    1996-08-01

    Eight diurnally active (06:00-23:00 h) subjects were adapted for 2 days to the room conditions where the experiments were performed. Blood sampling for adenosine metabolites and metabolizing enzymes was done hourly during the activity span and every 30 min during sleep. The results showed that adenosine and its catabolites (inosine, hypoxanthine, and uric acid), adenosine synthesizing (S-adenosylhomocysteine hydrolase and 5'-nucleotidase), degrading (adenosine deaminase) and nucleotide-forming (adenosine kinase) enzymes as well as adenine nucleotides (AMP, ADP, and ATP) undergo statistically significant fluctuations (ANOVA) during the 24 h. However, energy charge was invariable. Glucose and lactate chronograms were determined as metabolic indicators. The same data analyzed by the chi-square periodogram and Fourier series indicated ultradian oscillatory periods for all the metabolites and enzymatic activities determined, and 24-h oscillatory components for inosine, hypoxanthine, adenine nucleotides, glucose, and the activities of SAH-hydrolase, 5'-nucleotidase, and adenosine kinase. The single cosinor method showed significant oscillatory components exclusively for lactate. As a whole, these results suggest that adenosine metabolism may play a role as a biological oscillator coordinating and/or modulating the energy homeostasis and physiological status of erythrocytes in vivo and could be an important factor in the distribution of purine rings for the rest of the organism.

  1. Growth inhibition of human breast cancer cells and down-regulation of ODC1 and ADA genes by Nepeta binaloudensis

    Directory of Open Access Journals (Sweden)

    Akbar Safipour Afshar

    Full Text Available ABSTRACT Nepeta binaloudensis Jamzad, Lamiaceae, is a rare medicinal plant endemic to Iran. In spite of many studies about the chemical constituents and antibacterial effects of this species, no report has been provided about its cytotoxic and anticancer activities. In this study we have evaluated the effects of EtOH 70%, hexane and aqueous extracts of N. binaloudensis on the cell proliferation and n-hexane extract on the expression of adenosine deaminase and ornithine decarboxylase 1 genes in breast cancer cell lines (MCF-7, MDA-MB-231 compared to non-cancer line (MCF-10A. The cell lines were subjected to increasing doses of the extracts ranging from 10 to 320 µg/ml. Cell viability was quantified by MTS assay. Expression of adenosine deaminase and ornithine decarboxylase 1 genes was analyzed by real time PCR. N. binaloudensis inhibited the growth of malignant cells in a time and dose-dependent manner. Among extracts of N. binaloudensis, the hexane extract was found to be more toxic compared to other extracts. Results showed a marked decrease in the expression of ornithine decarboxylase 1 and adenosine deaminase genes in cancer cell lines. At 60 µg/ml concentration of N. binaloudensis hexane extract ornithine decarboxylase 1 and adenosine deaminase mRNA expression were reduced 4.9 fold and 3.5 fold in MCF-7 cell line and 3.6 fold and 2.6 fold in MDA-MB-231 cell line compared to control, respectively. The result of our study highlights the potential influences of N. binaloudensis hexane extract on ornithine decarboxylase 1 and adenosine deaminase genes expression in breast cancer cells and its relation to inhibition of cancer cell growth.

  2. Inhibition of AMP deaminase as therapeutic target in cardiovascular pathology.

    Science.gov (United States)

    Zabielska, Magdalena A; Borkowski, Tomasz; Slominska, Ewa M; Smolenski, Ryszard T

    2015-08-01

    AMP deaminase (AMPD; EC 3.5.4.6) catalyzes hydrolysis of the amino group from the adenine ring of AMP resulting in production of inosine 5'-monophosphate (IMP) and ammonia. This reaction helps to maintain healthy cellular energetics by removing excess AMP that accumulates in energy depleted cells. Furthermore, AMPD permits the synthesis of guanine nucleotides from the larger adenylate pool. This enzyme competes with cytosolic 5'-nucleotidases (c5NT) for AMP. Adenosine, a product of c5NT is a vasodilator, antagonizes inotropic effects of catecholamines and exerts anti-platelet, anti-inflammatory and immunosuppressive activities. The ratio of AMPD/c5NT defines the amount of adenosine produced in adenine nucleotide catabolic pathway. Inhibition of AMPD could alter this ratio resulting in increased adenosine production. Besides the potential effect on adenosine production, elevation of AMP due to inhibition of AMPD could also lead to activation of AMP regulated protein kinase (AMPK) with myriad of downstream events including enhanced energetic metabolism, mitochondrial biogenesis and cytoprotection. While the benefits of these processes are well appreciated in cells such as skeletal or cardiac myocytes its role in protection of endothelium could be even more important. Therapeutic use of AMPD inhibition has been limited due to difficulties with obtaining compounds with adequate characteristics. However, endothelium seems to be the easiest target as effective inhibition of AMPD could be achieved at much lower concentration than in the other types of cells. New generation of AMPD inhibitors has recently been established and its testing in context of endothelial and organ protection could provide important basic knowledge and potential therapeutic tools.

  3. High-throughput assay of adenosine in fermentation broth based on enzyme catalysis%酶法高通量测定发酵液中的腺苷含量

    Institute of Scientific and Technical Information of China (English)

    李宁; 董会娜; 祖昕; 张大伟; 吴勇杰

    2015-01-01

    腺苷是合成阿糖腺苷、腺苷酸(AMP)、三磷酸腺苷(ATP)的主要原料,是一种重要的医药原料.目前,微生物发酵生产腺苷越来越受到重视,会产生大量的发酵液样品需要检测.基于腺苷脱氨酶(ADA)建立了一种快速、高通量检测发酵液腺苷的方法.实验结果表明,响应面方法优化检测试剂浓度为碳酸钠-碳酸氢钠34.20mmol/L-27.40 mmol/L,亚硝基铁氰化钠3.35 g/L,次氯酸钠的有效氯为0.172 5%,百里香酚6.64 g/L.该方法检测灵敏,检测限为0.025~6 mmol/L,能够满足发酵检测和高通量筛选的需要.%Adenosine is the main raw material for the production of vidarabine,adenosine monophosphate (AMP) and adenosinetriphosphate (ATP).Adenosine is also an important pharmaceutical raw materials.At present,microbial fermentation production of adenosoine will produce large amounts of fermentation samples to be detected A rapid high -throughput method for detecting adenosine in fermentation broth based on adenosine deaminase (ADA)was estabished.Using response surface model analysis to determine the optimum concentration of four substances,the results showed sodium carbonate-sodium bicarbonate 34.20 mmol/L-27.40 mmol/L,sodium nitropmssid 3.35 g/L,the effective chlorine of sodium hypochlorite 0.172 5%,thymol 6.64 g/L.The limit of detection was between 0.025 mmo1/L and 6 mmo1/L,this method is sensitive and can meet the needs of the fermentation detection and high-throughput screening.

  4. Clinical value of tuberculosis protein chip combined with ADA levels of pleural effusion in diagnosis of tuberculos pleuritis%结核蛋白芯片联合胸水ADA检测对结核性胸膜炎的诊断价值

    Institute of Scientific and Technical Information of China (English)

    杨冬梅; 陈小菊; 刘小燕; 陈绍平

    2012-01-01

    目的:探讨结核蛋白芯片联合胸水腺苷脱氨酶( adenosine deaminase,ADA)检测对结核性胸膜炎的诊断价值.方法:对42例结核性胸腔积液患者和36例恶性胸腔积液患者血清标本进行结核蛋白芯片检测,同时检测胸水ADA.结果:42例结核性胸腔积液患者,结核蛋白芯片检测的灵敏度为69.05%,特异度为91.67%;而胸水ADA的灵敏度为83.33%,特异度为88.89%.两者联合检测的灵敏度为95.24%,高于单一结核蛋白芯片(69.05%)或胸水ADA (83.33%),差异有统计学意义(P<0.05).两者联合检测的特异度为83.33%,低于单一结核蛋白芯片(91.67%)或胸水ADA( 88.89%),差异无统计学意义(P>0.05).结论:结核蛋白芯片联合胸水ADA检测可提高结核性胸膜炎的灵敏度,可作为结核性胸腔积液辅助诊断的有效方法.

  5. Adenosine and adenosine receptors: Newer therapeutic perspective

    Directory of Open Access Journals (Sweden)

    Manjunath S

    2009-01-01

    Full Text Available Adenosine, a purine nucleoside has been described as a ′retaliatory metabolite′ by virtue of its ability to function in an autocrine manner and to modify the activity of a range of cell types, following its extracellular accumulation during cell stress or injury. These effects are largely protective and are triggered by binding of adenosine to any of the four adenosine receptor subtypes namely A1, A2a, A2b, A3, which have been cloned in humans, and are expressed in most of the organs. Each is encoded by a separate gene and has different functions, although overlapping. For instance, both A1 and A2a receptors play a role in regulating myocardial oxygen consumption and coronary blood flow. It is a proven fact that adenosine plays pivotal role in different physiological functions, such as induction of sleep, neuroprotection and protection against oxidative stress. Until now adenosine was used for certain conditions like paroxysmal supraventricular tachycardia (PSVT and Wolff Parkinson White (WPW syndrome. Now there is a growing evidence that adenosine receptors could be promising therapeutic targets in a wide range of conditions including cardiac, pulmonary, immunological and inflammatory disorders. After more than three decades of research in medicinal chemistry, a number of selective agonists and antagonists of adenosine receptors have been discovered and some have been clinically evaluated, although none has yet received regulatory approval. So this review focuses mainly on the newer potential role of adenosine and its receptors in different clinical conditions.

  6. The AdaBoost Flow

    OpenAIRE

    Lykov, A.; Muzychka, S.; Vaninsky, K.

    2011-01-01

    We introduce a dynamical system which we call the AdaBoost flow. The flow is defined by a system of ODEs with control. We show that three algorithms of the AdaBoost family (i) the AdaBoost algorithm of Schapire and Freund (ii) the arc-gv algorithm of Breiman (iii) the confidence rated prediction of Schapire and Singer can be can be embedded in the AdaBoost flow. The nontrivial part of the AdaBoost flow equations coincides with the equations of dynamics of nonperiodic Toda system written in te...

  7. Rescue of the Orphan Enzyme Isoguanine Deaminase

    Science.gov (United States)

    Hitchcock, Daniel S.; Fedorov, Alexander A.; Fedorov, Elena V.; Dangott, Lawrence J.; Almo, Steven C.; Raushel, Frank M.

    2011-01-01

    Cytosine deaminase (CDA) from Escherichia coli was shown to catalyze the deamination of isoguanine (2-oxoadenine) to xanthine. Isoguanine is an oxidation product of adenine in DNA that is mutagenic to the cell. The isoguanine deaminase activity in E. coli was partially purified by ammonium sulfate fractionation, gel filtration and anion exchange chromatography. The active protein was identified by peptide mass fingerprint analysis as cytosine deaminase. The kinetic constants for the deamination of isoguanine at pH 7.7 are kcat = 49 s-1, Km = 72 μM, and kcat/Km = 6.7 × 105 M-1 s-1. The kinetic constant for the deamination of cytosine are kcat = 45 s-1, Km = 302 μM, and kcat/Km = 1.5 × 105 M-1 s-1. Under these reaction conditions isoguanine is the better substrate for cytosine deaminase. The three dimensional structure of CDA was determined with isoguanine in the active site. PMID:21604715

  8. Ada Compiler Validation Summary Report: NYU Ada/ED, Version 19.7 V-001.

    Science.gov (United States)

    1983-04-11

    ETs4~4 B37201A.ADA P SCz28 CTx7O ECal3 B37202A.ADA P SC.=44 CT263 ECaig B37202B. ADA P SCz ? CTz8 ECzl B37203A.ADA P SCz14I CTxl9 ECx6 aB3720IA-AB.ADA P...SCx27 CT=61 LT z12. 8 £7.49C52005C.ADA P SCz17 C7.37 LTx11.0 £Tx48 C52005D.ADA P SCz -53 CTz107 1.7.15.7 E7.76 C52005E.ADA P Scx39 C7.87 1.7.13.5 £7.52...SCa? C7.21 ECal B55AOlD-AB.ADk P SCx ? C7.13 M~al D55A01£-AB.ADA P SC.? CTwl7 ECal B55AOlF-AB.ADA P SCull CTx12 ECal B55A01G-AB.ADA P SCull C~zl6 ECal

  9. Diagnostic value of hydrothorax Mononuclear cell and ADA in tuberculous pleuritis%胸水单核细胞联合胸水 ADA 在结核性胸膜炎中的诊断价值

    Institute of Scientific and Technical Information of China (English)

    张新军; 童朝晖

    2014-01-01

    Objective:To investigate the diagnostic value of hydrothorax ADA and Mononuclear cell in tuberculous pleuritis. Methods:All patients were diagnosed clearly by medical thoracoscopy. Pleural effusion in 120 cases with tuberculous pleurisy and 147 cases with non-tuberculous pleuritis was analyzed and the hydrothorax ADA value and the proportion of Mononuclear cell in pleural ef-fusion were recorded and analyzed through the receiver operator characteristic curve (ROC) in order to find out the optimum critical value to diagnose tuberculous pleuritis and its sensitivity and specificity. Results: Through the ROC curve analysis, the percentage of the area under the curve of pleural effusion Mononuclear cell was 0. 593; when the value was 84. 5% , the diagnostic sensitivity and specificity were 63. 3% and 53. 7% , respectively, thereby indicating that the diagnostic value was lower. Hydrothorax ADA area under the curve was 0. 925, when the value was 28. 7U/ L, the diagnostic sensitivity and specificity were 88. 3% and 90. 5% , respectively, thereby showing a better diagnostic value. When combing the proportion of Mononuclear cell of 84. 5% with the hydrothorax ADA value of 28. 7U/ L, the diagnostic sensitivity, specificity, positive predictive value, and negative predictive value were 57. 5% , 98% , 95. 85 and 73. 8% , respectively; the higher specificity and positive predictive value were helpful to the diagnosis of tuberculous pleuritis. Conclusions: Hydrothorax ADA has a diagnosis value for tuberculous pleurisy. The combination of the formers will contribute to the i-dentification between tuberculous and non tuberculous pleural effusion.%目的:探讨胸水单核细胞联合胸水腺苷脱氨酶(EC:3.5.4.4 adenosine deaminase,ADA)在结核性胸膜炎中的诊断价值。方法:对胸腔镜下明确诊断的120例结核性胸膜炎患者和147例非结核胸膜炎患者胸水进行分析,记录胸水中单核细胞比例及胸水 ADA 数值,通过受试者工作

  10. ARE: Ada Rendering Engine

    Directory of Open Access Journals (Sweden)

    Stefano Penge

    2009-10-01

    Full Text Available E' ormai pratica diffusa, nello sviluppo di applicazioni web, l'utilizzo di template e di potenti template engine per automatizzare la generazione dei contenuti da presentare all'utente. Tuttavia a volte la potenza di tali engine è€ ottenuta mescolando logica e interfaccia, introducendo linguaggi diversi da quelli di descrizione della pagina, o addirittura inventando nuovi linguaggi dedicati.ARE (ADA Rendering Engine è€ pensato per gestire l'intero flusso di creazione del contenuto HTML/XHTML dinamico, la selezione del corretto template, CSS, JavaScript e la produzione dell'output separando completamente logica e interfaccia. I templates utilizzati sono puro HTML senza parti in altri linguaggi, e possono quindi essere gestiti e visualizzati autonomamente. Il codice HTML generato è€ uniforme e parametrizzato.E' composto da due moduli, CORE (Common Output Rendering Engine e ALE (ADA Layout Engine.Il primo (CORE viene utilizzato per la generazione OO degli elementi del DOM ed è pensato per aiutare lo sviluppatore nella produzione di codice valido rispetto al DTD utilizzato. CORE genera automaticamente gli elementi del DOM in base al DTD impostato nella configurazioneIl secondo (ALE viene utilizzato come template engine per selezionare automaticamente in base ad alcuni parametri (modulo, profilo utente, tipologia del nodo, del corso, preferenze di installazione il template HTML, i CSS e i file JavaScript appropriati. ALE permette di usare templates di default e microtemplates ricorsivi per semplificare il lavoro del grafico.I due moduli possono in ogni caso essere utilizzati indipendentemente l'uno dall'altro. E' possibile generare e renderizzare una pagina HTML utilizzando solo CORE oppure inviare gli oggetti CORE al template engine ALE che provvede a renderizzare la pagina HTML. Viceversa è possibile generare HTML senza utilizzare CORE ed inviarlo al template engine ALECORE è alla prima release ed è€ già utilizzato all

  11. 结核性胸膜炎患者腺苷脱氨酶与总蛋白、乳酸脱氢酶及其比值的相关性分析%Correlation Analysis on Pleural Effusion and Serum Levels of Adenosine Deaminase, Total Protein and Lactate Dehydrogenase and Their Ratio in Patients with Tuberculous Pleurisy

    Institute of Scientific and Technical Information of China (English)

    邵俊国; 叶迎宾; 黄秀香; 张萍

    2015-01-01

    目的 探讨胸水与血清中的腺苷脱氨酶(ADA)与总蛋白(TP)、乳酸脱氢酶(LDH)及其比值在结核性胸膜炎患者中的相关性.方法 随机抽取2014年上半年本院收治的结核性胸膜炎患者50例(结核组),肝性胸水(对照组)20例,进行胸水和血清的ADA、TP、LDH检测,计算其相应的比值,分析胸水和血清中ADA、TP、LDH及其比值之间的相关性.结果 结核组中ADA、TP、LDH含量及其比值明显高于对照组,差异具有统计学意义(P<0.05).结核组的胸水ADA与TP、LDH呈直线正相关(P<0.01);血清ADA与TP呈直线正相关(P<0.01),与LDH无相关(P>0.05);胸水ADA与血清ADA的比值(PADA/SADA)与胸水LDH与血清LDH的比值(PLDH/SLDH)呈正相关(P<0.01),与胸水TP与血清TP比值(PTP/STP)无相关(P>0.05).结论 胸水与血清中的ADA、TP、LDH及其比值在结核性胸膜炎诊断中具有重要的临床意义.

  12. Ada for multi-microprocessors

    Energy Technology Data Exchange (ETDEWEB)

    Tedd, M.; Crespi-Reghizzi, S.; Natali, A.

    1984-01-01

    This book presents papers on the use of the Ada programming language in array processors. Topics considered include distributed data processing, examples of distributed systems, requirements for the programming language and tools, the suitability of Ada and Apse, strategies for developing distributed systems, the construction system, reliability and extensibility, and the MML programming language.

  13. Isolation and properties of AMP deaminase from jumbo squid (Dosidicus gigas) mantle muscle from the Gulf of California, Mexico.

    Science.gov (United States)

    Marquez-Rios, E; Pacheco-Aguilar, R; Castillo-Yañez, F J; Figueroa-Soto, C G; Ezquerra-Brauer, J M; Gollas-Galvan, T

    2008-09-01

    Adenosine monophosphate (AMP) deaminase was purified from jumbo squid mantle muscle by chromatography in cellulose phosphate, Q-Fast and 5'-AMP sepharose. Specific activity of 2.5U/mg protein, 4.5% recovery and 133.68 purification fold were obtained at the end of the experiment. SDS-PAGE showed a single band with 87kDa molecular mass, native PAGE proved a band of 178kDa, whereas gel filtration detected a 180kDa protein, suggesting the homodimeric nature of this enzyme, in which subunits are not linked by covalent forces. Isoelectric focusing of this enzyme showed a pI of 5.76, which agrees with pI values of AMP deaminase from other invertebrate organisms. AMP deaminase presented a kinetic sigmoidal plot with Vmax of 1.16μM/min/mg, Km of 13mM, Kcat of 3.48μM.s(-1) and a Kcat/Km of 267 (mol/L)(-1).s(-1). The apparent relative low catalytic activity of jumbo squid muscle AMP deaminase in the absence of positive effectors is similar to that reported for homologous enzymes in other invertebrate organisms.

  14. 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.

  15. The AdaBoost Flow

    CERN Document Server

    Lykov, A; Vaninsky, K

    2011-01-01

    We introduce a dynamical system which we call the AdaBoost flow. The flow is defined by a system of ODEs with control. We show how by a suitable choice of control AdaBoost algorithm of Schapire and Freund and arc-gv algorithm of Breiman can be embedded in the AdaBoost flow. We also show how previously studied by Schapire and Singer confidence rated prediction can be obtained from our continuous time approach. We introduce a new continuous time algorithm which we call superBoost and describe its properties. The AdaBoost flow equations coincide with the equations of dynamics of the nonperiodic Toda system written in terms of spectral variables. This establishes a connection between two seemingly unrelated fields of boosting algorithms and classical integrable models. Finally we explain similarity of the AdaBoost flow with Perelman's ideas to control Ricci flow.

  16. 干扰素-γ含量和腺苷脱氨酶活性对结核性和肿瘤性胸腔积液的鉴别诊断价值%Diagnostic Value of Interferon-γ and Adenosine Deaminase in Pleural Effusion of Tuberculous and Malignamt Tumor

    Institute of Scientific and Technical Information of China (English)

    林存智; 朱新红; 华裕忠; 王明民; 牛娟娟

    2007-01-01

    目的 探讨细胞因子干扰素-γ(IFN-γ)的含量和腺苷脱氨酶(ADA)的活性在结核和肿瘤患者胸腔积液和外周血中的变化以及对胸腔积液的诊断价值.方法 应用酶联免疫吸附试验(ELISA)分别检测36例结核性胸膜炎并胸腔积液和30例恶性肿瘤并胸腔积液患者胸腔积液和外周血中IFN-γ的含量;应用比色法检测两组患者胸腔积液和外周血中ADA的活性,同时检测40例健康对照者外周血中IFN-γ的含量和ADA的活性作为对照.结果 结核组患者胸腔积液中IFN-γ的含量明显高于肿瘤组(P<0.001);两组患者与对照者外周血中IFN-γ的含量间差异无显著性意义(P>0.05).结核组患者胸腔积液中ADA(PADA)的活性明显高于肿瘤组(P<0.05),也高于自身外周血中ADA(SADA)的活性(P<0.001),而且PADA /SADA>1;肿瘤组患者胸腔积液和自身外周血中ADA活性间差异无显著性意义(P>0.05),PADA/SADA<1;结核组患者外周血中ADA的活性高于肿瘤组和对照组(P<0.01);肿瘤组患者与对照者外周血中ADA的活性间差异无显著性意义(P>0.05).以胸腔积液中IFN-γ的含量300 pg/L为临界值,对结核性胸腔积液诊断的灵敏度和特异度分别为97%和94%,约登指数为91%;以胸腔积液中ADA的活性40 U/L为临界值,对结核性胸腔积液诊断的灵敏度和特异度分别为97%和98%,约登指数为95%.结论 胸腔积液中IFN-γ的含量和ADA的活性可以作为鉴别结核性和肿瘤性胸腔积液的参考依据.

  17. 腺苷脱氨酶用于结核性与肿瘤性胸腹水鉴别诊断的meta分析%Meta-analysis of determination of adenosine deaminase for differential diagnosis of tuberculose and tumorous pleural fluid and ascites

    Institute of Scientific and Technical Information of China (English)

    董春富; 朱以军

    2005-01-01

    目的 评价腺苷脱氨酶(ADA)用于结核性与肿瘤性胸腹水诊断的价值.方法 对入选的8篇文献(3篇腹水文献和5篇胸水文献)进行齐性检验、两个均数之差的合并及meta统计分析.结果 腹水标本结核组ADA含量比肿瘤组高1.559 4~6.206 6倍标准差;胸水标本结核组ADA含量比肿瘤组高0.627 3~3.264 7倍标准差,差异均有显著性(P<0.001).结论 ADA检测是鉴别诊断结核性与肿瘤性胸腹水的快速、简便、特异、敏感的方法.

  18. Ada Linear-Algebra Program

    Science.gov (United States)

    Klumpp, A. R.; Lawson, C. L.

    1988-01-01

    Routines provided for common scalar, vector, matrix, and quaternion operations. Computer program extends Ada programming language to include linear-algebra capabilities similar to HAS/S programming language. Designed for such avionics applications as software for Space Station.

  19. Correlation of adenosine deaminase with T lymphocyte subpopulations in patients with tuberculous and cancerous pleuritis%结核性胸膜炎及癌性胸膜炎腺苷脱氨酶活性和T淋巴细胞亚群变化的分析

    Institute of Scientific and Technical Information of China (English)

    艾华; 沈策

    2004-01-01

    目的探讨结核性与癌性胸膜炎胸水中腺苷脱氨酶(ADA)与外周血T淋巴细胞亚群CD4和 CD8百分比的变化及临床意义.方法结核性胸膜炎35例和癌性胸膜炎29例,检测胸水及外周血中ADA并进行比较,其中结核性胸膜炎25例和癌性胸膜炎20例,检测胸水及外周血中CD4和CD8百分比并进行比较.ADA测定根据比色技术应用酶连续反应原理手工检测.T淋巴细胞亚群应用流式细胞仪(FCM)检测.结果结核性胸膜炎胸水中的ADA、CD4百分比均显著高于癌性胸膜炎(P0.05).结核性胸膜炎胸水中的ADA、CD4百分比均明显高于其外周血中的水平(P<0.05).结论 ADA对诊断结核性胸膜炎具有很高的价值.结核性胸膜炎胸水中ADA、CD4百分比均明显增高,ADA与CD4百分比呈一定的正相关性,ADA可能是一个细胞免疫的指标.

  20. Paranoia.Ada: Sample output reports

    Science.gov (United States)

    1986-01-01

    Paranoia.Ada is a program to diagnose floating point arithmetic in the context of the Ada programming language. The program evaluates the quality of a floating point arithmetic implementation with respect to the proposed IEEE Standards P754 and P854. Paranoia.Ada is derived from the original BASIC programming language version of Paranoia. The Paranoia.Ada replicates in Ada the test algorithms originally implemented in BASIC and adheres to the evaluation criteria established by W. M. Kahan. Paranoia.Ada incorporates a major structural redesign and employs applicable Ada architectural and stylistic features.

  1. Diagnostic value of pleural fluid C - reactive protein and ADA in pleural effusion%联合检测CRP、ADA对胸腔积液病因诊断价值的探讨

    Institute of Scientific and Technical Information of China (English)

    常万松; 薛迪中; 焦鹏飞; 赵伟

    2011-01-01

    目的 探讨联合检测胸液C-反应蛋白(CRP)和腺苷脱氨酶(ADA)在诊断类肺炎性胸腔积液、结核性胸腔积液和癌性胸腔积液的价值.方法 回顾性分析诊断明确的18例类肺炎性胸腔积液、28例结核性胸腔积液和42例癌性胸腔积液患者的临床资料,比较三者胸液中CRP及ADA含量的差别.结果 ①胸液CRP水平:类肺炎性胸腔积液(12.38±8.01)mg/dL,显著高于结核性胸液(3.64±1.85)mg/dL和癌性胸液患者(1.43±1.18)mg/dL(P<0.01),结核性胸腔积液患者胸液CRP水平显著高于癌性胸腔积液患者(P<0.05).②胸液ADA水平:类肺炎性胸腔积液患者(47.73±19.11)U/L,与结核性胸腔积液(84.02±55.11)U/L和癌性胸腔积液患者(26.14±12.09)U/L存在显著统计学差异(P=0.00031).③若两项指标联合检测(即胸液CRP>1mg/dL且ADA>40U/L),则诊断结核性胸腔积液的敏感性为92.7%,特异性为97.3%,较单独检测明显提高准确性.结论 胸液CRP和ADA在类肺炎性、结核性和癌性胸腔积液中分别存在明显著统计学差异,可以单独作为检测指标鉴别胸腔积液性质,联合检测胸液CRP、ADA对胸腔积液性质的鉴别诊断意义更大,准确性明显提高,值得在临床上进一步推广.%Objective To investigate the value of C -reactive protein (CRP) and adenosine de-aminase (ADA) in differential diagnosis of purulent pleuritis with tuberculous pleuritis and cancerous pleural effusion. Methods Pleural fluid CRP and ADA levels were obtained in 18 patients with purulent pleuritis,28 patients with tuberculous pleurtits and 42 patients with cancerous pleural effusion. The CRP and ADA levels of three groups were compared. Results The CRP levels of the purulent pleuritis were higher than that of the tuberculous pleuritis and cancerous pleural effusion obviously (P < 0. 01). The CRP levels of the tuberculous pleuritis were exceeded the cancerous pleural effusions obviously (P < 0. 05). The ADA levels of the

  2. The clinical significance of the combined detection of CA125 and ADA in hydrothorax in the diagnosis of tuberculous pleurisy%联合检测胸水糖类抗原125、腺苷脱氨酶在结核性胸膜炎诊断中的意义

    Institute of Scientific and Technical Information of China (English)

    庄亚琴; 高习文; 周杰

    2014-01-01

    Objective:To explore the clinical significance of the joint detection of carbohydrate antigen 125(CA125) and adenosine deaminase( ADA) in hydrothorax in the diagnosis of tuberculous pleurisy. Methods:The levels of CA125 and ADA in hydrothorax of 54 patients with tuberculous pleurisy and 40 patients with malignant pleural effusion were measured using electrochemiluminescence assay. The four tumor markers(including carcino embryonic antigen,CA199,neuron-specific enolase,cylokerain fragments21 -1 were also detected. Results:The concentrations of CA125 and ADA in hydrothorax of tuberculous pleurisy were(702. 67 ± 367. 30) u/ml and (81. 74±18. 82)u/L,respectively,whose were higher than the normal level. The sensitivity of CA125(100. 0%) was higher than that of ADA(88. 9%) in hydrothorax. The positive rates of four tumor markers were low. The sensitivity and specificity of the joint detection of CA125 and ADA could be increased to 88. 9% and 90. 75%,respectively. Conclusions:The measurement of CA125 is beneficial in the diagnosis of tuberculous pleurisy. The combined detection of CA125 and ADA can improve the diagnostic positive rate of tuberculous pleurisy,combined other tumor indexes detection can help to exclude malignant pleural effusion.%目的:探讨胸水糖类抗原125(CA125)、腺苷脱氨酶(ADA)联合检测在结核性胸膜炎诊断中的临床意义。方法:应用电化学发光法测定54例结核性胸膜炎及40例恶性胸腔积液患者胸水CA125、ADA,同时检测胸水中癌胚抗原、CA199、神经特异性烯醇化酶、细胞角质素片段抗原。结果:结核性胸膜炎患者胸水CA125的水平[(702.67依367.30)u/ml]高于正常值,胸水ADA水平[(81.74依18.82)u/L]增高,胸水CA125的灵敏度(100.0%)高于胸水ADA(88.9%)。其余4项肿瘤指标阳性率低。胸水CA125联合ADA检测有较高的灵敏度(88.9%)及特异度(90.75%)。结论:胸水CA125测定对结核性胸膜炎的诊断具有临床价值,CA125

  3. Ada Implementation Guide. Software Engineering With Ada. Volume 1

    Science.gov (United States)

    1994-04-01

    teaching, the student is less likely to readily adopt new, more powerful ways of accomplishing old tasks 122 Depatn of the NaY I ! Trablng and Educaion and...Maturity Model3 (CMU/SEI-92-TR-25, ESC-TR-/92-0M5). Pittsburgh, PA : Carnegie-Mellon University, 1992. SBoehm. B.W. Software Engineering Economics...Pittsburgh, PA : Carnegie-Mellon University, 19-21 March 1991. £ Contrast: Ada 9X and C++, Schonberg, E. New York University, 1992 (Distributed by Ada IC on

  4. Separation of effects of adenosine on energy metabolism from those on cyclic AMP in rat thymic lymphocytes

    Energy Technology Data Exchange (ETDEWEB)

    Nordeen, S.K.; Young, D.A.

    1977-08-10

    In rat thymic lymphocytes incubated for 2 h without exogenous energy-providing substrate, adenosine may be substituted for glucose as a means of maximally restoring energy metabolism and those cellular functions whose rates are sensitive to small changes in the energy balance, such as protein synthesis and uridine utilization for RNA synthesis. Since effects of adenosine in thymocytes and other cells have frequently been attributed to changes in cyclic AMP, this report investigates its possible involvement in these glucose-like restorative actions of adenosine. Although the same range of doses of adenosine effective at raising cyclic AMP also elicit roughly parallel stimulations of protein synthesis and uridine utilization, further results dissociate the restorative actions from those on cyclic AMP. (a) Other purine nucleosides mimic the glucose-like actions of adenosine without increasing cyclic AMP; (b) conversely, prostaglandin E/sub 1/ mimics the cyclic AMP response without restoring energy metabolism or energy-dependent functions; and (c) potentiation of the cyclic AMP response, either by inhibiting phosphodiesterase or adenosine deaminase, does not enhance the restorative response to a range of doses of adenosine. Finally, cyclic AMP-mediated glycogenolysis cannot account for the glucose-like effects since addition of adenosine increases, not decreases, levels of glycogen.

  5. Adenosine receptor neurobiology: overview.

    Science.gov (United States)

    Chen, Jiang-Fan; Lee, Chien-fei; Chern, Yijuang

    2014-01-01

    Adenosine is a naturally occurring nucleoside that is distributed ubiquitously throughout the body as a metabolic intermediary. In the brain, adenosine functions as an important upstream neuromodulator of a broad spectrum of neurotransmitters, receptors, and signaling pathways. By acting through four G-protein-coupled receptors, adenosine contributes critically to homeostasis and neuromodulatory control of a variety of normal and abnormal brain functions, ranging from synaptic plasticity, to cognition, to sleep, to motor activity to neuroinflammation, and cell death. This review begun with an overview of the gene and genome structure and the expression pattern of adenosine receptors (ARs). We feature several new developments over the past decade in our understanding of AR functions in the brain, with special focus on the identification and characterization of canonical and noncanonical signaling pathways of ARs. We provide an update on functional insights from complementary genetic-knockout and pharmacological studies on the AR control of various brain functions. We also highlight several novel and recent developments of AR neurobiology, including (i) recent breakthrough in high resolution of three-dimension structure of adenosine A2A receptors (A2ARs) in several functional status, (ii) receptor-receptor heterodimerization, (iii) AR function in glial cells, and (iv) the druggability of AR. We concluded the review with the contention that these new developments extend and strengthen the support for A1 and A2ARs in brain as therapeutic targets for neurologic and psychiatric diseases.

  6. Ada Compiler Validation Summary Report: ROLM Ada Compiler, Version 4.42 V-002.

    Science.gov (United States)

    1983-05-12

    EC =3 CB3003A-B.ADA P SC =64 CB3004A.ADA P SCz 52 BB3005A.ADA P SC= 4 EC z2 CB4001A..ADA P SC 60 C84002A.ADA P SCx 50 C34003A-AB.AOA P SC =35...a class B test is indicated by EC. The results for each test file were as follows: B22001A.TST PS SC : 26 EC s 8 B22001B.TST PS SCx 8 EC- 3...A29002F-B.ADA P -Sc z1Il A29002G-B.ADA P SC z88 A29002I-.B.ADA P SC = 63 A29002I-8B.ADA P SC= 95 A29002J-B.ADA P SC 81 D29002K-B.ADA P SCz 766 *B32103A

  7. Report on Teaching Ada. Revised

    Science.gov (United States)

    1980-12-01

    their list of -• questionable iters. Then, with no assistance they were given the followina quiz. Teaching Ada Faae 41 Answer the tollowinq cuestions ...It any rertain to any ot the Items you nave marked as not understandatle, mark tPat UI cuestion "deleted," You have 20 minutes. The oulz is open book

  8. Adenosine and sleep

    Energy Technology Data Exchange (ETDEWEB)

    Yanik, G.M. Jr.

    1987-01-01

    Behavioral and biochemical approaches have been used to determine the relative contribution of endogenous adenosine and adenosine receptors to the sleep-wake cycle in the rat. Adenosine concentrations in specific areas of the rat brain were not affected by 24 hours of total sleep deprivation, or by 24 or 48 hours of REM sleep deprivation. In order to assess the effect of REM sleep deprivation on adenosine A/sub 1/ receptors, /sup 3/H-L-PIA binding was measured. The Bmax values for /sup 3/H-L-PIA binding to membrane preparations of the cortices and corpus striata from 48 hour REM sleep-deprived animals were increased 14.8% and 23%, respectively. These increases were not maintained following the cessation of sleep deprivation and recovered within 2 hours. The results of a 96 hour REM deprivation experiment were similar to those of the 48 hour REM sleep deprivation experiment. However, these increases were not evident in similar structures taken from stress control animals, and conclusively demonstrated that the changes in /sup 3/H-L-PIA binding resulted from REM sleep deprivation and not from stress.

  9. Effect of insulin and glucose on adenosine metabolizing enzymes in human B lymphocytes.

    Science.gov (United States)

    Kocbuch, Katarzyna; Sakowicz-Burkiewicz, Monika; Grden, Marzena; Szutowicz, Andrzej; Pawelczyk, Tadeusz

    2009-01-01

    In diabetes several aspects of immunity are altered, including the immunomodulatory action of adenosine. Our study was undertaken to investigate the effect of different glucose and insulin concentrations on activities of adenosine metabolizing enzymes in human B lymphocytes line SKW 6.4. The activity of adenosine deaminase in the cytosolic fraction was very low and was not affected by different glucose concentration, but in the membrane fraction of cells cultured with 25 mM glucose it was decreased by about 35% comparing to the activity in cells maintained in 5 mM glucose, irrespective of insulin concentration. The activities of 5'-nucleotidase (5'-NT) and ecto-5'-NT in SKW 6.4 cells depended on insulin concentration, but not on glucose. Cells cultured with 10(-8) M insulin displayed an about 60% lower activity of cytosolic 5'-NT comparing to cells maintained at 10(-11) M insulin. The activity of ecto-5'-NT was decreased by about 70% in cells cultured with 10(-8) M insulin comparing to cells grown in 10(-11) M insulin. Neither insulin nor glucose had an effect on adenosine kinase (AK) activity in SKW 6.4 cells or in human B cells isolated from peripheral blood. The extracellular level of adenosine and inosine during accelerated catabolism of cellular ATP depended on glucose, but not on insulin concentration. Concluding, our study demonstrates that glucose and insulin differentially affect the activities of adenosine metabolizing enzymes in human B lymphocytes, but changes in those activities do not correlate with the adenosine level in cell media during accelerated ATP catabolism, implying that nucleoside transport is the primary factor determining the extracellular level of adenosine.

  10. Disease: H00092 [KEGG MEDICUS

    Lifescience Database Archive (English)

    Full Text Available ferentiation, along with direct or indirect impairment of B-cell development and function. Adenosine deaminase (ADA) deficiency accou...nts for about half of the autosomal recessive forms of S

  11. Pleural effusion: Role of pleural fluid cytology, adenosine deaminase level, and pleural biopsy in diagnosis

    Directory of Open Access Journals (Sweden)

    Biswajit Biswas

    2016-01-01

    Full Text Available Objective: The present study is designed to evaluate the role of pleural fluid analysis in diagnosing pleural diseases and to study the advantages and disadvantages of thoracocentasis and pleural biopsy. Materials and Methods: We prospectively included 66 consecutive indoor patients over a duration of 1 year. Pleural fluid was collected and cytological smears were made from the fluid. Plural biopsy was done in the same patient by Cope needle. Adequate pleural biopsy tissue yielding specific diagnosis was obtained in 47 (71.2% cases. Results: Tuberculosis was the commonest nonneoplastic lesion followed by chronic nonspecific pleuritis comprising 60% and 33.3% of the nonneoplastic cases respectively and tuberculosis was predominantly diagnosed in the younger age group. Majority (70.8% of malignancy cases were in the age group of >50-70. Adenocarcinoma was found to be the commonest (66.7% malignant neoplasm in the pleurae followed by small-cell carcinoma (20.8%. Conclusion: Pleural biopsy is a useful and minimally invasive procedure. It is more sensitive and specific than pleural fluid smears.

  12. Differential diagnostic value of pleural effusion combined with serum ADA and CEA for tubercu lous and malignant pleural exudates%胸水和血清ADA、CEA联合检测对结核性和恶性胸腔积液的诊断价值

    Institute of Scientific and Technical Information of China (English)

    陈辉; 庞华春

    2009-01-01

    Objective To study the diagnostic value of pleural effusion combined with serum adenosine deaminase(ADA),carcinoemhryonic antigen(CEA)in testing tuberculous and malignant pleural exudates.Methods Diagnostic kit for carcinoe mbryonic antigen(CEA)and ADA measured by ELISA and Enzyme continuotrs monitoring method was examined among 91 patients with pleural exudates.Results The ADA activity of tuberculous and malignant exudates were respectively(42.32±17.56)U/L and(10.29 4-6.34)U/L(P<0.01).If the critical value of ADA was larger than 40U/L in tuberculous diagnosis,its sensitivity Was 82.5%and the specificity was92.2%as the critical value of ADA mole than 40U/L.its sensitivity was 92.5%and the specificity Wag 90.2%as the critical value of PADA/SADA more than 1.The CEA activity of tuberculous and malignant exudates were respectively(8.314±3.62)ug/L and (24.7±1 3.6)ug/L(PADA and CEA of pleural exudates is of great diagnostic value in patients with tubeleulous and malignant pleural effusion.%目的 探讨胸水和血清腺苷脱氨酶(ADA)、癌胚抗原(CEA)联合检测对结核性和恶性胸腔积液的诊断价值.方法 采用酶连续监测法和酶联免疫(ELISA)双抗体夹心法对91例胸腔积液进行胸水和血清ADA和CEA检测分析.结果 ADA活性在结核性和恶性胸腔积液中分别为(42.32±17.56)U/L和(10.29±6.34)U/L(P<0.01).以PADA>40U/L做为诊断结核的临界值,其灵敏性为82.5%,特异性为92.2%;以PADA/SADA>1为临界值,其灵敏性为92.5%,特异性为90.2%.CEA活性在结核性和恶性胸腔积液中分别为(8.31±3.62) μg/L和(24.7±13.6) μg/L(P<0.01).以PCEA>20μg/L做为诊断恶性胸腔积液

  13. The effects of N-acylhomoserine lactones, β-lactam antibiotics and adenosine on biofilm formation in the multi-β-lactam antibiotic-resistant bacterium Acidovorax sp. strain MR-S7.

    Science.gov (United States)

    Kusada, Hiroyuki; Hanada, Satoshi; Kamagata, Yoichi; Kimura, Nobutada

    2014-07-01

    Bacteria in the natural ecosystem frequently live as adherent communities called biofilms. Some chemical compounds are known to affect biofilm formation. We investigated the effect of exogenous small molecules, N-acylhomoserine lactones (AHLs), β-lactam antibiotics, and adenosine, on biofilm formation in the β-lactam antibiotic-resistant bacterium Acidovorax sp. strain MR-S7. Biofilm formation was induced by the addition of various types of AHL isomers and β-lactam antibiotics, whereas the addition of adenosine strongly interfered with the biofilm formation. A gene (macP) encoding adenosine deaminase (that converts adenosine to inosine controlling intracellular adenosine concentration) was successfully cloned from MR-S7 genome and heterologously expressed in Escherichia coli. The purified MacP protein clearly catalyzed the deamination of adenosine to produce inosine. A transcriptional analysis revealed that biofilm-inducing molecules, an AHL and a β-lactam antibiotic, strongly induced not only biofilm formation but also adenosine deaminase gene expression, suggesting that an elaborate gene regulation network for biofilm formation is present in the β-lactam antibiotic-resistant bacterium studied here.

  14. Adenosine improves cardiomyocyte respiratory efficiency.

    Science.gov (United States)

    Babsky, A M; Doliba, M M; Doliba, N M; Osbakken, M D

    1998-01-01

    The role of adenosine on the regulation of mitochondrial function has been studied. In order to evaluate this the following experiments were done in isolated rat cardiomyocites and mitochondria using polarographic techniques. Cardiomyocyte oxygen consumption (MVO2) and mitochondrial respiratory function (State 3 and State 4, respiratory control index, and ADP/O ratio) were evaluated after exposure to adenosine. Cardiomyocyte MVO2 was significantly lower in cells previously exposed to adenosine (10 microM, 15 min or 30 min cell incubation) than in cells not exposed to adenosine (control). Addition of dipyridamole (10 microM) or 8-(p-Sulfophenyl) theophylline (50 microM) to cardiomyocytes before adenosine incubation prevented the adenosine-induced changes in MVO2. Mitochondria obtained from isolated perfused beating heart previously perfused with adenosine (10 microM, 30 min heart perfusion) also resulted in significant increases in ADP/O and respiratory control index compared to matching control. Mitochondria isolated from cardiomyocytes previously exposed to adenosine (10 microM, 15 min or 30 min cell incubation) resulted in a significant increase in mitochondrial ADP/O ratio compared to control. Adenosine-induced decrease in cardiomyocyte MVO2 may be related to an increase in efficiency of mitochondrial oxidative phosphorylation, and more economical use of oxygen, which is necessary for survival under ischemic stress.

  15. Ada training evaluation and recommendations from the Gamma Ray Observatory Ada Development Team

    Science.gov (United States)

    1985-01-01

    The Ada training experiences of the Gamma Ray Observatory Ada development team are related, and recommendations are made concerning future Ada training for software developers. Training methods are evaluated, deficiencies in the training program are noted, and a recommended approach, including course outline, time allocation, and reference materials, is offered.

  16. The detection significance of CD64,Cys-C and ADA levels in cerebrospinal fluid of patients with tuberculous meningitis%结核性脑膜炎患者脑脊液 CD64 Cys-C 及 ADA 水平的检测意义

    Institute of Scientific and Technical Information of China (English)

    钟晶; 尚鹏程; 吴张君; 朱玛; 毕雷; 李由平; 李青峰

    2015-01-01

    目的:分析结核性脑膜炎患者脑脊液中性粒细胞表面膜糖蛋白(CD64)、血清胱抑素C(Cys‐C)及腺苷脱氨酶(ADA )水平的检测意义。方法选取我院193例住院患者为对象,结核性脑膜炎102例,化脓性脑膜炎35例,病毒性脑膜炎30例,非感染性神经系统疾病26例,免疫透射比浊法检测4组Cys‐C、流式细胞术检测CD64、酶标法检测ADA ,比较4组CD64、Cys‐C及ADA水平,并比较单一指标检测与联合检查结核性脑膜炎的诊断符合率。结果结核性脑膜炎患者Cys‐C、ADA、CD64均显著高于非感染性神经系统疾病患者(P<0.05),结核性脑膜炎组、化脓性脑膜炎组、病毒性脑膜炎组3项指标呈递减趋势,病毒性脑膜炎与非感染性神经系统疾病组CD64、Cys‐C比较差异无统计学意义(P>0.05),结核性脑膜炎组与化脓性脑膜炎组Cys‐C比较差异无统计学意义(P>0.05),其他组间比较差异均有统计学意义(P<0.05);Cys‐C、ADA、CD64诊断符合率分别为78.43%、60.73%、70.59%,联合诊断符合率98.04%,显著高于单一诊断。结论 CD64、Cys‐C及 ADA均为结核性脑膜炎的有效检测指标,联合检查有助于提高结核性脑膜炎的诊断准确率及与其他类型脑膜炎的鉴别,具有较高的临床应用价值。%Objective To study the detection significance of neutral granulocyte surface film glycoprotein (CD64) ,serum cystatin C (Cys‐C ) and adenosine deaminase (ADA ) levels in cerebrospinal fluid of patients with tuberculous meningi‐tis.Methods 193 cases of patients admitted to our hospital were selected as subjects ,among whom 102 cases of tuberculous meningitis ,35 cases of purulent meningitis and 30 cases of viral meningitis ,and 26 cases of non‐infectious neurological disea‐ses. Cys‐C levels of the four groups were detected by immunoturbidimetry ,CD64 by flow cytometry and ADA by enzyme

  17. Paranoia.Ada: A diagnostic program to evaluate Ada floating-point arithmetic

    Science.gov (United States)

    Hjermstad, Chris

    1986-01-01

    Many essential software functions in the mission critical computer resource application domain depend on floating point arithmetic. Numerically intensive functions associated with the Space Station project, such as emphemeris generation or the implementation of Kalman filters, are likely to employ the floating point facilities of Ada. Paranoia.Ada appears to be a valuabe program to insure that Ada environments and their underlying hardware exhibit the precision and correctness required to satisfy mission computational requirements. As a diagnostic tool, Paranoia.Ada reveals many essential characteristics of an Ada floating point implementation. Equipped with such knowledge, programmers need not tremble before the complex task of floating point computation.

