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Sample records for rat liver preparations

  1. Preparation of rough microsomes from rat liver.

    Science.gov (United States)

    Sabatini, David D

    2014-08-01

    This protocol describes how to prepare rat liver rough microsomes that contain undegraded membrane-bound polysomes and can function very well in an in vitro translation system. It uses endogenous ribonuclease inhibitor in all steps, avoiding pelleting rough microsomes in all steps and sacrificing good recovery.

  2. The Disposition of Oxymatrine in the Vascularly Perfused Rat Intestine-Liver Preparation and Its Metabolism in Rat Liver Microsomes.

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    Huang, Li Hua; Zhong, Yun Ming; Xiong, Xiao Hong; Cen, Mei Feng; Cheng, Xuan Ge; Wang, Gui Xiang; Chen, Ji Sheng; Wang, Su Jun

    2016-02-01

    The study was aimed to investigate the absorption and metabolism of oxymatrine (OMT) which contributed to its poor bioavailability. Determinations of OMT absorption and metabolism in rats were evaluated using techniques of the in situ perfused rat intestine-liver preparation and recirculated intestine preparation. Furthermore, chemical inhibition experiments in rat liver microsomes were used to determine the principal cytochrome P450 (CYP) isoforms involved in OMT metabolism. In the intestine-liver preparation, the steady state liver extraction ratio (0.753 ± 0.054) of OMT was 33 times higher than that for the intestine (0.023 ± 0.002). The portal vein mainly consisted of OMT, and was devoid of the metabolite matrine, whereas both OMT and matrine were detected in hepatic vein. With the intestine preparation, the extent of OMT absorption at the end of 120 min of perfusion was 4.79 ± 0.352%. The first-order rate constant for OMT absorption was 0.05 ± 0.003 min(-1). The inhibitor of CYP3A2 had strong inhibitory effect on OMT metabolism in a concentration-dependent manner, and value was reduced to 29.73% of control. The 2 perfusion techniques indicated that poor bioavailability of OMT in rats is due mostly to poor absorption and higher hepatic elimination and CYP3A2 appears to contribute to OMT metabolism in rat liver.

  3. Primary culture of adult rat liver cells. I. Preparation of isolated cells from trypsin-perfused liver of adult rat

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    Miyazaki,Masahiro

    1977-12-01

    Full Text Available Isolated hepatic cells from adult rats were prepared by perfusing the livers with trypsin. The highest yield of viable cells was obtained by perfusing the liver with 0.1% trypsin, pH 7.0, at 37 degrees C for 30 min. Following this treatment about 70% of cells excluded trypan blue. The isolated cells contained many binucleate cells. Between 60 and 70% of DNA present originally in the liver was recovered from the isolated hepatic cells, which had higher glucose 6-phosphatase activity than the liver. Thus the resulting cell population seems to be rich in hepatocytes. The isolated hepatic cells, however, lost some of their cellular proteins such as alanine and tyrosine amino-transferases. It was suggested that the membranes of isolated hepatic cells might be damaged by both enzymatic digestion and mechanical destruction.

  4. Preparation and Primary Culture of Liver Cells Isolated from Adult Rats by Dispase Perfusion

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    Wahid,Syarifuddin

    1984-06-01

    Full Text Available The dispase perfusion technique was used to isolate liver cells from adult rats. The optimum conditions for obtaining many isolated liver cells with high viability were an enzyme concentration of 2000 U/ml, a pH of 7.5 and a perfusion time of 20 min. The population of isolated liver cells prepared with dispase consisted of 43.6% cells with diameters less than 20 micron and 56.4% cells with diameters above 20 micron. The isolated liver cells were cultured in basal culture medium either supplemented with or without dexamethasone (1 X 10(-5M and insulin (10 micrograms/ml. The addition of hormones to the culture medium improved the attachment efficiency of the isolated liver cells and delayed the disappearance of mature hepatocytes. Epithelial-like clear cells proliferated early in primary culture even in the presence of hormones. Therefore, functioning mature hepatocytes and proliferating epithelial-like clear cells coexisted well in the hormone-containing medium. Furthermore, the number of cultured cells reached a maximal level earlier in the presence of hormones than in the absence of hormones. The level of TAT activity in primary cultured cells was higher up to 3 days after inoculation in the presence of hormones than in their absence. No difference between G6Pase activity in primary cultured cells in the presence of hormones and that in the absence of hormones was found.

  5. Preparation of ribosome-free membranes from rat liver microsomes by means of lithium chloride

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    Scott-Burden, T.; Hawtrey, A. O.

    1969-01-01

    1. Treatment of washed rat liver microsomes in a medium containing 0·12m-sucrose, 12·5mm-potassium chloride, 2·5mm-magnesium chloride and 25mm-tris–hydrochloric acid buffer, pH7·6, with 2m-lithium chloride at 5° for 16hr. leads to the formation of membranes free of ribosomes and ribosomal subunits. 2. Confirmation of the absence of ribosomes from lithium chloride-prepared membranes was obtained by treatment of the membranes with sodium deoxycholate, followed by sucrose-density-gradient centrifugation, which showed the complete absence of ribosomes. 3. Treatment of membranes with phenol, followed by sucrose-density-gradient analysis of the isolated RNA, showed the presence of a small amount of 4s material. Repetition of the phenol extraction procedure in the presence of liver cell sap as a ribonuclease inhibitor again showed the presence of only 4s material. The 4s RNA was shown to be transfer RNA by the fact that it had the same capacity for accepting 14C-labelled amino acids as isolated transfer RNA from rat liver pH5 enzyme. 4. Analysis showed that microsomes and membranes possessed similar glucose 6-phosphatase, NADH–2,6-dichlorophenol-indophenol reductase, NADH–neo-tetrazolium reductase, NADH–cytochrome c reductase and ribonuclease activities. 5. 3H-labelled ribosomal RNA binds to membranes. However, isolation of the bound RNA by the phenol extraction procedure, followed by sucrose-density-gradient analysis, shows the RNA to be degraded to 7s material. Very little breakdown of 3H-labelled ribosomal RNA bound to membranes occurs if the binding and isolation are carried out in the presence of liver cell sap. ImagesPLATE 1 PMID:4311814

  6. A novel nanosuspension of andrographolide: Preparation, characterization and passive liver target evaluation in rats.

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    Guo, Ligang; Kang, Le; Liu, Xinrong; Lin, Xiangyun; Di, Donghua; Wu, Yong; Kong, Dexian; Deng, Yihui; Song, Yanzhi

    2017-03-14

    Andrographolide (Andro) is an excellent anti-inflammatory bicyclic diterpene γ-lactone. However, the poor solubility limits its application as injection for the treatment of acute inflammation. To meet the clinical needs for emergency, the Andro nanosuspensions injection was first prepared by the wet milling technique. The Andro nanosuspensions were composed of 3% Andro, 5% poloxamer 188 as the non-ionic stabilizer, 0.05% sodium deoxycholate or 0.1% sodium tauroursodeoxy cholate as the ionic stabilizer, and prepared by 350rpm speed and 12cycles of grinding with 0.4mm zirconium oxide pearls. The nanosuspensions showed hexagonal morphology with particle size of 300nm, and no change in crystalline state of Andro after milling. The nanosuspensions had a significant increase in saturation solubility, and could completely release within 0.25h (bulk Andro within 24h). The lyophilized product of Andro nanosuspensions with mannitol (5%) as lyoprotectant had good physical and chemical stability during the 6-month storage period. The pharmacokinetic and tissue distribution results showed that it was rapidly eliminated from the blood and largely distributed in the liver. Overall, the Andro nanosuspensions may be used as a potential formulation for the treatment of liver infections owing to its passive liver targeting function.

  7. CHARACTERIZATION OF THE IN VITRO METABOLISM OF SELECTIVE ANDROGEN RECEPTOR MODULATOR USING HUMAN, RAT, AND DOG LIVER ENZYME PREPARATIONS

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    Gao, Wenqing; Wu, Zengru; Bohl, Casey E.; Yang, Jun; Miller, Duane D.; Dalton, James T.

    2007-01-01

    Compound S4 [S-3-(4-acetylamino-phenoxy)-2-hydroxy-2-methyl-N-(4-nitro-3-trifluoromethyl-phenyl)-propionamide] is a novel nonsteroidal selective androgen receptor modulator that demonstrates tissue-selective androgenic and anabolic effects. The purpose of this in vitro study was to identify the phase I metabolites, potential species differences in metabolism, and the cytochromes P450 (P450s) involved in the phase I metabolism of S4 using 14C-S4, recombinant P450s, and other liver enzyme preparations from human, rat, and dog. The major phase I metabolism pathways of S4 in humans were identified as deacetylation of the B-ring acetamide group, hydrolysis of the amide bond, reduction of the A-ring nitro group, and oxidation of the aromatic rings, with deacetylation being the predominant pathway observed with most of the enzyme preparations tested. Among the major human P450 enzymes tested, CYP3A4 appeared to be one of the major phase I enzymes that could be responsible for the phase I metabolism of S4 [Km = 16.1 μM, Vmax = 1.6 pmol/(pmol · min)] in humans and mainly catalyzed the deacetylation, hydrolysis, and oxidation of S4. In humans, the cytosolic enzymes mainly catalyzed the hydrolysis reaction, whereas the microsomal enzymes primarily catalyzed the deacetylation reactions. Similar phase I metabolic profiles were observed in rats and dogs as well, except that the amide bond hydrolysis seemed to occur more rapidly in rats. In summary, these results showed that the major phase I reaction of S4 in human, rat, and dog is acetamide group deacetylation. PMID:16272404

  8. Inhibition of Sterol Biosynthesis by 2-Isopropyl-4-dimethylamino-5-methylphenyl-1-piperidine Carboxylate Methyl Chloride in Tobacco and Rat Liver Preparations.

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    Douglas, T J; Paleg, L G

    1972-03-01

    2-Isopropyl-4-dimethylamino-5-methylphenyl-1-piperidine carboxylate methyl chloride, 90%, applied to rootless tobacco (Nicotiana tabacum cv. Samson) seedlings inhibits the incorporation of (14)C-mevalonate into sterols. Concomitantly, the retardant causes the accumulation of squalene-2,3-epoxide, an intermediate in sterol biosynthesis. The results with tobacco are identical to those produced by the retardant in cell-free rat liver preparations.

  9. Técnica para preparo angioarquitetônico hepático de ratos Preparation technique for angioarquitetonic liver model in rats

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    Vitormauro Araújo da Silva

    2000-09-01

    Full Text Available Os métodos de injeção-corrosão são os principais métodos utilizados para o estudo da anatomia vascular do fígado. Alguns autores mencionam a técnica para estudo de fígado de cães, porcos, hamsters, coelhos e gatos, entretanto são escassos os trabalhos que mencionam o estudo da anatomia hepática de ratos. Desta forma é importante o conhecimento de novas técnicas de preparo para modelos angioarquitetônico de fígados, possibilitando um melhor conhecimento da anatomia e por conseguinte, aperfeiçoando significativamente a abordagem operatória deste órgão. Em função disso o objetivo do presente estudo é demonstrar a técnica para realização de angioarquitetura venosa do fígado de ratos. Foram utilizados 10 Rattus norvegicus albinus (Wistar, com massa corporal entre 250 e 300g, para verificar a funcionalidade do método. A técnica para preparo de modelo vascular apresenta três tempos fundamentais: cateterização da veia porta, veia cava intra-abdominal e veia cava intra-torácica; preparo e infusão da solução de acrílico; corrosão em ácido clorídrico e maceração da peça. Concluímos que, esta técnica é factível e apresenta como vantagem um baixo custo (30 dólares e com a utilização de duas cores diferentes de tinta pode-se separar o sistema vascular portal do sistema de drenagem supra-hepático, portanto sendo capaz de moldar a estrutura vascular hepática de ratos.The injection-erosion methods are the principal methods used for the study of the vascular anatomy of the liver. Some authors mention the technique for study of liver of dogs, pigs, hamsters, rabbits and cats, however they are scarce the works that mention the study of the hepatic anatomy of rats. This way it is important the knowledge of new preparation techniques for angioarquitetonic livers' models, making possible a better knowledge of the anatomy and consequently, improving the operative approach of this organ significantly. Due above of that

  10. Importance Rat Liver Morphology and Vasculature in Surgical Research.

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    Vdoviaková, Katarína; Vdoviaková, Katarína; Petrovová, Eva; Krešáková, Lenka; Maloveská, Marcela; Teleky, Jana; Jenčová, Janka; Živčák, Jozef; Jenča, Andrej

    2016-12-02

    BACKGROUND The laboratory rat is one of the most popular experimental models for the experimental surgery of the liver. The objective of this study was to investigate the morphometric parameters, physiological data, differences in configuration of liver lobes, biliary system, and vasculature (arteries, veins, and lymphatic vessels) of the liver in laboratory rats. In addition, this study supports the anatomic literature and identified similarities and differences with human and other mammals. MATERIAL AND METHODS Forty laboratory rats were dissected to prepare corrosion casts of vascular system specimens (n=20), determine the lymph vessels and lymph nodes (n=10), and for macroscopic anatomical dissection (n=10) of the rat liver. The results are listed in percentages. The anatomical nomenclature of the liver morphology, its arteries, veins, lymph nodes, and lymphatic vessels are in accordance with Nomina Anatomica Veterinaria. RESULTS We found many variations in origin, direction, and division of the arterial, venous, and lymphatic systems in rat livers, and found differences in morphometric parameters compared to results reported by other authors. The portal vein was formed by 4 tributaries in 23%, by 3 branches in 64%, and by 2 tributaries in 13%. The liver lymph was drained to the 2 different lymph nodes. The nomenclature and morphological characteristics of the rat liver vary among authors. CONCLUSIONS Our results may be useful for the planing of experimental surgery and for cooperation with other investigation methods to help fight liver diseases in human populations.

  11. Phosphatidylcholine mobility in bile salt depleted rat liver microsomes

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    Oliveira Filgueiras, O.M. de; Defize, B.; Echteld, C.J.A. van; Bosch, H. van den

    1980-01-01

    Rat liver microsomes prepared by differential centrifugation are known to contain measurable levels of bile salts. More than 90% of these can be removed by passing the microsomal preparation through a Bio-Gel A-150m column. Bile salt depleted microsomes show a high level (> 95%) of mannose-6-phospha

  12. Laparoscopy of rats with experimental liver metastases

    DEFF Research Database (Denmark)

    Kobaek-Larsen, Morten; Rud, Lene; Østergaard-Sørensen, Finn

    2004-01-01

    condition. Liver metastases were modelled by hepatic subcapsular injection of a syngeneic rat colon cancer cell line (DHD/K12-PROb) in BDIX/OrlIco rats. In this study, we present a detailed description of a laparoscopic technique for the direct inspection of liver metastases. That way a qualitative...

  13. In vitro identification of metabolitesof verapamil in rat liver microsomes

    Institute of Scientific and Technical Information of China (English)

    LuSUN; Shu-qiuZHANG; Da-fangZHONG

    2004-01-01

    AIM: To investigate the metabolism of verapamil at low concentrations in rat liver microsomes. METHODS: Liver microsomes of Wistar rats were prepared using ultracentrifuge method. The in vitro metabolism of verapamil was studied with the rat liver microsomal incubation at concentration of 1.0 μmol/L and 5.0 μmol/L. The metabolites were separated and assayed by liquid chromatography-ion trap mass spectrometry (LC/MSn), and further identified by comparison of their mass spectra and chromatographic behaviors with reference substances. RESULTS: Eightmetabolites, including two novel metabolites (M4 and MS), were found in rat liver microsomal incubates. They were identified as O-demethyl-verapamil isomers (M1 - M4), N-dealkylated derivatives of verapamil (MS-MT), and N, O-didemethyl-verapamil (MS). CONCLUSION: O-Demethylation and N-dealkylation were the main metabolic pathways of verapamil at low concentrations in rat liver microsomes, and the relative proportion of them in verapamil metabolism changed with different substrate concentrations.

  14. Liver transplantation in the rat

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    E.D. Wolff (Eric)

    1976-01-01

    textabstractDuring the past ten years progress in the field of vascular surgery and immunology has been such, that a steady improvement in the results of clinical organ transplantation can be observed. Also when a life threatening disease of the liver is present, liver transplantation may be conside

  15. Liver uptake of biguanides in rats.

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    Sogame, Yoshihisa; Kitamura, Atsushi; Yabuki, Masashi; Komuro, Setsuko

    2011-09-01

    Metformin is an oral antihyperglycaemic agent widely used in the management of non-insulin-dependent diabetes mellitus. The liver is the primary target, metformin being taken up into human and rat hepatocytes via an active transport mechanism. The present study was designed to compare hepatic uptake of two biguanides, metformin and phenformin, in vitro and in vivo. In in vitro experiments, performed using rat cryopreserved hepatocytes, phenformin exhibited a much higher affinity and transport than metformin, with marked differences in kinetics. The K(m) values for metformin and phenformin were 404 and 5.17μM, respectively, with CLint (V(max)/K(m)) values 1.58μl/min per 10(6) cells and 34.7μl/min per 10(6) cells. In in vivo experiments, when (14)C-metformin and (14)C-phenformin were given orally to male rats at a dose of 50mg/kg, the liver concentrations of radioactivity at 0.5 hour after dosing were 21.5μg eq./g with metformin but 147.1μg eq./g for phenformin, ratios of liver to plasma concentrations being 4.2 and 61.3, respectively. In conclusion, the results suggest that uptake of biguanides by rat hepatocytes is in line with the liver distribution found in vivo, phenformin being more efficiently taken up by liver than metformin after oral administration.

  16. Age dependence of rat liver function measurements

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    Fischer-Nielsen, A; Poulsen, H E; Hansen, B A

    1989-01-01

    Changes in the galactose elimination capacity, the capacity of urea-N synthesis and antipyrine clearance were studied in male Wistar rats at the age of 8, 20 and 44 weeks. Further, liver tissue concentrations of microsomal cytochrome P-450, microsomal protein and glutathione were measured. All...... liver function measurements increased from the age of 8 to 44 weeks when expressed in absolute values. In relation to body weight, these function measurements were unchanged or reduced from week 8 to week 20. At week 44, galactose elimination capacity and capacity of urea-N synthesis related to body...... weight were increased by 10% and 36%, respectively, and antipyrine plasma clearance was reduced to 50%. Liver tissue concentrations of microsomal cytochrome P-450 and microsomal protein increased with age when expressed in absolute values, but were unchanged per g liver, i.e., closely related to liver...

  17. Ozone inhalation modifies the rat liver proteome

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    Whitney S. Theis

    2014-01-01

    Full Text Available Ozone (O3 is a serious public health concern. Recent findings indicate that the damaging health effects of O3 extend to multiple systemic organ systems. Herein, we hypothesize that O3 inhalation will cause downstream alterations to the liver. To test this, male Sprague-Dawley rats were exposed to 0.5 ppm O3 for 8 h/day for 5 days. Plasma liver enzyme measurements showed that 5 day O3 exposure did not cause liver cell death. Proteomic and mass spectrometry analysis identified 10 proteins in the liver that were significantly altered in abundance following short-term O3 exposure and these included several stress responsive proteins. Glucose-regulated protein 78 and protein disulfide isomerase increased, whereas glutathione S-transferase M1 was significantly decreased by O3 inhalation. In contrast, no significant changes were detected for the stress response protein heme oxygenase-1 or cytochrome P450 2E1 and 2B in liver of O3 exposed rats compared to controls. In summary, these results show that an environmentally-relevant exposure to inhaled O3 can alter the expression of select proteins in the liver. We propose that O3 inhalation may represent an important unrecognized factor that can modulate hepatic metabolic functions.

  18. Quercetin protection against ciprofloxacin induced liver damage in rats.

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    Taslidere, E; Dogan, Z; Elbe, H; Vardi, N; Cetin, A; Turkoz, Y

    2016-01-01

    Ciprofloxacin is a common, broad spectrum antibacterial agent; however, evidence is accumulating that ciprofloxacin may cause liver damage. Quercetin is a free radical scavenger and antioxidant. We investigated histological changes in hepatic tissue of rats caused by ciprofloxacin and the effects of quercetin on these changes using histochemical and biochemical methods. We divided 28 adult female Wistar albino rats into four equal groups: control, quercetin treated, ciprofloxacin treated, and ciprofloxacin + quercetin treated. At the end of the experiment, liver samples were processed for light microscopic examination and biochemical measurements. Sections were prepared and stained with hematoxylin and eosin, and a histopathologic damage score was calculated. The sections from the control group appeared normal. Hemorrhage, inflammatory cell infiltration and intracellular vacuolization were observed in the ciprofloxacin group. The histopathological findings were reduced in the group treated with quercetin. Significant differences were found between the control and ciprofloxacin groups, and between the ciprofloxacin and ciprofloxacin + quercetin groups. Quercetin administration reduced liver injury caused by ciprofloxacin in rats. We suggest that quercetin may be useful for preventing ciprofloxacin induced liver damage.

  19. Abnormal hepatic copper accumulation of spheroid composed of liver cells from LEC rats in vitro.

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    Ueno, K; Yoshizawa, M; Satoh, T; Yoneda, S; Ohmichi, M; Yamazaki, M; Mori, Y; Suzuki, K T

    1995-11-01

    The LEC rat is a mutant strain displaying hereditary hepatitis, and shows abnormal accumulation of copper (Cu) similar to that occurring in Wilson's disease. We prepared a multicellular spheroid composed of LEC rat liver cells to investigate the mechanism for abnormal accumulation of Cu. These multicellular spheroids were prepared by detaching the monolayer on the collagen-conjugated thermo-responsive polymer coated culture dish at a temperature below the critical solution temperature and culturing on the non-adhesive substratum. Long-term cultured spheroids of LEC rat liver cells as well as SD rat liver cells were attempted. Non-parenchymal cells obtained by collagenase perfusion from the LEC liver were fewer than those from the SD liver. Cells from the LEC rat, over 11 weeks of age, did not form a cell sheet; however, a mixture of parenchymal cells from LEC rats over aged 11 weeks and non-parenchymal cells from SD rats of any age yielded intact spheroids. We examined the toxicity, the accumulation and distribution of Cu in spheroids. The accumulation of Cu in LEC spheroids was higher than that in SD spheroids. Results suggest that spheroids consisting of LEC liver cells are useful as an alternative model to in vivo tests to investigate the mechanism for abnormal accumulation of Cu in liver.

  20. Electrochemotherapy for rat implanted liver tumour

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    @@ The most common interventional therapies for liver cancer at present include transcatheter hepatic arterial chemoembolization (TACE),1 percutaneous ethanol injection2 and radiofrequency ablation,3 but all these therapies have some intrinsic disadvantages. Since the advent of electrochemo- therapy (EChT), it has been accepted as a safe and effective therapy for malignant tumors4,5 There are only a few experimental studies reporting the use of EChT in the treatment of liver cancer in the foreign medical literature.6-8 However, there have been some clinical studies, and even fewer reports of experimental studies on EChT for liver cancer in China. We used a rat implanted liver cancer animal model to monitor changes in tumour size, tumour necrosis, cellular apoptosis, expression of peripheral immunological markers (IL-2, sIL-2R, IL-6 and TNF-α) and survival.

  1. Chronological protein synthesis in regenerating rat liver.

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    He, Jinjun; Hao, Shuai; Zhang, Hao; Guo, Fuzheng; Huang, Lingyun; Xiao, Xueyuan; He, Dacheng

    2015-07-01

    Liver regeneration has been studied for decades; however, its regulation remains unclear. In this study, we report a dynamic tracing of protein synthesis in rat regenerating liver with a new proteomic technique, (35) S in vivo labeling analysis for dynamic proteomics (SiLAD). Conventional proteomic techniques typically measure protein alteration in accumulated amounts. The SiLAD technique specifically detects protein synthesis velocity instead of accumulated amounts of protein through (35) S pulse labeling of newly synthesized proteins, providing a direct way for analyzing protein synthesis variations. Consequently, protein synthesis within short as 30 min was visualized and protein regulations in the first 8 h of regenerating liver were dynamically traced. Further, the 3.5-5 h post partial hepatectomy (PHx) was shown to be an important regulatory turning point by acute regulation of many proteins in the initiation of liver regeneration.

  2. Isolation of hydroxy-Y base from rat liver tRNAPhe.

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    Kasai, H; Yamaizumi, Z; Kuchino, Y; Nishimura, S

    1979-03-01

    A Y-base derivative was isolated from rat liver tRNAPhe and its structure was assigned to be alpha-(carboxyamino)-beta-hydroxy-4,9-dihydro-4,6-dimethyl-9-oxo-1H-imidazol[1,2-a]purine-7-butyric acid dimethyl ester (hydroxy-Y), based on the results of mass spectrometry and chemical degradation. This modified base seems to be the major fluorescent component of rat liver tRNAPhe; the peroxy-Y base previously isolated from rat liver tRNAPhe and characterized by Nakanishi and his coworkers (1,2) was not present in our preparation.

  3. Generation and characterization of rat liver stem cell lines and their engraftment in a rat model of liver failure.

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    Kuijk, Ewart W; Rasmussen, Shauna; Blokzijl, Francis; Huch, Meritxell; Gehart, Helmuth; Toonen, Pim; Begthel, Harry; Clevers, Hans; Geurts, Aron M; Cuppen, Edwin

    2016-02-26

    The rat is an important model for liver regeneration. However, there is no in vitro culture system that can capture the massive proliferation that can be observed after partial hepatectomy in rats. We here describe the generation of rat liver stem cell lines. Rat liver stem cells, which grow as cystic organoids, were characterized by high expression of the stem cell marker Lgr5, by the expression of liver progenitor and duct markers, and by low expression of hepatocyte markers, oval cell markers, and stellate cell markers. Prolonged cultures of rat liver organoids depended on high levels of WNT-signalling and the inhibition of BMP-signaling. Upon transplantation of clonal lines to a Fah(-/-) Il2rg(-/-) rat model of liver failure, the rat liver stem cells engrafted into the host liver where they differentiated into areas with FAH and Albumin positive hepatocytes. Rat liver stem cell lines hold potential as consistent reliable cell sources for pharmacological, toxicological or metabolic studies. In addition, rat liver stem cell lines may contribute to the development of regenerative medicine in liver disease. To our knowledge, the here described liver stem cell lines represent the first organoid culture system in the rat.

  4. In vitro characterization of borneol metabolites by GC-MS upon incubation with rat liver microsomes.

    Science.gov (United States)

    Zhang, Rong; Liu, Chang-hui; Huang, Tian-lai; Wang, Ning-sheng; Mi, Sui-qing

    2008-01-01

    The metabolism of borneol is studied by the analysis of incubations of in vitro-prepared rat liver microsomes. A sensitive gas chromatography (GC)-mass spectrometry (MS) method is developed for the identification of borneol and its metabolites. Four novel metabolites, which have not previously been reported, are isolated and confirmed by comparison of the GC-MS method. The biotransformation pathway of borneol in rat liver microsomes is proposed based on the in vitro results.

  5. Coenzyme metabolism in rat liver transketolase

    Energy Technology Data Exchange (ETDEWEB)

    Gorbach, Z.V.; Kubyshin, V.L.; Maglysh, S.S.; Zabrodskaya, S.V.

    1987-01-10

    On the basis of the results of kinetic investigations, two binding sites for hydroxythiamine diphosphate were determined in apotransketolase, with sharply differing values of K/sub i/: (7-22) x 10/sup -9/ and (13.0-19.7) x 10/sup -8/ M. A study was made of the turnover rate of thiamine diphosphate in holotransketolase in rat liver tissue by a radioisotope method, using (/sup 14/C) thiamine as the labeled precursor. The half-substitution time and rate constant of degradation of the coenzyme in transketolase are close in absolute values to the analogous indices for the protein portion of the enzyme and constitute 153 h and 0.108 day/sup -1/, respectively. Rat liver transketolase exists in vivo in the form of a substituted ..cap alpha..-carbanion. Replacement of thiamine diphosphate by hydroxythiamine diphosphate in the holoenzyme has no effect on the formation of the intermediate ..cap alpha..-carbanion form of the enzyme.

  6. Heterotrimeric G protein subunits are located on rat liver endosomes

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    Van Dyke Rebecca W

    2004-01-01

    Full Text Available Abstract Background Rat liver endosomes contain activated insulin receptors and downstream signal transduction molecules. We undertook these studies to determine whether endosomes also contain heterotrimeric G proteins that may be involved in signal transduction from G protein-coupled receptors. Results By Western blotting Gsα, Giα1,2, Giα3 and Gβ were enriched in both canalicular (CM and basolateral (BLM membranes but also readily detectable on three types of purified rat liver endosomes in the order recycling receptor compartment (RRC > compartment for uncoupling of receptor and ligand (CURL > multivesicular bodies (MVB >> purified secondary lysosomes. Western blotting with antibodies to Na, K-ATPase and to other proteins associated with plasma membranes and intracellular organelles indicated this was not due to contamination of endosome preparations by CM or BLM. Adenylate cyclase (AC was also identified on purified CM, BLM, RRC, CURL and MVB. Percoll gradient fractionation of liver postnuclear supernatants demonstrated co-occurrence of endosomes and heterotrimeric G protein subunits in fractions with little plasma membrane markers. By confocal microscopy, punctate staining for Gsα, Giα3 and Gβ corresponded to punctate areas of endocytosed Texas red-dextran in hepatocytes from control and cholera toxin-treated livers. Conclusion We conclude that heterotrimeric G protein subunits as well as AC likely traffic into hepatocytes on endosome membranes, possibly generating downstream signals spatially separate from signalling generated at the plasma membrane, analogous to the role(s of internalized insulin receptors.

  7. Toxicogenomics of resveratrol in rat liver.

    Science.gov (United States)

    Hebbar, Vidya; Shen, Guoxiang; Hu, Rong; Kim, Bok-Ryang; Chen, Chi; Korytko, Peter J; Crowell, James A; Levine, Barry S; Kong, A-N Tony

    2005-04-01

    Resveratrol, a polyphenolic compound found in grape skin and peanuts has been shown to prevent many diseases including cardiovascular diseases and cancer. To better understand resveratrol's potential in vivo toxicity, we studied the dose response using cDNA stress arrays coupled with drug metabolizing enzymatic (DME) assays to investigate the expression of stress-responsive genes and Phase I and II detoxifying enzymes in rat livers. Male and female CD rats were treated with high doses of resveratrol (0.3, 1.0 and 3.0 gm/kg/day) for a period of 28 days. Total RNA from rat liver was reverse-transcribed using gene-specific primers and hybridized to stress-related cDNA arrays. Among female rats, Phase I DME genes were repressed at 0.3 and 1.0 gm/kg/day doses, while genes such as manganese superoxide dismutase, cytochrome P450 reductase, quinone oxidoreductase and thiosulfate sulfurtransferase demonstrated a dose-dependent increase in gene expression. The modulation of these liver genes may implicate the potential toxicity as observed among the rats at the highest dose level of resveratrol. Real-Time PCR was conducted on some of the Phase II DME genes and anti-oxidant genes to validate the cDNA array data. The gene expression from real-time PCR demonstrated good correlation with the cDNA array data. UGT1A genes were amongst the most robustly induced especially at the high doses of resveratrol. We next performed Phase I and Phase II enzymatic assays on cytochrome P450 2E1 (CYP2E1), cytochrome P450 1A1 (CYP1A1), NAD(P)H:quinone oxidoreductase (NQO1), glutathione S-transferase (GST) and UDP-glucuronosyl transferase (UGT). Induction of Phase II detoxifying enzymes was most pronounced at the highest dose of resveratrol. CYP1A1 activity demonstrated a decreasing trend among the 3 dose groups and CYP2E1 activity increased marginally among female rats over controls. In summary, at lower doses of resveratrol there are few significant changes in gene expression whereas the

  8. Isolation and catalytic competence of different animal liver microsomal fractions prepared by calcium-aggregation method

    Directory of Open Access Journals (Sweden)

    Walawalkar Pradnya

    2006-01-01

    Full Text Available Rat, mouse, rabbit, and guinea pig liver microsomes were prepared, using the calcium-aggregation method. The mean specific spectral cytochrome P450 content obtained for rat, mouse, rabbit, and guinea pig liver microsomes were 0.547, 0.394, 0.677, and 0.378 nmol cytochrome P450/mg protein, respectively. All the microsomal samples showed the ability to biotransform p-nitrophenol to p-nitrocatechol. The mean rate of formation of p-nitrocatechol by rat, mouse, rabbit, and guinea pig liver microsomes was 0.272, 0.247, 0.497 and 0.424 nmole/min/nmole cytochrome 450, respectively. This method circumvents the need of an ultracentrifuge for isolation of microsomes, by the conventional differential centrifugation method.

  9. Rat liver metabolism of dicarboxylic acids.

    Science.gov (United States)

    Vamecq, J; Draye, J P; Brison, J

    1989-04-01

    Recently, we demonstrated in rat liver that dicarboxylic acids containing more than five carbons can be activated by a microsomal dicarboxylyl-CoA synthetase (J. Vamecq, E. de Hoffmann, and F. Van Hoof. Biochem. J. 230: 683-693, 1985). The products of this reaction, dicarboxylyl-CoA esters, were found to be substrates for an H2O2-generating dicarboxylyl-CoA oxidase. In the present work we report that 1) the catalytic center or the essential domains of dicarboxylyl-CoA synthetase are located at the cytosolic aspect of the endoplasmic reticulum membrane; 2) dicarboxylyl-CoA oxidase is optimally active on dodecanedioyl-CoA and is a peroxisomal enzyme; 3) cyanide-insensitive dodecanedioyl-CoA oxidation (NADH production) is catalyzed by rat liver homogenates. Cell fractionation studies disclose that, similar to dodecanedioyl-CoA oxidase (H2O2 production), the cyanide-insensitive dodecanedioyl-CoA oxidizing activity also belongs to peroxisomes; 4) a dodecanedioyl-CoA oxidoreductase reaction can be assayed by the dichlorphenolindophenol procedure in rat liver homogenates, and the activity is abundant in peroxisomal, mitochondrial, and soluble fractions; 5) by contrast with monocarboxylyl-CoA esters, the dicarboxylyl-CoAs are apparently not substrates for mitochondrial fatty acid oxidation; however, the use of dicarboxylylcarnitine esters as direct substrate for mitochondria suggests the existence of an active beta-oxidation of dicarboxylates in these organelles, which is further confirmed by experiments in which mitochondria are permeabilized with digitonin; 6) the in vivo oxidation of infused dodecanedioic acid results in a rapid appearance in urine of medium-chain dicarboxylic acids, with only 30-50% of the infused dose recovered in urine.

  10. Donor liver natural killer cells alleviate liver allograft acute rejection in rats

    Institute of Scientific and Technical Information of China (English)

    Jian-Dong Yu; Tian-Zhu Long; Guo-Lin Li; Li-Hong Lv; Hao-Ming Lin; Yong-Heng Huang; Ya-Jin Chen; Yun-Le Wan

    2011-01-01

    BACKGROUND: Liver enriched natural killer (NK) cells are of high immune activity. However, the function of donor liver NK cells in allogeneic liver transplantation (LTx) remains unclear. METHODS: Ten Gy of whole body gamma-irradiation (WBI) from a 60Co source at 0.6 Gy/min was used for depleting donor-derived leukocytes, and transfusion of purified liver NK cells isolated from the same type rat as donor (donor type liver NK cells, dtlNKs) through portal vein was performed immediately after grafting the irradiated liver. Post-transplant survival observation on recipients and histopathological detection of liver grafts were adoptive to evaluate the biological impact of donor liver NK cells on recipients' survival in rat LTx. RESULTS: Transfusion of dtlNKs did not shorten the survival time among the recipients of spontaneous tolerance model (BN to LEW rat) after rat LTx, but prolonged the liver graft survival among the recipients depleted of donor-derived leukocytes in the acute rejection model (LEW to BN rat). Compared to the recipients in the groups which received the graft depleted of donor-derived leukocytes, better survival and less damage in the allografts were also found among the recipients in the two different strain combinations of liver allograft due to transfusion of dtlNKs. CONCLUSIONS: Donor liver NK cells alone do not exacerbate liver allograft acute rejection. Conversely, they can alleviate it, and improve the recipients' survival.

  11. Using ultrasound Nakagami imaging to assess liver fibrosis in rats.

    Science.gov (United States)

    Ho, Ming-Chih; Lin, Jen-Jen; Shu, Yu-Chen; Chen, Chiung-Nien; Chang, King-Jen; Chang, Chien-Cheng; Tsui, Po-Hsiang

    2012-02-01

    This study explored the feasibility of using the ultrasound Nakagami image to assess the degree of liver fibrosis in rats. The rat has been widely used as a model in investigations of liver fibrosis. Ultrasound grayscale imaging makes it possible to observe fibrotic rat livers in real time. Statistical analysis of the envelopes of signals backscattered from rat livers may provide useful clues about the degree of liver fibrosis. The Nakagami-model-based image has been shown to be useful for characterizing scatterers in tissues by reflecting the echo statistics, and hence the Nakagami image may serve as a functional imaging tool for quantifying rat liver fibrosis. To validate this idea, fibrosis was induced in each rat liver (n=21) by an intraperitoneal injection of 0.5% dimethylnitrosamine. Livers were excised from rats for in vitro ultrasound scanning using a single-element transducer. The backscattered-signal envelopes of the acquired raw ultrasound signals were used for Nakagami imaging. The Metavir score determined by a pathologist was used to histologically quantify the degree of liver fibrosis. It was found that the Nakagami image could be used to distinguish different degrees of liver fibrosis in rats, since the average Nakagami parameter increased from 0.55 to 0.83 as the fibrosis score increased from 0 (i.e., normal) to 4. This correlation may be due to liver fibrosis in rats involving an increase in the concentration of local scatterers and the appearance of the periodic structures or clustering of scatterers that would change the backscattering statistics. The current findings indicate that the ultrasound Nakagami image has great potential as a functional imaging tool to complement the use of the conventional B-scan in animal studies of liver fibrosis.

  12. Single liver lobe repopulation with wildtype hepatocytes using regional hepatic irradiation cures jaundice in Gunn rats.

    Directory of Open Access Journals (Sweden)

    Hongchao Zhou

    Full Text Available BACKGROUND AND AIMS: Preparative hepatic irradiation (HIR, together with mitotic stimulation of hepatocytes, permits extensive hepatic repopulation by transplanted hepatocytes in rats and mice. However, whole liver HIR is associated with radiation-induced liver disease (RILD, which limits its potential therapeutic application. In clinical experience, restricting HIR to a fraction of the liver reduces the susceptibility to RILD. Here we test the hypothesis that repopulation of selected liver lobes by regional HIR should be sufficient to correct some inherited metabolic disorders. METHODS: Hepatocytes (10(7 isolated from wildtype F344 rats or Wistar-RHA rats were engrafted into the livers of congeneic dipeptidylpeptidase IV deficient (DPPIV(- rats or uridinediphosphoglucuronateglucuronosyltransferase-1A1-deficient jaundiced Gunn rats respectively by intrasplenic injection 24 hr after HIR (50 Gy targeted to the median lobe, or median plus left liver lobes. An adenovector expressing hepatocyte growth factor (10(11 particles was injected intravenously 24 hr after transplantation. RESULTS: Three months after hepatocyte transplantation in DPPIV(- rats, 30-60% of the recipient hepatocytes were replaced by donor cells in the irradiated lobe, but not in the nonirradiated lobes. In Gunn rats receiving median lobe HIR, serum bilirubin declined from pretreatment levels of 5.17 ± 0.78 mg/dl to 0.96 ± 0.30 mg/dl in 8 weeks and remained at this level throughout the 16 week observation period. A similar effect was observed in the group, receiving median plus left lobe irradiation. CONCLUSIONS: As little as 20% repopulation of 30% of the liver volume was sufficient to correct hyperbilirubinemia in Gunn rats, highlighting the potential of regiospecific HIR in hepatocyte transplantation-based therapy of inherited metabolic liver diseases.

  13. Dinucleosidasetetraphosphatase in rat liver and Artemia salina.

    Science.gov (United States)

    Vallejo, C G; Lobaton, C D; Quintanilla, M; Sillero, A; Sillero, M A

    1976-06-07

    A comparative study of an enzymatic activity present in Artemia salina and rat liver which specifically splits dinucleoside tetraphosphates is presented. All the purine and pyrimidine dinucleoside tetraphosphates tested, i.e. diadenosine, diguanosine, dixanthosine and diuridine tetraphosphates, were substrates of both enzymes with similar maximum velocities and Km values, (around 10 muM). The inhibition by nucleotides of the enzyme from the two sources is also similar. Particularly relevant is the strong inhibition caused by nucleoside tetraphosphates which have Ki values in the nanomolar range. The Artemia enzyme has a slightly lower molecular weight (17 500) than the liver enzyme (21 000) and is more resistant to acidic pH. Based on previous findings, the enzyme from Artemia salina was named diguanosinetetraphosphatase (EC 3.6.1.17) by the Enzyme Commission. The results presented in this paper show that the liver and Artemia enzymes are similar, and we propose to name this enzyme as dinucleosidetetraphosphatase or dinucleoside-tetraphosphate nucleotidehydrolase.

  14. Potential neoplastic effects of parathion-methyl on rat liver

    Institute of Scientific and Technical Information of China (English)

    M. Nisa UNALDI CORAL; Sonay UCMAN; Hasan YILDIZ; Haydar OZTAS; Semih DALKILIC

    2009-01-01

    The mutagenic and carcinogenic effects of parathion-methyl were examined by bacterial reverse assay and a long term experiment with Wistar rats. The potential mutagenic effect of parathion-methyl in Salmonella typhimurium TA100 bacterial cells was observed without rat liver S9 metabolic activation. Parathion-methyl was further investigated for pathological changes in rat pancreas and liver. The long-term rat experiments showed that parathion-methyl exposure for 3 months can cause pathological changes in rat pancreases acinar cells and pancreatic hepatocytes. Atypical acinar cell focuses (AACF) were determined in the liver and pancreas of the rats. The results from short-term Ames test and long-term rat experiments suggest that parathion-methyl would be potential carcinogenic.