  18. A small evaluation suite for Ada compilers

    Science.gov (United States)

    Wilke, Randy; Roy, Daniel M.

    1986-01-01

    After completing a small Ada pilot project (OCC simulator) for the Multi Satellite Operations Control Center (MSOCC) at Goddard last year, the use of Ada to develop OCCs was recommended. To help MSOCC transition toward Ada, a suite of about 100 evaluation programs was developed which can be used to assess Ada compilers. These programs compare the overall quality of the compilation system, compare the relative efficiencies of the compilers and the environments in which they work, and compare the size and execution speed of generated machine code. Another goal of the benchmark software was to provide MSOCC system developers with rough timing estimates for the purpose of predicting performance of future systems written in Ada.

  19. The catalase activity of diiron adenine deaminase

    Energy Technology Data Exchange (ETDEWEB)

    Kamat S. S.; Swaminathan S.; Holmes-Hampton, G. P.; Bagaria, A.; Kumaran, D.; Tichy, S. E.; Gheyi, T.; Zheng, X.; Bain, K.; Groshong, C.; Emtage, S.; Sauder, J. M.; Burley, S. K.; Lindahl, P. A.; Raushel, F. M.

    2011-12-01

    Adenine deaminase (ADE) from the amidohydrolase superfamily (AHS) of enzymes catalyzes the conversion of adenine to hypoxanthine and ammonia. Enzyme isolated from Escherichia coli was largely inactive toward the deamination of adenine. Molecular weight determinations by mass spectrometry provided evidence that multiple histidine and methionine residues were oxygenated. When iron was sequestered with a metal chelator and the growth medium supplemented with Mn{sup 2+} before induction, the post-translational modifications disappeared. Enzyme expressed and purified under these conditions was substantially more active for adenine deamination. Apo-enzyme was prepared and reconstituted with two equivalents of FeSO{sub 4}. Inductively coupled plasma mass spectrometry and Moessbauer spectroscopy demonstrated that this protein contained two high-spin ferrous ions per monomer of ADE. In addition to the adenine deaminase activity, [Fe{sup II}/Fe{sup II}]-ADE catalyzed the conversion of H{sub 2}O{sub 2} to O{sub 2} and H{sub 2}O. The values of k{sub cat} and k{sub cat}/K{sub m} for the catalase activity are 200 s{sup -1} and 2.4 x 10{sup 4} M{sup -1} s{sup -1}, respectively. [Fe{sup II}/Fe{sup II}]-ADE underwent more than 100 turnovers with H{sub 2}O{sub 2} before the enzyme was inactivated due to oxygenation of histidine residues critical for metal binding. The iron in the inactive enzyme was high-spin ferric with g{sub ave} = 4.3 EPR signal and no evidence of anti-ferromagnetic spin-coupling. A model is proposed for the disproportionation of H{sub 2}O{sub 2} by [Fe{sup II}/Fe{sup II}]-ADE that involves the cycling of the binuclear metal center between the di-ferric and di-ferrous oxidation states. Oxygenation of active site residues occurs via release of hydroxyl radicals. These findings represent the first report of redox reaction catalysis by any member of the AHS.

  20. Imaging Adenosine Triphosphate (ATP).

    Science.gov (United States)

    Rajendran, Megha; Dane, Eric; Conley, Jason; Tantama, Mathew

    2016-08-01

    Adenosine triphosphate (ATP) is a universal mediator of metabolism and signaling across unicellular and multicellular species. There is a fundamental interdependence between the dynamics of ATP and the physiology that occurs inside and outside the cell. Characterizing and understanding ATP dynamics provide valuable mechanistic insight into processes that range from neurotransmission to the chemotaxis of immune cells. Therefore, we require the methodology to interrogate both temporal and spatial components of ATP dynamics from the subcellular to the organismal levels in live specimens. Over the last several decades, a number of molecular probes that are specific to ATP have been developed. These probes have been combined with imaging approaches, particularly optical microscopy, to enable qualitative and quantitative detection of this critical molecule. In this review, we survey current examples of technologies available for visualizing ATP in living cells, and identify areas where new tools and approaches are needed to expand our capabilities.

  1. Day-night variations of adenosine and its metabolizing enzymes in the brain cortex of the rat--possible physiological significance for the energetic homeostasis and the sleep-wake cycle.

    Science.gov (United States)

    Chagoya de Sánchez, V; Hernández Múñoz, R; Suárez, J; Vidrio, S; Yáñez, L; Díaz Múñoz, M

    1993-05-28

    The role of adenosine as a metabolic regulator of physiological processes in the brain was studied by measuring its concentrations and the activity of adenosine-metabolizing enzymes: 5'-nucleotidase, S-adenosylhomocysteine hydrolase, adenosine deaminase and adenosine kinase in the cerebral cortex of the rat. Other purine compounds, such as, inosine, hypoxanthine and adenine nucleotides were also studied. The purines' pattern was bimodal with high levels of adenosine, inosine and hypoxanthine during the light period reaching their peak at 12.00 h, 08.00 h and 16.00 h, respectively, and small increments during the night between 02.00 h and 04.00 h. The enzymatic activities showed, in general, an unimodal profile with low activity during the day and high activities at night. The adenine nucleotide profile showed a significant diminution between 12.00 h and 24.00 h. The high adenosine level during the day might be due to a diminution of adenine nucleotide and to the low activity of adenosine-metabolizing enzymes, suggesting an accumulation of the nucleoside. The night increase, although of less magnitude, is simultaneous to high activity of adenosine-metabolizing enzymes and could be due to an increased formation of the nucleoside. The present data and the findings from other authors strongly suggest that adenosine in the brain cortex of the rat can participate at least in two physiological processes: regulation of the sleep-wake cycle and replenishment of the adenine nucleotide pool.

  2. Twenty-four-hour changes of S-adenosylmethionine, S-adenosylhomocysteine adenosine and their metabolizing enzymes in rat liver; possible physiological significance in phospholipid methylation.

    Science.gov (United States)

    Chagoya de Sánchez, V; Hernández-Muñoz, R; Sánchez, L; Vidrio, S; Yáñez, L; Suárez, J

    1991-01-01

    1. The metabolic control of adenosine concentration in the rat liver through the 24-hr cycle is related to the activity of adenosine-metabolizing enzymes [5'-nucleotidase (5'N), adenosine deaminase (A.D.), adenosine kinase (A.K.) and S-adenosylhomocysteine hydrolase (SAH-H)]. 2. Two peaks of adenosine were observed, one at 12:00 hr caused by high activity of 5'N and SAH-H, and the other at 02:00 hr, caused by a decrease in purine catabolism and purine utilization, low activity of SAH-H and de novo purine formation. 3. The similarity of the adenosine and S-adenosylmethionine (SAM) profiles through the 24-hr cycle suggests a role of adenosine in transmethylation reactions, because, during the night (02:00 hr), the metabolic conditions favor the formation and accumulation of S-adenosylhomocysteine (SAH), with consequent inhibition of transmethylation reactions. 4. In the 24-hr variation of phosphatidylcholine (PC) and phosphatidylethanolamine (PE), the lowest ratio of PC/PE was observed at 24:00-02:00 hr when SAH concentration is high, whereas the highest PC/PE ratio occurs at the same time as one of the SAM/SAH ratio maxima.

  3. Some neural effects of adenosin.

    Science.gov (United States)

    Haulică, I; Brănişteanu, D D; Petrescu, G H

    1978-01-01

    The possible neural effects of adenosine were investigated by using electrophysiological techniques at the level of some central and peripheral synapses. The evoked potentials in the somatosensorial cerebral cortex are influenced according to both the type of administration and the level of the electrical stimulation. While the local application does not induce significant alterations, the intrathalamic injections and the perfusion of the IIIrd cerebral ventricle do change the distribution of activated units at the level of different cortical layers especially during the peripheral stimulation. The frequency of spontaneous miniature discharges intracellularly recorded in the neuromuscular junction (mepp) is significantly depressed by adenosine. This effect is calcium- and dose-dependent. The end plate potentials (EPP) were also depressed. The statistical binomial analysis of the phenomenon indicated that adenosine induces a decrease if the presynaptic pool of the available transmitter. The data obtained demonstrate a presynaptic inhibitory action of adenosine beside its known vascular and metaholic effects.

  4. Experiences with Ada in an embedded system

    Science.gov (United States)

    Labaugh, Robert J.

    1988-01-01

    Recent experiences with using Ada in a real time environment are described. The application was the control system for an experimental robotic arm. The objectives of the effort were to experiment with developing embedded applications in Ada, evaluating the suitability of the language for the application, and determining the performance of the system. Additional objectives were to develop a control system based on the NASA/NBS Standard Reference Model for Telerobot Control System Architecture (NASREM) in Ada, and to experiment with the control laws and how to incorporate them into the NASREM architecture.

  5. Unique properties of Plasmodium falciparum porphobilinogen deaminase.

    Science.gov (United States)

    Nagaraj, Viswanathan Arun; Arumugam, Rajavel; Gopalakrishnan, Bulusu; Jyothsna, Yeleswarapu Sri; Rangarajan, Pundi N; Padmanaban, Govindarajan

    2008-01-04

    The hybrid pathway for heme biosynthesis in the malarial parasite proposes the involvement of parasite genome-coded enzymes of the pathway localized in different compartments such as apicoplast, mitochondria, and cytosol. However, knowledge on the functionality and localization of many of these enzymes is not available. In this study, we demonstrate that porphobilinogen deaminase encoded by the Plasmodium falciparum genome (PfPBGD) has several unique biochemical properties. Studies carried out with PfPBGD partially purified from parasite membrane fraction, as well as recombinant PfPBGD lacking N-terminal 64 amino acids expressed and purified from Escherichia coli cells (DeltaPfPBGD), indicate that both the proteins are catalytically active. Surprisingly, PfPBGD catalyzes the conversion of porphobilinogen to uroporphyrinogen III (UROGEN III), indicating that it also possesses uroporphyrinogen III synthase (UROS) activity, catalyzing the next step. This obviates the necessity to have a separate gene for UROS that has not been so far annotated in the parasite genome. Interestingly, DeltaPfP-BGD gives rise to UROGEN III even after heat treatment, although UROS from other sources is known to be heat-sensitive. Based on the analysis of active site residues, a DeltaPfPBGDL116K mutant enzyme was created and the specific activity of this recombinant mutant enzyme is 5-fold higher than DeltaPfPBGD. More interestingly, DeltaPfPBGDL116K catalyzes the formation of uroporphyrinogen I (UROGEN I) in addition to UROGEN III, indicating that with increased PBGD activity the UROS activity of PBGD may perhaps become rate-limiting, thus leading to non-enzymatic cyclization of preuroporphyrinogen to UROGEN I. PfPBGD is localized to the apicoplast and is catalytically very inefficient compared with the host red cell enzyme.

  6. Ada Compiler Validation Summary Report: Western Digital STC-Ada Compiler, Version C1. Om V-004.

    Science.gov (United States)

    1983-07-28

    C27001A.ADA P SC 2 10 C27002A-B.ADA P SC x 15 829001A.ADA PS SC a 126 EC 262 A29002A-B.ADA P SCz 74 A29002B-.B.ADA P SC a 69 A29002C-B. ADA P SC z 68...s 15 D32202Bm-B.ADA P SC a 21 SC 2 9 B32202C-D.ADA P SC.x 28 EC x:12 C32203A-B.ADA P SC a 15 *A32203i68.ADA P SC a 22 A32203C-B.ADA P SCx 18 A32203D...B.ADA P SC a 16 B33001A.ADA P SC a 27 SC a 10 833002A.ADA PS SC a 8 EC x 5 533003A.ADA P SCx 14 EC a 4 B33003B-AS.ADA P SC a 22 EC a 9 533003C-AB.ADA

  7. AMP deaminase histochemical activity and immunofluorescent isozyme localization in rat skeletal muscle

    Science.gov (United States)

    Thompson, J. L.; Sabina, R. L.; Ogasawara, N.; Riley, D. A.

    1992-01-01

    The cellular distribution of AMP deaminase (AMPda) isozymes was documented for rat soleus and plantaris muscles, utilizing immunofluorescence microscopy and immunoprecipitation methods. AMPda is a ubiquitous enzyme existing as three distinct isozymes, A, B and C, which were initially purified from skeletal muscle, liver (and kidney), and heart, respectively. AMPda-A is primarily concentrated subsarcolemmally and intermyofibrillarly within muscle cells, while isozymes B and C are concentrated within non-myofiber elements of muscle tissue. AMPda-B is principally associated with connective tissues surrounding neural elements and the muscle spindle capsule, and AMPda-C is predominantly associated with circulatory elements, such as arterial and venous walls, capillary endothelium, and red blood cells. These specific localizations, combined with documented differences in kinetic properties, suggest multiple functional roles for the AMPda isozymes or temporal segregation of similar AMPda functions. Linkage of the AMPda substrate with adenosine production pathways at the AMP level and the localization of isozyme-C in vascular tissue suggest a regulatory role in the microcirculation.

  8. Ada (Trade Name) Bibliography. Volume 1.

    Science.gov (United States)

    1983-05-01

    FISHER, DR. DAVID A.; WETHERALL, PHILIP R. DOCUMENT NUMBER: 3435 DOCUMENT DATE: 01/78 TYPE: TECHNICAL REPORT This report discusses the considerations...SPONOR ADA JT. PROG. OFF., ARLINGTON, VA 22209 - DATABASE PORTABILITY ISSUES IN THE KAPSE KOTLER , REED S. DOCUMENT NUMBER: 3590 TYPE: PAPER KERNEL ADA...N,., BABEL, PHILIPS ., U.S.A.F. ASD,WRIGHT-PATTERSON AFB, OH 5653 -03 JOINT-SERVICE ACQUISITION MANAGEMENT INITIATIVES € BABICH, WAYNEA., SOFTECHINC

  9. ADA and C++ Business Case Analysis

    Science.gov (United States)

    1991-07-01

    compilation times, execution times, and various measures of space requirements. The as- sessments in the comparative analysis were refined using a Delphi ...weighted scoring and tables of results, to the group as a whole. Then a Delphi technique similar to the FAA methodology was used to refine the evaluations...promoter of reusability, or injector of added quality, then our3collective judgements may be biased too much towards Ada. Of course the next Ada 9X team

  10. A W-Grammar Description for ADA.

    Science.gov (United States)

    1986-12-01

    Language Reference Manual. In MT opinion, the W- gramars fall short of this goal since they are less readable than BNF for determining Ada’s syntax, and...37 Summary . . . . . . . . . . . . . . .... . 39 V. Conclusion .. . . . . . . . . . .. . . .* . . . . 40 Ada Constructs Not Covered in W- gramar B...library unit. The problem with the Language Reference Manual description is not that BNF is too antiquated for language definition, but that English

  11. An Embedded Rule-Based Diagnostic Expert System in Ada

    Science.gov (United States)

    Jones, Robert E.; Liberman, Eugene M.

    1992-01-01

    Ada is becoming an increasingly popular programming language for large Government-funded software projects. Ada with it portability, transportability, and maintainability lends itself well to today's complex programming environment. In addition, expert systems have also assumed a growing role in providing human-like reasoning capability expertise for computer systems. The integration is discussed of expert system technology with Ada programming language, especially a rule-based expert system using an ART-Ada (Automated Reasoning Tool for Ada) system shell. NASA Lewis was chosen as a beta test site for ART-Ada. The test was conducted by implementing the existing Autonomous Power EXpert System (APEX), a Lisp-based power expert system, in ART-Ada. Three components, the rule-based expert systems, a graphics user interface, and communications software make up SMART-Ada (Systems fault Management with ART-Ada). The rules were written in the ART-Ada development environment and converted to Ada source code. The graphics interface was developed with the Transportable Application Environment (TAE) Plus, which generates Ada source code to control graphics images. SMART-Ada communicates with a remote host to obtain either simulated or real data. The Ada source code generated with ART-Ada, TAE Plus, and communications code was incorporated into an Ada expert system that reads the data from a power distribution test bed, applies the rule to determine a fault, if one exists, and graphically displays it on the screen. The main objective, to conduct a beta test on the ART-Ada rule-based expert system shell, was achieved. The system is operational. New Ada tools will assist in future successful projects. ART-Ada is one such tool and is a viable alternative to the straight Ada code when an application requires a rule-based or knowledge-based approach.

  12. Transformation of ADA programs into silicon

    Science.gov (United States)

    Organick, E. I.; Lindstrom, G.; Smith, D. K.; Subrahmany; Carter, T.

    1982-03-01

    This report outlines the beginning steps taken in an integrated research effort toward the development of a methodology, and supporting systems, for transforming Ada programs, or program units, (directly) into corresponding VLSI systems. The time seems right to expect good results. The need is evident; special purpose systems should be realistic alternatives where simplicity, speed, reliability, and security ae dominant factors. Success in this research can lead to attractive options for embedded system applications. Ada programs can be regarded as ensembles of machines, one per program unit (module), which in turn may be mapped directly into corresponding VLSI structures on one or more chips with interconnecting (packet switched or other) communication nets. The research reported here is part of a five-year plan, the first year of which focuses on 'proving' the concepts through a realistic demonstration of methodology for a specific example Ada program (a silicon representation of part or all of the DoD Standard Internet Protocol, IP, initially expressed in Ada). Implicit in these objectives is the development of a set of hardware structuring paradigms (rewrite rules) whose application can ensure that transformation steps between levels of abstraction in the design process are well structured in order to preserve the integrity and, where possible, the clarity of the original Ada specification. Some paradigms, but of course not all, lead to highly efficient implementations.

  13. A database management capability for Ada

    Science.gov (United States)

    Chan, Arvola; Danberg, SY; Fox, Stephen; Landers, Terry; Nori, Anil; Smith, John M.

    1986-01-01

    The data requirements of mission critical defense systems have been increasing dramatically. Command and control, intelligence, logistics, and even weapons systems are being required to integrate, process, and share ever increasing volumes of information. To meet this need, systems are now being specified that incorporate data base management subsystems for handling storage and retrieval of information. It is expected that a large number of the next generation of mission critical systems will contain embedded data base management systems. Since the use of Ada has been mandated for most of these systems, it is important to address the issues of providing data base management capabilities that can be closely coupled with Ada. A comprehensive distributed data base management project has been investigated. The key deliverables of this project are three closely related prototype systems implemented in Ada. These three systems are discussed.

  14. Object-Oriented Database Access from Ada

    Science.gov (United States)

    1993-03-01

    programs’ sizes in Ada are larger than C’s. Strong type checking and the interface programs added overhead can probably explain this. 4.3 Problema ...Verdix Corporation. Verdix Ada Development System, 1991. BIB-2 Vita Lt Col Li Chou (ROCAF, Taiwan ) was born on 28 October 1957 in I-Lan, Taiwan ...Republic of China . He graduated from high school in I-Lan in June, 1975. He then entered the National Defense Medical Center from which he graduated in 1980

  15. Program Office Guide to Ada. Edition 1

    Science.gov (United States)

    1986-09-17

    Storage Allocation 3-11 3.2.2.4 Rendezvous 3-11 3.3 ALTERNATIVES IN CUSTOM RUN-TIME SUPPORT 3-12 ENVIRONMENTS ( RSE ) 3.3.1 Unique RSE for Each...Tailoring Run-time Support Environments ( RSE ) The minimal Ada compilation system must include a Run- time Support Environment ( RSE ). The code generated by...a typical Ada compiler calls on the RSE to obtain the run-time system services necessary for execution. The RSE consists of primitive and system

  16. Sickle cell anemia induces changes in peripheral lymphocytes E-NTPDase/E-ADA activities and cytokines secretion in patients under treatment.

    Science.gov (United States)

    Castilhos, Lívia G; Doleski, Pedro H; Bertoldo, Tatiana M D; Passos, Daniela F; Bertoncheli, Claudia de M; Rezer, João F P; Schlemmer, Josiane B; Leal, Daniela B R

    2015-07-01

    Sickle cell anemia (SCA) is characterized by hemoglobin polymerization that results in sickle-shaped red blood cells. The vascular obstruction by sickle erythrocytes is often inflammatory, and purinergic system ecto-enzymes play an important role in modulating the inflammatory and immune response. This study aimed to evaluate the E-NTPDase and E-ADA activities in lymphocytes of SCA treated patients, as well as verify the cytokine profile in this population. Fifteen SCA treated patients and 30 health subjects (control group) were selected. The peripheral lymphocytes were isolated and E-NTPDase and E-ADA activities were determined. Serum was separated from clot formation for the cytokines quantification. E-NTPDase (ATP and ADP as substrate) and E-ADA (adenosine as substrate) activities were increased in lymphocytes from SCA patients (P<0.001). The TNF-α and IL-6 serum cytokines showed decreased on SCA patients comparing to control (P<0.001). The regulation of extracellular nucleotides released in response to hypoxia and inflammation through E-NTPDase and E-ADA enzymes represent an important control of purine-mediated in the SCA disease, avoiding elevated adenosine levels in the extracellular medium and consequent organ injuries in these patients. The pro-inflammatory cytokines decreased levels by use of hydroxyurea occur in attempt to reduce the pro-inflammatory response and prevent vaso-oclusive crisis.

  17. Deficits in Endogenous Adenosine Formation by Ecto-5′-Nucleotidase/CD73 Impair Neuromuscular Transmission and Immune Competence in Experimental Autoimmune Myasthenia Gravis

    Directory of Open Access Journals (Sweden)

    Laura Oliveira

    2015-01-01

    Full Text Available AMP dephosphorylation via ecto-5′-nucleotidase/CD73 is the rate limiting step to generate extracellular adenosine (ADO from released adenine nucleotides. ADO, via A2A receptors (A2ARs, is a potent modulator of neuromuscular and immunological responses. The pivotal role of ecto-5′-nucleotidase/CD73, in controlling extracellular ADO formation, prompted us to investigate its role in a rat model of experimental autoimmune myasthenia gravis (EAMG. Results show that CD4+CD25+FoxP3+ regulatory T cells express lower amounts of ecto-5′-nucleotidase/CD73 as compared to controls. Reduction of endogenous ADO formation might explain why proliferation of CD4+ T cells failed upon blocking A2A receptors activation with ZM241385 or adenosine deaminase in EAMG animals. Deficits in ADO also contribute to neuromuscular transmission failure in EAMG rats. Rehabilitation of A2AR-mediated immune suppression and facilitation of transmitter release were observed by incubating the cells with the nucleoside precursor, AMP. These findings, together with the characteristic increase in serum adenosine deaminase activity of MG patients, strengthen our hypothesis that the adenosinergic pathway may be dysfunctional in EAMG. Given that endogenous ADO formation is balanced by ecto-5′-nucleotidase/CD73 activity and that A2ARs exert a dual role to restore use-dependent neurocompetence and immune suppression in myasthenics, we hypothesize that stimulation of the two mechanisms may have therapeutic potential in MG.

  18. Regulation of adenosine levels during cerebral ischemia

    Institute of Scientific and Technical Information of China (English)

    Stephanie CHU; Wei XIONG; Dali ZHANG; Hanifi SOYLU; Chao SUN; Benedict C ALBENSI; Fiona E PARKINSON

    2013-01-01

    Adenosine is a neuromodulator with its level increasing up to 100-fold during ischemic events,and attenuates the excitotoxic neuronal injury.Adenosine is produced both intracellularly and extracellularly,and nucleoside transport proteins transfer adenosine across plasma membranes.Adenosine levels and receptor-mediated effects of adenosine are regulated by intracellular ATP consumption,cellular release of ATP,metabolism of extracellular ATP (and other adenine nucleotides),adenosine influx,adenosine efflux and adenosine metabolism.Recent studies have used genetically modified mice to investigate the relative contributions of intra-and extracellular pathways for adenosine formation.The importance of cortical or hippocampal neurons as a source or a sink of adenosine under basal and hypoxic/ischemic conditions was addressed through the use of transgenic mice expressing human equilibrative nucleoside transporter 1 (hENT1) under the control of a promoter for neuron-specific enolase.From these studies,we conclude that ATP consumption within neurons is the primary source of adenosine in neuronal cultures,but not in hippocampal slices or in vivo mice exposed to ischemic conditions.

  19. Ada Formal Methods in the STARS Environment

    Science.gov (United States)

    1992-06-03

    Ariel Semantics for nanoAVA ....... ........................ 56 5.3.1 Caliban Types ....................................... 56 5.3.2 Caliban ...Expressions ........ ........................... 57 5.3.3 Caliban Definitions ........ ............................ 58 5.3.4 Clio’s Metalanguage...59 5.3.5 A Summary of Ada-Ariel Semantics ........................ 60 5.3.6 A Caliban Encoding of an Ariel Semantics for

  20. LAS DOS TRÍADAS DEBEJARANO

    Directory of Open Access Journals (Sweden)

    Jorge Iván González

    Full Text Available El artículo diseute "dos tríadas" que propone Bejarano para calificar a la teoría económica actual. La primera tríada tiene que ver con el realismo, la pertinencia y la relevancia de la teoría. Y la segunda tríada con sus dimensiones política, institucional y moral. El artículo centra la atención en esta segunda tríada, argumentando que la teoría no es apolítica, ainstitucional y amoral como afirma Bejarano. El examen crítico de la posición de Bejarano se sustenta en algunas de las tesis de: Walras, Marshall, Hicks, vickrey, Samuelson y Arrow.This article discusses the "two triads" that Bejarano has proposed in order to describe present economic theory. The first triad refers to the realism, pertinence and relevance of the theory. The second triad to its political, institutional and moral dimension. The article centers its attention on this second triad, arguing that the theory is not apolitical, uninstitutional and amoral as Bejarano states. The critical examination of Bejarano's proposition is supported on thesis of Walras, Marshall, Hicks, Vickrey, Samuelson and Arrow.

  1. Alma Flor Ada: Writer, Translator, Storyteller.

    Science.gov (United States)

    Brodie, Carolyn S.

    2003-01-01

    Discusses the work of children's author Alma Flor Ada, a Cuban native who has won awards honoring Latino writers and illustrators. Includes part of an interview that explores her background, describes activity ideas, and presents a bibliography of works written by her (several title published in both English and Spanish) as well as sources of…

  2. AdaNET prototype library administration manual

    Science.gov (United States)

    Hanley, Lionel

    1989-01-01

    The functions of the AdaNET Prototype Library of Reusable Software Parts is described. Adopted from the Navy Research Laboratory's Reusability Guidebook (V.5.0), this is a working document, customized for use the the AdaNET Project. Within this document, the term part is used to denote the smallest unit controlled by a library and retrievable from it. A part may have several constituents, which may not be individually tracked. Presented are the types of parts which may be stored in the library and the relationships among those parts; a concept of trust indicators which provide measures of confidence that a user of a previously developed part may reasonably apply to a part for a new application; search and retrieval, configuration management, and communications among those who interact with the AdaNET Prototype Library; and the AdaNET Prototype, described from the perspective of its three major users: the part reuser and retriever, the part submitter, and the librarian and/or administrator.

  3. APOBEC deaminases-mutases with defensive roles for immunity

    Institute of Scientific and Technical Information of China (English)

    Courtney; PROCHNOW; Ronda; BRANSTEITTER

    2009-01-01

    In recent years, tremendous progress has been made in the elucidation of the biological roles and molecular mechanisms of the apolioprotein B mRNA-editing enzyme catalytic polypeptide (APOBEC) family of enzymes. The APOBEC family of cytidine deaminases has important functional roles within the adaptive and innate immune system. Activation induced cytidine deaminase (AID) plays a central role in the biochemical steps of somatic hypermutation and class switch recombination during antibody maturation, and the APOBEC 3 enzymes are able to inhibit the mobility of retroelements and the replication of retroviruses and DNA viruses, such as the human immunodeficiency virus type-1 and hepatitis B virus. Recent advances in structural and functional studies of the APOBEC enzymes provide new biochemical insights for how these enzymes carry out their biological roles. In this review, we provide an overview of these recent advances in the APOBEC field with a special emphasis on AID and APOBEC3G.

  4. Structure of human cytidine deaminase bound to a potent inhibitor.

    Science.gov (United States)

    Chung, Sang J; Fromme, J Christopher; Verdine, Gregory L

    2005-02-10

    Human cytidine deaminase (CDA) is an enzyme prominent for its role in catalyzing metabolic processing of nucleoside-type anticancer and antiviral agents. It is thus a promising target for the development of small molecule therapeutic adjuvants. We report the first crystal structure of human CDA as a complex with a tight-binding inhibitor, diazepinone riboside 1. The structure reveals that inhibitor 1 is able to establish a canonical pi/pi-interaction with a key active site residue, Phe 137.

  5. 49 CFR 37.125 - ADA paratransit eligibility: Process.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 1 2010-10-01 2010-10-01 false ADA paratransit eligibility: Process. 37.125... INDIVIDUALS WITH DISABILITIES (ADA) Paratransit as a Complement to Fixed Route Service § 37.125 ADA paratransit eligibility: Process. Each public entity required to provide complementary paratransit service...

  6. 49 CFR 37.123 - ADA paratransit eligibility: Standards.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 1 2010-10-01 2010-10-01 false ADA paratransit eligibility: Standards. 37.123... INDIVIDUALS WITH DISABILITIES (ADA) Paratransit as a Complement to Fixed Route Service § 37.123 ADA paratransit eligibility: Standards. (a) Public entities required by § 37.121 of this subpart to...

  7. LOS NIVELES SÉRICOS DE ADENOSIN DEAMINASA Y ÁCIDO ÚRICO SE CORRELACIONAN EN PACIENTES GESTANTES CON TRASTORNOS HIPERTENSIVOS

    OpenAIRE

    2009-01-01

    Objetivo: Evaluar los niveles séricos de la enzima adenosin-deaminasa (ADA) en pacientes gestantes normales y en pacientes con trastornos hipertensivos del embarazo, para determinar su relación con la gravedad del trastorno hipertensivo y con los niveles séricos de marcadores bioquímicos. Método: Se evaluaron pacientes con preeclampsia leve, preeclampsia grave, hipertensión gestacional y embarazadas sanas (n=10 por cada grupo). Se determinaron los niveles de ADA, ácido úrico, creatinina, amon...

  8. Pathologic overproduction: the bad side of adenosine.

    Science.gov (United States)

    Borea, Pier Andrea; Gessi, Stefania; Merighi, Stefania; Vincenzi, Fabrizio; Varani, Katia

    2017-03-02

    Adenosine is an endogenous ubiquitous purine nucleoside, increased by hypoxia, ischemia and tissue damage that mediates a number of physiopathological effects by interacting with four G-protein-coupled receptors, identified as A1 , A2A , A2B , and A3 . Physiological and acutely-increased adenosine is associated with beneficial effects mostly including vasodilation and decrease of inflammation. In contrast chronic overproduction of adenosine occurs in important pathological states, where long lasting increases in the nucleoside levels are responsible for the bad side of adenosine associated with chronic inflammation, fibrosis and organ damage. In this review we describe and critically discuss the pathologic overproduction of adenosine analysing when, where and how adenosine exerts its detrimental effects through the body.

  9. L-Arginine Intake Effect on Adenine Nucleotide Metabolism in Rat Parenchymal and Reproductive Tissues

    Directory of Open Access Journals (Sweden)

    G. Kocic

    2012-01-01

    Full Text Available L-arginine is conditionally essetcial amino acid, required for normal cell growth, protein synthesis, ammonia detoxification, tissue growth and general performance, proposed in the treatment of men sterility and prevention of male impotence. The aim of the present paper was to estimate the activity of the enzymes of adenine nucleotide metabolism: 5′-nucleotidase (5′-NU, adenosine deaminase (ADA, AMP deaminase, and xanthine oxidase (XO, during dietary intake of L-arginine for a period of four weeks of male Wistar rats. Adenosine concentration in tissues is maintained by the relative activities of the adenosine-producing enzyme, 5′-NU and the adenosine-degrading enzyme-ADA adenosine deaminase. Dietary L-arginine intake directed adenine nucleotide metabolism in liver, kidney, and testis tissue toward the activation of adenosine production, by increased 5′-NU activity and decreased ADA activity. Stimulation of adenosine accumulation could be of importance in mediating arginine antiatherosclerotic, vasoactive, immunomodulatory, and antioxidant effects. Assuming that the XO activity reflects the rate of purine catabolism in the cell, while the activity of AMP deaminase is of importance in ATP regeneration, reduced activity of XO, together with the increased AMP-deaminase activity, may suggest that adenine nucleotides are presumably directed to the ATP regenerating process during dietary L-arginine intake.

  10. Ada (Trade Name) Bibliography. Volume 3.

    Science.gov (United States)

    1986-02-01

    MARIA : FREEMAN. PETER: WASSERMAN, ANTHONY I. DOCUMENT NUMBER: 5484 DOCUMENT DATE: 11/82 TYPE: TECHNICAL REPORT In Spring, 1982, a questionnaire was...VALIDATION AVAILABLE FROM: THE AUTHOR SPONSORS: U.S.A.F. ASD,WRIGHT-PATTERSON AFB, OH AN ADA LANGUAGE PRIMER, PART I SAIB, SABINA H. DOCUMENT NUMBER: 6214...PRIMER, PART II SAIB, SABINA H. DOCUMENT NUMBER: 6215 TYPE: JOURNAL ARTICLE BYTE, VOL 9, ISSUE 6, 14 P. This article is the second of a two-part

  11. Ada for Embedded Systems: Issues and Questions.

    Science.gov (United States)

    1987-12-01

    appropriate order based on the task dependency hierarchy, which the ART maintains and adds to when tasks are created [ Reino 86]. The master-slave, parent...termination are needed [ Reino 86]. Tasks provide a considerable overhead in the runtime system because the status must be maintained for context...Practitioners Approach. McGraw-Hill International, 1982. [ Reino 86] Kurki-Suonio, R. An Operational Model for Ada Tasking. Technical Report 1/1986, Tampere

  12. Ada (Trade Name) Bibliography. Volume 2.

    Science.gov (United States)

    1984-03-01

    describes the characteristics that " such methologies should possess, Emphasis is given to the process by which software is developed for Ada applications...1. PP. 30-35. 01/82 This article is a proposal for an experiment to relate software metrics to software project observables , in particular to the...that arise in developing embedded software systems. The case studies are of two kinds: pedagogical and observational . The pedagogical case studies

  13. Object-oriented programming with mixins in Ada

    Science.gov (United States)

    Seidewitz, ED

    1992-01-01

    Recently, I wrote a paper discussing the lack of 'true' object-oriented programming language features in Ada 83, why one might desire them in Ada, and how they might be added in Ada 9X. The approach I took in this paper was to build the new object-oriented features of Ada 9X as much as possible on the basic constructs and philosophy of Ada 83. The object-oriented features proposed for Ada 9X, while different in detail, are based on the same kind of approach. Further consideration of this approach led me on a long reflection on the nature of object-oriented programming and its application to Ada. The results of this reflection, presented in this paper, show how a fairly natural object-oriented style can indeed be developed even in Ada 83. The exercise of developing this style is useful for at least three reasons: (1) it provides a useful style for programming object-oriented applications in Ada 83 until new features become available with Ada 9X; (2) it demystifies many of the mechanisms that seem to be 'magic' in most object-oriented programming languages by making them explicit; and (3) it points out areas that are and are not in need of change in Ada 83 to make object-oriented programming more natural in Ada 9X. In the next four sections I will address in turn the issues of object-oriented classes, mixins, self-reference and supertyping. The presentation is through a sequence of examples. This results in some overlap with that paper, but all the examples in the present paper are written entirely in Ada 83. I will return to considerations for Ada 9X in the last section of the paper.

  14. ACTIVATION OF A CRYPTIC D-SERINE DEAMINASE (DSD) GENE FROM PSEUDOMONAS CEPACIA 17616

    Science.gov (United States)

    D-serine inhibits growth of P. cepacia 17616; however, resistant mutants able to express an ordinarily cryptic D-serine deaminase (dsd) gene were isolated readily. The resistant strains formed high levels of a D-serine deaminase active on D-threonine as well as D-serine. IS eleme...

  15. Adenosine, Energy Metabolism, and Sleep

    Directory of Open Access Journals (Sweden)

    Tarja Porkka-Heiskanen

    2003-01-01

    Full Text Available While the exact function of sleep remains unknown, it is evident that sleep was developed early in phylogenesis and represents an ancient and vital strategy for survival. Several pieces of evidence suggest that the function of sleep is associated with energy metabolism, saving of energy, and replenishment of energy stores. Prolonged wakefulness induces signs of energy depletion in the brain, while experimentally induced, local energy depletion induces increase in sleep, similarly as would a period of prolonged wakefulness. The key molecule in the induction of sleep appears to be adenosine, which induces sleep locally in the basal forebrain.

  16. An adenosine A(2A) antagonist injected in the NTS reverses thermal prolongation of the LCR in decerebrate piglets.

    Science.gov (United States)

    Xia, Luxi; Bartlett, Donald; Leiter, J C

    2008-12-31

    Hyperthermia prolongs the laryngeal chemoreflex (LCR). Under normothermic conditions, adenosine antagonists shorten and adenosine A(2A) (Ad-A(2A)) agonists prolong the LCR. Therefore, we tested the hypothesis that SCH-58261, an Ad-A(2A) receptor antagonist, would prevent thermal prolongation of the LCR when injected unilaterally within the nucleus of the solitary tract (NTS). We studied decerebrate piglets aged 4-13 days. We elicited the LCR by injecting 0.1ml of water into the larynx and recorded integrated phrenic nerve activity. The laryngeal chemoreflex was prolonged when the body temperature of each piglet was raised approximately 2.5 degrees C, and SCH-58261 reversed the thermal prolongation of the LCR when injected into the NTS (n=13), but not when injected in the nucleus ambiguus (n=9). Injections of vehicle alone into the NTS did not alter the thermal prolongation of the LCR (n=9). We conclude that activation of adenosine receptors, perhaps located on GABAergic neurons in the NTS, contributes to thermal prolongation of the LCR.

  17. Regulation of Activation Induced Deaminase (AID) by Estrogen.

    Science.gov (United States)

    Pauklin, Siim

    2016-01-01

    Regulation of Activation Induced Deaminase (AID) by the hormone estrogen has important implications for understanding adaptive immune responses as well as the involvement of AID in autoimmune diseases and tumorigenesis. This chapter describes the general laboratory techniques for analyzing AID expression and activity induced by estrogen, focusing on the isolation and preparation of cells for hormone treatment and the subsequent analysis of AID responsiveness to estrogen at the RNA level and for determining the regulation of AID activity via estrogen by analyzing Ig switch circle transcripts and mutations in switch region loci.

  18. New insights into 1-aminocyclopropane-1-carboxylate (ACC deaminase phylogeny, evolution and ecological significance.

    Directory of Open Access Journals (Sweden)

    Francisco X Nascimento

    Full Text Available The main objective of this work is the study of the phylogeny, evolution and ecological importance of the enzyme 1-aminocyclopropane-1-carboxylate (ACC deaminase, the activity of which represents one of the most important and studied mechanisms used by plant growth-promoting microorganisms. The ACC deaminase gene and its regulatory elements presence in completely sequenced organisms was verified by multiple searches in diverse databases, and based on the data obtained a comprehensive analysis was conducted. Strain habitat, origin and ACC deaminase activity were taken into account when analyzing the results. In order to unveil ACC deaminase origin, evolution and relationships with other closely related pyridoxal phosphate (PLP dependent enzymes a phylogenetic analysis was also performed. The data obtained show that ACC deaminase is mostly prevalent in some Bacteria, Fungi and members of Stramenopiles. Contrary to previous reports, we show that ACC deaminase genes are predominantly vertically inherited in various bacterial and fungal classes. Still, results suggest a considerable degree of horizontal gene transfer events, including interkingdom transfer events. A model for ACC deaminase origin and evolution is also proposed. This study also confirms the previous reports suggesting that the Lrp-like regulatory protein AcdR is a common mechanism regulating ACC deaminase expression in Proteobacteria, however, we also show that other regulatory mechanisms may be present in some Proteobacteria and other bacterial phyla. In this study we provide a more complete view of the role for ACC deaminase than was previously available. The results show that ACC deaminase may not only be related to plant growth promotion abilities, but may also play multiple roles in microorganism's developmental processes. Hence, exploring the origin and functioning of this enzyme may be the key in a variety of important agricultural and biotechnological applications.

  19. Study the effect of bacterial 1-aminocyclopropane-1-carboxylate deaminase (ACC deaminase on resistance to salt stress in tomato plant

    Directory of Open Access Journals (Sweden)

    Maryam SADRNIA

    2011-11-01

    Full Text Available 1-aminocyclopropane-1-carboxylate deaminase (ACC deaminase produced by rhizobacteria could be remove theethylene precursor and stimulate plant growth. Aim of the work was investigation on effect of rhizosphere bacteria Pseudomonasmendocina containing plasmid carrying gene encoding ACC deaminase on resistance of tomato plant to salinity. Amplification ofacds gene in selected Pseudomonas was performed; the g e n e w a s c l o n e d i n Escherichia coli and was cloned subsequently in P.mendocina. Enzyme activity was determined in cloned Escherichia coli and cloned P. mendocina for confirmation of geneexpression. Effect of bacterial ACC deaminase on resistance of tomato plants to NaCl was studied in Pot and Greenhouse. In potexperiment, tomato plant treated by cloned P. mendocina was compared with plants treated by P. mendocina (without plasmid andcontrol group. Salinity were established by adding 172 and 207 mM of NaCl to irrigated water. Greenhouse experiments wereconducted in similar groups of bacteria in 207 mM of NaCl. Results obtained from pot experiment revealed that plants treated bycloned P. mendocina in 172 mM of NaCl was showed increasing content of growth than ones treated by P. mendocina and controlas 11%, 18.4% growth for the shoot, 16.6%, 3.7% for roots and 9.6%, 27.5% for wet weight after five weeks, respectively. In 207mM of NaCl, the results were as 14.9 %, 9.7% for shoot, 94.3%, 15.7% for roots and 96.4%, 50.6% for wet weight, respectively. Ingreenhouse experiment, results in same parameter in 207 mM of NaCl were revealed as 63.7%, 7 times for shoot, 2.8, 14 times forroots and 66.1%, 154 times for wet weight, respectively. We concluded that recombinant P. mendocina producing ACC deaminaseby reduction of ethylene content of tomato plant in high salt concentrations could result in improvement of plant resistance tosalinity.

  20. ada: An R Package for Stochastic Boosting

    Directory of Open Access Journals (Sweden)

    Mark Culp

    2006-09-01

    Full Text Available Boosting is an iterative algorithm that combines simple classification rules with ‘mediocre’ performance in terms of misclassification error rate to produce a highly accurate classification rule. Stochastic gradient boosting provides an enhancement which incorporates a random mechanism at each boosting step showing an improvement in performance and speed in generating the ensemble. ada is an R package that implements three popular variants of boosting, together with a version of stochastic gradient boosting. In addition, useful plots for data analytic purposes are provided along with an extension to the multi-class case. The algorithms are illustrated with synthetic and real data sets.

  1. ada: An R Package for Stochastic Boosting

    Directory of Open Access Journals (Sweden)

    Mark Culp

    2006-09-01

    Full Text Available Boosting is an iterative algorithm that combines simple classification rules with "mediocre" performance in terms of misclassification error rate to produce a highly accurate classification rule. Stochastic gradient boosting provides an enhancement which incorporates a random mechanism at each boosting step showing an improvement in performance and speed in generating the ensemble. ada is an R package that implements three popular variants of boosting, together with a version of stochastic gradient boosting. In addition, useful plots for data analytic purposes are provided along with an extension to the multi-class case. The algorithms are illustrated with synthetic and real data sets.

  2. Software engineering and the role of Ada: Executive seminar

    Science.gov (United States)

    Freedman, Glenn B.

    1987-01-01

    The objective was to introduce the basic terminology and concepts of software engineering and Ada. The life cycle model is reviewed. The application of the goals and principles of software engineering is applied. An introductory understanding of the features of the Ada language is gained. Topics addressed include: the software crises; the mandate of the Space Station Program; software life cycle model; software engineering; and Ada under the software engineering umbrella.

  3. Implementation of a production Ada project: The GRODY study

    Science.gov (United States)

    Godfrey, Sara; Brophy, Carolyn Elizabeth

    1989-01-01

    The use of the Ada language and design methodologies that encourage full use of its capabilities have a strong impact on all phases of the software development project life cycle. At the National Aeronautics and Space Administration/Goddard Space Flight Center (NASA/GSFC), the Software Engineering Laboratory (SEL) conducted an experiment in parallel development of two flight dynamics systems in FORTRAN and Ada. The differences observed during the implementation, unit testing, and integration phases of the two projects are described and the lessons learned during the implementation phase of the Ada development are outlined. Included are recommendations for future Ada development projects.

  4. Homeostatic control of synaptic activity by endogenous adenosine is mediated by adenosine kinase.

    Science.gov (United States)

    Diógenes, Maria José; Neves-Tomé, Raquel; Fucile, Sergio; Martinello, Katiuscia; Scianni, Maria; Theofilas, Panos; Lopatár, Jan; Ribeiro, Joaquim A; Maggi, Laura; Frenguelli, Bruno G; Limatola, Cristina; Boison, Detlev; Sebastião, Ana M

    2014-01-01

    Extracellular adenosine, a key regulator of neuronal excitability, is metabolized by astrocyte-based enzyme adenosine kinase (ADK). We hypothesized that ADK might be an upstream regulator of adenosine-based homeostatic brain functions by simultaneously affecting several downstream pathways. We therefore studied the relationship between ADK expression, levels of extracellular adenosine, synaptic transmission, intrinsic excitability, and brain-derived neurotrophic factor (BDNF)-dependent synaptic actions in transgenic mice underexpressing or overexpressing ADK. We demonstrate that ADK: 1) Critically influences the basal tone of adenosine, evaluated by microelectrode adenosine biosensors, and its release following stimulation; 2) determines the degree of tonic adenosine-dependent synaptic inhibition, which correlates with differential plasticity at hippocampal synapses with low release probability; 3) modulates the age-dependent effects of BDNF on hippocampal synaptic transmission, an action dependent upon co-activation of adenosine A2A receptors; and 4) influences GABAA receptor-mediated currents in CA3 pyramidal neurons. We conclude that ADK provides important upstream regulation of adenosine-based homeostatic function of the brain and that this mechanism is necessary and permissive to synaptic actions of adenosine acting on multiple pathways. These mechanistic studies support previous therapeutic studies and implicate ADK as a promising therapeutic target for upstream control of multiple neuronal signaling pathways crucial for a variety of neurological disorders.

  5. Transferring data objects: A focused Ada investigation

    Science.gov (United States)

    Legrand, Sue

    1988-01-01

    The use of the Ada language does not guarantee that data objects will be in the same form or have the same value after they have been stored or transferred to another system. There are too many possible variables in such things as the formats used and other protocol conditions. Differences may occur at many different levels of support. These include program level, object level, application level, and system level. A standard language is only one aspect of making a complex system completely homogeneous. Many components must be standardized and the various standards must be integrated. The principal issues in providing for interaction between systems are of exchanging files and data objects between systems which may not be compatible in terms of their host computer, operating system or other factors. A typical resolution of the problem of invalidating data involves at least a common external form, for data objects and for representing the relationships and attributes of data collections. Some of the issues dealing with the transfer of data are listed and consideration is given on how these issues may be handled in the Ada language.

  6. The ADAS inner solar system project

    Science.gov (United States)

    Hoffmann, Martin; Pignata, Giuliano; Barbieri, Cesare; Bertini, Ivano; Calvani, Massimo; Claudi, Riccardo; Hahn, Gerhard; Magrin, Sara; Mottola, Stefano; Neukum, Gerhard

    2002-11-01

    ADAS, the Asiago-DLR Asteroid Survey, is a joint program between the Department of Astronomy and Astronomical Observatory of Padova and the DLR Berlin, dedicated to the search of asteroids. The observations are made with a 67/92 cm Schmidt Telescope on Cima Ekar, near Asiago, in northern Italy. A 2K×2K CCD camera provided by the DLR is in use, mostly in Time Delay Integration mode. The camera has a field of 0.67 square degrees and can reach a limiting magnitude V ~ 21.0 in 3 minutes of exposure time. Specific search programs, in particular for objects permanently inside the orbit of the Earth (IEOs), have been started. A simulation of the performance of the IEO survey based on the model population from Bottke et al. shows that the discovery of a one-digit number of IEOs may be possible with the layout and equipment of the ADAS survey with a couple of years of operation.

  7. Repeated administration of adenosine increases its cardiovascular effects in rats.

    Science.gov (United States)

    Vidrio, H; García-Márquez, F; Magos, G A

    1987-01-20

    Hypotensive and negative chronotropic responses to adenosine in anesthetized rats increased after previous administration of the nucleoside. Bradycardia after adenosine in the isolated perfused rat heart was also potentiated after repeated administration at short intervals. This self-potentiation could be due to extracellular accumulation of adenosine and persistent stimulation of receptors caused by saturation or inhibition of cellular uptake of adenosine.

  8. Adenosine in the tuberomammillary nucleus inhibits the histaminergic system via A1 receptors and promotes non-rapid eye movement sleep.

    Science.gov (United States)

    Oishi, Yo; Huang, Zhi-Li; Fredholm, Bertil B; Urade, Yoshihiro; Hayaishi, Osamu

    2008-12-16

    Adenosine has been proposed to promote sleep through A(1) receptors (A(1)R's) and/or A(2A) receptors in the brain. We previously reported that A(2A) receptors mediate the sleep-promoting effect of prostaglandin D(2), an endogenous sleep-inducing substance, and that activation of these receptors induces sleep and blockade of them by caffeine results in wakefulness. On the other hand, A(1)R has been suggested to increase sleep by inhibition of the cholinergic region of the basal forebrain. However, the role and target sites of A(1)R in sleep-wake regulation remained controversial. In this study, immunohistochemistry revealed that A(1)R was expressed in histaminergic neurons of the rat tuberomammillary nucleus (TMN). In vivo microdialysis showed that the histamine release in the frontal cortex was decreased by microinjection into the TMN of N(6)-cyclopentyladenosine (CPA), an A(1)R agonist, adenosine or coformycin, an inhibitor of adenosine deaminase, which catabolizes adenosine to inosine. Bilateral injection of CPA into the rat TMN significantly increased the amount and the delta power density of non-rapid eye movement (non-REM; NREM) sleep but did not affect REM sleep. CPA-promoted sleep was observed in WT mice but not in KO mice for A(1)R or histamine H(1) receptor, indicating that the NREM sleep promoted by A(1)R-specific agonist depended on the histaminergic system. Furthermore, the bilateral injection of adenosine or coformycin into the rat TMN increased NREM sleep, which was completely abolished by coadministration of 1,3-dimethyl-8-cyclopenthylxanthine, a selective A(1)R antagonist. These results indicate that endogenous adenosine in the TMN suppresses the histaminergic system via A(1)R to promote NREM sleep.

  9. 59 FR- Realty Action; Ada and Owyhee, ID

    Science.gov (United States)

    1994-05-03

    ...-332A-02; IDI-29516] Realty Action; Ada and Owyhee, ID AGENCY: Bureau of Land Management, Interior. ACTION: Notice of Realty Action--IDI-29516; Exchange of public and private lands in Ada and Owyhee.... Containing 640 acres, more or less, in Owyhee County. The purpose of this exchange is to dispose of...

  10. Ada (Trademark) Tasking and Exceptions: A Formal Definition.

    Science.gov (United States)

    1985-01-01

    handlerjist exception- bandler -jead sequence...of-statements E14) exceptionjiandlerjlist -. exceptionji andler..head sequence..of..statements E15...Weatherly, Richard M., A Messale-Based Kernel to Support Ada Tasking, Proceedings of the IEEE Computer 06; Society 1984 Conference on Ada

  11. Alma Flor Ada and the Quest for Change

    Science.gov (United States)

    Manna, Anthony, L.; Hill, Janet; Kellogg, Kathy

    2004-01-01

    Alma Flor Ada, a folklorist, novelist, scholar, teacher, and children's book author has passionate dedication to education for social justice, equality, and peace. As a faculty member at the University of San Francisco, Ada has developed programs that help students and others transform their lives and has written several bilingual legends and…

  12. Mast cell adenosine receptors function: a focus on the A3 adenosine receptor and inflammation

    Directory of Open Access Journals (Sweden)

    Noam eRudich

    2012-06-01

    Full Text Available Adenosine is a metabolite, which has long been implicated in a variety of inflammatory processes. Inhaled adenosine provokes bronchoconstriction in asthmatics or chronic obstructive pulmonary disease (COPD patients, but not in non-asthmatics. This hyper responsiveness to adenosine appears to be mediated by mast cell activation. These observations have marked the receptor that mediates the bronchoconstrictor effect of adenosine on mast cells, as an attractive drug candidate. Four subtypes (A1, A2a, A2b and A3 of adenosine receptors have been cloned and shown to display distinct tissue distributions and functions. Animal models have firmly established the ultimate role of the A3 adenosine receptor (A3R in mediating hyper responsiveness to adenosine in mast cells, although the influence of the A2b adenosine receptor was confirmed as well. In contrast, studies of the A3R in humans have been controversial. In this review, we summarize data on the role of different adenosine receptors in mast cell regulation of inflammation and pathology, with a focus on the common and distinct functions of the A3R in rodent and human mast cells. The relevance of mouse studies to the human is discussed.

  13. Glutamate-induced depression of EPSP-spike coupling in rat hippocampal CA1 neurons and modulation by adenosine receptors.

    Science.gov (United States)

    Ferguson, Alexandra L; Stone, Trevor W

    2010-04-01

    The presence of high concentrations of glutamate in the extracellular fluid following brain trauma or ischaemia may contribute substantially to subsequent impairments of neuronal function. In this study, glutamate was applied to hippocampal slices for several minutes, producing over-depolarization, which was reflected in an initial loss of evoked population potential size in the CA1 region. Orthodromic population spikes recovered only partially over the following 60 min, whereas antidromic spikes and excitatory postsynaptic potentials (EPSPs) showed greater recovery, implying a change in EPSP-spike coupling (E-S coupling), which was confirmed by intracellular recording from CA1 pyramidal cells. The recovery of EPSPs was enhanced further by dizocilpine, suggesting that the long-lasting glutamate-induced change in E-S coupling involves NMDA receptors. This was supported by experiments showing that when isolated NMDA-receptor-mediated EPSPs were studied in isolation, there was only partial recovery following glutamate, unlike the composite EPSPs. The recovery of orthodromic population spikes and NMDA-receptor-mediated EPSPs following glutamate was enhanced by the adenosine A1 receptor blocker DPCPX, the A2A receptor antagonist SCH58261 or adenosine deaminase, associated with a loss of restoration to normal of the glutamate-induced E-S depression. The results indicate that the long-lasting depression of neuronal excitability following recovery from glutamate is associated with a depression of E-S coupling. This effect is partly dependent on activation of NMDA receptors, which modify adenosine release or the sensitivity of adenosine receptors. The results may have implications for the use of A1 and A2A receptor ligands as cognitive enhancers or neuroprotectants.

  14. Service dogs, psychiatric hospitalization, and the ADA.

    Science.gov (United States)

    Muramatsu, Russ S; Thomas, Kelly Jones; Leong, Stephanie L; Ragukonis, Frank

    2015-01-01

    A service dog is defined as "any dog that is individually trained to do work or perform tasks for the benefit of an individual with a disability, including a physical, sensory, psychiatric, intellectual, or other mental disability." Some psychiatric patients may depend on a service dog for day-to-day functioning. The Americans with Disabilities Act (ADA) established certain rights and responsibilities for individuals with disabilities and health care providers. Psychiatric hospitalization of a patient with a service dog may pose a problem and involves balancing the requirement to provide safe and appropriate psychiatric care with the rights of individuals with disabilities. This Open Forum examines issues that arise in such circumstances, reviews the literature, and provides a foundation for the development of policies and procedures.

  15. Adenosine stress protocols for myocardial perfusion imaging

    Directory of Open Access Journals (Sweden)

    Baškot Branislav

    2008-01-01

    Full Text Available Background/Aim. Treadmill test combined with myocardial perfusion scintigraphy (MPS is a commonly used technique in the assessment of coronary artery disease. There are many patients, however, who may not be able to undergo treadmill test. Such patients would benefit from pharmacological stress procedures combined with MPS. The most commonly used pharmacological agents for cardiac stress are coronary vasodilatators (adenosine, dipyridamol and catecholamines. Concomitant low-level treadmill exercise with adenosine pharmacologic stress (AdenoEX during MPS has become commonly used in recent years. A number of studies have demonstrated a beneficial impact of AdenoEX protocol. The aim of the study was, besides introducing into practice the two types of protocols of pharmatological stress test with adenosine, as a preparation for MPS, to compare and monitor the frequency of their side effects to quality, acquisition, as well as to standardize the onset time of acquisition (diagnostic imaging for both protocols. Methods. A total of 130 patients underwent pharmacological stress test with adenosine (vasodilatator. In 108 of the patients we performed concomitant exercise (AdenoEX of low level (50W by a bicycle ergometar. In 28 of the patients we performed Adenosine abbreviated protocol (AdenoSCAN. Side effects of adenosine were followed and compared between the two kinds of protocols AdenoEX and AdenoSCAN. Also compared were image quality and suggested time of acquisition after the stress test. Results. Numerous side effects were found, but being short-lived they did not require any active interventions. The benefit of AdenoEX versus AdenoSCAN included decreased side effects (62% vs 87%, improved safety and patients tolerance, improved target-to-background ratios because of less subdiaphragmatic activity, earlier acquisition, and improved sensitivity. Conclusion. The safety and efficacy of adenosine pharmacological stress is even better with concomitant

  16. Visualization design and verification of Ada tasking using timing diagrams

    Science.gov (United States)

    Vidale, R. F.; Szulewski, P. A.; Weiss, J. B.

    1986-01-01

    The use of timing diagrams is recommended in the design and testing of multi-task Ada programs. By displaying the task states vs. time, timing diagrams can portray the simultaneous threads of data flow and control which characterize tasking programs. This description of the system's dynamic behavior from conception to testing is a necessary adjunct to other graphical techniques, such as structure charts, which essentially give a static view of the system. A series of steps is recommended which incorporates timing diagrams into the design process. Finally, a description is provided of a prototype Ada Execution Analyzer (AEA) which automates the production of timing diagrams from VAX/Ada debugger output.

  17. Modulation and metamodulation of synapses by adenosine.

    Science.gov (United States)

    Ribeiro, J A; Sebastião, A M

    2010-06-01

    The presence of adenosine in all nervous system cells (neurones and glia) together with its intensive release following insults makes adenosine as a sort of 'regulator' of synaptic communication, leading to the homeostatic coordination of brain function. Besides the direct actions of adenosine on the neurosecretory mechanisms, to tune neurotransmitter release, adenosine receptors interact with other receptors as well as with transporters as part of its attempt to fine-tune synaptic transmission. This review will focus on examples of the different ways adenosine can use to modulate or metamodulate synapses, in other words, to trigger or brake the action of some neurotransmitters and neuromodulators, to cross-talk with other G protein-coupled receptors, with ionotropic receptors and with receptor kinases as well as with transporters. Most of these interactions occur through A2A receptors, which in spite of their low density in some brain areas, such as the hippocampus, may function as amplifiers of the signalling of other mediators at synapses.

  18. QUEST/Ada (Query Utility Environment for Software Testing of Ada): The development of a prgram analysis environment for Ada, task 1, phase 2

    Science.gov (United States)

    Brown, David B.

    1990-01-01

    The results of research and development efforts are described for Task one, Phase two of a general project entitled The Development of a Program Analysis Environment for Ada. The scope of this task includes the design and development of a prototype system for testing Ada software modules at the unit level. The system is called Query Utility Environment for Software Testing of Ada (QUEST/Ada). The prototype for condition coverage provides a platform that implements expert system interaction with program testing. The expert system can modify data in the instrument source code in order to achieve coverage goals. Given this initial prototype, it is possible to evaluate the rule base in order to develop improved rules for test case generation. The goals of Phase two are the following: (1) to continue to develop and improve the current user interface to support the other goals of this research effort (i.e., those related to improved testing efficiency and increased code reliable); (2) to develop and empirically evaluate a succession of alternative rule bases for the test case generator such that the expert system achieves coverage in a more efficient manner; and (3) to extend the concepts of the current test environment to address the issues of Ada concurrency.

  19. The role of microorganisms in the degradation of adenosine triphosphate (ATP) in chill-stored common carp (Cyprinus carpio) fillets.

    Science.gov (United States)

    Li, Dapeng; Zhang, Longteng; Song, Sijia; Wang, Zhiying; Kong, Chunli; Luo, Yongkang

    2017-06-01

    Biochemical and microbial changes after harvest strongly affect the final quality and shelf life of fish and fish products. In this study, the role of microbes in the degradation of adenosine triphosphate (ATP), and the origin of adenosine monophosphate deaminase (AMPD) and acid phosphatase (ACP) in common carp fillets during different stages of chilled storage (at 4°C) were investigated. The content of ATP, ADP, AMP, IMP, HxR, and Hx, the activity of AMPD and ACP, and the total count of viable, Aeromonas, Pseudomonas, H2S-producing bacteria, and lactic acid bacteria were examined. Results indicated that the population of microbial communities in control samples increased with storage time, and Pseudomonas peaked on the 10th day of storage. Changes in AMPD activity were less related to the abundance of microbes during the entire storage period. However, ACP was derived from both fish muscle and microbial secretion during the middle and late stages of storage. Degradation of ATP to IMP was not affected by spoilage bacteria, but the hydrolysis of IMP, and the transformation of HxR to Hx was affected considerably by the spoilage bacteria.

  20. Latvian PR people are world class / Ada Parr

    Index Scriptorium Estoniae

    Parr, Ada

    2004-01-01

    Suhtekorraldusfirma Porter Novelli rahvusvahelise partnerluse juht suhtekorralduse osatähtsuse kasvust ettevõtete äritegevuses, suhtekorraldusturu olukorrast ja teenuste kvaliteedi tasemest Baltimaades. Vt. samas: Ada Parr recommends

  1. A report on NASA software engineering and Ada training requirements

    Science.gov (United States)

    Legrand, Sue; Freedman, Glenn B.; Svabek, L.

    1987-01-01

    NASA's software engineering and Ada skill base are assessed and information that may result in new models for software engineering, Ada training plans, and curricula are provided. A quantitative assessment which reflects the requirements for software engineering and Ada training across NASA is provided. A recommended implementation plan including a suggested curriculum with associated duration per course and suggested means of delivery is also provided. The distinction between education and training is made. Although it was directed to focus on NASA's need for the latter, the key relationships to software engineering education are also identified. A rationale and strategy for implementing a life cycle education and training program are detailed in support of improved software engineering practices and the transition to Ada.

  2. Evaluation of Ada as a Communications Programming Language.

    Science.gov (United States)

    1981-03-31

    drastically, altered or circumvented to provide a communicatin system with sufficient resources to operate at a required level of performance. 3.3.1.2...Command (CORADCO4) and standard Digital Equipment Corporation VAX 11/780 system * software. Plans include the hosting of Ada/ED on the VAX 11/780 at the... Corporation , Bedford, MA, August, 1978. b. /LOGl79a/ LOGICON, "Formal Specification of GUARD Trusted Software (Draft)," ARPA-78C032303, September, 1979

  3. Myeloprotection by Cytidine Deaminase Gene Transfer in Antileukemic Therapy

    Directory of Open Access Journals (Sweden)

    Nico Lachmann

    2013-03-01

    Full Text Available Gene transfer of drug resistance (CTX-R genes can be used to protect the hematopoietic system from the toxicity of anticancer chemotherapy and this concept recently has been proven by overexpression of a mutant O6-methylguaninemethyltransferase in the hematopoietic system of glioblastoma patients treated with temozolomide. Given its protection capacity against such relevant drugs as cytosine arabinoside (ara-C, gemcitabine, decitabine, or azacytidine and the highly hematopoiesis-specific toxicity profile of several of these agents, cytidine deaminase (CDD represents another interesting candidate CTX-R gene and our group recently has established the myeloprotective capacity of CDD gene transfer in a number of murine transplant studies. Clinically, CDD overexpression appears particularly suited to optimize treatment strategies for acute leukemias and myelodysplasias given the efficacy of ara-C (and to a lesser degree decitabine and azacytidine in these disease entities. This article will review the current state of the art with regard to CDD gene transfer and point out potential scenarios for a clinical application of this strategy. In addition, risks and potential side effects associated with this approach as well as strategies to overcome these problems will be highlighted.

  4. Three-Dimensional Structure and Catalytic Mechanism of Cytosine Deaminase

    Energy Technology Data Exchange (ETDEWEB)

    R Hall; A Fedorov; C Xu; E Fedorov; S Almo; F Raushel

    2011-12-31

    Cytosine deaminase (CDA) from E. coli is a member of the amidohydrolase superfamily. The structure of the zinc-activated enzyme was determined in the presence of phosphonocytosine, a mimic of the tetrahedral reaction intermediate. This compound inhibits the deamination of cytosine with a K{sub i} of 52 nM. The zinc- and iron-containing enzymes were characterized to determine the effect of the divalent cations on activation of the hydrolytic water. Fe-CDA loses activity at low pH with a kinetic pKa of 6.0, and Zn-CDA has a kinetic pKa of 7.3. Mutation of Gln-156 decreased the catalytic activity by more than 5 orders of magnitude, supporting its role in substrate binding. Mutation of Glu-217, Asp-313, and His-246 significantly decreased catalytic activity supporting the role of these three residues in activation of the hydrolytic water molecule and facilitation of proton transfer reactions. A library of potential substrates was used to probe the structural determinants responsible for catalytic activity. CDA was able to catalyze the deamination of isocytosine and the hydrolysis of 3-oxauracil. Large inverse solvent isotope effects were obtained on k{sub cat} and k{sub cat}/K{sub m}, consistent with the formation of a low-barrier hydrogen bond during the conversion of cytosine to uracil. A chemical mechanism for substrate deamination by CDA was proposed.

  5. Examining the reliability of ADAS-Cog change scores.

    Science.gov (United States)

    Grochowalski, Joseph H; Liu, Ying; Siedlecki, Karen L

    2016-09-01

    The purpose of this study was to estimate and examine ways to improve the reliability of change scores on the Alzheimer's Disease Assessment Scale, Cognitive Subtest (ADAS-Cog). The sample, provided by the Alzheimer's Disease Neuroimaging Initiative, included individuals with Alzheimer's disease (AD) (n = 153) and individuals with mild cognitive impairment (MCI) (n = 352). All participants were administered the ADAS-Cog at baseline and 1 year, and change scores were calculated as the difference in scores over the 1-year period. Three types of change score reliabilities were estimated using multivariate generalizability. Two methods to increase change score reliability were evaluated: reweighting the subtests of the scale and adding more subtests. Reliability of ADAS-Cog change scores over 1 year was low for both the AD sample (ranging from .53 to .64) and the MCI sample (.39 to .61). Reweighting the change scores from the AD sample improved reliability (.68 to .76), but lengthening provided no useful improvement for either sample. The MCI change scores had low reliability, even with reweighting and adding additional subtests. The ADAS-Cog scores had low reliability for measuring change. Researchers using the ADAS-Cog should estimate and report reliability for their use of the change scores. The ADAS-Cog change scores are not recommended for assessment of meaningful clinical change.

  6. Hydraulic Capacity of an ADA Compliant Street Drain Grate

    Energy Technology Data Exchange (ETDEWEB)

    Lottes, Steven A. [Argonne National Lab. (ANL), Argonne, IL (United States); Bojanowski, Cezary [Argonne National Lab. (ANL), Argonne, IL (United States)

    2015-09-01

    Resurfacing of urban roads with concurrent repairs and replacement of sections of curb and sidewalk may require pedestrian ramps that are compliant with the American Disabilities Act (ADA), and when street drains are in close proximity to the walkway, ADA compliant street grates may also be required. The Minnesota Department of Transportation ADA Operations Unit identified a foundry with an available grate that meets ADA requirements. Argonne National Laboratory’s Transportation Research and Analysis Computing Center used full scale three dimensional computational fluid dynamics to determine the performance of the ADA compliant grate and compared it to that of a standard vane grate. Analysis of a parametric set of cases was carried out, including variation in longitudinal, gutter, and cross street slopes and the water spread from the curb. The performance of the grates was characterized by the fraction of the total volume flow approaching the grate from the upstream that was captured by the grate and diverted into the catch basin. The fraction of the total flow entering over the grate from the side and the fraction of flow directly over a grate diverted into the catch basin were also quantities of interest that aid in understanding the differences in performance of the grates. The ADA compliant grate performance lagged that of the vane grate, increasingly so as upstream Reynolds number increased. The major factor leading to the performance difference between the two grates was the fraction of flow directly over the grates that is captured by the grates.

  7. Las drogas diseñadas

    Directory of Open Access Journals (Sweden)

    Eddie Alvarado Vargas

    1998-12-01

    Full Text Available Cada vez cobra más fuerza la clasificación de las drogas que las divide en psictrópicos y estupefacientes y en Costa Rica se ha añadido la sustancia inhalable. Se hace una ligera definición sobre lo que es una droga y la diferencia con las sustancias indispensables para el organismo como son el agua, el oxígeno y los alimentos las cuales son necesarias para el mismo. En el mundo cada vez es mayor el número de estas sustancias fiscalizadas, y que es considerada una acción delictiva en determinadas ocasiones. Convenios internacionales que deben ser ratificados por las naciones exige que se especifique previamente el objeto material del Delito. Las Drogas Diseñadas son aquellas que por algún cambio realizado en un laboratorio sobre su molécula, tienen los efectos muchas veces superiores a la droga madre, pero que por no estar en la lista de drogas fiscalizadas en el momento de aparición de la misma, va permitiendo que, mientras se agrega a la lista de las mencionadas drogas fiscalizadas, estos actos queden impunes con gran daño por la Salud Pública y del individuo durante mucho tiempo. Costa Rica no escapa de esta realidad por lo que el "narcotraficante" siempre irá adelante con nuevas drogas diseñadas causando grandes estragos, mientras las mismas poco a poco se van incluyendo en la lista de sustancias fiscalizadas. Se hace mención sobre posibles soluciones, entre ellas está incluir en las listas de los convenios internacionales, decretos y reglamentos, nueva terminología que incluya las posibles variaciones de las moléculas de las sustancias fiscalizadas.Every time takes greater force the clasification of drugs, which are divided in psichotropics and stupefacients, and in Costa Rica a new classification has been added: inhalable sustances. A light definition of what a drug is and the difference between the indispensable sustances for the organism like the water, oxigen and food which are necesary for life.Every time the number

  8. Two Arabidopsis orthologs of the transcriptional coactivator ADA2 have distinct biological functions.

    Science.gov (United States)

    Hark, Amy T; Vlachonasios, Konstantinos E; Pavangadkar, Kanchan A; Rao, Sumana; Gordon, Hillary; Adamakis, Ioannis-Dimosthenis; Kaldis, Athanasios; Thomashow, Michael F; Triezenberg, Steven J

    2009-02-01

    Histone acetylation is an example of covalent modification of chromatin structure that has the potential to regulate gene expression. Gcn5 is a prototypical histone acetyltransferase that associates with the transcriptional coactivator Ada2. In Arabidopsis, two genes encode proteins that resemble yeast ADA2 and share approximately 45% amino acid sequence identity. We previously reported that plants harboring a T-DNA insertion in the ADA2b gene display a dwarf phenotype with developmental defects in several organs. Here we describe T-DNA insertion alleles in the ADA2a gene, which result in no dramatic growth or developmental phenotype. Both ADA2a and ADA2b are expressed in a variety of plant tissues; moreover, expression of ADA2a from a constitutive promoter fails to complement the ada2b-1 mutant phenotype, consistent with the hypothesis that the two proteins have distinct biochemical roles. To further probe the cellular roles of ADA2a and ADA2b, we studied the response of the transcriptional coactivator mutants to abiotic stress. Although ada2b seedlings display hypersensitivity to salt and abscisic acid and altered responses to low temperature stress, the responses of ada2a seedlings to abiotic stress generally parallel those of wildtype plants. Intriguingly, ada2a;ada2b double mutant plants display an intermediate, gcn5-like phenotype, suggesting that ADA2a and ADA2b each work independently with GCN5 to affect genome function in Arabidopsis.

  9. Multilineage hematopoietic reconstitution without clonal selection in ADA-SCID patients treated with stem cell gene therapy.

    Science.gov (United States)

    Aiuti, Alessandro; Cassani, Barbara; Andolfi, Grazia; Mirolo, Massimiliano; Biasco, Luca; Recchia, Alessandra; Urbinati, Fabrizia; Valacca, Cristina; Scaramuzza, Samantha; Aker, Memet; Slavin, Shimon; Cazzola, Matteo; Sartori, Daniela; Ambrosi, Alessandro; Di Serio, Clelia; Roncarolo, Maria Grazia; Mavilio, Fulvio; Bordignon, Claudio

    2007-08-01

    Gene transfer into HSCs is an effective treatment for SCID, although potentially limited by the risk of insertional mutagenesis. We performed a genome-wide analysis of retroviral vector integrations in genetically corrected HSCs and their multilineage progeny before and up to 47 months after transplantation into 5 patients with adenosine deaminase-deficient SCID. Gene-dense regions, promoters, and transcriptionally active genes were preferred retroviral integrations sites (RISs) both in preinfusion transduced CD34(+) cells and in vivo after gene therapy. The occurrence of insertion sites proximal to protooncogenes or genes controlling cell growth and self renewal, including LMO2, was not associated with clonal selection or expansion in vivo. Clonal analysis of long-term repopulating cell progeny in vivo revealed highly polyclonal T cell populations and shared RISs among multiple lineages, demonstrating the engraftment of multipotent HSCs. These data have important implications for the biology of retroviral vectors, the dynamics of genetically modified HSCs, and the safety of gene therapy.

  10. Remolding Diversified Objects in Ada95: Toward A-Object Pattern

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Ada provides full capacities of supporting object-orientation,but the diversified objects patterned in Ada are so intricate that Ada95's aim would be demolished. In order to complement the disfigurement that Ada does lack for a pr istine notion of class, this paper presents a remolded object pattern known as A -object, an Ada-based class description language A-ObjAda aiming at support f or A-object pattern and the related approach for key algorithms and implementation . In consequent, A-ObjAda hereby promotes Ada with highlighted object-orientati on , which not only effectively exploits the capacities in Ada95, but also rational ly hides befuddling concepts from Ada95.

  11. Structures of dCTP deaminase from Escherichia coli with bound substrate and product: reaction mechanism and determinants of mono- and bifunctionality for a family of enzymes

    DEFF Research Database (Denmark)

    Johansson, Eva; Fanø, Mathias; Bynck, Julie H;

    2005-01-01

    dCTP deaminase (EC 3.5.4.13) catalyzes the deamination of dCTP forming dUTP that via dUTPase is the main pathway providing substrate for thymidylate synthase in Escherichia coli and Salmonella typhimurium. dCTP deaminase is unique among nucleoside and nucleotide deaminases as it functions without...

  12. AdaNET phase 0 support for the AdaNET Dynamic Software Inventory (DSI) management system prototype. Catalog of available reusable software components

    Science.gov (United States)

    Hanley, Lionel

    1989-01-01

    The Ada Software Repository is a public-domain collection of Ada software and information. The Ada Software Repository is one of several repositories located on the SIMTEL20 Defense Data Network host computer at White Sands Missile Range, and available to any host computer on the network since 26 November 1984. This repository provides a free source for Ada programs and information. The Ada Software Repository is divided into several subdirectories. These directories are organized by topic, and their names and a brief overview of their topics are contained. The Ada Software Repository on SIMTEL20 serves two basic roles: to promote the exchange and use (reusability) of Ada programs and tools (including components) and to promote Ada education.

  13. The role of adenosine in Alzheimer's disease.

    Science.gov (United States)

    Rahman, Anisur

    2009-09-01

    Alzheimer's disease (AD) is a neurodegenerative disorder of the central nervous system manifested by cognitive and memory deterioration, a variety of neuropsychiatric symptoms, behavioral disturbances, and progressive impairment of daily life activities. Current pharmacotherapies are restricted to symptomatic interventions but do not prevent progressive neuronal degeneration. Therefore, new therapeutic strategies are needed to intervene with these progressive pathological processes. In the past several years adenosine, a ubiquitously released purine ribonucleoside, has become important for its neuromodulating capability and its emerging positive experimental effects in neurodegenerative diseases. Recent research suggests that adenosine receptors play important roles in the modulation of cognitive function. The present paper attempts to review published reports and data from different studies showing the evidence of a relationship between adenosinergic function and AD-related cognitive deficits. Epidemiological studies have found an association between coffee (a nonselective adenosine receptor antagonist) consumption and improved cognitive function in AD patients and in the elderly. Long-term administration of caffeine in transgenic animal models showed a reduced amyloid burden in brain with better cognitive performance. Antagonists of adenosine A2A receptors mimic these beneficial effects of caffeine on cognitive function. Neuronal cell cultures with amyloid beta in the presence of an A2A receptor antagonist completely prevented amyloid beta-induced neurotoxicity. These findings suggest that the adenosinergic system constitutes a new therapeutic target for AD, and caffeine and A2A receptor antagonists may have promise to manage cognitive dysfunction in AD.

  14. TO ESTIMATE SERUM ADA LEVELS IN BCG VACCINATED CHILDREN

    Directory of Open Access Journals (Sweden)

    Manjunatha Babu

    2015-04-01

    Full Text Available BACKGROUND: Tuberculosis is an important cause of morbidity and mortality in both adults and children, especially in developing countries. For prevention of childhood tuberculosis, BCG vaccination is advocated. Protection is attained 4 - 6 weeks after BCG vaccination a nd is mainly due to cell mediated immunity. After BCG vaccination almost 12 to 15% of neonates do not develop scar but have positive cell mediated immune response. ADA estimation is simple and inexpensive method to assess the cell mediated immunity. OBJECT IVE: To estimate serum ADA levels in children with and without BCG scar, after receiving BCG vaccination. MATERIAL AND METHODS: This prospective observational study was conducted at a tertiary care hospital for a period of 2 years. Babies in post natal ward and infants up to the age of 12 weeks attending well baby clinic for BCG vaccination were included in the study. Serum ADA lev els were estimated before BCG vaccination and 12 - 14 weeks after the vaccination. ADA levels were estimated by colorimetric method. Presence or absence of BCG scar was noted at 12 - 14 weeks of age. RESULTS: A total of 75 babies followed up, of which only 60 babies noted to have scar and in rest 15 babies there was no scar noticed. Twenty unvaccinated babies at 12 weeks of age were included as controls. The Mean ADA levels are significantly elevated after BCG vaccination (34 . 12 ± 3 . 28 U/L in comparison to le vels before vaccination (12 . 55± 2 . 64 U/L with p value 0. 06. CONCLUSION: After BCG vaccination, there is increase in serum ADA levels indicating adequ ate immunity. Increase in ADA levels in children without scar after BCG vaccination may indicate the probability of adequate immunity.

  15. Current Aspect and Future Prospect of Human Gene Therapy in Childhood (Gene Therapy : Advances in Research and Treatment)

    OpenAIRE

    1996-01-01

    Almost four years have passed since the first human gene therapy for adenosine deaminase (ADA) deficiency had been performed. Gene therapy protocols for cystic fibrosis, familial hypercholesterolaemia and hemophilia B were also started during this period. In this review, we reported and discussed the current aspect and the future prospect of gene therapy for inherited disease in childhood.

  16. Biological function of activation-induced cytidine deaminase (AID

    Directory of Open Access Journals (Sweden)

    Ritu Kumar

    2014-10-01

    Full Text Available Activation-induced Cytidine Deaminase (AID is an essential regulator of B cell diversification, but its full range of action has until recently been an enigma. Based on homology, it was originally proposed to be an RNA-editing enzyme, but so far, no RNA substrates are known. Rather, it functions by deaminating cytidine, and in this manner, coupled with base-excision repair or mismatch repair machinery, it is a natural mutator. This allows it to play a central role in adaptive immunity, whereby it initiates the processes of class switch recombination and somatic hypermutation to help generate a diverse and high-affinity repertoire of immunoglobulin isotypes. More recently, it has been appreciated that methylated cytidine, already known as a key epigenetic mark on DNA controlling gene expression, can also be a target for AID modification. Coupled with repair machinery, this can facilitate the active removal of methylated DNA. This activity can impact the process of cellular reprogramming, including transition of a somatic cell to pluripotency, which requires major reshuffling of epigenetic memory. Thus, seemingly disparate roles for AID in controlling immune diversity and epigenetic memory have a common mechanistic basis. However, the very activity that is so useful for B cell diversity and cellular reprogramming is dangerous for the integrity of the genome. Thus, AID expression and activity is tightly regulated, and deregulation is associated with diseases including cancer. Here, we review the range of AID functions with a focus on its mechanisms of action and regulation. Major questions remain to be answered concerning how and when AID is targeted to specific loci and how this impacts development and disease.

  17. Biological function of activation-induced cytidine deaminase (AID).

    Science.gov (United States)

    Kumar, Ritu; DiMenna, Lauren J; Chaudhuri, Jayanta; Evans, Todd

    2014-01-01

    Activation-induced Cytidine Deaminase (AID) is an essential regulator of B cell diversification, but its full range of action has until recently been an enigma. Based on homology, it was originally proposed to be an RNA-editing enzyme, but so far, no RNA substrates are known. Rather, it functions by deaminating cytidine, and in this manner, coupled with base-excision repair or mismatch repair machinery, it is a natural mutator. This allows it to play a central role in adaptive immunity, whereby it initiates the processes of class switch recombination and somatic hypermutation to help generate a diverse and high-affinity repertoire of immunoglobulin isotypes. More recently, it has been appreciated that methylated cytidine, already known as a key epigenetic mark on DNA controlling gene expression, can also be a target for AID modification. Coupled with repair machinery, this can facilitate the active removal of methylated DNA. This activity can impact the process of cellular reprogramming, including transition of a somatic cell to pluripotency, which requires major reshuffling of epigenetic memory. Thus, seemingly disparate roles for AID in controlling immune diversity and epigenetic memory have a common mechanistic basis. However, the very activity that is so useful for B cell diversity and cellular reprogramming is dangerous for the integrity of the genome. Thus, AID expression and activity is tightly regulated, and deregulation is associated with diseases including cancer. Here, we review the range of AID functions with a focus on its mechanisms of action and regulation. Major questions remain to be answered concerning how and when AID is targeted to specific loci and how this impacts development and disease.

  18. AMP is an adenosine A1 receptor agonist.

    Science.gov (United States)

    Rittiner, Joseph E; Korboukh, Ilia; Hull-Ryde, Emily A; Jin, Jian; Janzen, William P; Frye, Stephen V; Zylka, Mark J

    2012-02-17

    Numerous receptors for ATP, ADP, and adenosine exist; however, it is currently unknown whether a receptor for the related nucleotide adenosine 5'-monophosphate (AMP) exists. Using a novel cell-based assay to visualize adenosine receptor activation in real time, we found that AMP and a non-hydrolyzable AMP analog (deoxyadenosine 5'-monophosphonate, ACP) directly activated the adenosine A(1) receptor (A(1)R). In contrast, AMP only activated the adenosine A(2B) receptor (A(2B)R) after hydrolysis to adenosine by ecto-5'-nucleotidase (NT5E, CD73) or prostatic acid phosphatase (PAP, ACPP). Adenosine and AMP were equipotent human A(1)R agonists in our real-time assay and in a cAMP accumulation assay. ACP also depressed cAMP levels in mouse cortical neurons through activation of endogenous A(1)R. Non-selective purinergic receptor antagonists (pyridoxalphosphate-6-azophenyl-2',4'-disulfonic acid and suramin) did not block adenosine- or AMP-evoked activation. Moreover, mutation of His-251 in the human A(1)R ligand binding pocket reduced AMP potency without affecting adenosine potency. In contrast, mutation of a different binding pocket residue (His-278) eliminated responses to AMP and to adenosine. Taken together, our study indicates that the physiologically relevant nucleotide AMP is a full agonist of A(1)R. In addition, our study suggests that some of the physiological effects of AMP may be direct, and not indirect through ectonucleotidases that hydrolyze this nucleotide to adenosine.

  19. Adenosine: An immune modulator of inflammatory bowel diseases

    Institute of Scientific and Technical Information of China (English)

    Jeff Huaqing Ye; Vazhaikkurichi M Rajendran

    2009-01-01

    Inflammatory bowel disease (IBD) is a common and lifelong disabling gastrointestinal disease. Emerging treatments are being developed to target inflammatory cytokines which initiate and perpetuate the immune response. Adenosine is an important modulator of inflammation and its anti-inflammatory effects have been well established in humans as well as in animal models. High extracellular adenosine suppresses and resolves chronic inflammation in IBD models. High extracellular adenosine levels could be achieved by enhanced adenosine absorption and increased de novo synthesis. Increased adenosine concentration leads to activation of the A2a receptor on the cell surface of immune and epithelial cells that would be a potential therapeutic target for chronic intestinal inflammation. Adenosine is transported via concentrative nucleoside transporter and equilibrative nucleoside transporter transporters that are localized in apical and basolateral membranes of intestinal epithelial cells, respectively. Increased extracellular adenosine levels activate the A2a receptor, which would reduce cytokines responsible for chronic inflammation.

  20. Antihyperglycemic, antihyperlipidemic, anti-inflammatory and adenosine deaminase–lowering effects of garlic in patients with type 2 diabetes mellitus with obesity

    Directory of Open Access Journals (Sweden)

    Kumar R

    2013-01-01

    Full Text Available Rahat Kumar,1 Simran Chhatwal,1 Sahiba Arora,2 Sita Sharma,3 Jaswinder Singh,1 Narinder Singh,1 Vikram Bhandari,1 Ashok Khurana41Department of Pharmacology, 2Department of Biochemistry, 3Department of Obstetrics and Gynecology, 4Department of Medicine, Sri Guru Ram Das Institute of Medical Sciences and Research, Amritsar, IndiaIntroduction: Type 2 diabetes mellitus is a chronic disorder characterized by chronic hyperglycemia, with long term macrovascular and microvascular complications. The treatment is lifestyle management, exercise, weight control, and antihyperglycemic drugs such as sulfonylureas, biguanides, alpha-glucosidase inhibitors, thiazolidinediones, and meglitinide. Recently, a direct association between high levels of C-reactive protein and serum adenosine deaminase levels in patients with uncontrolled diabetes with long-term complications has been seen. This study was conducted to assess the antihyperglycemic, lipid-lowering, anti-inflammatory, and improving glycemic control of garlic in type 2 diabetes patients with obesity.Materials and methods: This was an open-label, prospective, comparative study, conducted on 60 patients having type 2 diabetes mellitus and obesity. The patients were divided into two groups of 30 each, of either sex. Group 1 was given metformin tablets, 500 mg twice a day (BD/three times a day (TDS, after meals, and group 2 was given metformin tablets, 500 mg BD/TDS, after meals, along with garlic (Allium sativum capsules, 250 mg BD. Patients were routinely investigated for fasting and postprandial blood glucose, glycosylated hemoglobin (HbA1c, serum adenosine deaminase levels and lipid profile (serum cholesterol, high-density lipoprotein cholesterol, triglycerides and low-density lipoprotein cholesterol at the start of the study. Patients were followed up for 12 weeks, with monitoring of fasting and postprandial blood glucose at 2 week intervals, and monitoring of the other parameters at the end of study

  1. Analysis of Generalization Ability for Different AdaBoost Variants Based on Classification and Regression Trees

    Directory of Open Access Journals (Sweden)

    Shuqiong Wu

    2015-01-01

    Full Text Available As a machine learning method, AdaBoost is widely applied to data classification and object detection because of its robustness and efficiency. AdaBoost constructs a global and optimal combination of weak classifiers based on a sample reweighting. It is known that this kind of combination improves the classification performance tremendously. As the popularity of AdaBoost increases, many variants have been proposed to improve the performance of AdaBoost. Then, a lot of comparison and review studies for AdaBoost variants have also been published. Some researchers compared different AdaBoost variants by experiments in their own fields, and others reviewed various AdaBoost variants by basically introducing these algorithms. However, there is a lack of mathematical analysis of the generalization abilities for different AdaBoost variants. In this paper, we analyze the generalization abilities of six AdaBoost variants in terms of classification margins. The six compared variants are Real AdaBoost, Gentle AdaBoost, Modest AdaBoost, Parameterized AdaBoost, Margin-pruning Boost, and Penalized AdaBoost. Finally, we use experiments to verify our analyses.

  2. An automated quality assessor for Ada object-oriented designs

    Science.gov (United States)

    Bailin, Sidney C.

    1988-01-01

    A tool for evaluating object-oriented designs (OODs) for Ada software is described. The tool assumes a design expressed as a hierarchy of object diagrams. A design of this type identifies the objects of a system, an interface to each object, and the usage relationships between objects. When such a design is implemented in Ada, objects become packages, interfaces become package specifications, and usage relationships become Ada `with' clauses and package references. An automated quality assessor has been developed that is based on flagging undesirable design constructs. For convenience, distinctions are made among three levels of severity: questionable, undesirable, and hazardous. A questionable construct is one that may well be appropriate. An undesirable construct is one that should be changed because it is potentially harmful to the reliability, maintainability, or reusability of the software. A hazardous construct is one that is undesirable and that introduces a high level of risk.

  3. An Ada run-time control architecture for telerobots

    Science.gov (United States)

    Balaram, J.; Rodriguez, G.

    1987-01-01

    This paper describes the architecture and Ada language implementation of a process-level run-time control subystem for the Jet Propulsion Laboratory (JPL) telerobot system. The concept of run-time control in a combined robot-teleoperation environment is examined and the telerobot system at JPL is described. An Ada language implementation of the JPL Telerobot Run-Time Controller (RTC) is described by highlighting the functional behavior of the subsystem, defining the internal modules, and providing a functional flow time sequence of internal module activity.

  4. Improved cytotoxic effects of Salmonella-producing cytosine deaminase in tumour cells

    Science.gov (United States)

    Mesa-Pereira, Beatriz; Medina, Carlos; Camacho, Eva María; Flores, Amando; Santero, Eduardo

    2015-01-01

    In order to increase the cytotoxic activity of a Salmonella strain carrying a salicylate-inducible expression system that controls cytosine deaminase production, we have modified both, the vector and the producer bacterium. First, the translation rates of the expression module containing the Escherichia coli codA gene cloned under the control of the Pm promoter have been improved by using the T7 phage gene 10 ribosome binding site sequence and replacing the original GUG start codon by AUG. Second, to increase the time span in which cytosine deaminase may be produced by the bacteria in the presence of 5-fluorocytosine, a 5-fluorouracyl resistant Salmonella strain has been constructed by deleting its upp gene sequence. This new Salmonella strain shows increased cytosine deaminase activity and, after infecting tumour cell cultures, increased cytotoxic and bystander effects under standard induction conditions. In addition, we have generated a purD mutation in the producer strain to control its intracellular proliferation by the presence of adenine and avoid the intrinsic Salmonella cell death induction. This strategy allows the analysis and comparison of the cytotoxic effects of cytosine deaminase produced by different Salmonella strains in tumour cell cultures. PMID:25227763

  5. Intracellular localization of human cytidine deaminase. Identification of a functional nuclear localization signal.

    Science.gov (United States)

    Somasekaram, A; Jarmuz, A; How, A; Scott, J; Navaratnam, N

    1999-10-01

    The cytidine deaminases belong to the family of multisubunit enzymes that catalyze the hydrolytic deamination of their substrate to a corresponding uracil product. They play a major role in pyrimidine nucleoside and nucleotide salvage. The intracellular distribution of cytidine deaminase and related enzymes has previously been considered to be cytosolic. Here we show that human cytidine deaminase (HCDA) is present in the nucleus. A highly specific, affinity purified polyclonal antibody against HCDA was used to analyze the intracellular localization of native HCDA in a variety of mammalian cells by in situ immunochemistry. Native HCDA was found to be present in the nucleus as well as the cytoplasm in several cell types. Indirect immunofluorescence microscopy indicated a predominantly nuclear localization of FLAG-tagged HCDA overexpressed in these cells. We have identified an amino-terminal bipartite nuclear localization signal that is both necessary and sufficient to direct HCDA and a non-nuclear reporter protein to the nucleus. We also show HCDA binding to the nuclear import receptor, importin alpha. Similar putative bipartite nuclear localization sequences are found in other cytidine/deoxycytidylate deaminases. The results presented here suggest that the pyrimidine nucleotide salvage pathway may operate in the nucleus. This localization may have implications in the regulation of nucleoside and nucleotide metabolism and nucleic acid biosynthesis.

  6. The development of an Ada programming support environment database: SEAD (Software Engineering and Ada Database), user's manual

    Science.gov (United States)

    Liaw, Morris; Evesson, Donna

    1988-01-01

    This is a manual for users of the Software Engineering and Ada Database (SEAD). SEAD was developed to provide an information resource to NASA and NASA contractors with respect to Ada-based resources and activities that are available or underway either in NASA or elsewhere in the worldwide Ada community. The sharing of such information will reduce the duplication of effort while improving quality in the development of future software systems. The manual describes the organization of the data in SEAD, the user interface from logging in to logging out, and concludes with a ten chapter tutorial on how to use the information in SEAD. Two appendices provide quick reference for logging into SEAD and using the keyboard of an IBM 3270 or VT100 computer terminal.

  7. Aminopyrimidine derivatives as adenosine antagonists / Janke Kleynhans

    OpenAIRE

    Kleynhans, Janke

    2013-01-01

    Aims of this project - The aim of this study was to design and synthesise novel 2-aminopyrimidine derivatives as potential adenosine A1 and A2A receptor antagonists. Background and rationale - Parkinson’s disease is the second most common neurodegenerative disorder (after Alzheimer’s disease) and is characterised by the selective death of the dopaminergic neurons of the nigro-striatal pathway. Distinctive motor symptoms include bradykinesia, muscle rigidity and tremor, while non-m...

  8. AdaBoost分类算法的数学分析%The Mathematical Analysis of AdaBoost Algorithm

    Institute of Scientific and Technical Information of China (English)

    王兵

    2014-01-01

    This article provides a gentle introduction to the AdaBoost algorithm, and the mathematical analysis of how to draft classifiers and assign a weight for them, finally form a strong classifier through a set of weak classifiers.%本文对AdaBoost算法进行了介绍,并从整个数学推导过程中分析怎样挑选分类器并设置权值,最终通过一组弱分类器组合构成强分类器。

  9. The Rate of Convergence of AdaBoost

    CERN Document Server

    Mukherjee, Indraneel; Schapire, Robert E

    2011-01-01

    The AdaBoost algorithm was designed to combine many "weak" hypotheses that perform slightly better than random guessing into a "strong" hypothesis that has very low error. We study the rate at which AdaBoost iteratively converges to the minimum of the "exponential loss." Unlike previous work, our proofs do not require a weak-learning assumption, nor do they require that minimizers of the exponential loss are finite. Our first result shows that at iteration $t$, the exponential loss of AdaBoost's computed parameter vector will be at most $\\epsilon$ more than that of any parameter vector of $\\ell_1$-norm bounded by $B$ in a number of rounds that is at most a polynomial in $B$ and $1/\\epsilon$. We also provide lower bounds showing that a polynomial dependence on these parameters is necessary. Our second result is that within $C/\\epsilon$ iterations, AdaBoost achieves a value of the exponential loss that is at most $\\epsilon$ more than the best possible value, where $C$ depends on the dataset. We show that this d...

  10. ADA and multi-microprocessor real-time simulation

    Science.gov (United States)

    Feyock, S.; Collins, W. R.