  15. Role of rat liver cytochrome P450 3A and 2D in metabolism of imrecoxib

    Institute of Scientific and Technical Information of China (English)

    Hai-yan XU; Zhi-yong XIE; Peng ZHANG; Jin SUN; Feng-ming CHU; Zong-ru GUO; Da-fang ZHONG

    2006-01-01

    Aim: To investigate the in vitro metabolism of imrecoxib in rat liver microsomes and to identify the cytochrome P450 (CYP) forms involved in its metabolism. Methods: Liver microsomes of Wistar rats were prepared using an ultracentrifuge. The in vitro metabolism of imrecoxib was studied by incubation with rat liver microsomes. To characterize the CYP forms involved in the 4'-methyl hydroxylation of imrecoxib, the effects of typical CYP inducers (such as dexamethasone, isoniazid and (3-naphthoflavone) and of CYP inhibitors (such as ketoconazole, quinine, a-naphthoflavone, methylpyrazole, and cimetidine) on the formation rate of 4'-hydroxymethyl imrecoxib were investigated. Results: Imrecoxib wasmetabolized to 3 metabolites by rat liver microsomes: 4'-hydroxymethyl imrecoxib (M4), 4'-hydroxymethyl-5-hydoxyl imrecoxib (M3), and 4'-hydroxymethyl-5-carbonyl imrecoxib (M5). Over the imrecoxib concentration range studied (5-600 umol/L), the rate of 4'-methyl hydroxylation conformed to monophasic Michaelis-Menten kinetics. Dexamethasone significantly induced the formation of M4. Ketoconazole markedly lowered the metabolic rate of imrecoxib in a concentration-dependent manner. Moreover, a significant inhibitory effect of quinine on the formation of M4 was observed in microsomes obtained from control rats, isoniazid-induced rats, and (3-naphthoflavone-induced rats. In contrast, α-naphthoflavone, cimetidine, and methylpyrazole had no inhibitory effects on this metabolic pathway. Conclusion: Imrecoxib is metabolized via 4'-methyl hydroxylation in rat liver microsomes. The reaction is mainly catalyzed by CYP 3A. CYP 2D also played a role in control rats, in isoniazid-induced rats and in β-naphthoflavone-induced rats.

  16. Kavalactone metabolism in rat liver microsomes.

    Science.gov (United States)

    Fu, Shuang; Rowe, Anthony; Ramzan, Iqbal

    2012-07-01

    The specific CYP enzymes involved in kavalactone (KLT) metabolism and their kinetics have not been fully examined. This study used rat liver microsomes (RLM) to determine kavain (KA), methysticin (MTS) and desmethoxyyangonin (DMY) enzyme kinetic parameters, to elucidate the major CYP450 isoforms involved in KLT metabolism and to examine gender differences in KLT metabolism. Formation of the major KLT metabolites was first-order, consistent with classic enzyme kinetics. In both male and female RLM, clotrimazole (CLO) was the most potent inhibitor of KA and MTS metabolism. This suggests CYP3A1/3A23 (females) and CYP3A2 (males) are the main isoenzymes involved in the metabolism of these KLTs in rats, while the roles of CYP1A2, -2 C6, -2 C9, -2E1 and -3A4 are limited. Desmethoxyyangonin metabolism was equally inhibited by cimetidine (CIM) and CLO in females, and CIM and nortriptyline in males. This implies that DMY metabolism involves CYP2C6 and CYP2C11 in males, and CPY2C12 in females. CYP3A1/3A23 may also be involved in females.

  17. Hydroxylation of pentamidine by rat liver microsomes.

    Science.gov (United States)

    Berger, B J; Reddy, V V; Le, S T; Lombardy, R J; Hall, J E; Tidwell, R R

    1991-03-01

    The antiprotozoal/antifungal drug pentamidine [1,5-bis(4-amidinophenoxy)pentane] has been recently shown to be metabolized by rat liver fractions to at least six putative metabolites as detected by high-performance liquid chromatography. Two minor metabolites have been previously identified as N-hydroxypentamidine and N,N'-dihydroxypentamidine. In this study, the two major microsomal metabolites have been identified as the 2-pentanol and 3-pentanol analogs of pentamidine [1,5-di(4-amidinophenoxy)-2-pentanol; and 1,5-bis(4-amidinophenoxy)-3-pentanol]. As well, a seventh putative metabolite has been discovered and identified as para-hydroxybenzamidine, a fragment of the original drug. Whereas the cytochromes P-450 have been demonstrated as the enzyme system responsible for pentamidine metabolism, hydroxylation of the drug was not inducible by phenobarbital, beta-naphthoflavone, clofibrate, isosafrole, pregnenolone-16 alpha-carbonitrile, ethanol or pentamidine pretreatment of rats. The kinetics of the production of the two major microsomal metabolites has been determined as Km = 56 +/- 19 microM and Vmax = 126 +/- 21 pmol/min/mg microsomal protein for the 2-pentanol analog, and Km = 28 +/- 0.28 microM and Vmax = 195 +/- 2.4 pmol/min/mg microsomal protein for the 3-pentanol analog. Therefore, the mixed-function oxidases readily convert pentamidine to hydroxylated metabolites, but exactly which isozyme(s) of cytochrome P-450 is responsible is not clear.

  18. Antitumor activity of two gelsemine metabolites in rat liver microsomes.

    Science.gov (United States)

    Zhao, Qing-Chun; Hua, Wei; Zhang, Lin; Guo, Tao; Zhao, Ming-Hong; Yan, Ming; Shi, Guo-Bing; Wu, Li-Jun

    2010-09-01

    Gelsemine is one of the major alkaloids from Gelsemium elegans Benth., which has been used as an antitumor remedy in clinic. In this paper, metabolism of gelsemine has been investigated in vitro in phenobarbital-treated rat liver microsomes. The metabolites of gelsemine were separated and evaluated using the flash silica gel column, preparative HPLC, using NMR and MS methods. According to the spectral data, two metabolites, M1 and M2, were identified as 4-N-demethylgelsemine and 21-oxogelsemine, respectively. By the MTT method in vitro, the antitumor activities between gelsemine and its metabolites were compared in the HepG2 and HeLa cell lines. Moreover, the main metabolic pathway was further proposed.

  19. The effects of aqueous extracts prepared from the leaves of Pistacia lentiscus in experimental liver disease.

    Science.gov (United States)

    Ljubuncic, Predrag; Song, Hui; Cogan, Uri; Azaizeh, Hassan; Bomzon, Arieh

    2005-08-22

    In a previous study, we identified Pistacia lentiscus was worthy for further laboratory evaluation because an aqueous extract of the plant suppressed iron-induced lipid peroxidation in rat liver homogenates without affecting mitochondrial respiration in cultured HepG2 and PC12 cells. The present study was undertaken to evaluate the efficacy of an aqueous extract prepared from the dried leaves of Pistacia lentiscus in a rat model of hepatic injury caused by the hepatotoxin, thioacetamide. We assessed the impact of daily dosing on biochemical and morphological indices and the extent of oxidative stress in the livers of healthy and thioacetamide-treated rats. In healthy rats, long-term administration of the extract induced hepatic fibrosis and an inflammatory response, mild cholestasis and depletion of reduced glutathione associated with an increase in its oxidized form. In thioacetamide-treated rats, long-term administration of extract aggravated the inflammatory and fibrotic and glutathione depleting responses without affecting the extent of lipid peroxidation. Although our previous in vitro study established that extracts prepared from the leaves of Pistacia lentiscus had antioxidant activity, this in vivo study establishes these extracts also contains hepatotoxins whose identity may be quite different from those compounds with antioxidant properties. The results of this study suggest complementing in vitro experiments with those involving animals are essential steps in establishing the safety of medicinal plants. Furthermore, these data confirm that complete reliance on data obtained using in vitro methodologies may lead to erroneous conclusions pertaining to the safety of phytopharmaceuticals.

  20. Data on body weight and liver functionality in aged rats fed an enriched strawberry diet

    Directory of Open Access Journals (Sweden)

    Francesca Giampieri

    2017-08-01

    Full Text Available Here, we present new original data on the effects of strawberry consumption on body weight and liver status of aged rats. Wistar rats aged 19–21 months were fed a strawberry enriched diet prepared by substituting 15% of the total calories with freeze-dried strawberry powder for two months. Body weight, plasma biomarkers of liver injury (alanine transferase, aspartate aminotransferase and alkaline phosphatase and liver histological analysis were assessed. These data indicate that strawberry supplementation did not interfere with normal animal maintenance and with liver structure and functionality. For further details and experimental findings please refer to the article “Strawberry consumption improves aging-associated impairments, mitochondrial biogenesis and functionality through the AMP-Activated Protein Kinase signaling cascade” in FOOD CHEMISTRY (Giampieri et al., 2017 [1].

  1. Kinetics of lactate transport into rat liver in vivo

    Energy Technology Data Exchange (ETDEWEB)

    Lupo, M.A.; Cefalu, W.T.; Pardridge, W.M.

    1990-04-01

    Lactate clearance by liver plays an important role in lactate homeostasis and in the development of lactic acidosis. The role of lactate delivery to liver as a limiting factor in hepatic uptake of lactate is unclear. Lactate delivery of mechanisms could be important if rates of lactate transport approximate rates of lactate metabolism by liver. The rates of lactate transport into liver have been determined in vitro with isolated liver cells and the results have been conflicting. Therefore, the present studies measure the rate of transport of (14C)-L-lactate, and its poorly metabolizeable stereoisomer, (14C)-D-lactate, into rat liver in vivo using a portal vein injection technique. The transport of (3H)-water and of (14C)-sucrose, an extracellular reference compound, were also studied. Portal blood flow was determined from the kinetics of (3H)-water efflux in liver and was 1.93 +/- 0.22 mL/min/g. The volumes of distribution of (14C)-L-lactate, and (14C)-sucrose were 1.31 +/- 0.22, 0.71 +/- 0.07, and 0.22 +/- 0.07 mL/g, respectively. The extraction of unidirectional influx of (14C)-L-lactate and (14C)-D-lactate by rat liver was 93% +/- 10% and 91% +/- 9%, respectively. The rate of lactate transport into rat liver in vivo, 1.8 mumols.min-1.g-1, is approximately twofold greater than the rate of lactate metabolism by rat liver reported in the literature. Therefore, lactate uptake by liver may not be limited by transport under normal conditions. However, conditions such as decreased portal blood flow, which slow lactate delivery to liver by 50% or more, could cause lactate uptake by liver to be limited by transport of circulating lactate.

  2. Chronic stress does not impair liver regeneration in rats

    DEFF Research Database (Denmark)

    Andersen, Kasper J; Knudsen, Anders Riegels; Wiborg, Ove;

    2015-01-01

    a 70 % partial hepatectomy (PHx). The animals were evaluated on postoperative day 2 or 4. Blood samples were collected to examine circulating markers of inflammation and liver cell damage. Additionally, liver tissues were sampled to evaluate liver weight and regeneration rate. RESULTS: None......BACKGROUND: Although wound healing is a simple regenerative process that is critical after surgery, it has been shown to be impaired under psychological stress. The liver has a unique capacity to regenerate through highly complex mechanisms. The aim of this study was to investigate the effects...... of chronic stress, which may induce a depression-like state, on the complex process of liver regeneration in rats. METHODS: Twenty rats were included in this study. The animals received either a standard housing protocol or were subjected to a Chronic Mild Stress (CMS) stress paradigm. All rats underwent...

  3. Liver function of Streptozotocin- Induced Diabetic Rats Orally ...

    African Journals Online (AJOL)

    phytochemicals (especially saponins), carbohydrate and food energy ... The role of the liver in metabolism, including detoxification ... in lipid metabolism and increased gluconeogenesis and ..... Hypoglycemic Activities in Rats and Rabbits.

  4. Decrease in Activities of Selected Rat Liver Enzymes following ...

    African Journals Online (AJOL)

    Journal of Applied Sciences and Environmental Management ... The effects of the chemical effluent from Soap and Detergent Industry on some rat liver ... Chemical analyses of both the effluent and tap water which served as the control were ...

  5. Evaluation of methylmercury biotransformation using rat liver slices

    Energy Technology Data Exchange (ETDEWEB)

    Yasutake, A. [Biochemistry Section, National Inst. for Minamata Disease, Minamata, Kumamoto (Japan); Hirayama, K. [Kumamoto University College of Medical Science, Kuhonji (Japan)

    2001-09-01

    To examine the demethylation reaction of methylmercury (MeHg) in rat liver, slices prepared from MeHg-treated rats were incubated in L-15 medium under 95% O{sub 2}/5% CO{sub 2} atmosphere. During the incubation, the amount of inorganic Hg in the slices markedly increased in a time-dependent manner, although the concentration of total Hg remained unchanged. Since the C-Hg bond in MeHg was demonstrated to be cleaved by the action of some reactive oxygen species, the effects on MeHg demethylation of several reagents that could modify reactive oxygen production were examined in the present system. Methylviologen was found to be an effective enhancer of the demethylation reaction with only a minor effect on lipid peroxidation. On the other hand, ferrous ion added to the medium showed no effect on demethylation in the presence or absence of methylviologen, although lipid peroxide levels were increased significantly by ferrous ion. Similarly, deferoxamine mesylate, which effectively suppressed the increase in lipid peroxide levels, also had no effect on demethylation. Furthermore, hydroxy radical scavengers, such as mannitol and dimethylsulfoxide, had no effect on inorganic Hg production. Rotenone, an inhibitor of complex I in the mitochondrial electron transport system, increased levels of both inorganic Hg and lipid peroxide. However, other inhibitors, such as antimycin A, myxothiazole and NaCN, significantly suppressed the demethylation reaction. Cell fractionation of the MeHg-treated rat liver revealed that the ratio of inorganic Hg to total Hg was highest in the mitochondrial fraction. Furthermore, superoxide anion could degrade MeHg in an organic solvent but not in water. These results suggested that the demethylation of MeHg by the liver slice would proceed with the aid of superoxide anion produced in the electron transfer system at the hydrophobic mitochondrial inner membrane. Furthermore, the involvement of hydroxy radicals, which have been demonstrated to be

  6. Enantioselective Metabolism of Flufiprole in Rat and Human Liver Microsomes.

    Science.gov (United States)

    Lin, Chunmian; Miao, Yelong; Qian, Mingrong; Wang, Qiang; Zhang, Hu

    2016-03-23

    The enantioselective metabolism of flufiprole in rat and human liver microsomes in vitro was investigated in this study. The separation and determination were performed using a liquid chromatography system equipped with a triple-quadrupole mass spectrometer and a Lux Cellulose-2 chiral column. The enantioselective metabolism of rac-flufiprole was dramatically different in rat and human liver microsomes in the presence of the β-nicotinamide adenine dinucleotide phosphate regenerating system. The half-lives (t1/2) of flufiprole in rat and human liver microsomes were 7.22 and 21.00 min, respectively, for R-(+)-flufiprole, whereas the values were 11.75 and 17.75 min, respectively, for S-(-)-flufiprole. In addition, the Vmax of R-(+)-flufiprole was about 3-fold that of S-(-)-flufiprole in rat liver microsomes, whereas its value in the case of S-(-)-flufiprole was about 2-fold that of R-(+)-flufiprole in human liver microsomes. The CLint of rac-flufiprole also showed opposite enantioselectivy in rat and human liver microsomes. The different compositions and contents of metabolizing enzyme in the two liver microsomes might be the reasons for the difference in the metabolic behavior of the two enantiomers.

  7. Interaction of low density lipoproteins with rat liver cells

    NARCIS (Netherlands)

    L. Harkes (Leendert)

    1985-01-01

    textabstractThe most marked conclusion is the establishment of the important role of non-parenchymal cells in the catabolism of the low density lipoproteins by the rat liver. Because the liver is responsible for 70-80% of the removal of LDL from blood this conclusion can be extended to total LDL tur

  8. EFFECT OF ETHANOL ON HEPATOBILIARY TRANSPORT OF CATIONIC DRUGS - A STUDY IN THE ISOLATED-PERFUSED RAT-LIVER, RAT HEPATOCYTES AND RAT MITOCHONDRIA

    NARCIS (Netherlands)

    STEEN, H; MEIJER, DKF; Merema, M.T.

    1994-01-01

    The effect of ethanol on the hepatic uptake of various cationic drugs was studied in isolated perfused rat livers, isolated rat hepatocytes and isolated rat liver mitochondria. In isolated rat hepatocytes and in isolated perfused rat livers, the uptake of the model organic cation tri-n-butylmethylam

  9. [Orthotopic liver transplant in rats. Surgical technique, complications and treatment].

    Science.gov (United States)

    Lausada, Natalia R; Gondolesi, G E; Ortiz, E; Dreizzen, E; Raimondi, J C

    2002-01-01

    The orthotopic rat liver transplant model is a widely used technique in transplantation research. It has many advantages over other animal transplant models because of its availability and low cost. However, it must be emphasized that success with the rat model requires thorough training. The aim of this paper is to describe the microsurgical technique involved in 60 rat liver transplants and to discuss the complications and their treatments. Forty-nine liver transplants were performed at the Experimental Laboratory of the University Hospital, Ontario, Canada (ELUH) and 11 were performed at the Laboratorio de Trasplante de Organos de la Facultad de Ciencias Médicas de La Plata, Buenos Aires. Argentina (LTO). Among the transplants performed at the ELUH, the observed complications were haemorrhage (n = 4), pneumothorax (n = 1), anastomotic failure (n = 15), bile leak (n = 3), and bile duct necrosis (n = 9). The remaining 17 rats at the ELUH were healthy at day 7 after surgery. Animal survival immediately postop, at 24 hours postop and at 7 days postop was achieved with the 9th, 20th and 21st transplants respectively. At the LTO, 3 rats died as a result of anaesthetic complications. Seven-day animal survival was achieved with the 11th transplant. We beleive that the description of the orthotopic rat liver transplantation technique, as well as the discussion regarding complications and their management, can be useful for researchers interested in performing liver transplantation in rats.

  10. TUMORICIDAL RESPONSE OF LIVER MACROPHAGES ISOLATED FROM RATS BEARING LIVER METASTASES OF COLON ADENOCARCINOMA

    NARCIS (Netherlands)

    THOMAS, C; NIJENHUIS, AM; DONTJE, B; DAEMEN, T; SCHERPHOF, GL

    1995-01-01

    Intraportal inoculation of CC531 adenocarcinoma cells into syngeneic rats causes an increase of liver macrophage cell number but not of major histocompatibility complex class II antigen expression. On day I after inoculation of 10(5) CC531 cells, a fixed number of isolated liver macrophages lysed si

  11. Gel-based proteomics of liver cancer progression in rat

    DEFF Research Database (Denmark)

    Albrethsen, Jakob; Miller, Leah M; Novikoff, Phyllis M

    2011-01-01

    carcinoma (HCC) and we identify novel candidate proteomic aberrations for further analysis in human HCC. In particular, increased levels of HSP70, HSP90, AKR1B1, AKR7A3, GCLM, ANXA5, VDBP, RGN and SULT1E1 were associated specifically with rat hepatomas, or with liver cancer progression in rat. In addition...

  12. [Lipogenesis and gluconeogenesis in the liver of irradiated rats].

    Science.gov (United States)

    Sedlakova, A; Paulikova, E; Diatelinka, I

    1984-01-01

    The incorporation of 14C from [U-14C] glucose and 3H from 3H2O into the total lipids fatty acids and glycogen of the liver incorporation of 3H from 3H2O into blood glucose was studied in rats totally irradiated in a dose of 14.4 Gy. It is shown that in the liver of irradiated rats glucose is accumulated in considerable amounts as glycogen but it is slightly used as a source of carbon for lipid synthesis. The study of 3H incorporation shows that irradiation stimulates glucogenesis, glyconeogenesis and lipogenesis in the liver.

  13. The effect of avocado oils on some liver characteristics in growing rats.

    Science.gov (United States)

    Werman, M J; Mokady, S; Neeman, I; Auslaender, L; Zeidler, A

    1989-05-01

    The effects of various avocado oils on some liver characteristics were studied in growing rats. The rats were fed diets containing 10% (w/w) avocado oil for 4 wk. In comparison with rats fed refined oil obtained from cored fruit by centrifugal separation, rats fed unrefined avocado oil obtained by solvent extraction from the intact fruit, or refined avocado oil containing avocado-seed oil, showed significant growth inhibition, an increase in the amount of hepatic lipids (identified as steatosis by histopathological examination), and a decrease in levels of triglycerides in blood. Rats fed the refined oil containing unsaponifiable material prepared from unrefined oil from the intact fruit showed similar responses. Fatty livers were not induced by feeding rats unrefined avocado oil obtained from intact fruit by centrifugal separation, although a significant decrease in blood triglycerides was observed. There were no significant differences between groups in serum total protein, albumin or bilirubin content or in alanine aminotransferase activity. However, serum alkaline phosphatase activity was increased in rats fed the seed oil, the unrefined solvent-extracted oil from intact fruit, or the unsaponifiables, and aspartate aminotransferase activity was significantly increased in the group fed avocado-seed oil. These data suggest that consumption of avocado oil extracted from intact fruit may cause changes in liver metabolism.

  14. Intestinal microflora in rats with ischemia/reperfusion liver injury

    Institute of Scientific and Technical Information of China (English)

    XING Hui-chun; LI Lan-juan; XU Kai-jin; SHEN Tian; CHEN Yun-bo; SHENG Ji-fang; YU Yun-song; CHEN Ya-gang

    2005-01-01

    Objectives: To investigate the intestinal microflora status related to ischemia/reperfusion (I/R) liver injury and explore the possible mechanism. Methods: Specific pathogen free grade Sprague-Dawley rats were randomized into three groups: Control group (n=8), sham group (n=6) and I/R group (n=10). Rats in the control group did not receive any treatment, rats in the I/R group were subjected to 20 min of liver ischemia, and rats in the sham group were only subjected to sham operation. Twenty-two hours later, the rats were sacrificed and liver enzymes and malondialdehyde (MDA), superoxide dismutase (SOD), serum endotoxin,intestinal bacterial counts, intestinal mucosal histology, bacterial translocation to mesenteric lymph nodes, liver, spleen, and kidney were studied. Results: Ischemia/reperfusion increased liver enzymes, MDA, decreased SOD, and was associated with plasma endotoxin elevation in the I/R group campared to those in the sham group. Intestinal Bifidobacteria and Lactobacilli decreased and intestinal Enterobacterium and Enterococcus, bacterial translocation to kidney increased in the I/R group compared to the sham group. Intestinal microvilli were lost, disrupted and the interspace between cells became wider in the I/R group.Conclusion: I/R liver injury may lead to disturbance of intestinal microflora and impairment of intestinal mucosal barrier function,which contributes to endotoxemia and bacterial translocation to kidney.

  15. In Vitro transformation of LW13 Rat liver epithelial Cells

    Institute of Scientific and Technical Information of China (English)

    SHICAN; KARLFETNANSKY; 等

    1992-01-01

    A rat liver epithelial cell line designated LW 13 was established using a sequential sedimentation method.The cell line retained many normal proerties of liver epithelial cells and showed some structural and functional features resembling those of liver parenchymal cells,LW13 cells became malignant after the intrduction of exogenous transforming EJ Ha ras gene,Tumors produced by inoculation of the transformed cells into baby rats contained areas of poorly differentialted hepatocellular carcinoma,In situ hybridization analysis confirmed the random rather than specific integration of exogenous ras gene into host chromosomes.Furthermore,an at least tenfold increase in the expression of the endogenous c mys gene was detected among transformed cell lines,suggesting the involvement of the c myc proto oncogene in the in vitro transformation of rat liver epithelial cells by EJ Ha ras oncogene.

  16. Protection effect of trigonelline on liver of rats with non-alcoholic fatty liver diseases

    Institute of Scientific and Technical Information of China (English)

    Dong-Fang Zhang; Fan Zhang; Jin Zhang; Rui-Ming Zhang; Ran Li

    2015-01-01

    Objective:To study the effect of trigonelline on the change of indicators of serum transaminase, lipoprotein and liver lipid of model rats with non-alcoholic fatty liver diseases and on the expression level of Bcl-2 and Bax proteins.Methods:A total of 45 SD rats were randomly divided into Fthe control group, model group and trigonelline intervention group. Rats in the control group were fed with the common diet, while rats in the model group and intervention group were fed with the high fat diet. 8 weeks later, the intervention group received the intragastric administration of trigonellin e (with the dosage of 40 mg/kg/d) for 8 weeks; while control group and model group received the intragastric administration of saline with the equal dosage. Blood was taken from the abdominal aorta of rats 8 weeks later, detecting the level of a series of indicators of ALT, AST, TG, TC, HDL-C and LDL-C in the serum. After the rats were sacrificed, detect the indicators of TG, TC, SOD and MDA in the liver tissue of rats, as well as the expression of Bcl-2 and Bax in the liver tissue.Results: Results of histopathologic examination showed that the damage degree of liver for rats in the trigonellineintervention group was smaller than the one in the model group, with significantly reduced hepatic steatosis and the partially visible hepatic lobule. The levels of ALT, AST, TC and LDL-C in the serum of rats in the trigonelline group were significantly reduced, while the change in the levels of TG and HDL-C was not significantly different. The levels of TG, TC and MDA in the liver tissues were significantly decreased, while the level of SOD significantly increased; the expression of Bcl-2 protein in the liver tissues of rats in the trigonelline intervention group was significantly increased, while the expression of Bax protein significantly decreased.Conclusions: The trigonelline contributes to the therapeutic effect of non-alcoholic fatty liver diseases. It can also increase the

  17. Liver volume, as assessed by four ultrasonic crystals arranged to form a tetrahedron, decreases during anaphylactic shock in anesthetized rats.

    Science.gov (United States)

    Takano, Hiromichi; Shibamoto, Toshishige; Zhang, Wei; Kurata, Yasutaka

    2010-12-01

    We determined the hepatic volume change in anaphylactic hypotension by using four ultrasonic crystals in anesthetized rats. The hepatic volume was measured with four ultrasonic crystals arranged to form a tetrahedron on the liver surface. Before in vivo experiments, using isolated perfused rat liver preparations, we compared the measured liver volume changes with the whole-liver weight changes during hepatic blood flow rate changes and venoconstriction induced by norepinephrine. The measured relative change of the tetrahedron volume (V[utc]; percentage changes of the initial volume) was closely correlated with the liver weight change (W; percentage changes of the initial liver weight): V(utc) = 0.85W - 4.11 (r² = 0.67). Then, we measured the liver weight and the tetrahedron volume during hepatic anaphylaxis in isolated perfused liver excised from the rats sensitized with ovalbumin. An injection of the antigen into the perfusate caused anaphylactic venoconstriction, liver weight loss (1.1 ± 0.3 g; 9% ± 1%), and the tetrahedron volume reduction (12% ± 4%). Finally, we measured the liver volume change during anaphylactic hypotension in anesthetized ovalbumin-sensitized rats. When the antigen was i.v. injected into anesthetized rats, along with systemic hypotension and hepatic venoconstriction, the liver tetrahedron volume decreased by 6% ± 2% from baseline. In conclusion, we established a method to measure the hepatic volume by using four ultrasonic crystals forming a tetrahedron. Using this ultrasonic crystal method, we demonstrated that liver volume decreases during anaphylactic hypotension in anesthetized rats.

  18. Uncoupling of oxidative phosphorylation in rat liver mitochondria by chloroethanols

    Energy Technology Data Exchange (ETDEWEB)

    Bhat, H.K.; Asimakis, G.K.; Anasari, G.A.S. (Univ. of Texas Medical Branch, Galveston (United States))

    1991-03-11

    Chloroethanols are toxic chemicals used in the industry and also formed as a result of the metabolism of several widely used halogenated hydrocarbons. The effect of 2-chloroethanol (CE), 2,2-dichloroethanol (DCE) and 2,2,2-trichloroethanol (TCE) on rat liver mitochondrial respiration was studied. Rat liver mitochondria were prepared in a mitochondrial isolation medium consisting of 250 mM sucrose, 10 mM Tris-HCl and 1 mM EDTA. Respiration of the mitochondrial suspension was determined with an oxygen electrode at 25C and the polarographic buffer consisted of 250 mM mannitol, 10 mM KCl, 10 mM K{sub 2}HPO{sub 4}, 5 mM MgCl{sub 2}, 0.2 mM EDTA and 10 mM Tris-HCl. With succinate as the respiratory substrate and using chloroethanols, CE stimulated respiration by 28.2 {plus minus} 6.5% and DCE by 202.7 {plus minus} 8.2% while TCE inhibited mitochondrial respiration. The effect of change in the concentration of chloroethanols on mitochondrial respiration was also studied. CE showed maximum stimulation at 600 mM, DCE at 150 mM and TCE at 30 mM. Respiratory stimulation was independent of mitochondrial protein concentration. Chloroethanols inhibited mitochondrial respiration when glutamate-malate was used as the respiratory substrate. Estimation of adenosine triphosphate (ATP) generation showed that chloroethanols inhibited the synthesis of ATP. These results indicate that chloroethanols stimulate mitochondrial respiration by uncoupling oxidative phosphorylation and that the uncoupling potency is proportional to the extent of chlorination.

  19. Transcriptome atlas of eight liver cell types uncovers effects of histidine catabolites on rat liver regeneration

    Indian Academy of Sciences (India)

    C. F. Chang; J. Y. Fan; F. C. Zhang; J. Ma; C. S. Xu

    2010-12-01

    Eight liver cell types were isolated using the methods of Percoll density gradient centrifugation and immunomagnetic beads to explore effects of histidine catabolites on rat liver regeneration. Rat Genome 230 2.0 Array was used to detect the expression profiles of genes associated with metabolism of histidine and its catabolites for the above-mentioned eight liver cell types, and bioinformatic and systems biology approaches were employed to analyse the relationship between above genes and rat liver regeneration. The results showed that the urocanic acid (UA) was degraded from histidine in Kupffer cells, acts on Kupffer cells itself and dendritic cells to generate immune suppression by autocrine and paracrine modes. Hepatocytes, biliary epithelia cells, oval cells and dendritic cells can convert histidine to histamine, which can promote sinusoidal endothelial cells proliferation by GsM pathway, and promote the proliferation of hepatocytes and biliary epithelia cells by GqM pathway.

  20. Transcriptome atlas of eight liver cell types uncovers effects of histidine catabolites on rat liver regeneration.

    Science.gov (United States)

    Chang, C F; Fan, J Y; Zhang, F C; Ma, J; Xu, C S

    2010-12-01

    Eight liver cell types were isolated using the methods of Percoll density gradient centrifugation and immunomagnetic beads to explore effects of histidine catabolites on rat liver regeneration. Rat Genome 230 2.0 Array was used to detect the expression profiles of genes associated with metabolism of histidine and its catabolites for the above-mentioned eight liver cell types, and bioinformatic and systems biology approaches were employed to analyse the relationship between above genes and rat liver regeneration. The results showed that the urocanic acid (UA) was degraded from histidine in Kupffer cells, acts on Kupffer cells itself and dendritic cells to generate immune suppression by autocrine and paracrine modes. Hepatocytes, biliary epithelia cells, oval cells and dendritic cells can convert histidine to histamine, which can promote sinusoidal endothelial cells proliferation by GsM pathway, and promote the proliferation of hepatocytes and biliary epithelia cells by GqM pathway.

  1. Establishment of animal model of dual liver transplantation in rat.

    Directory of Open Access Journals (Sweden)

    Ying Zhang

    Full Text Available The animal model of the whole-size and reduced-size liver transplantation in both rat and mouse has been successfully established. Because of the difficulties and complexities in microsurgical technology, the animal model of dual liver transplantation was still not established for twelve years since the first human dual liver transplantation has been made a success. There is an essential need to establish this animal model to lay a basic foundation for clinical practice. To study the physiological and histopathological changes of dual liver transplantation, "Y" type vein from the cross part between vena cava and two iliac of donor and "Y' type prosthesis were employed to recanalize portal vein and the bile duct between dual liver grafts and recipient. The dual right upper lobes about 45-50% of the recipient liver volume were taken as donor, one was orthotopically implanted at its original position, the other was rotated 180° sagitally and heterotopically positioned in the left upper quadrant. Microcirculation parameters, liver function, immunohistochemistry and survival were analyzed to evaluate the function of dual liver grafts. No significant difference in the hepatic microcirculatory flow was found between two grafts in the first 90 minutes after reperfusion. Light and electronic microscope showed the liver architecture was maintained without obvious features of cellular destruction and the continuity of the endothelium was preserved. Only 3 heterotopically positioned graft appeared patchy desquamation of endothelial cell, mitochondrial swelling and hepatocytes cytoplasmic vacuolization. Immunohistochemistry revealed there is no difference in hepatocyte activity and the ability of endothelia to contract and relax after reperfusion between dual grafts. Dual grafts made a rapid amelioration of liver function after reperfusion. 7 rats survived more than 7 days with survival rate of 58.3.%. Using "Y" type vein and bile duct prosthesis, we

  2. Estrogen reduces CCL4- induced liver fibrosis in rats

    Institute of Scientific and Technical Information of China (English)

    Jun-Wang Xu; Jun Gong; Xin-Ming Chang; Jin-Yan Luo; Lei Dong; Zhi-Ming Hao; Ai Jia; Gui-Ping Xu

    2002-01-01

    AIM: Chronic liver diseases, such as fibrosis or cirrhosis,are more common in men than in women. This genderdifference may be related to the effects of sex hormones onthe liver. The aim of the present work was to investigatethe effects of estrogen on CCL4-induced fibrosis of the liverin rats.METHODS: Liver fibrosis was induced in male, female andovariectomized rats by CCL4 administration. All the groupswere treated with estradiol(1 mg/kg) twice weekly. Andtamoxifen wasgiven to male fibrosis model. At the end of 8weeks, all therats were killed to study serum indicators andthe livers.RESULTS: Estradiol treatment reduced aspartateaminotransferase(AST), alanine aminotransferase (ALT),hyaluronic acid(HA) and type IV collagen(CIV) in sera,suppressed hepatic collagen content, decreased the areas ofhepatic stellate cells (HSC) positive for α-smooth muscle actin(α-SMA), and lowered the synthesis of hepatic type I collagensignificantly in both sexes and ovariectomy fibrotic rats inducedby CCL4 administration. Whereas, tamoxifen had the oppositeeffect. The fibrotic response of the female liver to CCL4treatment was significantly weaker than that of male liver.CONCLUSION: Estradiol reduces CCL4-induced hepaticfibrosis in rats. The antifibrogenic role of estrogen in theliver may be one reason for the sex associated differencesin the progression from hepatic fibrosis to cirrhosis.

  3. Biosynthesis of thiamine triphosphate and identification of thiamine diphosphate-binding proteins of rat liver hyaloplasm

    Energy Technology Data Exchange (ETDEWEB)

    Voskoboev, A.I.; Chernikevich, I.P.

    1986-03-10

    The nature of the proteins of rat liver hyaloplasm that bind ThDP* was studied. When injection of (/sup 14/C)thiamine was used as the marker, an electrophoretically homogeneous protein preparations, containing (/sup 14/C)ThDP, identified as transketolase, was isolated from the soluble fraction of the liver. No other nonenzymatic proteins that bind ThDP and might serve as the substrate in the synthesis of ThTP were detected in the hyaloplasm. It was shown that transfer of the phosphate group by rat liver ThDP kinase occurs to the free ThDP, and not to protein-bound ThDP, as was previously asserted.

  4. Therapeutic effect of osthole on hyperlipidemic fatty liver in rats

    Institute of Scientific and Technical Information of China (English)

    Yan ZHANG; Mei-lin XIE; Lu-jia ZHU; Zhen-lun GU

    2007-01-01

    Aim: To study the effects of osthole on hyperlipidemic fatty liver and investigate the possible mechanisms. Methods: A rat model with hyperlipidemic fatty liver was successfully established by feeding fatty milk for 6 weeks. The experimental rats were then treated with 5-20 mg/kg osthole for 6 weeks. The mouse hypedipi-demic model was induced by feeding fatty milk when they were treated with 10-20 mg/kg osthole for 3 weeks. Results: After treatment with osthole, the levels of rat serum total cholesterol (TC), triglyceride (TG) and low density lipoprotein-choles-terol significantly decreased as compared with the fatty liver model group (P<0.05 or P<0.01). Hepatic weight and its coefficient, the hepatic tissue contents of TC,TG, and malondialdehyde, also significantly decreased (P<0.05 or P<0.01). In fatty milk-induced hyperlipidemic mice, the post-heparin plasma activities of lipo-protein lipase (LPL), hepatic lipase (HL), and total lipase (TL) significantly increased after treatment with 10-20 mg/kg osthole for 3 weeks (P<0.05 or P<0.01).Importantly, the histological evaluation of rat liver demonstrated that osthole dramatically decreased lipid accumulation (P<0.01). Conclusion: Osthole was found to have therapeutic effects on fatty milk-induced rat fatty liver; the mecha-nisms might be associated with its anti-oxidation and the elevation of the activi-ties of LPL and HL.

  5. Effects of Samarium on Liver and Kidney of Rats

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Spraque-Dawley(SD)big rats with weaning weight of (195±15) g were randomly divided into 4 groups with 8 males and 8 females each group. One group drank de-ionized water served as control and also used for analysis with the background. The other three groups were cultured for five months by drinking de-ionized water with 3.0, 4.5 and 6.0 mg·L-1 Sm (NO3)3, respectively. Compared with the rats in control, it is found that the organs of the treated rats are apparently pathologically changed, such as liver swell, lung intumescence, peritoneum conglutination and hardness. Especially, in the high Sm group, the pathological percentage in liver and lung is up to 30%. The pathological changes in liver and lung show that rare earth Sm does hazard biological effects to animals. With increasing Sm concentration, the weight rate of organ/body has a tendency of increasing; the activity of superoxide dismutase (SOD) in liver and kidney decreases, but the maglonydiadehyde (MDA) concentration increases, indicating the abilities of anti-oxidation and the lipid per-oxidation inhibition degenerate, which leads to hard pathological changes in organs. Moreover, the relative weight rate of organ/body, the activity of SOD and the MDA concentration are remarkably lager in liver than in kidney and other organs, suggesting that the biological effect of Sm on liver is the greatest and Sm has a high affinity for liver.

  6. Differential selectivity of cytochrome P450 inhibitors against probe substrates in human and rat liver microsomes

    Science.gov (United States)

    Eagling, Victoria A; Tjia, John F; Back, David J

    1998-01-01

    Aims Chemical inhibitors of cytochrome P450 (CYP) are a useful tool in defining the role of individual CYPs involved in drug metabolism. The aim of the present study was to evaluate the selectivity and rank the order of potency of a range of isoform-selective CYP inhibitors and to compare directly the effects of these inhibitors in human and rat hepatic microsomes. Methods Four chemical inhibitors of human cytochrome P450 isoforms, furafylline (CYP1A2), sulphaphenazole (CYP2C9), diethyldithiocarbamate (CYP2E1), and ketoconazole (CYP3A4) were screened for their inhibitory specificity towards CYP-mediated reactions in both human and rat liver microsomal preparations. Phenacetin O-deethylation, tolbutamide 4-hydroxylation, chlorzoxazone 6-hydroxylation and testosterone 6β-hydroxylation were monitored for enzyme activity. Results Furafylline was a potent, selective inhibitor of phenacetin O-deethylation (CYP1A2-mediated) in human liver microsomes (IC50 = 0.48 μm), but inhibited both phenacetin O-deethylation and tolbutamide 4-hydroxylation (CYP2C9-mediated) at equimolar concentrations in rat liver microsomes (IC50 = 20.8 and 24.0 μm respectively). Sulphaphenazole demonstrated selective inhibition of tolbutamide hydroxylation in human liver microsomes but failed to inhibit this reaction in rat liver microsomes. DDC demonstrated a low level of selectivity as an inhibitory probe for chlorzoxazone 6-hydroxylation (CYP2E1-mediated). DDC also inhibited testosterone 6β-hydroxylation (CYP3A-mediated) in man and rat, and tolbutamide 4-hydroxylase activity in rat. Ketoconazole was a very potent, selective inhibitor of CYP3A4 activity in human liver (IC50 = 0.04 μm). Although inhibiting CYP3A in rat liver it also inhibited all other reactions at concentrations ≤5 μm. Conclusions It is evident that CYP inhibitors do not exhibit the same selectivity in human and rat liver microsomes. This is due to differential selectivity of the inhibitors and/or differences in the CYP

  7. The effect of Sachalin rhodiola rhizome extract on liver starch and liver cell morphous of sports fatigue rat

    Institute of Scientific and Technical Information of China (English)

    JI Yu-bin; LI Rui; JI Chen-feng

    2008-01-01

    Objective To inspect the effect of Sachalin rhodiola rhizome extract to the swimming time and content of liver starch and liver cells morphous of sports fatigue rat. Methods Using weight loading swimming to determine swimming time, using kits to determine liver starch, using transmission electron microscope to observe the diversify of rat liver ceils morphous and construction. Results To compare with negative control group, the Sachalin rhodiola rhizome extract can obviously extend survival time of swimming rat, increase the content of liver starch. Conclusions Sachalin rhodiola rhizome extract can raise the staying power of sports fatigue rat, strengthen sport ability and play a part in antifatigue by increasing the content of liver starch and protecting liver cells of sports fatigue rat.

  8. A possible physiological role of taurine in the adult female rat liver

    National Research Council Canada - National Science Library

    Pierre, Y; Chatagner, F

    1981-01-01

    ...) in the liver of the lactating rat: 1.84 twenty-one days after the birth of pups. These observations suggest a physiological role for the higher concentration of taurine in the liver of the adult female rat...

  9. Variability of mammalian liver nuclear-envelope preparations.

    Science.gov (United States)

    Agutter, P S; Gleed, C D

    1980-10-15

    The composition, density and enzymic activities of sheep liver nuclear-envelope preparations were found to vary markedly according to the concentrations of nuclei during the lysis stage. The effect of nuclear concentration on the properties of the purified envelopes could not be attributed to bound Mg2+ or to other ions, and appeared to result from some component of the nucleus which was not eluted during lysis. The implications of these findings for studies on the nuclear envelope are discussed.