    1983-01-01

    The selection of a high-order programming language for a real-time distributed network simulation is described. The additional problem of implementing a language on a possibly changing network is addressed. The recently designed language ADA (trademarked by DoD) was chosen since it provides the best model of the underlying application to be simulated.

  11. Effects of adenosine agonist R-phenylisopropyl-adenosine on halothane anesthesia and antinociception in rats

    Institute of Scientific and Technical Information of China (English)

    Hai-chun MA; Yan-fen WANG; Chun-sheng FENG; Hua ZHAO; Shuji DOHI

    2005-01-01

    Aim: To investigate the antinociceptive effect of adenosine agonist Rphenylisopropyl-adenosine (R-PIA) given to conscious rats by intracerebroventricular (ICV) and intrathecal (IT), and identify the effect of R-PIA on minimum alveolar concentration (MAC) of halothane with pretreatment of A1 receptor an tagonist 8-cyclopentyl-1,3-dipropylxanthine (DPCPX) or K+ channel blocker 4-aminopyridine (4-AP). Methods: Sprague-Dawley rats were implanted with 24 gauge stainless steel guide cannula using stereotaxic apparatus and ICV method, and an IT catheter (PE-10, 8.5 cm) was inserted into the lumbar subarachnoid space, while the rats were under pentobarbital anesthesia. After one week of recovery from surgery, rats were randomly assigned to one of the following protocols: MAC of halothane, or tail-flick latency. All measurements were performed after R-PIA (0.8-2.0 μg) microinjection into ICV and IT with or without pretreatment of DPCPX or 4-AP. Results: Microinjection of adenosine agonist R PIA in doses of 0.8-2.0 μg into ICV and IT produced a significant dose- and time dependent antinociceptive action as reflected by increasing latency times and ICV administration of adenosine agonist R-PIA (0.8 μg) reducing halothane anes thetic requirements (by 29%). The antinociception and reducing halothane requirements effected by adenosine agonist R-PIA was abolished by DPCPX and 4-AP. Conclusion: ICV and IT administration of adenosine agonist R-PIA produced an antinociceptive effect in a dose-dependent manner and decreased hal othane MAC with painful stimulation through activation of A1 receptor subtype, and the underlying mechanism involves K+ channel activation.

  12. N6-(2-Hydroxyethyl)-Adenosine Exhibits Insecticidal Activity against Plutella xylostella via Adenosine Receptors

    Science.gov (United States)

    Fang, Ming; Chai, Yiqiu; Chen, Guanjv; Wang, Huidong; Huang, Bo

    2016-01-01

    The diamondback moth, Plutella xylostella, is one of the most important pests of cruciferous crops. We have earlier shown that N6-(2-hydroxyethyl)-adenosine (HEA) exhibits insecticidal activity against P. xylostella. In the present study we investigated the possible mechanism of insecticidal action of HEA on P. xylostella. HEA is a derivative of adenosine, therefore, we speculated whether it acts via P. xylostella adenosine receptor (PxAdoR). We used RNAi approach to silence PxAdoR gene and used antagonist of denosine receptor (AdoR) to study the insecticidal effect of HEA. We cloned the whole sequence of PxAdoR gene. A BLAST search using NCBI protein database showed a 61% identity with the Drosophila adenosine receptor (DmAdoR) and a 32–35% identity with human AdoR. Though the amino acids sequence of PxAdoR was different compared to other adenosine receptors, most of the amino acids that are known to be important for adenosine receptor ligand binding and signaling were present. However, only 30% binding sites key residues was similar between PxAdoR and A1R. HEA, at a dose of 1 mg/mL, was found to be lethal to the second-instar larvae of P. xylostella, and a significant reduction of mortality and growth inhibition ratio were obtained when HEA was administered to the larvae along with PxAdoR-dsRNA or antagonist of AdoR (SCH58261) for 36, 48, or 60 h. Especially at 48 h, the rate of growth inhibition of the PxAdoR knockdown group was 3.5-fold less than that of the HEA group, and the corrected mortality of SCH58261 group was reduced almost 2-fold compared with the HEA group. Our findings show that HEA may exert its insecticidal activity against P. xylostella larvae via acting on PxAdoR. PMID:27668428

  13. N6-(2-Hydroxyethyl)-Adenosine Exhibits Insecticidal Activity against Plutella xylostella via Adenosine Receptors.

    Science.gov (United States)

    Fang, Ming; Chai, Yiqiu; Chen, Guanjv; Wang, Huidong; Huang, Bo

    The diamondback moth, Plutella xylostella, is one of the most important pests of cruciferous crops. We have earlier shown that N6-(2-hydroxyethyl)-adenosine (HEA) exhibits insecticidal activity against P. xylostella. In the present study we investigated the possible mechanism of insecticidal action of HEA on P. xylostella. HEA is a derivative of adenosine, therefore, we speculated whether it acts via P. xylostella adenosine receptor (PxAdoR). We used RNAi approach to silence PxAdoR gene and used antagonist of denosine receptor (AdoR) to study the insecticidal effect of HEA. We cloned the whole sequence of PxAdoR gene. A BLAST search using NCBI protein database showed a 61% identity with the Drosophila adenosine receptor (DmAdoR) and a 32-35% identity with human AdoR. Though the amino acids sequence of PxAdoR was different compared to other adenosine receptors, most of the amino acids that are known to be important for adenosine receptor ligand binding and signaling were present. However, only 30% binding sites key residues was similar between PxAdoR and A1R. HEA, at a dose of 1 mg/mL, was found to be lethal to the second-instar larvae of P. xylostella, and a significant reduction of mortality and growth inhibition ratio were obtained when HEA was administered to the larvae along with PxAdoR-dsRNA or antagonist of AdoR (SCH58261) for 36, 48, or 60 h. Especially at 48 h, the rate of growth inhibition of the PxAdoR knockdown group was 3.5-fold less than that of the HEA group, and the corrected mortality of SCH58261 group was reduced almost 2-fold compared with the HEA group. Our findings show that HEA may exert its insecticidal activity against P. xylostella larvae via acting on PxAdoR.

  14. 77 FR 36231 - Americans With Disabilities Act (ADA) and Architectural Barriers Act (ABA) Accessibility...

    Science.gov (United States)

    2012-06-18

    ... Architectural Barriers Act (ABA) Accessibility Guidelines; Emergency Transportable Housing Units AGENCY... Disabilities Act (ADA) and Architectural Barriers Act (ABA) Accessibility Guidelines to specifically address... the ADA or ABA are readily accessible to and usable by individuals with disabilities. Other...

  15. The Role of Adenosine Signaling in Headache: A Review

    Directory of Open Access Journals (Sweden)

    Nathan T. Fried

    2017-03-01

    Full Text Available Migraine is the third most prevalent disease on the planet, yet our understanding of its mechanisms and pathophysiology is surprisingly incomplete. Recent studies have built upon decades of evidence that adenosine, a purine nucleoside that can act as a neuromodulator, is involved in pain transmission and sensitization. Clinical evidence and rodent studies have suggested that adenosine signaling also plays a critical role in migraine headache. This is further supported by the widespread use of caffeine, an adenosine receptor antagonist, in several headache treatments. In this review, we highlight evidence that supports the involvement of adenosine signaling in different forms of headache, headache triggers, and basic headache physiology. This evidence supports adenosine A2A receptors as a critical adenosine receptor subtype involved in headache pain. Adenosine A2A receptor signaling may contribute to headache via the modulation of intracellular Cyclic adenosine monophosphate (cAMP production or 5' AMP-activated protein kinase (AMPK activity in neurons and glia to affect glutamatergic synaptic transmission within the brainstem. This evidence supports the further study of adenosine signaling in headache and potentially illuminates it as a novel therapeutic target for migraine.

  16. Pretreatment with adenosine and adenosine A1 receptor agonist protects against intestinal ischemia-reperfusion injury in rat

    Institute of Scientific and Technical Information of China (English)

    V Haktan Ozacmak; Hale Sayan

    2007-01-01

    AIM: To examine the effects of adenosine and A1 receptor activation on reperfusion-induced small intestinal injury.METHODS: Rats were randomized into groups with sham operation, ischemia and reperfusion, and systemic treatments with either adenosine or 2-chloro-N6-cyclopentyladenosine, A1 receptor agonist or 8-cyclopentyl-1,3-dipropylxanthine, A1 receptor antagonist, plus adenosine before ischemia. Following reperfusion, contractions of ileum segments in response to KCl, carbachol and substance P were recorded. Tissue myeloperoxidase,malondialdehyde, and reduced glutathione levels were measured.RESULTS: Ischemia significantly decreased both contraction and reduced glutathione level which were ameliorated by adenosine and agonist administration. Treatment also decreased neutrophil infiltration and membrane lipid peroxidation. Beneficial effects of adenosine were abolished by pretreatment with A1 receptor antagonist.CONCLUSION: The data suggest that adenosine and A1 receptor stimulation attenuate ischemic intestinal injury via decreasing oxidative stress, lowering neutrophil infiltration, and increasing reduced glutathione content.

  17. A Pre-Allocation Strategy for Implement ADA95's Distrbuted Computing

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    In order to realize distributed computing of Ada95, this paper discusses Ada95's distributed system model and an implement model of Ada95's distributed computing—workstation cluster model. Under this model, we presents a pre-allocation strategy for allocating the computation quantity of distributed units evenly among workstations and also reducing the communication expense between those distributed units.

  18. 76 FR 38129 - Applications for New Awards; Americans With Disabilities Act (ADA) National Network Knowledge...

    Science.gov (United States)

    2011-06-29

    ... Applications for New Awards; Americans With Disabilities Act (ADA) National Network Knowledge Translation... Rehabilitation Research Projects (DRRP)--The ADA National Network Knowledge Translation Center Notice inviting... April 28, 2006 (71 FR 25472). The ADA National Network Knowledge Translation Center priority is from...

  19. Amelioration of high salinity stress damage by plant growth-promoting bacterial endophytes that contain ACC deaminase.

    Science.gov (United States)

    Ali, Shimaila; Charles, Trevor C; Glick, Bernard R

    2014-07-01

    Plant growth and productivity is negatively affected by soil salinity. However, it is predicted that plant growth-promoting bacterial (PGPB) endophytes that contain 1-aminocyclopropane-1-carboxylate (ACC) deaminase (E.C. 4.1.99.4) can facilitate plant growth and development in the presence of a number of different stresses. In present study, the ability of ACC deaminase containing PGPB endophytes Pseudomonas fluorescens YsS6, Pseudomonas migulae 8R6, and their ACC deaminase deficient mutants to promote tomato plant growth in the absence of salt and under two different levels of salt stress (165 mM and 185 mM) was assessed. It was evidence that wild-type bacterial endophytes (P. fluorescens YsS6 and P. migulae 8R6) promoted tomato plant growth significantly even in the absence of stress (salinity). Plants pretreated with wild-type ACC deaminase containing endophytic strains were healthier and grew to a much larger size under high salinity stress compared to plants pretreated with the ACC deaminase deficient mutants or no bacterial treatment (control). The plants pretreated with ACC deaminase containing bacterial endophytes exhibit higher fresh and dry biomass, higher chlorophyll contents, and a greater number of flowers and buds than the other treatments. Since the only difference between wild-type and mutant bacterial endophytes was ACC deaminase activity, it is concluded that this enzyme is directly responsible for the different behavior of tomato plants in response to salt stress. The use of PGPB endophytes with ACC deaminase activity has the potential to facilitate plant growth on land that is not normally suitable for the majority of crops due to their high salt contents.

  20. Mechanism of protection of adenosine from sulphate radical anion and repair of adenosine radicals by caffeic acid in aqueous solution

    Indian Academy of Sciences (India)

    M Sudha Swaraga; L Charitha; M Adinarayana

    2005-07-01

    The photooxidation of adenosine in presence of peroxydisulphate (PDS) has been studied by spectrophotometrically measuring the absorbance of adenosine at 260 nm. The rates of oxidation of adenosine by sulphate radical anion have been determined in the presence of different concentrations of caffeic acid. Increase in [caffeic acid] is found to decrease the rate of oxidation of adenosine suggesting that caffeic acid acts as an efficient scavenger of $SO_{4}^{\\bullet-}$ and protects adenosine from it. Sulphate radical anion competes for adenosine as well as for caffeic acid. The quantum yields of photooxidation of adenosine have been calculated from the rates of oxidation of adenosine and the light intensity absorbed by PDS at 254 nm, the wavelength at which PDS is activated to sulphate radical anion. From the results of experimentally determined quantum yields (exptl) and the quantum yields calculated (cal) assuming caffeic acid acting only as a scavenger of $SO_{4}^{\\bullet-}$ show that exptl values are lower than cal values. The ' values, which are experimentally found quantum yield values at each caffeic acid concentration and corrected for $SO_{4}^{\\bullet-}$ scavenging by caffeic acid, are also found to be greater than exptl values. These observations suggest that the transient adenosine radicals are repaired by caffeic acid in addition to scavenging of sulphate radical anions.

  1. SOYBEAN SEEDLING ROOT GROWTH PROMOTION BY 1-AMINOCYCLOPROPANE-1-CARBOXYLATE DEAMINASE-PRODUCING PSEUDOMONADS

    Directory of Open Access Journals (Sweden)

    Edi Husen

    2016-10-01

    Full Text Available Pseudomonad producing 1-aminocyclopropane-1-carboxylate (ACC deaminase (E.C.4.1.99.4 has been known to promote plant growth by lowering ethylene biosynthesis in higher plants, which can be induced by indole-3-acetic acid (IAA production. The objective of this study was to examine the ability of IAAproducing Pseudomonas isolated from local soil environment (rhizosphere of soybean grown in Plumbon's agricultural areain Cirebon, West Java, Indonesia to promote soybean root growth in relation to their ACC deaminase activities. The experiments were conducted in growth room and Laboratory of Soil Biology Research, Indonesian Soil Research Institute, Bogor, from January to August 2008. Soybean seeds were inoculated by immersing the seeds for 1 hour in bacterial cell suspension containing approximately 108-109 cells ml-1. The seeds were then germinatedfor 2 days before planting in growth pouches containing sterilized distilled water. All treated and untreated seeds were grown for 7 days in growth room at 24°C with 1300 lux of light intensity for 12-hour followed by a 12-hour dark period at 22°C. ACC deaminase activity of the isolates was assayed based on their ability to grow in Dworkin-Foster’s salt minimal medium containing ammonium sulfate or ACC as a source of nitrogen. Thirteen out of 81 isolates tested significantly increased soybean root length and weight, up to 50% from untreated plants. Of 13 isolates, 11 demonstrated ACC deaminase activities. Two isolates that did not show ACC deaminase activities had lower capacity to produce IAA. The results suggest that the effectiveness of IAA producing Pseudomonas in promoting the growth of the soybean seedlings is associated with their ACC deaminase activities or they produce IAA at low levels.

  2. Electroacupuncture improves neuropathic pain Adenosine,adenosine 5'-triphosphate disodium and their receptors perhaps change simultaneously

    Institute of Scientific and Technical Information of China (English)

    Wen Ren; Wenzhan Tu; Songhe Jiang; Ruidong Cheng; Yaping Du

    2012-01-01

    Applying a stimulating current to acupoints through acupuncture needles-known as electroacupuncture-has the potential to produce analgesic effects in human subjects and experimental animals.When acupuncture was applied in a rat model,adenosine 5'-triphosphate disodium in the extracellular space was broken down into adenosine,which in turn inhibited pain transmission by means of an adenosine A1 receptor-dependent process.Direct injection of an adenosine A1 receptor agonist enhanced the analgesic effect of acupuncture.The analgesic effect of acupuncture appears to be mediated by activation of A1 receptors located on ascending nerves.In neuropathic pain,there is upregulation of P2X purinoceptor 3(P2X3)receptor expression in dorsal root ganglion neurons.Conversely,the onset of mechanical hyperalgesia was diminished and established hyperalgesia was significantly reversed when P2X3 receptor expression was downregulated.The pathways upon which electroacupuncture appear to act are interwoven with pain pathways,and electroacupuncture stimuli converge with impulses originating from painful areas.Electroacupuncture may act via purinergic A1 and P2X3 receptors simultaneously to induce an analgesic effect on neuropathic pain.

  3. The circadian regulation of sleep: impact of a functional ADA-polymorphism and its association to working memory improvements.

    Directory of Open Access Journals (Sweden)

    Carolin F Reichert

    Full Text Available Sleep is regulated in a time-of-day dependent manner and profits working memory. However, the impact of the circadian timing system as well as contributions of specific sleep properties to this beneficial effect remains largely unexplored. Moreover, it is unclear to which extent inter-individual differences in sleep-wake regulation depend on circadian phase and modulate the association between sleep and working memory. Here, sleep electroencephalography (EEG was recorded during a 40-h multiple nap protocol, and working memory performance was assessed by the n-back task 10 times before and after each scheduled nap sleep episode. Twenty-four participants were genotyped regarding a functional polymorphism in adenosine deaminase (rs73598374, 12 G/A-, 12 G/G-allele carriers, previously associated with differences in sleep-wake regulation. Our results indicate that genotype-driven differences in sleep depend on circadian phase: heterozygous participants were awake longer and slept less at the end of the biological day, while they exhibited longer non rapid eye movement (NREM sleep and slow wave sleep concomitant with reduced power between 8-16 Hz at the end of the biological night. Slow wave sleep and NREM sleep delta EEG activity covaried positively with overall working memory performance, independent of circadian phase and genotype. Moreover, REM sleep duration benefitted working memory particularly when occurring in the early morning hours and specifically in heterozygous individuals. Even though based on a small sample size and thus requiring replication, our results suggest genotype-dependent differences in circadian sleep regulation. They further indicate that REM sleep, being under strong circadian control, boosts working memory performance according to genotype in a time-of-day dependent manner. Finally, our data provide first evidence that slow wave sleep and NREM sleep delta activity, majorly regulated by sleep homeostatic mechanisms, is

  4. AdaBoost for Improved Voice-Band Signal Classification

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    A good voice-band signal classification can not only enable the safe application of speech coding techniques,the implementation of a Digital Signal Interpolation (DSI)system, but also facilitate network administration and planning by providing accurate voice-band traffic analysis.A new method is proposed to detect and classify the presence of various voice-band signals on the General Switched Telephone Network ( GSTN ). The method uses a combination of simple base classifiers through the AdaBoost algorithm. The conventional classification features for voiceband data classification are combined and optimized by the AdaBoost algorithm and spectral subtraction method.Experiments show the simpleness, effectiveness, efficiency and flexibility of the method.

  5. Mutational analysis of the nucleotide binding site of Escherichia coli dCTP deaminase

    DEFF Research Database (Denmark)

    Thymark, Majbritt; Johansson, Eva; Larsen, Sine;

    2007-01-01

    In Escherichia coli and Salmonella typhimurium about 80% of the dUMP used for dTMP synthesis is derived from deamination of dCTP. The dCTP deaminase produces dUTP that subsequently is hydrolyzed by dUTPase to dUMP and diphosphate. The dCTP deaminase is regulated by dTTP that inhibits the enzyme...... of E138D in complex with dUTP showed a hydrogen bonding network in the active site similar to wild-type enzyme. However, changes in the hydrogen bond lengths between the carboxylate and a catalytic water molecule as well as a slightly different orientation of the pyrimidine ring of the bound nucleotide...

  6. Comorbidities in Neurology: Is Adenosine the Common Link?

    Science.gov (United States)

    Boison, Detlev; Aronica, Eleonora

    2015-01-01

    Comorbidities in Neurology represent a major conceptual and therapeutic challenge. For example, temporal lobe epilepsy (TLE) is a syndrome comprised of epileptic seizures and comorbid symptoms including memory and psychiatric impairment, depression, and sleep dysfunction. Similarly, Alzheimer’s disease (AD), Parkinson’s disease (PD), and Amyotrophic Lateral Sclerosis (ALS) are accompanied by various degrees of memory dysfunction. Patients with AD have an increased likelihood for seizures, whereas all four conditions share certain aspects of psychosis, depression, and sleep dysfunction. This remarkable overlap suggests common pathophysiological mechanisms, which include synaptic dysfunction and synaptotoxicity, as well as glial activation and astrogliosis. Astrogliosis is linked to synapse function via the tripartite synapse, but astrocytes also control the availability of gliotransmitters and adenosine. Here we will specifically focus on the ‘adenosine hypothesis of comorbidities’ implying that astrocyte activation, via overexpression of adenosine kinase (ADK), induces a deficiency in the homeostatic tone of adenosine. We present evidence from patient-derived samples showing astrogliosis and overexpression of ADK as common pathological hallmark of epilepsy, AD, PD, and ALS. We discuss a transgenic ‘comorbidity model’, in which brain-wide overexpression of ADK and resulting adenosine deficiency produces a comorbid spectrum of seizures, altered dopaminergic function, attentional impairment, and deficits in cognitive domains and sleep regulation. We conclude that dysfunction of adenosine signaling is common in neurological conditions, that adenosine dysfunction can explain comorbid phenotypes, and that therapeutic adenosine augmentation might be effective for the treatment of comorbid symptoms in multiple neurological conditions. PMID:25979489

  7. Endogenous adenosine curtails lipopolysaccharide-stimulated tumour necrosis factor synthesis

    NARCIS (Netherlands)

    Eigler, A; Greten, T F; Sinha, B; Haslberger, C; Sullivan, G W; Endres, S

    1997-01-01

    Recent studies have demonstrated the inhibitory effect of exogenous adenosine on TNF production. During inflammation endogenous adenosine levels are elevated and may be one of several anti-inflammatory mediators that reduce TNF synthesis. In the present study the authors investigated this role of ad

  8. Olimpíadas e geopolítica

    Directory of Open Access Journals (Sweden)

    João Fábio Bertonha

    2008-09-01

    Full Text Available

    o artigo trata de competições esportivas,

    em especial as olimpíadas. Nelas, valorizam-se o

    nacionalismo e o poder dos países.

  9. Extracting Objects from Ada83 Programs: A Case Study

    Institute of Scientific and Technical Information of China (English)

    XU Baowen; ZHOU Yuming

    2001-01-01

    Reengineering legacy systems written in conventional procedural languages to equivalent OO systems makes software more maintainable and reliable. This paper proposes a method for extracting objects from legacy Ada83 systems using module features. First, metrics are developed to measure module cohesion. Then, effects on cohesion from changing module components are analyzed and rules about how to extract inheritance relations among objects are given. At the end of this paper, an object-extracting algorithm using module features is proposed.

  10. AN ADA LINEAR ALGEBRA PACKAGE MODELED AFTER HAL/S

    Science.gov (United States)

    Klumpp, A. R.

    1994-01-01

    This package extends the Ada programming language to include linear algebra capabilities similar to those of the HAL/S programming language. The package is designed for avionics applications such as Space Station flight software. In addition to the HAL/S built-in functions, the package incorporates the quaternion functions used in the Shuttle and Galileo projects, and routines from LINPAK that solve systems of equations involving general square matrices. Language conventions in this package follow those of HAL/S to the maximum extent practical and minimize the effort required for writing new avionics software and translating existent software into Ada. Valid numeric types in this package include scalar, vector, matrix, and quaternion declarations. (Quaternions are fourcomponent vectors used in representing motion between two coordinate frames). Single precision and double precision floating point arithmetic is available in addition to the standard double precision integer manipulation. Infix operators are used instead of function calls to define dot products, cross products, quaternion products, and mixed scalar-vector, scalar-matrix, and vector-matrix products. The package contains two generic programs: one for floating point, and one for integer. The actual component type is passed as a formal parameter to the generic linear algebra package. The procedures for solving systems of linear equations defined by general matrices include GEFA, GECO, GESL, and GIDI. The HAL/S functions include ABVAL, UNIT, TRACE, DET, INVERSE, TRANSPOSE, GET, PUT, FETCH, PLACE, and IDENTITY. This package is written in Ada (Version 1.2) for batch execution and is machine independent. The linear algebra software depends on nothing outside the Ada language except for a call to a square root function for floating point scalars (such as SQRT in the DEC VAX MATHLIB library). This program was developed in 1989, and is a copyrighted work with all copyright vested in NASA.

  11. The INTEL 432/670 and ADA Performance Benchmarks.

    Science.gov (United States)

    1982-12-01

    a QUICK.MSE"); with text4-io,imtio~guicksort; use texto -io,intio,quicksort; package body OUICKSORT is procedure SORT(1eft~ri(3ht : in subimt; arg...time and ’fuss’, A knowledge of ADA is assumed, as is familiarity with VMS (e.g. the VMS editor ), Referring back to Figure(63 it can be seen that a

  12. Adenosine Receptors: Expression, Function and Regulation

    Directory of Open Access Journals (Sweden)

    Sandeep Sheth

    2014-01-01

    Full Text Available Adenosine receptors (ARs comprise a group of G protein-coupled receptors (GPCR which mediate the physiological actions of adenosine. To date, four AR subtypes have been cloned and identified in different tissues. These receptors have distinct localization, signal transduction pathways and different means of regulation upon exposure to agonists. This review will describe the biochemical characteristics and signaling cascade associated with each receptor and provide insight into how these receptors are regulated in response to agonists. A key property of some of these receptors is their ability to serve as sensors of cellular oxidative stress, which is transmitted by transcription factors, such as nuclear factor (NF-κB, to regulate the expression of ARs. Recent observations of oligomerization of these receptors into homo- and heterodimers will be discussed. In addition, the importance of these receptors in the regulation of normal and pathological processes such as sleep, the development of cancers and in protection against hearing loss will be examined.

  13. Software tools to aid Pascal and Ada program design

    Energy Technology Data Exchange (ETDEWEB)

    Jankowitz, H.T.

    1987-01-01

    This thesis describes a software tool which analyses the style and structure of Pascal and Ada programs by ensuring that some minimum design requirements are fulfilled. The tool is used in much the same way as a compiler is used to teach students the syntax of a language, only in this case issues related to the design and structure of the program are of paramount importance. The tool operates by analyzing the design and structure of a syntactically correct program, automatically generating a report detailing changes that need to be made in order to ensure that the program is structurally sound. The author discusses how the model gradually evolved from a plagiarism detection system which extracted several measurable characteristics in a program to a model that analyzed the style of Pascal programs. In order to incorporate more-sophistical concepts like data abstraction, information hiding and data protection, this model was then extended to analyze the composition of Ada programs. The Ada model takes full advantage of facilities offered in the language and by using this tool the standard and quality of written programs is raised whilst the fundamental principles of program design are grasped through a process of self-tuition.

  14. Beyond SHM and CSR: AID and related cytidine deaminases in the host response to viral infection.

    Science.gov (United States)

    Rosenberg, Brad R; Papavasiliou, F Nina

    2007-01-01

    As the primary effector of immunoglobulin somatic hypermutation (SHM) and class switch recombination (CSR), activation-induced cytidine deaminase (AID) serves an important function in the adaptive immune response. Recent advances have demonstrated that AID and a group of closely related cytidine deaminases, the APOBEC3 proteins, also act in the innate host response to viral infection. Antiviral activity was first attributed to APOBEC3G as a potent inhibitor of HIV. It is now apparent that the targets of the APOBEC3 proteins extend beyond HIV, with family members acting against a wide variety of viruses as well as host-encoded retrotransposable genetic elements. Although it appears to function through a different mechanism, AID also possesses antiviral properties. Independent of its antibody diversification functions, AID protects against transformation by Abelson murine leukemia virus (Ab-MLV), an oncogenic retrovirus. Additionally, AID has been implicated in the host response to other pathogenic viruses. These emerging roles for the AID/APOBEC cytidine deaminases in viral infection suggest an intriguing evolutionary connection of innate and adaptive immune mechanisms.

  15. A High-Affinity Adenosine Kinase from Anopheles Gambiae

    Energy Technology Data Exchange (ETDEWEB)

    M Cassera; M Ho; E Merino; E Burgos; A Rinaldo-Matthis; S Almo; V Schramm

    2011-12-31

    Genome analysis revealed a mosquito orthologue of adenosine kinase in Anopheles gambiae (AgAK; the most important vector for the transmission of Plasmodium falciparum in Africa). P. falciparum are purine auxotrophs and do not express an adenosine kinase but rely on their hosts for purines. AgAK was kinetically characterized and found to have the highest affinity for adenosine (K{sub m} = 8.1 nM) of any known adenosine kinase. AgAK is specific for adenosine at the nucleoside site, but several nucleotide triphosphate phosphoryl donors are tolerated. The AgAK crystal structure with a bound bisubstrate analogue Ap{sub 4}A (2.0 {angstrom} resolution) reveals interactions for adenosine and ATP and the geometry for phosphoryl transfer. The polyphosphate charge is partly neutralized by a bound Mg{sup 2+} ion and an ion pair to a catalytic site Arg. The AgAK structure consists of a large catalytic core in a three-layer {alpha}/{beta}/{alpha} sandwich, and a small cap domain in contact with adenosine. The specificity and tight binding for adenosine arise from hydrogen bond interactions of Asn14, Leu16, Leu40, Leu133, Leu168, Phe168, and Thr171 and the backbone of Ile39 and Phe168 with the adenine ring as well as through hydrogen bond interactions between Asp18, Gly64, and Asn68 and the ribosyl 2'- and 3'-hydroxyl groups. The structure is more similar to that of human adenosine kinase (48% identical) than to that of AK from Toxoplasma gondii (31% identical). With this extraordinary affinity for AgAK, adenosine is efficiently captured and converted to AMP at near the diffusion limit, suggesting an important role for this enzyme in the maintenance of the adenine nucleotide pool. mRNA analysis verifies that AgAK transcripts are produced in the adult insects.

  16. Prevention of adenosine A2A receptor activation diminishes beat-to-beat alternation in human atrial myocytes.

    Science.gov (United States)

    Molina, Cristina E; Llach, Anna; Herraiz-Martínez, Adela; Tarifa, Carmen; Barriga, Montserrat; Wiegerinck, Rob F; Fernandes, Jacqueline; Cabello, Nuria; Vallmitjana, Alex; Benitéz, Raúl; Montiel, José; Cinca, Juan; Hove-Madsen, Leif

    2016-01-01

    Atrial fibrillation (AF) has been associated with increased spontaneous calcium release from the sarcoplasmic reticulum and linked to increased adenosine A2A receptor (A2AR) expression and activation. Here we tested whether this may favor atrial arrhythmogenesis by promoting beat-to-beat alternation and irregularity. Patch-clamp and confocal calcium imaging was used to measure the beat-to-beat response of the calcium current and transient in human atrial myocytes. Responses were classified as uniform, alternating or irregular and stimulation of Gs-protein coupled receptors decreased the frequency where a uniform response could be maintained from 1.0 ± 0.1 to 0.6 ± 0.1 Hz; p < 0.01 for beta-adrenergic receptors and from 1.4 ± 0.1 to 0.5 ± 0.1 Hz; p < 0.05 for A2ARs. The latter was linked to increased spontaneous calcium release and after-depolarizations. Moreover, A2AR activation increased the fraction of non-uniformly responding cells in HL-1 myocyte cultures from 19 ± 3 to 51 ± 9 %; p < 0.02, and electrical mapping in perfused porcine atria revealed that adenosine induced electrical alternans at longer cycle lengths, doubled the fraction of electrodes showing alternation, and increased the amplitude of alternations. Importantly, protein kinase A inhibition increased the highest frequency where uniform responses could be maintained from 0.84 ± 0.12 to 1.86 ± 0.11 Hz; p < 0.001 and prevention of A2AR-activation with exogenous adenosine deaminase selectively increased the threshold from 0.8 ± 0.1 to 1.2 ± 0.1 Hz; p = 0.001 in myocytes from patients with AF. In conclusion, A2AR-activation promotes beat-to-beat irregularities in the calcium transient in human atrial myocytes, and prevention of A2AR activation may be a novel means to maintain uniform beat-to-beat responses at higher beating frequencies in patients with atrial fibrillation.

  17. Vasoconstrictor and vasodilator effects of adenosine in the kidney

    DEFF Research Database (Denmark)

    Hansen, Pernille B; Schnermann, Jurgen

    2003-01-01

    Adenosine is an ATP breakdown product that in most vessels causes vasodilatation and that contributes to the metabolic control of organ perfusion, i.e., to the match between oxygen demand and oxygen delivery. In the renal vasculature, in contrast, adenosine can produce vasoconstriction, a respons...... activation from changes in vascular adenosine concentration, a characteristic that is ideally suited for the role of renal adenosine as a paracrine factor in the control of glomerular function.......Adenosine is an ATP breakdown product that in most vessels causes vasodilatation and that contributes to the metabolic control of organ perfusion, i.e., to the match between oxygen demand and oxygen delivery. In the renal vasculature, in contrast, adenosine can produce vasoconstriction, a response...... that has been suggested to be an organ-specific version of metabolic control designed to restrict organ perfusion when transport work increases. However, the vasoconstriction elicited by an intravenous infusion of adenosine is only short lasting, being replaced within 1-2 min by vasodilatation. It appears...

  18. Increased Cortical Extracellular Adenosine Correlates with Seizure Termination

    Science.gov (United States)

    Van Gompel, Jamie J.; Bower, Mark R.; Worrell, Gregory A.; Stead, Matt; Chang, Su-Youne; Goerss, Stephan J.; Kim, Inyong; Bennet, Kevin E.; Meyer, Fredric B.; Marsh, W. Richard; Blaha, Charles D.; Lee, Kendall H.

    2014-01-01

    Objective Seizures are currently defined by their electrographic features. However, neuronal networks are intrinsically dependent upon neurotransmitters of which little is known regarding their peri-ictal dynamics. Evidence supports adenosine as having a prominent role in seizure termination, as its administration can terminate and reduce seizures in animal models. Further, microdialysis studies in humans suggest adenosine is elevated peri-ictally, but the relationship to the seizure is obscured by its temporal measurement limitations. Because electrochemical techniques can provide vastly superior temporal resolution, we test the hypothesis that extracellular adenosine concentrations rise during seizure termination in an animal model and humans using electrochemistry. Methods White farm swine (n=45) were used in an acute cortical model of epilepsy and 10 human epilepsy patients were studied during intraoperative electrocorticography (Ecog). Wireless Instantaneous Neurotransmitter Concentration Sensor (WINCS) based fast scan cyclic voltametry (FSCV) and fixed potential amperometry were obtained utilizing an adenosine specific triangular waveform or biosensors respectively. Results Simultaneous Ecog and electrochemistry demonstrated an average adenosine rise of 260% compared to baseline at 7.5 ± 16.9 seconds with amperometry (n=75 events) and 2.6 ± 11.2 seconds with FSCV (n=15 events) prior to electrographic seizure termination. In agreement with these animal data, adenosine elevation prior to seizure termination in a human patient utilizing FSCV was also seen. Significance Simultaneous Ecog and electrochemical recording supports the hypothesis that adenosine rises prior to seizure termination, suggesting that adenosine itself may be responsible for seizure termination. Future work using intraoperative WINCS based FSCV recording may help to elucidate the precise relationship between adenosine and seizure termination. PMID:24483230

  19. Adenosine and Preexcitation Variants: Reappraisal of Electrocardiographic Changes.

    Science.gov (United States)

    Ali, Hussam; Lupo, Pierpaolo; Foresti, Sara; De Ambroggi, Guido; Epicoco, Gianluca; Fundaliotis, Angelica; Cappato, Riccardo

    2016-07-01

    Intravenous adenosine is a short-acting blocker of the atrioventricular node that has been used to unmask subtle or latent preexcitation, and also to enable catheter ablation in selected patients with absent or intermittent preexcitation. Depending on the accessory pathway characteristics, intravenous adenosine may produce specific electrocardiographic changes highly suggestive of the preexcitation variant. Herein, we view different ECG responses to this pharmacological test in various preexcitation patterns that were confirmed by electrophysiological studies. Careful analysis of electrocardiographic changes during adenosine test, with emphasis on P-delta interval, preexcitation degree, and atrioventricular block, can be helpful to diagnose the preexcitation variant/pattern.

  20. Isolation and characterization of ACC deaminase-producing fluorescent pseudomonads, to alleviate salinity stress on canola (Brassica napus L.) growth.

    Science.gov (United States)

    Jalili, Farzad; Khavazi, Kazem; Pazira, Ebrahim; Nejati, Alireza; Rahmani, Hadi Asadi; Sadaghiani, Hasan Rasuli; Miransari, Mohammad

    2009-04-01

    Salinity stress is of great importance in arid and semi-arid areas of the world due to its impact in reducing crop yield. Under salinity stress, the amount of 1-aminocyclopropane-1-carboxylate (ACC), a precursor for ethylene production in plants, increases. Here, we conducted research under the hypothesis that isolated ACC deaminase-producing Pseudomonas fluorescens and Pseudomonas putida can alleviate the stressful effects of salinity on canola (Brassica napus L.) growth. The experiments were conducted in the Soil and Water Research Institute, Tehran, Iran. Seven experimental stages were conducted to isolate and characterize ACC deaminase-producing Pseudomonas fluorescens strains and to determine factors enhancing their growth and, consequently, their effects on the germination of canola seeds. Under salinity stress, in 14% of the isolates, ACC deaminase activity was observed, indicating that they were able to utilize ACC as the sole N-source. Bacterial strains differed in their ability to synthesize auxin and hydrogen cyanide compounds, as well as in their ACC deaminase activity. Under salinity stress, the rate of germinating seeds inoculated with the strains of ACC deaminase-producing Pseudomonas fluorescens and Pseudomonas putida, and seedling growth was significantly higher. These results indicate the significance of soil biological activities, including the activities of plant growth-promoting bacteria, in the alleviation of soil stresses such as salinity on plant growth.

  1. Potent inhibitors for the deamination of cytosine arabinoside and 5-aza-2'-deoxycytidine by human cytidine deaminase.

    Science.gov (United States)

    Laliberté, J; Marquez, V E; Momparler, R L

    1992-01-01

    Deamination of the nucleoside analogues ARA-C and 5-AZA-CdR by CR deaminase results in a loss of antileukemic activity. To prevent the inactivation of these analogues, inhibitors of CR deaminase may prove to be useful agents. In the present study we investigated the effects of the deaminase inhibitors Zebularine, 5-F-Zebularine, and diazepinone riboside on the deamination of CR, ARA-C, and 5-AZA-CdR using highly purified human CR deaminase (EC 3.5.4.5). These inhibitors produced a competitive type of inhibition with each substrate, the potency of which followed the patterns diazepinone riboside greater than 5-F-Zebularine and THU greater than Zebularine. 5-AZA-CdR was more sensitive than ARA-C to the inhibition produced by these deaminase inhibitors. The inhibition constants for diazepinone riboside lay in the range of 5-15 nM, suggesting that this inhibitor could be an excellent candidate for use in combination chemotherapy with either ARA-C or 5-AZA-CdR in patients with leukemia.

  2. Large distributed control system using ADA in fusion research

    Energy Technology Data Exchange (ETDEWEB)

    Woodruff, J. P., LLNL

    1998-04-21

    Construction of the National Ignition Facility laser at Lawrence Livermore National Laboratory features a large distributed control system constructed using object-oriented software engineering techniques. Control of 60,000 devices is effected using a network of some 500 computers that run software written in Ada and communicating through CORBA. The project has completed its final design review; implementation of the first of five planned increments will be delivered at the end of fiscal year 1998. Preliminary measures of the distributed controls performance confirm the design decisions reported in this paper, and the measurement and supporting simulation of full system performance continue.

  3. Automated flare prediction using the AdaBoost algorithm

    Institute of Scientific and Technical Information of China (English)

    Ru-Shi Lan; Yong Jiang; Liu-Guan Ding; Jian-Wei Yang

    2012-01-01

    We propose a flare prediction method based on the AdaBoost algorithm,which constructs a strong prediction model from a combination of several basic models.Three predictors,extracted from the photospheric magnetograms,are applied as features to predict the occurrence of flares with a certain level over 24 hours following the time when the magnetogram is recorded.To demonstrate the effectiveness of the proposed method,comparisons of experimental results with respect to some existing methods are given.The results show that an improvement is achieved in predicting the occurrences of large flares.

  4. ADaPPT: Enterprise Architecture Thinking for Information Systems Development

    Directory of Open Access Journals (Sweden)

    Hanifa Shah

    2011-01-01

    Full Text Available Enterprises have architecture: whether it is visible or invisible is another matter. An enterprises' architecture determines the way in which it works to deliver its business objectives and the way in which it can change to continue to meet its evolving business objectives. Enterprise architectural thinking can facilitate effective strategic planning and information systems development. This paper reviews enterprise architecture (EA and its concepts. It briefly considers EA frameworks. It describes the ADaPPT (Aligning Data, People, Processes and Technology EA approach as a means to managing organisational complexity and change. Future research directions are discussed.

  5. Event-based Implicit Invocation Decentralized in Ada

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Nowadays more and more attraction is drawn by the event-basedimplicit invocation - one of useful architectural patterns, because of its loose couplin g between components in the architecture and reactive integration in software sys tems. Analyzing object-oriented interaction with objects, this paper, based upo n the principle of software architecture, presents an approach on event-based ob j ect model with Ada exception handler. Consequently it is possible for us to impr ove, with adding specific architectural patterns, traditional programming langua ges into architectural description languages.

  6. Possible mechanism of adenosine protection in carbon tetrachloride acute hepatotoxicity. Role of adenosine by-products and glutathione peroxidase.

    Science.gov (United States)

    Chagoya de Sánchez, V; Hernández-Muñoz, R; Yáñez, L; Vidrio, S; Díaz-Muñoz, M

    1995-02-01

    Adenosine proved to be an effective hepatoprotector increasing the survival rate of rats receiving lethal doses of CCl4. Searching for the mechanism of action, we found that adenosine transiently prevents the necrotic liver damage associated to an acute CCl4 treatment. The antilipoperoxidative action of the nucleoside was evidenced by a decrease of TBA-reactive products and the diene conjugates elicited by the hepatotoxin. Adenosine's protective effect was demonstrated by reverting the decrease of cytochrome P-450 while preserved intact the activity of the microsomal enzyme glucose-6-phosphatase. CCl4 promoted an increase in the oxidant stress through an enhancement in oxidized glutathione levels. This action was also completely counteracted by the nucleoside. Adenosine was unable to prevent CCl4 activation and, even, increased .CCl3 formation in the presence of PBN in vivo. However, in the presence of the nucleoside, irreversible binding of 14CCl4 to the microsomal lipid fraction of the treated animals was decreased. These results suggest that adenosine protective action might be exerted at the level of the propagation reaction following CCl4 activation. Two possible mechanisms were associated to the nucleoside protection: (1) the peroxide-metabolyzed enzymes, GSH-per, showed a marked increase after 30 minutes of adenosine treatment, which was potentiated by the hepatotoxin, suggesting an important role of this enzyme in the nucleoside's action; (2) the adenosine catabolism induced an increase in uric acid level, and allopurinol, a purine metabolism inhibitor, prevented such elevation as well as the antilipoperoxidative action of adenosine and the increase of GSH-per associated with the nucleoside treatment. These facts strongly suggest that the protective effect elicited by adenosine is not a direct one, but rather is related to its catabolic products, such as uric acid, which has been recognized as a free radical scavenger.

  7. TCP-ADaLR: TCP with adaptive delay and loss response for broadband GEO satellite networks

    OpenAIRE

    Omueti, Modupe Omogbohun

    2007-01-01

    Transmission Control Protocol (TCP) performance degrades in broadband geostationary satellite networks due to long propagation delays and high bit error rates. In this thesis, we propose TCP with algorithm modifications for adaptive delay and loss response (TCP-ADaLR) to improve TCP performance. TCP-ADaLR incorporates delayed acknowledgement mechanism recommended for Internet hosts. We evaluate and compare the performance of TCP-ADaLR, TCP SACK, and TCP NewReno, with and without delayed ackno...

  8. Rosuvastatin increases extracellular adenosine formation in humans in vivo: a new perspective on cardiovascular protection.

    OpenAIRE

    Meijer, P; Oyen, W.J.G.; Dekker, D.; Broek, P.H.H. van den; Wouters, C.W.; Boerman, O.C.; Scheffer, G. J.; Smits, P; Rongen, G.A.P.J.M.

    2009-01-01

    OBJECTIVE: Statins may increase extracellular adenosine formation from adenosine monophosphate by enhancing ecto-5'-nucleotidase activity. This theory was tested in humans using dipyridamole-induced vasodilation as a read-out for local adenosine formation. Dipyridamole inhibits the transport of extracellular adenosine into the cytosol resulting in increased extracellular adenosine and subsequent vasodilation. In addition, we studied the effect of statin therapy in a forearm model of ischemia-...

  9. Inhibition of uptake of adenosine into human blood platelets

    NARCIS (Netherlands)

    Lips, J.P.M.; Sixma, J.J.; Trieschnigg, A.C.

    1980-01-01

    Adenosine transport into human blood platelets is mediated by two independent systems with different affinities. Both systems transport only purine nucleosides and no pyrimidine nucleosides. In experiments with differently substituted purine nucleosides, purines and analogues, differences in carrier

  10. TRW’s Ada Process Model for Incremental Development of Large Software Systems

    Science.gov (United States)

    1990-01-01

    TRW’s Ada Process Model has proven to be key to the Command Center Processing and Display System-Replacement (CCPDS-R) project’s success to data in...developing over 3000,000 lines of Ada source code executing in a distributed VAX VMS environment. The Ada Process Model is, in simplest terms, a...software progress metrics. This paper provides an overview of the techniques and benefits of the Ada Process Model and describes some of the experience and

  11. Screening of Rhizosphere Bacteria From Rice Fields in The Coastal Area as Acc-Deaminase and Auxin Producer

    Directory of Open Access Journals (Sweden)

    Annisyia Zarina Putri

    2015-02-01

    Full Text Available Salinity and drought stress results in the production of ethylene. Rhizosphere bacterial activity suppresses the production of ethylene through the activity of 1-aminocycopropane-1-carboxylate (ACC deaminase. In this study,a sampel of rhizosphere bacteria from coastal rice plant area was tested. The method used was acc deaminase activity test performed on Dworkin - Foster (DF media and PCR acdS gene using specific primers of ACC and a quantitative analysis of the production of auxin (IAA. Of 47 isolatees obtained, 8 were positively have acdS activity. The positive result was indicated by the presence of 1080 bp amplicon. Quantitative analysisshowed the highest yield of 10.6 ppm of auxin. The results prove that there are some bacteria originated from coastal rice plant area which have acc deaminase activity.

  12. Low-dose adenosine stress echocardiography: Detection of myocardial viability

    Science.gov (United States)

    Djordjevic-Dikic, Ana; Ostojic, Miodrag; Beleslin, Branko; Nedeljkovic, Ivana; Stepanovic, Jelena; Stojkovic, Sinisa; Petrasinovic, Zorica; Nedeljkovic, Milan; Saponjski, Jovica; Giga, Vojislav

    2003-01-01

    Objective The aim of this study was to evaluate the diagnostic potential of low-dose adenosine stress echocardiography in detection of myocardial viability. Background Vasodilation through low dose dipyridamole infusion may recruit contractile reserve by increasing coronary flow or by increasing levels of endogenous adenosine. Methods Forty-three patients with resting dyssynergy, due to previous myocardial infarction, underwent low-dose adenosine (80, 100, 110 mcg/kg/min in 3 minutes intervals) echocardiography test. Gold standard for myocardial viability was improvement in systolic thickening of dyssinergic segments of ≥ 1 grade at follow-up. Coronary angiography was done in 41 pts. Twenty-seven patients were revascularized and 16 were medically treated. Echocardiographic follow up data (12 ± 2 months) were available in 24 revascularized patients. Results Wall motion score index improved from rest 1.55 ± 0.30 to 1.33 ± 0.26 at low-dose adenosine (p < 0.001). Of the 257 segments with baseline dyssynergy, adenosine echocardiography identified 122 segments as positive for viability, and 135 as necrotic since no improvement of systolic thickening was observed. Follow-up wall motion score index was 1.31 ± 0.30 (p < 0.001 vs. rest). The sensitivity of adenosine echo test for identification of viable segments was 87%, while specificity was 95%, and diagnostic accuracy 90%. Positive and negative predictive values were 97% and 80%, respectively. Conclusion Low-dose adenosine stress echocardiography test has high diagnostic potential for detection of myocardial viability in the group of patients with left ventricle dysfunction due to previous myocardial infarction. Low dose adenosine stress echocardiography may be adequate alternative to low-dose dobutamine test for evaluation of myocardial viability. PMID:12812523

  13. O tempo na terceira Enéada de Plotino

    Directory of Open Access Journals (Sweden)

    Daniel Schiochett

    2009-06-01

    Full Text Available Plotino é conhecido pela doutrina das três hipóstases: o Uno, a Inteligência e a Alma. Enquanto neoplatônico, sua doutrina é pensada a partir da visão platônica do mundo. Todavia, na terceira Enéada o filósofo se põe a discutir longamente a concepção antiga do tempo, fortemente devedora da doutrina aristotélica. Plotino, ao seu modo, consegue reinterpretar e adequar a noção aristotélica do tempo à concepção de mundo platônica. O tempo, para Plotino, por um lado, permanece referido ao movimento, concordando com Aristóteles, e por outro, é imagem de uma outra forma mais perfeira, a eternidade, concordando com a divisão do mundo em sensivel e supra-sensível de Platão. Por conseguir compreender o tempo a partir desses dois registros, o platônico e o aristotélico, Plotino figura como um ponto importante para se compreender as teorias do tempo que vieram depois dele, principalmente a de Santo Agostinho. Nosso ensaio pretende discutir a noção de tempo em Plotino, a partir da terceira Enéada, a fim de fornecer instrumentos para tal compreensão.

  14. Biochemistry and Genetics of ACC deaminase: A weapon to 'stress ethylene' produced in plants

    Directory of Open Access Journals (Sweden)

    Rajnish Prakash Singh

    2015-09-01

    Full Text Available 1-aminocyclopropane-1-carboxylate deaminase (ACCD, a pyridoxal phosphate dependent enzyme, is widespread in diverse bacterial and fungal species. Owing to ACCD activity, certain plant associated bacteria help plant to grow under biotic and abiotic stresses by decreasing level of 'stress ethylene' which is inhibitory to plant growth. ACCD breaks down ACC, an immediate precursor of ethylene, to ammonia and α-ketobutyrate which can be further metabolized by bacteria for their growth. ACC deaminase is an inducible enzyme whose synthesis is induced in presence of its substrate ACC. This enzyme, encoded by gene AcdS, is under tight regulation and regulated differentilly under different environmental conditions. Regulatory elements of gene AcdS are comprised of regulatory gene encoding LRP protein and other regulator elements which are activated differentially under aerobic and anaerobic conditions. Role of some additional regulatory genes such as AcdB or LysR may also be required for expression of AcdS. Phylogenetic analysis of AcdS has revealed that distribution of this gene among different bacteria might have resulted from vertical gene transfer with occasional horizontal gene transfer. Application of bacterial AcdS gene has been extended by developing transgenic plants with ACCD gene which showed increased tolerance to biotic and abiotic stresses in plants. Moreover, distribution of ACCD gene or its homologs in wide range of species belonging to all three domains indicate alternative role of ACCD in physiology of an organism. Therefore, this review is an attempt to explore current knowledge of bacterial ACC deaminase mediated physiological effects in plants, mode of enzyme action, genetics, and distribution in different species and ecological role of ACCD and, future research avenues to develop transgenic plants expressing foreign AcdS gene to cope with biotic and abiotic stressors. Systemic identification of regulatory circuits would be highly

  15. Significance of the D-serine-deaminase and D-serine metabolism of Staphylococcus saprophyticus for virulence.

    Science.gov (United States)

    Korte-Berwanger, Miriam; Sakinc, Türkan; Kline, Kimberly; Nielsen, Hailyn V; Hultgren, Scott; Gatermann, Sören G

    2013-12-01

    Staphylococcus saprophyticus is the only species of Staphylococcus that is typically uropathogenic and possesses a gene coding for a D-serine-deaminase (DsdA). As D-serine is prevalent in urine and toxic or bacteriostatic to many bacteria, it is not surprising that the D-serine-deaminase gene is found in the genome of uropathogens. It has been suggested that D-serine-deaminase or the ability to respond to or to metabolize D-serine is important for virulence. For uropathogenic Escherichia coli (UPEC), a high intracellular D-serine concentration affects expression of virulence factors. S. saprophyticus is able to grow in the presence of high D-serine concentrations; however, its D-serine metabolism has not been described. The activity of the D-serine-deaminase was verified by analyzing the formation of pyruvate from D-serine in different strains with and without D-serine-deaminase. Cocultivation experiments were performed to show that D-serine-deaminase confers a growth advantage to S. saprophyticus in the presence of D-serine. Furthermore, in vivo coinfection experiments showed a disadvantage for the ΔdsdA mutant during urinary tract infection. Expression analysis of known virulence factors by reverse transcription-quantitative PCR (RT-qPCR) showed that the surface-associated lipase Ssp is upregulated in the presence of D-serine. In addition, we show that S. saprophyticus is able to use D-serine as the sole carbon source, but interestingly, D-serine had a negative effect on growth when glucose was also present. Taken together, D-serine metabolism is associated with virulence in S. saprophyticus, as at least one known virulence factor is upregulated in the presence of D-serine and a ΔdsdA mutant was attenuated in virulence murine model of urinary tract infection.

  16. The A3 adenosine receptor: history and perspectives.

    Science.gov (United States)

    Borea, Pier Andrea; Varani, Katia; Vincenzi, Fabrizio; Baraldi, Pier Giovanni; Tabrizi, Mojgan Aghazadeh; Merighi, Stefania; Gessi, Stefania

    2015-01-01

    By general consensus, the omnipresent purine nucleoside adenosine is considered a major regulator of local tissue function, especially when energy supply fails to meet cellular energy demand. Adenosine mediation involves activation of a family of four G protein-coupled adenosine receptors (ARs): A(1), A(2)A, A(2)B, and A(3). The A(3) adenosine receptor (A(3)AR) is the only adenosine subtype to be overexpressed in inflammatory and cancer cells, thus making it a potential target for therapy. Originally isolated as an orphan receptor, A(3)AR presented a twofold nature under different pathophysiologic conditions: it appeared to be protective/harmful under ischemic conditions, pro/anti-inflammatory, and pro/antitumoral depending on the systems investigated. Until recently, the greatest and most intriguing challenge has been to understand whether, and in which cases, selective A(3) agonists or antagonists would be the best choice. Today, the choice has been made and A(3)AR agonists are now under clinical development for some disorders including rheumatoid arthritis, psoriasis, glaucoma, and hepatocellular carcinoma. More specifically, the interest and relevance of these new agents derives from clinical data demonstrating that A(3)AR agonists are both effective and safe. Thus, it will become apparent in the present review that purine scientists do seem to be getting closer to their goal: the incorporation of adenosine ligands into drugs with the ability to save lives and improve human health.

  17. Low-dose adenosine stress echocardiography: Detection of myocardial viability

    Directory of Open Access Journals (Sweden)

    Nedeljkovic Milan

    2003-06-01

    Full Text Available Abstract Objective The aim of this study was to evaluate the diagnostic potential of low-dose adenosine stress echocardiography in detection of myocardial viability. Background Vasodilation through low dose dipyridamole infusion may recruit contractile reserve by increasing coronary flow or by increasing levels of endogenous adenosine. Methods Forty-three patients with resting dyssynergy, due to previous myocardial infarction, underwent low-dose adenosine (80, 100, 110 mcg/kg/min in 3 minutes intervals echocardiography test. Gold standard for myocardial viability was improvement in systolic thickening of dyssinergic segments of ≥ 1 grade at follow-up. Coronary angiography was done in 41 pts. Twenty-seven patients were revascularized and 16 were medically treated. Echocardiographic follow up data (12 ± 2 months were available in 24 revascularized patients. Results Wall motion score index improved from rest 1.55 ± 0.30 to 1.33 ± 0.26 at low-dose adenosine (p Conclusion Low-dose adenosine stress echocardiography test has high diagnostic potential for detection of myocardial viability in the group of patients with left ventricle dysfunction due to previous myocardial infarction. Low dose adenosine stress echocardiography may be adequate alternative to low-dose dobutamine test for evaluation of myocardial viability.

  18. Structural, kinetic, and mutational studies of the zinc ion environment in tetrameric cytidine deaminase

    DEFF Research Database (Denmark)

    Johansson, Eva; Neuhard, Jan; Willemoës, Martin

    2004-01-01

    The zinc-containing cytidine deaminase (CDA, EC 3.5.4.5) is a pyrimidine salvage enzyme catalyzing the hydrolytic deamination of cytidine and 2'-deoxycytidine forming uridine and 2'-deoxyuridine, respectively. Homodimeric CDA (D-CDA) and homotetrameric CDA (T-CDA) both contain one zinc ion per...... with the dipole moments from two alpha-helices partially neutralizes the additional negative charge in the active site, leading to a catalytic activity similar to D-CDA. Arg56 has been substituted by a glutamine (R56Q), the corresponding residue in D-CDA, an alanine (R56A), and an aspartate (R56D). Moreover, one...

  19. Synthesis of conformationally locked carbocyclic 1,3-diazepinone nucleosides as inhibitors of cytidine deaminase.

    Science.gov (United States)

    Ludek, Olaf R; Schroeder, Gottfried K; Wolfenden, Richard; Marquez, Victor E

    2008-01-01

    We synthesized a series of carbocyclic nucleoside inhibitors of cytidine deaminase (CDA) based on a seven-membered 1,3-diazepin-2-one moiety. In the key step, the seven-membered ring was formed by a ring-closing-metathesis reaction. Therefore, the bis-allyl-urea moiety had to be protected by benzoylation in order to obtain an orientation suitable for ring closure. To our surprise, the analogue built on a flexible sugar template (4) showed a 100-fold stronger inhibition of CDA than the derivative with the preferred south-conformation.

  20. Synthesis of conformationally locked carbocyclic 1,3-diazepinone nucleosides as inhibitors of cytidine deaminase

    OpenAIRE

    Ludek, Olaf R.; Schroeder, Gottfried K.; Wolfenden, Richard; Marquez, Victor E.

    2008-01-01

    We synthesized a series of carbocyclic nucleoside inhibitors of cytidine deaminase (CDA) based on a seven-membered 1,3-diazepin-2-one moiety. In the key step, the seven-membered ring was formed by a ringclosing- metathesis reaction. Therefore, the bis-allylurea moiety had to be protected by benzoylation in order to obtain an orientation suitable for ring closure. To our surprise, the analogue built on a flexible sugar template (4) showed a 100-fold stronger inhibition of CDA than the derivati...

  1. 1-(beta-D-Erythrofuranosyl)adenosine.

    Science.gov (United States)

    Kline, Paul C; Zhao, Hongqiu; Noll, Bruce C; Oliver, Allen G; Serianni, Anthony S

    2010-04-01

    The title compound, also known as beta-erythroadenosine, C(9)H(11)N(5)O(3), (I), a derivative of beta-adenosine, (II), that lacks the C5' exocyclic hydroxymethyl (-CH(2)OH) substituent, crystallizes from hot ethanol with two independent molecules having different conformations, denoted (IA) and (IB). In (IA), the furanose conformation is (O)T(1)-E(1) (C1'-exo, east), with pseudorotational parameters P and tau(m) of 114.4 and 42 degrees, respectively. In contrast, the P and tau(m) values are 170.1 and 46 degrees, respectively, in (IB), consistent with a (2)E-(2)T(3) (C2'-endo, south) conformation. The N-glycoside conformation is syn (+sc) in (IA) and anti (-ac) in (IB). The crystal structure, determined to a resolution of 2.0 A, of a cocrystal of (I) bound to the enzyme 5'-fluorodeoxyadenosine synthase from Streptomyces cattleya shows the furanose ring in a near-ideal (O)E (east) conformation (P = 90 degrees and tau(m) = 42 degrees) and the base in an anti (-ac) conformation.

  2. Different efficacy of adenosine and NECA derivatives at the human A3 adenosine receptor: insight into the receptor activation switch.

    Science.gov (United States)

    Dal Ben, Diego; Buccioni, Michela; Lambertucci, Catia; Kachler, Sonja; Falgner, Nico; Marucci, Gabriella; Thomas, Ajiroghene; Cristalli, Gloria; Volpini, Rosaria; Klotz, Karl-Norbert

    2014-01-15

    A3 Adenosine receptors are promising drug targets for a number of diseases and intense efforts are dedicated to develop selective agonists and antagonists of these receptors. A series of adenosine derivatives with 2-(ar)-alkynyl chains, with high affinity and different degrees of selectivity for human A3 adenosine receptors was tested for the ability to inhibit forskolin-stimulated adenylyl cyclase. All these derivatives are partial agonists at A3 adenosine receptors; their efficacy is not significantly modified by the introduction of small alkyl substituents in the N(6)-position. In contrast, the adenosine-5'-N-ethyluronamide (NECA) analogs of 2-(ar)-alkynyladenosine derivatives are full A3 agonists. Molecular modeling analyses were performed considering both the conformational behavior of the ligands and the impact of 2- and 5'-substituents on ligand-target interaction. The results suggest an explanation for the different agonistic behavior of adenosine and NECA derivatives, respectively. A sub-pocket of the binding site was analyzed as a crucial interaction domain for receptor activation.

  3. Ada Compiler Validation Summary Report: Siemens AG Siemens BS2000 Ada Compiler, Version 1.0 Siemens 7.57OP.

    Science.gov (United States)

    1987-02-26

    STD-]815A, FEB 1983. 2. Ada Validation Organization: Policies and Procedures, MITRE Corporation , JUN 1982, PB 83-110601. 3. Ada Compiler Validation...expression’s suhtyne is comnatible with the target’s sub- type. In assigning two-dimensional array types, the expression does not appear to be evaluated...owner’s corporate name. Siemens Aktiengesellschaft -- 7 ,Spa . ’. ’.,,,, .- ’.% ’ " ’ ,-.-,ŗ’/ ,’,’ ’ ’,,- ’ % 3

  4. Ecto- and cytosolic 5'-nucleotidases in normal and AMP deaminase-deficient human skeletal muscle

    DEFF Research Database (Denmark)

    Hanisch, Frank; Hellsten, Ylva; Zierz, Stephan

    2006-01-01

    AMPD1 genotypes [homozygotes for C34T mutation (TT); heterozygotes for C34T mutation (CT); and homozygotes for wild type (CC): diseased controls CC; and normal controls CC]. AMP deaminase activity showed genotype-dependent differences. Total cN activity in normal controls accounted for 57...... homogenate 5'-nucleotidase and ectoN, or in cN-I expression on Western blots. No correlation for age, fibre type distribution and AMPD1 genotype was found for whole homogenate nucleotidase, total cN and cN-I using multiple linear regression analysis. There was no gender-specific difference in the activities...... of whole homogenate nucleotidase, total cN and cN-I. The results indicate no changes in the relative expression or catalytic behaviour of cN-I in AMP deaminase-deficient human skeletal muscle, but suggest that increased turnover of AMP by cN-I in working skeletal muscle is due to higher substrate...

  5. Rhizobacteria containing ACC-deaminase confer salt tolerance in maize grown on salt-affected fields.

    Science.gov (United States)

    Nadeem, Sajid Mahmood; Zahir, Zahir Ahmad; Naveed, Muhammad; Arshad, Muhammad

    2009-11-01

    Salt stress is one of the major constraints hampering agricultural production owing to its impact on ethylene production and nutritional imbalance. A check on the accelerated ethylene production in plants could be helpful in minimizing the negative effect of salt stress on plant growth and development. Four Pseudomonas, 1 Flavobacterium, and 1 Enterobacter strain of plant growth promoting rhizobacteria containing 1-aminocyclopropane-1-carboxylate (ACC)-deaminase were selected and their effects on growth and yield of maize were investigated to improve the salt tolerance of maize grown on salt-affected fields. The selected rhizobacterial isolates reduced or eliminated the classical "triple" response, indicating their ability to reduce stress-induced ethylene levels. Results showed that rhizobacterial strains, particularly Pseudomonas and Enterobacter spp., significantly promoted the growth and yield of maize compared with the non-inoculated control. Pseudomonas fluorescens increased plant height, biomass, cob yield, grain yield, 1000 grain mass, and straw yield of maize up to 29%, 127%, 67%, 60%, 17%, and 166%, respectively, over the control. Under stress conditions, more N, P, and K uptake and high K+-Na+ ratios were recorded in inoculated plants compared with the control. The results imply that inoculation with plant growth promoting rhizobacteria containing ACC-deaminase could be a useful approach for improving growth and yield of maize under salt-stressed conditions.

  6. 基于AdaCostBoost算法的网络钓鱼检测%Phishing Detection System Based on AdaCostBoost Algorithm

    Institute of Scientific and Technical Information of China (English)

    曾传璜; 李思强; 张小红

    2015-01-01

    针对日益严重的网络钓鱼攻击,提出机器学习的方法进行钓鱼网站的检测和判断。首先,根据URL提取敏感特征,然后,采用AdaBoost算法进行训练出分类器,再用训练好的分类器对未知URL检测识别。最后,针对非平衡代价问题,采用了改进后的 AdaBoost 算法--AdaCostBoost,加入代价因子的计算。实验结果表明,文中提出的网络钓鱼检测方法,具有较优的检测性能。%For increasing serious phishing attacks, machine-learning method is proposed to detect phishing webs. Firstly, sensitive features are extracted from the URL, then, using AdaBoost algorithm to get the trained classifier, and then the classifier is used to detect unknown URLs. Finally, considering of non-equilibrium problems of AdaBoost, the paper puts forward the improved learning algorithm called AdaCostBoost, which contains computation of cost factors. According to the experiment result, the proposed phishing detection method has better detection performance.

  7. Cartalk 2000: development of a co-operative ADAS based on vehicle-to-vehicle communication

    NARCIS (Netherlands)

    Morsink, P.L.J.; Hallouzi, R.; Dagli, I.; Cseh, C.; Schäfers, L.; Nelisse, M.W.; Bruin, D. de

    2003-01-01

    Advanced Driver Assistance Systems (ADAS) benefit from using vehicle-to-vehicle communication. In the 5th framework EC project CarTALK2000 co-operative ADAS are designed, tested and evaluated with respect to increasing traffic safety, efficiency and driving comfort. Communication based longitudinal

  8. School Issues Under [Section] 504 and the ADA: The Latest and Greatest.

    Science.gov (United States)

    Aleman, Steven R.

    This paper highlights recent guidance and rulings from the Office of Civil Rights (OCR) of interest to administrators, advocates, and attorneys. It is a companion piece to Student Issues on SectionNB504/ADA: The Latest and Greatest. Compliance with SectionNB504 and the Americans with Disabilities Act (ADA) continues to involve debate and dialog on…

  9. NRPA Law Review. Combat Karate Class Illustrates ADA "Direct Threat" Exception.

    Science.gov (United States)

    Kozlowski, James C.

    2000-01-01

    Describes the Americans with Disabilities Act (ADA), which prohibits discrimination against people with disabilities, highlighting a lawsuit involving a boy with AIDS who was barred from a traditional combat-oriented martial arts school. Courts ruled that his exclusion did not violate the ADA because he posed significant health and safety risks to…

  10. The "Ada" Verb of Being in Bahasa Malaysia. Colorado Research in Linguistics, No. 4.

    Science.gov (United States)

    Mader, Robin

    This paper examines the various syntactic and semantic functions of the "ada" verb of "being" in Malay. The claim is made that there is an abstract uppermost "ada" in the underlying structure of Malay sentences that asserts or denies the truth of the surface main clause. A further claim is made that the…

  11. Clinical utility of interferon-γ compared to ADA in tuberculous pleural effusion

    Directory of Open Access Journals (Sweden)

    Nariman A. Helmy

    2012-10-01

    Result: Our results demonstrate that the pleural fluid concentrations of ADA, INF-γ in patients with tuberculous pleural effusions are significantly higher than in other effusions. Most importantly, ROC analysis clearly demonstrated ADA to be more sensitive and specific than INF-γ for diagnosis of tuberculous pleuritis.

  12. Role of A3 adenosine receptor in diabetic neuropathy.

    Science.gov (United States)

    Yan, Heng; Zhang, Enshui; Feng, Chang; Zhao, Xin

    2016-10-01

    Neuropathy is the most common diabetic complication. Although the A1 and A2A adenosine receptors are important pharmacological targets in alleviating diabetic neuropathy, the role of the A3 adenosine receptor remains unknown. Because the A3 adenosine receptor regulates pain induced by chronic constriction injury or chemotherapy, its stimulation might also attenuate diabetic neuropathy. This study examines the effects of systemic treatment with the A3 adenosine receptor agonist 1-deoxy-1-[6-[[(3-iodophenyl)methyl]amino]-9H-purin-9-yl]-N-methyl-β-d-ribofuranuronamide (IB-MECA) on diabetic neuropathy and explores the putative mechanisms underlying its pharmacological effects. We show that IB-MECA alleviated mechanical hyperalgesia and thermal hypoalgesia in mice 2 weeks but not 4 weeks after streptozocin (STZ) treatment. Furthermore, IB-MECA prevented the reduction in sciatic motor nerve conduction velocity and sensory nerve conduction velocity in diabetic mice 2 weeks but not 4 weeks after STZ treatment. Similarly, IB-MECA inhibited the activation of nuclear factor-κB and decreased the generation of tumor necrosis factor-α in the spinal cord of mice 2 weeks but not 4 weeks after STZ treatment. These phenomena were associated with reduction of A3 adenosine receptor expression in the spinal cord after long-term diabetes. Our results suggest that the A3 adenosine receptor plays a critical role in regulating diabetic neuropathy and that reduction in A3 adenosine receptor expression/function might contribute to the progression of diabetic neuropathy. © 2016 Wiley Periodicals, Inc.

  13. O tempo na terceira Enéada de Plotino

    OpenAIRE

    Daniel Schiochett

    2009-01-01

    Plotino é conhecido pela doutrina das três hipóstases: o Uno, a Inteligência e a Alma. Enquanto neoplatônico, sua doutrina é pensada a partir da visão platônica do mundo. Todavia, na terceira Enéada o filósofo se põe a discutir longamente a concepção antiga do tempo, fortemente devedora da doutrina aristotélica. Plotino, ao seu modo, consegue reinterpretar e adequar a noção aristotélica do tempo à concepção de mundo platônica. O tempo, para Plotino, por um lado, permanece referido ao moviment...

  14. Storage management in Ada. Three reports. Volume 1: Storage management in Ada as a risk to the development of reliable software. Volume 2: Relevant aspects of language. Volume 3: Requirements of the language versus manifestations of current implementations

    Science.gov (United States)

    Auty, David

    1988-01-01

    The risk to the development of program reliability is derived from the use of a new language and from the potential use of new storage management techniques. With Ada and associated support software, there is a lack of established guidelines and procedures, drawn from experience and common usage, which assume reliable behavior. The risk is identified and clarified. In order to provide a framework for future consideration of dynamic storage management on Ada, a description of the relevant aspects of the language is presented in two sections: Program data sources, and declaration and allocation in Ada. Storage-management characteristics of the Ada language and storage-management characteristics of Ada implementations are differentiated. Terms that are used are defined in a narrow and precise sense. The storage-management implications of the Ada language are described. The storage-management options available to the Ada implementor and the implications of the implementor's choice for the Ada programmer are also described.

  15. The implementation and use of Ada on distributed systems with reliability requirements

    Science.gov (United States)

    Reynolds, P. F.; Knight, J. C.; Urquhart, J. I. A.

    1983-01-01

    The issues involved in the use of the programming language Ada on distributed systems are discussed. The effects of Ada programs on hardware failures such as loss of a processor are emphasized. It is shown that many Ada language elements are not well suited to this environment. Processor failure can easily lead to difficulties on those processors which remain. As an example, the calling task in a rendezvous may be suspended forever if the processor executing the serving task fails. A mechanism for detecting failure is proposed and changes to the Ada run time support system are suggested which avoid most of the difficulties. Ada program structures are defined which allow programs to reconfigure and continue to provide service following processor failure.

  16. Characterization of 1-Aminocyclopropane-1-Carboxylate (ACC) Deaminase-Containing Pseudomonas spp. in the Rhizosphere of Salt-Stressed Canola

    NARCIS (Netherlands)

    Akhgar, A.; Arzanlou, M.; Bakker, Peter; Hamidpour, M.

    2014-01-01

    When exposed to biotic or abiotic stress conditions, plants produce ethylene from its immediate precursor 1-aminocyclopropane-1- carboxylate (ACC), leading to retarded root growth and senescence. Many plant growth-promoting rhizobacteria contain the enzyme ACC deaminase and this enzyme can cleave AC

  17. Mechanish of dTTP Inhibition of the Bifunctional dCTP Deaminase:dUTPase Encoded by Mycobacterium tuberculosis

    DEFF Research Database (Denmark)

    Helt, Signe Smedegaard; Thymark, Majbritt; Harris, Pernille;

    2008-01-01

    to be characterised and provides evidence for bifunctionality of dCTP deaminase occurring outside the Archaea kingdom. A steady-state kinetic analysis revealed that the affinity for dCTP and deoxyuridine triphosphate as substrates for the synthesis of deoxyuridine monophosphate were very similar, a result...

  18. 1-Aminocyclopropane-1-carboxylate (ACC) deaminases from Methylobacterium radiotolerans and Methylobacterium nodulans with higher specificity for ACC.

    Science.gov (United States)

    Fedorov, Dmitry N; Ekimova, Galina A; Doronina, Nina V; Trotsenko, Yuri A

    2013-06-01

    The 1-aminocyclopropane-1-carboxylate (ACC) deaminases (EC 3.4.99.7), the key enzymes of degradation of the precursor of the phytohormone ethylene, have not been well studied despite their great importance for plant-bacterial interactions. Using blast, the open reading frames encoding ACC deaminases were found in the genomes of epiphytic methylotroph Methylobacterium radiotolerans JCM2831 and nodule-forming endosymbiont Methylobacterium nodulans ORS2060. These genes were named acdS and cloned; recombinant proteins were expressed and purified from Escherichia coli. The enzyme from M. nodulans displayed the highest substrate specificity among all of the characterized ACC deaminases (Km 0.80 ± 0.04 mM), whereas the enzyme from M. radiotolerans had Km 1.8 ± 0.3 mM. The kcat values were 111.8 ± 0.2 and 65.8 ± 2.8 min(-1) for the enzymes of M. nodulans and M. radiotolerans, respectively. Both enzymes are homotetramers with a molecular mass of 144 kDa, as was demonstrated by size exclusion chromatography and native PAGE. The purified enzymes displayed the maximum activity at 45-50 °C and pH 8.0. Thus, the priority data have been obtained, extending the knowledge of biochemical properties of bacterial ACC deaminases.

  19. Intracoronary adenosine improves myocardial perfusion in late reperfused myocardial infarction

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Background Myocardial perfusion associates with clinical syndromes and prognosis.Adenosine could improve myocardial perfusion of acute myocardial infarction within 6 hours,but few data are available on late perfusion of myocardial infarction (MI).This study aimed at quantitatively evaluating the value of intracoronary adenosine improving myocardial perfusion in late reperfused MI with myocardial contrast echocardiography(MCE).Methods Twenty-six patients with anterior wall infarcts were divided randomly into 2 groups:adenosine group(n=12) and normal saline group(n=14).Their history of myocardial infarction was about 3-12 weeks.Adenosine or normalsaline was given when the guiding wire crossed the lesion through percutaneous coronary intervention(PCI),then the balloon was dilated and stent(Cypher/Cypher select)was implanted at the lesion.Contrast pulse sequencing MCE with Sonovue contrast via the coronary route was done before PCI and 30 minutes after PCI.Video densitometry and contrast filled-blank area were calculated with the CUSQ off-line software.Heart function and cardiac events were followed up within 30 days.Results Perfusion in the segments of the criminal occlusive coronary artery in the adenosine group was better than that in the saline group(5.71±0.29 vs 4.95±1.22,P<0.05).Ischemic myocardial segment was deminished significantly afterPCI,but the meliorated area was bigger in the adenosine group than in the saline group((1.56±0.60)cm2 vs(1.02±0.56) cm2,P<0.05).The video densitometry in critical segments was also improved significantly in the adenosine group (5.53±0.36 vs 5.26±0.35,P<0.05).Left ventricular ejection fraction(LVEF)was improved in all patients after PCI,but EF was not significant between the two groups((67±6)% vs(62±7)%,P>0.05).There was no in-hospital or 30-day major adverse cardiac event(MACE)in the adenosine group but 3 MACE in the saline group in 30 days after PCI.Conclusions Adenosine could improve myocardial microvascular

  20. Digital data sets that describe aquifer characteristics of the Vamoosa-Ada aquifer in east-central Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digitized polygons of constant recharge values for the Vamoosa-Ada aquifer, in east-central Oklahoma. The Vamoosa-Ada aquifer is an...

  1. Digital data sets that describe aquifer characteristics of the Vamoosa-Ada aquifer in east-central Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digitized water-level elevation contours for the Vamoosa-Ada aquifer in east-central Oklahoma. The Vamoosa-Ada aquifer is an important...

  2. Digital data sets that describe aquifer characteristics of the Vamoosa-Ada aquifer in east-central Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digitized polygons of constant hydraulic conductivity values for the Vamoosa-Ada aquifer in east-central Oklahoma. The Vamoosa-Ada aquifer...

  3. Digital data sets that describe aquifer characteristics of the Vamoosa-Ada aquifer in east-central Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digitized aquifer boundaries for the Vamoosa-Ada aquifer in east-central Oklahoma. The Vamoosa-Ada aquifer is an important source of water...

  4. Differential adenosine sensitivity of diaphragm and skeletal muscle arterioles.

    Science.gov (United States)

    Aaker, Aaron; Laughlin, M H

    2002-09-01

    The hyperemic response in exercising skeletal muscle is dependent on muscle fiber-type composition and fiber recruitment patterns, but the vascular control mechanisms producing exercise hyperemia in skeletal muscle remain poorly understood. The purpose of this study was to test the hypothesis that arterioles from white, low-oxidative skeletal muscle are less responsive to adenosine-induced dilation than are arterioles from diaphragm (Dia) and red, high-oxidative skeletal muscle. Second-order arterioles (2As) were isolated from the white portion of gastrocnemius muscle (WG; low-oxidative, fast-twitch muscle tissue) and two types of high-oxidative skeletal muscle [Dia and red portion of gastrocnemius muscle (RG)] of rats. Results reveal that 2As from all three types of muscle dilated in response to the endothelium-dependent dilator acetylcholine (WG: 48 +/- 3%, Dia: 51 +/- 3%, RG: 74 +/- 3%). In contrast, adenosine dilated only 2As from WG (48 +/- 4%) and Dia (46 +/- 5%) but not those from RG (5 +/- 5%). Thus adenosine-induced dilator responses differed among 2As of these different types of muscle tissue. However, the results do not support our hypothesis because 2As from Dia and WG dilated in response to adenosine, whereas 2As from RG did not. We conclude that the adenosine responsiveness of 2As from rat skeletal muscle cannot be predicted only by the fiber-type composition or oxidative capacity of the skeletal muscle tissue wherein the arteriole lies.

  5. 腺苷脱氨酶(ADA)微量测定法的研究%Reseach on ADA Microtiter Method

    Institute of Scientific and Technical Information of China (English)

    侯超; 王新宁

    2003-01-01

    目的:设计一种用于检测腺苷脱氨酶微量(ADA)的微量检测方法.方法:通过对实验方法的改进,利用酶标仪进行比色.结果:将微量法所得结果(大于50 U/L的标本需稀释后重新测定)与常规的比色法进行配对比较下,两方法无显著性差异,t=1.51,0.10<P<0.20.结论:在常规工作中可用微量法替代氨试剂比色法,若遇到大于50U/L的标本,稀释后再进行测定.

  6. Studies of 1-Amino-2,2-difluorocyclopropane-1-carboxylic Acid: Mechanism of Decomposition and Inhibition of 1-Aminocyclopropane-1-carboxylic Acid Deaminase.

    Science.gov (United States)

    Liu, Cheng-Hao; Wang, Shao-An; Ruszczycky, Mark W; Chen, Huawei; Li, Keqiang; Murakami, Kazuo; Liu, Hung-wen

    2015-07-02

    1-Amino-2,2-difluorocyclopropane-1-carboxylic acid (DFACC) is of interest in the study of 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase due to the increased reactivity of its cyclopropyl functionality. It is shown that DFACC is unstable under near-physiological conditions where it primarily decomposes via specific-base catalysis to 3-fluoro-2-oxobut-3-enoic acid with a rate constant of 0.18 ± 0.01 min(-1). Upon incubation with ACC deaminase, DFACC is found to be a slow-dissociating inhibitor of ACC deaminase with submicromolar affinity.

  7. Correlation between blood adenosine metabolism and sleep in humans.

    Science.gov (United States)

    Díaz-Muñoz, M; Hernández-Muñoz, R; Suárez, J; Vidrio, S; Yááñez, L; Aguilar-Roblero, R; Rosenthal, L; Villalobos, L; Fernández-Cancino, F; Drucker-Colín, R; Chagoya De Sanchez, V

    1999-01-01

    Blood adenosine metabolism, including metabolites and metabolizing enzymes, was studied during the sleep period in human volunteers. Searching for significant correlations among biochemical parameters found: adenosine with state 1 of slow-wave sleep (SWS); activity of 5'-nucleotidase with state 2 of SWS; inosine and AMP with state 3-4 of SWS; and activity of 5'-nucleotidase and lactate with REM sleep. The correlations were detected in all of the subjects that presented normal hypnograms, but not in those who had fragmented sleep the night of the experiment. The data demonstrate that it is possible to obtain information of complex brain operations such as sleep by measuring biochemical parameters in blood. The results strengthen the notion of a role played by adenosine, its metabolites and metabolizing enzymes, during each of the stages that constitute the sleep process in humans.

  8. Tween 20-stabilized gold nanoparticles combined with adenosine triphosphate-BODIPY conjugates for the fluorescence detection of adenosine with more than 1000-fold selectivity

    Energy Technology Data Exchange (ETDEWEB)

    Hung, Szu-Ying; Shih, Ya-Chen [Department of Chemistry, National Sun Yat-sen University, Taiwan (China); Tseng, Wei-Lung, E-mail: tsengwl@mail.nsysu.edu.tw [Department of Chemistry, National Sun Yat-sen University, Taiwan (China); School of Pharmacy, College of Pharmacy, Kaohsiung Medical University, Taiwan (China); Center for Nanoscience and Nanotechnology, National Sun Yat-sen University, Taiwan (China); Center for Stem Cell Research, Kaohsiung Medical University, Taiwan (China)

    2015-02-01

    Graphical abstract: A simple, enzyme-free, label-free, sensitive and selective system was developed for detecting adenosine based on the use of Tween 20-stabilized gold nanoparticles as an efficient quencher for boron dipyrromethene-conjugated adenosine 5′-triphosphate and as a recognition element for adenosine. - Highlights: • The proposed method can detect adenosine with more than 1000-fold selectivity. • The analysis of adenosine is rapid (∼6 min) using the proposed method. • This method provided better sensitivity for adenosine as compared to aptamer-based sensors. • This method can be applied for the determination of adenosine in urine. - Abstract: This study describes the development of a simple, enzyme-free, label-free, sensitive, and selective system for detecting adenosine based on the use of Tween 20-stabilized gold nanoparticles (Tween 20-AuNPs) as an efficient fluorescence quencher for boron dipyrromethene-conjugated adenosine 5′-triphosphate (BODIPY-ATP) and as a recognition element for adenosine. BODIPY-ATP can interact with Tween 20-AuNPs through the coordination between the adenine group of BODIPY-ATP and Au atoms on the NP surface, thereby causing the fluorescence quenching of BODIPY-ATP through the nanometal surface energy transfer (NSET) effect. When adenosine attaches to the NP surface, the attached adenosine exhibits additional electrostatic attraction to BODIPY-ATP. As a result, the presence of adenosine enhances the efficiency of AuNPs in fluorescence quenching of BODIPY-ATP. The AuNP-induced fluorescence quenching of BODIPY-ATP progressively increased with an increase in the concentration of adenosine; the detection limit at a signal-to-noise ratio of 3 for adenosine was determined to be 60 nM. The selectivity of the proposed system was more than 1000-fold for adenosine over any adenosine analogs and other nucleotides. The proposed system combined with a phenylboronic acid-containing column was successfully applied to the

  9. Development of coronary vasospasm during adenosine-stress myocardial perfusion CT imaging

    Energy Technology Data Exchange (ETDEWEB)

    Nam, Jeong Gu; Choi, Seong Hoon; Kang, Byeong Seong; Bang, Min Aeo; Kwon, Woon Jeong [Dept. of Radiology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan (Korea, Republic of)

    2015-06-15

    Adenosine is a short-acting coronary vasodilator, and it is widely used during pharmacological stress myocardial perfusion imaging. It has a well-established safety profile, and most of its side effects are known to be mild and transient. Until now, coronary vasospasm has been rarely reported as a side effect of adenosine during or after adenosine stress test. This study reports a case of coronary vasospasm which was documented on stress myocardial perfusion CT imaging during adenosine stress test.

  10. 基于改进的AdaBoost人脸检测算法的研究%Research on Face Detection Based on Improved AdaBoost Algorithm

    Institute of Scientific and Technical Information of China (English)

    丁知平

    2013-01-01

    Face detection is a fundamental research theme in the topic of computer vision ,and it has a broad application in many fields such as video surveillance,automatic face recognition,etc. To improve the detection speed of AdaBoost based face detection algorithm, proposes a rapid im-proved AdaBoost based face detection algorithm. Experiments shows that, compared with the current algorithm less features are selected in the inspection, and a high detection correct rate is achieved with the proposed algorithm.%  人脸检测是计算机视觉领域的基础研究,在视频监控、自动人脸识别等领域有着重要应用价值。针对传统的AdaBoost算法用于人脸检测时需要的特征数目多、检测速度慢的问题,提出一种基于改进的AdaBoost人脸检测算法。实验结果表明,相对于传统的AdaBoost人脸检测算法,该算法使用较少的特征即可达到较高的检测准确率,检测速度得到显著提高。

  11. Cloning, expression, and purification of cytidine deaminase from Arabidopsis thaliana

    DEFF Research Database (Denmark)

    Vincenzetti, Silvia; Cambi, Alessandra; Neuhard, Jan

    1999-01-01

    inEscherichia colifollowing induction with isopropyl 1-thio-ß- -galactopyranoside, showed high cytidine deaminase activity. The nucleotide sequence showed a 903-bp open reading frame encoding a polypeptide of 301 amino acids with a calculated molecular mass of 32,582. The deduced amino acid sequence...... preparation was >98% pure as judged by SDS-PAGE and showed a specific activity of 74 U/mg. The molecular mass of AT-CDA1 estimated by gel filtration was 63 kDa, indicating, in contrast to the other eukaryotic CDAs, that the enzyme is a dimer composed of two identical subunits. Inductively coupled plasma......-optical emission spectroscopy analysis indicated that the enzyme contains 1 mol of zinc atom per mole of subunit. The kinetic properties of AT-CDA1 both toward the natural substrates and with analogs indicated that the catalytic mechanism of the plant enzyme is probably very similar to that of the human the...

  12. Acquisition of Genetic Aberrations by Activation-Induced Cytidine Deaminase (AID) during Inflammation-Associated Carcinogenesis

    Energy Technology Data Exchange (ETDEWEB)

    Takai, Atsushi; Marusawa, Hiroyuki, E-mail: maru@kuhp.kyoto-u.ac.jp; Chiba, Tsutomu [Department of Gastroenterology and Hepatology, Graduate School of Medicine, Kyoto University, 54 Shogoin-Kawahara-cho, Sakyo-ku, Kyoto 606-8507 (Japan)

    2011-06-22

    Genetic abnormalities such as nucleotide alterations and chromosomal disorders that accumulate in various tumor-related genes have an important role in cancer development. The precise mechanism of the acquisition of genetic aberrations, however, remains unclear. Activation-induced cytidine deaminase (AID), a nucleotide editing enzyme, is essential for the diversification of antibody production. AID is expressed only in activated B lymphocytes under physiologic conditions and induces somatic hypermutation and class switch recombination in immunoglobulin genes. Inflammation leads to aberrant AID expression in various gastrointestinal organs and increased AID expression contributes to cancer development by inducing genetic alterations in epithelial cells. Studies of how AID induces genetic disorders are expected to elucidate the mechanism of inflammation-associated carcinogenesis.

  13. Acquisition of Genetic Aberrations by Activation-Induced Cytidine Deaminase (AID during Inflammation-Associated Carcinogenesis

    Directory of Open Access Journals (Sweden)

    Tsutomu Chiba

    2011-06-01

    Full Text Available Genetic abnormalities such as nucleotide alterations and chromosomal disorders that accumulate in various tumor-related genes have an important role in cancer development. The precise mechanism of the acquisition of genetic aberrations, however, remains unclear. Activation-induced cytidine deaminase (AID, a nucleotide editing enzyme, is essential for the diversification of antibody production. AID is expressed only in activated B lymphocytes under physiologic conditions and induces somatic hypermutation and class switch recombination in immunoglobulin genes. Inflammation leads to aberrant AID expression in various gastrointestinal organs and increased AID expression contributes to cancer development by inducing genetic alterations in epithelial cells. Studies of how AID induces genetic disorders are expected to elucidate the mechanism of inflammation-associated carcinogenesis.

  14. Nonimmunoglobulin target loci of activation-induced cytidine deaminase (AID) share unique features with immunoglobulin genes.

    Science.gov (United States)

    Kato, Lucia; Begum, Nasim A; Burroughs, A Maxwell; Doi, Tomomitsu; Kawai, Jun; Daub, Carsten O; Kawaguchi, Takahisa; Matsuda, Fumihiko; Hayashizaki, Yoshihide; Honjo, Tasuku

    2012-02-14

    Activation-induced cytidine deaminase (AID) is required for both somatic hypermutation and class-switch recombination in activated B cells. AID is also known to target nonimmunoglobulin genes and introduce mutations or chromosomal translocations, eventually causing tumors. To identify as-yet-unknown AID targets, we screened early AID-induced DNA breaks by using two independent genome-wide approaches. Along with known AID targets, this screen identified a set of unique genes (SNHG3, MALAT1, BCL7A, and CUX1) and confirmed that these loci accumulated mutations as frequently as Ig locus after AID activation. Moreover, these genes share three important characteristics with the Ig gene: translocations in tumors, repetitive sequences, and the epigenetic modification of chromatin by H3K4 trimethylation in the vicinity of cleavage sites.

  15. Clinical Applications of Gene Therapy for Primary Immunodeficiencies

    OpenAIRE

    2015-01-01

    Primary immunodeficiencies (PIDs) have represented a paradigmatic model for successes and pitfalls of hematopoietic stem cells gene therapy. First clinical trials performed with gamma retroviral vectors (γ-RV) for adenosine deaminase severe combined immunodeficiency (ADA-SCID), X-linked SCID (SCID-X1), and Wiskott–Aldrich syndrome (WAS) showed that gene therapy is a valid therapeutic option in patients lacking an HLA-identical donor. No insertional mutagenesis events have been observed in mor...

  16. Ada compiler evaluation on the Space Station Freedom Software Support Environment project

    Science.gov (United States)

    Badal, D. L.

    1989-01-01

    This paper describes the work in progress to select the Ada compilers for the Space Station Freedom Program (SSFP) Software Support Environment (SSE) project. The purpose of the SSE Ada compiler evaluation team is to establish the criteria, test suites, and benchmarks to be used for evaluating Ada compilers for the mainframes, workstations, and the realtime target for flight- and ground-based computers. The combined efforts and cooperation of the customer, subcontractors, vendors, academia and SIGAda groups made it possible to acquire the necessary background information, benchmarks, test suites, and criteria used.

  17. Dispersed sites of HIV Vif-dependent polyubiquitination in the DNA deaminase APOBEC3F.

    Science.gov (United States)

    Albin, John S; Anderson, John S; Johnson, Jeffrey R; Harjes, Elena; Matsuo, Hiroshi; Krogan, Nevan J; Harris, Reuben S

    2013-04-12

    APOBEC3F (A3F) and APOBEC3G (A3G) are DNA cytosine deaminases that potently restrict human immunodeficiency virus type 1 replication when the virus is deprived of its accessory protein Vif (virion infectivity factor). Vif counteracts these restriction factors by recruiting A3F and A3G to an E3 ubiquitin (Ub) ligase complex that mediates their polyubiquitination (polyUb) and proteasomal degradation. While previous efforts have identified single amino acid residues in APOBEC3 proteins required for Vif recognition, less is known about the downstream Ub acceptor sites that are targeted. One prior report identified a cluster of polyubiquitinated residues in A3G and proposed an antiparallel model of A3G interaction with the Vif-E3 Ub ligase complex wherein Vif binding at one terminus of A3G orients the opposite terminus for polyUb [Iwatani et al. (2009). Proc. Natl. Acad. Sci. USA, 106, 19539-19544]. To test the generalizability of this model, we carried out a complete mutagenesis of the lysine residues in A3F and used a complementary, unbiased proteomic approach to identify Ub acceptor sites targeted by Vif. Our data indicate that internal lysines are the dominant Ub acceptor sites in both A3F and A3G. In contrast with the proposed antiparallel model, however, we find that the Vif-dependent polyUb of A3F and A3G can occur at multiple acceptor sites dispersed along predicted lysine-enriched surfaces of both the N- and C-terminal deaminase domains. These data suggest an alternative model for binding of APOBEC3 proteins to the Vif-E3 Ub ligase complex and diminish enthusiasm for the amenability of APOBEC3 Ub acceptor sites to therapeutic intervention.

  18. DMPD: Shaping of monocyte and macrophage function by adenosine receptors. [Dynamic Macrophage Pathway CSML Database

    Lifescience Database Archive (English)

    Full Text Available 17056121 Shaping of monocyte and macrophage function by adenosine receptors. Hasko ...tml) (.csml) Show Shaping of monocyte and macrophage function by adenosine receptors. PubmedID 17056121 Titl...e Shaping of monocyte and macrophage function by adenosine receptors. Authors Has

  19. Adenosine A(3) receptor-induced CCL2 synthesis in cultured mouse astrocytes

    NARCIS (Netherlands)

    Wittendorp, MC; Boddeke, HWGM; Biber, K

    2004-01-01

    During neuropathological conditions, high concentrations of adenosine are released, stimulating adenosine receptors in neurons and glial cells. It has recently been shown that stimulation of adenosine receptors in glial cells induces the release of neuroprotective substances such as NGF, S-100beta,

  20. The role of glial adenosine receptors in neural resilience and the neurobiology of mood disorders

    NARCIS (Netherlands)

    Calker, D; Biber, K

    2005-01-01

    Adenosine receptors were classified into A(1)- and A(2)-receptors in the laboratory of Bernd Hamprecht more than 25 years ago. Adenosine receptors are instrumental to the neurotrophic effects of glia cells. Both microglia and astrocytes release after stimulation via adenosine receptors factors that

  1. Searching Inhibitors of Adenosine Kinase by Simulation Methods

    Institute of Scientific and Technical Information of China (English)

    ZHU Rui-Xin; ZHANG Xing-Long; DONG Xi-Cheng; CHEN Min-Bo

    2006-01-01

    Searching new inhibitors of adenosine kinase (AK) is still drawing attention of experimental scientists. A better and solid model is here proposed by means of simulation methods from different ways, the direct analysis of receptor itself, the conventional 3D-QSAR methods and the integration of docking method and the conventional QSAR analysis.

  2. 21 CFR 864.7040 - Adenosine triphosphate release assay.

    Science.gov (United States)

    2010-04-01

    ... device that measures the release of adenosine triphosphate (ATP) from platelets following aggregation. This measurement is made on platelet-rich plasma using a photometer and a luminescent firefly extract. Simultaneous measurements of platelet aggregation and ATP release are used to evaluate platelet...

  3. No role of interstitial adenosine in insulin-mediated vasodilation

    DEFF Research Database (Denmark)

    Dela, F; Stallknecht, B

    1999-01-01

    The mechanisms behind the vasodilatory effect of insulin are not fully understood, but nitric oxide plays an important role. We have investigated the possibility that insulin mediates vasodilatation in the human skeletal muscle via an increase in extracellular adenosine concentrations. In eight h...