  10. Selective bioreduction of nitroxides by rat liver microsomes

    Energy Technology Data Exchange (ETDEWEB)

    Rosen, G.M.; Rauckman, E.J.; Hanck, K.W.

    1977-09-01

    Presented are possible explanations for the inability of rat liver microsomes to reduce 2-ethyl-2,4,4-trimethyl-3-oxazolidinyloxy (OXAN) even though the reduction potential for OXAN is identical to that for 2,2,6,6-tetramethylpiperidinoxyl (TEMPO) and di-tert-butyl nitroxide (DTBN), both of which are reduced by these microsomes. It is suggested that the conformation of OXAN prevents these enzymes from reducing the compound. Administration of phenobarbital was found to induce the synthesis of a form of cytochrome P-450, which enabled the rat liver microsomes to reduce the OXAN. (2 diagrams, 9 references)

  11. Biotransformation of myrislignan by rat liver microsomes in vitro.

    Science.gov (United States)

    Li, Fei; Yang, Xiu-Wei

    2008-02-01

    Myrislignan (1), erythro-(1R,2S)-2-(4-allyl-2,6-dimethoxyphenoxyl)-1-(4-hydroxy-3-methoxyphenyl) propan-1-ol, is a major acyclic neolignan in seeds of Myristica fragrans. Studies have suggested that myrislignan may deter feeding activity, but little is known about its metabolism. We investigated the biotransformation of myrislignan by rat liver microsomes in vitro. Seven metabolites were produced by liver microsomes from rats pre-treated with sodium phenobarbital. These were identified, using spectroscopic methods, as myrislignanometins A-G (2-8), respectively.

  12. Neonatally induced diabetes: liver glycogen storage in pregnant rats

    Directory of Open Access Journals (Sweden)

    Isabela Lovizutto Iessi

    2012-04-01

    Full Text Available The aim of this sstudy was to evaluate the liver glycogen storage in pregnant rats presenting neonatal streptozotocin-induced diabetes and to establish a relation with glycemia and insulin levels. Wistar rats were divided in to two groups: 1 Mild Diabetes (STZ - received streptozotocin (glycemia from 120 to 300 mg/dL, 2 Control - received vehicle (glycemia below 120 mg/dL. At days 0, 7, 14 and 21 of the pregnancy, body weight and glycemia were evaluated. At day 21 of the pregnancy, the rats were anesthetized for blood and liver collection so as to determine insulin and liver glycogen, which showed no changes in the STZ group as compared to the controls. In the STZ group, maternal weight gain were lower as compared to those in the control group. Significantly increased glycemia was observed at days 0 and 14 of the pregnancy in the STZ group. Therefore, neonatally induced diabetes in the rats did not cause metabolic changes that impaired insulin and liver glycogen relation in these rats.

  13. Oxidative and conjugative metabolism of xenobiotics by livers of cattle, sheep, swine and rats.

    Science.gov (United States)

    Smith, G S; Watkins, J B; Thompson, T N; Rozman, K; Klaassen, C D

    1984-02-01

    Homogenate preparations from fresh livers of cattle, sheep, swine and rats were assayed for microsomal cytochrome P-450 content, for mixed-function oxidase activities and for a wide array of conjugative activities using numerous xenobiotic substrates. Results show that hepatic enzymatic capabilities toward xenobiotics do not parallel phylogenetic classifications, thus strengthening the view that most of the comparative data available at present is more descriptive than predictive of relationships among species. Livestock species differed widely from rats in having lower activities of benzo(alpha)pyrene hydroxylase, glutathione S-transferase and acetyltransferase toward isoniazid and sulfamethazine and UDP-glucuronosyl-transferase toward bilirubin. Acetyltransferase activities toward beta-naphthylamine and 2-aminofluorene were not detected in livers of livestock species studied. Cattle livers were remarkably high in activities of styrene oxide hydrolase, ethoxyresorufin O-deethylase, 2-naphthol sulfotransferase and p-aminobenzoic acid acetyltransferase; but notably low in activity of glutathione-S-transferase toward sulfobromophthalein and 1,2-dichloro-4-nitrobenzene. Swine livers had low activity of glutathione-S-transferase toward four of six substrates and low acetyltransferase activity toward four of five substrates. Sheep livers generally were higher than cattle livers in sulfo- and UDP-glucuronsyltransferase activities and lower in acetyl- and glutathionyl-S-transferase. Findings emphasize the risk of error in extra-polations among species and in extrapolations among substrates.

  14. The Dimethylnitrosamine Induced Liver Fibrosis Model in the Rat.

    Science.gov (United States)

    Chooi, Kum Fai; Kuppan Rajendran, Dinesh Babu; Phang, Siew Siang Gary; Toh, Han Hui Alden

    2016-06-17

    Four to six week old, male Wistar rats were used to produce animal models of liver fibrosis. The process requires four weeks of administration of 10 mg/kg dimethylnitrosamine (DMN), given intraperitoneally for three consecutive days per week. Intraperitoneal injections were performed in the fume hood as DMN is a known hepatoxin and carcinogen. The model has several advantages. Firstly, liver changes can be studied sequentially or at particular stages of interest. Secondly, the stage of liver disease can be monitored by measurement of serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) enzymes. Thirdly, the severity of liver damage at different stages can be confirmed by sacrifice of animals at designated time points, followed by histological examination of Masson's Trichome stained liver tissues. After four weeks of DMN dosing, the typical fibrosis score is 5 to 6 on the Ishak scale. The model can be reproduced consistently and has been widely used to assess the efficacy of potential anti-fibrotic agents.

  15. Distribution of nitric oxide synthase positive neurons in the substantia nigra of rats with liver cirrhosis

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    BACKGROUND:Nitrogen monoxide plays an important role in the physiological activity and pathological process of striatum in substantia nigra, and the nitric oxide synthase in substantia nigra may have characteristic changes after liver cirrhosis.OBJECTIYE: To observe the distribution and forms of nitric oxide synthase (NOS) positive neurons and fibers in substantia nigra of rats with liver cirrhosis.DESIGN: A comparative observational experiment.SETTINGS: Beijing Friendship Hospital; Capital Medical University.MATERIALS: Twenty 4-month-old male Wistar rats (120 - 150 g) of clean grade, were maintained in a 12-hour light/dark cycle at a constant temperature with free access to standard diet and water. Cryostat microtome (LEICA, Germany); All the reagents were purchased from Sigma Company.METHODS: The experiment was carried out in the Department of Anatomy (key laboratory of Beijing city),Capital Medical University from July 2000 to March 2002. The rats were randomly divided into normal group (n=10) and liver fibrosis group (n=10). Rats in the liver fibrosis group were subcutaneously injected with 60% CCl4 oil at a dose of 5 mL/kg for the first time, and 3 mL/kg for the next 14 times, twice a week,totally 15 times. Liver fibrosis of grades 5 - 6 was taken as successful models. Whereas rats in the normal group were not given any treatment. Four months after CCl4 treatment, all the rats were anesthetized to remove brain, and frontal frozen serial sections were prepared. The expressions of nitric oxide synthase positive neurons in substantia nigra of rats were observed under inverted microscope. The number and gray scale of cell body of nitric oxide synthase positive neurons in substantia nigra were detected with NADPH-diaphorase staining.MAIN OUTCOME MEASURES: ①Number and gray scale of cell body of nitric oxide synthase positive neurons in substantia nigra; ②Expressions of nitric oxide synthase positive neurons in substantia nigra.RESULTS: All the 20 rats were

  16. Caffeine induction of sulfotransferases in rat liver and intestine.

    Science.gov (United States)

    Zhou, Tianyan; Chen, Yue; Huang, Chaoqun; Chen, Guangping

    2012-10-01

    Sulfotransferases (SULTs) are important phase II drug-metabolizing enzymes. Regulation of SULTs by hormones and other endogenous molecules is relatively well understood, while xenobiotic induction of SULTs is not well studied. Caffeine is one of the most widely consumed psychoactive substances. However, SULT regulation by caffeine has not been reported. In this report, male and female rats were treated with different oral doses of caffeine (2, 10, 50 mg kg⁻¹ per day) for 7 days. Western blot and real-time RT-PCR were used to investigate the changes in SULT protein and mRNA expression following the caffeine treatment. Caffeine induced both rat aryl sulfotransferase (rSULT1A1, AST-IV) and rat hydroxysteroid sulfotransferase (rSULT2A1, STa) in the liver and intestine of female rats in a dose-dependent manner. Caffeine induction of rSULT1A1 and rSULT2A1 in the female rat intestine was much stronger than that in the liver. Although caffeine induced rSULT1A1 significantly in the male rat liver, it did not significantly induce rSULT2A1. In male rat intestine, caffeine significantly induced rSULT2A1. The different SULTs induction patterns in male and female rats suggest that the regulation of rat SULTs by caffeine may be affected by different hormone secretion patterns and levels. Our results suggest that consumption of caffeine can induce drug metabolizing SULTs in drug detoxification tissues.

  17. Improved nanoparticles preparation and drug release for liver targeted delivery

    Directory of Open Access Journals (Sweden)

    Qiao Weili

    2009-05-01

    Full Text Available "nTargeted delivery of drugs and proteins to liver can be achieved via asialoglycoprotein receptor, which can recognize and combine the galactose- and N-acetygalatosamine-terminated glycoproteins. Glycosyl is usually conjugated with drugs directly to fabricate prodrugs or with nanoparticles encapsulated drugs via forming covalent bonds, while the covalent bonds may lead to some shortages for drug release. Therefore, we have a hypothesis that we can prepare nanoparticles for efficient targeting by glycosylation using galactosylated poly (L-glutamic acid (Gal-PLGA as a carrier to entrap the model drugs in nanoparticles core physically rather than forming covalent drug conjugation. The means of incorporation of drug in nanoparticles may improve drug release to maintain its activity, raise its therapeutic index and diminish the adverse effect. Based on previous researches, it is achievable to obtain nanoparticles that we hypothesize to prepare. Due to their nanometer-size and galactosyl, the nanoparticles may be a potential delivery system for passive and active targeting to liver parenchymal cells for therapy of hepatitis and liver cancer.

  18. Antifibrotic effect of heparin on liver fibrosis model in rats

    Institute of Scientific and Technical Information of China (English)

    Binita; Shah; Gaurang; Shah

    2012-01-01

    AIM: To evaluate the effect of chronic thrombin inhibition by heparin on experimentally induced chronic liver injury (liver fibrosis) in rats. METHODS: Chronic liver injury (liver fibrosis) was induced in Wistar rats by oral administration of carbon tetrachloride (CCl 4 ) for 7 wk, an animal model with persistent severe hepatic fibrosis. Intravenous administration of the thrombin antagonist (heparin) started 1 wk after the start of CCl 4 intoxication for 6 wk. After completion of treatment (7 wk), markers of hepatic dysfunction were measured and changes evaluated histopathologically. RESULTS: Higher serum glutamate oxaloacetate transaminase (SGOT), serum glutamate pyruvate transaminase (SGPT), alkaline phosphatase (ALP), total, direct and indirect bilirubin levels, as well as lower fibrinogen levels, were found in CCl 4 intoxicated rats. Heparin, silymarin and combination of drug (heparin and silymarin) treatment for 6 wk prevented a rise in SGOT, SGPT, ALP, total, direct and indirect bilirubin levels and improved fibrinogen levels. Deterioration in hepatic function determined by the fibrosis area was retarded, as evident from hepatic histopathology. Total protein levels were not changed in all groups.CONCLUSION: Heparin, a thrombin antagonist, preserved hepatic function and reduced severity of hepatic dysfunction/fibrogenesis. Combination of heparin and silymarin produced additional benefits on liver fibrosis.

  19. Chemoprevention of rat liver toxicity and carcinogenesis by Spirulina.

    Science.gov (United States)

    Ismail, Mohamed F; Ali, Doaa A; Fernando, Augusta; Abdraboh, Mohamed E; Gaur, Rajiv L; Ibrahim, Wael M; Raj, Madhwa H G; Ouhtit, Allal

    2009-06-02

    Spirulina platensis (SP) is a filamentous cyanobacterium microalgae with potent dietary phyto-antioxidant, anti-inflammatory and anti-cancerous properties. The present study aimed to investigate the chemopreventive effect of SP against rat liver toxicity and carcinogenesis induced by dibutyl nitrosamine (DBN) precursors, and further characterized its underlying mechanisms of action in HepG2 cell line. Investigation by light and electron microscopy showed that DBN treatment induced severe liver injury and histopathological abnormalities, which were prevented by SP supplementation. The incidence of liver tumors was significantly reduced from 80 to 20% by SP. Immunohistochemical results indicated that both PCNA and p53 were highly expressed in the liver of DBN-treated rats, but were significantly reduced by SP supplementation. Molecular analysis indicated that SP treatment inhibited cell proliferation, which was accompanied by increased p21 and decreased Rb expression levels at 48hrs post-treatment. In addition, SP increased Bax and decreased Bcl-2 expression, indicating induction of apoptosis by 48hrs. This is the first report of the in vivo chemopreventive effect of SP against DBN-induced rat liver cytotoxicity and carcinogenesis, suggesting its potential use in chemoprevention of cancer.

  20. Research of combined liver-kidney transplantation model in rats

    Institute of Scientific and Technical Information of China (English)

    Jiageng Zhu; Jun Li; Ruipeng Jia; Jianghao Su; Mingshun Shen; Zhigang Cao

    2007-01-01

    Objective: To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods: SD rats served as both donors and recipients. 4℃ sodium lactate Ringer's was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava (IVC) inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results: Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion: This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.

  1. Chemical structure and biochemical significance of lysolecithins from rat liver

    NARCIS (Netherlands)

    Bosch, H. van den; Deenen, L.L.M. van

    1965-01-01

    1. 1. Synthetic lecithins containing in 2-position a [14C]fatty acid constituent were found to be hydrolysed by rat-liver homogenates so as to form both 1-acyl-glycero-3-phosphorylcholine and 2-acyl-glycero-3-phosphorylcholine. 2. 2. A comparison of the fatty acid pattern of lysolecithin obtained f

  2. Two New Lactones Metabolized from Isoline by Rat Liver Microsomes

    Institute of Scientific and Technical Information of China (English)

    Jun TANG; Zheng Tao WANG; Teruaki AKAO; Norio NAKAMURA; Masao HATTORI

    2003-01-01

    Two new metabolites, namely bisline lactone and isolinecic acid lactone, were isolated from the resultant incubates after a scale-up incubation of isoline with rat liver microsomes. Their structures were determined by spectroscopic data, especially those from 1D and 2D NMR experiments.

  3. Accumulation of pyruvate by isolated rat liver mitochondria

    NARCIS (Netherlands)

    Vaartjes, W.J.; Geelen, M.J.H.; Bergh, S.G. van den

    1979-01-01

    1. 1. Various methods to measure the rate of accumulation of [3-14C]pyruvate in the sucrose-impermeable space of isolated rat liver mitochondria are tested and compared with respect to their ability to distinguish between carrier-linked pyruvate transport and non-carrier-linked processes (adsorption

  4. Chemical structure and biochemical significance of lysolecithins from rat liver

    NARCIS (Netherlands)

    Bosch, H. van den; Deenen, L.L.M. van

    1965-01-01

    1. 1. Synthetic lecithins containing in 2-position a [14C]fatty acid constituent were found to be hydrolysed by rat-liver homogenates so as to form both 1-acyl-glycero-3-phosphorylcholine and 2-acyl-glycero-3-phosphorylcholine. 2. 2. A comparison of the fatty acid pattern of lysolecithin obtained f

  5. Effects of diffusible products of peroxidation of rat liver microsomal lipids

    Science.gov (United States)

    Benedetti, Angelo; Casini, Alessandro F.; Ferrali, Marco; Comporti, Mario

    1979-01-01

    The effects on cellular structures of products of peroxidation of rat liver microsomal lipids were investigated. A system containing actively peroxidizing liver microsomal fraction was separated from a revealing or target system by a dialysis membrane. The target system, contained in the dialysis tube, consisted of either intact cells (erythrocytes) or subcellular fractions (liver microsomal fraction). When liver microsomal fractions were incubated with NADPH (or an NADPH-generating system), lipid peroxidation, as measured by the amount of malonaldehyde formed, occurred very rapidly. The malon-aldehyde concentration tended to equilibrate across the dialysis membrane. When the target system consisted of erythrocytes, haemolysis occurred abruptly after a lag phase. The lysis was greatly accelerated when erythrocytes from vitamin E-deficient rats were used, but no haemolysis was observed when erythrocytes from vitamin E-treated rats were used. When, in the same system, freshly prepared liver microsomal fractions were exposed to diffusible factors produced by lipid peroxidation, the glucose 6-phosphatase activity markedly decreased. A similar decrease in glucose 6-phosphatase activity, as well as a smaller but significant decrease in cytochrome P-450, was observed when the target microsomal fractions were exposed to diffusible factors derived from the peroxidation of liver microsomal lipids in a separate preincubation step. These and additional experiments indicated that the toxicological activity is relatively stable. Experiments in which the hepatic microsomal fractions destined for lipid peroxidation contained radioactively labelled arachidonic acid, previously incorporated into the membranes, showed that part of the radioactivity released from the microsomal fraction into the incubation medium entered the dialysis tube and was recovered bound to the constituents of the microsomal fractions of the target system. These results indicate that during the course of the

  6. Melatonin protects liver from intestine ischemia reperfusion injury in rats

    Institute of Scientific and Technical Information of China (English)

    Jian-Yi Li; Hong-Zhuan Yin; Xi Gu; Yong Zhou; Wen-Hai Zhang; Yi-Min Qin

    2008-01-01

    AIM:To investigate the protective effect of melatonin on liver after intestinal ischemia-reperfusion injury in rats.METHODS:One hundred and fifty male Wistar rats,weighing 190-210 g,aged 7 wk,were randomly divided into melatonin exposure group,alcohol solvent control group and normal saline control group.Rats in the melatonin exposure group received intraperitoneal (IP) melatonin (20 mg/kg) 30 min before intestinal ischemia-reperfusion (IR),rats in the alcohol solvent control group received the same concentration and volume of alcohol,and rats in the normal saline control group received the same volume of normal saline.Serum samples were collected from each group 0.5,1,6,12,and 24 h after intestinal IR.Levels of serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) were measured with an auto-biochemical analyzer.Serum TNF-a was tested by enzyme-linked immunosorbent assay (ELISA).Malondialdehyde (MDA) in liver was detected by colorimetric assay.Pathological changes in liver and immunohistochemical straining of ICAM-1 were observed under an optical microscope.RESULTS:The levels of ALT measured at various time points after intestinal IR in the melatonin exposure group were significantly lower than those in the other two control groups (P<0.05).The serum AST levels 12 and 24 h after intestinal IR and the ICAM-1 levels (%) 6,12 and 24 h after intestinal IR in the melatonin exposure group were also significantly lower than those in the other two control groups (P<0.05).CONCLUSION:Exotic melatonin can inhibit the activity of ALT,AST and TNF-a decrease the accumulation of MDA,and depress the expression of ICAM-1 in liver after intestinal IR injury,thus improving the liver function.

  7. Muscle and liver glycogen, protein, and triglyceride in the rat

    DEFF Research Database (Denmark)

    Richter, Erik; Sonne, Bente; Joensen Mikines, Kari

    1984-01-01

    in skeletal muscle was accompanied by increased breakdown of triglyceride and/or protein. Thus, the effect of exhausting swimming and of running on concentrations of glycogen, protein, and triglyceride in skeletal muscle and liver were studied in rats with and without deficiencies of the sympatho......-adrenal system. In control rats, both swimming and running decreased the concentration of glycogen in fast-twitch red and slow-twitch red muscle whereas concentrations of protein and triglyceride did not decrease. In the liver, swimming depleted glycogen stores but protein and triglyceride concentrations did...... not decrease. In exercising rats, muscle glycogen breakdown was impaired by adrenodemedullation and restored by infusion of epinephrine. However, impaired glycogen breakdown during exercise was not accompanied by a significant net breakdown of protein or triglyceride. Surgical sympathectomy of the muscles did...

  8. Effects of Buyang Huanwu Decoction on antioxidant and drug-metabolizing enzymes in rat liver.

    Science.gov (United States)

    Fan, Xing-Hua; Shi, Wei-Zhou; Cheng, Yun-Xiang; Yang, Xiu-Fen

    2014-06-01

    To study the effect of Buyang Huanwu Decoction (BYHWD) on the antioxidant enzymes and drug-metabolizing enzymes in rat liver. Following treatment of rats with BYHWD at 6.42, 12.83, or 25.66 g·kg(-1) per day for 15 days, microsomes and cytosols isolated from the liver tissues were prepared by differential centrifugation according to standard procedures. The activities of the antioxidant enzymes and cytochrome b5, NADPH-cytochrome P450 reductase, CYP3A, CYP2E1, UGT, and GST of the rat livers were determined by UV-Vis spectrophotometer. The activities of ALT, AST, antioxidant enzymes, and the Hepatosomatic Index in serum were not significantly affected. In cytosols, the activity of CAT was significantly increased at the dosage of 12.83 g·kg(-1), and all the other antioxidant activities and MDA levels were not affected by this treatment. BYHWD had no effect on cytochrome b5, NADPH-cytochrome P450 reductase, CYP3A, and UGT. At the highest dose (25.66 g·kg(-1)), the activity of CYP2E1 was significantly inhibited, and the activities of GST and the level of GSH were increased. BYHWD is safe for the liver, and has the functions of detoxification and antioxidant. Patients should be cautioned about the herb-drug interaction of BYHWD and CYP2E1 substrates. Copyright © 2014 China Pharmaceutical University. Published by Elsevier B.V. All rights reserved.

  9. Protective effect of liver ischemic preconditioning on rat hepatocytes

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    Ischemic preconditioning (IPC) protects liver graft function following ischemia in liver transplantation and liver resection. The aim of this study was to assess the advantages and any potential disadvantages of liver IPC prior to isolation for rat hepatocytes during isolation and cryopreservation. After isolating and thawing the cryopreserved hepatocytes after 14 and 28 d,cell viability,efficiency,and lactate dehydrogenase (LDH) levels in preserve solution were examined for every group. Groups treated with IPC had better cell viability determination,assessment of plating efficiency and lactate dehydrogenase (LDH) assay than Group without IPC,suggesting that IPC prior to isolation may have a significant protective effect on hepatocytes subjected to isolation and short period cryopreservation.

  10. Graft reconditioning with nitric oxide gas in rat liver transplantation from cardiac death donors.

    Science.gov (United States)

    Kageyama, Shoichi; Yagi, Shintaro; Tanaka, Hirokazu; Saito, Shunichi; Nagai, Kazuyuki; Hata, Koichiro; Fujimoto, Yasuhiro; Ogura, Yasuhiro; Tolba, Rene; Shinji, Uemoto

    2014-03-27

    Liver transplant outcomes using grafts donated after cardiac death (DCD) remain poor. We investigated the effects of ex vivo reconditioning of DCD grafts with venous systemic oxygen persufflation using nitric oxide gas (VSOP-NO) in rat liver transplants. Orthotopic liver transplants were performed in Lewis rats, using DCD grafts prepared using static cold storage alone (group-control) or reconditioning using VSOP-NO during cold storage (group-VSOP-NO). Experiment I: In a 30-min warm ischemia model, graft damage and hepatic expression of inflammatory cytokines, endothelial nitric oxide synthase (eNOS), inducible nitric oxide synthase (iNOS), and endothelin-1 (ET-1) were examined, and histologic analysis was performed 2, 6, 24, and 72 hr after transplantation. Experiment II: In a 60-min warm ischemia model, grafts were evaluated 2 hr after transplantation (6 rats/group), and survival was assessed (7 rats/group). Experiment I: Group-VSOP-NO had lower alanine aminotransferase (ALT) (PVSOP-NO.Experiment II: VSOP-NO decreased ET-1 and 8-hydroxy-2'deoxyguanosine (8-OHdG) expression and improved survival after transplantation by 71.4% (PVSOP-NO effectively reconditions warm ischemia-damaged grafts, presumably by decreasing ET-1 upregulation and oxidative damage.

  11. Plasminogen binding to rat hepatocytes in primary culture and to thin slices of rat liver

    Energy Technology Data Exchange (ETDEWEB)

    Gonias, S.L.; Braud, L.L.; Geary, W.A.; VandenBerg, S.R. (Univ. of Virginia Health Sciences Center, Charlottesville (USA))

    1989-08-01

    Human {sup 125}I-plasminogen bound readily to rat hepatocytes in primary culture at 4 {degree}C and at 37{degree}C. Binding was inhibited by lysine and reversed by lysine, epsilon-aminocaproic acid, or nonradiolabeled plasminogen. The Kd for binding of {sup 125}I-plasminogen to hepatocytes was 0.59 +/- 0.16 mumol/L, as determined from the saturation isotherm by nonlinear regression (r2 = 0.99) and the Scatchard transformation by linear regression (r2 = 0.93). The number of sites per cell was 14.1 +/- 1.1 x 10(6). Fibrinogen synthesis and secretion by hepatocytes was insufficient to account for the major fraction of plasminogen binding, as determined by enzyme-linked immunosorbent assay (ELISA). Polyacrylamide gel electrophoresis and trichloroacetic acid precipitation studies demonstrated that plasminogen is neither activated nor degraded when bound to hepatocytes at 37{degree}C. Thin slices of whole rat liver (500 microns), isolated and prepared totally at 4{degree}C, bound {sup 125}I-plasminogen. Binding was inhibited by lysine. {sup 125}I-albumin binding to liver slices was minimal and not inhibited by lysine. Activation of plasminogen by tissue plasminogen activator (t-PA) was enhanced by hepatocytes in primary culture. When lysine was included in the media, the enhanced rate of activation was no longer observed. After activation with t-PA, much of the plasmin remained associated with hepatocyte surfaces and was partially protected from inhibition by alpha 2-antiplasmin. These studies suggest that hepatocyte plasminogen binding sites may provide important surface anticoagulant activity.

  12. Protective Effects of Hydrolyzed Nucleoproteins from Salmon Milt against Ethanol-Induced Liver Injury in Rats

    Directory of Open Access Journals (Sweden)

    Akiko Kojima-Yuasa

    2016-12-01

    Full Text Available Dietary nucleotides play a role in maintaining the immune responses of both animals and humans. Oral administration of nucleic acids from salmon milt have physiological functions in the cellular metabolism, proliferation, differentiation, and apoptosis of human small intestinal epithelial cells. In this study, we examined the effects of DNA-rich nucleic acids prepared from salmon milt (DNSM on the development of liver fibrosis in an in vivo ethanol-carbon tetrachloride cirrhosis model. Plasma aspartate transaminase and alanine transaminase were significantly less active in the DNSM-treated group than in the ethanol plus carbon tetrachloride (CCl4-treated group. Collagen accumulation in the liver and hepatic necrosis were observed histologically in ethanol plus CCl4-treated rats; however, DNSM-treatment fully protected rats against ethanol plus CCl4-induced liver fibrosis and necrosis. Furthermore, we examined whether DNSM had a preventive effect against alcohol-induced liver injury by regulating the cytochrome p450 2E1 (CYP2E1-mediated oxidative stress pathway in an in vivo model. In this model, CYP2E1 activity in ethanol plus CCl4-treated rats increased significantly, but DNSM-treatment suppressed the enzyme’s activity and reduced intracellular thiobarbituric acid reactive substances (TBARS levels. Furthermore, the hepatocytes treated with 100 mM ethanol induced an increase in cell death and were not restored to the control levels when treated with DNSM, suggesting that digestive products of DNSM are effective for the prevention of alcohol-induced liver injury. Deoxyadenosine suppressed the ethanol-induced increase in cell death and increased the activity of alcohol dehydrogenase. These results suggest that DNSM treatment represents a novel tool for the prevention of alcohol-induced liver injury.

  13. Protective Effects of Hydrolyzed Nucleoproteins from Salmon Milt against Ethanol-Induced Liver Injury in Rats.

    Science.gov (United States)

    Kojima-Yuasa, Akiko; Goto, Mayu; Yoshikawa, Eri; Morita, Yuri; Sekiguchi, Hirotaka; Sutoh, Keita; Usumi, Koji; Matsui-Yuasa, Isao

    2016-12-19

    Dietary nucleotides play a role in maintaining the immune responses of both animals and humans. Oral administration of nucleic acids from salmon milt have physiological functions in the cellular metabolism, proliferation, differentiation, and apoptosis of human small intestinal epithelial cells. In this study, we examined the effects of DNA-rich nucleic acids prepared from salmon milt (DNSM) on the development of liver fibrosis in an in vivo ethanol-carbon tetrachloride cirrhosis model. Plasma aspartate transaminase and alanine transaminase were significantly less active in the DNSM-treated group than in the ethanol plus carbon tetrachloride (CCl₄)-treated group. Collagen accumulation in the liver and hepatic necrosis were observed histologically in ethanol plus CCl₄-treated rats; however, DNSM-treatment fully protected rats against ethanol plus CCl₄-induced liver fibrosis and necrosis. Furthermore, we examined whether DNSM had a preventive effect against alcohol-induced liver injury by regulating the cytochrome p450 2E1 (CYP2E1)-mediated oxidative stress pathway in an in vivo model. In this model, CYP2E1 activity in ethanol plus CCl₄-treated rats increased significantly, but DNSM-treatment suppressed the enzyme's activity and reduced intracellular thiobarbituric acid reactive substances (TBARS) levels. Furthermore, the hepatocytes treated with 100 mM ethanol induced an increase in cell death and were not restored to the control levels when treated with DNSM, suggesting that digestive products of DNSM are effective for the prevention of alcohol-induced liver injury. Deoxyadenosine suppressed the ethanol-induced increase in cell death and increased the activity of alcohol dehydrogenase. These results suggest that DNSM treatment represents a novel tool for the prevention of alcohol-induced liver injury.

  14. [Effect of rapeseed from different distributors on the rat liver].

    Science.gov (United States)

    Alvizouri, M

    1993-01-01

    In previous papers it was reported that rapeseed could prevent the development of cirrhosis induced by carbon tetrachloride and at the same time can induce liver regeneration in the rat. In such experiments rapeseed was always obtained from the same distributor "Semillas Berentsen". When reseed of different distributors was used, neither cirrhosis prevention or liver regeneration was observed. The difference among the rapeseed used was that "Semillas Berentsen" utilizes a fungicide to preserve the seed and the other distributors do not use any preservative. This circumstance made think that the active principle responsible for the effects observed is probably the fungicide.

  15. Expressed genes in regenerating rat liver after partial hepatectomy

    Institute of Scientific and Technical Information of China (English)

    Cun-Shuan Xu; Salman Rahrnan; Jing-Bo Zhang; Cui-Fang Chang; Jin-Yun Yuan; Wen-Qiang Li; Hong-Peng Han; Ke-Jin Yang; Li-Feng Zhao; Yu-Chang Li; Hui-Yong Zhang

    2005-01-01

    AIM: To reveal the liver regeneration (LR) and its controlas well as the occurrence of liver disease and to study the gene expression profiles of 551 genes after partial hepatectomy (PH) in regenerating rat livers.METHODS: Five hundred and fifty-one expressed sequence tags screened by suppression subtractive hybridization were made into an in-house cDNA microarray, and the expressive genes and their expressive profiles in regenerating rat livers were analyzed by microarray and bioinformatics. RESULTS: Three hundred of the analyzed 551 genes were up- or downregulated more than twofolds at one or more time points during LR. Most of the genes were up- or downregulated 2-5 folds, but the highest reached 90 folds of the control. One hundred and thirty-nine of themshowed upregulation, 135 displayed downregulation, and up or down expression of 26 genes revealed a dependence on regenerating livers. The genes expressedin 24-h regenerating livers were much more than those in the others. Cluster analysis and generalization analysis showed that there were at least six distinct temporal patterns of gene expression in the regenerating livers, that is, genes were expressed in the immediate early phase, early phase, intermediate phase, early-late phase, late phase, terminal phase. CONCLUSION: In LR, the number of down-regulated genes was almost similar to that of the upregulated genes; the successively altered genes were more than the rapidly transient genes. The temporal patterns of gene expression were similar 2 and 4 h, 12 and 16 h, 48 and 96 h, 72 and 144 h after PH. Microarray combined with suppressive subtractive hybridization can effectively identify the genes related to LR.

  16. The isolated perfused rat liver : standardization of a time-honoured model

    NARCIS (Netherlands)

    Bessems, M.; t'Hart, N. A.; Tolba, R.; Doorschodt, B. M.; D Leuvenink, H. G.; Ploeg, R. J.; Minor, T.; van Gulik, T. M.

    For many years, the isolated perfused rat liver (IPRL) model has been used to investigate the physiology and pathophysiology of the rat liver. This in vitro model provides the opportunity to assess cellular injury and liver function in an isolated setting. This review offers an update of recent

  17. Inhibitory effects of beryllium chloride on rat liver microsomal enzymes.

    Science.gov (United States)

    Teixeira, C F; Yasaka, W J; Silva, L F; Oshiro, T T; Oga, S

    1990-04-30

    A single i.v. dose (0.1 mmol Be2+/kg) of beryllium chloride prolonged the duration of pentobarbital-induced sleep and zoxazolamine-induced paralysis, in rats. The effects are correlated with changes of the pharmacokinetic parameters and with the in vitro inhibition of both aliphatic and aromatic hydroxylation of pentobarbital and zoxazolamine. In vitro N-demethylation of meperidine and aminopyrine was partially inhibited while O-demethylation of quinidine was unaffected by liver microsomes of rats pretreated with beryllium salt. The findings give clues that beryllium chloride inhibits some forms of cytochrome P-450, especially those responsible for hydroxylation of substrates, like pentobarbital and zoxazolamine.

  18. Characterization of cationic acid phosphatase isozyme from rat liver mitochondria.

    Science.gov (United States)

    Fujimoto, S; Murakami, K; Hosoda, T; Yamamoto, Y; Watanabe, K; Morinaka, Y; Ohara, A

    1992-05-01

    Acid phosphatase isozyme was highly purified from rat liver mitochondrial fraction. The enzyme showed an isoelectric point value of above 9.5 on isoelectric focusing, and the apparent molecular weight was estimated to be 32000 by Sephadex G-100 gel filtration or 16000 by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The enzyme catalyzed the hydrolysis of adenosine 5'-triphosphate, adenosine 5'-diphosphate, thiamine pyrophosphate, inorganic pyrophosphate, and phosphoprotein such as casein and phosvitin, but not of several phosphomonoesters, except for p-nitrophenyl phosphate and o-phosphotyrosine. The enzyme was not inhibited by L-(+)-tartrate, and was significantly activated by Fe2+ and reducing agents such as ascorbic acid, L-cysteine,and dithiothreitol. The enzyme was found to be distributed in various rat tissues including liver, spleen, kidney, small intestine, lung, stomach, brain and heart, but not in skeletal muscle.

  19. Functional state of rat liver RNA polymerase IA and IB.

    Science.gov (United States)

    Zoncheddu, A; Accomando, R; Pertica, M; Orunesu, M

    1979-01-01

    Phosphocellulose chromatography has been employed to characterize RNA polymerase I present in two different functional states in rat liver cells. The actively transcribing enzyme solubilized from nuclei appears to belong both to the IA and IB classes, whereas the non-transcribing enzyme present in the cytoplasmic fraction has been found to belong only to the IA class. Indirect and direct evidence indicates, however, that in isolated nuclei only the IB form is to be regarded as the physiological form of the enzyme, the IA form arising as a procedural artefact during the extraction process. It may, therefore, be concluded that rat liver IA and IB RNA polymerase are to be strictly regarded as the non-transcribing and transcribing form of the enzyme, respectively.

  20. Low-dose ATRA Supplementation Abolishes PRM Formation in Rat Liver and Ameliorates Ethanol-induced Liver Injury

    Institute of Scientific and Technical Information of China (English)

    PAN Zhihong; DAN Zili; FU Yu; TANG Wangxian; LIN Jusheng

    2006-01-01

    The effects of all-trans-retinoic acid (ATRA) in low doses supplementation on concentrations of polar retinoid metabolites (PRM) and retinoids in the ethanol-fed rat liver, and on hepatocyte injury were investigated. The rat model of alcoholic liver disease (ALD) was induced by intragastric infusion of ethanol, and then the rats were administrated with ATRA in two different doses (150 μg/kg body weight and 1.5 mg/kg body weight) for 4 weeks. Concentrations of retinoids in rat liver and plasma were determined by using HPLC. Liver tissues pathologic changes were observed under the light microscopy and electron microscopy. The serum transaminases concentrations were measured. The results showed that the HPLC analysis of retinoids revealed that retinoids (vitamin A,RA, retinyl palmitate) concentrations in ethanol-fed rat liver and RA concentration in ethanol-fed rat plasma were markedly diminished (P<0.01) after ethanol feeding for 12 weeks. Furthermore, obvious peaks of PRM were formed in livers of ethanol-fed rats. ATRA 150 μg/kg supplementation in ethanol-fed rats for 4 weeks raised RA concentration in both liver and plasma, and also raised vitamin A concentration in liver to control levels, partially restored retinyl palmitate concentration (P<0.05) in liver. ATRA 1.5 mg/kg supplementation raised not only RA concentrations in liver and plasma but also retinyl palmitate concentrations in liver. However, the vitamin A concentration in liver of ATRA-supplemented rats (1.5 mg/kg) was higher than that of controls (P<0.05). The histologic observation of liver tissues indicated that ATRA treatment notably alleviated hepatocellular swelling,steatosis, the swelling of mitochondria and proliferation of smooth endoplasmic reticulum (SER).ATRA treatment greatly decreased levels of serum transaminases as compared with the only ethanol-fed group (P<0.05). It was concluded that low-dose ATRA treatment could restore retinoids concentrations and abolish the PRM formation

  1. Bone disorders in experimentally induced liver disease in growing rats

    Institute of Scientific and Technical Information of China (English)

    Viktória Ferencz; Ferenc Szalay; Csaba Horváth; Béla Kári; János Gaál; Szilvia Mészáros; Zsuzsanna Wolf; Dalma Hegedüs; Andrea Horváth; Anikó Folhoffer

    2005-01-01

    AIM: To investigate the change of bone parameters in a new model of experimentally induced liver cirrhosis and hepatocellular carcinoma (HCC) in growing rats.METHODS: Fischer-344 rats (n = 55) were used. Carbon tetrachloride (CCl4), phenobarbital (PB), and a single diethylnitrosamine (DEN) injection were used. Animals were killed at wk 8 and 16. Bone mineral content, femoral length, cortical index (quotient of cortical thickness and whole diameter) and ultimate bending load (Fmax)of the femora were determined. The results in animals treated with DEN+PB+CCl4 (DPC, n = 21) were compared to those in untreated animals (UNT,n = 14) and in control group treated only with DEN+PB (DP, n = 20).RESULTS: Fatty liver and cirrhosis developed in each DPC-treated rat at wk 8 and HCC was presented at wk 16. No skeletal changes were found in this group at wk 8,but each parameter was lower (P<0.05 for each) at wk 16 in comparison to the control group. Neither fatty liver nor cirrhosis was observed in DP-treated animals at any time point. Femoral length and Fmax values were higher (P<0.05 for both) in DP-treated animals at wk 8 compared to the UNT controls. However, no difference was found at wk 16.CONCLUSION: Experimental liver cirrhosis and HCC are accompanied with inhibited skeletal growth, reduced bone mass, and decreased mechanical resistance in growing rats. Our results are in concordance with the data of other studies using different animal models. A novel finding is the transiently accelerated skeletal growth and bone strength after a 8-wk long phenobarbital treatment following diethylnitrosamine injection.

  2. 4-Nitrocatechol production from rho-nitrophenol by rat liver.

    Science.gov (United States)

    Chrastil, J; Wilson, J T

    1975-05-01

    Time course studies of rho-nitroanisole O-demethylation revealed formaldehyde production in excess of rho-nitrophenol (PNP) and 4-nitrocatechol (NTC) formation by rat liver microsomes. This indicated that these products (PNP, NTC) were metabolised further. The hydroxylation reaction PNP yields NTC showed substrate and product inhibition and a requirement for reduced nicotinamide adenine dinucleotide phosphate and O2 and was localized in liver microsomes. It was strongly activated by ascorbic acid, cysteine, adenosine triphosphate or hydroxylamine in vitro and enhanced by phenobarbital treatment in vivo. Mercapturic derivatives were metabolized to the corresponding hydroxy compounds with the same speed as their parent compounds. Both PNP and NTC were metabolized to the corresponding glucuronide and sulfate conjugates. On the other hand, the PNP or NTC glucuronides and sulfates were metabolized with liver microsomes to PNP and NTC.

  3. Stereoselective metabolism of tetrahydropalmatine enantiomers in rat liver microsomes.

    Science.gov (United States)

    Zhao, Ming; Li, Li-Ping; Sun, Dong-Li; Sun, Si-Yuan; Huang, Shan-Ding; Zeng, Su; Jiang, Hui-Di

    2012-05-01

    Tetrahydropalmatine (THP), with one chiral center, is an active alkaloid ingredient in Rhizoma Corydalis. The aim of the present paper is to study whether THP enantiomers are metabolized stereoselectively in rat, mouse, dog, and monkey liver microsomes, and then, to elucidate which Cytochrome P450 (CYP) isoforms are predominately responsible for the stereoselective metabolism of THP enantiomers in rat liver microsomes (RLM). The results demonstrated that (+)-THP was preferentially metabolized by liver microsomes from rats, mice, dogs, and monkeys, and the intrinsic clearance (Cl(int)) ratios of (+)-THP to (-)-THP were 2.66, 2.85, 4.24, and 1.67, respectively. Compared with the metabolism in untreated RLM, the metabolism of (-)-THP and (+)-THP was significantly increased in dexamethasone (Dex)-induced and β-naphthoflavone (β-NF)-induced RLM; meanwhile, the Cl(int) ratios of (+)-THP to (-)-THP in Dex-induced and β-NF-induced RLM were 5.74 and 0.81, respectively. Ketoconazole had stronger inhibitory effect on (+)-THP than (-)-THP, whereas fluvoxamine had stronger effect on (-)-THP in untreated and Dex-induced or β-NF-induced RLM. The results suggested that THP enantiomers were predominately metabolized by CYP3A1/2 and CYP1A2 in RLM, and CYP3A1/2 preferred to metabolize (+)-THP, whereas CYP1A2 preferred (-)-THP.