  4. CD39/adenosine pathway is involved in AIDS progression.

    Directory of Open Access Journals (Sweden)

    Maria Nikolova

    2011-07-01

    Full Text Available HIV-1 infection is characterized by a chronic activation of the immune system and suppressed function of T lymphocytes. Regulatory CD4+ CD25(high FoxP3+CD127(low T cells (Treg play a key role in both conditions. Here, we show that HIV-1 positive patients have a significant increase of Treg-associated expression of CD39/ENTPD1, an ectoenzyme which in concert with CD73 generates adenosine. We show in vitro that the CD39/adenosine axis is involved in Treg suppression in HIV infection. Treg inhibitory effects are relieved by CD39 down modulation and are reproduced by an adenosine-agonist in accordance with a higher expression of the adenosine A2A receptor on patients' T cells. Notably, the expansion of the Treg CD39+ correlates with the level of immune activation and lower CD4+ counts in HIV-1 infected patients. Finally, in a genetic association study performed in three different cohorts, we identified a CD39 gene polymorphism that was associated with down-modulated CD39 expression and a slower progression to AIDS.

  5. Characterization and optimization of 1-Aminocyclopropane-1-Carboxylate Deaminase (ACCD activity in different rhizospheric PGPR along with Microbacterium sp. strain ECI-12A

    Directory of Open Access Journals (Sweden)

    Ashok Kumar

    2013-03-01

    Full Text Available A total of nine strains of plant growth promoting rhizobacteria were analyzed for ACC deaminase activity, where highest ACC deaminase activity was found in Klebsiella sp strain ECI-10A (539.1 nmol α-keto butyrate/ mg protein/ h and lowest in Microbacterium sp strain ECI-12A (122.0 nmol α-keto butyrate/ mg protein/ h. Although Microbacterium sp strain ECI-12A showed lowest level of ACC deaminase activity, but, the species of Microbacterium isolated from rhizosphere is the first report. Microbacterium sp strain ECI-12A was also analyzed under varying conditions of time, amount of 1-Aminocyclopropane-1- carboxylate (ACC, and temperature for optimization of the ACC deaminase activity. The optimum activity was recorded with the supplementation of 5mM ACC at 30oC temperature after 24h of culture growth. All the nine strains showed acdS gene in the PCR amplification of that gene. No any rhizospheric Microbacterium species showing ACC deaminase activity have been reported earlier, therefore, we report here ACC deaminase activity in Microbacterium sp ECI-12A isolated from rice rhizosphere is a novel finding.

  6. 四元数小波和AdaBoost在人脸识别中的应用%Application of quaternion wavelet and AdaBoost in face recognition

    Institute of Scientific and Technical Information of China (English)

    徐永红; 申鸿魁; 赵艳茹; 洪文学

    2011-01-01

    提出一种基于四元数小波变换(QWT)幅值相位表示及AdaBoost的人脸识别方法.四元数小波变换具有近似的移不变特性,可以同时支持1个幅值和3个相位,其中两个相位编码局部图像移动,而第三个相位蕴含纹理信息.方法对人脸图像进行预处理,进行四元数小波变换并计算四元数幅值和相位特征,将这些幅值和相位组合并应用AdaBoost分类器进行分类,以实现人脸图像的最终识别.对Yale、ORL和FERET三个人脸数据库应用此方法的实验结果表明,该方法在识别率上优于AdaBoost和Gabor+AdaBoost.特别是在FERET数据上精度提高更为明显,而且在计算复杂度上QWT特征提取明显低于Gabor特征提取.%This paper proposes a face recognition method based on the Quaternion Wavelet Transform (QWT) magnitude/ phase representation and AdaBoost.This recent transform is a near shift-invariant tight frame representation whose coefficients support a magnitude and three phases.The first two QWT phases encode the shifts of image features in the absolute horizon tal/vertical coordinate system, while the third phase encodes edge orientation mixtures and textural information.The method preprocesses human face images, uses QWT to extract the wavelet coefficients of muIti-orientation, and quaternion amplitude and three phases are computed.These quaternion amplitude and phase features are combined and AdaBoost is used to realize recognition.Experimental resuIts on three face databases including Yale, ORL and FERET show that the method has higher recognition rates than AdaBoost and Gabor+AdaBoost.This method has much better recognizing resuIt on FERET especially. Compared with Gabor wavelet features,QWT features are superior both in accuracy and computation complexity.

  7. The implementation and use of Ada on distributed systems with high reliability requirements

    Science.gov (United States)

    Knight, J. C.

    1987-01-01

    Performance analysis was begin on the Ada implementations. The goal is to supply the system designer with tools that will allow a rational decision to be made about whether a particular implementation can support a given application early in the design cycle. Primary activities were: analysis of the original approach to recovery in distributed Ada programs using the Advanced Transport Operating System (ATOPS) example; review and assessment of the original approach which was found to be capable of improvement; preparation and presentation of a paper at the 1987 Washington DC Ada Symposium; development of a refined approach to recovery that is presently being applied to the ATOPS example; and design and development of a performance assessment scheme for Ada programs based on a flexible user-driven benchmarking system.

  8. System testing of a production Ada (trademark) project: The GRODY study

    Science.gov (United States)

    Seigle, Jeffrey; Esker, Linda; Shi, Ying-Liang

    1990-01-01

    The use of the Ada language and design methodologies that utilize its features has a strong impact on all phases of the software development project lifecycle. At the National Aeronautics and Space Administration/Goddard Space Flight Center (NASA/GSFC), the Software Engineering Laboratory (SEL) conducted an experiment in parallel development of two flight dynamics systems in FORTRAN and Ada. The teams found some qualitative differences between the system test phases of the two projects. Although planning for system testing and conducting of tests were not generally affected by the use of Ada, the solving of problems found in system testing was generally facilitated by Ada constructs and design methodology. Most problems found in system testing were not due to difficulty with the language or methodology but to lack of experience with the application.

  9. Striatal adenosine-cannabinoid receptor interactions in rats over-expressing adenosine A2A receptors.

    Science.gov (United States)

    Chiodi, Valentina; Ferrante, Antonella; Ferraro, Luca; Potenza, Rosa Luisa; Armida, Monica; Beggiato, Sarah; Pèzzola, Antonella; Bader, Michael; Fuxe, Kjell; Popoli, Patrizia; Domenici, Maria Rosaria

    2016-03-01

    Adenosine A2A receptors (A2 A Rs) and cannabinoid CB1 receptors (CB1 Rs) are highly expressed in the striatum, where they functionally interact and form A2A /CB1 heteroreceptor complexes. We investigated the effects of CB1 R stimulation in a transgenic rat strain over-expressing A2 A Rs under the control of the neural-specific enolase promoter (NSEA2A rats) and in age-matched wild-type (WT) animals. The effects of the CB1 R agonist WIN 55,212-2 (WIN) were significantly lower in NSEA2A rats than in WT animals, as demonstrated by i) electrophysiological recordings of synaptic transmission in corticostriatal slices; ii) the measurement of glutamate outflow from striatal synaptosomes and iii) in vivo experiments on locomotor activity. Moreover, while the effects of WIN were modulated by both A2 A R agonist (CGS 21680) and antagonists (ZM 241385, KW-6002 and SCH-442416) in WT animals, the A2 A R antagonists failed to influence WIN-mediated effects in NSEA2A rats. The present results demonstrate that in rats with genetic neuronal over-expression of A2 A Rs, the effects mediated by CB1 R activation in the striatum are significantly reduced, suggesting a change in the stoichiometry of A2A and CB1 receptors and providing a strategy to dissect the involvement of A2 A R forming or not forming heteromers in the modulation of striatal functions. These findings add additional evidence for the existence of an interaction between striatal A2 A Rs and CB1 Rs, playing a fundamental role in the regulation of striatal functions. We studied A2A -CB1 receptor interaction in transgenic rats over-expressing adenosine A2A receptors under the control of the neuron-specific enolase promoter (NSEA2A ). In these rats, we demonstrated a reduced effect of the CB1 receptor agonist WIN 55,212-2 in the modulation of corticostriatal synaptic transmission and locomotor activity, while CB1 receptor expression level did not change with respect to WT rats. A reduction in the expression of A2A -CB1

  10. Particular application of methods of AdaBoost and LBP to the problems of computer vision

    OpenAIRE

    Волошин, Микола Володимирович

    2012-01-01

    The application of AdaBoost method and local binary pattern (LBP) method for different spheres of computer vision implementation, such as personality identification and computer iridology, is considered in the article. The goal of the research is to develop error-correcting methods and systems for implements of computer vision and computer iridology, in particular. This article considers the problem of colour spaces, which are used as a filter and as a pre-processing of images. Method of AdaB...

  11. A study of the portability of an Ada system in the software engineering laboratory (SEL)

    Science.gov (United States)

    Jun, Linda O.; Valett, Susan Ray

    1990-01-01

    A particular porting effort is discussed, and various statistics on analyzing the portability of Ada and the total staff months (overall and by phase) required to accomplish the rehost, are given. This effort is compared to past experiments on the rehosting of FORTRAN systems. The discussion includes an analysis of the types of errors encountered during the rehosting, the changes required to rehost the system, experiences with the Alsys IBM Ada compiler, the impediments encountered, and the lessons learned during this study.

  12. A-D-A small molecules for solution-processed organic photovoltaic cells.

    Science.gov (United States)

    Ni, Wang; Wan, Xiangjian; Li, Miaomiao; Wang, Yunchuang; Chen, Yongsheng

    2015-03-25

    A-D-A small molecules have drawn more and more attention in solution-processed organic solar cells due to the advantages of a diversity of structures, easy control of energy levels, etc. Recently, a power conversion efficiency of nearly 10% has been achieved through careful material design and device optimization. This feature article reviews recent representative progress in the design and application of A-D-A small molecules in organic photovoltaic cells.

  13. Confidence-based multiclass AdaBoost for physical activity monitoring

    OpenAIRE

    Reiss, Attila; Hendeby, Gustaf; Stricker, Didier

    2013-01-01

    Physical activity monitoring has recently become an important topic in wearable computing, motivated by e.g. healthcare applications. However, new benchmark results show that the difficulty of the complex classification problems exceeds the potential of existing classifiers. Therefore, this paper proposes the ConfAdaBoost.M1 algorithm. The proposed algorithm is a variant of the AdaBoost.M1 that incorporates well established ideas for confidence based boosting. The method is compared to the mo...

  14. Combinatorial depletion analysis to assemble the network architecture of the SAGA and ADA chromatin remodeling complexes.

    Science.gov (United States)

    Lee, Kenneth K; Sardiu, Mihaela E; Swanson, Selene K; Gilmore, Joshua M; Torok, Michael; Grant, Patrick A; Florens, Laurence; Workman, Jerry L; Washburn, Michael P

    2011-07-05

    Despite the availability of several large-scale proteomics studies aiming to identify protein interactions on a global scale, little is known about how proteins interact and are organized within macromolecular complexes. Here, we describe a technique that consists of a combination of biochemistry approaches, quantitative proteomics and computational methods using wild-type and deletion strains to investigate the organization of proteins within macromolecular protein complexes. We applied this technique to determine the organization of two well-studied complexes, Spt-Ada-Gcn5 histone acetyltransferase (SAGA) and ADA, for which no comprehensive high-resolution structures exist. This approach revealed that SAGA/ADA is composed of five distinct functional modules, which can persist separately. Furthermore, we identified a novel subunit of the ADA complex, termed Ahc2, and characterized Sgf29 as an ADA family protein present in all Gcn5 histone acetyltransferase complexes. Finally, we propose a model for the architecture of the SAGA and ADA complexes, which predicts novel functional associations within the SAGA complex and provides mechanistic insights into phenotypical observations in SAGA mutants.

  15. Constructing a working taxonomy of functional Ada software components for real-time embedded system applications

    Science.gov (United States)

    Wallace, Robert

    1986-01-01

    A major impediment to a systematic attack on Ada software reusability is the lack of an effective taxonomy for software component functions. The scope of all possible applications of Ada software is considered too great to allow the practical development of a working taxonomy. Instead, for the purposes herein, the scope of Ada software application is limited to device and subsystem control in real-time embedded systems. A functional approach is taken in constructing the taxonomy tree for identified Ada domain. The use of modular software functions as a starting point fits well with the object oriented programming philosophy of Ada. Examples of the types of functions represented within the working taxonomy are real time kernels, interrupt service routines, synchronization and message passing, data conversion, digital filtering and signal conditioning, and device control. The constructed taxonomy is proposed as a framework from which a need analysis can be performed to reveal voids in current Ada real-time embedded programming efforts for Space Station.

  16. Small-Animal PET Study of Adenosine A(1) Receptors in Rat Brain : Blocking Receptors and Raising Extracellular Adenosine

    NARCIS (Netherlands)

    Paul, Soumen; Khanapur, Shivashankar; Rybczynska, Anna A.; Kwizera, Chantal; Sijbesma, Jurgen W. A.; Ishiwata, Kiichi; Willemsen, Antoon T. M.; Elsinga, Philip H.; Dierckx, Rudi A. J. O.; van Waarde, Aren

    2011-01-01

    Activation of adenosine A(1) receptors (A(1)R) in the brain causes sedation, reduces anxiety, inhibits seizures, and promotes neuroprotection. Cerebral A(1)R can be visualized using 8-dicyclopropylmethyl-1-C-11-methyl-3-propyl-xanthine (C-11-MPDX) and PET. This study aims to test whether C-11-MPDX c

  17. The Rickettsia prowazekii invasion gene homolog (invA) encodes a Nudix hydrolase active on adenosine (5')-pentaphospho-(5')-adenosine.

    Science.gov (United States)

    Gaywee, Jariyanart; Xu, WenLian; Radulovic, Suzana; Bessman, Maurice J; Azad, Abdu F

    2002-03-01

    The genomic sequence of Rickettsia prowazekii, the obligate intracellular bacterium responsible for epidemic typhus, reveals an uncharacterized invasion gene homolog (invA). The deduced protein of 18,752 Da contains a Nudix signature, the specific motif found in the Nudix hydrolase family. To characterize the function of InvA, the gene was cloned and overexpressed in Escherichia coli. The expressed protein was purified to near homogeneity and subsequently tested for its enzymatic activity against a series of nucleoside diphosphate derivatives. The purified InvA exhibits hydrolytic activity toward dinucleoside oligophosphates (Np(n)N; n > or = 5), a group of cellular signaling molecules. At optimal pH 8.5, the enzyme actively degrades adenosine (5')-pentaphospho-(5')-adenosine into ATP and ADP with a K(m) of 0.1 mM and k(cat) of 1.9 s(-1). Guanosine (5')-pentaphospho-(5')-guanosine and adenosine-(5')-hexaphospho (5')-adenosine are also substrates. Similar to other Nudix hydrolases, InvA requires a divalent metal cation, Mg(2+) or Zn(2+), for optimal activity. These data suggest that the rickettsial invasion protein likely plays a role in controlling the concentration of stress-induced dinucleoside oligophosphates following bacterial invasion.

  18. Fast-scan Cyclic Voltammetry for the Characterization of Rapid Adenosine Release.

    Science.gov (United States)

    Nguyen, Michael D; Venton, B Jill

    2015-01-01

    Adenosine is a signaling molecule and downstream product of ATP that acts as a neuromodulator. Adenosine regulates physiological processes, such as neurotransmission and blood flow, on a time scale of minutes to hours. Recent developments in electrochemical techniques, including fast-scan cyclic voltammetry (FSCV), have allowed direct detection of adenosine with sub-second temporal resolution. FSCV studies have revealed a novel mode of rapid signaling that lasts only a few seconds. This rapid release of adenosine can be evoked by electrical or mechanical stimulations or it can be observed spontaneously without stimulation. Adenosine signaling on this time scale is activity dependent; however, the mode of release is not fully understood. Rapid adenosine release modulates oxygen levels and evoked dopamine release, indicating that adenosine may have a rapid modulatory role. In this review, we outline how FSCV can be used to detect adenosine release, compare FSCV with other techniques used to measure adenosine, and present an overview of adenosine signaling that has been characterized using FSCV. These studies point to a rapid mode of adenosine modulation, whose mechanism and function will continue to be characterized in the future.

  19. Intracerebral adenosine infusion improves neurological outcome after transient focal ischemia in rats.

    Science.gov (United States)

    Kitagawa, Hisashi; Mori, Atsushi; Shimada, Jun; Mitsumoto, Yasuhide; Kikuchi, Tetsuro

    2002-04-01

    Second Institute of New Drug Research, Otsuka Pharmaceutical Co., Ltd., Tokushima, Japan In order to elucidate the role of adenosine in brain ischemia, the possible protective effects of adenosine on ischemic brain injury were investigated in a rat model of brain ischemia both in vitro and in vivo. Exogenous adenosine dose-dependently rescued cortical neuronal cells from injury after glucose deprivation in vitro. Adenosine (1 mM) also significantly reduced hypoglycemia/hypoxia-induced glutamate release from the hippocampal slice. In a rat model of transient middle cerebral artery occlusion (MCAO), extracellular adenosine concentration was increased immediately after occlusion, and then returned to the baseline by 30 min after reperfusion. Adenosine infusion through a microdialysis probe into the ipsilateral striatum (1 mM adenosine, 2 microl min(-1), total 4.5 h from the occlusion to 3 h after reperfusion) showed a significant improvement in the neurological outcome, and about 25% reduction of infarct volume, although the effect did not reach statistical significance, compared with the vehicle-treated group at 20 h after 90 min of MCAO. These results demonstrated the neuroprotective effect of adenosine against ischemic brain injury both in vitro and in vivo, suggesting the possible therapeutic application of adenosine regulating agents, which inhibit adenosine uptake or metabolism to enhance or maintain extracellular endogenous adenosine levels, for stroke treatment.

  20. Protein preparation and preliminary X-ray crystallographic analysis of a putative glucosamine 6-phosphate deaminase from Streptococcus mutants

    Energy Technology Data Exchange (ETDEWEB)

    Hu, Guan-Jing; Li, Lan-Fen; Li, Dan; Liu, Cong [National Laboratory of Protein Engineering and Plant Genetic Engineering, College of Life Sciences, Peking University, Beijing 100871 (China); Wei, Shi-Cheng, E-mail: kqsc-wei@bjmu.edu.cn [Peking University School of Stomatology, Beijing 100081 (China); Liang, Yu-He, E-mail: kqsc-wei@bjmu.edu.cn; Su, Xiao-Dong [National Laboratory of Protein Engineering and Plant Genetic Engineering, College of Life Sciences, Peking University, Beijing 100871 (China)

    2007-09-01

    A glucosamine 6-phosphate deaminase homologue from S. mutans was expressed, purified and crystallized. Diffraction data have been collected to 2.4 Å resolution. The SMU.636 protein from Streptococcus mutans is a putative glucosamine 6-phosphate deaminase with 233 residues. The smu.636 gene was PCR-amplified from S. mutans genomic DNA and cloned into the expression vector pET-28a(+). The resultant His-tagged fusion protein was expressed in Escherichia coli and purified to homogeneity in two steps. Crystals of the fusion protein were obtained by the hanging-drop vapour-diffusion method. The crystals diffracted to 2.4 Å resolution and belong to space group P2{sub 1}2{sub 1}2{sub 1}, with unit-cell parameters a = 53.83, b = 82.13, c = 134.70 Å.

  1. Adenosine transiently modulates stimulated dopamine release in the caudate-putamen via A1 receptors.

    Science.gov (United States)

    Ross, Ashley E; Venton, B Jill

    2015-01-01

    Adenosine modulates dopamine in the brain via A1 and A2A receptors, but that modulation has only been characterized on a slow time scale. Recent studies have characterized a rapid signaling mode of adenosine that suggests a possible rapid modulatory role. Here, fast-scan cyclic voltammetry was used to characterize the extent to which transient adenosine changes modulate stimulated dopamine release (5 pulses at 60 Hz) in rat caudate-putamen brain slices. Exogenous adenosine was applied and dopamine concentration monitored. Adenosine only modulated dopamine when it was applied 2 or 5 s before stimulation. Longer time intervals and bath application of 5 μM adenosine did not decrease dopamine release. Mechanical stimulation of endogenous adenosine 2 s before dopamine stimulation also decreased stimulated dopamine release by 41 ± 7%, similar to the 54 ± 6% decrease in dopamine after exogenous adenosine application. Dopamine inhibition by transient adenosine was recovered within 10 min. The A1 receptor antagonist 8-cyclopentyl-1,3-dipropylxanthine blocked the dopamine modulation, whereas dopamine modulation was unaffected by the A2A receptor antagonist SCH 442416. Thus, transient adenosine changes can transiently modulate phasic dopamine release via A1 receptors. These data demonstrate that adenosine has a rapid, but transient, modulatory role in the brain. Here, transient adenosine was shown to modulate phasic dopamine release on the order of seconds by acting at the A1 receptor. However, sustained increases in adenosine did not regulate phasic dopamine release. This study demonstrates for the first time a transient, neuromodulatory function of rapid adenosine to regulate rapid neurotransmitter release.

  2. NTP pattern of avian embryonic red cells: role of RNA degradation and AMP deaminase/5'-nucleotidase activity.

    Science.gov (United States)

    Baumann, Rosemarie; Gotz, Robert; Dragon, Stefanie

    2003-03-01

    During terminal erythroid differentiation, degradation of RNA is a potential source for nucleotide triphosphates (NTPs) that act as allosteric effectors of hemoglobin. In this investigation, we assessed the developmental profile of RNA and purine/pyrimidine trinucleotides in circulating embryonic chick red blood cells (RBC). Extensive changes of the NTP pattern are observed which differ significantly from what is observed for adult RBC. The biochemical mechanisms have not been identified yet. Therefore, we studied the role of AMP deaminase and IMP/GMP 5'-nucleotidase, which are key enzymes for the regulation of the purine nucleotide pool. Finally, we tested the effect of major NTPs on the oxygen affinity of embryonic/adult hemoglobin. The results are as follows. 1) Together with ATP, UTP and CTP serve as allosteric effectors of hemoglobin. 2) Degradation of erythroid RNA is apparently a major source for NTPs. 3) Developmental changes of nucleotide content depend on the activities of key enzymes (AMP deaminase, IMP/GMP 5'-nucleotidase, and pyrimidine 5'-nucleotidase). 4) Oxygen-dependent hormonal regulation of AMP deaminase adjusts the red cell ATP concentration and therefore the hemoglobin oxygen affinity.

  3. Adenosine receptor control of cognition in normal and disease.

    Science.gov (United States)

    Chen, Jiang-Fan

    2014-01-01

    Adenosine and adenosine receptors (ARs) are increasingly recognized as important therapeutic targets for controlling cognition under normal and disease conditions for its dual roles of neuromodulation as well as of homeostatic function in the brain. This chapter first presents the unique ability of adenosine, by acting on the inhibitory A1 and facilitating A2A receptor, to integrate dopamine, glutamate, and BNDF signaling and to modulate synaptic plasticity (e.g., long-term potentiation and long-term depression) in brain regions relevant to learning and memory, providing the molecular and cellular bases for adenosine receptor (AR) control of cognition. This led to the demonstration of AR modulation of social recognition memory, working memory, reference memory, reversal learning, goal-directed behavior/habit formation, Pavlovian fear conditioning, and effort-related behavior. Furthermore, human and animal studies support that AR activity can also, through cognitive enhancement and neuroprotection, reverse cognitive impairments in animal models of Alzheimer's disease (AD), Parkinson's disease (PD), Huntington's disease, and schizophrenia. Lastly, epidemiological evidence indicates that regular human consumption of caffeine, the most widely used psychoactive drug and nonselective AR antagonists, is associated with the reduced cognitive decline in aging and AD patients, and with the reduced risk in developing PD. Thus, there is a convergence of the molecular studies revealing AR as molecular targets for integrating neurotransmitter signaling and controlling synaptic plasticity, with animal studies demonstrating the strong procognitive impact upon AR antagonism in normal and disease brains and with epidemiological and clinical evidences in support of caffeine and AR drugs for therapeutic modulation of cognition. Since some of adenosine A2A receptor antagonists are already in phase III clinical trials for motor benefits in PD patients with remarkable safety profiles

  4. Ada Compiler Validation Summary Report. Certificate Number: 891019W1. 10178, Hewlett Packard Company HP 9000 Series 800 Ada Compiler, Version 4.35 HP 9000 Series 800 Model 850. Completion of On-Site Testing: 19 October 1989

    Science.gov (United States)

    1989-10-19

    1985, the Commerce Department issued Part’ 379 Technical Data of the Export Administration specifically listing Ada Programming Support Environments...maintaining a uniform process for validation of Ada compilers. The AVO provides administrative and technical support for Ada validations to ensure...unused trailing bytes will not be appended. The principie use for the RECORD UNIT parameter is in reading and writing external files that are in

  5. 抗精神病药对精神分裂症患者血小板腺苷A2a受体基因表达的影响%Effects of antipsychotics on platelet adenosine A2a receptor gene expression in un-medicated patients with schizophrenia

    Institute of Scientific and Technical Information of China (English)

    章杰; 王俊清; 张印南; 洪晓虹; 黄庆军; 吴仁华; 许崇涛

    2011-01-01

    目的 探讨未用药精神分裂症患者治疗前后血小板腺苷A2a受体(ADA2aR) mRNA表达量的变化及其与临床症状的相关性.方法 采用实时定量聚合酶链反应技术,对30例未用药精神分裂症患者(患者组)治疗前和治疗6周后进行血小板ADA2aR mRNA表达量测定,并与30名健康志愿者(对照组)进行比较;采用Pearson相关分析对患者组血小板ADA2aR mRNA表达量与精神分裂症临床症状进行相关性分析.结果 (1)治疗前,患者组血小板ADA2aR mRNA表达量(747.6±282.3)与对照组(692.7 ±286.7)比较,差异无统计学意义(P>0.05);治疗第6周末,患者组血小板ADA2aR mRNA表达量(873.2 ±206.2)高于对照组(635.4±263.2)及患者组治疗前,差异均有统计学意义(P<0.05).(2)患者组治疗前血小板ADA2aR mRNA表达量与病程(r=0.17)、PANSS总分(r=0.08)、阳性症状(r=-0.12)、阴性症状(r=0.08)、一般病理症状(r=0.12)均无统计学相关性(P>0.05);治疗第6周末,患者组血小板ADA2aR mRNA表达量与病程PANSS总分(r=0.09)、阳性症状(r=-0.02)、阴性症状(r=0.26)、一般病理症状(r=-0.08)亦无统计学相关性(P>0.05);患者组治疗前后血小板ADA2aR mRNA表达量差值与PANSS总分减分值(r=-0.31)、阳性症状减分值(r=-0.28)、阴性症状减分值(r=-0.14)、一般病理症状减分值(r=-0.11)均无统计学相关性(P>0.05).结论 抗精神病药治疗可能对精神分裂症患者外周血小板ADA2aR基因表达产生影响,血小板ADA2aR基因表达变化可能与精神分裂症临床症状无明显联系.%Objective To explore the effects of antipsychotics on peripheric platelet mRNA level of adenosine A2a receptor (ADA2aR) in un-medicated patients with schizophrenia.Methods The mRNA level of ADA2aR in 30 un-medicated patients with schizophrenia was evaluated with real-time polymerase chain reaction (RT-PCR) at baseline and after six-week antipsychotic treatment,and 30 healthy volunteers were

  6. Adenosine gates synaptic plasticity at hippocampal mossy fiber synapses

    Science.gov (United States)

    Moore, Kimberly A.; Nicoll, Roger A.; Schmitz, Dietmar

    2003-11-01

    The release properties of synapses in the central nervous system vary greatly, not only across anatomically distinct types of synapses but also among the same class of synapse. This variation manifests itself in large part by differences in the probability of transmitter release, which affects such activity-dependent presynaptic forms of plasticity as paired-pulse facilitation and frequency facilitation. This heterogeneity in presynaptic function reflects differences in the intrinsic properties of the synaptic terminal and the activation of presynaptic neurotransmitter receptors. Here we show that the unique presynaptic properties of the hippocampal mossy fiber synapse are largely imparted onto the synapse by the continuous local action of extracellular adenosine at presynaptic A1 adenosine receptors, which maintains a low basal probability of transmitter release.

  7. Evidence for an A1-adenosine receptor in the guinea-pig atrium.

    Science.gov (United States)

    Collis, M. G.

    1983-01-01

    1 The purpose of this study was to determine whether the adenosine receptor that mediates a decrease in the force of contraction of the guinea-pig atrium is of the A1- or A2-sub-type. 2 Concentration-response curves to adenosine and a number of 5'- and N6-substituted analogues were constructed and the order of potency of the purines was: 5'-N-cyclopropylcarboxamide adenosine (NCPCA) = 5'-N-ethylcarboxamide adenosine (NECA) greater than N6cyclohexyladenosine (CHA) greater than L-N6-phenylisopropyl adenosine (L-PIA) = 2-chloroadenosine- greater than adenosine greater than D-N6-phenylisopropyl adenosine (D-PIA). 3 The difference in potency between the stereoisomers D- and L-PIA was over 100 fold. 4 The adenosine transport inhibitor, dipyridamole, potentiated submaximal responses to adenosine but had no significant effect on those evoked by the other purines. 5 Theophylline antagonized responses evoked by all purines, and with D-PIA revealed a positive inotropic effect that was abolished by atenolol. 6 The results indicate the existence of an adenosine A1-receptor in the guinea-pig atrium. PMID:6297647

  8. Adenosine-mediated modulation of ventral horn interneurons and spinal motoneurons in neonatal mice.

    Science.gov (United States)

    Witts, Emily C; Nascimento, Filipe; Miles, Gareth B

    2015-10-01

    Neuromodulation allows neural networks to adapt to varying environmental and biomechanical demands. Purinergic signaling is known to be an important modulatory system in many parts of the CNS, including motor control circuitry. We have recently shown that adenosine modulates the output of mammalian spinal locomotor control circuitry (Witts EC, Panetta KM, Miles GB. J Neurophysiol 107: 1925-1934, 2012). Here we investigated the cellular mechanisms underlying this adenosine-mediated modulation. Whole cell patch-clamp recordings were performed on ventral horn interneurons and motoneurons within in vitro mouse spinal cord slice preparations. We found that adenosine hyperpolarized interneurons and reduced the frequency and amplitude of synaptic inputs to interneurons. Both effects were blocked by the A1-type adenosine receptor antagonist DPCPX. Analysis of miniature postsynaptic currents recorded from interneurons revealed that adenosine reduced their frequency but not amplitude, suggesting that adenosine acts on presynaptic receptors to modulate synaptic transmission. In contrast to interneurons, recordings from motoneurons revealed an adenosine-mediated depolarization. The frequency and amplitude of synaptic inputs to motoneurons were again reduced by adenosine, but we saw no effect on miniature postsynaptic currents. Again these effects on motoneurons were blocked by DPCPX. Taken together, these results demonstrate differential effects of adenosine, acting via A1 receptors, in the mouse spinal cord. Adenosine has a general inhibitory action on ventral horn interneurons while potentially maintaining motoneuron excitability. This may allow for adaptation of the locomotor pattern generated by interneuronal networks while helping to ensure the maintenance of overall motor output.

  9. Pharmacology of the Adenosine A3 Receptor in the Vasculature and Essential Hypertension

    Science.gov (United States)

    Ho, Ming-Fen; Low, Leanne M.; Rose’Meyer, Roselyn B.

    2016-01-01

    Background Essential hypertension is considered to be a multifactorial disorder and its aetiology has yet to be clearly identified. As the adenosine receptors have a significant role in mediating vasodilation, alterations in their structures or signalling pathways may be involved in the development of hypertension. This study aimed to measure the expression of adenosine A3 receptors in a range of cardiovascular tissues and determine whether they could be altered with essential hypertension, and to functionally test responses to adenosine A3 receptor agonists in coronary blood vessels using the isolated perfused heart preparation. Methods mRNA samples from cardiovascular tissues and a range of blood vessels were collected from 10 week old male spontaneously hypertensive rats and age-gender matched Wistar rats (n = 8). The Langendorff heart perfusion preparation was used to characterise adenosine A3 receptor mediated coronary vasodilation in the rat heart. Results Adenosine A3 receptor agonists induced coronary vasodilation. The expression of adenosine A3 receptors in cardiovascular tissues was altered in a tissue-specific pattern. Specifically, down-regulation of adenosine A3 receptor expression occurred in hypertensive hearts, which might be associated with attenuated vasodilator responses observed in coronary vessels to adenosine A3 receptor agonists. Conclusions This study demonstrated alterations in the expression of adenosine A3 receptors occurred in a tissue specific mode, and reduced adenosine A3 receptor mediated coronary vasodilation in hearts from spontaneously hypertensive rats. Our findings with regard to changes in the adenosine A3 receptor in hypertensive hearts suggest that adenosine A3 receptor might play a role in the physiopathology of essential hypertension and potentially open the way to pharmacologic manipulation of vasomotor activity by the use of adenosine A3 receptor agonists. PMID:26907173

  10. Ada Compiler Validation Summary Report: Certificate Number: 910918S1.11217, NEC Corporation, NEC Ada Compiler System for EWS-UX/V to V70/RX-UX832, Version 1.0 EWS 4800/60 = MV4000

    Science.gov (United States)

    1991-01-01

    8217 The Ada~ System generator 30 I OPTIONS AND COMMANDS OF THE PLU 1 Options and Commands of The PLU The Program Library Utility (PLU) of NEC Ada...myprogram 4 OPTIONS FOR THE ADA SYSTEM GENERATOR 30 The linker will include the code in Obj ectFile. o in the linkage of the program "myprogram". This...program presumably features a program interface to some routines appearing in the ObjectFile. 4 Options for The Ada System generator asgv70 is a

  11. Adenosine receptors and stress : Studies using methylmercury, caffeine and hypoxia

    OpenAIRE

    Björklund, Olga

    2008-01-01

    Brain development is a precisely organized process that can be disturbed by various stress factors present in the diet (e.g. exposure to xenobiotics) as well as insults such as decreased oxygen supply. The consequent adverse changes in nervous system function may not necessarily be apparent until a critical age when neurodevelopmental defects may be unmasked by a subsequent challenge. Adenosine and its receptors (AR) (A1, A2A, A2B and A3) which participate in the brain stres...

  12. Activation-induced cytidine deaminase (AID) is localized to subnuclear domains enriched in splicing factors

    Energy Technology Data Exchange (ETDEWEB)

    Hu, Yi, E-mail: yihooyi@gmail.com; Ericsson, Ida, E-mail: ida.ericsson@ntnu.no; Doseth, Berit, E-mail: berit.doseth@ntnu.no; Liabakk, Nina B., E-mail: nina.beate.liabakk@ntnu.no; Krokan, Hans E., E-mail: hans.krokan@ntnu.no; Kavli, Bodil, E-mail: bodil.kavli@ntnu.no

    2014-03-10

    Activation-induced cytidine deaminase (AID) is the mutator enzyme in adaptive immunity. AID initiates the antibody diversification processes in activated B cells by deaminating cytosine to uracil in immunoglobulin genes. To some extent other genes are also targeted, which may lead to genome instability and B cell malignancy. Thus, it is crucial to understand its targeting and regulation mechanisms. AID is regulated at several levels including subcellular compartmentalization. However, the complex nuclear distribution and trafficking of AID has not been studied in detail previously. In this work, we examined the subnuclear localization of AID and its interaction partner CTNNBL1 and found that they associate with spliceosome-associated structures including Cajal bodies and nuclear speckles. Moreover, protein kinase A (PKA), which activates AID by phosphorylation at Ser38, is present together with AID in nuclear speckles. Importantly, we demonstrate that AID physically associates with the major spliceosome subunits (small nuclear ribonucleoproteins, snRNPs), as well as other essential splicing components, in addition to the transcription machinery. Based on our findings and the literature, we suggest a transcription-coupled splicing-associated model for AID targeting and activation. - Highlights: • AID and its interaction partner CTNNBL1 localize to Cajal bodies and nuclear speckles. • AID associates with its activating kinase PKA in nuclear speckles. • AID is linked to the splicing machinery in switching B-cells. • Our findings suggest a transcription-coupled splicing associated mechanism for AID targeting and activation.

  13. Degradation of the cancer genomic DNA deaminase APOBEC3B by SIV Vif.

    Science.gov (United States)

    Land, Allison M; Wang, Jiayi; Law, Emily K; Aberle, Ryan; Kirmaier, Andrea; Krupp, Annabel; Johnson, Welkin E; Harris, Reuben S

    2015-11-24

    APOBEC3B is a newly identified source of mutation in many cancers, including breast, head/neck, lung, bladder, cervical, and ovarian. APOBEC3B is a member of the APOBEC3 family of enzymes that deaminate DNA cytosine to produce the pro-mutagenic lesion, uracil. Several APOBEC3 family members function to restrict virus replication. For instance, APOBEC3D, APOBEC3F, APOBEC3G, and APOBEC3H combine to restrict HIV-1 in human lymphocytes. HIV-1 counteracts these APOBEC3s with the viral protein Vif, which targets the relevant APOBEC3s for proteasomal degradation. While APOBEC3B does not restrict HIV-1 and is not targeted by HIV-1 Vif in CD4-positive T cells, we asked whether related lentiviral Vif proteins could degrade APOBEC3B. Interestingly, several SIV Vif proteins are capable of promoting APOBEC3B degradation, with SIVmac239 Vif proving the most potent. This likely occurs through the canonical polyubiquitination mechanism as APOBEC3B protein levels are restored by MG132 treatment and by altering a conserved E3 ligase-binding motif. We further show that SIVmac239 Vif can prevent APOBEC3B mediated geno/cytotoxicity and degrade endogenous APOBEC3B in several cancer cell lines. Our data indicate that the APOBEC3B degradation potential of SIV Vif is an effective tool for neutralizing the cancer genomic DNA deaminase APOBEC3B. Further optimization of this natural APOBEC3 antagonist may benefit cancer therapy.

  14. Structural insights into E. coli porphobilinogen deaminase during synthesis and exit of 1-hydroxymethylbilane.

    Directory of Open Access Journals (Sweden)

    Navneet Bung

    2014-03-01

    Full Text Available Porphobilinogen deaminase (PBGD catalyzes the formation of 1-hydroxymethylbilane (HMB, a crucial intermediate in tetrapyrrole biosynthesis, through a step-wise polymerization of four molecules of porphobilinogen (PBG, using a unique dipyrromethane (DPM cofactor. Structural and biochemical studies have suggested residues with catalytic importance, but their specific role in the mechanism and the dynamic behavior of the protein with respect to the growing pyrrole chain remains unknown. Molecular dynamics simulations of the protein through the different stages of pyrrole chain elongation suggested that the compactness of the overall protein decreases progressively with addition of each pyrrole ring. Essential dynamics showed that domains move apart while the cofactor turn region moves towards the second domain, thus creating space for the pyrrole rings added at each stage. Residues of the flexible active site loop play a significant role in its modulation. Steered molecular dynamics was performed to predict the exit mechanism of HMB from PBGD at the end of the catalytic cycle. Based on the force profile and minimal structural changes the proposed path for the exit of HMB is through the space between the domains flanking the active site loop. Residues reported as catalytically important, also play an important role in the exit of HMB. Further, upon removal of HMB, the structure of PBGD gradually relaxes to resemble its initial stage structure, indicating its readiness to resume a new catalytic cycle.

  15. Adaptive evolution of threonine deaminase in plant defense against insect herbivores

    Energy Technology Data Exchange (ETDEWEB)

    Gonzales-Vigil, Eliana; Bianchetti, Christopher M.; Phillips, Jr., George N.; Howe, Gregg A. (MSU); (UW)

    2011-11-07

    Gene duplication is a major source of plant chemical diversity that mediates plant-herbivore interactions. There is little direct evidence, however, that novel chemical traits arising from gene duplication reduce herbivory. Higher plants use threonine deaminase (TD) to catalyze the dehydration of threonine (Thr) to {alpha}-ketobutyrate and ammonia as the committed step in the biosynthesis of isoleucine (Ile). Cultivated tomato and related Solanum species contain a duplicated TD paralog (TD2) that is coexpressed with a suite of genes involved in herbivore resistance. Analysis of TD2-deficient tomato lines showed that TD2 has a defensive function related to Thr catabolism in the gut of lepidopteran herbivores. During herbivory, the regulatory domain of TD2 is removed by proteolysis to generate a truncated protein (pTD2) that efficiently degrades Thr without being inhibited by Ile. We show that this proteolytic activation step occurs in the gut of lepidopteran but not coleopteran herbivores, and is catalyzed by a chymotrypsin-like protease of insect origin. Analysis of purified recombinant enzymes showed that TD2 is remarkably more resistant to proteolysis and high temperature than the ancestral TD1 isoform. The crystal structure of pTD2 provided evidence that electrostatic interactions constitute a stabilizing feature associated with adaptation of TD2 to the extreme environment of the lepidopteran gut. These findings demonstrate a role for gene duplication in the evolution of a plant defense that targets and co-opts herbivore digestive physiology.

  16. The Role of Histidine-Proline-Rich Glycoprotein as Zinc Chaperone for Skeletal Muscle AMP Deaminase

    Directory of Open Access Journals (Sweden)

    Maria Ranieri-Raggi

    2014-05-01

    Full Text Available Metallochaperones function as intracellular shuttles for metal ions. At present, no evidence for the existence of any eukaryotic zinc-chaperone has been provided although metallochaperones could be critical for the physiological functions of Zn2+ metalloenzymes. We propose that the complex formed in skeletal muscle by the Zn2+ metalloenzyme AMP deaminase (AMPD and the metal binding protein histidine-proline-rich glycoprotein (HPRG acts in this manner. HPRG is a major plasma protein. Recent investigations have reported that skeletal muscle cells do not synthesize HPRG but instead actively internalize plasma HPRG. X-ray absorption spectroscopy (XAS performed on fresh preparations of rabbit skeletal muscle AMPD provided evidence for a dinuclear zinc site in the enzyme compatible with a (μ-aqua(μ-carboxylatodizinc(II core with two histidine residues at each metal site. XAS on HPRG isolated from the AMPD complex showed that zinc is bound to the protein in a dinuclear cluster where each Zn2+ ion is coordinated by three histidine and one heavier ligand, likely sulfur from cysteine. We describe the existence in mammalian HPRG of a specific zinc binding site distinct from the His-Pro-rich region. The participation of HPRG in the assembly and maintenance of skeletal muscle AMPD by acting as a zinc chaperone is also demonstrated.

  17. Kinetic studies on 2',2'-difluorodeoxycytidine (Gemcitabine) with purified human deoxycytidine kinase and cytidine deaminase.

    Science.gov (United States)

    Bouffard, D Y; Laliberté, J; Momparler, R L

    1993-05-05

    Phosphorylation of cytosine analogs by deoxycytidine kinase (dCK) and deamination by cytidine deaminase (CDA) are two important processes in the activation and elimination of these drugs. We have investigated the kinetic parameters of 2',2'-difluorodeoxycytidine (dFdC) using purified enzymes from human cells. Deoxycytidine (CdR) and dFdC had Km values of 1.5 and 4.6 microM for dCK, respectively. Feedback inhibition of dCK by deoxycytidine 5'-triphosphate (dCTP) was also studied. Our results show that dCTP produced a greater inhibition of the phosphorylation of dFdC than CdR with concentrations of dCTP ranging from 1 to 25 microM. dFdC was a good substrate for CDA. Kinetic studies with this enzyme gave Km values for CdR and dFdC of 46.3 and 95.7 microM, respectively. The effect of competitive inhibitors of CDA on the deamination of dFdC was also investigated. Diazepinone riboside was a more potent inhibitor than tetrahydrouridine using either CdR or dFdC as the substrate. Inhibitors of CDA could be useful in clinical trials in patients with cancer to increase the chemotherapeutic effectiveness of dFdC.

  18. Activation-induced cytidine deaminase deficiency causes organ-specific autoimmune disease.

    Directory of Open Access Journals (Sweden)

    Koji Hase

    Full Text Available Activation-induced cytidine deaminase (AID expressed by germinal center B cells is a central regulator of somatic hypermutation (SHM and class switch recombination (CSR. Humans with AID mutations develop not only the autosomal recessive form of hyper-IgM syndrome (HIGM2 associated with B cell hyperplasia, but also autoimmune disorders by unknown mechanisms. We report here that AID-/- mice spontaneously develop tertiary lymphoid organs (TLOs in non-lymphoid tissues including the stomach at around 6 months of age. At a later stage, AID-/- mice develop a severe gastritis characterized by loss of gastric glands and epithelial hyperplasia. The disease development was not attenuated even under germ-free (GF conditions. Gastric autoantigen -specific serum IgM was elevated in AID-/- mice, and the serum levels correlated with the gastritis pathological score. Adoptive transfer experiments suggest that autoimmune CD4+ T cells mediate gastritis development as terminal effector cells. These results suggest that abnormal B-cell expansion due to AID deficiency can drive B-cell autoimmunity, and in turn promote TLO formation, which ultimately leads to the propagation of organ-specific autoimmune effector CD4+ T cells. Thus, AID plays an important role in the containment of autoimmune diseases by negative regulation of autoreactive B cells.

  19. Camouflage Patterning in Maize Leaves Results from a Defect in Porphobilinogen Deaminase

    Institute of Scientific and Technical Information of China (English)

    Mingshu Huang; Thomas L.Slewinski; R.Frank Baker; Diane Janick-Buckner; Brent Buckner; Gurmukh S.Johal; David M.Braun

    2009-01-01

    Maize leaves are produced from polarized cell divisions that result in clonal cell lineages arrayed along the long axis of the leaf.We utilized this stereotypical division pattern to identify a collection of mutants that form chloroplast pigmentation sectors that violate the clonal cell lineages.Here,we describe the camouflage1 (cf1) mutant,which develops nonclonal,yellow-green sectors in its leaves.We cloned the cf1 gene by transposon tagging and determined that it encodes porphobilinogen deaminase (PBGD),an enzyme that functions early in chlorophyll and heme biosynthesis.While PBGD has been characterized biochemically,no viable mutations in this gene have been reported in plants.To investigate the in vivo function of PBGD,we characterized the cf1 mutant.Histological analyses revealed that of 1 yellow sectors display the novel phenotype of bundle sheath cell-specific death.Light-shift experiments determined that constant light suppressed cf1 sector formation,a dark/light transition is required to induce yellow sectors,and that sectors form only during a limited time of leaf development.Biochemical experiments determined that cf1 mutant leaves have decreased PBGD activity and increased levels of the enzyme substrate in both green and yellow regions.Furthermore,the cf1 yellow regions displayed a reduction in catalase activity.A threshold model is hypothesized to explain the cf1 variegation and incorporates photosynthetic cell differentiation,reactive oxygen species scavenging,and PBGD function.

  20. Target DNA sequence directly regulates the frequency of activation-induced deaminase-dependent mutations.

    Science.gov (United States)

    Chen, Zhangguo; Viboolsittiseri, Sawanee S; O'Connor, Brian P; Wang, Jing H

    2012-10-15

    Activation-induced deaminase (AID) catalyses class switch recombination (CSR) and somatic hypermutation (SHM) in B lymphocytes to enhance Ab diversity. CSR involves breaking and rejoining highly repetitive switch (S) regions in the IgH (Igh) locus. S regions appear to be preferential targets of AID. To determine whether S region sequence per se, independent of Igh cis regulatory elements, can influence AID targeting efficiency and mutation frequency, we established a knock-in mouse model by inserting a core Sγ1 region into the first intron of proto-oncogene Bcl6, which is a non-Ig target of SHM. We found that the mutation frequency of the inserted Sγ1 region was dramatically higher than that of the adjacent Bcl6 endogenous sequence. Mechanistically, S region-enhanced SHM was associated with increased recruitment of AID and RNA polymerase II, together with Spt5, albeit to a lesser extent. Our studies demonstrate that target DNA sequences influence mutation frequency via regulating AID recruitment. We propose that the nucleotide sequence preference may serve as an additional layer of AID regulation by restricting its mutagenic activity to specific sequences despite the observation that AID has the potential to access the genome widely.