  4. Stereoselective degradation of chiral fungicide myclobutanil in rat liver microsomes.

    Science.gov (United States)

    Yan, Jin; Zhang, Ping; Wang, Xinru; Wang, Yao; Zhou, Zhiqiang; Zhu, Wentao

    2014-01-01

    Myclobutanil, (RS)-2-(4-chlorophenyl)-2-(1H-1, 2, 4-triazol-1-ylmethyl)hexanenitrile is a broad-spectrum systemic triazole fungicide which consists of a pair of enantiomers. The stereoselective degradation of myclobutanil was investigated in rat liver microsomes. The concentrations of myclobutanil enantiomers were determined by high-performance liquid chromatography (HPLC) with a cellulose-tris-(3,5-dimethyl-phenylcarbamate)-based chiral stationary phase (CDMPC-CSP) under reversed phase condition. The t(1/2) of (+)-myclobutanil is 8.49 min, while the t(1/2) of (-)-myclobutanil is 96.27 min. Such consequences clearly indicated that the degradation of myclobutanil in rat liver microsomes was stereoselective and the degradation rate of (+)-myclobutanil was much faster than (-)-myclobutanil. In addition, significant differences between two enantiomers were also observed in enzyme kinetic parameters. The V(max) of (+)-myclobutanil was about 4-fold of (-)-myclobutanil and the CL(int) of (+)-myclobutanil was three times as much as (-)-myclobutanil after incubation in rat liver microsomes. Corresponding consequences may shed light on the environmental and ecological risk assessment for myclobutanil and may improve human health.

  5. Isolation and purification of rat liver morphine UDP-glucuronosyltransferase

    Energy Technology Data Exchange (ETDEWEB)

    Puig, J.F.; Tephly, T.R.

    1986-03-05

    The enhancement of rat liver microsomal morphine (M) and 4-hydroxybiphenyl (4-HBP) UDP-glucuronyltransferase (UDPGT) activities by phenobarbital treatment has been proposed to represent increased activity of a single enzyme form, GT-2. They have separated M and 4-HBP UDPGT activities from Emulgen 911-solubilized microsomes obtained from livers of phenobarbital-treated Wistar rats. A sensitive assay procedure was developed to quantify M-UDPGT and 4-HBP-UDPGT activities using /sup 14/C-UDP-glucuronic acid (UDPGA) and reversed phase C-18 minicolumns whereby the radioactive glucuronides were differentially eluted from labeled UDPGA. Trisacryl DEAE, and chromatofocusing procedures were employed to separate M-UDPGT and 4-HBP-UDPGT in the presence of exogenous phosphatidylcholine (PC). The PC is necessary to stabilize UDPGT activities. M-UDPGT was isolated to apparent homogeneity and displayed a monomeric molecular weight of 56,000 daltons on SDS-PAGE. It reacted with M but not with 4-HBP, bilirubin, p-nitrophenol, testosterone, androsterone, estrone, 4-aminobiphenyl or ..cap alpha..-naphthylamine. 4-HBP-UDPGT did not react with M. Therefore, M and 4-HBP glucuronidations are catalyzed by separate enzymes in rat liver microsomes.

  6. Methyleugenol hepatocellular cancer initiating effects in rat liver.

    Science.gov (United States)

    Williams, Gary M; Iatropoulos, Michael J; Jeffrey, Alan M; Duan, Jian-Dong

    2013-03-01

    Methyleugenol (MEG), a constituent of plants used in the human diet, is hepatocarcinogenic in rodents. In an experiment to elucidate its mode of action in rat liver, male F344 rats were administered MEG intragastrically at 3 doses per week for up to 16 weeks in an initiation phase, after which half the rats were fed 500 ppm phenobarbital (PB) in the diet to promote liver neoplasia and the other half were maintained on control diet for 24 weeks. At 8 and 16 week interim terminations, (32)P-nucleotide postlabeling assay revealed 3 adducts in livers of all MEG groups. The hepatocellular replicating fractions, measured by proliferating cell nuclear antigen immunohistochemistry, were doubled or more in all MEG groups. Hepatocellular altered foci, detected by glutathione S-transferase-placental type (π) immunohistochemistry, were present beginning with the high dose group at 8 weeks and extending to all MEG groups at 16 weeks. At the end of maintenance/promotion phase, the incidences, multiplicity and size of foci was similar between control and low dose groups, while those of mid and high dose groups were increased. Hepatocellular adenomas occurred in the mid and high dose groups, attaining higher multiplicity and size with PB. Thus, MEG had rapid initiating activity, reflecting the formation of DNA adducts and possibly cell proliferation. Copyright © 2012 Elsevier Ltd. All rights reserved.

  7. Quercetin Reverses Rat Liver Preneoplastic Lesions Induced by Chemical Carcinogenesis

    Directory of Open Access Journals (Sweden)

    Gabriela Carrasco-Torres

    2017-01-01

    Full Text Available Quercetin is a flavonoid widely studied as a chemopreventive agent in different types of cancer. Previously, we reported that quercetin has a chemopreventive effect on the liver-induced preneoplastic lesions in rats. Here, we evaluated if quercetin was able not only to prevent but also to reverse rat liver preneoplastic lesions. We used the modified resistant hepatocyte model (MRHM to evaluate this possibility. Treatment with quercetin was used 15 days after the induction of preneoplastic lesions. We found that quercetin reverses the number of preneoplastic lesions and their areas. Our results showed that quercetin downregulates the expression of EGFR and modulates this signaling pathway in spite of the activated status of EGFR as detected by the upregulation of this receptor, with respect to that observed in control rats. Besides, quercetin affects the phosphorylation status of Src-1, STAT5, and Sp-1. The better status of the liver after the treatment with quercetin could also be confirmed by the recovery in the expression of IGF-1. In conclusion, we suggest that quercetin reversed preneoplastic lesions by EGFR modulation and the activation state of Src, STAT5, and Sp1, so as the basal IGF-1.

  8. Paritaprevir and Ritonavir Liver Concentrations in Rats as Assessed by Different Liver Sampling Techniques.

    Science.gov (United States)

    Venuto, Charles S; Markatou, Marianthi; Woolwine-Cunningham, Yvonne; Furlage, Rosemary; Ocque, Andrew J; DiFrancesco, Robin; Dumas, Emily O; Wallace, Paul K; Morse, Gene D; Talal, Andrew H

    2017-05-01

    The liver is crucial to pharmacology, yet substantial knowledge gaps exist in the understanding of its basic pharmacologic processes. An improved understanding for humans requires reliable and reproducible liver sampling methods. We compared liver concentrations of paritaprevir and ritonavir in rats by using samples collected by fine-needle aspiration (FNA), core needle biopsy (CNB), and surgical resection. Thirteen Sprague-Dawley rats were evaluated, nine of which received paritaprevir/ritonavir at 30/20 mg/kg of body weight by oral gavage daily for 4 or 5 days. Drug concentrations were measured using liquid chromatography-tandem mass spectrometry on samples collected via FNA (21G needle) with 1, 3, or 5 passes (FNA1, FNA3, and FNA5); via CNB (16G needle); and via surgical resection. Drug concentrations in plasma were also assessed. Analyses included noncompartmental pharmacokinetic analysis and use of Bland-Altman techniques. All liver tissue samples had higher paritaprevir and ritonavir concentrations than those in plasma. Resected samples, considered the benchmark measure, resulted in estimations of the highest values for the pharmacokinetic parameters of exposure (maximum concentration of drug in serum [Cmax] and area under the concentration-time curve from 0 to 24 h [AUC0-24]) for paritaprevir and ritonavir. Bland-Altman analyses showed that the best agreement occurred between tissue resection and CNB, with 15% bias, followed by FNA3 and FNA5, with 18% bias, and FNA1 and FNA3, with a 22% bias for paritaprevir. Paritaprevir and ritonavir are highly concentrated in rat liver. Further research is needed to validate FNA sampling for humans, with the possible derivation and application of correction factors for drug concentration measurements. Copyright © 2017 American Society for Microbiology.

  9. Expression of AFP and Rev-Erb A/Rev-Erb B and N-CoR in fetal rat liver, liver injury and liver regeneration

    OpenAIRE

    Meier, Volker; Tron, Kyrylo; Batusic, Danko; Elmaouhoub, Abderrahim; Ramadori, Giuliano

    2006-01-01

    Background Alpha-fetoprotein (AFP) expression can resume in the adult liver under pathophysiological conditions. Orphan nuclear receptors were supposed to regulate AFP gene expression, in vitro. We were interested to study the expression of AFP and orphan nuclear receptors, in vivo. Results The expression of AFP gene and orphan nuclear receptors in the liver was examined in different rat models: (a) fetal liver (b) liver regeneration [partial hepatectomy (PH) with and without 2-acetyl-aminofl...

  10. Mercury-selenium interactions in relation to histochemical staining of mercury in the rat liver.

    Science.gov (United States)

    Baatrup, E; Thorlacius-Ussing, O; Nielsen, H L; Wilsky, K

    1989-02-01

    Selenium has been suggested to enhance the histochemical staining of mercury when sections of tissue are subjected to the silver-enhancement method. In the present study, histochemical staining patterns of mercury in tissue sections of rat livers were compared with the actual content of organic and inorganic Hg in the livers, in both the presence and the absence of Se. Rats were injected intravenously with 5 micrograms of Hg g-1 body weight as methyl [203Hg] mercury chloride (MeHg) or as [203Hg]mercuric chloride (Hg2+). After 2 h, half the rats received an additional intraperitoneal injection of 2 micrograms of Se g-1 body weight as sodium [75Se]selenite. All the rats were killed 1 h later. Homogenized liver samples were prepared for mercury analysis by two different methods: alkaline digestion and ultrasonic disintegration. Quantitative chemical analysis based on benzene extraction of the radioactively labelled Hg compounds showed that the chemical form of mercury, either organic or inorganic, was preserved from its administration to its deposition in the liver. Light and electron microscopy demonstrated that no silver enhancement of Hg occurred when MeHg alone was present in the sections of tissue, whereas MeHg accompanied by Se induced a moderate deposition of silver grains. In contrast, sections containing Hg2+ alone yielded some staining, and the addition of Se increased the staining dramatically. The results of the present study show that acute selenite pretreatment is a prerequisite for the histochemical demonstration of methyl mercury, and greatly increases the staining of inorganic mercury when applying the silver-enhancement method.

  11. Hepato-biliary profile of potential candidate liver progenitor cells from healthy rat liver

    Institute of Scientific and Technical Information of China (English)

    Céric Maerckx; Isabelle Scheers; Tatiana Tondreau; David Campard; Omar Nyabi; Mustapha Najimi; Etienne Sokal

    2012-01-01

    AIM:To evaluate the presence of progenitor cells in healthy adult rat liver displaying the equivalent advanced hepatogenic profile as that obtained in humans.METHODS:Rat fibroblastic-like liver derived cells (rFLDC) were obtained from collagenase-isolated liver cell suspensions and characterized and their phenotype profile determined using flow cytometry,immunocyto-chemistry,reverse transcription polymerase chain reaction and functional assays.RESULTS:rFLDC exhibit fibroblastoid morphology,express mesenchymal (CD73,CD90,vimentin,α-smooth muscle actin),hepatocyte (UGT1A1,CK8) and biliary (CK19) markers.Moreover,these cells are able to store glycogen,and have glucose 6 phosphatase activity,but not UGT1A1 activity.Under the hepatogenic differentiation protocol,rFLDC display an up-regulation of hepatocyte markers expression (albumin,tryptophan 2,3-dioxygenase,G6Pase) correlated to a down-regulation of the expression of the biliary marker CK19.CONCLUSION:Advanced hepatic features observed in human liver progenitor cells could not be demonstrated in rFLDC.However,we demonstrated the presence of an original rodent hepato-biliary cell type.

  12. Preventive effect of zinc on nickel-induced oxidative liver injury in rats

    African Journals Online (AJOL)

    MIDOU

    2013-12-18

    Dec 18, 2013 ... exposure of rats to nickel sulfate for 21 days resulted in a significant decrease in body weight gain and absolute liver weight ... Nickel treatment also produced oxidative liver injury ..... Biochemical toxicology of arsenic. Rev.

  13. [Effective method of isolating M4-lactate dehydrogenase from rat liver].

    Science.gov (United States)

    Gorbach, Z V; Maglysh, S S; Konovalenko, O V

    1984-01-01

    Lactate dehydrogenase M4-isoform in the homogeneous state was isolated from the rat liver by successive application of sulphate-ammonium fractionation, phosphocellulose ion-exchange chromatography with high-affinity elution of 1 mM NADH and subsequent hydroxyl apatite fractionation. The method permits obtaining the preparation amounts of the enzymic protein with yield 37.5%, specific activity 386.8 units per 1 mg of protein. It is established that 1 mM NAD+, 10 mM pyruvate and 100 mM lactate are also effective as agents of the selective enzyme elution.

  14. Development of a New Technique for Reconstruction of Hepatic Artery during Liver Transplantation in Sprague-Dawley Rat.

    Directory of Open Access Journals (Sweden)

    Xingmu Liu

    Full Text Available Sleeve anastomosis is the most common technique used to rearterialize orthotopic liver transplants (OLT. However, this technique has a number of disadvantages, including difficulty of performance of the technique visually unaided. We herein describe a novel rearterialized OLT model in the rat.Forty-six male Sprague Dawley rats (300-400 g were used as donors and recipients. Based on Kamada's cuff technique, the new model involved performing a modified "sleeve" anastomosis between the celiac trunk of the donor and common hepatic artery of the recipient to reconstruct blood flow to the hepatic artery. An additional ten male Sprague Dawley rats underwent liver transplantation without artery reconstruction. Liver grafts were retrieved from the two groups and histological examination was performed following surgery.Total mean operating times were ~42 minutes for the donor liver extraction and 57 minutes for the recipient transplantation. Graft preparation took an additional 15 minutes and the time to fix the arterial bracket was ~3 minutes. During transplantation, the anhepatic phase lasted 18 ± 2.5 min and the artery reconstruction only required ~3 minutes. The patency rate was 94.44% and the 4-week survival rate was 90%. Histology indicated obvious fibrosis in the liver grafts without artery reconstruction, while normal histology was observed in the arterialized graft.This new method allows for the surgical procedure to be performed visually unaided with good survival and patency rates and represents an alternative model investigating OLT in rats.

  15. Ebselen prevents early alcohol-induced liver injury in rats.

    Science.gov (United States)

    Kono, H; Arteel, G E; Rusyn, I; Sies, H; Thurman, R G

    2001-02-15

    Oxidants have been shown to be involved in alcohol-induced liver injury. Moreover, 2-phenyl-1,2-benzisoselenazole-3(2H)-one (ebselen), an organoselenium compound and glutathione peroxidase mimic, decreases oxidative stress and protects against stroke clinically. This study was designed to test the hypothesis that ebselen protects against early alcohol-induced liver injury in rats. Male Wistar rats were fed high-fat liquid diets with or without ethanol (10-16 g/kg/d) continuously for up to 4 weeks using the intragastric enteral feeding protocol developed by Tsukamoto and French. Ebselen (50 mg/kg twice daily, intragastrically) or vehicle (1% tylose) was administered throughout the experiment. Mean urine ethanol concentrations were not significantly different between treatment groups, and ebselen did not affect body weight gains or cyclic patterns of ethanol concentrations in urine. After 4 weeks, serum ALT levels were increased significantly about 4-fold over control values (37 +/- 5 IU/l) by enteral ethanol (112 +/- 7 IU/l); ebselen blunted this increase significantly (61 +/- 8 IU/l). Enteral ethanol also caused severe fatty accumulation, mild inflammation, and necrosis in the liver (pathology score: 4.3 +/- 0.3). In contrast, these pathological changes were blunted significantly by ebselen (pathology score: 2.5 +/- 0.4). While there were no significant effects of either ethanol or ebselen on glutathione peroxidase activity in serum or liver tissue, ebselen blocked the increase in serum nitrate/nitrite caused by ethanol. Furthermore, ethanol increased the activity of NF-kappaB over 5-fold, the number of infiltrating neutrophils 4-fold, and the accumulation of 4-hydroxynonenal over 5-fold. Ebselen blunted all of these effects significantly. These results indicate that ebselen prevents early alcohol-induced liver injury, most likely by preventing oxidative stress, which decreases inflammation.

  16. Melatonin and succinate reduce rat liver mitochondrial dysfunction in diabetes.

    Science.gov (United States)

    Zavodnik, I B; Lapshina, E A; Cheshchevik, V T; Dremza, I K; Kujawa, J; Zabrodskaya, S V; Reiter, R J

    2011-08-01

    Mitochondrial dysfunction and an increase in mitochondrial reactive oxygen species in response to hyperglycemia during diabetes lead to pathological consequences of hyperglycemia. The aim of the present work was to investigate the role of a specific functional damage in rat liver mitochondria during diabetes as well as to evaluate the possibility of metabolic and antioxidative correction of mitochondrial disorders by pharmacological doses of succinate and melatonin. In rat liver mitochondria, streptozotocin-induced diabetes was accompanied by marked impairments of metabolism: we observed a significant activation of α-ketoglutarate dehydrogenase (by 60%, pdiabetic animals, melatonin (10 mg/kg b.w., 30 days) or succinate (50 mg/kg b.w., 30 days) reversed the oxygen consumption rate V(3) and the acceptor control ratio to those in nondiabetic animals. Melatonin enhanced the inhibited activity of catalase in the cytoplasm of liver cells and prevented mitochondrial glutathione-S-transferase inhibition while succinate administration prevented α-ketoglutarate dehydrogenase activation. The mitochondria dysfunction associated with diabetes was partially remedied by succinate or melatonin administration. Thus, these molecules may have benefits for the treatment of diabetes. The protective mechanism may be related to improvements in mitochondrial physiology and the antioxidative status of cells.

  17. A disposition kinetic study of Tramadol in bile duct ligated rats in perfused rat liver model.

    Science.gov (United States)

    Esmaeili, Zohre; Mohammadi, Saeid; Nezami, Alireza; Rouini, Mohammad Reza; Ardakani, Yalda Hosseinzadeh; Lavasani, Hoda; Ghazi-Khansari, Mahmoud

    2017-07-01

    Tramadol hydrochloride is a centrally acting synthetic opioid analgesic drug and is used to treat chronic pain. In this study, the effects of Bile Duct Ligation (BDL) on the pharmacokinetics of tramadol in a liver recirculating perfusion system of male rats were used. Twenty-four Wistar male rats were randomly divided into four groups: control, sham and two weeks BDL and four weeks BDL. Serum levels of liver enzymes were measured before perfusion and the pharmacokinetics of tramadol was evaluated by using liver recirculating perfusion system. Tramadol and metabolites concentrations were determined by HPLC-FL. The sharp increase in liver enzymes level in both BDL groups was observed and significant changes were also observed in liver weight and volume. Tramadol metabolites concentration significantly decreased compared with the control and sham group (Ptramadol and increase in the half-life of the elimination of tramadol in rats with BDL suggests that personalized treatment and the therapeutic drug monitoring (TDM) data examination are necessary for patients with bile duct diseases and the dose of tramadol should be accordingly adjusted. Copyright © 2017 Elsevier Masson SAS. All rights reserved.

  18. Resveratrol inhibits nonalcoholic fatty liver disease in rats

    Directory of Open Access Journals (Sweden)

    Irastorza Belen

    2008-09-01

    Full Text Available Abstract Background The prevalence of nonalcoholic fatty liver disease (NAFLD is high. NAFLD is linked to obesity, diabetes mellitus, and hypertriglyceridemia. Approximately 20% of patients with NAFLD will eventually develop cirrhosis. Our purpose was to investigate whether resveratrol decreased hepatic steatosis in an animal model of steatosis, and whether this therapeutic approach resulted in a decrease in tumor necrosis factor α (TNF-α production, lipid peroxidation and oxidative stress. Methods Male Wistar CRL: Wi (Han (225 g rats were randomized into three groups. A control group (n = 12 was given free access to regular dry rat chow for 4 weeks. The steatosis (n = 12 and resveratrol (n = 12 groups were given free access to feed (a high carbohydrate-fat free modified diet and water 4 days per week, and fasted for the remaining 3 days for 4 weeks. Rats in the resveratrol group were given resveratrol 10 mg daily by the oral route. All rats were killed at 4 weeks and assessed for fatty infiltration and bacterial translocation. Levels of TNF-α in serum, hepatic malondialdehyde (MDA, oxidative stress (superoxide dismutase, glutathione peroxidase, catalase and nitric oxide synthase and biochemical parameters were measured. Results Fat deposition was decreased in the resveratrol group as compared to the steatosis group (Grade 1 vs Grade 3, P P P P Conclusion Resveratrol decreased NAFLD severity in rats. This effect was mediated, at least in part, by TNF-α inhibition and antioxidant activities.

  19. Metabolism of Mequindox in Isolated Rat Liver Cells

    Institute of Scientific and Technical Information of China (English)

    LI Guang-hui; SHAN Qi; WANG Jing; LI Ya-fei; GAO Yan; ZENG Zhen-ling

    2014-01-01

    Mequindox (MEQ), 3-methyl-2-quinoxalinacetyl-1,4-dioxide, is widely used in Chinese veterinary medicine as an antimicrobial agent and feed additive. Its toxicity has been reported to be closely related to its metabolism. To understand the pathways underlying MEQ’s metabolism more clearly, we studied its metabolism in isolated rat liver cells by using liquid chromatography coupled with electrospray ionization hybrid linear trap quadrupole orbitrap (LC-LTQ-Orbitrap) mass spectrometry. The structures of MEQ metabolites and their product ions were readily and reliably characterized on the basis of accurate MS2 spectra and known structure of MEQ. Eleven metabolites were detected in isolated rat liver cells, two of which were detected for the ifrst time in vitro. The major metabolic pathways reported previously for in vitro metabolism of MEQ in rat microsomes were conifrmed in this study, including N→O group reduction, carbonyl reduction, and methyl monohydroxylation. In addition, we found that acetyl hydroxylation was an important pathway of MEQ metabolism. The results also demonstrate that cellular systems more closely simulate in vivo conditions than do other in vitro systems such as microsomes. Taken together, these data contribute to our understanding of the in vivo metabolism of MEQ.

  20. Inhibition of ATP synthesis by fenbufen and its conjugated metabolites in rat liver mitochondria

    DEFF Research Database (Denmark)

    Syed, Muzeeb; Skonberg, Christian; Hansen, Steen Honoré

    2016-01-01

    in the drug induced liver injury (DILI) by fenbufen, the inhibitory effect of fenbufen and its conjugated metabolites on oxidative phosphorylation (ATP synthesis) in rat liver mitochondria was investigated. Fenbufen glucuronide (F-GlcA), fenbufen-N-acetyl cysteine-thioester (F-NAC) and fenbufen...... in inhibiting ATP synthesis. Fenbufen showed time and concentration dependent inhibition of ATP synthesis with Kinact of 4.4 min(-1) and KI of 0.88 μM and Kinact/KI ratio of 5.01 min(-1) μM(-1). Data show that fenbufen did not act through opening MPT pore, nor did incubation of mitochondria with reduced GSH...... and fenbufen show any protective effect on fenbufen mediated inhibition of oxidative phosphorylation. Inclusion of NADPH in mitochondrial preparations with fenbufen did not modulate the inhibitory effects, suggesting no role of CYP mediated oxidative metabolites on the ATP synthesis in isolated mitochondria...

  1. Effects of Neurolytic Celiac Plexus Block on Liver Regeneration in Rats with Partial Hepatectomy

    OpenAIRE

    Jun Li; Hong-Tao Yan; Jian-Xiang Che; Shu-Rong Bai; Qing-Ming Qiu; Ling Ren; Fan Pan; Xiao-Qin Sun; Fu-Zhou Tian; Dong-Xuan Li; Li-Jun Tang

    2013-01-01

    Liver regeneration is the basic physiological process after partial hepatectomy (PH), and is important for the functional rehabilitation of the liver after acute hepatic injury. This study was designed to explore the effects of neurolytic celiac plexus block (NCPB) on liver regeneration after PH. We established a model of PH in rats, assessing hepatic blood flow, liver function, and serum CRP, TNF-α, IL-1β and IL-6 concentrations of the residuary liver after PH. Additionally, histopathologica...

  2. Water permeability of rat liver mitochondria: A biophysical study.

    Science.gov (United States)

    Calamita, Giuseppe; Gena, Patrizia; Meleleo, Daniela; Ferri, Domenico; Svelto, Maria

    2006-08-01

    The movement of water accompanying solutes between the cytoplasm and the mitochondrial spaces is central for mitochondrial volume homeostasis, an important function for mitochondrial activities and for preventing the deleterious effects of excess matrix swelling or contraction. While the discovery of aquaporin water channels in the inner mitochondrial membrane provided valuable insights into the basis of mitochondrial plasticity, questions regarding the identity of mitochondrial water permeability and its regulatory mechanism remain open. Here, we use a stopped flow light scattering approach to define the water permeability and Arrhenius activation energy of the rat liver whole intact mitochondrion and its membrane subcompartments. The water permeabilities of whole brain and testis mitochondria as well as liposome models of the lipid bilayer composing the liver inner mitochondrial membrane are also characterized. Besides finding remarkably high water permeabilities for both mitochondria and their membrane subcompartments, the existence of additional pathways of water movement other than aquaporins are suggested.

  3. [Enzyme kinetics of ligustilide metabolism in rat liver microsomes].

    Science.gov (United States)

    Qian, Min; Shi, Li-fu; Hu, Jin-hong

    2009-04-01

    To study the enzyme kinetics of ligustilide metabolism and the effects of selective CYP450 inhibitors on the metabolism of ligustilide in liver microsomes of rat, a LC-MS method was established for quantitative analysis of ligustilide in liver microsomes incubation system with nitrendipine as internal standard. The determination m/z for ligustilide was 173, and for nitrendipine, 315. An optimum incubation system was found and various selective CYP inhibitors were used to investigate their inhibitory effects on the metabolism of ligustilide. The results showed that enzyme kinetics of ligustilide could be significantly inhibited by ketoconazole, trimethoprim and a-naphthoflavon but scarcely inhibited by omeprazole, 4-methylpyrazole and quinidine. Therefore, CYP3A4, CYP2C9 and CYP1A2 are the major isoenzyme participated in in vitro metabolism of ligustilide.

  4. Purification and characterization of rat liver minoxidil sulphotransferase.

    Science.gov (United States)

    Hirshey, S J; Falany, C N

    1990-01-01

    Minoxidil (Mx), a pyrimidine N-oxide, is used therapeutically as an antihypertensive agent and to induce hair growth in patients with male pattern baldness. Mx NO-sulphate has been implicated as the agent active in producing these effects. This paper describes the purification of a unique sulphotransferase (ST) from rat liver cytosol that is capable of catalysing the sulphation of Mx. By using DEAE-Sepharose CL-6B chromatography, hydroxyapatite chromatography and ATP-agarose affinity chromatography, Mx-ST activity was purified 240-fold compared with the activity in cytosol. The purified enzyme was also capable of sulphating p-nitrophenol (PNP) at low concentrations (less than 10 microM). Mx-ST was purified to homogeneity, as evaluated by SDS/PAGE and reverse-phase h.p.l.c. The active form of the enzyme had a molecular mass of 66,000-68,000 Da as estimated by gel exclusion chromatography and a subunit molecular mass of 35,000 Da. The apparent Km values for Mx, 3'-phosphoadenosine 5'-phosphosulphate and PNP were 625 microM, 5.0 microM and 0.5 microM respectively. However, PNP displayed potent substrate inhibition at concentrations above 1.2 microM. Antibodies raised in rabbits to the pure enzyme detected a single band in rat liver cytosol with a subunit molecular mass of 35,000 Da, as determined by immunoblotting. The anti-(rat Mx-ST) antibodies also reacted with the phenol-sulphating form of human liver phenol sulphotransferase, suggesting some structural similarity between these proteins. Images Fig. 5. Fig. 6. Fig. 7. PMID:2241904

  5. Liver tumor promoting effects of fenbendazole in rats.

    Science.gov (United States)

    Shoda, T; Onodera, H; Takeda, M; Uneyama, C; Imazawa, T; Takegawa, K; Yasuhara, K; Watanabe, T; Hirose, M; Mitsumori, K

    1999-01-01

    In order to examine whether fenbendazole has tumor-promoting activity, a total of 70 male Fischer 344 rats were initiated with a single intraperitoneal injection of 100 mg/kg of diethylnitrosamine (DEN) or were given the saline vehicle alone; beginning 1 wk later, rats were given a diet containing 3,600; 1,800; 600; 200; 70; or 0 ppm of fenbendazole for 8 wk. Subgroups of 5 rats each from the DEN+ 1,800; DEN+0; 1,800; and 0 ppm groups were euthanatized after 1 wk of fenbendazole treatment, and the remaining animals were euthanatized at 8 wk. After 1 wk, relative liver weights (ratios to body weights) were significantly increased in the DEN+ 1,800 and 1,800 ppm groups, and based on light microscopy, periportal hepatocellular hypertrophy was evident in these groups. After 8 wk, relative liver weights were significantly increased in the groups given > or =600 ppm with or without DEN initiation. Periportal hepatocellular hypertrophy, characterized by a marked increase in smooth endoplasmic reticulum, was observed in the groups given > or =600 ppm with or without DEN initiation. Induction of cytochrome P-450 (CYP) 1A2, 2B1, or 4A1 was noted in the fenbendazole-treated groups with or without DEN initiation; that associated with CYP 1A2 was most marked. Positive immunostaining for anti-CYP 1A1/2 or CYP 2B1/2 was observed diffusely in the livers of animals in the DEN+1,800 and DEN+3,600 ppm groups. The numbers and areas of connexin 32 (Cx32)-positive spots per square centimeter in centrilobular hepatocytes were significantly decreased in an almost dose-dependent manner with fenbendazole treatment after DEN initiation. In situ hybridization for Cx32 mRNA revealed a remarkable decrease in its expression in the centrilobular hepatocytes in the DEN+70 ppm group. The numbers of glutathione S-transferase placental-form positive single cells (plus mini foci) were significantly increased in the DEN+ 1,800 and DEN+3,600 ppm groups. Since those agents that induce CYP 2B1/2 isozymes

  6. Interaction of sulfur mustard with rat liver salt fractionated chromatin.

    Science.gov (United States)

    Jafari, Mahvash; Nateghi, M; Rabbani, A

    2010-01-01

    In this study, the interaction of an alkylating agent, sulfur mustard (SM) with rat liver active (S1 and S2) and inactive (P2) chromatin was investigated employing UV/vis spectroscopy and gel electrophoreses. The results show that SM affects the chromatin structure in a dose-dependent manner. The binding of SM to fractions is different. At lower concentrations (<500 microM), SM seems to unfold the structure and at higher concentrations, it induces aggregation and condensation of chromatin possibly via forming cross-links between the chromatin components. The extent of condensation in S2 is higher when compared to the P2 fraction.

  7. Corticosteroids increase superoxide anion production by rat liver microsomes.

    Science.gov (United States)

    Nelson, D H; Ruhmann-Wennhold, A

    1975-01-01

    Superoxide anion production by liver microsomes from intact, adrenalectomized, and cortisoltreated adrenalectomized rats has been determined. The amount formed was roughly proportionate to the amount of cortisol given, and a similar response was seen in the activity of NADPH-cytochrome c reductase. The amount of measurable superoxide anion was markedly reduced by the addition of superoxide dismutase. The increased production of this potent free radical with cortisol therapy suggests that its formation may contribute to some of the harmful effects of corticosteroids given in more than physiologic amounts. PMID:239969

  8. Metabolism of 3-methylcholanthrene by rat liver microsomes: a reinvestigation

    Energy Technology Data Exchange (ETDEWEB)

    Stoming, T.A. (Medical Coll., Augusta, GA); Bornstein, W.; Bresnick, E.

    1977-01-01

    Metabolites of 3-methylcholanthrene (3-MC) formed by rat liver microsomes were analyzed by high pressure liquid chromatography. The metabolic profile is significantly different from previous studies using thin layer chromatography. The major metabolites include 1- and 2-hydroxy-3-MC. Use of the high pressure liquid chromatographic system allows for the separation of at least seven new metabolites. The amounts of three of these new metabolites are substantially decreased when the potent epoxide hydrase inhibitor 3,3,3-trichloropropene oxide is added to the incubation system. These results then suggest the formation of epoxides of 3-methylcholanthrene other than the K-region oxide.

  9. Effect of acute adrenalectomy on rat liver glucocorticoid receptor

    Directory of Open Access Journals (Sweden)

    Isenović Esma R.

    2006-01-01

    Full Text Available In order to improve current clinical treatment of human hypocortisolism, it is necessary to understand molecular aspects of this pathophysiology. In this study liver tissues from male Wistar rats were used as an experimental model to study structural and functional properties of glucocorticoid receptor (GR in the absence of glucocorticoid hormones (GC. Results show that acute adrenalectomy (ADX significantly increases the number of GR binding sites and GR protein content. In addition, acute ADX stimulates increase in stability of the GR, decrease in stability of the glucocorticoid- receptor complex (G-R, and changes in accumulation of the G-R complex in nuclei and its cellular distribution. .

  10. Loss and recovery of liver regeneration in rats with fulminant hepatic failure.

    Science.gov (United States)

    Eguchi, S; Lilja, H; Hewitt, W R; Middleton, Y; Demetriou, A A; Rozga, J

    1997-10-01

    We earlier described a model of fulminant hepatic failure (FHF) in the rat where partial hepatectomy is combined with induction of right liver lobes necrosis. After this procedure, lack of regenerative response in the residual viable liver tissue (omental lobes) was associated with elevated plasma hepatocyte growth factor (HGF) and transforming growth factor beta (TGF-beta1) levels and delayed expression of HGF and c-met mRNA in the remnant liver. Here, we investigated whether syngeneic isolated hepatocytes transplanted in the spleen will prolong survival and facilitate liver regeneration in FHF rats. Inbred male Lewis rats were used. Group I rats (n = 46) received intrasplenic injection of 2 x 10(7) hepatocytes and 2 days later FHF was induced. Group II FHF rats (n = 46) received intrasplenic injection of saline. Rats undergoing partial hepatectomy of 68% (PH; n = 30) and a sham operation (SO; n = 30) served as controls. In 20 FHF rats (10 rats/group), survival time was determined. The remaining 72 FHF rats (36 rats/group) were used for physiologic studies (liver function and regeneration and plasma growth factor levels). In Group I rats survival was longer than that of Group II controls (73 +/- 22 hr vs. 33 +/- 9 hr; P ammonia, lactate, total bilirubin, PT, and PTT values, lower activity of liver enzymes, and higher monoethylglycinexylidide (MEGX) production than Group II rats. In Group I rats, livers increased in weight at a rate similar to that seen in PH controls and showed distinct mitotic and DNA synthetic activity (incorporation of bromodeoxyuridine and proliferation cell nuclear antigen expression). Plasma HGF and TGF-beta1 levels in these rats decreased and followed the pattern seen in PH rats; additionally, c-met expression in the remnant liver was accelerated. Hepatocyte transplantation prolonged survival in FHF rats and facilitated liver regeneration. Even though the remnant liver increased in weight four times reaching 30% of the original liver mass

  11. Purification of fetal liver stem/progenitor cells containing all the repopulation potential for normal adult rat liver

    DEFF Research Database (Denmark)

    Oertel, Michael; Menthena, Anuradha; Chen, Yuan-Qing

    2008-01-01

    and characteristic properties in vitro and their proliferative and differentiation potential in vivo after transplantation into normal adult rat liver. RESULTS: Rat ED14 FLSPC were purified to 95% homogeneity and exhibited cell culture and gene expression characteristics expected for hepatic stem/progenitor cells...

  12. Antioxidant and Hepatoprotective Properties of Tofu (Curdle Soymilk against Acetaminophen-Induced Liver Damage in Rats

    Directory of Open Access Journals (Sweden)

    Ndatsu Yakubu

    2013-01-01

    Full Text Available The antioxidant and hepatoprotective properties of tofu using acetaminophen to induce liver damage in albino rats were evaluated. Tofus were prepared using calcium chloride, alum, and steep water as coagulants. The polyphenols of tofu were extracted and their antioxidant properties were determined. The weight gain and feed intake of the rats were measured. The analysis of serum alanine aminotransferase (ALT, alkaline phosphatase (ALP, aspartate aminotransferase (AST, and lactate dehydrogenase (LDH activities and the concentrations of albumin, total protein, cholesterol, and bilirubin were analyzed. The result reveals that the antioxidant property of both soluble and bound polyphenolic extracts was significantly higher in all tofus, but the steep water coagulated tofu was recorded higher. Rats fed with various tofus and acetaminophen had their serum ALP, ALT, AST, and LDH activities; total cholesterol; and bilirubin levels significantly (P<0.05 reduced, and total protein and albumin concentrations increased when compared with basal diet and acetaminophen administered group. Therefore, all tofus curdled with various coagulants could be used to prevent liver damage caused by oxidative stress.

  13. Effects of nanoparticle-encapsulated curcumin on arsenic-induced liver toxicity in rats.

    Science.gov (United States)

    Sankar, Palanisamy; Gopal Telang, Avinash; Kalaivanan, Ramya; Karunakaran, Vijayakaran; Manikam, Kesavan; Sarkar, Souvendra Nath

    2015-01-01

    We investigated the therapeutic effectiveness of the nanoparticle-encapsulated curcumin (CUR-NP) against sodium arsenite-induced hepatic oxidative damage in rats. The CUR-NP prepared by emulsion technique was spherical in shape with an encapsulation efficiency of 86.5%. The particle size ranged between 120 and 140 nm with the mean particle size being 130.8 nm. Rats were divided into five groups of six each. Group 1 served as control. Group 2 rats were exposed to sodium arsenite (25 ppm) daily through drinking water for 42 days. Groups 3, 4, and 5 were treated with arsenic as in group 2, however, they were administered, empty nanoparticles, curcumin (100 mg/kg bw) and CUR-NP (100 mg/kg bw), respectively, by oral gavage during the last 14 days of arsenic exposure. Arsenic increased the activities of serum alanine aminotransferase and aspartate aminotransferase and caused histological alterations in liver indicating hepatotoxicity. Arsenic increased lipid peroxidation, depleted reduced glutathione and decreased the activities of superoxide dismutase, catalase, glutathione peroxidase and glutathione reductase in liver. All these effects of arsenic were attenuated with both curcumin and CUR-NP. However, the magnitude of amelioration was more pronounced with CUR-NP. The results indicate that curcumin given in nano-encapsulated form caused better amelioration than free curcumin. © 2013 Wiley Periodicals, Inc. Environ Toxicol 30: 628-637, 2015.

  14. Mistletoe alkali inhibits peroxidation in rat liver and kidney

    Institute of Scientific and Technical Information of China (English)

    Zheng-Ming Shi; Ping Feng; Dong-Qiao Jiang; Xue-Jiang Wang

    2006-01-01

    AIM: To explore the antioxidant and free radical scavenger properties of mistletoe alkali (MA).METHODS: The antioxidant effect of mistletoe alkali on the oxidative stress induced by carbon tetrachloride (CCl4) in rats was investigated. The rats were divided into four groups (n = 8): CCl4-treated group (1 mL/kg body weight), MA -treated group (90 mg/kg), CCl4+MA-treated group and normal control group. After 4 wk of treatment,the level of malondialdehyde (MDA), a lipid peroxidation product (LPO) was measured in serum and homogenates of liver and kidney. Also, the level of glutathione (GSH),and activities of glutathione reductase (GR), glutathione peroxidase (GSPx), superoxide dismutase (SOD), and glutathione-S-transferase (GST) in liver and kidney were determined. Scavenging effects on hydroxyl free radicals produced in vitro by Fenton reaction were studied by ESR methods using 5,5-dimethyl-1-pyrroline-N-oxidesource. Urinary 8-hydroxydeoxyguanosine (8-OHdG) was determined by competitive ELISA.RESULTS: In CCl4-treated group, the level of LPO in serum of liver and kidney was significantly increased compared to controls. The levels of GSH and enzyme activities of SOD, GSPx and GR in liver and kidney were significantly decreased in comparison with controls. In CCl4+MA-treated group, the changes in the levels of LPO in serum of liver and kidney were not statistically significant compared to controls. The levels of SOD, GSPx and GR in liver and kidney were significantly increased in comparison with controls. There was a significant difference in urinary excretion of 8-OHdG between the CCl4-treated and MA-treated groups.CONCLUSION: Oxidative stress may be a major mechanism for the toxicity of CCl4. MA has a protective www.wjgnet.comeffect against CCl4 toxicity by inhibiting the oxidative damage and stimulating GST activities. Thus, clinical application of MA should be considered in cases with carbon tetrachloride-induced injury.

  15. Subchronic Toxicity of Lanthanum Nitrate on Liver in Rats

    Institute of Scientific and Technical Information of China (English)

    刘颖; 陈东; 陈爱军; 刘渤; 孙淑艳; 聂毓秀

    2002-01-01

    Young Wistar rats were divided into six groups,the experimental groups were given La(NO3)3 at dose of 20,10,2,0.2,0.1 mg*kg-1 and the control group was given physiological saline respectively for six months. The animalswere weighed and the ratios of the liver to body weight were counted. Pathological changes of liver were observed by light microscope and transmission electron microscope. Glutamic-oxalacetic transaminase(GOT), glutamic-pyruvic transaminase (GPT),gamma-glutamyl transferase(γ-GT) and alkline phosphatase(ALP) in the serum were measured. The results indicate that the body weight of animals gaines slowly in the group of 20 mg*kg-1 La(NO3)3, but it gained quickly in the rats fed with 0.1 mg*kg-1 La(NO3)3. Biochemical indexes have no abnormal changes. In the group of 20 mg*kg-1 La(NO3)3, there were lipid droplets and decrease of glycogen in the hepatocytes, denser matrix of the mitochondria, deformation of the nuclei of some hepatocytes to different degree and infiltration of inflammatory cells at portal area. The more the dose of La(NO3)3 were given to the rats, the more the number of bodies containing highly electronic dense gravel-like granules and the secondary lysosomes with dense bodies. The rats fed with 20 mg*kg-1 La(NO3)3 for six months shows injurious effects on the hepatocytes.

  16. Treatment with L-valine ameliorates liver fibrosis and restores thrombopoiesis in rats exposed to carbon tetrachloride.

    Science.gov (United States)

    Nakanishi, Chikashi; Doi, Hideyuki; Katsura, Kazunori; Satomi, Susumu

    2010-06-01

    It has been reported that treatment with branched chain amino acids (BCAAs) increases the survival rates in cirrhotic patients. In this study, we investigated the effect of L-valine, one of BCAAs, on liver fibrosis in rat. To induce liver fibrosis, male Wistar rats were injected carbon tetrachloride (CCl(4)) intraperitoneally (2.0 mL/kg) twice a week for 12 weeks. The rats (seven to fifteen rats for each group) were then administered 1.688 g/kg/day of L-valine intravenously for 7 days or 10% amino acid preparation that provided the same amount of nitrogen. Seven days after the last administration, blood platelet counts and bone marrow megakaryocyte counts were significantly higher in the valine group than in the control group (131.2 +/- 38.3 vs. 106.3 +/- 14.5 x 10(4)/microL, p = 0.04; 18.0 +/- 2.1 vs. 13.5 +/- 2.2 per field, p valine group than the control group. Furthermore, hepatic fibrosis was significantly reduced in the valine group, and the mRNA levels of factors associated with liver fibrosis such as procollagen alpha1(III), transforming growth factor-beta1 and connective tissue growth factor were significantly lower in the liver of the valine group 10 days after the last administration. These results indicate that L-valine treatment ameliorates liver fibrosis and restores thrombopoiesis in rats exposed to CCl(4). Therefore, L-valine supplementation may be helpful for patients with liver cirrhosis.

  17. Fluoranthene metabolism: Human and rat liver microsomes display different stereoselective formation of the trans-2,3-dihydrodiol

    Energy Technology Data Exchange (ETDEWEB)

    Day, B.W.; Sahali, Y.; Hutchins, D.A.; Wildschuette, M.P.; Pastorelli, R.; Nguyen, T.T.; Naylor, S.; Skipper, P.L.; Wishnok, J.S.; Tannenbaum, S.R. (Univ. of Pittsburgh, PA (United States))

    1992-11-01

    The metabolism of the environmental carcinogen fluoroanthene by human liver microsomes was compared to that by liver microsomes from rats treated with Aroclor 1254. Although the human-derived system gave primarily one product, similar metabolites were noted from each system. Enantiomers of the major metabolic product, in both cases the trans-2,3-dihydrodiol, were separated by chiral stationary-phase chromatography. Absolute configurations were assigned by application of the benzoate exciton chirality rules to the CD spectra of the 4-(dimethylamino)benzoyl esters. Liver microsomes from Aroclor 1254-treated rats produced the R,R enantiomer of the diol in 75-78% enantiomeric excess, while human liver microsomes produced this enantiomer in only 6-12% excess. The activities of these enantiomers were compared in Salmonella typhimurium strain TM677 mutagenicity assays employing the 9000g supernatant of Aroclor 1254-induced rat liver homogenates. Both the syn- and anti-2,3-dihydrodiol 1,10b-epoxides, which had only been inferred to be metabolites in previous studies, were isolated from the microsomal incubations by preparative reverse-phase HPLC. The evident exceptional aqueous stabilities of these diol epoxides were further examined by half-life determination experiments. Their tetrahydrotetrol hydrolysis products were also noted in the metabolite HPLC profiles. The structures of the tetrahydrotetrols were confirmed by total synthesis.

  18. Rat liver contains a limited number of binding sites for hepatic lipase

    NARCIS (Netherlands)

    G.C. Schoonderwoerd (Kees); A.J.M. Verhoeven (Adrie); H. Jansen (Hans)

    1994-01-01

    textabstractThe binding of hepatic lipase to rat liver was studied in an ex vivo perfusion model. The livers were perfused with media containing partially purified rat hepatic lipase or bovine milk lipoprotein lipase. The activity of the enzymes was determined in the pe

  19. Effects of Traditional Chinese Medicine Preparations on Rat CYP3A4 of Liver Microsomes in Vitro%大鼠肝微粒体法测定3种中药对CYP3A4亚型的作用

    Institute of Scientific and Technical Information of China (English)

    刘艳; 王海霞; 黄丽军; 张一飞; 徐静; 田玮

    2011-01-01

    目的 建立肝微粒体测定法,观察中药制剂对CYP3A4 亚型的作用.方法 取大鼠肝脏,制备肝微粒体,分别优化肝微粒体体外温孵系统的反应时间、蛋白浓度及探针药物咪达唑仑的浓度;高效液相色谱-质谱联用(HPLC-MS-MS)法测定大鼠肝微粒体中咪达唑仑的浓度,计算咪达唑仑的活性;在肝微粒体体外温孵系统中分别加入不同浓度的血脂康胶囊、通心络胶囊、枣仁安神胶囊内容物及对照药物酮康唑,测定其半数抑制浓度(IC50)及抑制常数(Ki).结果 肝微粒体体外温孵系统的反应条件为0.4 g·L-1大鼠肝微粒体,4 μmol·L-1咪达唑仑溶液,37 ℃温育5 min.酮康唑、血脂康胶囊、通心络胶囊的IC50分别为(3.4±0.2),(25.1±0.3),(56.2±0.3) mg·L-1,枣仁安神胶囊的IC50﹥150 mg·L-1;酮康唑、血脂康胶囊、通心络胶囊的Ki分别为(1.7±0.1),(25.0±0.2),(50.0±0.3) mg·L-1.结论 建立了中药制剂对CYP3A4亚型作用的大鼠肝微粒体研究模型.血脂康胶囊和通心络胶囊对大鼠CYP3A4亚型有较弱的抑制作用.%Objective To investigate the influence of traditional Chinese medicine preparations on rat liver CYP 3A4 activity in vitro. Methods The rat liver microsomes were prepared from rat livers. The reaction time, protein content and midazolam concentration in the microsomal incubation was optimalized respectively ; the metabolism of midazolam and activity were measured by HPLC-MS-MS;IC50 and Ki of ketoconazole , xuezhikang ,tongxinluo and zaoren ansheng capsule in microsomal incubated system were determined after incubation with the midazolam ( CYP3A4 ). Results The optimum protein content of rat liver microsomes for kinetic analysis was 0.4 g·L-1 with 4 [junol· L midazolam at 37 ℃ for incubation up to 5 min. The IC50 of ketoconazole, xuezhikang and tongxinluo was (3.4±0.2) ,(25.l±0.3) , (56.2±0.3) mg» L ,respectively,but the IC50 of zaoren ansheng capsule was greater than 150 mg · L

  20. Effective Prevention of Liver Fibrosis by Liver-targeted Hydrodynamic Gene Delivery of Matrix Metalloproteinase-13 in a Rat Liver Fibrosis Model

    Directory of Open Access Journals (Sweden)

    Hiroyuki Abe

    2016-01-01

    Full Text Available Liver fibrosis is the final stage of liver diseases that lead to liver failure and cancer. While various diagnostic methods, including the use of serum marker, have been established, no standard therapy has been developed. The objective of this study was to assess the approach of overexpressing matrix metalloproteinase-13 gene (MMP13 in rat liver to prevent liver fibrosis progression. A rat liver fibrosis model was established by ligating the bile duct, followed by liver-targeted hydrodynamic gene delivery of a MMP13 expression vector, containing a CAG promoter-MMP13-IRES-tdTomato-polyA cassette. After 14 days, the serum level of MMP13 peaked at 71.7 pg/ml in MMP13-treated group, whereas the nontreated group only showed a level of ≃5 pg/ml (P < 0.001. These levels were sustained for the next 60 days. The statistically lower level of the hyaluronic acids in treated group versus the nontreated group (P < 0.05 reveals the therapeutic effect of MMP13 overexpression. Quantitative analysis of tissue stained with sirius red showed a statistically larger volume of fibrotic tissue in the nontreated group compared to that of MMP13-treated rats (P < 0.05. These results suggest that the liver-targeted hydrodynamic delivery of MMP13 gene could be effective in the prevention of liver fibrosis.

  1. The transport of sulphate and sulphite in rat liver mitochondria.

    Science.gov (United States)

    Crompton, M; Palmieri, F; Capano, M; Quagliariello, E

    1974-07-01

    1. The mechanism of sulphite and sulphate permeation into rat liver mitochondria was investigated. 2. Extramitochondrial sulphite and sulphate elicit efflux of intramitochondrial phosphate, malate, succinate and malonate. The sulphate-dependent effluxes and the sulphite-dependent efflux of dicarboxylate anions are inhibited by butylmalonate, phenylsuccinate and mersalyl. Inhibition of the phosphate efflux produced by sulphite is caused by mersalyl alone and by N-ethylmaleimide and butylmalonate when present together. 3. External sulphite and sulphate cause efflux of intramitochondrial sulphate, and this is inhibited by butylmalonate, phenylsuccinate and mersalyl. 4. External sulphite and sulphate do not cause efflux of oxoglutarate or citrate. 5. Mitochondria swell when suspended in an iso-osmotic solution of ammonium sulphite; this is not inhibited by N-ethylmaleimide or mersalyl. 6. Low concentrations of sulphite, but not sulphate, produce mitochondrial swelling in iso-osmotic solutions of ammonium malate, succinate, malonate, sulphate, or phosphate in the presence of N-ethylmaleimide. 7. It is concluded that both sulphite and sulphate may be transported by the dicarboxylate carrier of rat liver mitochondria and also that sulphite may permeate by an additional mechanism; the latter may involve the permeation of sulphurous acid or SO(2) or an exchange of the sulphite anion for hydroxyl ion(s).

  2. Effects ofSalmonella infection on hepatic damage following acute liver injury in rats

    Institute of Scientific and Technical Information of China (English)

    Yong-Tao Li; Cheng-Bo Yu; Dong Yan; Jian-Rong Huang; Lan-Juan Li

    2016-01-01

    BACKGROUND: Acute liver injury is a common clinical disor-der associated with intestinal barrier injury and disturbance of intestinal microbiota. Probiotic supplementation has been reported to reduce liver injury; however, it is unclear whether enteropathogen infection exacerbates liver injury. The pur-pose of this study was to address this unanswered question using a rat model. METHODS: Oral supplementation withSalmonella enterica serovar enteritidis (S. enteritidis) was given to rats for 7 days. Different degrees of acute liver injury were then induced by intraperitoneal injection of D-galactosamine. The presence and extent of liver injury was assayed by measuring the con-centrations of serum alanine aminotransferase, aspartate aminotransferase, and total bilirubin. Histology was used to observe liver tissue damage. Additionally, we measured the changes in plasma endotoxin, serum cytokines and bacterial translocation to clarify the mechanisms underlying intestinal microbiota associated liver injury. RESULTS: The levels of liver damage and endotoxin were sig-niifcantly increased in theSalmonella infected rats with severe liver injury compared with the no infection rats with severe liver injury (P CONCLUSIONS: OralS. enteritidis administration exacer-bates acute liver injury, especially when injury was severe. Major factors of the exacerbation include inlfammatory and oxidative stress injuries induced by the translocated bacteria and associated endotoxins, as well as over-activation of the immune system in the intestine and liver.

  3. Effects of adenoviral-mediated hepatocyte growth factor on liver regeneration after massive hepatectomy in rats

    Directory of Open Access Journals (Sweden)

    Doihara,Hiroyoshi

    2007-04-01

    Full Text Available Resection is the only curative treatment for liver metastasis of colorectal cancers. Despite the supreme regenerative potential of the liver, major hepatectomy sometimes leads to liver failure, and the limitation of resectable liver volumes makes advanced tumors inoperable. This study was attempted to promote liver regeneration using hepatocyte growth factor (HGF gene transfection by venous-administered adenovirus and to improve the survival of rats after massive hepatectomy. The adenovirus that encodes HGF was administered to rats before 85%-hepatectomy. The administration of HGF gene improved the survival of rats after massive hepatectomy, while the administration of control adenovirus deteriorated their survival. Gene transfection of HGF showed up-regulation of serum HGF, stimulation of hepatocellular proliferation and rapid liver regeneration. Moreover, HGF administration reduced apoptosis of hepatocytes. The administration of HGF gene prevented liver dysfunction after major hepatectomy and may be a new assist for surgery.

  4. A Comparative Study of the Metabolism of 6-Methylbenzo [A] Pyrene and Benzo [A] Pyrene by Rat Liver Microsomes

    Science.gov (United States)

    1984-02-24

    Rat Liver Microsomes Name...pyrena by Rat Liver Microsomes Karen Lee Hamernik, Doctor of Philosophy, 1984 Dissertation directed by: Shan K. Yang, Ph.D., Professor, Department of...Microsomal Enzymes 85 Metabolism of 6-OHMBaP by Rat Liver Microsomes 94 Identification of 6-OHMBaP Metabolites 94 UV absorption spectral analysis

  5. Nesfatin-1 alleviates extrahepatic cholestatic damage of liver in rats

    Directory of Open Access Journals (Sweden)

    Ali Solmaz

    2016-11-01

    Full Text Available Obstructive jaundice (OJ can be defined as cessation of bile flow into the small intestine due to benign or malignant changes. Nesfatin-1, recently discovered anorexigenic peptide derived from nucleobindin-2 in hypothalamic nuclei, was shown to have anti-inflammatory and antiapoptotic effects. This study is aimed to investigate the therapeutic effects of nesfatin-1 on OJ in rats. Twenty-four adult male Wistar-Hannover rats were randomly assigned to three groups: sham (n = 8, control (n = 8, and nesfatin (n = 8. After bile duct ligation, the study groups were treated with saline or nesfatin-1, for 10 days. Afterward, blood and liver tissue samples were obtained for biochemical analyses, measurement of cytokines, determination of the oxidative DNA damage, DNA fragmentation, and histopathologic analyses. Alanine aminotransferase and gamma-glutamyl transferase levels were decreased after the nesfatin treatment; however, these drops were statistically non-significant compared to control group (p = 0.345, p = 0.114. Malondialdehyde levels decreased significantly in nesfatin group compared to control group (p = 0.032. Decreases in interleukin-6 and tumor necrosis factor-α levels from the liver tissue samples were not statistically significant in nesfatin group compared to control group. The level of oxidative DNA damage was lower in nesfatin group, however this result was not statistically significant (p = 0.75. DNA fragmentation results of all groups were similar. Histopathological examination revealed that there was less neutrophil infiltration, edema, bile duct proliferation, hepatocyte necrosis, basement membrane damage, and parenchymal necrosis in nesfatin compared to control group. The nesfatin-1 treatment could alleviate cholestatic liver damage caused by OJ due to its anti-inflammatory and antioxidant effects.

  6. The histopathological effects of salvia officinalis on the kidney and liver of rats

    Directory of Open Access Journals (Sweden)

    D.A. Adekomi

    2013-03-01

    Full Text Available The aim of this investigation was to evaluate some of the effects of aqueous leaf extract of Salvia officinalis on the kidney and liver of male Sprague Dawley rats. Ten Sprague-Dawley rats (7-11 weeks old were randomly assigned into two groups; A and B. Aqueous extract of S. officinalis leaves (300 mg/kg body weight was administered orally to the rats in group B while the rats in group A received equal volume of normal saline for 14d. At termination of treatment, the histopathology of the kidney and liver were assessed. The kidney and the liver in the extract treated rat displayed organized and preserved histological profile. Our findings suggest that S. officinalis has no deleterious effects on the kidney and liver of the rats.  

  7. Catabolism of amino acids in livers from cafeteria-fed rats.

    Science.gov (United States)

    de Castro Ghizoni, Cristiane Vizioli; Gasparin, Fabiana Rodrigues Silva; Júnior, Antonio Sueiti Maeda; Carreño, Fernando Olinto; Constantin, Rodrigo Polimeni; Bracht, Adelar; Ishii Iwamoto, Emy Luiza; Constantin, Jorgete

    2013-01-01

    Most studies using a hypercaloric diet to induce obesity have focused on the metabolism of fat and carbohydrates. Less concern has been given to the metabolism of amino acids, despite evidence of modifications in nitrogen metabolism during obesity. The aim of this study was to evaluate amino acid metabolism in livers from cafeteria diet-induced obese rats. Blood parameters were analysed, and histological sections of livers were stained with Sudan III. The enzymatic activities of some enzymes were determined in liver homogenates. Gluconeogenesis, ureagenesis, and oxygen consumption were evaluated in rat livers perfused with glutamine, alanine, or ammonium chloride. Compared to control rats, cafeteria-fed rats demonstrated higher levels of triacylglycerol and glucose in the blood and greater accumulation of fat in livers. Gluconeogenesis and urea production in livers perfused with glutamine and alanine at higher concentrations showed a substantial reduction in cafeteria-fed rats. However, no significant difference was observed among groups perfused with ammonium chloride. The activities of the enzymes alanine aminotransferase, glutaminase, and aspartate aminotransferase in the livers were reduced in cafeteria-fed rats. Taken together, these data are consistent with the hypothesis that livers from cafeteria diet-induced obese rats exhibit a limitation in their maximal capacity to metabolise glutamine and alanine to glucose, ammonia, and urea, not because of an impairment in gluconeogenesis and/or ureagenesis, but rather due to a depression in the activities of enzymes that catalyse the initial steps of amino acid metabolism.

  8. Uptake of dodecanedioic acid by isolated rat liver.

    Science.gov (United States)

    Greco, A V; Mingrone, G; De Gaetano, A; Amigo, L; Puglielli, L; Castagneto, M; Nervi, F

    1997-02-17

    The uptake of dodecanedioic acid (C12); a dicarboxylic acid with 12 carbon atoms, was studied in the isolated perfused rat liver. Fifty mumol of C12 were injected as a bolus into the perfusing liver solution. The concentration of C12 in perfusate samples taken over 2 h from the beginning of the experiments were analyzed by high performance liquid chromatography. An in vitro experimental session was performed to determine the binding curve of C12 to defatted bovine serum albumin. These data were then used to compute the perfusate C12 free fraction. The number of binding sites on the albumin molecule was equal to 4.29 +/- 0.21 (S.E.), while the affinity constant was 6.33 +/- 0.87 x 10(3). M-1. Experimental values of perfusate C12 concentration versus time were individually plotted and fitted to a monoexponential decay for each liver perfused. The predicted C12 concentration at time zero averaged 0.354 +/- 0.0375 mumol/ml. Prom this value the apparent volume of distribution of C12 was obtained and corresponded to 153.02 +/- 14.56 ml. The disappearance rate constant from the perfusate was 0.0278 +/- 0.0030 min-1. The C12 half life was 26.6 +/- 2.3 min. The mean hepatic clearance from the perfusate was 4.08 +/- 0.38 ml/min. In conclusion, C12 is quickly taken up by the liver so that in about 100 min it was completely cleared from the perfusate.

  9. Influence of dietary fish proteins on plasma and liver cholesterol concentrations in rats.

    Science.gov (United States)

    Zhang, X; Beynen, A C

    1993-05-01

    The effects of amount and type of dietary fish proteins on plasma and liver cholesterol concentrations were evaluated in female rats. The isonitrogenous diets used contained 10 g cholesterol/kg and were carefully balanced for residual fat, cholesterol, Ca, Mg and P in the protein preparations. Cod meal, soya-bean protein or casein was incorporated into the diets as the only source of dietary protein at three levels: either 24, 48 or 72 g N/kg diet. Extra protein was added to the diet at the expense of the glucose component. In a second experiment soya-bean protein, casein, cod meal, whiting meal or plaice meal was added to the diet at a level of 24 g N/kg. When compared with casein, cod meal and soya-bean protein decreased plasma and liver cholesterol concentrations. A further cholesterol-lowering effect was achieved by increasing the proportion of either soya-bean protein or cod meal in the diet. Substitution of casein for glucose did not influence plasma and liver cholesterol concentrations. Plaice meal in the diet produced lower group mean plasma cholesterol concentrations than did whiting meal. In rats fed on the diet containing plaice meal, liver cholesterol concentrations were significantly lower than those in their counterparts fed on either cod meal or whiting meal. The present study demonstrates that different fish proteins in the diet have different effects on cholesterol metabolism and that the cholesterol-influencing properties of cod meal can be enhanced by the incorporation of higher proportions of this protein in the diet.

  10. ON THE MECHANISM OF DRUG HYDROXYLATION IN RAT LIVER MICROSOMES

    Science.gov (United States)

    Orrenius, Sten

    1965-01-01

    The TPNH- and O2-dependent drug hydroxylation system of liver microsomes has been studied using normal rats and rats in which the drug-hydroxylating activity has been enhanced by repeated injections of phenobarbital. The oxidative demethylation of aminopyrine is employed as an assay. Optimal conditions for the assay with regard to the concentrations of TPNH and aminopyrine are established. TPN inhibits the reaction in a competitive manner, similarly to its effect on the microsomal TPNH-cytochrome c reductase. Drug hydroxylation, but not the "TPNH oxidase," TPNH-cytochrome c, -2,6-dichlorophenolindophenol, or -neotetrazolium reductase reaction, or the TPNH-dependent lipid peroxidation, is blocked by carbon monoxide. Microsomes from phenobarbital-treated rats exhibit increased activities of the various TPNH-linked reductase reactions, parallel to the increased drug hydroxylation activity, whereas the "TPNH oxidase" activity does not change appreciably. Measurements with microsomes from drug-treated animals reveal a 1:1:1 stoichiometry of aminopyrine-dependent oxygen uptake, TPNH oxidation, and formaldehyde formation. Attempts to solubilize the drug-hydroxylating enzyme system are also presented. It is concluded that the drug-hydroxylating enzyme system involves the microsomal TPNH-cytochrome c reductase and CO-binding pigment, and a hypothetic reaction scheme accounting for the data presented is proposed. PMID:19866674

  11. Rhinacanthus nasutus Improves the Levels of Liver Carbohydrate, Protein, Glycogen, and Liver Markers in Streptozotocin-Induced Diabetic Rats

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    Pasupuleti Visweswara Rao

    2013-01-01

    Full Text Available The present study was designed to investigate the total carbohydrate, total protein, and glycogen levels in the liver and to measure functional liver markers such as aspartate aminotransferase (AST and alanine aminotransferase (ALT in streptozotocin-(STZ- induced diabetic rats after treatment with methanolic extract of Rhinacanthus nasutus (R. nasutus. The methanolic extract of R. nasutus was orally administered at 200 mg/kg/day while glibenclamide was administered at 50 mg/kg/day. All animals were treated for 30 days before being sacrificed. The amounts of carbohydrate, glycogen, proteins, and liver markers (AST and ALT were measured in the liver tissue of the experimental animals. The levels of carbohydrate, glycogen, and proteins were significantly reduced in the diabetic rats but were augmented considerably after 30 days of R. nasutus treatment. The elevated AST and ALT levels in diabetic rats showed a significant decline after treatment with R. nasutus for 30 days. These results show that the administration of R. nasutus ameliorates the altered levels of carbohydrate, glycogen, proteins, and AST and ALT observed in diabetic rats and indicate that R. nasutus restores overall metabolism and liver function in experimental diabetic rats. In conclusion, the outcomes of the present study support the traditional belief that R. nasutus could ameliorate the diabetic state.

  12. TRANSPLANTATION OF CRYOPRESERVED FETAL LIVER CELLS SEEDED INTO MACROPOROUS ALGINATE-GELATIN SCAFFOLDS IN RATS WITH LIVER FAILURE

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    D. V. Grizay

    2015-01-01

    Full Text Available Aim. To study the therapeutic potential of cryopreserved fetal liver cells seeded into macroporous alginategelatin scaffolds after implantation to omentum of rats with hepatic failure.Materials and methods.Hepatic failure was simulated by administration of 2-acetyl aminofl uorene followed partial hepatectomy. Macroporous alginate-gelatin scaffolds, seeded with allogenic cryopreserved fetal liver cells (FLCs were implanted into rat omentum. To prevent from colonization of host cells scaffolds were coated with alginate gel shell. Serum transaminase activity, levels of albumin and bilirubin as markers of hepatic function were determined during 4 weeks after failure model formation and scaffold implantation. Morphology of liver and scaffolds after implantation were examined histologically. Results. Macroporous alginate-gelatin scaffolds after implantation to healthy rats were colonized by host cells. Additional formation of alginate gel shell around scaffolds prevented the colonization. Implantation of macroporous scaffolds seeded with cryopreserved rat FLCs and additionally coated with alginate gel shell into omentum of rats with hepatic failure resulted in signifi cant improvement of hepatospecifi c parameters of the blood serum and positive changes of liver morphology. The presence of cells with their extracellular matrix within the scaffolds was confi rmed after 4 weeks post implantation.Conclusion. The data above indicate that macroporous alginate-gelatin scaffolds coated with alginate gel shell are promising cell carriers for the development of bioengineered liver equivalents.

  13. Amelioration of liver injury by continuously targeted intervention against TNFRp55 in rats with acute-on-chronic liver failure.

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    Yumin Xu

    Full Text Available BACKGROUND: Acute-on-chronic liver failure (ACLF is an acute deterioration of established liver disease. Blocking the TNF (tumor necrosis factor/TNFR (tumor necrosis factor receptor 1 pathway may reduce hepatocyte apoptosis/necrosis, and subsequently decrease mortality during development of ACLF. We demonstrated that a long-acting TNF antagonist (soluble TNF receptor: IgG Fc [sTNFR:IgG-Fc] prevented/reduced development of acute liver failure by blocking the TNF/TNFR1 (TNFRp55 pathway. However, it is still unclear if sTNFR:IgG-Fc can inhibit hepatocyte damage during development of ACLF. METHODOLOGY: Chronic liver disease (liver fibrosis/cirrhosis was induced in Wistar rats by repeatedly challenging with human serum albumin (HSA, and confirmed by histopathology. ACLF was induced with D-galactosamine (D-GalN/lipopolysaccharide (LPS i.p. in the rats with chronic liver disease. Serum and liver were collected for biochemical, pathological and molecular biological examinations. PRINCIPAL FINDINGS: Reduced mortality was observed in sTNFR:IgG-Fc treated ACLF rats, consistent with reduced interleukin (IL-6 levels in serum and liver, as well as reduced hepatic caspase-3 activity, compared to that of mock treated group. Reduced hepatic damage was confirmed with histopathology in the sTNFR:IgG-Fc treated group, which is consistent with reduced Bcl-2 and Bax, at mRNA and protein levels, but increased hepatocyte proliferation (PCNA. This is also supported by the findings that caspase-3 production was up-regulated significantly in ACLF group compared to the mock treated group. Moreover, up-regulated caspase-3 was inhibited following sTNFR:IgG-Fc treatment. Finally, there was up-regulation of hepatic IL-22R in sTNFR:IgG-Fc treated ACLF rats. CONCLUSIONS: sTNFR:IgG-Fc improved survival rate during development of ACLF via ameliorating liver injury with a potential therapeutic value.

  14. Consecutive en-bloc liver (30%)-pancreas-duodenum-spleen-stomach transplant in Lewis rats.

    Science.gov (United States)

    Yoo, C H; Hong, I C; Lee, S; Nam, S; Bai, S; Kim, K; Pivetti, C D; Niewiadomski, S T; Wolf, P; Gittes, R F

    2003-01-01

    It is well-known that 30% of the remaining liver mass, following partial hepatectomy, regenerates to full original mass within 2 weeks in rats. In order to carry the transplanted rat liver to repeated transplantation, a technique of combining 30% of the liver with the pancreaticoduodenum and spleen transplantation is performed in this consecutive organ transplantation study. Our laboratory observed several 37-month-old transplanted rats by carrying through 2-3 generations, and histological disclosure were made. Because the partial liver transplants did not regenerate after the transplantation with other splanchnic organs, this technique is not so difficult though subsequent surgical maneuvers are needed and the liver histology proved entirely normal in every aspect when followed beyond the rat's life span of 24 months.

  15. Tissue distribution comparison between healthy and fatty liver rats after oral administration of hawthorn leaf extract.

    Science.gov (United States)

    Yin, Jingjing; Qu, Jianguo; Zhang, Wenjie; Lu, Dongrui; Gao, Yucong; Ying, Xixiang; Kang, Tingguo

    2014-05-01

    Hawthorn leaves, a well-known traditional Chinese medicine, have been widely used for treating cardiovascular and fatty liver diseases. The present study aimed to investigate the therapeutic basis treating fatty liver disease by comparing the tissue distribution of six compounds of hawthorn leaf extract (HLE) in fatty liver rats and healthy rats after oral administration at first day, half month and one month, separately. Therefore, a sensitive and specific HPLC method with internal standard was developed and validated to determine chlorogenic acid, vitexin-4''-O-glucoside, vitexin-2''-O-rhamnoside, vitexin, rutin and hyperoside in the tissues including heart, liver, spleen, kidney, stomach and intestine. The results indicated that the six compounds in HLE presented some bioactivity in treating rat fatty liver as the concentrations of the six compounds varied significantly in inter- and intragroup comparisons (healthy and/or fatty liver group).

  16. Dietary conjugated linoleic acid reciprocally modifies ketogenesis and lipid secretion by the rat liver.

    Science.gov (United States)

    Sakono, M; Miyanaga, F; Kawahara, S; Yamauchi, K; Fukuda, N; Watanabe, K; Iwata, T; Sugano, M

    1999-09-01

    The effects of dietary conjugated linoleic acid (CLA) and linoleic acid (LA) on ketone body production and lipid secretion were compared in isolated perfused rat liver. After feeding the 1% CLA diet for 2 wk, the concentration of post-perfused liver cholesterol was significantly reduced by CLA feeding, whereas that of triacylglycerol remained unchanged. Livers from CLA-fed rats produced significantly more ketone bodies; and the ratio of beta-hydroxybutyrate to acetoacetate, an index of mitochondrial redox potential, tended to be consistently higher in the liver perfusate. Conversely, cumulative secretions of triacylglycerol and cholesterol were consistently lower in the livers of rats fed CLA, and the reduction in the latter was statistically significant. Thus dietary CLA appeared to exert its hypolipidemic effect at least in part through an enhanced beta-oxidation of fatty acids at the expense of esterification of fatty acid in the liver.

  17. Study on modified cold storage method of rat livers with self-made HYDsolution

    Institute of Scientific and Technical Information of China (English)

    Bei Sun; Hong Chi Jiang; Hai Quan Qiao; Jin Sheng Sun; Shi Jun Zhu; Xiao Ming Wang

    2000-01-01

    AIM To investigate the effect of cold preservation on rat livers by modified storage method with self-madeHYD solution.METHODS The modified method was that the vascular bed of rat livers was expended with an additional20 mL, 30 mL and 40 mL self-made HYD solution / 100 g liver. After resection of the liver, the extra HYDsolution expressed as % liver weight was entrapped via portal infusion by tying off the supra- and infrahepatic inferior vena cava. According to the amount of extra HYD solution, 40 rats were randomly dividedinto four groups: control group with conventional storage method, 20% group, 30% group and 40% group.The preservation effect of modified storage method was compared with that of conventional storage methodusing isolated perfused rat liver model.RESULTS Bile production and all the indices of hepatic microcirculation including portal perfused pressure, endothelin in the effluent, Trypan blue distribution time and histology in modified method groupswere significantly superior to those in control group (P< 0.05). The liver enzymes in 30% group weremarkedly lower than those in control group (P<0.05). The preservative efficiency of rat liver in 30% groupwas the best among the modified method groups.CONCLUSION The cold preservative efficiency with modified storage method is obviously superior to thatwith conventional storage method. It is suggested that the modified cold storage method is effective and mayhave potential for liver preservation

  18. Differential stability of 28s and 18s rat liver ribosomal ribonucleic acids.

    Science.gov (United States)

    Venkov, P V; Hadjiolov, A A

    1969-10-01

    Rat liver ribosomal RNA (rRNA) free from nuclease contaminants was isolated by a modification of the phenol technique. The 28s and 18s rRNA species were separated by preparative agar-gel electrophoresis. The two rRNA species were heated at different temperatures under various conditions and the amount of undegraded rRNA was determined by analytical agar-gel electrophoresis. The 18s rRNA remained unaltered after heating for up to 10min. at 90 degrees in water, acetate buffer, pH5.0, or phosphate buffer, pH7.0. Under similar or milder conditions 28s rRNA was partially degraded, giving rise to a well-delimited 6s peak and a heterogeneous material located in the zone between 28s and 6s. The dependence of degradation of 28s rRNA on the temperature and the ionic strength of the medium was studied. The greatest extent of degradation of 28s rRNA was observed on heating at 90 degrees in water. It is suggested that the instability of rat liver 28s rRNA is due to two factors: the presence of hidden breaks in the polymer chain and a higher susceptibility of some phosphodiester bonds to thermal hydrolysis.

  19. Decreased immunoreactivity of visfatin in the pancreas and liver of rats with renovascular hypertension.

    Science.gov (United States)

    Piotrowska, Ż; Janiuk, I; Lewandowska, A; Kasacka, I

    2016-01-01

    Hypertension is one of the major endocrine and metabolic disorders, in which visfatin plays a significant role. The objective of this study was to evaluate the immunoreactivity of visfatin in pancreas and liver of “two kidney, one clip” (2K1C) renovascular hypertension model in rats. The studies were carried out on the pancreas and liver of rats. After a 6-week period of the renal artery clipping procedure, 2K1C rats developed a stable hypertension. Paraffin sections were stained with hematoxylin and eosin (for general histological examination) and processed for immunolocalization of visfatin. The intensity of immunohistochemical reaction was measured using Nikon NIS-Elements Advanced Research software. The hypertension significantly weakened the immunohistochemical reaction exhibiting visfatin in the pancreas and liver of hypertensive rats, compared to control animals. The changes induced by hypertension in the visfatin-containing cells in the pancreas and liver of the rats are discussed and needs further study.

  20. In vitro glucuronidation of ochratoxin a by rat liver microsomes.

    Science.gov (United States)

    Han, Zheng; Tangni, Emmanuel K; Di Mavungu, José Diana; Vanhaecke, Lynn; De Saeger, Sarah; Wu, Aibo; Callebaut, Alfons

    2013-12-18

    Ochratoxin A (OTA), one of the most toxic mycotoxins, can contaminate a wide range of food and feedstuff. To date, the data on its conjugates via glucuronidation request clarification and consolidation. In the present study, the combined approaches of ultra high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS), UHPLC-Orbitrap-high resolution mass spectrometry (HRMS) and liquid chromatography-multiple stage mass spectrometry (LC-MS(n)) were utilized to investigate the metabolic profile of OTA in rat liver microsomes. Three conjugated products of OTA corresponding to amino-, phenol- and acyl-glucuronides were identified, and the related structures were confirmed by hydrolysis with β-glucuronidase. Moreover, OTA methyl ester, OTα and OTα-glucuronide were also found in the reaction solution. Based on these results, an in vitro metabolic pathway of OTA has been proposed for the first time.

  1. In Vitro Glucuronidation of Ochratoxin A by Rat Liver Microsomes

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    Zheng Han

    2013-12-01

    Full Text Available Ochratoxin A (OTA, one of the most toxic mycotoxins, can contaminate a wide range of food and feedstuff. To date, the data on its conjugates via glucuronidation request clarification and consolidation. In the present study, the combined approaches of ultra high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS, UHPLC-Orbitrap-high resolution mass spectrometry (HRMS and liquid chromatography-multiple stage mass spectrometry (LC-MSn were utilized to investigate the metabolic profile of OTA in rat liver microsomes. Three conjugated products of OTA corresponding to amino-, phenol- and acyl-glucuronides were identified, and the related structures were confirmed by hydrolysis with β-glucuronidase. Moreover, OTA methyl ester, OTα and OTα-glucuronide were also found in the reaction solution. Based on these results, an in vitro metabolic pathway of OTA has been proposed for the first time.

  2. Salidroside alleviates oxidative stress in the liver with non- alcoholic steatohepatitis in rats.

    Science.gov (United States)

    Yang, Ze-ran; Wang, Hui-fang; Zuo, Tie-cheng; Guan, Li-li; Dai, Ning

    2016-04-14

    Nonalcoholic steatohepatitis (NASH) is characterized by fat accumulation in the hepatocyte, inflammation, liver cell injury, and varying degrees of fibrosis, and can lead to oxidative stress in liver. Here, we investigated whether Salidroside, a natural phenolic antioxidant product, can protect rat from liver injury during NASH. NASH model was established by feeding the male SD rats with high-fat and high-cholesterol diet for 14 weeks. Four groups of male SD rats including, normal diet control group, NASH model group, and Salidroside treatment group with150mg/kg and 300 mg/kg respectively, were studied. Salidroside was given by oral administration to NASH in rats from 9 weeks to 14 weeks. At the end of 14 weeks, liver and serum were harvested, and the liver injury, oxidative stress and histological features were evaluated. NASH rats exhibited significant increases in the following parameters as compared to normal diet control rats: fat droplets with foci of inflammatory cell infiltration in the liver. ALT, AST in serum and TG, TC in hepatocyte elevated. Oxidative responsive genes including CYP2E1 and Nox2 increased. Additionally, NASH model decreased antioxidant enzymes SOD, GSH, GPX, and CAT in the liver due to their rapid depletion after battling against oxidative stress. Compared to NASH model group, treatment rats with Salidroside effectively reduced lipid accumulation, inhibited liver injury in a does-dependent manner. Salidroside treatment restored antioxidant enzyme levels, inhibited expression of CYP2E1 and Nox2 mRNA in liver, which prevented the initial step of generating free radicals from NASH. The data presented here show that oral administration of Salidroside prevented liver injury in the NASH model, likely through exerting antioxidant actions to suppress oxidative stress and the free radical-generating CYP2E1 enzyme, Nox2 in liver.

  3. Effect of the Aqueous Root Extract of Urena lobata (Linn on the Liver of Albino Rat

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    I.Y. Mshelia

    2013-01-01

    Full Text Available The effects of the aqueous root extract of urena lobata on the rat liver was investigated using a total of (25 adult Wister rats of both sexes that were randomly divided into five groups of five rats each. Group I served as the control, while rats in groups II-IV where administered 100, 200 and 300 mg/kg body weight of the extract, respectively for 28 days. Rats in group V were administered 300 mg/kg of the extract for 28 days and allowed to stay for 14 days post treatment to observe for reversibility, persistence or delayed occurrence of toxic effects. At the end of the experimental period the animals were sacrificed and liver weight taken and fixed for routine histological examinations. Administration of the extract to rats had no effects on liver and body weights but the extract caused a decrease in albumin level and increases in the levels of Aspartate Transaminases (AST, Alanine Transaminases (ALT and Alkaline Phosphatase (ALP. Histopathological assessment of the liver revealed mild to severe interstitial hemorrhage, mononuclear cell infiltration, necrosis, congestion and edema in the liver of the treated rats while withdrawal of the extract for 14 days showed a slight degree of recovery in the rats. This findings suggest that the biochemical and morphological organization of the liver can significantly be altered with continues and increase use of the extract, but further studies on the long term effect of the extract and a prolonged recovery period is recommended in further studies.

  4. Apoptosis of rat liver in cold preser vation with custom-designed K YL solution

    Institute of Scientific and Technical Information of China (English)

    Li Li; Chun-Man Li; Bing-Yan Zhang; Ming-Dao Hu; Xiao-Yan Li; Jiang-Hua Ran; Ming Huang

    2007-01-01

    BACKGROUND:A suitable perfusate is very important in reducing various problems in liver preservation, prolonging the time of organ preservation and enhancing the quality of donor tissue. University of Wisconsin (UW) solution is the most successful solution for preserving multiple organs at present, but it has many shortcomings. We set out to develop a new liver preservation solution (KYL solution) and study its effects on apoptosis in rat liver undergoing cold preservation. METHODS: Using non-circulated isolated perfused rat liver (IPRL), we randomly preserved Sprague-Dawley rat livers for 0, 4, 8, 16, 24, and 48 hours with KYL solution or UW solution. The effects were assessed by measuring the content of free radicals in Krebs-Henseleit solution and the intracellular calcium content of hepatocytes, assessing hepatocellular apoptosis and related-gene expression, and observing the morphological changes in liver. To evaluate the protection by KYL and UW solutions in rat liver perfusion and preservation, we chosed normal saline for negative comparison. RESULTS: The intracellular calcium content of the liver preserved in KYL solution was less than that preserved in UW solution. At every different period of preservation, the malonaldehyde and superoxide dismutase content in Krebs-Henseleit solution, the percentage of apoptotic cells and the expression patterns of apoptosis-related-genes were similar in livers preserved in KYL and UW solutions. Morphological changes in the two groups were almost the same. The variables in both groups were better than those of livers preserved in normal saline. Both KYL and UW solutions protected rat liver from ischemia-reperfusion injury. CONCLUSIONS:KYL solution is superior to UW solution in preventing calcium overload. More severe hepatocyte damage may appear in the KYL group than in the UW group and the effect of KYL solution on apoptosis in rat liver preservation is similar to that of UW solution.