  1. Evolution of class switch recombination function in fish activation-induced cytidine deaminase, AID.

    Science.gov (United States)

    Wakae, Koshou; Magor, Brad G; Saunders, Holly; Nagaoka, Hitoshi; Kawamura, Akemi; Kinoshita, Kazuo; Honjo, Tasuku; Muramatsu, Masamichi

    2006-01-01

    Following activation of mammalian B cells, class switch recombination (CSR) and somatic hypermutation (SHM) of the Ig heavy chain (IgH) gene can improve the functions of the expressed antibodies. Activation-induced cytidine deaminase (AID) is the only known B cell-specific protein required for inducing CSR and SHM in mammals. Lower vertebrates have an AID homologue, and there is some evidence of SHM in vivo. However there is no evidence of CSR in the cartilaginous or bony fishes, and this may be due in part to a lack of cis-elements in the IgH gene that are the normal targets of AID-mediated recombination. We have tested whether bony fish (zebrafish and catfish) AID can mediate CSR and SHM in mammalian cells. As expected, ectopic expression of fish AID in mouse fibroblasts resulted in mutations in an introduced SHM reporter gene, indicating that fish AID can mediate SHM. Unexpectedly, expression of fish AID in mouse AID-/- B cells induced surface IgG expression as well as switched transcripts from Ig gene loci, clearly indicating that the fish AID protein can mediate CSR, at least in mouse cells. These results suggest that the AID protein acquired the ability to mediate CSR before the IgH locus evolved the additional exon clusters and switch regions that are the targets of recombination. We discuss how pleiotropic functions of specific domains within the AID protein may have facilitated the early evolution of CSR in lower vertebrates.

  2. Glucose metabolism during fasting is altered in experimental porphobilinogen deaminase deficiency.

    Science.gov (United States)

    Collantes, María; Serrano-Mendioroz, Irantzu; Benito, Marina; Molinet-Dronda, Francisco; Delgado, Mercedes; Vinaixa, María; Sampedro, Ana; Enríquez de Salamanca, Rafael; Prieto, Elena; Pozo, Miguel A; Peñuelas, Iván; Corrales, Fernando J; Barajas, Miguel; Fontanellas, Antonio

    2016-04-01

    Porphobilinogen deaminase (PBGD) haploinsufficiency (acute intermittent porphyria, AIP) is characterized by neurovisceral attacks when hepatic heme synthesis is activated by endogenous or environmental factors including fasting. While the molecular mechanisms underlying the nutritional regulation of hepatic heme synthesis have been described, glucose homeostasis during fasting is poorly understood in porphyria. Our study aimed to analyse glucose homeostasis and hepatic carbohydrate metabolism during fasting in PBGD-deficient mice. To determine the contribution of hepatic PBGD deficiency to carbohydrate metabolism, AIP mice injected with a PBGD-liver gene delivery vector were included. After a 14 h fasting period, serum and liver metabolomics analyses showed that wild-type mice stimulated hepatic glycogen degradation to maintain glucose homeostasis while AIP livers activated gluconeogenesis and ketogenesis due to their inability to use stored glycogen. The serum of fasted AIP mice showed increased concentrations of insulin and reduced glucagon levels. Specific over-expression of the PBGD protein in the liver tended to normalize circulating insulin and glucagon levels, stimulated hepatic glycogen catabolism and blocked ketone body production. Reduced glucose uptake was observed in the primary somatosensorial brain cortex of fasted AIP mice, which could be reversed by PBGD-liver gene delivery. In conclusion, AIP mice showed a different response to fasting as measured by altered carbohydrate metabolism in the liver and modified glucose consumption in the brain cortex. Glucose homeostasis in fasted AIP mice was efficiently normalized after restoration of PBGD gene expression in the liver.

  3. Tetrahydrouridine inhibits cell proliferation through cell cycle regulation regardless of cytidine deaminase expression levels.

    Directory of Open Access Journals (Sweden)

    Naotake Funamizu

    Full Text Available Tetrahydrouridine (THU is a well characterized and potent inhibitor of cytidine deaminase (CDA. Highly expressed CDA catalyzes and inactivates cytidine analogues, ultimately contributing to increased gemcitabine resistance. Therefore, a combination therapy of THU and gemcitabine is considered to be a potential and promising treatment for tumors with highly expressed CDA. In this study, we found that THU has an alternative mechanism for inhibiting cell growth which is independent of CDA expression. Three different carcinoma cell lines (MIAPaCa-2, H441, and H1299 exhibited decreased cell proliferation after sole administration of THU, while being unaffected by knocking down CDA. To investigate the mechanism of THU-induced cell growth inhibition, cell cycle analysis using flow cytometry was performed. This analysis revealed that THU caused an increased rate of G1-phase occurrence while S-phase occurrence was diminished. Similarly, Ki-67 staining further supported that THU reduces cell proliferation. We also found that THU regulates cell cycle progression at the G1/S checkpoint by suppressing E2F1. As a result, a combination regimen of THU and gemcitabine might be a more effective therapy than previously believed for pancreatic carcinoma since THU works as a CDA inhibitor, as well as an inhibitor of cell growth in some types of pancreatic carcinoma cells.

  4. Involvement of activation-induced cytidine deaminase in skin cancer development.

    Science.gov (United States)

    Nonaka, Taichiro; Toda, Yoshinobu; Hiai, Hiroshi; Uemura, Munehiro; Nakamura, Motonobu; Yamamoto, Norio; Asato, Ryo; Hattori, Yukari; Bessho, Kazuhisa; Minato, Nagahiro; Kinoshita, Kazuo

    2016-04-01

    Most skin cancers develop as the result of UV light-induced DNA damage; however, a substantial number of cases appear to occur independently of UV damage. A causal link between UV-independent skin cancers and chronic inflammation has been suspected, although the precise mechanism underlying this association is unclear. Here, we have proposed that activation-induced cytidine deaminase (AID, encoded by AICDA) links chronic inflammation and skin cancer. We demonstrated that Tg mice expressing AID in the skin spontaneously developed skin squamous cell carcinoma with Hras and Trp53 mutations. Furthermore, genetic deletion of Aicda reduced tumor incidence in a murine model of chemical-induced skin carcinogenesis. AID was expressed in human primary keratinocytes in an inflammatory stimulus-dependent manner and was detectable in human skin cancers. Together, the results of this study indicate that inflammation-induced AID expression promotes skin cancer development independently of UV damage and suggest AID as a potential target for skin cancer therapeutics.

  5. miR-181b negatively regulates activation-induced cytidine deaminase in B cells.

    Science.gov (United States)

    de Yébenes, Virginia G; Belver, Laura; Pisano, David G; González, Susana; Villasante, Aranzazu; Croce, Carlo; He, Lin; Ramiro, Almudena R

    2008-09-29

    Activated B cells reshape their primary antibody repertoire after antigen encounter by two molecular mechanisms: somatic hypermutation (SHM) and class switch recombination (CSR). SHM and CSR are initiated by activation-induced cytidine deaminase (AID) through the deamination of cytosine residues on the immunoglobulin loci, which leads to the generation of DNA mutations or double-strand break intermediates. As a bystander effect, endogenous AID levels can also promote the generation of chromosome translocations, suggesting that the fine tuning of AID expression may be critical to restrict B cell lymphomagenesis. To determine whether microRNAs (miRNAs) play a role in the regulation of AID expression, we performed a functional screening of an miRNA library and identified miRNAs that regulate CSR. One such miRNA, miR-181b, impairs CSR when expressed in activated B cells, and results in the down-regulation of AID mRNA and protein levels. We found that the AID 3' untranslated region contains multiple putative binding sequences for miR-181b and that these sequences can be directly targeted by miR-181b. Overall, our results provide evidence for a new regulatory mechanism that restricts AID activity and can therefore be relevant to prevent B cell malignant transformation.

  6. Adenosine receptors in post-mortem human brain.

    Science.gov (United States)

    James, S; Xuereb, J H; Askalan, R; Richardson, P J

    1992-01-01

    1. Adenosine A2-like binding sites were characterized in post-mortem human brain membranes by examining several compounds for their ability to displace [3H]-CGS 21680 (2[p-(2 carboxyethyl)-phenethylamino]-5'-N-ethylcarboxamido adenosine) binding. 2. Two A2-like binding sites were identified in the striatum. 3. The more abundant striatal site was similar to the A2a receptor previously described in rat striatum, both in its pharmacological profile and striatal localization. 4. The less abundant striatal site had a pharmacological profile similar to that of the binding site characterized in the other brain regions examined. This was intermediate in character between A1 and A2 and may represent another adenosine receptor subtype. 5. The co-purification of [3H]-CGS 21680 binding during immunoisolation of human striatal cholinergic membranes was used to assess the possible cholinergic localization of A2-like binding sites in the human striatum. Only the more abundant striatal site co-purified with cholinergic membranes. This suggests that this A2a-like site is present on cholinergic neurones in the human striatum.

  7. Cell surface and transcriptional characterization of human adipose-derived adherent stromal (hADAS) cells.

    Science.gov (United States)

    Katz, Adam J; Tholpady, Ashok; Tholpady, Sunil S; Shang, Hulan; Ogle, Roy C

    2005-03-01

    Adult human subcutaneous adipose tissue contains cells with intriguing multilineage developmental plasticity, much like marrow-derived mesenchymal stem cells. Putative stem or progenitor cells from fat have been given many different names in the literature, reflecting an early and evolving consensus regarding their phenotypic characterization. The study reported here used microarrays to evaluate over 170 genes relating to angiogenesis and extracellular matrix in undifferentiated, early-passage human adipose-derived adherent stromal (hADAS) cells isolated from three separate donors. The hADAS populations unanimously transcribed 66% of the screened genes, and 83% were transcribed by at least two of the three populations. The most highly transcribed genes relate to functional groupings such as cell adhesion, matrix proteins, growth factors and receptors, and proteases. The transcriptome of hADAS cells demonstrated by this work reveals many similarities to published profiles of bone marrow mesenchymal stem cells (MSCs). In addition, flow analysis of over 24 hADAS cell surface proteins (n = 7 donors) both confirms and expands on the existing literature and reveals strong intergroup correlation, despite an inconsistent nomenclature and the lack of standardized protocols for cell isolation and culture. Finally, based on flow analysis and reverse transcription polymerase chain reaction studies, our results suggest that hADAS cells do not express several proteins that are implicated as markers of "stemness" in other stem cell populations, including telomerase, CD133, and the membrane transporter ABCG2.

  8. Contraction induced secretion of VEGF from skeletal muscle cells is mediated by adenosine

    DEFF Research Database (Denmark)

    Høier, Birgitte; Olsen, Karina; Nyberg, Michael Permin

    2010-01-01

    The role of adenosine and contraction for secretion of VEGF in skeletal muscle was investigated in human subjects and rat primary skeletal muscle cells. Microdialysis probes were inserted into the thigh muscle of seven male subjects and dialysate was collected at rest, during infusion of adenosine...... and contraction caused secretion of VEGF (pcontraction induced secretion of VEGF protein was abolished by the A(2B) antagonist enprofyllin and markedly reduced by inhibition of PKA or MAPK. The results demonstrate that adenosine causes secretion of VEGF from human skeletal muscle cells...... and that the contraction induced secretion of VEGF is partially mediated via adenosine acting on A(2B) adenosine receptors. Moreover, the contraction induced secretion of VEGF protein from muscle is dependent on both PKA and MAPK activation, but only the MAPK pathway appears to be adenosine dependent....

  9. [Effects of dopamine and adenosine on regulation of water-electrolyte exchange in Amoeba proteus].

    Science.gov (United States)

    Bagrov, Ia Iu; Manusova, N B

    2014-01-01

    Dopamine and adenosine both regulate transport of sodium chloride in the renal tubules in mammals. We have studied the effect of dopamine and adenosine on spontaneous activity of contractile vacuole of Amoeba proteous. Both substances stimulated contractile vacuole. The effect of dopamine was suppressed by D2 receptor antagonist, haloperidol, but not by D1 antagonist, SCH 39166. Adenylate cyclase inhibitor, 2.5-dideoxyadenosine, suppressed the effect of dopamine, but not of adenosine. Inhibitor of protein kinase C, staurosporine, in contrast, blocked the effect of adenosine, but not dopamine. Notably, dopamine opposed effect of adenosine and vice versa. These results suggest that similar effects of dopamine and adenosine could be mediated by different intracellulare mechanisms.

  10. Acute hyperammonemia and systemic inflammation is associated with increased extracellular brain adenosine in rats

    DEFF Research Database (Denmark)

    Bjerring, Peter Nissen; Dale, Nicholas; Larsen, Fin Stolze

    2015-01-01

    Acute liver failure (ALF) can lead to brain edema, cerebral hyperperfusion and intracranial hypertension. These complications are thought to be mediated by hyperammonemia and inflammation leading to altered brain metabolism. As increased levels of adenosine degradation products have been found...... in brain tissue of patients with ALF we investigated whether hyperammonemia could induce adenosine release in brain tissue. Since adenosine is a potent vasodilator and modulator of cerebral metabolism we furthermore studied the effect of adenosine receptor ligands on intracranial pressure (ICP......) and cerebral blood flow (CBF). We measured the adenosine concentration with biosensors in rat brain slices exposed to ammonia and in a rat model with hyperammonemia and systemic inflammation. Exposure to ammonia in concentrations from 0.15-10 mM led to increases in the cortical adenosine concentration up to 18...

  11. Crystal Structure of Schistosoma mansoni Adenosine Phosphorylase/5’-Methylthioadenosine Phosphorylase and Its Importance on Adenosine Salvage Pathway

    Science.gov (United States)

    Torini, Juliana Roberta; Brandão-Neto, José; DeMarco, Ricardo; Pereira, Humberto D'Muniz

    2016-01-01

    Schistosoma mansoni do not have de novo purine pathways and rely on purine salvage for their purine supply. It has been demonstrated that, unlike humans, the S. mansoni is able to produce adenine directly from adenosine, although the enzyme responsible for this activity was unknown. In the present work we show that S. mansoni 5´-deoxy-5´-methylthioadenosine phosphorylase (MTAP, E.C. 2.4.2.28) is capable of use adenosine as a substrate to the production of adenine. Through kinetics assays, we show that the Schistosoma mansoni MTAP (SmMTAP), unlike the mammalian MTAP, uses adenosine substrate with the same efficiency as MTA phosphorolysis, which suggests that this enzyme is part of the purine pathway salvage in S. mansoni and could be a promising target for anti-schistosoma therapies. Here, we present 13 SmMTAP structures from the wild type (WT), including three single and one double mutant, and generate a solid structural framework for structure description. These crystal structures of SmMTAP reveal that the active site contains three substitutions within and near the active site when compared to it mammalian counterpart, thus opening up the possibility of developing specific inhibitors to the parasite MTAP. The structural and kinetic data for 5 substrates reveal the structural basis for this interaction, providing substract for inteligent design of new compounds for block this enzyme activity. PMID:27935959

  12. Ada Compiler Validation Summary Report: Certificate Number: 920509S1. 11259 Alenia Aeritalia and Selenia S.p.A DACS VAX/VMS to 80x86 PM MARA Ada Cross Compiler, Version 4.6 Microvax 4000/200 => MARA

    Science.gov (United States)

    1992-01-01

    INTERFACE exc. non ADA ------- v codice ADA exception ADA AH A AI .1 I sistema operativo exc. non ADA ------- - fig. 1- Function Exception Handling is...identification of page terminator can be penalized when teletype characterization is used to handle serial communication lines connected to host computers. In

  13. Interaction between Intrathecal Gabapentin and Adenosine in the Formalin Test of Rats

    OpenAIRE

    Yoon, Myung Ha; Choi, Jeong Il; Park, Heon Chang; Bae, Hong Beom

    2004-01-01

    Spinal gabapentin and adenosine have been known to display an antinociceptive effect. We evaluated the nature of the interaction between gabapentin and adenosine in formalin-induced nociception at the spinal level. Male Sprague-Dawley rats were prepared for intrathecal catheterization. Pain was evoked by injection of formalin solution (5%, 50 µL) into the hindpaw. After examination of the effects of gabapentin and adenosine, the resulting interaction was investigated with isobolographic and f...

  14. Adenosine A2A Receptors Modulate Acute Injury and Neuroinflammation in Brain Ischemia.

    OpenAIRE

    Felicita Pedata; Anna Maria Pugliese; Elisabetta Coppi; Ilaria Dettori; Giovanna Maraula; Lucrezia Cellai; Alessia Melani

    2014-01-01

    The extracellular concentration of adenosine in the brain increases dramatically during ischemia. Adenosine A2A receptor is expressed in neurons and glial cells and in inflammatory cells (lymphocytes and granulocytes). Recently, adenosine A2A receptor emerged as a potential therapeutic attractive target in ischemia. Ischemia is a multifactorial pathology characterized by different events evolving in the time. After ischemia the early massive increase of extracellular glutamate is followed by ...

  15. Endogenous adenosine and hemorrhagic shock: effects of caffeine administration or caffeine withdrawal.

    OpenAIRE

    Conlay, L A; Evoniuk, G; Wurtman, R.J.

    1988-01-01

    Plasma adenosine concentrations doubled when rats were subjected to 90 min of profound hemorrhagic shock. Administration of caffeine (20 mg per kg of body weight), an adenosine-receptor antagonist, attenuated the hemorrhage-induced decrease in blood pressure. In contrast, chronic caffeine consumption (0.1% in drinking water), followed by a brief period of caffeine withdrawal, amplified the hypotensive response to hemorrhage. These data suggest that endogenous adenosine participates in the hyp...

  16. Topical adenosine increases the proportion of thick hair in Caucasian men with androgenetic alopecia.

    Science.gov (United States)

    Iwabuchi, Tokuro; Ideta, Ritsuro; Ehama, Ritsuko; Yamanishi, Haruyo; Iino, Masato; Nakazawa, Yosuke; Kobayashi, Takashi; Ohyama, Manabu; Kishimoto, Jiro

    2016-05-01

    Adenosine is an effective treatment for androgenetic alopecia (AGA) in Japanese men and women. Adenosine exerts its effects by significantly increasing the proportion of thick hair. In this study, we assessed the clinical outcome of adenosine treatment for 6 months in 38 Caucasian men. The change in proportion of thick hair (≥60 μm) compared with baseline in the adenosine group was significantly higher than that in the placebo group (P thick hair in Caucasian men with AGA as well as in Japanese men and women.

  17. Adenosine Modulates the Oocyte Developmental Competence by Exposing Stages and Synthetic Blocking during In Vitro Maturation.

    Science.gov (United States)

    Cheon, Yong-Pil

    2016-06-01

    Purine metabolism is known factor for nuclear maturation of oocytes through both follicle cells and oocyte itself. However, it is largely unknown the roles of purine metabolism in the oocyte competence for fertilization and early development. In this study, the effects of adenosine in oocyte competence for development were examined using adenosine and its synthetic inhibitors. Adenosine treatment from GV intact stage for 18 hr (fGV) caused of decrease the fertilization rate but of increase the cleavage rate compared from the other stage treatment groups. Hadacidin did not effect on fertilization rate but increased cleavage rate without stage specificity. Adenosine did not block the effects of hadacidin with the exception of fGV group. By the inhibition of purine synthetic pathways the fertilization rate was decreased in the fGV and fGVB groups but increased in the fMII group. Exogenous adenosine caused of decrease fertilization rate in the fGVB group but increase in the fMII group. Cleavage rate was dramatically increased in the adenosine treatment with synthetic inhibitors. It means that the metabolism of purine has stage specific effects on fertilization and cleavage. Exogenous adenosine had only can improve oocyte developmental competence when it treated at GV intact stage. On the other hand, endogenous synthesis in all maturation stage caused of increase the cleavage rate without effects on fertilization. These data suggest that adenosine at GV stage as a paracrine fashion and inhibitions of endogenous adenosine in all stage improve oocyte developmental competence..

  18. Improved AdaBoost ensemble approach based on loss function%基于损失函数的AdaBoost改进算法

    Institute of Scientific and Technical Information of China (English)

    雷蕾; 王晓丹

    2012-01-01

    针对AdaBoost集成时难分样本权重扩张导致训练样本在更新时分布失衡的问题,提出一种基于正负类样本损失函数(LF)的权重更新策略.权重的调整不仅与训练误差有关,还考虑到基分类器对不同类别样本的正确分类能力,从而避免训练样本过度集中于某一类的异常现象.实验结果表明,基于LF的AdaBoost能在提高收敛性能的情况下,提高算法精度,克服样本分布失衡问题.偏差方差分析的结果显示,该算法在改善偏差的情况下,能有效地减小错误率中的方差成分,提高集成的泛化能力.%As to the issue that the weight expansion for hardest samples can cause imbalance when updating the training sample in AdaBoost algorithm, an improved approach based on the Loss Function (LF) of the different patterns, namely, LF-AdaBoost, was proposed. The weight tuning was affected not only by the training error, but the performance of base classifiers for different classes, thus avoiding the excessive concentration phenomenon. The results based on UCI data sets and different base classifiers have shown that the approach can improve the speed of convergence and overcome the imbalance,as well as promote the generalization ability of ensemble classifier.

  19. AdaBoost人脸检测算法在DSP上的移植与优化%Transplantation and optimization of AdaBoost face detection algorithm on DSP

    Institute of Scientific and Technical Information of China (English)

    朱明; 陆小锋; 陆亨立; 李莹娇; 张东升

    2014-01-01

    将Viola等人提出的AdaBoost人脸检测算法由PC机移植到TMS320DM642嵌入式平台,采用EMCV (Embedded Computer Vision Library)移植方案,将PC平台的OpenCV(Open Source Computer Vision Library)视觉库中有关AdaBoost算法的模块修改使之适应嵌入式DSP平台。该移植工作主要解决了OpenCV在嵌入式平台的不兼容问题以及不同体系架构的编译器环境和库文件导致的编译和链接错误。优化工作在TI的编译器CCS中进行,在编译器平台下进行C语言的项目及程序优化,并进行了大量实验数据的对比,给出了优化的方案,对实现系统的实时性有指导性作用。%This paper transplants the AdaBoost algorithm proposed by Viola from PC platform to TMS320DM642 platform. The transplantation solves the compile problem caused by the difference between PC and DSP platform. The algorithm optimization is proceeding in CCS compiler which is provided by Texas Instruments. The paper optimizes the AdaBoost algorithm by the optimization of C code and the project settings, and a lot of experiments are done to give out the optimi-zation solution. It plays a guiding role in the implementation of real-time feature in embedded DM642 platform.

  20. The role of transcriptional coactivator ADA2b in Arabidopsis abiotic stress responses.

    Science.gov (United States)

    Vlachonasios, Konstantinos E; Kaldis, Athanasios; Nikoloudi, Adriana; Tsementzi, Despoina

    2011-10-01

    Plant growth and crop production can be greatly affected by common environmental stresses such as drought, high salinity and low temperatures. Gene expression is affected by several abiotic stresses. Stress-inducible genes are regulated by transcription factors and epigenetic mechanisms such as histone modifications. In this Mini-Review, we have explored the role of transcriptional adaptor ADA2b in Arabidopsis responses to abiotic stress. ADA2b is required for the expression of genes involved in abiotic stress either by controlling H3 and H4 acetylation in the case of salt stress or affecting nucleosome occupancy in low temperatures response.

  1. RNA editing of hepatitis B virus transcripts by activation-induced cytidine deaminase.

    Science.gov (United States)

    Liang, Guoxin; Kitamura, Kouichi; Wang, Zhe; Liu, Guangyan; Chowdhury, Sajeda; Fu, Weixin; Koura, Miki; Wakae, Kousho; Honjo, Tasuku; Muramatsu, Masamichi

    2013-02-01

    Activation-induced cytidine deaminase (AID) is essential for the somatic hypermutation (SHM) and class-switch recombination (CSR) of Ig genes. The mechanism by which AID triggers SHM and CSR has been explained by two distinct models. In the DNA deamination model, AID converts cytidine bases in DNA into uridine. The uridine is recognized by the DNA repair system, which produces DNA strand breakages and point mutations. In the alternative model, RNA edited by AID is responsible for triggering CSR and SHM. However, RNA deamination by AID has not been demonstrated. Here we found that C-to-T and G-to-A mutations accumulated in hepatitis B virus (HBV) nucleocapsid DNA when AID was expressed in HBV-replicating hepatic cell lines. AID expression caused C-to-T mutations in the nucleocapsid DNA of RNase H-defective HBV, which does not produce plus-strand viral DNA. Furthermore, the RT-PCR products of nucleocapsid viral RNA from AID-expressing cells exhibited significant C-to-T mutations, whereas viral RNAs outside the nucleocapsid did not accumulate C-to-U mutations. Moreover, AID was packaged within the nucleocapsid by forming a ribonucleoprotein complex with HBV RNA and the HBV polymerase protein. The encapsidation of the AID protein with viral RNA and DNA provides an efficient environment for evaluating AID's RNA and DNA deamination activities. A bona fide RNA-editing enzyme, apolipoprotein B mRNA editing catalytic polypeptide 1, induced a similar level of C-to-U mutations in nucleocapsid RNA as AID. Taken together, the results indicate that AID can deaminate the nucleocapsid RNA of HBV.

  2. Activation-Induced Cytidine Deaminase Contributes to Pancreatic Tumorigenesis by Inducing Tumor-Related Gene Mutations.

    Science.gov (United States)

    Sawai, Yugo; Kodama, Yuzo; Shimizu, Takahiro; Ota, Yuji; Maruno, Takahisa; Eso, Yuji; Kurita, Akira; Shiokawa, Masahiro; Tsuji, Yoshihisa; Uza, Norimitsu; Matsumoto, Yuko; Masui, Toshihiko; Uemoto, Shinji; Marusawa, Hiroyuki; Chiba, Tsutomu

    2015-08-15

    Pancreatic ductal adenocarcinoma (PDAC) develops via an accumulation of various gene mutations. The mechanism underlying the mutations in PDAC development, however, is not fully understood. Recent insight into the close association between the mutation pattern of various cancers and specific mutagens led us to investigate the possible involvement of activation-induced cytidine deaminase (AID), a DNA editing enzyme, in pancreatic tumorigenesis. Our immunohistochemical findings revealed AID protein expression in human acinar ductal metaplasia, pancreatic intraepithelial neoplasia, and PDAC. Both the amount and intensity of the AID protein expression increased with the progression from precancerous to cancerous lesions in human PDAC tissues. To further assess the significance of ectopic epithelial AID expression in pancreatic tumorigenesis, we analyzed the phenotype of AID transgenic (AID Tg) mice. Consistent with our hypothesis that AID is involved in the mechanism of the mutations underlying pancreatic tumorigenesis, we found precancerous lesions developing in the pancreas of AID Tg mice. Using deep sequencing, we also detected Kras and c-Myc mutations in our analysis of the whole pancreas of AID Tg mice. In addition, Sanger sequencing confirmed the presence of Kras, c-Myc, and Smad4 mutations, with the typical mutational footprint of AID in precancerous lesions in AID Tg mice separated by laser capture microdissection. Taken together, our findings suggest that AID contributes to the development of pancreatic precancerous lesions by inducing tumor-related gene mutations. Our new mouse model without intentional manipulation of specific tumor-related genes provides a powerful system for analyzing the mutations involved in PDAC.

  3. Mutation Processes in 293-Based Clones Overexpressing the DNA Cytosine Deaminase APOBEC3B.

    Directory of Open Access Journals (Sweden)

    Monica K Akre

    Full Text Available Molecular, cellular, and clinical studies have combined to demonstrate a contribution from the DNA cytosine deaminase APOBEC3B (A3B to the overall mutation load in breast, head/neck, lung, bladder, cervical, ovarian, and other cancer types. However, the complete landscape of mutations attributable to this enzyme has yet to be determined in a controlled human cell system. We report a conditional and isogenic system for A3B induction, genomic DNA deamination, and mutagenesis. Human 293-derived cells were engineered to express doxycycline-inducible A3B-eGFP or eGFP constructs. Cells were subjected to 10 rounds of A3B-eGFP exposure that each caused 80-90% cell death. Control pools were subjected to parallel rounds of non-toxic eGFP exposure, and dilutions were done each round to mimic A3B-eGFP induced population fluctuations. Targeted sequencing of portions of TP53 and MYC demonstrated greater mutation accumulation in the A3B-eGFP exposed pools. Clones were generated and microarray analyses were used to identify those with the greatest number of SNP alterations for whole genome sequencing. A3B-eGFP exposed clones showed global increases in C-to-T transition mutations, enrichments for cytosine mutations within A3B-preferred trinucleotide motifs, and more copy number aberrations. Surprisingly, both control and A3B-eGFP clones also elicited strong mutator phenotypes characteristic of defective mismatch repair. Despite this additional mutational process, the 293-based system characterized here still yielded a genome-wide view of A3B-catalyzed mutagenesis in human cells and a system for additional studies on the compounded effects of simultaneous mutation mechanisms in cancer cells.

  4. Preliminary investigations on inducing salt tolerance in maize through inoculation with rhizobacteria containing ACC deaminase activity.

    Science.gov (United States)

    Nadeem, Sajid Mahmood; Zahir, Zahir Ahmad; Naveed, Muhammad; Arshad, Muhammad

    2007-10-01

    Twenty rhizobacterial strains containing 1-aminocyclopropane-1-carboxylate deaminase were isolated from the rhizosphere of salt-affected maize fields. They were screened for their growth-promoting activities under axenic conditions at 1, 4, 8, and 12 dS x m-1 salinity levels. Based upon the data of the axenic study, the 6 most effective strains were selected to conduct pot trials in the wire house. Besides one original salinity level (1.6 dS x m-1), 3 other salinity levels (4, 8, and 12 dS x m-1) were maintained in pots and maize seeds inoculated with selected strains of plant growth-promoting rhizobacteria, as well as uninoculated controls were sown. Results showed that the increase in salinity level decreased the growth of maize seedlings. However, inoculation with rhizobacterial strains reduced this depression effect and improved the growth and yield at all the salinity levels tested. Selected strains significantly increased plant height, root length, total biomass, cob mass, and grain yield up to 82%, 93%, 51%, 40%, and 50%, respectively, over respective uninoculated controls at the electrical conductivity of 12 dS x m-1. Among various plant growth-promoting rhizobacterial strains, S5 (Pseudomonas syringae), S14 (Enterobacter aerogenes), and S20 (Pseudomonas fluorescens) were the most effective strains for promoting the growth and yield of maize, even at high salt stress. The relatively better salt tolerance of inoculated plants was associated with a high K+/Na+ ratio as well as high relative water and chlorophyll and low proline contents.

  5. Dual targeting of tumor angiogenesis and chemotherapy by endostatin-cytosine deaminase-uracil phosphoribosyltransferase.

    Science.gov (United States)

    Chen, Chun-Te; Yamaguchi, Hirohito; Lee, Hong-Jen; Du, Yi; Lee, Heng-Huan; Xia, Weiya; Yu, Wen-Hsuan; Hsu, Jennifer L; Yen, Chia-Jui; Sun, Hui-Lung; Wang, Yan; Yeh, Edward T H; Hortobagyi, Gabriel N; Hung, Mien-Chie

    2011-08-01

    Several antiangiogenic drugs targeting VEGF/VEGF receptor (VEGFR) that were approved by the Food and Drug Administration for many cancer types, including colorectal and lung cancer, can effectively reduce tumor growth. However, targeting the VEGF signaling pathway will probably influence the normal function of endothelial cells in maintaining homeostasis and can cause unwanted adverse effects. Indeed, emerging experimental evidence suggests that VEGF-targeting therapy induced less tumor cell-specific cytotoxicity, allowing residual cells to become more resistant and eventually develop a more malignant phenotype. We report an antitumor therapeutic EndoCD fusion protein developed by linking endostatin (Endo) to cytosine deaminase and uracil phosphoribosyltransferase (CD). Specifically, Endo possesses tumor antiangiogenesis activity that targets tumor endothelial cells, followed by CD, which converts the nontoxic prodrug 5-fluorocytosine (5-FC) to the cytotoxic antitumor drug 5-fluorouracil (5-FU) in the local tumor area. Moreover, selective targeting of tumor sites allows an increasing local intratumoral concentration of 5-FU, thus providing high levels of cytotoxic activity. We showed that treatment with EndoCD plus 5-FC, compared with bevacizumab plus 5-FU treatment, significantly increased the 5-FU concentration around tumor sites and suppressed tumor growth and metastasis in human breast and colorectal orthotropic animal models. In addition, in contrast to treatment with bevacizumab/5-FU, EndoCD/5-FC did not induce cardiotoxicity leading to heart failure in mice after long-term treatment. Our results showed that, compared with currently used antiangiogenic drugs, EndoCD possesses potent anticancer activity with virtually no toxic effects and does not increase tumor invasion or metastasis. Together, these findings suggest that EndoCD/5-FC could become an alternative option for future antiangiogenesis therapy.

  6. Mutation of Escherichia coli cytosine deaminase significantly enhances molecular chemotherapy of human glioma.

    Science.gov (United States)

    Kaliberov, S A; Market, J M; Gillespie, G Y; Krendelchtchikova, V; Della Manna, D; Sellers, J C; Kaliberova, L N; Black, M E; Buchsbaum, D J

    2007-07-01

    Combined treatment using adenoviral (Ad)-directed enzyme/prodrug therapy and radiation therapy has the potential to become a powerful method of cancer therapy. We have developed an Ad vector encoding a mutant bacterial cytosine deaminase (bCD) gene (AdbCD-D314A), which has a higher affinity for cytosine than wild-type bCD (bCDwt). The purpose of this study was to evaluate cytotoxicity in vitro and therapeutic efficacy in vivo of the combination of AdbCD-D314A with the prodrug 5-fluorocytosine (5-FC) and ionizing radiation against human glioma. The present study demonstrates that AdbCD-D314A infection resulted in increased 5-FC-mediated cell killing, compared with AdbCDwt. Furthermore, a significant increase in cytotoxicity following AdbCD-D314A and radiation treatment of glioma cells in vitro was demonstrated as compared to AdbCDwt. Animal studies showed significant inhibition of subcutaneous or intracranial tumor growth of D54MG glioma xenografts by the combination of AdbCD-D314A/5-FC with ionizing radiation as compared with either agent alone, and with AdbCDwt/5-FC plus radiation. The results suggest that the combination of AdbCD-D314A/5-FC with radiation produces markedly increased cytotoxic effects in cancer cells in vitro and in vivo. These data indicate that combined treatment with this novel mutant enzyme/prodrug therapy and radiotherapy provides a promising approach for cancer therapy.

  7. A facile synthetic route to diazepinone derivatives via ring closing metathesis and its application for human cytidine deaminase inhibitors.

    Science.gov (United States)

    Kim, Minkyoung; Gajulapati, Kondaji; Kim, Chorong; Jung, Hwa Young; Goo, Jail; Lee, Kyeong; Kaur, Navneet; Kang, Hyo Jin; Chung, Sang J; Choi, Yongseok

    2012-12-04

    A variety of diazepinone derivatives were prepared from α-amino acids and amino alcohols by a new synthetic methodology based on ring closing metathesis as a key step. The diazepinones were coupled with ribose derivatives to afford novel diazepinone nucleosides. Among them, (4R)-1-ribosyl-4-methyl-3,4-dihydro-1H-1,3-diazepin-2(7H)-one (3) showed a potent inhibitory effect (K(i) = 145.97 ± 4.87 nM) against human cytidine deaminase.

  8. Expression of the 1-Aminocyclopropane-1-Carboxylic Acid Deaminase Gene Requires Symbiotic Nitrogen-Fixing Regulator Gene nifA2 in Mesorhizobium loti MAFF303099

    OpenAIRE

    Nukui, Noriyuki; MINAMISAWA, KIWAMU; Ayabe, Shin-Ichi; Aoki, Toshio

    2006-01-01

    Many soil bacteria contain 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase, which degrades ACC, a precursor of the phytohormone ethylene. In order to examine the regulation of the acdS gene encoding ACC deaminase in Mesorhizobium loti MAFF303099 during symbiosis with the host legume Lotus japonicus, we introduced the β-glucuronidase (GUS) gene into acdS so that GUS was expressed under control of the acdS promoter, and we also generated disruption mutants with mutations in a nitrogen fix...

  9. Evidence for an A2/Ra adenosine receptor in the guinea-pig trachea

    Science.gov (United States)

    Brown, C.M.; Collis, M.G.

    1982-01-01

    1 An attempt was made to determine whether the extracellular adenosine receptor that mediates relaxation in the guinea-pig trachea is of the A1/Ri or A2/Ra subtype. 2 Dose-response curves to adenosine and a number of 5′- and N6-substituted analogues were constructed for the isolated guinea-pig trachea, contracted with carbachol. 3 The 5′-substituted analogues of adenosine were the most potent compounds tested, the order of potency being 5′-N-cyclopropylcarboxamide adenosine (NCPCA) > 5′-N-ethylcarboxamide adenosine (NECA) > 2-chloroadenosine > L-N6-phenylisopropyladenosine (L-PIA) > adenosine > D-N6-phenylisopropyladenosine (D-PIA). 4 The difference in potency between the stereoisomers D- and L-PIA on the isolated trachea was at the most five fold. 5 Responses to low doses of adenosine and its analogues were attenuated after treatment with either theophylline or 8-phenyltheophylline. The responses to 2-chloroadenosine were affected to a lesser extent than were those to the other purines. 6 Adenosine transport inhibitors, dipyridamole and dilazep, potentiated responses to adenosine, did not affect those to NCPCA, NECA, L-PIA and D-PIA but significantly reduced the responses to high doses of 2-chloroadenosine. 7 Relaxations evoked by 9-β-D-xylofuranosyladenosine which can activate intracellular but not extracellular adenosine receptors, were attenuated by dipyridamole but unaffected by 8-phenyltheophylline. 8 The results support the existence of an extracellular A2/Ra subtype of adenosine receptor and an intracellular purine-sensitive site, both of which mediate relaxation. PMID:6286021

  10. Effect of phentolamine on the hyperemic response to adenosine in patients with microvascular disease.

    Science.gov (United States)

    Aarnoudse, Wilbert; Geven, Maartje; Barbato, Emanuele; Botman, Kees-joost; De Bruyne, Bernard; Pijls, Nico H J

    2005-12-15

    For accurate measurement of the fractional flow reserve (FFR) of the myocardium, the presence of maximum hyperemia is of paramount importance. It has been suggested that the hyperemic effect of the conventionally used hyperemic stimulus, adenosine, could be submaximal in patients who have microvascular dysfunction and that adding alpha-blocking agents could augment the hyperemic response in these patients. We studied the effect of the nonselective alpha-blocking agent phentolamine, which was administered in addition to adenosine after achieving hyperemia, in patients who had microvascular disease and those who did not. Thirty patients who were referred for percutaneous coronary intervention were selected. Of these 30 patients, 15 had strong indications for microvascular disease and 15 did not. FFR was measured using intracoronary adenosine, intravenous adenosine, and intracoronary papaverine before and after intracoronary administration of the nonselective alpha blocker phentolamine. In patients who did not have microvascular disease, no differences in hyperemic response to adenosine were noted, whether or not alpha blockade was given before adenosine administration; FFR levels before and after phentolamine were 0.76 and 0.75, respectively, using intracoronary adenosine (p = 0.10) and 0.75 and 0.74, respectively, using intravenous adenosine (p = 0.20). In contrast, in patients who had microvascular disease, some increase in hyperemic response was observed after administration of phentolamine; FFR levels decreased from 0.74 to 0.70 using intracoronary adenosine (p = 0.003) and from 0.75 to 0.72 using intravenous adenosine (p = 0.04). Although statistically significant, the observed further decrease in microvascular resistance after addition of phentolamine was small and did not affect clinical decision making in any patient. In conclusion, when measuring FFR, routinely adding an alpha-blocking agent to adenosine does not affect clinical decision making.

  11. Characterization of spontaneous, transient adenosine release in the caudate-putamen and prefrontal cortex.

    Science.gov (United States)

    Nguyen, Michael D; Lee, Scott T; Ross, Ashley E; Ryals, Matthew; Choudhry, Vishesh I; Venton, B Jill

    2014-01-01

    Adenosine is a neuroprotective agent that inhibits neuronal activity and modulates neurotransmission. Previous research has shown adenosine gradually accumulates during pathologies such as stroke and regulates neurotransmission on the minute-to-hour time scale. Our lab developed a method using carbon-fiber microelectrodes to directly measure adenosine changes on a sub-second time scale with fast-scan cyclic voltammetry (FSCV). Recently, adenosine release lasting a couple of seconds has been found in murine spinal cord slices. In this study, we characterized spontaneous, transient adenosine release in vivo, in the caudate-putamen and prefrontal cortex of anesthetized rats. The average concentration of adenosine release was 0.17±0.01 µM in the caudate and 0.19±0.01 µM in the prefrontal cortex, although the range was large, from 0.04 to 3.2 µM. The average duration of spontaneous adenosine release was 2.9±0.1 seconds and 2.8±0.1 seconds in the caudate and prefrontal cortex, respectively. The concentration and number of transients detected do not change over a four hour period, suggesting spontaneous events are not caused by electrode implantation. The frequency of adenosine transients was higher in the prefrontal cortex than the caudate-putamen and was modulated by A1 receptors. The A1 antagonist DPCPX (8-cyclopentyl-1,3-dipropylxanthine, 6 mg/kg i.p.) increased the frequency of spontaneous adenosine release, while the A1 agonist CPA (N(6)-cyclopentyladenosine, 1 mg/kg i.p.) decreased the frequency. These findings are a paradigm shift for understanding the time course of adenosine signaling, demonstrating that there is a rapid mode of adenosine signaling that could cause transient, local neuromodulation.

  12. Adenosine Inhibits the Excitatory Synaptic Inputs to Basal Forebrain Cholinergic, GABAergic and Parvalbumin Neurons in mice

    Directory of Open Access Journals (Sweden)

    Chun eYang

    2013-06-01

    Full Text Available Coffee and tea contain the stimulants caffeine and theophylline. These compounds act as antagonists of adenosine receptors. Adenosine promotes sleep and its extracellular concentration rises in association with prolonged wakefulness, particularly in the basal forebrain (BF region involved in activating the cerebral cortex. However, the effect of adenosine on identified BF neurons, especially non-cholinergic neurons, is incompletely understood. Here we used whole-cell patch-clamp recordings in mouse brain slices prepared from two validated transgenic mouse lines with fluorescent proteins expressed in GABAergic or parvalbumin (PV neurons to determine the effect of adenosine. Whole-cell recordings were made BF cholinergic neurons and from BF GABAergic & PV neurons with the size (>20 µm and intrinsic membrane properties (prominent H-currents corresponding to cortically projecting neurons. A brief (2 min bath application of adenosine (100 μM decreased the frequency but not the amplitude of spontaneous excitatory postsynaptic currents in all groups of BF cholinergic, GABAergic and PV neurons we recorded. In addition, adenosine decreased the frequency of miniature EPSCs in BF cholinergic neurons. Adenosine had no effect on the frequency of spontaneous inhibitory postsynaptic currents in cholinergic neurons or GABAergic neurons with large H-currents but reduced them in a group of GABAergic neurons with smaller H-currents. All effects of adenosine were blocked by a selective, adenosine A1 receptor antagonist, cyclopentyltheophylline (CPT, 1 μM. Adenosine had no postsynaptic effects. Taken together, our work suggests that adenosine promotes sleep by an A1-receptor mediated inhibition of glutamatergic inputs to cortically-projecting cholinergic and GABA/PV neurons. Conversely, caffeine and theophylline promote attentive wakefulness by inhibiting these A1 receptors in BF thereby promoting the high-frequency oscillations in the cortex required for

  13. Adenosine conjugated lipidic nanoparticles for enhanced tumor targeting.

    Science.gov (United States)

    Swami, Rajan; Singh, Indu; Jeengar, Manish Kumar; Naidu, V G M; Khan, Wahid; Sistla, Ramakrishna

    2015-01-01

    Delivering chemotherapeutics by nanoparticles into tumor is impeded majorly by two factors: nonspecific targeting and inefficient penetration. Targeted delivery of anti-cancer agents solely to tumor cells introduces a smart strategy because it enhances the therapeutic index compared with untargeted drugs. The present study was performed to investigate the efficiency of adenosine (ADN) to target solid lipid nanoparticles (SLN) to over expressing adenosine receptor cell lines such as human breast cancer and prostate cancer (MCF-7 and DU-145 cells), respectively. SLN were prepared by emulsification and solvent evaporation process using docetaxel (DTX) as drug and were characterized by various techniques like dynamic light scattering, differential scanning calorimeter and transmission electron microscopy. DTX loaded SLNs were surface modified with ADN, an adenosine receptors ligand using carbodiimide coupling. Conjugation was confirmed using infrared spectroscopy and quantified using phenol-sulfuric acid method. Conjugated SLN were shown to have sustained drug release as compared to unconjugated nanoparticles and drug suspension. Compared with free DTX and unconjugated SLN, ADN conjugated SLN showed significantly higher cytotoxicity of loaded DTX, as evidenced by in vitro cell experiments. The IC50 was 0.41 μg/ml for native DTX, 0.30 μg/ml for unconjugated SLN formulation, and 0.09 μg/ml for ADN conjugated SLN formulation in MCF-7 cell lines. Whereas, in DU-145, there was 2 fold change in IC50 of ADN-SLN as compared to DTX. IC50 was found to be 0.44 μg/ml for free DTX, 0.39 μg/ml for unconjugated SLN and 0.22 μg/ml for ADN-SLN. Annexin assay and cell cycle analysis assay further substantiated the cell cytotoxicity. Fluorescent cell uptake and competitive ligand-receptor binding assay corroborated the receptor mediated endocytosis pathway indicated role of adenosine receptors in internalization of conjugated particles. Pharmacokinetic studies of lipidic

  14. Adenosine triphosphate (ATP) as a possible indicator of extraterrestrial biology

    Science.gov (United States)

    Chappelle, E. W.; Picciolo, G. L.

    1974-01-01

    The ubiquity of adenosine triphosphate (ATP) in terrestrial organisms provides the basis for proposing the assay of this vital metabolic intermediate for detecting extraterrestrial biological activity. If an organic carbon chemistry is present on the planets, the occurrence of ATP is possible either from biosynthetic or purely chemical reactions. However, ATP's relative complexity minimizes the probability of abiogenic synthesis. A sensitive technique for the quantitative detection of ATP was developed using the firefly bioluminescent reaction. The procedure was used successfully for the determination of the ATP content of soil and bacteria. This technique is also being investigated from the standpoint of its application in clinical medicine.

  15. Ribosome-inactivating lectins with polynucleotide:adenosine glycosidase activity.

    Science.gov (United States)

    Battelli, M G; Barbieri, L; Bolognesi, A; Buonamici, L; Valbonesi, P; Polito, L; Van Damme, E J; Peumans, W J; Stirpe, F

    1997-05-26

    Lectins from Aegopodium podagraria (APA), Bryonia dioica (BDA), Galanthus nivalis (GNA), Iris hybrid (IRA) and Sambucus nigra (SNAI), and a new lectin-related protein from Sambucus nigra (SNLRP) were studied to ascertain whether they had the properties of ribosome-inactivating proteins (RIP). IRA and SNLRP inhibited protein synthesis by a cell-free system and, at much higher concentrations, by cells and had polynucleotide:adenosine glycosidase activity, thus behaving like non-toxic type 2 (two chain) RIP. APA and SNAI had much less activity, and BDA and GNA did not inhibit protein synthesis.

  16. A Plan for Collecting Ada Software Development Cost, Schedule, and Environment Data.

    Science.gov (United States)

    1987-04-02

    person-weeks is the minimum training time. This time includes teaching a methodology adapted to Ada and 50 percent hands-on experiments under the...level." He felt translation of existing programs was an excellent way to bring pro- grammers up to speed. The more mathematical functions in the program

  17. OSHA and ADA: "Reasonable Accommodation" in Training Persons with Developmental Disabilities.

    Science.gov (United States)

    Sandoz, Charles J.

    This paper documents an approach to meeting the training requirements of the Occupational Safety and Health Act (OSHA) and the "reasonable accommodation" requirements of the Americans with Disabilities Act (ADA) for individuals with developmental disabilities. It describes a training program used with three adult workers with mild mental…

  18. 61 FR 11863 - Vehicle Management Area Designation and Road Closure Order; Ada, Elmore, Canyon, and Owyhee...