  5. Solubilization and characterization of haloperidol-sensitive (+)-( sup 3 H)SKF-10,047 binding sites (sigma sites) from rat liver membranes

    Energy Technology Data Exchange (ETDEWEB)

    McCann, D.J.; Su, T.P. (National Institute on Drug Abuse, Baltimore, MD (USA))

    1991-05-01

    The zwitterionic detergent 3-((3-cholamidopropyl)dimethylamino)-1-propanesulfonate (CHAPS) produced optimal solubilization of (+)-({sup 3}H)SKF-10,047 binding sites from rat liver membranes at a concentration of 0.2%, well below the critical micellular concentration of the detergent. The pharmacological selectivity of the liver (+)-({sup 3}H)SKF-10,047 binding sites corresponds to that of sigma sites from rat and guinea pig brain. When the affinities of 18 different drugs at (+)-({sup 3}H)SKF-10,047 binding sites in membranes and solubilized preparations were compared, a correlation coefficient of 0.99 and a slope of 1.03 were obtained, indicating that the pharmacological selectivity of rat liver sigma sites is retained after solubilization. In addition, the binding of 20 nM ({sup 3}H)progesterone to solubilized rat liver preparations was found to exhibit a pharmacological selectivity appropriate for sigma sites. A stimulatory effect of phenytoin on (+)-({sup 3}H)SKF-10,047 binding to sigma sites persisted after solubilization. When the solubilized preparation was subjected to molecular sizing chromatography, a single peak exhibiting specific (+)-({sup 3}H)SKF-10,047 binding was obtained. The binding activity of this peak was stimulated symmetrically when assays were performed in the presence of 300 microM phenytoin. The molecular weight of the CHAPS-solubilized sigma site complex was estimated to be 450,000 daltons. After solubilization with CHAPS, rat liver sigma sites were enriched to 12 pmol/mg of protein. The present results demonstrate a successful solubilization of sigma sites from rat liver membranes and provide direct evidence that the gonadal steroid progesterone binds to sigma sites. The results also suggest that the anticonvulsant phenytoin binds to an associated allosteric site on the sigma site complex.

  6. Alkaline comet assay in liver and stomach, and micronucleus assay in bone marrow, from rats treated with 2-acetylaminofluorene, azidothymidine, cisplatin, or isobutyraldehyde.

    Science.gov (United States)

    Kraynak, A R; Barnum, J E; Cunningham, C L; Ng, A; Ykoruk, B A; Bennet, B; Stoffregen, D; Merschman, M; Freeland, E; Galloway, S M

    2015-07-01

    As part of the Japanese Center for the Validation of Alternative Methods (JaCVAM) initiative international validation study of the in vivo rat alkaline comet assay (comet assay), we examined the ability of the assay to determine the genotoxicity of 2-acetylaminofluorene (AAF), azidothymidine (AZT), cisplatin (CPN), and isobutyraldehyde (IBA) in liver and glandular stomach of male Sprague-Dawley rats. Rats were given oral doses of test compound or control once daily for three days. High dose levels were approximately maximum tolerated doses and were based on preliminary range-finding studies. Tissues were harvested 3h after the final dose (48h after the initial dose). A bone marrow micronucleus assay (MN) was also conducted on the rats treated with AZT, CPN, and IBA. Acute toxic effects of treatment were determined primarily through histomorphologic analysis of liver and stomach but also by body weight and serum liver enzyme changes. The comet assay was conducted on fresh tissue preparations but frozen samples from two studies were also assayed. Statistically significant dose-related differences in comet % DNA in tail were found in liver and stomach for the genotoxin AZT and in liver for the genotoxin CPN, but not in liver or stomach for the non-genotoxin IBA. Statistically significant differences in % DNA in tail were measured in liver for the low and mid dose of the genotoxin AAF, but not the high dose. The comet assays of frozen liver suspensions from CPN- and AAF-treated rats yielded comparable results to the assays of fresh preparations. There were no indications of significant toxicity induced by any treatment. The micronucleus assay was positive for CPN and AZT and negative for IBA. In conclusion, the in vivo comet assay is capable of detecting genotoxic effects of a variety of chemicals and may fill an important role in the genotoxicity test battery.

  7. Transformations of DHEA and its metabolites by rat liver.

    Science.gov (United States)

    Lardy, Henry; Marwah, Ashok; Marwah, Padma

    2002-12-01

    Because dehydroepiandrosterone (DHEA) has a wide variety of weak beneficial effects in experimental animals and humans, we searched for metabolites of this steroid in the hope of finding more active compounds that might qualify for the title "steroid hormone." Incubation of DHEA with rat liver homogenate fortified with energy-yielding substrates resulted in rapid hydroxylation at the 7alpha-position of the molecule and subsequent conversion to other 7-oxygenated steroids in the sequence DHEA --> 7alpha-hydroxyDHEA --> 7-oxoDHEA --> 7beta-hydroxyDHEA, with branching to diols, triols, and sulfate esters. The ability of these metabolites to induce the formation of liver thermogenic enzyme activity increased from left to right in that sequence. A total of 25 different steroids were characterized, and at least six additional structures that are currently under study were produced from DHEA. 7-OxoDHEA is more effective than DHEA in enhancing memory performance in old mice and in reversing the amnesic effects of scopolamine.

  8. Oxidation of esterified arachidonate by rat liver microsomes

    Energy Technology Data Exchange (ETDEWEB)

    Davis, H.W.; Suzuki, T.; Schenkman, J.B.

    1986-03-05

    The authors have previously demonstrated a relationship between phospholipid arachidonate in liver microsomes and malondialdehyde (MDA) formation during lipid peroxidation. In this study arachidonic acid (U-/sup 14/C) was incorporated into rat liver microsomes and NADPH-supported peroxidation was carried out at 37/sup 0/C for 15 minutes. The microsomes were pelleted by centrifugation and the labeled products in the supernatant were isolated by a solid phase method. Pellets were hydrolyzed with phospholipase A/sub 2/ and extracted with diethyl ether and the products from both fractions were separated by reverse phase HPLC. The results show that (1) oxidation occurs in all of the major phospholipids but that phosphatidylethanolamine is the most susceptible; (2) a linear correlation exists between MDA formation and supernatant radioactivity; (3) several different polar products are found in both the supernatant and the hydrolyzed pellet but that the ratios of product peaks in HPLC do not change during the peroxidation, indicating no secondary metabolism or propagation; and (4) cytochrome P-450 is not involved in the peroxidative reactions since no oxidation occurs in the absence of Fe/sup 3 +/ and since product formation is unaffected in the presence of carbon monoxide.

  9. Thin film voltammetry of metabolic enzymes in rat liver microsomes

    Science.gov (United States)

    Krishnan, Sadagopan; Rusling, James F.

    2007-01-01

    We report herein thin film voltammetry and kinetics of electron transfer for redox proteins in rat liver microsomes for the first time. Films were made layer-by-layer from liver microsomes and polycations on pyrolytic graphite electrodes. Cyclic voltammograms were chemically reversible with a midpoint potential of −0.48 V vs SCE at 0.1 V s−1 in pH 7.0 phosphate buffer. Reduction peak potentials shifted negative at higher scan rates, and oxidation-reduction peak current ratios were ∼1 consistent with non-ideal quasireversible thin film voltammetry. Analysis of oxidation-reduction peak separations gave an average apparent surface electron transfer rate constant of 30 s−1. Absence of significant electrocatalytic reduction of O2 or H2O2 and lack of shift in midpoint potential when CO is added that indicates lack of an iron heme cofactor suggest that peaks can be attributed to oxidoreductases present in the microsomes rather than cytochrome P450 enzymes. PMID:18037986

  10. Disrupted Renal Mitochondrial Homeostasis after Liver Transplantation in Rats.

    Directory of Open Access Journals (Sweden)

    Qinlong Liu

    Full Text Available Suppressed mitochondrial biogenesis (MB contributes to acute kidney injury (AKI after many insults. AKI occurs frequently after liver transplantation (LT and increases mortality. This study investigated whether disrupted mitochondrial homeostasis plays a role in AKI after LT.Livers were explanted from Lewis rats and implanted after 18 h cold storage. Kidney and blood were collected 18 h after LT.In the kidney, oxidative phosphorylation (OXPHOS proteins ATP synthase-β and NADH dehydrogenase-3 decreased 44% and 81%, respectively, with marked reduction in associated mRNAs. Renal PGC-1α, the major regulator of MB, decreased 57% with lower mRNA and increased acetylation, indicating inhibited synthesis and suppressed activation. Mitochondrial transcription factor-A, which controls mtDNA replication and transcription, protein and mRNA decreased 66% and 68%, respectively, which was associated with 64% decreases in mtDNA. Mitochondrial fission proteins Drp-1 and Fis-1 and mitochondrial fusion protein mitofusin-1 all decreased markedly. In contrast, PTEN-induced putative kinase 1 and microtubule-associated protein 1A/1B-light chain 3 increased markedly after LT, indicating enhanced mitophagy. Concurrently, 18- and 13-fold increases in neutrophil gelatinase-associated lipocalin and cleaved caspase-3 occurred in renal tissue. Both serum creatinine and blood urea nitrogen increased >2 fold. Mild to moderate histological changes were observed in the kidney, including loss of brush border, vacuolization of tubular cells in the cortex, cast formation and necrosis in some proximal tubular cells. Finally, myeloperoxidase and ED-1 also increased, indicating inflammation.Suppression of MB, inhibition of mitochondrial fission/fusion and enhancement of mitophagy occur in the kidneys of recipients of liver grafts after long cold storage, which may contribute to the occurrence of AKI and increased mortality after LT.

  11. Rat liver antioxidant response to iron and copper overloads.

    Science.gov (United States)

    Musacco-Sebio, Rosario; Saporito-Magriñá, Christian; Semprine, Jimena; Torti, Horacio; Ferrarotti, Nidia; Castro-Parodi, Mauricio; Damiano, Alicia; Boveris, Alberto; Repetto, Marisa G

    2014-08-01

    The rat liver antioxidant response to Fe and Cu overloads (0-60mg/kg) was studied. Dose- and time-responses were determined and summarized by t1/2 and C50, the time and the liver metal content for half maximal oxidative responses. Liver GSH (reduced glutathione) and GSSG (glutathione disulfide) were determined. The GSH content and the GSH/GSSG ratio markedly decreased after Fe (58-66%) and Cu (79-81%) loads, with t1/2 of 4.0 and 2.0h. The C50 were in a similar range for all the indicators (110-124μgFe/g and 40-50μgCu/g) and suggest a unique free-radical mediated process. Hydrophilic antioxidants markedly decreased after Fe and Cu (60-75%; t1/2: 4.5 and 4.0h). Lipophilic antioxidants were also decreased (30-92%; t1/2: 7.0 and 5.5h) after Fe and Cu. Superoxide dismutase (SOD) activities (Cu,Zn-SOD and Mn-SOD) and protein expression were adaptively increased after metal overloads (Cu,Zn-SOD: t1/2: 8-8.5h and Mn-SOD: t1/2: 8.5-8.0h). Catalase activity was increased after Fe (65%; t1/2: 8.5h) and decreased after Cu (26%; t1/2: 8.0h), whereas catalase expression was increased after Fe and decreased after Cu overloads. Glutathione peroxidase activity decreased after metal loads by 22-39% with a t1/2 of 4.5h and with unchanged protein expression. GSH is the main and fastest responder antioxidant in Fe and Cu overloads. The results indicate that thiol (SH) content and antioxidant enzyme activities are central to the antioxidant defense in the oxidative stress and damage after Fe and Cu overloads.

  12. Vitamin A deficiency causes oxidative damage to liver mitochondria in rats.

    Science.gov (United States)

    Barber, T; Borrás, E; Torres, L; García, C; Cabezuelo, F; Lloret, A; Pallardó, F V; Viña, J R

    2000-07-01

    Mitochondrial damage in rat liver induced by chronic vitamin A-deficiency was studied using three different groups of rats: (i) control rats, (ii) rats fed a vitamin A-free diet until 50 d after birth and (iii) vitamin A-deficient rats re-fed a control diet for 30 d. No statistical difference in body weight and food intake was found between control and vitamin A-deficient rats. Liver GSH concentration was similar in both groups. However, in vitamin A-deficient rats, the mitochondrial GSH/GSSG ratio was significantly lower and the levels of malondialdehyde (MDA) and 8-oxo-7, 8-dihydro-2'-deoxyguanosine (oxo8dG) were higher when compared to control rats. These values were partially restored in re-fed rats. The mitochondrial membrane potential of vitamin A-deficient rats was significantly lower than in control rats and returned to normal levels in restored vitamin A rats. Two populations of mitochondria were found in vitamin A-deficient rats according to the composition of membrane lipids. One population showed a similar pattern to the control mitochondria and the second population had a higher membrane lipid content. This report emphasizes the protective role of vitamin A in liver mitochondria under physiological circumstances.

  13. A study of liver microsomal enzymes in rats following propoxur (Baygon) administration.

    Science.gov (United States)

    Nelson, D L; Lamb, D W; Mihail, F

    1984-08-01

    Groups of rats were given either propoxur, were left as untreated controls, or were given phenobarbital, DDT, chlordane or toxaphene which are known to induce liver microsomal detoxification enzymes. Microsomal enzyme activity was measured by testing the ability of liver homogenates to degrade EPN (O-ethyl O-(4-nitrophenyl) phenylphosphonothioate) to p-nitrophenol. The activity of aminopyrine-N-demethylase, cytochrome P-450 and p-nitroanisole-O-demethylase in liver homogenates of rats receiving propoxur was measured. Liver microsomal detoxification enzymes were not induced by propoxur exposure.

  14. Early changes of graft function, cytokines and superoxide dismutase serum levels after donor liver denervation and Kupffer cell depletion in a rat-to-rat liver transplantation model

    Institute of Scientific and Technical Information of China (English)

    Hong Zhu; Catena Marco; Ferla Gianfranco

    2009-01-01

    BACKGROUND:Hepatic reperfusion injury may cause acute inlfammatory damage, producing signiifcant organ dysfunction, and is an important problem in liver transplantation. This experiment aimed to study early changes of hepatic function after donor liver denervation and Kupffer cell depletion in rat-to-rat liver transplantation and to evaluate the effect of pre-treatment on liver reperfusion injury. METHODS:Donor rats were divided into four groups:control group; group G was pre-treated with gadolinium chloride (G), an inhibitor of Kupffer cells; group H with hexamethonium (H), a sympathetic ganglionic blocking agent; and group HG, with combined H and G pre-treatment. Under the same conditions, serum alanine aminotransferase (ALT), arterial ketone body ratio (AKBR), tumor necrosis factor-alpha (TNF-α), interleukin-6 (IL-6), and superoxide dismutase (SOD) of recipient rats were assessed at 4, 8, 16 and 24 hours after liver transplantation. Histological studies of the grafts were compared. RESULTS:HG pre-treatment signiifcantly decreased ALT, TNF-α, and IL-6 levels, increased AKBR and SOD levels, and demonstrated less pathological damage at 8, 16 and 24 hours compared with the control group. Similar trends were also found in the other groups (G and H). However, the differences among them were not signiifcant at 4 post-operative hours.CONCLUSIONS:Donor denervation and Kupffer cell depletion had preventive effect on liver reperfusion injury. HG pre-treatment is a feasible and reproducible method to protect grafts from reperfusion injury.

  15. Zinc finger protein A20 protects rats against chronic liver allograft dysfunction

    Institute of Scientific and Technical Information of China (English)

    Jie Yang; Ming-Qing Xu; Lu-Nan Yan; Xiao-Bo Chen; Jiao Liu

    2012-01-01

    AIM:To investigate the effect of zinc finger protein A20 on chronic liver allograft dysfunction in rats.METHODS:Allogeneic liver transplantation from DA rats to Lewis rats was performed.Chronic liver allograft dysfunction was induced in the rats by administering low-dose tacrolimus at postoperative day (POD) 5.Hepatic overexpression of A20 was achieved by recombinant adenovirus (rAd.)-mediated gene transfer administered intravenously every 10 d starting from POD 10.The recipient rats were injected with physiological saline,rAdEasy-A20 (1 x 109 pfu/30 g weight) or rAdEasy (1 x 109 pfu/30 g weight) every 10 d through the tail vein for 3 mo starting from POD 10.Liver tissue samples were harvested on POD 30 and POD 60.RESULTS:Liver-transplanted rats treated with only tacrolimus showed chronic allograft dysfunction with severe hepatic fibrosis.A20 overexpression ameliorated the effects on liver function,attenuated liver allograft fibrosis and prolonged the survival of the recipient rats.Treatment with A20 suppressed hepatic protein production of tumor growth factor (TGF)-β1,interleukin1β,caspase-8,CD40,CD40L,intercellular adhesion molecule-1,vascular cell adhesion molecule-1 and E-selectin.A20 treatment suppressed liver cell apoptosis and inhibited nuclear factor-κB activation of Kupffer cells (KCs),liver sinusoidal endothelial cells (LSECs)and hepatic stellate cells (HSCs),and it subsequently decreased cytokine mRNA expression in KCs and LSECs and reduced the production of TGF-β1 in HSCs.CONCLUSION:A20 might prevent chronic liver allograft dysfunction by re-establishing functional homeostasis of KCs,LSECs and HSCs.

  16. Reduced-size orthotopic liver transplantation with different grade steatotic grafts in rats

    Institute of Scientific and Technical Information of China (English)

    叶晟; 韩本立; 董家鸿

    2003-01-01

    Objective To explore the survival time, pathological change and liver regeneration in different kinds of reduced-size liver transplantation in rats using steatotic grafts. Methods Macrovesicular and microvesicular steatotic rat liver models were established by feeding rats with a diet consisting of 79% standard chow, 20% lard and 1% cholesterol for different time periods. With modified two cuff vascular anastomoses and end-to-end sutures on the bile duct, reduced-size orthotopic rat liver transplantations were performed in an attempt to explore the ratio of graft weight to recipient body weight, recipient original liver weight and histological and electron-microscopic findings in comparison with whole rat liver transplantations. Results A one-week survival rates for the rats undergoing whole liver transplantation, and those in the 70% reduced-size orthotopic liver transplantation (ROLT) group, the 60%ROLT group and the 50%ROLT group (grade Ⅰ macrosteatotic grafts) were 91.67%, 75%, 75% and 25%. A 2-week survival rate was 83.33%, 75%, 58.33% and 0 respectively. And their graft recipient body weight (GRBW) values SD were 3.56%±0.36%, 2.53%±0.15%, 2.28%±0.12% and 1.83%±0.16%, respectively. In grade Ⅱ macrosteatotic grafts, the one-week survival rate for those undergoiong whole liver transplantation and those in the 70% ROLT group was 83.33% and 25%. In the microsteatosis grafts for whole liver transplantation, 70% ROLT, 60% ROLT and 50% ROLT, the one-week survival rate was 83.33%, 75%, 75% and 33.33%; and the 2-week survival rate was 75%, 66.67%, 66.67% and 0, respectively. The survival rate of the 50% ROLT group using grade Ⅰ macrosteatotic grafts or grafts mainly with microsteatosis was significantly different from that of other groups. While using macrosteatotic grafts in grade Ⅱ, the 1-week survival rate of the 70% ROLT group was very poor. Pathological findings after operation included liver regeneration and portal space with mild lymphocyte

  17. Influence of zinc sulfate intake on acute ethanol-induced liver injury in rats

    Institute of Scientific and Technical Information of China (English)

    Sema Bolkent; Pelin Arda-Pirincci; Sehnaz Bolkent; Refiye Yanardag; Sevim Tunali; Sukriye Yildirim

    2006-01-01

    AIM: To investigate the role of metallothionein and proliferating cell nuclear antigen (PCNA) on the morphological and biochemical effects of zinc sulfate in ethanol-induced liver injury.METHODS: Wistar albino rats were divided into four groups. Group I; intact rats, group Ⅱ; control rats given only zinc, group Ⅲ; animals given absolute ethanol, group Ⅳ; rats given zinc and absolute ethanol.Ethanol-induced injury was produced by the 1 mL of absolute ethanol, administrated by gavage technique to each rat. Animals received 100 mg/kg per day zinc sulfate for 3 d 2 h prior to the administration of absolute ethanol.RESULTS: Increases in metallothionein immunoreactivity in control rats given only zinc and rats given zinc and ethanol were observed. PCNA immunohistochemistry showed that the number of PCNA-positive hepatocytes was increased significantly in the livers of rats administered ethanol + zinc sulfate. Acute ethanol exposure caused degenerative morphological changes in the liver. Blood glutathione levels decreased, serum alkaline phosphatase and aspartate transaminase activities increased in the ethanol group when compared to the control group. Liver glutathione levels were reduced, but lipid peroxidation increased in the livers of the group administered ethanol as compared to the other groups. Administration of zinc sulfate in the ethanol group caused a significant decrease in degenerative changes, lipid peroxidation, and alkaline phosphatase and aspartate transaminase activities, but an increase in liver glutathione.CONCLUSION: Zinc sulfate has a protective effect on ethanol-induced liver injury. In addition, cell proliferation may be related to the increase in metallothionein immunoreactivity in the livers of rats administered ethanol + zinc sulfate.

  18. Alloxan-Induced Diabetes Causes Morphological and Ultrastructural Changes in Rat Liver that Resemble the Natural History of Chronic Fatty Liver Disease in Humans

    Directory of Open Access Journals (Sweden)

    Amanda Natália Lucchesi

    2015-01-01

    Full Text Available Purpose. This study evaluated the long-term effects of alloxan-induced diabetes in rat liver. Methods. Thirty nondiabetic control rats (NC and 30 untreated diabetic (UD rats were divided into three subgroups sacrificed after 6, 14, or 26 weeks. Clinical and laboratory parameters were assessed. Fresh liver weight and its relationship with body weight were obtained, and liver tissue was analyzed. Results. UD rats showed sustained hyperglycemia, high glycosylated hemoglobin, and low plasma insulin. High serum levels of AST and ALT were observed in UD rats after 2 weeks, but only ALT remained elevated throughout the experiment. Fresh liver weight was equal between NC and UD rats, but the fresh liver weight/body weight ratio was significantly higher in UD rats after 14 and 26 weeks. UD rats showed liver morphological changes characterized by hepatic sinusoidal enlargement and micro- and macrovesicular hepatocyte fatty degeneration with progressive liver structure loss, steatohepatitis, and periportal fibrosis. Ultrastructural changes of hepatocytes, such as a decrease in the number of intracytoplasmic organelles and degeneration of mitochondria, rough endoplasmic reticulum, and nuclei, were also observed. Conclusion. Alloxan-induced diabetes triggered liver morphological and ultrastructural changes that closely resembled human disease, ranging from steatosis to steatohepatitis and liver fibrosis.

  19. Separation of 1-acylglycerolphosphate acyltransferase and 1-acylglycerolphosphorylcholine acyltransferase of rat liver microsomes.

    Science.gov (United States)

    Yamashita, S; Nakaya, N; Miki, Y; Numa, S

    1975-01-01

    1-Acylglycerolphosphate acyltransferase (Ec 2.3.1-) and 1-acylglycerolphosphorylcholine acyltransferase (EC 2.3.1.23) of rat liver microsomes were separated from each other. The separation was achieved by sucrose density gradient centrifugation of the enzyme preparation that was obtained by solubilizing microsomes with a nonionic detergent, Triton X-100, and subjecting the solubilized microsomes to molecular-sieve chromatography. The two acyltransferases are distinguishable from each other also with respect to their stabilities to heat and to Triton X-100. Hence, it is concluded that these acyltransferases are distinct enzymes. These results, together with our previous finding that glycerolphosphate acyltransferase is also a separate enzyme, demonstrate the presence of distinct acyltransferases responsible for the acylation of the different acyl acceptors. Furthermore, the acyl-donor specificities of these acyltransferases provide the enzymatic basis for the nonrandom distribution of fatty acids in naturally occurring glycerolipids. PMID:1054842

  20. Effect of sedimentation through sucrose solutions on the protein-synthesizing ability of rat liver microsomes

    Science.gov (United States)

    Leslie, Ruth A.; Mansbridge, J. N.

    1970-01-01

    1. Centrifugation of the postmitochondrial supernatant of rat liver through 1.0m-sucrose produces particles that have 85–95% less incorporating ability in a cell-free protein-synthesizing system than either ribosomes or microsomes. 2. The incorporation of [14C]phenylalanine into protein by particles prepared by sedimentation through 1.0m-sucrose is stimulated about 20-fold by addition of poly U. 3. The content of rapidly labelled RNA of microsomes is decreased during centrifugation through 1.0m-sucrose. 4. It is suggested that degradation of mRNA occurs during the formation of the pellet in the centrifuge tube as a result of a membrane-bound alkaline ribonuclease, after removal of the ribonuclease inhibitor of the soluble fraction. PMID:5451910

  1. Effects of parsley (Petroselinum crispum) on the liver of diabetic rats: a morphological and biochemical study.

    Science.gov (United States)

    Bolkent, S; Yanardag, R; Ozsoy-Sacan, O; Karabulut-Bulan, O

    2004-12-01

    Parsley is used by diabetics in Turkey to reduce blood glucose. The present study aims to investigate both the morphological and biochemical effects of parsley on liver tissue. Rat hepatocytes were examined by light and electron microscopy. Degenerative changes were observed in the hepatocytes of diabetic rats. These degenerative changes were significantly reduced or absent in the hepatocytes of diabetic rats treated with parsley. Blood glucose levels, alanine transaminase and alkaline phosphatase were observed to be raised in diabetic rats. Diabetic rats treated with parsley demonstrated significantly lower levels of blood glucose, alanine transaminase and alkaline phosphatase. The present study suggests that parsley demonstrates a significant hepatoprotective effect in diabetic rats.

  2. The composition of rat liver microsomes. The structural proteins of rat liver microsomes

    Science.gov (United States)

    Ward, K. A.; Pollak, J. K.

    1969-01-01

    1. The structural-protein component of microsomal membranes was isolated by three separate methods. Analysis by polyacrylamide-gel electrophoresis indicated that the microsomal structural component is made up of a heterogeneous group of proteins. These proteins were further characterized by their phospholipid-binding capacity. The electrophoretic patterns of microsomal structural proteins were found to differ significantly from those of mitochondrial structural proteins. 2. The reticulosomal fraction was also characterized by electrophoresis with reference to total microsomal proteins, microsomal structural proteins and ribosomal proteins. The reticulosomes gave an electrophoretic pattern significantly different from those of the other three preparations examined. It is suggested that reticulosomes consist largely of enzymic proteins of the endoplasmic reticulum. ImagesPLATE 1PLATE 2PLATE 3 PMID:5810063

  3. Positional specificity of saturated and unsaturated fatty acids in phosphatidic acid from rat liver

    NARCIS (Netherlands)

    Possmayer, F.; Scherphof, G.L.; Dubbelman, T.M.A.R.; Golde, L.M.G. van; Deenen, L.L.M. van

    1969-01-01

    1. 1. The relative incorporation of a number of radioactive fatty acids into the different glycerolipids of rat liver microsomes has been investigated. 2. 2. Studies on the distribution of the radioactivity incorporated into phosphatidylcholine, phosphatidylethanolamine and phosphatidic acid showed

  4. Anti-inflammatory liposomes have no impact on liver regeneration in rats

    Directory of Open Access Journals (Sweden)

    Betina Norman Jepsen

    2015-12-01

    Conclusion: Low dose dexamethasone targeted to Kupffer cells does not affect histological liver cell regeneration after 70% hepatectomy in rats, but reduces the inflammatory response judged by circulating markers of inflammation.

  5. Rat liver arginase system under acetaminophen-induced toxic injury and protein deprivation

    Directory of Open Access Journals (Sweden)

    H. P. Kopylchuk

    2017-04-01

    Full Text Available Arginase activity and L-arginine content in both cytosolic and mitochondrial fractions of rat liver cells under the conditions of toxic injury on the background of protein deprivation was studied. The most significant reduction of arginase activity in liver cells and depletion of L-arginine pool was found in rats with toxic acetaminophen-induced liver injury maintained on the ration balanced by all nutrients as well as in protein deficiency rats. It was concluded that reduction of the arginase activity in the cytosolic fraction of rat liver cells, combined with simultaneous decrease of L-arginine content, may be considered as one of the mechanisms of ornithine cycle disturbance. The decline of activity of mitochondrial isoform of arginase II, for certain, is related with activation of NO-synthase system.

  6. Uptake of phosphatidylserine-containing liposomes by liver sinusoidal endothelial cells in the serum-free perfused rat liver

    NARCIS (Netherlands)

    Rothkopf, C; Fahr, A; Fricker, G; Scherphof, GL; Kamps, JAAM

    2005-01-01

    We studied the kinetics of hepatic uptake of liposomes during serum-free recirculating perfusion of rat livers. Liposomes consisted of phosphatidylcholine, cholesterol and phosphatidylserine in a 6:4:0 or a 3:43 molar ratio and were radiolabelled with [H-3]cholesteryl oleyl ether. The negatively cha

  7. Uptake of phosphatidylserine-containing liposomes by liver sinusoidal endothelial cells in the serum-free perfused rat liver

    NARCIS (Netherlands)

    Rothkopf, C; Fahr, A; Fricker, G; Scherphof, GL; Kamps, JAAM

    2005-01-01

    We studied the kinetics of hepatic uptake of liposomes during serum-free recirculating perfusion of rat livers. Liposomes consisted of phosphatidylcholine, cholesterol and phosphatidylserine in a 6:4:0 or a 3:43 molar ratio and were radiolabelled with [H-3]cholesteryl oleyl ether. The negatively cha

  8. Medium chain triglycerides dose-dependently prevent liver pathology in a rat model of non-alcoholic fatty liver disease

    Science.gov (United States)

    Metabolic syndrome is often accompanied by development of hepatic steatosis and less frequently by nonalcoholic fatty liver disease (NAFLD) leading to nonalcoholic steatohepatitis (NASH). Replacement of corn oil with medium chain triacylglycerols (MCT) in the diets of alcohol-fed rats has been show...

  9. Participation of liver progenitor cells in liver regeneration: lack of evidence in the AAF/PH rat model.

    Science.gov (United States)

    Dusabineza, Ange-Clarisse; Van Hul, Noémi K; Abarca-Quinones, Jorge; Starkel, Peter; Najimi, Mustapha; Leclercq, Isabelle A

    2012-01-01

    When hepatocyte proliferation is impaired, liver progenitor cells (LPC) are activated to participate in liver regeneration. We used the 2-acetaminofluorene/partial hepatectomy (AAF/PH) model to evaluate the contribution of LPC to liver cell replacement and function restoration. Fischer rats subjected to AAF/PH (or PH alone) were investigated 7, 10 and 14 days post-hepatectomy. Liver mass recovery (LMR) was estimated, and the liver mass to body weight ratio calculated. We used serum albumin and bilirubin levels, and liver albumin mRNA levels to assess the liver function. LPC expansion was analyzed by cytokeratin 19 (CK19), glutathione S-transferase protein (GSTp) immunohistochemistry and by CK19, CD133, transforming growth factor-β1 and hepatocyte growth factor mRNA expression in livers. Cell proliferation was evaluated by Ki67 and BrdU immunostaining. Compared with PH alone where LMR was ∼100% 14 days post-PH, LMR was defective in AAF/PH rats (64.1±15.5%, P=0.0004). LPC expansion was scarce in PH livers (0.5±0.4% of CK19(+) area), but significant in AAF/PH livers (8.5±7.2% of CK19(+)), and inversely correlated to LMR (r(2)=0.63, PPH animals presented liver failure (low serum albumin and high serum bilirubin) 14 days post-PH. Compared with animals with preserved function, this was associated with a lower LMR (50±6.8 vs 74.6±9.4%, P=0.0005), a decreased liver to body weight ratio (2±0.3 vs 3.5±0.6%, P=0.001), and a larger LPC expansion such as proliferating Ki67(+) LPC covered 17.4±4.2% of the liver parenchyma vs 3.1±1.5%, (Plivers with preserved function. These observations suggest that, in this model, the efficient recovery of the liver function was ensured rather by the proliferation of mature hepatocytes than by the LPC expansion and differentiation into hepatocytes.

  10. Role of liver nerves and adrenal medulla in glucose turnover of running rats

    DEFF Research Database (Denmark)

    Sonne, B; Mikines, K J; Richter, Erik;

    1985-01-01

    Sympathetic control of glucose turnover was studied in rats running 35 min at 21 m X min-1 on the level. The rats were surgically liver denervated, adrenodemedullated, or sham operated. Glucose turnover was measured by primed constant infusion of [3-3H]glucose. At rest, the three groups had ident...... and duration, hepatic glycogenolysis and glucose production are not influenced by the autonomic liver nerves but are enhanced by circulating epinephrine....

  11. Ketogenesis and Malonyl Coenzyme. A Content of Liver from ’Streptococcus pneumoniae’-infected Rats.

    Science.gov (United States)

    1978-11-17

    Malonyl-CoA is a possible regulator of ketogenesis . Since infection partially inhibits starvation ketosis, studies were performed to determine if...malonyl-CoA content was the limiting factor in ketogenesis during an infection. Malonyl-CoA was increased in fed rat liver and decreased in fasted and...fasted-infected rat liver. This suggests that malonyl-CoA content does not regulate ketogenesis during an infection. (Author)

  12. Contribution of mononuclear bone marrow cells to carbon tetrachloride-induced liver fibrosis in rats

    Institute of Scientific and Technical Information of China (English)

    Bao-Qiang Cao; Ji-Zong Lin; Yue-Si Zhong; Shao-Bin Huang; Nan Lin; Zhao-Feng Tang; Rui Chen; Peng Xiang; Rui-Yun Xu

    2007-01-01

    AIM:To study the inhibitory effect of mononuclear bone marrow cell (BMC) transplantation on carbon tetrachloride (CCIt) -induced liver fibrosis in rats.METHODS:Rat liver fibrosis models were induced by CCN and alcohol administration. After 8 wk,twenty rats were randomly allocated into treatment group (n = 10) and control group (n = 10). BMC were infused into the rats in treatment group via the portal vein,while heparinized saline was infused in control group. CCU was hypodermically injected into the rats twice a week for 4 wk. At the end of wk 12,all rats were humanely sacrificed. Liver samples were taken and stained with HE or Masson trichrome. The general conditions,liver fibrSsis (hydroxyproline and collagen fibre) and liver pathological grades in rats were evaluated.± 128.8μg/g in treatment group,and 596.0 ± 341. 8μg/g in control group.The percentage of collagen fibre was 3.75% ± 0.98% in treatment group and 5.02% ± 0.44% in control group.There was a significant difference berween the two groups (P<0.05).Liver pathological grade decreased from grade Ⅳ to grade Ⅲ partially in treatment group (P<0.05) with no obvious improvement in control group (P<0.05).There was a significant difference between treatment group and control group(P<0.05).CONCLUSION: Transplantation of BMC can improve liver fibrosis due to chronic liver injury in rats.

  13. Hepcidin expression in the liver of rats fed a magnesium-deficient diet.

    Science.gov (United States)

    Ishizaki, Natsumi; Kotani, Megumi; Funaba, Masayuki; Matsui, Tohru

    2011-10-01

    Mg deficiency accelerates Fe accumulation in the liver, which may induce various metabolic disturbances. In the present study, we examined the gene expression of Hepcidin, a peptide hormone produced in the liver to regulate intestinal Fe absorption negatively, in Mg-deficient rats. Although liver Fe concentration was significantly higher in rats fed an Mg-deficient diet for 4 weeks than in rats fed a control diet, Hepcidin expression in the liver was comparable between the dietary groups. Previous studies revealed that Fe overload up-regulated Hepcidin expression through transcriptional activation by Fe-induced bone morphogenetic protein (Bmp) 6, a growth/differentiation factor belonging to the transforming growth factor-β family, in the liver. Mg deficiency up-regulated the expression of Bmp6 but did not affect the expression of inhibition of DNA binding 1, a sensitive Bmp-responsive gene. In addition, the expression of Bmp receptors such as activin receptor-like kinase 2 (Alk2), activin receptor type IIA (Actr2a), activin receptor type IIB (Actr2b) and Bmp type II receptor (Bmpr2) was lower in the liver of Mg-deficient rats than in that of control rats. The present study indicates that accumulation of hepatic Fe by Mg deficiency is a stimulant inducing Bmp6 expression but not Hepcidin expression by blunting Bmp signalling possibly resulting from down-regulation of the receptor expression. Unresponsive Hepcidin expression may have a role in Mg deficiency-induced changes related to increased liver Fe.

  14. The ileum as a determinant organ of the functional liver cell mass in rats

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    Aldo Cunha Medeiros

    2013-03-01

    Full Text Available PURPOSE: To evaluate if the ileum resection changes the functioning liver cell mass, the hepatic metabolism and the biodistribution of radiopharmaceutical in rats. METHODS: Twelve Wistar rats weighing 285g±34g were randomly divided into the ileum resection group (n = 6 and sham group rats (n = 6. After 30 days, they were anesthetized and 0.1mL of 99m-Tc-phytate (0.66MBq was injected via femoral vein. After 30 minutes, blood samples were collected for red blood cells radioactive labeling and serum ALT, AST and gammaGT. Liver samples were used for 99m-Tc-phytate percentage of radioactivity/gram of tissue and histopathology. Student 's t test was used with significance 0.05. RESULTS: There was a higher uptake of 99m-Tc-phytate in the liver of sham rats, compared to the ileum resection group (p<0.05. GammaGT, ALT and AST were increased in ileum resection rats compared to sham (p<0.05. The he patocytes count was significantly lower in ileum resection group than in sham (p<0.05. Liver: body mass ratio was lower in experimental animals than in sham group (p<0.05. CONCLUSION: These data support that the ileum has important role in liver function and liver mass regulation, and they have potential clinical implications regarding the pathogenesis of liver injury following lower bowel resection.

  15. STUDY ON MODIFIED COLD STORAGE METHOD OF RAT LIVERS WITH SELF-MADE HYD SOLUTION

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    Objective. To investigate the cold preservation effect of rat livers by modified storage method with self-made HYD solution. Methods. The modified method was that the vascular bed of rat livers was expanded with an additional 20 to 40ml self-made HYD solution/100g liver. After removing the liver, the extra HYD solution expressed as % liver weight was entrapped via portal infusion by tying off the supra-and infra hepatic inferior vena cava. According to the amount of extra HYD solution, 40 rats were randomly divided into four groups including: control group with conventional storage method, 20% group, 30% group and 40% group. The preservation effect of modified storage method with that of conventional storage method by using isolated perfused rat liver model was compared. Results. Bile production and all the indices of hepatic microcirculation including portal perfusion pressure, en-dothelin-1 in the effluent, trypan blue distribution time and histology in modified method groups were significantly su-perior to those in control group ( P < 0.05). The liver enzymes in 30% group were markedly lower than those in con-trol group (P< 0.05). The preservation effect of rat hver in 30% group was the best among the modified methodgroups. Conclusion. The modified cold storage method is effective and may have potential for clinical apphcation for hverpreservation.

  16. Changing Interdigestive Migrating Motor Complex in Rats under Acute Liver Injury

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    Mei Liu

    2014-01-01

    Full Text Available Gastrointestinal motility disorder is a major clinical manifestation of acute liver injury, and interdigestive migrating motor complex (MMC is an important indicator. We investigated the changes and characteristics of MMC in rats with acute liver injury. Acute liver injury was created by D-galactosamine, and we recorded the interdigestive MMC using a multichannel physiological recorder and compared the indexes of interdigestive MMC. Compared with normal controls, antral MMC Phase I duration was significantly prolonged and MMC Phase III duration was significantly shortened in the rats with acute liver injury. The duodenal MMC cycle and MMC Phases I and IV duration were significantly prolonged and MMC Phase III duration was significantly shortened in the rats with acute liver injury. The jejunal MMC cycle and MMC Phases I and IV duration were significantly prolonged and MMC Phase III duration was significantly shortened in the rats with acute liver injury compared with normal controls. Compared with the normal controls, rats with acute liver injury had a significantly prolonged interdigestive MMC cycle, related mainly to longer MMC Phases I and IV, shortened MMC Phase III, and MMC Phase II characterized by increased migrating clustered contractions, which were probably major contributors to the gastrointestinal motility disorders.

  17. Mangosteen peel extract reduces formalin-induced liver cell death in rats

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    Afiana Rohmani

    2014-08-01

    Full Text Available Background Formalin is a xenobiotic that is now commonly used as a preservative in the food industry. The liver is an organ that has the highest metabolic capacity as compared to other organs. Mangosteen or Garcinia mangostana Linn (GML peel contains xanthones, which are a source of natural antioxidants. The purpose of this study was to evaluate the effect of mangosteen peel extract on formalin-induced liver cell mortality rate and p53 protein expression in Wistar rats. Methods Eighteen rats received formalin orally for 2 weeks, and were subsequently divided into 3 groups, consisting of the formalin-control group receiving a placebo and treatment groups 1 and 2, which were treated with mangosteen peel extract at doses of 200 and 400 mg/kgBW/day, respectively. The treatment was carried out for 1 week, and finally the rats were terminated. The differences in liver cell mortality rate and p53 protein expression were analyzed. Results One-way ANOVA analysis showed significant differences in liver cell mortality rate among the three groups (p=0.004. The liver cell mortality rate in the treatment group receiving 400 mg/kgBW/day extract was lower than that in the formalin-control group. There was no p53 expression in all groups. Conclusions Garcinia mangostana Linn peel extract reduced the mortality rate of liver cells in rats receiving oral formalin. Involvement of p53 expression in liver cell mortality in rats exposed to oral formalin is presumably negligible.

  18. Thresholds for the effects of 2-acetylaminofluorene in rat liver.

    Science.gov (United States)

    Williams, Gary M; Iatropoulos, Michael J; Jeffrey, Alan M

    2004-01-01

    To explore for practical thresholds for DNA-reactive carcinogens in rat liver carcinogenicity, we have conducted a series of exposure-response studies using 2 well-studied hepatocarcinogens, 2-acetylaminofluorene (AAF) and diethylnitrosamine (DEN). Findings with AAF, including as yet unpublished experiments, are reviewed here and related to DEN observations. In these studies, we have administered exact intragastric doses during an initiation segment (IS) of 12-16 weeks followed in some experiments by phenobarbital (PB) as a liver tumor promoter for 24 weeks to enhance manifestation of initiation. The cumulative doses (CD) of AAF at the end of ISs ranged from 0.094 to 282.2 mg/kg. Our findings for AAF in the IS can be summarized as follows: (1) the earliest parameter to be affected with administration of low doses was the appearance of DNA adducts (around 4 weeks), followed at higher doses by cell proliferation; (2) formation of DNA adducts was nonlinear, with a no-observed effect level (NOEL) at a CD of 0.094 mg/kg and a plateau at higher doses (94.1 mg/kg); (3) cytotoxicity (necrosis) showed a NOEL at a CD of 28.2 mg/kg; (4) compensatory hepatocellular proliferation showed a NOEL at a CD of 28.2 mg/kg and was supralinear at a high CD (282.2 mg/kg); (5) formation of preneoplastic hepatocellular altered foci (HAF) showed a NOEL at a CD of 28.2 mg/kg, and was supralinear at a high CD (282.2 mg/kg); (6) a NOEL (CD 28.2 mg/kg) was found for tumor development and the exposure-response was supralinear. We interpret these findings to reflect practical thresholds for hepatocellular initiating effects of AAF and exaggerated responses at high-exposures doses, as also found for DEN. Thus, mechanisms of carcinogenesis can differ between low and high doses.

  19. Expression of liver-specific functions in rat hepatocytes following sublethal and lethal acetaminophen poisoning

    DEFF Research Database (Denmark)

    Tygstrup, N; Jensen, S A; Krog, B

    1996-01-01

    AIM: In order to study the short-term effect of moderate and severe reduction of liver function by acetaminophen poisoning of different severity on gene expression for liver-specific functions, rats were given 3.75 and 7.5 g per kg body weight acetaminophen intragastrically. The lower dose...

  20. Liver and extrahepatic contributions to postheparin serum lipase activity of the rat

    NARCIS (Netherlands)

    H. Jansen (Hans); W.C. Hülsmann (William)

    1974-01-01

    textabstractThe influence of the amount of heparin injected on the contributions of liver and of extrahepatic tissues to the lipase activity of postheparin serum of the rat was studied. It was found that when high doses of heparin (20 I.U./100 g bodyweight) were injected, the liver contributes for 6

  1. High affinity binding of (/sup 3/H)cocaine to rat liver microsomes

    Energy Technology Data Exchange (ETDEWEB)

    El-Maghrabi, E.A.; Calligaro, D.O.; Eldefrawi, M.E.

    1988-01-01

    )/sup 3/H)cocaine bound reversible, with high affinity and stereospecificity to rat liver microsomes. Little binding was detected in the lysosomal, mitochondrial and nuclear fractions. The binding kinetics were slow and the kinetically calculated K/sub D/ was 2 nM. Induction of mixed function oxidases by phenobarbital did not produce significant change in (/sup 3/H)cocaine binding. On the other hand, chronic administration of cocaine reduced (/sup 3/H)cocaine binding drastically. Neither treatment affected the affinity of the liver binding protein for cocaine. Microsomes from mouse and human livers had less cocaine-binding protein and lower affinity for cocaine than those from rat liver. Binding of (/sup 3/H)cocaine to rat liver microsomes was insensitive to monovalent cations and > 10 fold less sensitive to biogenic amines than the cocaine receptor in rat striatum. However, the liver protein had higher affinity for cocaine and metabolites except for norcocaine. Amine uptake inhibitors displaced (/sup 3/H)cocaine binding to liver with a different rank order of potency than their displacement of (/sup 3/H)cocaine binding to striatum. This high affinity (/sup 3/H)cocaine binding protein in liver is not likely to be monooxygenase, but may have a role in cocaine-induced hepatotoxicity

  2. The permeability of polyethylene glycol oligomers in the isolated perfused rat liver

    NARCIS (Netherlands)

    Mengelers, M.J.B.

    1995-01-01

    Processes occuring in the liver are very important for the description of the kinetic behaviour of drugs and compounds present in food. Therefore this research was focussed on dispersion and distribution processes occuring in the rat liver. Polyethylene glycols were used as test compounds because th

  3. Liver and extrahepatic contributions to postheparin serum lipase activity of the rat

    NARCIS (Netherlands)

    H. Jansen (Hans); W.C. Hülsmann (William)

    1974-01-01

    textabstractThe influence of the amount of heparin injected on the contributions of liver and of extrahepatic tissues to the lipase activity of postheparin serum of the rat was studied. It was found that when high doses of heparin (20 I.U./100 g bodyweight) were injected, the liver contributes for

  4. Pre-and postconditioning effects of metformin in rat donor livers

    NARCIS (Netherlands)

    Westerkamp, A.C.; De Jong, I.; Nijsten, M.W.; Leuvenink, H.G.D.; Touw, D.J.; Lisman, T.; Moshage, H.; Porte, R.J.

    2016-01-01

    Background: Pre- or reconditioning of donor livers can improve organ quality prior to transplantation. The aim of this study was to investigate whether metformin as pre- or reconditioning agent is able to reduce preservation injury in rat donor livers and improve hepatobiliary function during ex sit

  5. Pre-and postconditioning effects of metformin in rat donor livers

    NARCIS (Netherlands)

    Westerkamp, A.C.; De Jong, I.; Nijsten, M.W.; Leuvenink, H.G.D.; Touw, D.J.; Lisman, T.; Moshage, H.; Porte, R.J.

    2016-01-01

    Background: Pre- or reconditioning of donor livers can improve organ quality prior to transplantation. The aim of this study was to investigate whether metformin as pre- or reconditioning agent is able to reduce preservation injury in rat donor livers and improve hepatobiliary function during ex

  6. Exposure of precision-cut rat liver slices to ethanol accelerates fibrogenesis

    NARCIS (Netherlands)

    Schaffert, Courtney S.; Duryee, Michael J.; Bennett, Robert G.; DeVeney, Amy L.; Tuma, Dean J.; Olinga, Peter; Easterling, Karen C.; Thiele, Geoffrey M.; Klassen, Lynell W.

    Schaffert CS, Duryee MJ, Bennett RG, DeVeney AL, Tuma DJ, Olinga P, Easterling KC, Thiele GM, Klassen LW. Exposure of precision-cut rat liver slices to ethanol accelerates fibrogenesis. Am J Physiol Gastrointest Liver Physiol 299: G661-G668, 2010. First published July 1, 2010; doi:

  7. Hepatoprotective Effects of Vitamin E Against Malathion-Induced Mitochondrial Dysfunction in Rat Liver

    Directory of Open Access Journals (Sweden)

    Ranjbar

    2014-09-01

    Full Text Available Background Malathion is an insecticide of the grouping of organophosphate pesticides (OPs, which shows strong insecticidal effects. In addition, vitamin E reacting to cell membrane site may prevent OP-induced oxidative injury. Objectives The aim of this study was to examine the protective function of vitamin E on toxicity of malathion, by measuring the activities of liver and liver mitochondrial superoxide dismutase (SOD, catalase (CAT,lipid peroxidation (LPO,and glutathione peroxidase (GPx in rats. Materials and Methods The mitochondrial viability was determined in liver. ‎Effective doses of malathion(200 mg/kg/day and vitamin E (alpha-tocopherylacetate [AT]; 15 mg/kg/day were administered alone or in combination for 14 days. At the end of the experiment, the liver tissue and liver mitochondria of the animals were harvested and examined. Results In liver tissue, the activity of LPO and CAT was higher in the malathion group in comparison to controls. AT reduced malathion-induced LPO, SOD, CAT, and GPx in rat liver. Coadministration of AT with malathion improved LPO, SOD, and CAT levels in liver as well as CAT and GPx in liver mitochondria. Malathion-induced mitochondria toxicity was recovered by AT. Conclusions In conclusion, AT measurement can be beneficial for the safety or recovery of malathion-induced toxic injury in liver tissue and liver mitochondria.

  8. Phenotypic changes of human cells in human-rat liver during partial hepatectomy-induced regeneration

    Institute of Scientific and Technical Information of China (English)

    Yan Sun; Dong Xiao; Hong-An Li; Jin-Fang Jiang; Qing Li; Ruo-Shuang Zhang; Xi-Gu Chen

    2009-01-01

    AIM: To examine the human hepatic parenchymal and stromal components in rat liver and the phenotypic changes of human cells in liver of human-rat chimera (HRC) generated by in utero transplantation of human cells during partial hepatectomy (PHx)-induced liver regeneration. METHODS: Human hepatic parenchymal and stromal components and phenotypic changes of human cells during liver regeneration were examined by flow cytometry, in situ hybridization and immunohistochemistry. RESULTS: ISH analysis demonstrated human Alupositive cells in hepatic parenchyma and stroma of recipient liver. Functional human hepatocytes generated in this model potentially constituted human hepatic functional units with the presence of donor-derived human endothelial and biliary duct cells in host liver. Alpha fetoprotein (AFP)+, CD34+ and CD45+ cells were observed in the chimeric liver on day 10 after PHxinduced liver regeneration and then disappeared in PHx group, but not in non-PHx group, suggesting that dynamic phenotypic changes of human cells expressing AFP, CD34 and CD45 cells may occur during the chimeric liver regeneration. Additionally, immunostaining for human proliferating cell nuclear antigen (PCNA) showed that the number of PCNA-positive cells in the chimeric liver of PHx group was markedly increased, as compared to that of control group, indicating that donor-derived human cells are actively proliferated during PHx-induced regeneration of HRC liver.

  9. Actions of juglone on energy metabolism in the rat liver

    Energy Technology Data Exchange (ETDEWEB)

    Saling, Simoni Cristina; Comar, Jurandir Fernando; Mito, Marcio Shigueaki; Peralta, Rosane Marina; Bracht, Adelar, E-mail: adebracht@uol.com.br

    2011-12-15

    Juglone is a phenolic compound used in popular medicine as a phytotherapic to treat inflammatory and infectious diseases. However, it also acts as an uncoupler of oxidative phosphorylation in isolated liver mitochondria and, thus, may interfere with the hepatic energy metabolism. The purpose of this work was to evaluate the effect of juglone on several metabolic parameters in the isolated perfused rat liver. Juglone, in the concentration range of 5 to 50 {mu}M, stimulated glycogenolysis, glycolysis and oxygen uptake. Gluconeogenesis from both lactate and alanine was inhibited with half-maximal effects at the concentrations of 14.9 and 15.7 {mu}M, respectively. The overall alanine transformation was increased by juglone, as indicated by the stimulated release of ammonia, urea, L-glutamate, lactate and pyruvate. A great increase (9-fold) in the tissue content of {alpha}-ketoglutarate was found, without a similar change in the L-glutamate content. The tissue contents of ATP were decreased, but those of ADP and AMP were increased. Experiments with isolated mitochondria fully confirmed previous notions about the uncoupling action of juglone. It can be concluded that juglone is active on metabolism at relatively low concentrations. In this particular it resembles more closely the classical uncoupler 2,4-dinitrophenol. Ingestion of high doses of juglone, thus, presents the same risks as the ingestion of 2,4-dinitrophenol which comprise excessive compromising of ATP production, hyperthermia and even death. Low doses, i.e., moderate consumption of natural products containing juglone, however, could be beneficial to health if one considers recent reports about the consequences of chronic mild uncoupling. -- Highlights: Black-Right-Pointing-Pointer We investigated how juglone acts on liver metabolism. Black-Right-Pointing-Pointer The actions on hepatic gluconeogenesis, glycolysis and ureogenesis. Black-Right-Pointing-Pointer Juglone stimulates glycolysis and ureagenesis and

  10. Expression and significance of SOCS3 in liver tissue of rats with severe acute pancreatitis complicated by liver injury

    Directory of Open Access Journals (Sweden)

    Bin WANG

    2012-11-01

    Full Text Available Objective  To investigate the expression and mechanism of action of suppressor of cytokine signaling 3 (SOCS3 in liver tissue of rats with experimental severe acute pancreatitis (SAP concurring with liver injury. Methods  The rat model of SAP was reproduced by retrograde injection of 4% sodium taurocholate into the biliopancreatic duct. Thirty-two male SD rats were randomly assigned into 4 groups (8 each: normal control group (NC, SAP 6h, 12h, and 18h groups. The levels of serum amylase (AMY, alanine aminotransferase (ALT and aspartate aminotransferase (AST were measured dynamically. The concentrations of IL -6 and IL -18 were determined by ELISA. The localization and expression of SOCS3 protein in liver were determined by immunohistochemical staining and Western blotting. Results  Compared with NC group, the serum levels of AMY, ALT and AST increased significantly in SAP groups (P < 0.05, and there was significant difference among SAP groups. The serum concentrations of IL-6 and IL-18 increased significantly in the SAP groups than in NC group (P < 0.05, and there was significant difference among SAP groups. Compared with NC group, the concentration of SOCS3 protein increased significantly in SAP groups, and increased gradually along with the increased duration of pancreatitis (P < 0.05. A minor expression of SOCS3 protein was found in NC group. The change in SOCS3 protein concentration was consistent with the severity of liver injury as well as the serum concentrations of IL-6 and IL-18. Conclusions  The inflammatory action induced by SAP concurring with liver injury may induce the expression of SOCS3 in liver tissue, and it may increase in intensity along with the severity of liver injury and inflammatory reaction. The mechanism may be attributed to a negative feedback regulation of the inflammatory action mediated by JAK/STAT pathway.

  11. Modulation of liver enzymes by an Iranian preparation of Echinacea purpurea

    Directory of Open Access Journals (Sweden)

    A. Manayi

    2015-10-01

    Full Text Available Hepatitis B, a common infectious disease of liver, is transmitted by blood and body fluids like semen and vaginal fluid that carry hepatitis B virus (HBV.  In chronic infection, medical care is required to decrease possibility of cirrhosis and liver cancer. In the present report, the hepatoprotective effect of an Echinacea purpurea preparation (Echiherb® has been described in a patient who suffered from HBV infection. The levels of both enzymes of aspartate aminotransferase (AST and alanine aminotransferase (ALT decreased to their normal level after 6 weeks of treatment. Therefore, this report may provide a new perspective for protection of liver in patients with HBV infection along with other diseases which damage liver cells using E. purpurea preparations.

  12. Proteomic profiling in incubation medium of mouse, rat and human precision-cut liver slices for biomarker detection regarding acute drug-induced liver injury

    NARCIS (Netherlands)

    van Swelm, Rachel P. L.; Hadi, Mackenzie; Laarakkers, Coby M. M.; Masereeuw, Rosalinde; Groothuis, Geny M. M.; Russel, Frans G. M.

    2014-01-01

    Drug-induced liver injury is one of the leading causes of drug withdrawal from the market. In this study, we investigated the applicability of protein profiling of the incubation medium of human, mouse and rat precision-cut liver slices (PCLS) exposed to liver injury-inducing drugs for biomarker ide

  13. Early detection of liver fibrosis in rats using 3-D ultrasound Nakagami imaging: a feasibility evaluation.

    Science.gov (United States)

    Ho, Ming-Chih; Tsui, Po-Hsiang; Lee, Yu-Hsin; Chen, Yung-Sheng; Chen, Chiung-Nien; Lin, Jen-Jen; Chang, Chien-Cheng

    2014-09-01

    We investigated the feasibility of using 3-D ultrasound Nakagami imaging to detect the early stages of liver fibrosis in rats. Fibrosis was induced in livers of rats (n = 60) by intraperitoneal injection of 0.5% dimethylnitrosamine (DMN). Group 1 was the control group, and rats in groups 2-6 received DMN injections for 1-5 weeks, respectively. Each rat was sacrificed to perform 3-D ultrasound scanning of the liver in vitro using a single-element transducer of 6.5 MHz. The 3-D raw data acquired at a sampling rate of 50 MHz were used to construct 3-D Nakagami images. The liver specimen was further used for histologic analysis with hematoxylin and eosin and Masson staining to score the degree of liver fibrosis. The results indicate that the Metavir scores of the hematoxylin and eosin-stained sections in Groups 1-4 were 0 (defined as early liver fibrosis in this study), and those in groups 5 and 6 ranged from 1 to 2 and 2 to 3, respectively. To quantify the degree of early liver fibrosis, the histologic sections with Masson stain were analyzed to calculate the number of fiber-related blue pixels. The number of blue pixels increased from (2.36 ± 0.79) × 10(4) (group 1) to (7.68 ± 2.62) × 10(4) (group 4) after DMN injections for 3 weeks, indicating that early stages of liver fibrosis were successfully induced in rats. The Nakagami parameter increased from 0.36 ± 0.02 (group 1) to 0.55 ± 0.03 (group 4), with increasing numbers of blue pixels in the Masson-stained sections (p-value Nakagami imaging has potential in the early detection of liver fibrosis in rats and may serve as an image-based pathologic model to visually track fibrosis formation and growth.

  14. IMPACTS OF HIGH DIETARY FAT ON SERUM CHOLESTEROL AND DEVELOPMENT OF FATTY LIVER IN RATS

    Directory of Open Access Journals (Sweden)

    Rajesh Pandey et al

    2012-09-01

    Full Text Available The present study was designed to evaluate the impacts of high dietary fat on serum Total cholesterol and fatty liver syndrome in rats. Rats are fed on diets containing cholesterol; they develop fatty livers which are characterized by the presence in the liver of excessive amounts of cholesteryl esters, and glyceride. Increasement of glyceride content depend on a number of factors, such as the dietary contents of choline, While the nature of the "cholesterol" fatty liver and the effects on its composition of a number of dietary and other factors. In the present paper, we investigated the quantitative changes which occur in the "cholesterol" fatty liver, as a result of variations in the fat content of the diet, with particular reference to the deposition of cholesterol and of glyceride on diets of constant cholesterol content. Investigation was conducted on 90 day old Wister rats. It was observed that the serum TC values in rats of groups B and C were higher than control group. Furthermore, the serum TC and TG value was higher in rats of group C than group B. Grossly, the livers of rats of groups B and C were enlarged, pale in colour, soft in consistency and were having petechial haemorrhages with fat and fibrin deposits. Histopathologically, livers of groups B and C showed fatty infiltration, haemorrhages and mass of eosinophilic materials. The vacuoles coalesced to create clear space that displaced the nucleus to the periphery of the cell. The results suggested that addition of dietary fat from animal and vegetable sources in the diet of rats not only resulted in increase in serum TC and TG but also in marked macroscopic and microscopic changes in vital organ liver.

  15. Triglyceride kinetics, tissue lipoprotein lipase, and liver lipogenesis in septic rats

    Energy Technology Data Exchange (ETDEWEB)

    Lanza-Jacoby, S.; Tabares, A. (Jefferson Medical College, Philadelphia, PA (USA))

    1990-04-01

    The mechanism for the development of hypertriglyceridemia during gram-negative sepsis was studied by examining liver production and clearance of very-low-density lipoprotein (VLDL) triglyceride (TG). To assess liver output and peripheral clearance the kinetics of VLDL-TG were determined by a constant iv infusion of (2-3H)glycerol-labeled VLDL. Clearance of VLDL-TG was also evaluated by measuring activities of lipoprotein lipase (LPL) in heart, soleus muscle, and adipose tissue from fasted control, fasted E. coli-treated, fed control, and fed E. coli-treated rats. Lewis inbred rats, 275-300 g, were made septic with 8 x 10(7) live E. coli colonies per 100 g body wt. Twenty-four hours after E. coli injection, serum TG, free fatty acids (FFA), and cholesterol of fasted E. coli-treated rats were elevated by 170, 76, and 16%, respectively. The elevation of serum TG may be attributed to the 67% decrease in clearance rate of VLDL-TG in fasted E. coli-treated rats compared with their fasted controls. The suppressed activities of LPL in adipose tissue, skeletal muscle, and heart were consistent with reduced clearance of TG. Secretion of VLDL-TG declined by 31% in livers of fasted E. coli-treated rats, which was accompanied by a twofold increase in the composition of liver TG. Rates of in vivo TG synthesis in livers of the fasted E. coli-treated rats were twofold higher than in those of fasted control rats. Decreased rate of TG appearance along with the increase in liver synthesis of TG contributed to the elevation of liver lipids in the fasted E. coli-treated rats.

  16. Protective effects of vitamin D3 against d-galactosamine-induced liver injury in rats.

    Science.gov (United States)

    Colakoglu, Neriman; Kuloglu, Tuncay; Ozan, Enver; Kocaman, Nevin; Dabak, Durrin Ozlem; Parlak, Gozde

    2016-08-01

    In this study, we examined liver damage induced by d-galactosamine (d-GaIN) and the protective effects of vitamin D3 in relation to d-GaIN toxicity. Twenty Wistar albino rats were used in this study. The rats were divided into four groups. Group I rats were used as the control group. Group II rats were given a single intraperitoneal injection of d-GaIN. Group III rats were given a single intraperitoneal injection of d-GaIN, intramuscular vitamin D3 for five days. Group IV rats were given intramuscular vitamin D3 for five days. All of rats were euthanized by cervical decapitation on the fifth day of experiment. Upon completion of the experiment, a midsaggital incision was performed, and the livers of all rats were removed and fixed. The livers were processed to perform TUNEL technique and histochemical staining. During the microscope examination, we observed inflamatory cell infiltration, sinusoidal dilatation, and apoptotic bodies due to d-GaIN exposure. In addition, glycogen content of the group II hepatocytes was significantly decreased. Vitamin D3 treatment provided better structural apperance of the livers in group III. TUNEL positive cells were extremly pervasive in the group II livers. The study found group III TUNEL positive cells at a reduced rate in relation to group II due to vitamin D3 treatment. This findings indicate that d-GaIN causes inflamation in the liver. This inflamation triggers the apoptotic process gradually. Vitamin D3 has potency to decrease the severity of d-GaIN-caused structural liver damage. Copyright © 2016 Elsevier Ltd. All rights reserved.

  17. Content of bioelements in the lungs and liver in rats with alimentary obesity.

    Science.gov (United States)

    Trunova, V A; Sidorina, A V; Zvereva, V V; Churin, B V; Starkova, E V; Sorokoletov, D S

    2016-01-01

    The synchrotron radiation X-ray fluorescence technique (SRXRF) was applied to the determination of K, Ca, Mn, Fe, Cu, Zn, Se, Br, Rb, and Sr concentrations in the liver and lungs in Wistar rats. The animals in the experiment included (1) healthy rats, (2) rats with alimentary obesity (AO), and (3) rats with alimentary obesity that were being given zinc sulphate with water for a long time (АО+Zn). Each group was divided into two subgroups. The experiment with the first subgroup was terminated with the animals in the state of physiological hunger and subsequent retrieval of liver and lung tissue, while the animals of the second subgroup were sacrificed two hours after ingestion of lard. The rats in physiological hunger manifested intergroup differences in the content of the bioelements (BEs) neither in the liver nor in the lungs. The rats with AO, as compared with the healthy animals, demonstrated in physiological hunger redistribution of inter-element correlations (IECs), which is an indirect reflection of sustained metabolic disorder. Additional zinc in the rats' ration did not affect their body weight and the concentration of the BEs (including zinc) in the liver and the lungs. However, the IECs in the tissues of these animals in physiological hunger also changed. This redistribution differed from that in the rats with AO. The IECs soon after ingestion of lard also changed, which also reflects sustained changes in the metabolism in the animals.

  18. METABOLOMIC EVALUATION OF RAT LIVER AND TESTIS TO CHARACTERIZE THE TOXICITY OF TRIAZOLE FUNGICIDES

    Science.gov (United States)

    The effects of two triazole fungicides, myclobutanil and triadimefon, on endogenous rat metabolite profiles in blood serum, liver, and testis was assessed using proton nuclear magnetic resonance (1H-NMR) spectroscopy. Adult male Sprague-Dawley rats were dosed daily by gavage for...

  19. The Effects of Pollen on Serum Parameters, and Liver and Kidney Tissues on Rats

    Directory of Open Access Journals (Sweden)

    Güldeniz Selmanoğlu

    2007-01-01

    Full Text Available The objective of this study was to investigate any positive effects or possible side effects of the use of pollen. Mature male rats were fed pollen of three different plant sources (Trifolium spp., Raphanus spp. and Cistus spp. at the rate of 60 mg/animal/day over a periodof 30 days. After treatment, biochemical parameters and serum enzyme activities were analysed and weights of liver and kidney measured. Liver and kidney tissues of rats were examined by light microscope.Serum cholesterol and HDL levels decreased in rats fed on pollen of Trifolium spp. and Cistus spp. Serum glucose levels increased in rats given pollen of Trifolium spp. and Raphanus spp. There was no change in serum enzyme levels in rats of any pollen group.While absolute liver weights of rats fed on pollen of Trifolium spp. and Cistus spp. increased, no change at all in absolute kidney weight and relative weight (organ weight/body weight of liver and kidney of rats was found in any pollen group. Histopathological changes in theliver and kidney of rats given pollen were not observed. Although serum cholesterol and HDL levels decreased, we cannot suggest that pollen caused either adverse or beneficial effects because of the short tretment period of 30 days.

  20. Endotoxin-induced liver damage in rats is minimized by β2- adrenoceptor stimulation

    NARCIS (Netherlands)

    Izeboud, C.A.; Hoebe, K.H.N.; Grootendorst, A.F.; Nijmeijer, S.M.; Miert, A.S. van; Witkamp, R.F.; Rodenburg, R.J.T.

    2004-01-01

    Objective and Design: To investigate the effects of β2- adrenoceptor (β2-AR) stimulation on endotoxin-induced liver damage and systemic cytokine levels in rats. Subjects: Standard male Wistar rats. Treatment: A disease-model of lipolysaccharide (LPS)-induced acute systemic inflammation was used. The

  1. Ribonucleases from rat and bovine liver : purification, specificity and structural characterization

    NARCIS (Netherlands)

    Zhao, W; Kote-Jarai, Z; van Santen, Y; Hofsteenge, J; Beintema, JJ

    1998-01-01

    The presence of four members of the pyrimidine-specific ribonuclease superfamily was demonstrated in rat liver. Three of them (RL1, RL2 and RL3) were purified and showed ribonuclease activity at pH 7.5 with yeast RNA as substrate. RL1 is identical to rat pancreatic ribonuclease (ribonuclease 1). N-t

  2. Four new koumine metabolites in rat liver microsomes.

    Science.gov (United States)

    Zhang, Lin; Du, Lan; Lv, Wen-Wen; Zhao, Qing-Chun; Hua, Wei; An, Ye; Guo, Tao; Wu, Li-Jun

    2013-01-01

    Four new metabolites M-1 [1,2,18,19-tetradehydro-4-demethyl-3,17-epoxy-7,20(2H,19H)-cyclovobasan], M-2 [1,2,4,21,18,19-hexadehydro-4-demethyl-3,17-epoxy-7,20(2H,19H)-cyclovobasan], M-3 [1,2,18,19-tetradehydro-4-demethyl-4-formaldehyde-3,17-epoxy-7,20(2H,19H)-cyclovobasan], and M-4 [1,2,4,21,18,19-hexadehydro-4-demethyl-4-oxy-3,17-epoxy-7,20(2H,19H)-cyclovobasan] were isolated from the chloroform extract of koumine incubated with phenobarbital-treated rat liver microsomes. The structures of M-1, M-2, M-3, and M-4 were elucidated by spectroscopic methods including ESI-TOF-MS, 1D, and 2D NMR experiments. The metabolic pathway of koumine was proposed. The cytotoxic activities between koumine and its metabolites were also compared in the A549 cell line.

  3. Stereoselective degradation of tebuconazole in rat liver microsomes.

    Science.gov (United States)

    Shen, Zhigang; Zhu, Wentao; Liu, Donghui; Xu, Xinyuan; Zhang, Ping; Zhou, Zhiqiang

    2012-01-01

    The aim of this study was to assess the stereoselectivity of two tebuconazole [(RS)-1-p-chlorophenyl-4,4-dimethyl-3-(1H-1,2,4-triazol-1-ylmethyl)pentan-3-ol] enantiomers in in vitro system (rat liver microsomes). The analytes were extracted with acetic ether and concentrations were determined by high performance liquid chromatography (HPLC) with a cellulose tris(3,5-dimethylphenylcarbamate)-based chiral stationary phase. The degradation of rac-tebuconazole (15 μM) followed first-order kinetics, and the degradation of the S-tebuconazole (t(1/2) = 22.31 min) was faster than that of the R-tebuconazole (t(1/2) = 48.76 min), but no significant difference between the enantiomers was found in the respective incubation (7.5 μM for each). Kinetic assays showed that the K(m) was different between the two enantiomers (K(mR) = 14.83 ± 2.19, K(mS) = 12.23 ± 2.72). The interaction results revealed that there was competitive inhibition between S- and R-form, and there was a significant difference between the IC(50) of R- to S-tebuconazole and S- to R-tebuconazole (IC(50R/S)/IC(50S/R) = 4.98).

  4. A Biochemical and Morphological Study of Rat Liver Microsomes

    Science.gov (United States)

    Moulé, Y.; Rouiller, C.; Chauveau, J.

    1960-01-01

    Microsomes isolated by differential centrifugation from a rat liver homogenate in 0.88 M sucrose solution have been studied from the biochemical and morphological point of view. 1. Under these experimental conditions, the "total microsome" fraction was obtained by centrifuging the cytoplasmic extract free of nuclei and mitochondria, for 3 hours at 145,000 g. Morphologically, the total microsomes consist mainly of "rough-surfaced membranes" and "smooth" ones. 2. The total microsomes have been divided into 2 subfractions so that the 1st microsomal fraction contains the "rough" vesicles (2 hours centrifugation at 40,000 g) while the 2nd microsomal fraction consists essentially of smooth vesicles, free particles, and ferritin (centrifugation of the supernatant at 145,000 g for 3 hours). 3. By the action of 0.4 per cent sodium deoxycholate in 0.88 M sucrose, it was possible to obtain a pellet for each of the 2 fractions which consisted of dense particles, rich in RNA, poor in lipids, and which represented about 50 to 60 percent of the RNA and 10 to 15 per cent of the proteins. The results have been discussed taking into consideration the hypothesis of the presence of RNA in the membranes of microsomal vesicles. PMID:14424705

  5. Mono(ADP-ribosylation) in rat liver mitochondria.

    Science.gov (United States)

    Frei, B; Richter, C

    1988-01-26

    This paper investigates protein mono(ADP-ribosylation) in rat liver mitochondria. In isolated inner mitochondrial membranes, in the presence of both ADP-ribose and NAD+, a protein is mono-(ADP-ribosylated) with high specificity. The reaction apparently consists of enzymatic NAD+ glycohydrolysis and subsequent binding of free ADP-ribose to the acceptor protein. In terms of chemical stability, the resulting bond is unique among the ADP-ribose linkages thus far characterized. Formation of a Schiff base adduct between free ADP-ribose and the acceptor protein is excluded. In intact mitochondria at least three classes of proteins are ADP-ribosylated in vivo. One ADP-ribose-protein linkage is of the carboxylate ester type as indicated by its lability in neutral buffer. Another class of ADP-ribosylated proteins requires hydroxylamine for release of ADP-ribose. The third class is stable in hydroxylamine but labile to alkali, similar to the ADP-ribose-cysteine linkage in transducin formed by pertussis toxin.

  6. The expression of HIF-1 α in liver tissues in the rat model of paraquat poisoning

    Institute of Scientific and Technical Information of China (English)

    熊莺

    2014-01-01

    Objective To observe the levels of HIF-αand TGF-βin the liver tissue,change of serum transaminase in different phases after paraquat(PQ)toxicity and liver histopathology change in PQ-induced liver toxicity of rat models in order to analyze the relationship between HIF-αand hepatic toxicity induced by PQ.Methods A total of 48 healthy SD rats were randomly(random number)assigned into 2 groups:PQ poisoning group(n=42,

  7. Injurious effect on rat liver mitochondria by lymphocytes from patients with primary biliary cirrhosis.

    Science.gov (United States)

    Bootello, A; Fernandez-Cruz, E; Escartin, P; Blanco, M F; Gosalvez, M; Segovia De Arana, J M

    1976-01-01

    Lymphocytes from primary biliary cirrhosis (PBC) patients were shown to have an injurious effect on rat liver mitochondria, as was demonstrated by the inhibition of mitochondrial respiratory control by these cells. The incubation of the PBC patients' lymphocytes with isolated rat liver mitochondria produced a significant inhibition of mitochondrial respiration in the presence of ADP. However, no significant effect on respiration was seen with control lymphocytes of normal persons or with lymphocytes from patients with alcoholic cirrhosis and miscellaneous liver diseases. The results suggest that this injurious effect of PBC lymphocytes on mitochondria might be a consequence of sensitization in vivo of the PBC patients' lymphocytes by the mitochondrial antigens. PMID:1277585

  8. The Effect of Zofenopril on Pancreas, Kidney and Liver of Diabetic Rats

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    Ayşe ÇARLIOĞLU

    2014-05-01

    Full Text Available OBJECTIVE: Oxidative stress is responsible for some important complications of diabetes mellitus. Zofenopril, which has an antioxidant effect, may decrease the oxidative stress of the diabetic microenvironment. The aim of our study was to evaluate the effect of zofenopril in the liver, pancreas and kidney of alloxan-induced diabetic rats. MATERIAL and METHODS: Rats were divided into five groups: control group (n=6, rats treated with zonenopril (50 mg/kg/day, orally four weeks; n=6, rats exposed to alloxane (120 mg/kg single dose intraperitoneal injection, n=6, rats administered alloxan+zofenopril (n=6 and rats administered insulin plus alloxan. RESULTS: After one month, we observed histological improvement in the kidneys but not in the pancreas and liver. CONCLUSION: In conclusion, zofenopril may be effective on the renal complications of diabetes mellitus.

  9. A novel form of the human manganese superoxide dismutase protects rat and human livers undergoing ischaemia and reperfusion injury

    National Research Council Canada - National Science Library

    Hide, Diana; Ortega-Ribera, Martí; Fernández-Iglesias, Anabel; Fondevila, Constantino; Salvadó, M Josepa; Arola, Lluís; García-Pagán, Juan Carlos; Mancini, Aldo; Bosch, Jaime; Gracia-Sancho, Jordi

    2014-01-01

    ...), liver grafts from healthy and steatotic rats, and human liver samples, we aimed to characterize the effects of a new recombinant form of human manganese superoxide dismutase (rMnSOD) on hepatic CS+WR injury. After CS...

  10. Protective Properties of Flavonoid Extract of Coagulated Tofu (Curdled Soy Milk Against Acetaminophen-Induced Liver Injury in Rats

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    Ndatsu Yakubu

    2016-01-01

    Full Text Available The total flavonoid contents of the various coagulated tofu and the hepatoprotective potential of all tofu flavonoid extracts were investigated. Tofu was prepared from locally sourced coagulants (steep water, alum, lemon, and lemon peel ash extract. Total flavonoid contents of all coagulated tofu were investigated as established in vitro flavonoid assay. The hepatoprotective activities of tofu flavonoid extracts against acetaminophen-induced hepatic cell toxicity in rats was also investigated in this study. The activity was analyzed by assessing the levels of serum alanine aminotransferase (ALT, aspartate aminotransferase (AST, alkaline phosphatase (ALP and lactate dehydrogenase (LDH. The concentrations of the serum sugar, total protein, albumin, and cholesterol as well as prothrombin time (PT of experimental rats with histopathological analysis were also conducted. The range of the total flavonoid contents of tofu was 4.3-6.4 mg/g. Tofu flavonoid extracts significantly reduced the activities of serum AST, ALT, ALP, and LDH; total cholesterol, and sugar levels, but total protein and albumin concentrations increased compared to acetaminophen-intoxicated rats. Also, the prothrombin time prolongation of serum in acetaminophen intoxicated rats was reduced. Histology of the liver tissue demonstrated that tofu flavonoid extracts inhibited the acetaminophen-induced hepatic cell necrosis, decreased inflammatory cell infiltration and accelerated hepatocellular regeneration. Therefore, all tofus exhibited high total flavonoid contents, and the tofu supplement in human diets is highly recommended as it can be used as a functional food to prevent liver injuries.

  11. Perinatal hypothyroidism modulates antioxidant defence status in the developing rat liver and heart.

    Science.gov (United States)

    Zhang, Hongmei; Dong, Yan; Su, Qing

    2017-02-01

    In the present study, we investigated oxidative stress parameters and antioxidant defence status in perinatal hypothyroid rat liver and heart. We found that the proteincarbonyl content did not differ significantly between the three groups both in the pup liver and in the heart. The OH˙ level was significantly decreased in the hypothyroid heart but not in the liver compared with controls. A slight but not significant decrease in SOD activity was observed in both perinatal hypothyroid liver and heart. A significantly increased activity of CAT was observed in the liver but not in the heart of hypothyroid pups. The GPx activity was considerably increased compared with controls in the perinatal hypothyroid heart and was unaltered in the liver of hypothyroid pups. We also found that vitamin E levels in the liver decreased significantly in hypothyroidism and were unaltered in the heart of perinatal hypothyroid rats. The GSH content was elevated significantly in both hypothyroid liver and heart. The total antioxidant capacity was higher in the liver of the hypothyroid group but not in the hypothyroid heart. Thyroxine replacement could not repair the above changes to normal. In conclusion, perinatal hypothyroidism modulates the oxidative stress status of the perinatal liver and heart.

  12. [Effect of titanium dioxide nanoparticles on protein expression profiles in rat liver microsomes].

    Science.gov (United States)

    Tananova, O N; Arianova, E A; Gmoshinskiĭ, I V; Aksenov, I V; Zgoda, V G; Khotimchenko, S A

    2012-01-01

    There was studied an influence of intragastric administration of titanium dioxide (anatase form) nanoparticles (NP) on protein expression profiles in rat's liver microsomes by methods of proteomics. Animals received water suspension of NP in doses from 0,1 to 10 mg per kg body weight intragastrically daily during 28 days. Microsomes were isolated from liver by means of preparative ultracentrifugation. Proteins composition was studied by 2D-electrophoresis in acrylamide gel. Protein spots were identified by MALDI-TOF analysis. The results demonstrated appearance of 53 new protein spots and disappearance of 19 spots in animals subjected to NP irrespective of their dose. In addition 25 new spots appeared and 3 disappeared in higher doses of NP when compared to low dose group and control animals. Mass-spectrum analysis showed presence of few polypeptides registered in international database among proteins expressed under influence of NP. One of this dominant expressed proteins corresponded to enzyme glutathione transpherase Mu 2 isoform (M=41,55 kD, pI=8,0). The conclusion was made of well advances of proteomic analysis in artificial NP influences on biosynthetic processes estimation.

  13. Identification of paraoxonase 3 in rat liver microsomes: purification and biochemical properties.

    Science.gov (United States)

    Rodrigo, Lourdes; Gil, Fernando; Hernandez, Antonio F; Lopez, Olga; Pla, Antonio

    2003-01-01

    Three paraoxonase genes (PON1, PON2 and PON3) have been described so far in mammals. Although considerable information is available regarding PON1, little is known about PON2 and PON3. PON3 has been isolated recently from rabbit serum [Draganov, Stetson, Watson, Billecke and La Du (2000) J. Biol. Chem. 275, 33435-33442] and liver [Ozols (1999) Biochem. J. 338, 265-275]. In the present study, we have identified the presence of PON3 in rat liver microsomes and a method for the purification to homogeneity is presented. PON3 has been purified 177-fold to apparent homogeneity with a final specific activity of 461 units/mg using a method consisting of seven steps: solubilization of the microsomal fraction, hydroxyapatite adsorption, chromatography on DEAE-Sepharose CL-6B, non-specific affinity chromatography on Cibacron Blue 3GA, two DEAE-cellulose steps and a final affinity chromatography on concanavalin A-Sepharose. SDS/PAGE of the final preparation indicated a single protein-staining band with an apparent molecular mass of 43 kDa. The isolated protein was identified by nanoelectrospray MS. Internal amino acid sequences of several peptides were determined and compared with those of human, rabbit and mouse PON3, showing a high similarity. Some biochemical properties of PON3 were also studied, including optimum pH, K(m) and heat and pH stability. PMID:12946270

  14. Synthesis of albumin via a precursor protein in cell suspensions from rat liver.

    Science.gov (United States)

    Edwards, K; Schreiber, G; Dryburgh, H; Urban, J; Inglis, A S

    1976-03-16

    The mechanism of the biosynthesis of albumin was studied in cell suspensions from rat liver. The cells were prepared by continuous perfusion of the liver in situ with 0.05% collagenase and 0.10% hyaluronidase and incubated under conditions optimized for the incorporation of amino acids into protein. Seven minutes after starting the incubation L-[1-14C]leucine was added, followed after 25 min by a 15 or 30-min chase with an 830-fold excess of non-radioactive L-leucine. Total protein, an albumin-like protein, and albumin were isolated from samples withdrawn immediately of total protein was found to remain constant after addition of the non-radioactive L-leucine, whereas that of the albumin-like protein decreased and that of albumin increased with incubation time. The increase in albumin radioactivity accounted for the decrease in radioactivity of the albumin-like protein, suggesting that the latter is a precursor of albumin. The precursor protein differed from albumin by an oligopeptide extension at the N-terminal end.

  15. Pistacia Terebinthus Coffee Protects against Thioacetamide-Induced Liver Injury in Rats

    Directory of Open Access Journals (Sweden)

    Ibrahim Halil Bahcecioglu

    2015-08-01

    Full Text Available Aim/background: Pistacia terebinthus is used as a coffee substitute in the East and Southern Anatolia regions of Turkey. It contains unsaturated fatty acids, tocopherols, polyphenols and carotenoids. P. terebinthus has anti-inflammatory and potential antioxidant activity. In this study we evaluated the protective effects of P. terebinthus coffee (PTC on thioacetamide (TAA-induced liver injury in rats. Materials and methods: Twenty-eight male Sprague-Dawley rats were equally randomized into four groups. Chronic liver injury was induced with TAA (100 mg/kg i.p. three times weekly. The first group of rats served as control and received only tap water (G1, and the remaining groups of rats received PTC, p.o (G2; TAA (G3; TAA plus PTC, p.o (G4, respectively. Results: After 8 weeks, PTC intake significantly reduced fibrosis/ inflammation scores (p < 0.05 in the livers of TAA-treated group. Compared to control group, PTC intake reduced transforming growth factor beta (TGF-β concentrations in the liver (p < 0.05. Compared to the TAA group, TGF-β, nuclear factor kappa B (NF-κB (p < 0.05, tumor necrosis factor alpha (TNF-α concentrations in the liver tissue were reduced by PTC intake. Discussion and conclusion: PTC intake provided beneficial effects against TAA-induced liver injury in rats. PTC probably suppresses the proinflammatory cytokines through NF-κB signaling pathway.