    Science.gov (United States)

    1996-03-22

    ... Vehicle Management Area Designation and Road Closure Order; Ada, Elmore, Canyon, and Owyhee Counties, ID... except for those portions of the NCA currently included within the Owyhee Front Special Recreation... Bruneau, Kuna, and Owyhee Management Framework Plans, and the Jarbidge Resource Management Plan....

  19. 61 FR 11862 - Shooting Closures and Restrictions in Ada, Canyon, Elmore, and Owyhee Counties, ID

    Science.gov (United States)

    1996-03-22

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF THE INTERIOR Shooting Closures and Restrictions in Ada, Canyon, Elmore, and Owyhee Counties, ID AGENCY: Bureau of Land... Bruneau, Kuna, and Owyhee Management Framework Plans. Violation of this order is punishable by a fine...

  20. Anemia nos pacientes com insuficiência cardíaca avançada

    Directory of Open Access Journals (Sweden)

    Juliano Cardoso

    2010-10-01

    Full Text Available FUNDAMENTO: Anemia está associada à pior evolução nos pacientes com insuficiência cardíaca (IC. Entretanto, há poucos estudos sobre a anemia nos pacientes com IC avançada. OBJETIVO: Avaliar as características da anemia na IC em fase avançada. MÉTODOS: Foram incluídos 99 pacientes hospitalizados para compensação de IC (CF IV/NYHA, com idade > 18 anos e FEVE 12 g/dl. A anemia foi marcador independente de mau prognóstico na análise multivariada (mortalidade 47% vs 24,6%, p = 0,016, risco relativo 2,54. CONCLUSÃO: Anemia acomete, aproximadamente, 1/3 dos pacientes com IC avançada, e a deficiência de ferro é uma importante etiologia. Pacientes anêmicos são mais idosos e apresentaram função renal mais deteriorada. A melhora da congestão não foi suficiente para melhorar a anemia na maioria dos casos. Nos pacientes com IC avançada, a anemia é marcador independente de mau prognóstico.

  1. Automatic player detection and recognition in images using AdaBoost

    NARCIS (Netherlands)

    Mahmood, Zahid; Ali, Tauseef; Khattak, Shadid

    2012-01-01

    In this work we developed an augmented reality sports broadcasting application for enhanced end-user experience. The proposed system consists of three major steps. In the first step each player is detected using AdaBoost Algorithm. In second step, same algorithm is used to detect face in each player

  2. CREASE 6.0 Catalog of Resources for Education in Ada and Software Engineering

    Science.gov (United States)

    1992-02-01

    Addison-Wesley, 1989. Gonzaler , D.W. Ada Programming Handbook. Compiler(s): DEC Compiler Conpumr(s): Vax-under VMS ScIedu/e The class meets twice a...Successfully completed another high-order programming course Credit Hours: 3 Point of Contact: Sergio An toy, Dept. of Computer Science, Portland State

  3. Infrastructure Measures versus ADAS for Traffic Safety - Application of the Grey Relational Analysis Evaluation Method

    NARCIS (Netherlands)

    Lu, M.; Wevers, K.; Heijden, R.E.C.M. van der; Marchau, V.A.W.J.

    2005-01-01

    Two of the main approaches to improve traffic safety are extensive redesign of the physical road infrastructure and large-scale implementation of Advanced Driver Assistance Systems (ADAS). These strategies are to a large extent substitutes, but also partly complementary. This paper determines strate

  4. Treatment of paroxysmal supraventricular tachycardia with intravenous injection of adenosine triphosphate.

    OpenAIRE

    Saito, D.; Ueeda, M; Abe, Y.; Tani, H; Nakatsu, T.; Yoshida, H.; Haraoka, S; Nagashima, H

    1986-01-01

    Intravenous adenosine triphosphate rapidly terminated all 11 episodes of paroxysmal supraventricular tachycardia in 10 patients. Eight patients reported side effects but these resolved within 20 seconds and did not require treatment. Adenosine triphosphate is a suitable agent for the rapid termination of paroxysmal supraventricular tachycardia.

  5. The ischemic preconditioning effect of adenosine in patients with ischemic heart disease

    Directory of Open Access Journals (Sweden)

    Berglund Margareta

    2009-11-01

    Full Text Available Abstract Introduction In vivo and in vitro evidence suggests that adenosine and its agonists play key roles in the process of ischemic preconditioning. The effects of low-dose adenosine infusion on ischemic preconditioning have not been thoroughly studied in humans. Aims We hypothesised that a low-dose adenosine infusion could reduce the ischemic burden evoked by physical exercise and improve the regional left ventricular (LV systolic function. Materials and methods We studied nine severely symptomatic male patients with severe coronary artery disease. Myocardial ischemia was induced by exercise on two separate occasions and quantified by Tissue Doppler Echocardiography. Prior to the exercise test, intravenous low-dose adenosine or placebo was infused over ten minutes according to a randomized, double blind, cross-over protocol. The LV walls were defined as ischemic if a reduction, no increment, or an increment of Results PSV increased from baseline to maximal exercise in non-ischemic walls both during placebo (P = 0.0001 and low-dose adenosine infusion (P = 0.0009. However, in the ischemic walls, PSV increased only during low-dose adenosine infusion (P = 0.001, while no changes in PSV occurred during placebo infusion (P = NS. Conclusion Low-dose adenosine infusion reduced the ischemic burden and improved LV regional systolic function in the ischemic walls of patients with exercise-induced myocardial ischemia, confirming that adenosine is a potential preconditioning agent in humans.

  6. Genetically Controlled Upregulation of Adenosine A(1) Receptor Expression Enhances the Survival of Primary Cortical Neurons

    NARCIS (Netherlands)

    Serchov, Tsvetan; Atas, Hasan-Cem; Normann, Claus; van Calker, Dietrich; Biber, Knut

    2012-01-01

    Adenosine has a key endogenous neuroprotective role in the brain, predominantly mediated by the adenosine A(1) receptor (A(1)R). This has been mainly explored using pharmacological tools and/or receptor knockout mice strains. It has long been suggested that the neuroprotective effects of A(1)R are i

  7. Nafion-CNT coated carbon-fiber microelectrodes for enhanced detection of adenosine.

    Science.gov (United States)

    Ross, Ashley E; Venton, B Jill

    2012-07-07

    Adenosine is a neuromodulator that regulates neurotransmission. Adenosine can be monitored using fast-scan cyclic voltammetry at carbon-fiber microelectrodes and ATP is a possible interferent in vivo because the electroactive moiety, adenine, is the same for both molecules. In this study, we investigated carbon-fiber microelectrodes coated with Nafion and carbon nanotubes (CNTs) to enhance the sensitivity of adenosine and decrease interference by ATP. Electrodes coated in 0.05 mg mL(-1) CNTs in Nafion had a 4.2 ± 0.2 fold increase in current for adenosine, twice as large as for Nafion alone. Nafion-CNT electrodes were 6 times more sensitive to adenosine than ATP. The Nafion-CNT coating did not slow the temporal response of the electrode. Comparing different purine bases shows that the presence of an amine group enhances sensitivity and that purines with carbonyl groups, such as guanine and hypoxanthine, do not have as great an enhancement after Nafion-CNT coating. The ribose group provides additional sensitivity enhancement for adenosine over adenine. The Nafion-CNT modified electrodes exhibited significantly more current for adenosine than ATP in brain slices. Therefore, Nafion-CNT modified electrodes are useful for sensitive, selective detection of adenosine in biological samples.

  8. The effect of circulating adenosine on cerebral haemodynamics and headache generation in healthy subjects

    DEFF Research Database (Denmark)

    Birk, S; Petersen, K.A.; Kruuse, Christina Rostrup

    2005-01-01

    been investigated in man and reports regarding the effect of intravenous adenosine on cerebral blood flow are conflicting. Twelve healthy participants received adenosine 80, 120 microg kg(-1) min(-1) and placebo intravenously for 20 min, in a double-blind, three-way, crossover, randomized design...

  9. Different Modulating Effects of Adenosine on Neonatal and Adult Polymorphonuclear Leukocytes

    Directory of Open Access Journals (Sweden)

    Pei-Chen Hou

    2012-01-01

    Full Text Available Polymorphonuclear leukocytes (PMNs are the major leukocytes in the circulation and play an important role in host defense. Intact PMN functions include adhesion, migration, phagocytosis, and reactive oxygen species (ROS release. It has been known for a long time that adenosine can function as a modulator of adult PMN functions. Neonatal plasma has a higher adenosine level than that of adults; however, little is known about the modulating effects of adenosine on neonatal PMNs. The aim of this study was to investigate the effects of adenosine on neonatal PMN functions. We found that neonatal PMNs had impaired adhesion, chemotaxis, and ROS production abilities, but not phagocytosis compared to adult PMNs. As with adult PMNs, adenosine could suppress the CD11b expressions of neonatal PMNs, but had no significant suppressive effect on phagocytosis. In contrast to adult PMNs, adenosine did not significantly suppress chemotaxis and ROS production of neonatal PMNs. This may be due to impaired phagocyte reactions and a poor neonatal PMN response to adenosine. Adenosine may not be a good strategy for the treatment of neonatal sepsis because of impaired phagocyte reactions and poor response.

  10. First-In-Class Small Molecule Inhibitors of the Single-Strand DNA Cytosine Deaminase APOBEC3G

    Energy Technology Data Exchange (ETDEWEB)

    Li, Ming; Shandilya, Shivender M.D.; Carpenter, Michael A.; Rathore, Anurag; Brown, William L.; Perkins, Angela L.; Harki, Daniel A.; Solberg, Jonathan; Hook, Derek J.; Pandey, Krishan K.; Parniak, Michael A.; Johnson, Jeffrey R.; Krogan, Nevan J.; Somasundaran, Mohan; Ali, Akbar; Schiffer, Celia A.; Harris, Reuben S. (Pitt); (UMASS, MED); (SLUHSC); (UCSF); (UMM)

    2012-04-04

    APOBEC3G is a single-stranded DNA cytosine deaminase that comprises part of the innate immune response to viruses and transposons. Although APOBEC3G is the prototype for understanding the larger mammalian polynucleotide deaminase family, no specific chemical inhibitors exist to modulate its activity. High-throughput screening identified 34 compounds that inhibit APOBEC3G catalytic activity. Twenty of 34 small molecules contained catechol moieties, which are known to be sulfhydryl reactive following oxidation to the orthoquinone. Located proximal to the active site, C321 was identified as the binding site for the inhibitors by a combination of mutational screening, structural analysis, and mass spectrometry. Bulkier substitutions C321-to-L, F, Y, or W mimicked chemical inhibition. A strong specificity for APOBEC3G was evident, as most compounds failed to inhibit the related APOBEC3A enzyme or the unrelated enzymes E. coli uracil DNA glycosylase, HIV-1 RNase H, or HIV-1 integrase. Partial, but not complete, sensitivity could be conferred to APOBEC3A by introducing the entire C321 loop from APOBEC3G. Thus, a structural model is presented in which the mechanism of inhibition is both specific and competitive, by binding a pocket adjacent to the APOBEC3G active site, reacting with C321, and blocking access to substrate DNA cytosines.

  11. APOBEC3G is a single-stranded DNA cytidine deaminase and functions independently of HIV reverse transcriptase

    Science.gov (United States)

    Suspène, Rodolphe; Sommer, Peter; Henry, Michel; Ferris, Stéphane; Guétard, Denise; Pochet, Sylvie; Chester, Ann; Navaratnam, Naveenan; Wain-Hobson, Simon; Vartanian, Jean-Pierre

    2004-01-01

    In the absence of the viral vif gene, human immunodeficiency virus (HIV) may be restricted by the APOBEC3G gene on chromosome 22. The role of the HIV Vif protein is to exclude host cell APOBEC3G from the budding virion. As APOBEC3G shows sequence homology to cytidine deaminases, it is presumed that in the absence of Vif, cytidine residues in the cDNA are deaminated yielding uracil. It is not known if additional proteins mediate APOBEC3G function or if deamination occurs in concert with reverse transcription. This report describes an in vitro assay showing that Baculovirus derived APOBEC3G alone extensively deaminates cDNA independently of reverse transcriptase. It reproduces the dinucleotide context typical of G → A hypermutants derived from a Δvif virus. By using an RNaseH– form of reverse transcriptase, it was shown that the cDNA has to be free of its RNA template to allow deamination. APOBEC3G deamination of dC or dCTP was not detected. In short, APOBEC3G is a single-stranded DNA cytidine deaminase capable of restricting retroviral replication. PMID:15121899

  12. Killing effect of adenoviral mediated cytosine deaminase gene on human pancreatic cancer cell line PaTu 8988

    Institute of Scientific and Technical Information of China (English)

    PAN Xue; LI Zhao-shen; XU Guo-ming; CUI Long; ZHANG Su-zhen; GONG Yan-fang; TU Zhen-xing

    2001-01-01

    Objective: To evaluate the in vitro killing effects of cytosine deaminase gene mediated by adenovirus vector on human pancreatic carcinoma. Methods: Cytosine Deaminase (CD) gene was cloned into pAdTrack-CMV-CD, pAdTrack-CMV-CD and pAdEasy-1 were recombined in bacteria, and the products containing green fluorescent protein (GFP)were propagated in 293 cells and purified by cesium chloride gradient centrifugation. Human pancreatic carcinoma cell line 8988 were infected with this virus, then 5-FC was added; XTT assay was used to estimate the relative numbers of viable cells. Results: The positive clones were confirmed by using endonuclease digestion, and the titer of the virus containing CD gene was 2 × 1011 pfu/ml. It was found that 5-FC possessed significant cytotoxic activities for CD gene transfected 8988cell line, but had little effects on non-transfected pancreatic carcinoma cells. Conclusion: CD gene mediated by adenovirus has a high infectivity and is efficient for killing cultured pancreatic carcinoma cells, indicating suicide gene may be effective for pancreatic cancer in furure.

  13. Selection of efficient salt-tolerant bacteria containing ACC deaminase for promotion of tomato growth under salinity stress

    Directory of Open Access Journals (Sweden)

    Kannika Chookietwattana* and Kedsukon Maneewan

    2012-05-01

    Full Text Available For successful application of plant growth promoting bacteria (PGPB in salt-affected soil, bioinoculant with salt-tolerant property is required in order to provide better survival and perform well in the field. The present study aimed to select the most efficient salt-tolerant bacterium containing 1-aminocyclopropane-1-carboxylic acid (ACC deaminase from eighty four bacterial strains and to investigate the effects of the selected bacterium on the germination and growth of tomato (Licopersicon esculentum Mill. cv. Seeda under saline conditions. The Bacillus licheniformis B2r was selected for its ability to utilize ACC as a sole nitrogen source under salinity stress. It also showed a high ACC deaminase activity at 0.6 M NaCl salinity. Tomato plants inoculated with the selected bacterium under various saline conditions (0, 30, 60, 90 and 120 mM NaCl revealed a significant increase in the germination percentage, germination index, root length, and seedling dry weight especially at salinity levels ranging from 30-90 mM NaCl. The work described in this report is an important step in developing an efficient salt-tolerant bioinoculant to facilitate plant growth in saline soil.

  14. A novel activation-induced cytidine deaminase (AID) mutation in Brazilian patients with hyper-IgM type 2 syndrome.

    Science.gov (United States)

    Caratão, Nadine; Cortesão, Catarina S; Reis, Pedro H; Freitas, Raquel F; Jacob, Cristina M A; Pastorino, Antonio C; Carneiro-Sampaio, Magda; Barreto, Vasco M

    2013-08-01

    Activation-induced cytidine deaminase (AID) is a DNA editing protein that plays an essential role in three major events of immunoglobulin (Ig) diversification: somatic hypermutation, class switch recombination and Ig gene conversion. Mutations in the AID gene (AICDA) have been found in patients with autosomal recessive Hyper-IgM (HIGM) syndrome type 2. Here, two 9- and 14-year-old Brazilian sisters, from a consanguineous family, were diagnosed with HIGM2 syndrome. Sequencing analysis of the exons from AICDA revealed that both patients are homozygous for a single C to G transversion in the third position of codon 15, which replaces a conserved Phenylalanine with a Leucine. To our knowledge, this is a new AICDA mutation found in HIGM2 patients. Functional studies confirm that the homologous murine mutation leads to a dysfunctional protein with diminished intrinsic cytidine deaminase activity and is unable to rescue CSR when introduced in Aicda(-/-)stimulated murine B cells. We briefly discuss the relevance of AICDA mutations found in patients for the biology of this molecule.

  15. Adenosine signaling and the energetic costs of induced immunity.

    Directory of Open Access Journals (Sweden)

    Brian P Lazzaro

    2015-04-01

    Full Text Available Life history theory predicts that trait evolution should be constrained by competing physiological demands on an organism. Immune defense provides a classic example in which immune responses are presumed to be costly and therefore come at the expense of other traits related to fitness. One strategy for mitigating the costs of expensive traits is to render them inducible, such that the cost is paid only when the trait is utilized. In the current issue of PLOS Biology, Bajgar and colleagues elegantly demonstrate the energetic and life history cost of the immune response that Drosophila melanogaster larvae induce after infection by the parasitoid wasp Leptopilina boulardi. These authors show that infection-induced proliferation of defensive blood cells commands a diversion of dietary carbon away from somatic growth and development, with simple sugars instead being shunted to the hematopoetic organ for rapid conversion into the raw energy required for cell proliferation. This metabolic shift results in a 15% delay in the development of the infected larva and is mediated by adenosine signaling between the hematopoietic organ and the central metabolic control organ of the host fly. The adenosine signal thus allows D. melanogaster to rapidly marshal the energy needed for effective defense and to pay the cost of immunity only when infected.

  16. Methylthioadenosine reprograms macrophage activation through adenosine receptor stimulation.

    Directory of Open Access Journals (Sweden)

    Peter A Keyel

    Full Text Available Regulation of inflammation is necessary to balance sufficient pathogen clearance with excessive tissue damage. Central to regulating inflammation is the switch from a pro-inflammatory pathway to an anti-inflammatory pathway. Macrophages are well-positioned to initiate this switch, and as such are the target of multiple therapeutics. One such potential therapeutic is methylthioadenosine (MTA, which inhibits TNFα production following LPS stimulation. We found that MTA could block TNFα production by multiple TLR ligands. Further, it prevented surface expression of CD69 and CD86 and reduced NF-KB signaling. We then determined that the mechanism of this action by MTA is signaling through adenosine A2 receptors. A2 receptors and TLR receptors synergized to promote an anti-inflammatory phenotype, as MTA enhanced LPS tolerance. In contrast, IL-1β production and processing was not affected by MTA exposure. Taken together, these data demonstrate that MTA reprograms TLR activation pathways via adenosine receptors to promote resolution of inflammation.

  17. Novel trypanocidal analogs of 5'-(methylthio)-adenosine.

    Science.gov (United States)

    Sufrin, Janice R; Spiess, Arthur J; Marasco, Canio J; Rattendi, Donna; Bacchi, Cyrus J

    2008-01-01

    The purine nucleoside 5'-deoxy-5'-(hydroxyethylthio)-adenosine (HETA) is an analog of the polyamine pathway metabolite 5'-deoxy-5'-(methylthio)-adenosine (MTA). HETA is a lead structure for the ongoing development of selectively targeted trypanocidal agents. Thirteen novel HETA analogs were synthesized and examined for their in vitro trypanocidal activities against bloodstream forms of Trypanosoma brucei brucei LAB 110 EATRO and at least one drug-resistant Trypanosoma brucei rhodesiense clinical isolate. New compounds were also assessed in a cell-free assay for their activities as substrates of trypanosome MTA phosphorylase. The most potent analog in this group was 5'-deoxy-5'-(hydroxyethylthio)-tubercidin, whose in vitro cytotoxicity (50% inhibitory concentration [IC50], 10 nM) is 45 times greater than that of HETA (IC50, 450 nM) against pentamidine-resistant clinical isolate KETRI 269. Structure-activity analyses indicate that the enzymatic cleavage of HETA analogs by trypanosome MTA phosphorylase is not an absolute requirement for trypanocidal activity. This suggests that additional biochemical mechanisms are associated with the trypanocidal effects of HETA and its analogs.

  18. Adenosine Amine Congener as a Cochlear Rescue Agent

    Directory of Open Access Journals (Sweden)

    Srdjan M. Vlajkovic

    2014-01-01

    Full Text Available We have previously shown that adenosine amine congener (ADAC, a selective A1 adenosine receptor agonist, can ameliorate noise- and cisplatin-induced cochlear injury. Here we demonstrate the dose-dependent rescue effects of ADAC on noise-induced cochlear injury in a rat model and establish the time window for treatment. Methods. ADAC (25–300 μg/kg was administered intraperitoneally to Wistar rats (8–10 weeks old at intervals (6–72 hours after exposure to traumatic noise (8–16 kHz, 110 dB sound pressure level, 2 hours. Hearing sensitivity was assessed using auditory brainstem responses (ABR before and 12 days after noise exposure. Pharmacokinetic studies investigated ADAC concentrations in plasma after systemic (intravenous administration. Results. ADAC was most effective in the first 24 hours after noise exposure at doses >50 μg/kg, providing up to 21 dB protection (averaged across 8–28 kHz. Pharmacokinetic studies demonstrated a short (5 min half-life of ADAC in plasma after intravenous administration without detection of degradation products. Conclusion. Our data show that ADAC mitigates noise-induced hearing loss in a dose- and time-dependent manner, but further studies are required to establish its translation as a clinical otological treatment.

  19. Reconstruction of the adenosine system by bone marrow-derived mesenchymal stem cell transplantation

    Institute of Scientific and Technical Information of China (English)

    Huicong Kang; Qi Hu; Xiaoyan Liu; Yinhe Liu; Feng Xu; Xiang Li; Suiqiang Zhu

    2012-01-01

    In the present study, we transplanted bone marrow-derived mesenchymal stem cells into the CA3 area of the hippocampus of chronic epilepsy rats kindled by lithium chloride-pilocarpine. Immunofluorescence and western blotting revealed an increase in adenosine A1 receptor expression and a decrease in adenosine A2a receptor expression in the brain tissues of epileptic rats 3 months after transplantation. Moreover, the imbalance in the A1 adenosine receptor/A2a adenosine receptor ratio was improved. Electroencephalograms showed that frequency and amplitude of spikes in the hippocampus and frontal lobe were reduced. These results suggested that mesenchymal stem cell transplantation can reconstruct the normal function of the adenosine system in the brain and greatly improve epileptiform discharges.

  20. Adenosine activates brown adipose tissue and recruits beige adipocytes via A2A receptors

    DEFF Research Database (Denmark)

    Gnad, Thorsten; Scheibler, Saskia; von Kügelgen, Ivar

    2014-01-01

    hamster or rat. However, the role of adenosine in human BAT is unknown. Here we show that adenosine activates human and murine brown adipocytes at low nanomolar concentrations. Adenosine is released in BAT during stimulation of sympathetic nerves as well as from brown adipocytes. The adenosine A2A...... of A2A receptors or injection of lentiviral vectors expressing the A2A receptor into white fat induces brown-like cells-so-called beige adipocytes. Importantly, mice fed a high-fat diet and treated with an A2A agonist are leaner with improved glucose tolerance. Taken together, our results demonstrate...... that adenosine-A2A signalling plays an unexpected physiological role in sympathetic BAT activation and protects mice from diet-induced obesity. Those findings reveal new possibilities for developing novel obesity therapies....

  1. Comparison of exogenous adenosine and voluntary exercise on human skeletal muscle perfusion and perfusion heterogeneity

    DEFF Research Database (Denmark)

    Heinonen, Ilkka H.A.; Kemppainen, Jukka; Kaskinoro, Kimmo;

    2010-01-01

    femoral artery infusion of adenosine (1 mg * min(-1) * litre thigh volume(-1)), which has previously been shown to induce maximal whole thigh blood flow of ~8 L/min. This response was compared to the blood flow induced by moderate-high intensity one-leg dynamic knee extension exercise. Adenosine increased...... muscle. Additionally, it remains to be determined what proportion of adenosine-induced flow elevation is specifically directed to muscle only. In the present study we measured thigh muscle capillary nutritive blood flow in nine healthy young men using positron emission tomography at rest and during...... muscle blood flow on average to 40 +/- 7 ml. min(-1) per 100g(-1) of muscle and an aggregate value of 2.3 +/- 0.6 L * min(-1) for the whole thigh musculature. Adenosine also induced a substantial change in blood flow distribution within individuals. Muscle blood flow during adenosine infusion...

  2. Interstitial and plasma adenosine stimulate nitric oxide and prostacyclin formation in human skeletal muscle

    DEFF Research Database (Denmark)

    Nyberg, Michael Permin; Mortensen, Stefan Peter; Thaning, Pia;

    2010-01-01

    One major unresolved issue in muscle blood flow regulation is that of the role of circulating versus interstitial vasodilatory compounds. The present study determined adenosine-induced formation of NO and prostacyclin in the human muscle interstitium versus in femoral venous plasma to elucidate....... In young healthy humans, microdialysate was collected at rest, during arterial infusion of adenosine, and during interstitial infusion of adenosine through microdialysis probes inserted into musculus vastus lateralis. Muscle interstitial NO and prostacyclin increased with arterial and interstitial infusion...... levels. These findings provide novel insight into the role of adenosine in skeletal muscle blood flow regulation and vascular function by revealing that both interstitial and plasma adenosine have a stimulatory effect on NO and prostacyclin formation. In addition, both skeletal muscle and microvascular...

  3. 2-(1-Hexyn-1-yl)adenosine-induced intraocular hypertension is mediated via K+ channel opening through adenosine A2A receptor in rabbits.

    Science.gov (United States)

    Konno, Takashi; Uchibori, Takehiro; Nagai, Akihiko; Kogi, Kentaro; Nakahata, Norimichi

    2005-08-22

    The present study was performed to clarify the mechanism of change in intraocular pressure by 2-(1-hexyn-1-yl)adenosine (2-H-Ado), a selective adenosine A2 receptor agonist, in rabbits. 2-H-Ado (0.1%, 50 microl)-induced ocular hypertension (E(max): 7.7 mm Hg) was inhibited by an adenosine A2A receptor antagonist 1,3,7-trimethyl-8-(3-chlorostyryl)xanthine, ATP-sensitive K+ channel blocker glibenclamide or 5-hydroxydecanoic acid, but not by an adenosine A1 receptor antagonist 8-cyclopentyl-1,3-dipropylxanthine, an adenosine A2B receptor antagonist alloxazine or a cyclooxygenase inhibitor indomethacin. The outflow facility induced by 2-H-Ado seems to be independent of increase in intraocular pressure or ATP-sensitive K+ channel. In contrast, the recovery rate in intraocular pressure decreased by hypertonic saline was accelerated by 2-H-Ado, and this response was dependent on ATP-sensitive K+ channel. These results suggest that 2-H-Ado-induced ocular hypertension is mediated via K+ channel opening through adenosine A2A receptor, and this is probably due to aqueous formation, but independent of change in outflow facility or prostaglandin production.

  4. Autophagy occurs within an hour of adenosine triphosphate treatment after nerve cell damage:the neuroprotective effects of adenosine triphosphate against apoptosis

    Institute of Scientific and Technical Information of China (English)

    Na Lu; Baoying Wang; Xiaohui Deng; Honggang Zhao; Yong Wang; Dongliang Li

    2014-01-01

    After hypoxia, ischemia, or inlfammatory injuries to the central nervous system, the damaged cells release a large amount of adenosine triphosphate, which may cause secondary neuronal death. Autophagy is a form of cell death that also has neuroprotective effects. Cell Counting Kit assay, monodansylcadaverine staining, lfow cytometry, western blotting, and real-time PCR were used to determine the effects of exogenous adenosine triphosphate treatment at different concentrations (2, 4, 6, 8, 10 mmol/L) over time (1, 2, 3, and 6 hours) on the apoptosis and autophagy of SH-SY5Y cells. High concentrations of extracellular adenosine triphosphate induced autophagy and apoptosis of SH-SY5Y cells. The enhanced autophagy ifrst appeared, and peaked at 1 hour after treatment with adenosine triphosphate. Cell apoptosis peaked at 3 hours, and persisted through 6 hours. With prolonged exposure to the adenosine triphosphate treatment, the fraction of apoptotic cells increased. These data suggest that the SH-SY5Y neural cells initiated autophagy against apoptosis within an hour of adenosine triphosphate treatment to protect themselves against injury.

  5. Differences in activities of the enzymes of nucleotide metabolism and its implications for cardiac xenotransplantation.

    Science.gov (United States)

    Yuen, A H Y; Khalpey, Z; Lavitrano, M; McGregor, C G A; Kalsi, K K; Yacoub, M H; Smolenski, R T

    2006-01-01

    Xenotransplantation is one be possible solution for a severe shortage of human organs available for transplantation. However, only a few studies addressed metabolic compatibility of transplanted animal organs. Our aim was to compare activities of adenosine metabolizing enzymes in the heart of different species that are relevant to clinical or experimental xenotransplantation. We noted fundamental differences: ecto-5' nucleotidease (E5' N) activity was 4-fold lower in pig and baboon hearts compared to the human hearts while mouse activity was compatible with human and rat activity was three times higher than human. There also were significant differences in AMP-deaminase (AMPD), adenosine deaminase (ADA) and purine nucleoside phosphorylase (PNP) activities. We conclude that differences in nucleotide metabolism may contribute to organ dysfunction after xenotransplantation.

  6. Involvement of adenosine A2a receptor in intraocular pressure decrease induced by 2-(1-octyn-1-yl)adenosine or 2-(6-cyano-1-hexyn-1-yl)adenosine.

    Science.gov (United States)

    Konno, Takashi; Murakami, Akira; Uchibori, Takehiro; Nagai, Akihiko; Kogi, Kentaro; Nakahata, Norimichi

    2005-04-01

    The aim of the present study is to clarify the mechanism for the decrease in intraocular pressure by 2-alkynyladenosine derivatives in rabbits. The receptor binding analysis revealed that 2-(1-octyn-1-yl)adenosine (2-O-Ado) and 2-(6-cyano-1-hexyn-1-yl)adenosine (2-CN-Ado) selectively bound to the A(2a) receptor with a high affinity. Ocular hypotensive responses to 2-O-Ado and 2-CN-Ado were inhibited by the adenosine A(2a)-receptor antagonist 1,3,7-trimethyl-8-(3-chlorostyryl)xanthine (CSC), but not by the adenosine A(1)-receptor antagonist 8-cyclopentyl-1,3-dipropylxanthine (DPCPX) or the adenosine A(2b)-receptor antagonist alloxazine. In addition, 2-O-Ado and 2-CN-Ado caused an increase in outflow facility, which was inhibited by CSC, but not by DPCPX or alloxazine. Moreover, 2-O-Ado and 2-CN-Ado increased cAMP in the aqueous humor, and the 2-O-Ado-induced an increase in cAMP was inhibited by CSC. These results suggest that 2-O-Ado and 2-CN-Ado reduced intraocular pressure via an increase in outflow facility. The ocular hypotension may be mainly mediated through the activation of adenosine A(2a) receptor, although a possible involvement of adenosine A(1) receptor cannot be completely ruled out. 2-O-Ado and 2-CN-Ado are useful lead compounds for the treatment of glaucoma.

  7. Inhibition by adenosine of histamine and leukotriene release from human basophils.

    Science.gov (United States)

    Peachell, P T; Lichtenstein, L M; Schleimer, R P

    1989-06-01

    Adenosine inhibited the release of histamine and leukotriene C4 (LTC4) from immunologically-activated basophils in a dose-dependent manner. Structural congeners of adenosine also attenuated the elaboration of these two mediators from stimulated basophils and a rank order of potency for the inhibition was observed following the sequence 2-chloroadenosine greater than or equal to N-ethylcarboxamidoadenosine (NECA) greater than adenosine greater than or equal to R-phenylisopropyladenosine (R-PIA) greater than or equal to S-PIA. These same nucleosides modulated the generation of LTC4 more potently than the release of histamine. A number of methylxanthines, which are antagonists of cell surface adenosine receptors, reversed the inhibition by adenosine and its congeners of the release of both histamine and LTC4 to varying extents. Dipyridamole and nitrobenzylthioinosine (NBTI), agents that block the intracellular uptake of adenosine, antagonized the inhibition of histamine release by adenosine (and 2-chloroadenosine) but failed to reverse the attenuation of LTC4 generation by the nucleoside. These same uptake blockers were unable to antagonize the inhibitory effects of NECA on either histamine or LTC4 release. In purified basophils, NECA and R-PIA, and in that order of decreasing reactivity, increased total cell cyclic adenosine monophosphate (cAMP) levels and inhibited the stimulated release of mediators. In total, these results suggest that the basophil possesses a cell surface adenosine receptor which, on the basis of both pharmacological and biochemical criteria, most closely conforms to an A2/Ra-like receptor. However, in addition to an interaction at the cell surface, studies with agents that block the intracellular uptake of adenosine suggest that the nucleoside may also exert intracellular effects when countering the release of histamine (but not LTC4).

  8. Sawhorse waveform voltammetry for selective detection of adenosine, ATP, and hydrogen peroxide.

    Science.gov (United States)

    Ross, Ashley E; Venton, B Jill

    2014-08-05

    Fast-scan cyclic voltammetry (FSCV) is an electrochemistry technique which allows subsecond detection of neurotransmitters in vivo. Adenosine detection using FSCV has become increasingly popular but can be difficult because of interfering agents which oxidize at or near the same potential as adenosine. Triangle shaped waveforms are traditionally used for FSCV, but modified waveforms have been introduced to maximize analyte sensitivity and provide stability at high scan rates. Here, a modified sawhorse waveform was used to maximize the time for adenosine oxidation and to manipulate the shapes of cyclic voltammograms (CVs) of analytes which oxidize at the switching potential. The optimized waveform consists of scanning at 400 V/s from -0.4 to 1.35 V and holding briefly for 1.0 ms followed by a ramp back down to -0.4 V. This waveform allows the use of a lower switching potential for adenosine detection. Hydrogen peroxide and ATP also oxidize at the switching potential and can interfere with adenosine measurements in vivo; however, their CVs were altered with the sawhorse waveform and they could be distinguished from adenosine. Principal component analysis (PCA) was used to determine that the sawhorse waveform was better than the triangle waveform at discriminating between adenosine, hydrogen peroxide, and ATP. In slices, mechanically evoked adenosine was identified with PCA and changes in the ratio of ATP to adenosine were observed after manipulation of ATP metabolism by POM-1. The sawhorse waveform is useful for adenosine, hydrogen peroxide, and ATP discrimination and will facilitate more confident measurements of these analytes in vivo.

  9. 75 FR 8981 - Prospective Grant of Exclusive License: Treatment of Glaucoma by Administration of Adenosine A3...

    Science.gov (United States)

    2010-02-26

    ... Glaucoma by Administration of Adenosine A3 Antagonists AGENCY: National Institutes of Health, Public Health.../092,292, entitled ``A3 Adenosine Receptor Antagonists,'' filed July 10, 1998 , PCT Application PCT/US99/ 15562, entitled''A3 Adenosine Receptor Antagonists,'' filed July 2, 1999 , U.S. Patent...

  10. Sensitization of prostate cancer cell lines to 5-fluorocytosine induced by a replication incompetent adenoviral vector carrying a cytosine deaminase transcription unit

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    AIM: To investigate the efficiency of cytosine deaminase adenoviral/5-fluorocytosine system on prostate cancer cell lines. METHODS: Cell culture, infectivity test and sensitivity test, observing the bystander effect and animal model experiment were carried out. RESULTS: All the established prostate cancer cell lines were eventually infectable, but ratio of vector/cell and time of exposed at which infection occurs was dependent on the cell lines. The expression of transfered cytosine deaminase gene peaked at different days, but persisted beyond 11 days. The prostate cell lines were sensitized to the 5-fluorocytosine by infection with the cytosine deaminase gene adenoviral vector, and only 5% of the LNCap and 10% of the RM-1 cells infected were required for 100% cell death. In the animal model, there was significant eradiation of tumor growth at the ratio of 400 vector particles/cell and with the systematic treatment of 5-fluorocytosine. CONCLUSION: The adenoviral vector carrying a cytosine deaminase transcription unit can sensitize the prostate cancer cell lines to 5-fluorocytosine, and the system can significantly inhibit the growth of prostatic tumor in mice.

  11. AN ESCHERICHIA-COLI STRAIN DEFICIENT FOR BOTH EXONUCLEASE-V AND DEOXYCYTIDINE TRIPHOSPHATE DEAMINASE SHOWS ENHANCED SENSITIVITY TO IONIZING-RADIATION

    NARCIS (Netherlands)

    ESTEVENON, AM; KOOISTRA, J; SICARD, N

    1995-01-01

    An Escherichia coli mutant lacking deoxycytidine triphosphate deaminase (Dcd) activity and an unknown function encoded by a gene designated ior exhibits sensitivity to ionizing radiation whereas dcd mutants themselves are not sensitive. A DNA fragment from an E. coli genomic library that restores th

  12. The cloned 1-aminocyclopropane-1-carboxylate (ACC) deaminase gene from Sinorhizobium sp. strain BL3 in Rhizobium sp. strain TAL1145 promotes nodulation and growth of Leucaena leucocephala.

    Science.gov (United States)

    Tittabutr, Panlada; Awaya, Jonathan D; Li, Qing X; Borthakur, Dulal

    2008-06-01

    The objective of this study was to determine the role of 1-aminocyclopropane-1-carboxylate (ACC) deaminase of symbionts in nodulation and growth of Leucaena leucocephala. The acdS genes encoding ACC deaminase were cloned from Rhizobium sp. strain TAL1145 and Sinorhizobium sp. BL3 in multicopy plasmids, and transferred to TAL1145. The BL3-acdS gene greatly enhanced ACC deaminase activity in TAL1145 compared to the native acdS gene. The transconjugants of TAL1145 containing the native or BL3 acdS gene could grow in minimal media containing 1.5mM ACC, whereas BL3 could tolerate up to 3mM ACC. The TAL1145 acdS gene was inducible by mimosine and not by ACC, while the BL3 acdS gene was highly inducible by ACC and not by mimosine. The transconjugants of TAL1145 containing the native- and BL3-acdS genes formed nodules with greater number and sizes, and produced higher root mass on L. leucocephala than by TAL1145. This study shows that the introduction of multiple copies of the acdS gene increased ACC deaminase activities of TAL1145 and enhanced its symbiotic efficiency on L. leucocephala.

  13. DENATURING GRADIENT GEL-ELECTROPHORESIS FOR RAPID DETECTION OF LATENT CARRIERS OF A SUBTYPE OF ACUTE INTERMITTENT PORPHYRIA WITH NORMAL ERYTHROCYTE PORPHOBILINOGEN DEAMINASE ACTIVITY

    NARCIS (Netherlands)

    BOURGEOIS, F; GU, XF; DEYBACH, JC; VELDE, MPT; DEROOIJ, F; NORDMANN, Y; GRANDCHAMP, B

    1992-01-01

    Acute intermittent porphyria is an autosomal dominant disorder defined by a partial deficiency of porphobilinogen deaminase (EC 4.3.1.8). Clinical manifestations of the disease are characterized by acute attacks of neurological dysfunction often linked to environmental factors. Early diagnosis of ge

  14. Characterization of ACC deaminase-producing endophytic bacteria isolated from copper-tolerant plants and their potential in promoting the growth and copper accumulation of Brassica napus.

    Science.gov (United States)

    Zhang, Yan-Feng; He, Lin-Yan; Chen, Zhao-Jin; Wang, Qing-Ya; Qian, Meng; Sheng, Xia-Fang

    2011-03-01

    One hundred Cu-resistant-endophytic bacteria were isolated from Cu-tolerant plants grown on Cu mine wasteland, of which, eight Cu-resistant and 1-aminocyclopropane-1-carboxylate (ACC) deaminase-producing endophytic bacteria were obtained based on the ACC deaminase activity of the bacteria and characterized with respect to metal resistance, production of ACC deaminase, indole-3-acetic acid (IAA) as well as siderophores and mineral phosphate solubilization. Ralstonia sp. J1-22-2, Pantoea agglomerans Jp3-3, and Pseudomonas thivervalensis Y1-3-9 with higher ACC deaminase activity (ranging from 213 to 370 μM α-ketobutyrate mg(-1)h(-1)) were evaluated for promoting plant growth and Cu uptake of rape grown in quartz sand containing 0, 2.5, and 5 mg kg(-1) of Cu in pot experiments. The eight bacteria were found to exhibit different multiple heavy metal resistance characteristics, to show different levels of ACC deaminase activity and to produce indole acetic acid. Seven bacteria produced siderophores and solubilized inorganic phosphate. Pot experiments showed that inoculation with the strains (J1-22-2, Jp3-3, and Y1-3-9) was found to increase the biomass of rape. Increases in above-ground tissue Cu contents of rape cultivated in 2.5 and 5 mg kg(-1) of Cu-contaminated substrates varied from 9% to 31% and from 3 to 4-fold respectively in inoculated-rape plants compared to the uninoculated control. The maximum Cu uptake of rape was observed after inoculation with P. agglomerans Jp3-3. The results show that metal-resistant and plant growth promoting endophytic bacteria play an important role in plant growth and Cu uptake which may provide a new endophytic bacterial-assisted phytoremediation of Cu-contaminated environment.

  15. Evidence for evoked release of adenosine and glutamate from cultured cerebellar granule cells

    Energy Technology Data Exchange (ETDEWEB)

    Schousboe, A.; Frandsen, A.; Drejer, J. (Univ. of Copenhagen (Denmark))

    1989-09-01

    Evoked release of ({sup 3}H)-D-aspartate which labels the neurotransmitter glutamate pool in cultured cerebellar granule cells was compared with evoked release of adenosine from similar cultures. It was found that both adenosine and (3H)-D-aspartate could be released from the neurons in a calcium dependent manner after depolarization of the cells with either 10-100 microM glutamate or 50 mM KCl. Cultures of cerebellar granule cells treated with 50 microM kainate to eliminate GABAergic neurons behaved in the same way. This together with the observation that cultured astrocytes did not exhibit a calcium dependent, potassium stimulated adenosine release strongly suggest that cerebellar granule cells release adenosine in a neurotransmitter-like fashion together with glutamate which is the classical neurotransmitter of these neurons. Studies of the metabolism of adenosine showed that in the granule cells adenosine is rapidly metabolized to ATP, ADP, and AMP, but in spite of this, adenosine was found to be released preferential to ATP.

  16. Role of adenosine signalling and metabolism in β-cell regeneration

    Energy Technology Data Exchange (ETDEWEB)

    Andersson, Olov, E-mail: olov.andersson@ki.se

    2014-02-01

    Glucose homeostasis, which is controlled by the endocrine cells of the pancreas, is disrupted in both type I and type II diabetes. Deficiency in the number of insulin-producing β cells – a primary cause of type I diabetes and a secondary contributor of type II diabetes – leads to hyperglycemia and hence an increase in the need for insulin. Although diabetes can be controlled with insulin injections, a curative approach is needed. A potential approach to curing diabetes involves regenerating the β-cell mass, e.g. by increasing β-cell proliferation, survival, neogenesis or transdifferentiation. The nucleoside adenosine and its cognate nucleotide ATP have long been known to affect insulin secretion, but have more recently been shown to increase β-cell proliferation during homeostatic control and regeneration of the β-cell mass. Adenosine is also known to have anti-inflammatory properties, and agonism of adenosine receptors can promote the survival of β-cells in an inflammatory microenvironment. In this review, both intracellular and extracellular mechanisms of adenosine and ATP are discussed in terms of their established and putative effects on β-cell regeneration. - Highlights: • A potential way to cure diabetes is to regenerate the β-cell mass by promoting cell survival, proliferation or neogenesis. • Adenosine may promote β-cell regeneration through several cellular mechanisms. • Adenosine and its cognate nucleotide ATP can each promote β-cell proliferation. • Do adenosine and ATP interact in promoting β-cell proliferation?.

  17. The A2B adenosine receptor impairs the maturation and immunogenicity of dendritic cells.

    Science.gov (United States)

    Wilson, Jeffrey M; Ross, William G; Agbai, Oma N; Frazier, Renea; Figler, Robert A; Rieger, Jayson; Linden, Joel; Ernst, Peter B

    2009-04-15

    The endogenous purine nucleoside adenosine is an important antiinflammatory mediator that contributes to the control of CD4(+) T cell responses. While adenosine clearly has direct effects on CD4(+) T cells, it remains to be determined whether actions on APC such as dendritic cells (DC) are also important. In this report we characterize DC maturation and function in BMDC stimulated with LPS in the presence or absence of the nonselective adenosine receptor agonist NECA (5'-N-ethylcarboxamidoadenosine). We found that NECA inhibited TNF-alpha and IL-12 in a concentration-dependent manner, whereas IL-10 production was increased. NECA-treated BMDC also expressed reduced levels of MHC class II and CD86 and were less effective at stimulating CD4(+) T cell proliferation and IL-2 production compared with BMDC exposed to vehicle control. Based on real-time RT-PCR, the A(2A) adenosine receptor (A(2A)AR) and A(2B)AR were the predominant adenosine receptors expressed in BMDC. Using adenosine receptor subtype selective antagonists and BMDC derived from A(2A)AR(-/-) and A(2B)AR(-/-)mice, it was shown that NECA modulates TNF-alpha, IL-12, IL-10, and CD86 responses predominantly via A(2B)AR. These data indicate that engagement of A(2B)AR modifies murine BMDC maturation and suggest that adenosine regulates CD4(+) T cell responses by selecting for DC with impaired immunogencity.

  18. Adenosine Monophosphate-Based Detection of Bacterial Spores

    Science.gov (United States)

    Kern, Roger G.; Chen, Fei; Venkateswaran, Kasthuri; Hattori, Nori; Suzuki, Shigeya

    2009-01-01

    A method of rapid detection of bacterial spores is based on the discovery that a heat shock consisting of exposure to a temperature of 100 C for 10 minutes causes the complete release of adenosine monophosphate (AMP) from the spores. This method could be an alternative to the method described in the immediately preceding article. Unlike that method and related prior methods, the present method does not involve germination and cultivation; this feature is an important advantage because in cases in which the spores are those of pathogens, delays involved in germination and cultivation could increase risks of infection. Also, in comparison with other prior methods that do not involve germination, the present method affords greater sensitivity. At present, the method is embodied in a laboratory procedure, though it would be desirable to implement the method by means of a miniaturized apparatus in order to make it convenient and economical enough to encourage widespread use.

  19. Adenosine-5'-phosphosulfate kinase is essential for Arabidopsis viability.

    Science.gov (United States)

    Mugford, Sarah G; Matthewman, Colette A; Hill, Lionel; Kopriva, Stanislav

    2010-01-04

    In Arabidopsis thaliana, adenosine-5'-phosphosulfate kinase (APK) provides activated sulfate for sulfation of secondary metabolites, including the glucosinolates. We have successfully isolated three of the four possible triple homozygous mutant combinations of this family. The APK1 isoform alone was sufficient to maintain WT levels of growth and development. Analysis of apk1 apk2 apk3 and apk1 apk3 apk4 mutants suggests that APK3 and APK4 are functionally redundant, despite being located in cytosol and plastids, respectively. We were, however, unable to isolate apk1 apk3 apk4 mutants, most probably because the apk1 apk3 apk4 triple mutant combination is pollen lethal. Therefore, we conclude that APS kinase is essential for plant reproduction and viability.

  20. Ilíada Latina: tradução e estudo literário da adaptação da Ilíada de Homero na antiguidade latina

    OpenAIRE

    2012-01-01

    O poema Ilíada Latina é um adaptação resumida em latim da Ilíada, da época de Nero. Já no século I a.C., o mito troiano passou a ser cada vez menos conhecido através da Ilíada, já que o grego era apenas aprendido pela elite romana. Durante a Idade Média, o grego deixou de ser aprendido no Ocidente, e assim, a Ilíada se perdeu durante esse período, até que estudiosos italianos começaram a aprender grego com os viajantes bizantinos no século XIV. A história da guerra de Troia, portanto, passou ...