  16. Liver and plasma levels of descarboxyprothrombin (PIVKA II) in vitamin K deficiency in rats.

    Science.gov (United States)

    Harauchi, T; Takano, K; Matsuura, M; Yoshizaki, T

    1986-04-01

    Descarboxyprothrombin (PIVKA II) is a precursor of prothrombin without biological activity, and it increases with vitamin K deficiency. We studied the time course changes in liver and plasma levels of PIVKA II during the progress of vitamin K deficiency in rats. Good correlation was observed between liver PIVKA II and plasma PIVKA II and between liver or plasma PIVKA II and plasma prothrombin in experiments in which rats were fed a vitamin K-deficient diet. Feeding of a vitamin K-deficient diet or fasting caused marked increases in liver and plasma PIVKA II in male rats and a weaker response in female rats. Warfarin, a vitamin K antagonist, caused an abrupt increase in liver PIVKA II, but the increase in plasma PIVKA II was delayed about 3 hr. Plasma prothrombin decreased from about 30 min later. Factor VII decreased similarly to prothrombin, and changes in the prothrombin time and activated partial thromboplastin time were slower than the changes in these substances. Sex differences were not seen in these warfarin actions. These observations indicate that liver and plasma PIVKA II are sensitive markers of vitamin K deficiency in rats, and assay of PIVKA II can be useful for analyzing the action mechanism of drugs which influence blood coagulation.

  17. Resveratrol attenuates oxidative stress and histological alterations induced by liver ischemia/reperfusion in rats

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    AIM: To investigate the effects of resveratrol on liver ischemia/reperfusion (I/R) injury in rats. METHODS: A total of 40 male Sprague-Dawley rats weighing 240-290 g were randomized into four groups often: (1) controls: data from unmanipulated animals; (2) sham group: rats subjected to the surgical procedure, except for liver I/R, and given saline; (3) I/R group: rats underwent liver ischemia for 45 min followed by reperfu-sion for 45 min; (4) I-R/Resveratrol group: rats pretreat-ed with resveratrol (10 μmol/L, iv). Liver tissues were obtained to determine antioxidant enzyme levels and for biochemical and histological evaluation. RESULTS: Plasma aminotransferase activities were higher in the I/R group than in the I-R/Resveratrol group. Malondialdehyde levels and the hepatic injury score decreased, while superoxide dismutase, catalase, and glutathione peroxidase levels increased in group 4 compared to group 3. In group 4, histopathological changes were significantly attenuated in resveratrol-treated livers.CONCLUSION: These results suggest that resveratrol has protective effects against hepatic I/R injury, and is a potential therapeutic drug for ischemia reperfusion-related liver injury.

  18. Protective effect of magnesium and selenium on cadmium toxicity in the isolated perfused rat liver system.

    Directory of Open Access Journals (Sweden)

    Ali Ghaffarian-Bahraman

    2014-12-01

    Full Text Available The isolated perfused rat liver (IPRL model has been used into toxicology study of rat liver. This model provides an opportunity at evaluation of liver function in an isolated setting. Studies showed that Cd, in a dose-dependent manner, induced toxic effects in IPRL models, and these effects were associated with aminotransferase activity and lipid peroxidation. The aim of this study was to investigate whether Mg  and/or Se could have protective effects against the Cd toxicity in the IPRL model. Male Wistar rats (9-10 weeks weighing 260-300 gr were used in this study. They were randomly divided into 8 groups of 4-6 rats per cage. In group 1, liver was perfused by Krebs-Henseleit buffer without MgSO4 (Control. Groups 2-8 were exposed to Mg, Se, Cd, Mg +Se, Cd + Mg, Cd + Se, Cd + Mg + Se respectively in Krebs-Henseleit buffer with no added MgSo4. Biochemical changes in the liver were examined within 90 minutes, and the result showed that the exposure to Cd, lowered glutathione level, while it increased malondialdehyde level and aminotransferase activities in IPRL model. Mg administration during exposure to Cd reduces the toxicity of Cd in the liver isolated while Se administration during exposure to Cd did not decrease Cd hepatotoxicity. Nevertheless, simultaneous treatment with Se and Mg on Cd toxicity have strengthened protective effects than the supplementation of Se alone in the liver.

  19. Inhibition of diethylnitrosamine-induced liver cancer in rats by Rhizoma paridis saponin.

    Science.gov (United States)

    Liu, Jing; Man, Shuli; Li, Jing; Zhang, Yang; Meng, Xin; Gao, Wenyuan

    2016-09-01

    Rhizoma Paridis saponin (RPS) had been regarded as the main active components responsible for the anti-tumor effects of the herb Paris polyphylla var. yunnanensis (Franch.) Hand.-Mazz. In the present research, we set up a rat model of diethylnitrosamine (DEN) induced hepatoma to evaluate antitumor effect of RPS. After 20 weeks treatment, rats were sacrificed to perform histopathological examinations, liver function tests, oxidative stress assays and so forth. As a result, DEN-induced hepatoma formation. RPS alleviated levels of liver injury through inhibiting liver tissues of malondialdehyde (MDA) and nitric oxide (NO) formation, increasing superoxide dismutases (SOD) production, and up-regulating expression of GST-α/μ/π in DEN-induced rats. All in all, RPS would be a potent agent inhibiting chemically induced liver cancer in the prospective application.

  20. Investigation of biochemical and histopathological effects of Mentha piperita Labiatae and Mentha spicata Labiatae on liver tissue in rats.

    Science.gov (United States)

    Akdogan, M; Ozguner, M; Aydin, G; Gokalp, O

    2004-01-01

    The plant Mentha piperita, or peppermint, is commonly used in the treatment of loss of appetite, common cold, bronchitis, sinusitis, fever, nausea and vomiting, and indigestion as a herbal agent. In this study, we aimed to investigate biochemical and histological effects of M. piperita Labiatae, growing in the Yenisar Bademli town of Isparta city, and Mentha spicata Labiatae, growing in the Anamas high plateau of the Yenisar Bademli town, on the rat liver tissue. Forty-eight male Wistar albino rats weighing 200-250 g were used for this study. Rats were divided into four groups of 12 animals: Group I received no herbal tea (control group); Group II received 20 g/L M. piperita tea; Group III received 20 g/L M. spicata tea; and Group IV received 40 g/L M. spicata tea. Herbal teas were prepared daily and provided at all times to the rats during 30 days as drinking water. Liver function tests, including aspartate aminotransferase (AST/GOT) and alanine aminotransferase (ALT/GPT) activities were measured. To evaluate liver antioxidant defences, superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), catalase (CAT) and thiobarbituric acid reactive substance (TBARS) activities were determined in the homogenates of liver tissue. In addition, liver tissues were submitted for histopathologic examination. AST and ALT activities were increased in Group II, Group III and Group IV gradually when compared with the control group. The difference between Group II and the control group was not statistically significant (P > 0.016). Increases in AST and ALT activities of Group III and Group IV were statistically significant when compared with the control group. SOD, GSH-Px and CAT activities were increased in Group II when compared with the control group but the difference was not statistically significant (P > 0.016). However, SOD, GSH-Px activities and the TBARS level were significantly increased, and CAT activity was significantly decreased in Group III when compared with the

  1. 肝脏原位注射新生大鼠肝细胞构建的工程化肝组织对大鼠肝纤维化的影响%Engineered hepatic tissue based on newborn rat liver cells improved liver fibrosis in rats by orthotopic injection

    Institute of Scientific and Technical Information of China (English)

    周海洋; 郑爱民; 黄蓉蓉; 戴大江; 张海宏; 曹厚军

    2013-01-01

    目的:观察原位注射新生大鼠肝细胞构建的工程化肝组织对实验性肝纤维化大鼠血清和肝组织学的影响,探讨其抗肝纤维化的作用。方法用四氯化碳制成实验性肝纤维化造模大鼠,肝脏原位多点注射工程化肝组织,3周后测定血清肝功能并行肝组织学检查。结果原位注射组大鼠肝功能较单纯假手术组大鼠有改善,且具有显著差异(P<0.05),HE染色提示纤维化明显改善。结论肝脏原位多点注射新生大鼠肝细胞的工程化肝组织能改善大鼠肝纤维化进程,有一定抗肝纤维化作用。%Objective To observe the effecting on the content of liver function in serum and liver fibrosis index of experimental liver fibrogenesis rats,and investigate wether injection of hepatic constructs based on neonatal rat is provided with anti-liver fibrogenesis effect. Methods The rats were divided into two groups,and in group one,engineered hepatic grafts were implanted by orthotopically multi-spot injection. Liver cells isolated from from neonatal SD rats were mixed with liquid collagen prepared from SD rat tails.While group two received the same volume of saline solution.Liver function was evaluated by serum biological analysis at 10days. After 20days rats were killed,fibrosis index was examined by HE staining and Sirius red staining of liver tissue. Results Compared to controls,injection of hepatic constructs based on neonatal rat improve the liver function. Moreover,fibrosis index got more improvement in cell-matrix mixture than that in control group. Conclusion Multi-site injection of hepatic constructs based on neonatal rat liver cells in the liver can protect against experimental liver fibrosis in CCl4-induced rats and the mechanisms will be studied further.

  2. Environmentally persistent free radicals inhibit cytochrome P450 activity in rat liver microsomes

    Energy Technology Data Exchange (ETDEWEB)

    Reed, James R., E-mail: rreed@lsuhsc.edu [Department of Pharmacology and Experimental Therapeutics, Louisiana State University Health Science Center, 533 Bolivar St., New Orleans, LA 70112 (United States); The Stanley S. Scott Cancer Center, Louisiana State University Health Science Center, 533 Bolivar St., New Orleans, LA 70112 (United States); Cawley, George F.; Ardoin, Taylor G. [Department of Pharmacology and Experimental Therapeutics, Louisiana State University Health Science Center, 533 Bolivar St., New Orleans, LA 70112 (United States); The Stanley S. Scott Cancer Center, Louisiana State University Health Science Center, 533 Bolivar St., New Orleans, LA 70112 (United States); Dellinger, Barry; Lomnicki, Slawomir M.; Hasan, Farhana; Kiruri, Lucy W. [Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803 (United States); Backes, Wayne L. [Department of Pharmacology and Experimental Therapeutics, Louisiana State University Health Science Center, 533 Bolivar St., New Orleans, LA 70112 (United States); The Stanley S. Scott Cancer Center, Louisiana State University Health Science Center, 533 Bolivar St., New Orleans, LA 70112 (United States)

    2014-06-01

    Combustion processes generate particulate matter that affects human health. When incineration fuels include components that are highly enriched in aromatic hydrocarbons (especially halogenated varieties) and redox-active metals, ultrafine particulate matter containing air-stable, environmentally persistent free radicals (EPFRs) is generated. The exposure to fine EPFRs (less than 2.5 μm in diameter) has been shown to negatively influence pulmonary and cardiovascular functions in living organisms. The goal of this study was to determine if these EPFRs have a direct effect on cytochrome P450 function. This was accomplished by direct addition of the EPFRs to rat liver microsomal preparations and measurement of several P450 activities using form-selective substrates. The EPFRs used in this study were formed by heating vapors from an organic compound (either monochlorophenol (MCP230) or 1,2-dichlorobenzene (DCB230)) and 5% copper oxide supported on silica (approximately 0.2 μm in diameter) to 230 °C under vacuum. Both types of EPFRs (but not silica, physisorbed silica, or silica impregnated with copper oxide) dramatically inhibited the activities of CYP1A, CYP2B, CYP2E1, CYP2D2 and CYP3A when incubated at concentrations less than 0.1 mg/ml with microsomes and NADPH. Interestingly, at the same concentrations, the EPFRs did not inhibit HO-1 activity or the reduction of cytochrome c by NADPH-cytochrome P450 reductase. CYP2D2-selective metabolism by rat liver microsomes was examined in more detail. The inhibition of CYP2D2-selective metabolism by both DCB230- and MCP230-EPFRs appeared to be largely noncompetitive and was attenuated in the presence of catalase suggesting that reactive oxygen species may be involved in the mechanism of inhibition. - Highlights: • Combustion of organic pollutants generates long-lived particulate radicals (EPFRs). • EPFRs inhibit metabolism by all cytochromes P450 tested in rat liver microsomes. • EPFR-mediated inhibition is related to

  3. A simplified subnormothermic machine perfusion system restores ischemically damaged liver grafts in a rat model of orthotopic liver transplantation

    Directory of Open Access Journals (Sweden)

    Berendsen Tim A

    2012-05-01

    Full Text Available Abstract Background Liver donor shortages stimulate the development of strategies that incorporate damaged organs into the donor pool. Herein we present a simplified machine perfusion system without the need for oxygen carriers or temperature control, which we validated in a model of orthotopic liver transplantation. Methods Rat livers were procured and subnormothermically perfused with supplemented Williams E medium for 3 hours, then transplanted into healthy recipients (Fresh-SNMP group. Outcome was compared with static cold stored organs (UW-Control group. In addition, a rat liver model of donation after cardiac death was adapted using a 60-minute warm ischemic period, after which the grafts were either transplanted directly (WI group or subnormothermically perfused and transplanted (WI-SNMP group. Results One-month survival was 100% in the Fresh-SNMP and UW-Control groups, 83.3% in the WI-SNMP group and 0% in the WI group. Clinical parameters, postoperative blood work and histology did not differ significantly between survivors. Conclusion This work demonstrates for the first time in an orthotopic transplantation model that ischemically damaged livers can be regenerated effectively using practical subnormothermic machine perfusion without oxygen carriers.

  4. Metabolism and metabolic inhibition of gamboglc acid in rat liver microsomes

    Institute of Scientific and Technical Information of China (English)

    Yi-tong LIU; Kun HAO; Xiao-quan LIU; Guang-Ji WANG

    2006-01-01

    Aim: To study the metabolism of gambogic acid (GA) and the effects of selective cytochrome P-450 (CYP450) inhibitors on the metabolism of GA in rat liver microsomes in vitro. Methods: Rat liver micrp,so,rn,e$ were used to perform metabolism studies. Various selective CYP450 inhibitors were used to investigate their effects on the metabolism of GA and the principal CYP450 isoform involved in the formation of major metabolite M1 in rat liver microsomes. Types of inhibition in an enzyme kinetics model were used to model the interaction. Results: GA was rapidly metabolized to two phase Ⅰ metabolites,, M1 and M2, in rat liver microsomes. M1 and M2 were tentatively presumed to be the hydration metabolite and epoxide metabolite of GA, respectively. α-Naphthoflavone uncompetitively inhibited the formation of M1 while ketoconazole, sulfophenazole, diethyl dithiocarbamate and quinidine had little or no inhibitory effects on the formation of M1. Conclusion: GA is rapidly metabolized in rat liver microsomes and M1 is crucial for the elimination of GA. Cytochrome P-450 1A2 is the major rat CYP involved in the metabolism of GA.

  5. Therapeutic effect of Pleurotus eryngii cellulose on experimental fatty liver in rats.

    Science.gov (United States)

    Huang, J F; Zhan, T; Yu, X L; He, Q A; Huang, W J; Lin, L Z; Du, Y T; Pan, Y T

    2016-02-26

    The aim of this study was to explore the therapeutic effect of Pleurotus eryngii cellulose on experimental fatty liver in rats. Rats were fed high-fat fodder to establish a rat fatty liver model, and were then fed different concentrations of Pleurotus eryngii cellulose for six weeks. Lipitor was used as a positive control. Measured levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), total cholesterol (TC), and total triglyceride (TG); the activity of malondialdehyde (MDA), superoxide dismutase (SOD), hepatic lipase (HL), and lipoprotein lipase; and liver histopathological changes. Successfully established rat fatty liver model after feeding high-fat fodder for one week. A diet of P. eryngii cellulose for six weeks significantly reduced ALT, AST, TC, and TG levels in rat serum (P 0.05). SOD activity increased significantly, while MDA and HL activity decreased (P < 0.05); fatty degeneration and fat accumulation both decreased in hepatic tissue. Hepatic protection of P. eryngii cellulose showed dose-related effect. P. eryngii cellulose can affect lipid metabolism, having therapeutic effects on fatty liver in rats.

  6. Expression patterns and action analysis of genes associated with drug-induced liver diseases during rat liver regeneration

    Institute of Scientific and Technical Information of China (English)

    Qian-Ji Ning; Shao-Wei Qin; Cun-Shuan Xu

    2006-01-01

    AIM: To study the action of the genes associated with drug-induced liver diseases at the gene transcriptional level during liver regeneration (LR) in rats.METHODS: The genes associated with drug-induced liver diseases were obtained by collecting the data from databases and literature, and the gene expression changes in the regenerating liver were checked by the Rat Genome 230 2.0 array.RESULTS: The initial and total expression numbers of genes occurring in phases of 0.5-4 h after partial hepatectomy (PH), 4-6 h after PH (G0/G1 transition),6-66 h after PH (cell proliferation), 66-168 h after PH (cell differentiation and structure-function reconstruction) were 21, 3, 9, 2 and 21, 9, 19, 18, respectively. It is illustrated that the associated genes were mainly triggered at the initial stage of LR and worked at different phases. According to their expression similarity,these genes were classified into 5 types: only upregulated (12 genes), predominantly up-regulated (4genes), only down-regulated (11 genes), predominantly down-regulated (3 genes), and approximately up-/down-regulated (2 genes). The total times of their upand down-expression were 130 and 79, respectively,demonstrating that expression of most of the genes was increased during LR, while a few decreased. The cell physiological and biochemical activities during LR were staggered according to the time relevance and were diverse and complicated in gene expression patterns.CONCLUSION: Drug metabolic capacity in regenerating liver was enhanced. Thirty-two genes play important roles during liver regeneration in rats.

  7. Comparative metabolism, covalent binding and toxicity of BHT congeners in rat liver slices.

    Science.gov (United States)

    Reed, M; Fujiwara, H; Thompson, D C

    2001-11-28

    The metabolism, covalent binding and hepatotoxicity of butylated hydroxytoluene (BHT, 4-methyl-2,6-di-t-butylphenol) and two congeners (E-BHT, 4-ethyl-2,6-di-t-butylphenol; I-BHT, 4-isopropyl-2,6-di-t-butylphenol) were compared using precision-cut liver slices prepared from phenobarbital (PB)-treated male Sprague-Dawley rats. At equimolar concentrations (1 mM) BHT was the most toxic of the three compounds, causing an 80% decrease in cell viability over a 6 h incubation period. E-BHT was intermediate in toxicity while the isopropyl derivative was relatively nontoxic. Intracellular glutathione levels decreased prior to the onset of cytotoxicity. The cytochrome P450 inhibitor metyrapone completely inhibited the toxicity of all three compounds. The rates of metabolism of the three compounds to glutathione conjugates were compared in both PB-treated microsomes and PB-induced liver slices. In both models, the rate of formation was greatest for BHT, followed by E-BHT and I-BHT. Synthetic quinone methides (QMs) were prepared from each parent phenol and the rates of reactivity with three nucleophiles (water, methanol and glutathione) were compared. With each nucleophile, BHTQM was the most reactive, while I-BHTQM was the least reactive. Finally, covalent binding to protein was assessed in two ways. First, alkylation of an isolated model protein (bovine insulin) was measured in a microsomal enzyme activation system by mass spectrometry. Incubations with BHT produced the greatest extent of protein alkylation, followed by E-BHT, while no alkylation was observed with I-BHT. In the second system, covalent binding to cellular protein was assessed in rat liver PB microsomes and tissue slices by Western blotting using an antibody specific for the tert-butylphenol portion of the compounds. Binding was greatest for BHT, intermediate for E-BHT and could not be detected for I-BHT. The alkylation pattern for E-BHT was strikingly similar to that of BHT, suggesting that both compounds

  8. A new technique for accelerated liver regeneration: An experimental study in rats.

    Science.gov (United States)

    Andersen, Kasper Jarlhelt; Knudsen, Anders Riegels; Jepsen, Betina Norman; Meier, Michelle; Gunnarsson, Anders Patrik Alexander; Jensen, Uffe Birk; Nyengaard, Jens Randel; Hamilton-Dutoit, Stephen; Mortensen, Frank Viborg

    2017-08-01

    Associating liver partition and portal vein ligation for staged hepatectomy (ALPPS) is used to accelerate growth of the future liver remnant. We investigated alternative methods for increasing the future liver remnant. A total of 152 rats were randomized as follows: (1) sham; (2) portal vein ligation; (3) portal vein ligation/surgical split (ALPPS); (4) portal vein ligation/split of the liver with a radiofrequency ablation needle; (5) portal vein ligation/radiofrequency ablation of the deportalized liver (portal vein ligation/radiofrequency ablation necrosis in the deportalized liver); (6) portal vein ligation/radiofrequency ablation of the future liver remnant (portal vein ligation/radiofrequency ablation-future liver remnant); and (7) controls. Animals were evaluated on postoperative days 2 and 4. Bodyweight, liver parameters, hepatic regeneration rate, proinflammatory cytokines, hepatocyte proliferation, and gene expression were measured. Hepatic regeneration rate indicated a steady increase in all intervention groups compared with sham rats (P rats. On postoperative day 4, we found a significantly higher proliferation in groups 3, 4, 5, and 6 compared to portal vein ligation. Gene analysis revealed upregulation of genes involved in cellular proliferation and downregulation of genes involved in cellular homeostasis in all intervention groups. Between the intervention groups, gene expression was nearly identical. Biochemical markers and proinflammatory cytokines were comparable between groups. The surplus liver regeneration after ALPPS is probably mediated through parenchymal damage and subsequent release of growth stimulators, which again upregulates genes involved in cellular regeneration and downregulates genes involved in cellular homeostasis. We also demonstrate that growth of the future liver remnant, comparable to that seen after ALPPS, could be achieved by radiofrequency ablation treatment of the deportalized liver, that is, a procedure in which the

  9. Correlation of HIFs/PPAR signaling pathway activation degree and lipid metabolism in liver tissue of alcoholic fatty liver rat model

    Institute of Scientific and Technical Information of China (English)

    Li-Ying Guo; Ya-Min Li; Qing-Chun Li

    2015-01-01

    Objective:To study the correlation of HIFs/PPAR signaling pathway activation degree and lipid metabolism in liver tissue of alcoholic fatty liver rat model.Methods:Adult SD rats were selected and alcoholic fatty liver rat models were established by alcohol administration and high-fat diet feeding. Liver tissue was collected and contents of HIF-1α, PPARγ and lipid metabolism-related enzymes were detected; serum was collected and contents of lipid metabolism indexes and liver cell damage indexes were detected.Results:(1) one week, two weeks, three weeks and four weeks after models were established, HIF-1αα in livers of the model group showed an increasing trend and PPARγ showed a decreasing trend; HIF-1α content was higher than that of the control group and PPARγ content was lower than that of the control group; (2) contents of apoCII, apoCIII,α-GST and GLDH in serum as well as levels of FAT, FABP1, FAS, ACC and ACAT-2 in liver tissue of the model group all significantly increased, and were positively correlated with HIF-1α and negatively correlated with PPARγ.Conclusion:Transcription factor HIF-1α content abnormally increases and PPARγ content abnormally decreases in liver tissue of alcoholic fatty liver rat models; it results in abnormal lipid metabolism and liver cell damage through increasing the expression of lipid metabolism-related enzymes in the liver.

  10. Exposure to industrial wideband noise increases connective tissue in the rat liver

    Directory of Open Access Journals (Sweden)

    Maria João R Oliveira

    2012-01-01

    Full Text Available Rats were daily exposed (eight hours/day for a period of four weeks to the same high-intensity wideband noise that was recorded before in a large textile plant. Histologic observation of liver sections of the rats was used to perform quantitative comparison of hepatic connective tissue (dyed by Masson trichromic staining between the noise-exposed and control animals. For that, we have photographed at random centrolobular areas of stained rat liver sections. We found that noise exposure resulted in significant enhancement in the area of collagen-rich connective tissue present in the centrolobular domain of the rat liver. Our data strengthen previous evidence showing that fibrotic transformation is a systemic effect of chronic exposure of rodents and humans to industrial wideband noise.

  11. In vitro covalent binding of /sup 14/C-mibolerone to rat liver microsomes

    Energy Technology Data Exchange (ETDEWEB)

    Jaglan, P.S.

    1986-01-01

    Mibolerone (17-Hydroxy-7,17-dimethylestr-4-en-3-one; 7 alpha-17 alpha dimethyl-19-nortestosterone) is being marketed by The Upjohn Company for the inhibition of estrus in bitches. The aim of this study was to determine the extent of covalent binding of mibolerone to rat liver microsomes. Liver microsomes were obtained from Control and phenobarbitol-treated female Fisher rats, and were incubated with /sup 14/C-mibolerone at 37/sup 0/C for 10 minutes. No covalent binding to macromolecules was observed when /sup 14/C-mibolerone was incubated with rat liver microsomes. Under identical conditions, /sup 14/C-estradiol was covalently bound to macromolecules. Slightly higher covalent binding of estradiol was observed with microsomes from phenobarbitol-treated rats. Ascorbic acid and glutathione inhibited covalent binding of estradiol to macromolecules in the in vitro microsomal system.

  12. Ginger and alpha lipoic acid ameliorate age-related ultrastructural changes in rat liver.

    Science.gov (United States)

    Mahmoud, Y I; Hegazy, H G

    2016-01-01

    Because of the important role that oxidative stress is thought to play in the aging process, antioxidants could be candidates for preventing its related pathologies. We investigated the ameliorative effects of two antioxidant supplements, ginger and alpha lipoic acid (ALA), on hepatic ultrastructural alterations in old rats. Livers of young (4 months) and old (24 months) Wistar rats were studied using transmission electron microscopy. Livers of old rats showed sinusoidal collapse and congestion, endothelial thickening and defenestration, and inconsistent perisinusoidal extracellular matrix deposition. Aged hepatocytes were characterized by hypertrophy, cytoplasmic vacuolization and a significant increase in the volume densities of the nuclei, mitochondria and dense bodies. Lipofuscin accumulation and decreased microvilli in bile canaliculi and space of Disse also were observed. The adverse alterations were ameliorated significantly by both ginger and ALA supplementation; ALA was more effective than ginger. Ginger and ALA appear to be promising anti-aging agents based on their amelioration of ultrastructural alterations in livers of old rats.

  13. Decellularization and Recellularization of Rat Livers With Hepatocytes and Endothelial Progenitor Cells.

    Science.gov (United States)

    Zhou, Pengcheng; Huang, Yan; Guo, Yibing; Wang, Lei; Ling, Changchun; Guo, Qingsong; Wang, Yao; Zhu, Shajun; Fan, Xiangjun; Zhu, Mingyan; Huang, Hua; Lu, Yuhua; Wang, Zhiwei

    2016-03-01

    Whole-organ decellularization has been identified as a promising choice for tissue engineering. The aim of the present study was to engineer intact whole rat liver scaffolds and repopulate them with hepatocytes and endothelial progenitor cells (EPCs) in a bioreactor. Decellularized liver scaffolds were obtained by perfusing Triton X-100 with ammonium hydroxide. The architecture and composition of the original extracellular matrix were preserved, as confirmed by morphologic, histological, and immunolabeling methods. To determine biocompatibility, the scaffold was embedded in the subcutaneous adipose layer of the back of a heterologous animal to observe the infiltration of inflammatory cells. Hepatocytes were reseeded using a parenchymal injection method and cultured by continuous perfusion. EPCs were reseeded using a portal vein infusion method. Morphologic and functional examination showed that the hepatocytes and EPCs grew well in the scaffold. The present study describes an effective method of decellularization and recellularization of rat livers, providing the foundation for liver engineering and the development of bioartificial livers.

  14. Anti-inflammatory liposomes have no impact on liver regeneration in rats

    DEFF Research Database (Denmark)

    Jepsen, Betina Norman; Andersen, Kasper Jarlhelt; Knudsen, Anders Riegels;

    2015-01-01

    ; liver tissue was sampled for analysis of regeneration rate and proliferation index. Results: The high dose dexamethasone group had significantly lower body and liver weight than the placebo and anti-CD163-dex groups. There were no differences in liver regeneration rates between groups. Hepatocyte......Introduction: Surgical resection is the gold standard in treatment of hepatic malignancies, giving the patient the best chance to be cured. The liver has a unique capacity to regenerate. However, an inflammatory response occurs during resection, in part mediated by Kupffer cells, that influences...... the speed of regeneration. The aim of this study was to investigate the effect of a Kupffer cell targeted anti-inflammatory treatment on liver regeneration in rats. Methods: Two sets of animals, each including four groups of eight rats, were included. Paired groups from each set received treatment...

  15. Paradoxical increase in liver ketogenesis during long-term insulin-induced hypoglycemia in diabetic rats.

    Science.gov (United States)

    Schiavon, Fabiana P M; Gazola, Vilma A F G; Furlan, Maria M D P; Barrena, Helenton C; Bazotte, Roberto B

    2011-02-01

    It is well established that insulin inhibits liver ketogenesis. However, during insulin-induced hypoglycemia (IIH) the release of counterregulatory hormones could overcome the insulin effect on ketogenesis. To clarify this question the ketogenic activity in livers from alloxan-diabetic rats submitted to long-term IIH was investigated. Moreover, liver glycogenolysis, gluconeogensis, ureagenesis and the production of L-lactate were measured, and its correlation with blood levels of ketone bodies (KB), L-lactate, glucose, urea and ammonia was investigated. For this purpose, overnight fasted alloxan-diabetic rats (DBT group) were compared with control non-diabetic rats (NDBT group). Long-term IIH was obtained with an intraperitoneal injection of Detemir insulin (1 U/kg), and KB, glucose, L-lactate, ammonia and urea were evaluated at 0, 2, 4, 6, 8 or 10 h after insulin injection. Because IIH was well established two hours after insulin injection this time was used for liver perfusion experiments. The administration of Detemir insulin decreased (P < 0.05) blood KB and glucose levels, but there was an increase in the blood L-lactate levels and a rebound increase in blood KB during the glucose recovery phase of IIH. In agreement with these results, the capacity to produce KB from octanoate was increased in the livers of DBT rats. Moreover, the elevated blood L-lactate levels in DBT rats could be attributed to the higher (P < 0.05) glycogenolysis when part of glucose from glycogenolysis enters glycolysis, producing L-lactate. In contrast, except glycerol, gluconeogenesis was negligible in the livers of DBT rats. Therefore, during long-term IIH the higher liver ketogenic capacity of DBT rats increased the risk of hyperketonemia. In addition, in spite of the fact that the insulin injection decreased blood KB, there was a risk of worsening lactic acidosis.

  16. Convenient and efficient enrichment of the CD133+ liver cells from rat fetal liver as a source of liver stem/progenitor cells.

    Science.gov (United States)

    Liu, Weihui; You, Nan; Dou, Kefeng

    2012-01-01

    Although stem cells are commonly isolated by fluorescence-activated cell sorting or magnetic affinity cell sorting, they are very expensive, and they need known markers. However, there is no specific marker for liver stem/progenitor cells (LSPCs). Here, we describe a convenient and efficient method (three-step method) to enrich LSPCs. The fetal liver cells (FLCs) were firstly enriched by Percoll discontinuous gradient centrifugation from the rat fetal liver. Then the FLCs in culture were purified to be homogeneous in size by differential trypsinization and differential adherence. Finally, fetal liver stem/progenitor cells (FLSPCs) were enriched from purified FLCs by Percoll continuous gradient centrifugation. Flow cytometric analysis combining with marker CD133 was used to detect the purity of FLSPCs and evaluate the isolating effects of the three-step method.

  17. Environmentally Persistent Free Radicals Inhibit Cytochromes P450 Activity in Rat Liver Microsomes

    Science.gov (United States)

    Reed, James R.; Cawley, George F.; Ardoin, Taylor G.; Dellinger, Barry; Lomnicki, Slawomir M.; Hasan, Farhana; Kiruri, Lucy W.; Backes, Wayne L.

    2014-01-01

    Combustion processes generate particulate matter that affects human health. When incineration fuels include components that are highly enriched in aromatic hydrocarbons (especially halogenated varieties) and redox-active metals, ultrafine particulate matter containing air-stable, environmentally persistent free radicals (EPFRs) are generated. The exposure to fine EPFRs (less than 2.5 μm in diameter) has been shown to negatively influence pulmonary and cardiovascular functions in living organisms. The goal of this study was to determine if these EPFRs have a direct affect on cytochrome P450 function. This was accomplished by direct addition of the EPFRs to rat liver microsomal preparations and measurement of several P450 activities using form-selective substrates. The EPFRs used in this study were formed by heating vapors from an organic compound (either monochlorophenol (MCP230) or 1,2- dichlorobenzene (DCB230)) and 5% copper oxide supported on silica (approximately 0.2 μm in diameter) to 230°C under vacuum. Both types of EPFRs (but not silica, physisorbed silica, or silica impregnated with copper oxide) dramatically inhibited the activities of CYP1A, CYP2B, CYP2E1, CYP2D2 and CYP3A when incubated at concentrations less than 0.1 mg/ml with microsomes and NADPH. Interestingly, at the same concentrations, the EPFRs did not inhibit HO-1 activity or the reduction of cytochrome c by NADPH-cytochrome P450 reductase. CYP2D2-selective metabolism by rat liver microsomes was examined in more detail. The inhibition of CYP2D2-selective metabolism by both DCB230- and MCP230-EPFRs appeared to be largely noncompetitive and was attenuated in the presence of catalase suggesting that reactive oxygen species may be involved in the mechanism of inhibition. PMID:24713513

  18. Environmentally persistent free radicals inhibit cytochrome P450 activity in rat liver microsomes.

    Science.gov (United States)

    Reed, James R; Cawley, George F; Ardoin, Taylor G; Dellinger, Barry; Lomnicki, Slawomir M; Hasan, Farhana; Kiruri, Lucy W; Backes, Wayne L

    2014-06-01

    Combustion processes generate particulate matter that affects human health. When incineration fuels include components that are highly enriched in aromatic hydrocarbons (especially halogenated varieties) and redox-active metals, ultrafine particulate matter containing air-stable, environmentally persistent free radicals (EPFRs) is generated. The exposure to fine EPFRs (less than 2.5 μm in diameter) has been shown to negatively influence pulmonary and cardiovascular functions in living organisms. The goal of this study was to determine if these EPFRs have a direct effect on cytochrome P450 function. This was accomplished by direct addition of the EPFRs to rat liver microsomal preparations and measurement of several P450 activities using form-selective substrates. The EPFRs used in this study were formed by heating vapors from an organic compound (either monochlorophenol (MCP230) or 1,2-dichlorobenzene (DCB230)) and 5% copper oxide supported on silica (approximately 0.2 μm in diameter) to 230°C under vacuum. Both types of EPFRs (but not silica, physisorbed silica, or silica impregnated with copper oxide) dramatically inhibited the activities of CYP1A, CYP2B, CYP2E1, CYP2D2 and CYP3A when incubated at concentrations less than 0.1 mg/ml with microsomes and NADPH. Interestingly, at the same concentrations, the EPFRs did not inhibit HO-1 activity or the reduction of cytochrome c by NADPH-cytochrome P450 reductase. CYP2D2-selective metabolism by rat liver microsomes was examined in more detail. The inhibition of CYP2D2-selective metabolism by both DCB230- and MCP230-EPFRs appeared to be largely noncompetitive and was attenuated in the presence of catalase suggesting that reactive oxygen species may be involved in the mechanism of inhibition.

  19. Degradation of methyl and ethyl mercury into inorganic mercury by hydroxyl radical produced from rat liver microsomes

    Energy Technology Data Exchange (ETDEWEB)

    Suda, Ikuo (Kumamoto Univ. (Japan). Dept. of Pharmacology); Hirayama, Kimiko (Kumamoto Univ. (Japan). Coll. of Medical Science)

    1992-07-01

    Liver microsomes were prepared from Wistar rat by the Ca{sup 2+} aggregation method. Under various conditions, ethyl mercury chloride (EtHgCl) or methyl mercury chloride (MeHgCl) was incubated with the microsomal preparations. After the incubation, the amounts of inorganic Hg and hydroxyl radical (.OH) in the preparations were determined. Although the preparations alone produced a small amount of inorganic Hg and .OH, the addition of NADPH to the preparations increased both inorganic Hg and .OH production, which were further accelerated by the addition of KCN. The addition of Fe(III)EDTA, a .OH formation promoter, to the microsome-NADPH-KCN system increased inorganic Hg production, whereas the addition of diethylenetriamine pentaacetic acid, a .OH formation inhibitor, decreased inorganic Hg production. When .OH scavengers such as mannitol and dimethyl sulfoxide were added to this system, the inorganic Hg production decreased. These results suggested that the .OH produced from liver microsomes was responsible for the degradation of MeHg and EtHg. Since both .OH and inorganic Hg production decreased with a concomitant decrease in NADPH-cytochrome P-450 reductase activities, it is suggested that this enzyme may be involved in the microsomal degradation of MeHg and EtHg. (orig.).

  20. Effects of Radix Puerariae flavones on liver lipid metabolism in ovariectomized rats

    Institute of Scientific and Technical Information of China (English)

    Ji-Feng Wang; Yan-Xia Guo; Jan-Zhao Niu; Juan Liu; Ling-Qiao Wang; Pei-Heng Li

    2004-01-01

    AIM: To study the effects of Radix Puerariae flavones (RPF)on liver lipid metabolism in ovariectomized (OVX) rats.METHODS: Forty adult female Wistar rats were randomly divided into four groups: OVX group; sham-OVX group;OVX+estrogen group and OVX+RPF group. One week after operation rats of the first two groups were treated with physiological saline, rats of OVX+estrogen group with estrogen (1 mg/kg.b.w.) and rats of OVX+RPF group with RPF (100 mg/kg.b.w.), respectively for 5 weeks. After the rats were killed, their body weight, the weight of the abdominal fat and uterus were measured, and the levels of total cholesterol (TC) and triglyceride (TG) in liver homogenate were determined.RESULTS: Compared with the sham-OVX group, the body mass of the rats in OVX group was found increased significantly;more abdominal fat in store; TC and TG in liver increased and uterine became further atrophy. As a result, the RPF was found to have an inhibitive action on those changes of various degrees.CONCLUSION: RPF has estrogen-like effect on lipid metabolism in liver and adipose tissue.

  1. In vitro antioxidant capacity of tea of Echinodorus grandiforus, “leather hat,” in Wistar rat liver

    Directory of Open Access Journals (Sweden)

    RAFAELA F. LUNARDI

    2014-09-01

    Full Text Available Oxidative stress has been considered as one of the factors responsible for hepatic diseases, which sometimes require new ways of treatment. The present study aimed to evaluate the in vitro antioxidant capacity of the tea of Echinodorus grandiforus (“leather hat” plant in rat liver. Different preparations of tea were evaluated for phenolic composition, antioxidant activity by DPPH assay and ability to inhibit lipid peroxidation induced by copper sulfate. The antioxidant activity was assessed in liver tissue treated with sodium azide in the presence or absence of tea by assays for lipid peroxidation (TBARS, protein oxidation (carbonyl and the antioxidant enzymes catalase (CAT and superoxide dismutase (SOD. The results show that different preparations of tea are important sources of polyphenols and contain theobromine, catechin and vitexin. Furthermore, the results indicate that this tea exhibits an antioxidant activity by its ability to scavenge DPPH radical. Different preparations of tea prevented damage to lipids and proteins induced by sodium azide, as well as assisting in restoring CAT and SOD activities. Thus, it can be seen that E. grandiforus tea had antioxidant activity in serum and liver being able to prevent oxidative damages generated by sodium azide.

  2. Normothermic machine perfusion reduces bile duct injury and improves biliary epithelial function in rat donor livers.

    Science.gov (United States)

    Op den Dries, Sanna; Karimian, Negin; Westerkamp, Andrie C; Sutton, Michael E; Kuipers, Michiel; Wiersema-Buist, Janneke; Ottens, Petra J; Kuipers, Jeroen; Giepmans, Ben N; Leuvenink, Henri G D; Lisman, Ton; Porte, Robert J

    2016-07-01

    Bile duct injury may occur during liver procurement and transplantation, especially in livers from donation after circulatory death (DCD) donors. Normothermic machine perfusion (NMP) has been shown to reduce hepatic injury compared to static cold storage (SCS). However, it is unknown whether NMP provides better preservation of bile ducts. The aim of this study was to determine the impact of NMP on bile duct preservation in both DCD and non-DCD livers. DCD and non-DCD livers obtained from Lewis rats were preserved for 3 hours using either SCS or NMP, followed by 2 hours ex vivo reperfusion. Biomarkers of bile duct injury (gamma-glutamyltransferase and lactate dehydrogenase in bile) were lower in NMP-preserved livers compared to SCS-preserved livers. Biliary bicarbonate concentration, reflecting biliary epithelial function, was 2-fold higher in NMP-preserved livers (P < 0.01). In parallel with this, the pH of the bile was significantly higher in NMP-preserved livers (7.63 ± 0.02 and 7.74 ± 0.05 for non-DCD and DCD livers, respectively) compared with SCS-preserved livers (7.46 ± 0.02 and 7.49 ± 0.04 for non-DCD and DCD livers, respectively). Scanning and transmission electron microscopy of donor extrahepatic bile ducts demonstrated significantly decreased injury of the biliary epithelium of NMP-preserved donor livers (including the loss of lateral interdigitations and mitochondrial injury). Differences between NMP and SCS were most prominent in DCD livers. Compared to conventional SCS, NMP provides superior preservation of bile duct epithelial cell function and morphology, especially in DCD donor livers. By reducing biliary injury, NMP could have an important impact on the utilization of DCD livers and outcome after transplantation. Liver Transplantation 22 994-1005 2016 AASLD.

  3. Mechanism of enhanced lipid peroxidation in the liver of Long-Evans cinnamon (LEC) rats.

    Science.gov (United States)

    Yamamoto, H; Hirose, K; Hayasaki, Y; Masuda, M; Kazusaka, A; Fujita, S

    1999-11-01

    The Long-Evans Cinnamon (LEC) rat is a mutant strain of rats that accumulate copper (Cu) in the liver in much the same way as individuals who suffer from Wilson's disease (WD) and has been suggested as a model for this disease. Lipid peroxidation (LPO) is considered to be involved in the toxic action of Cu in the livers of LEC rats. We investigated the mechanism of LPO in the livers of LEC rats showing apparent signs of hepatitis. Several-fold higher LPO levels were observed in post-mitochondrial supernatant (S-9) fraction of livers from hepatitic LEC rats than in those from Wistar rats. To mimic living cells, we introduced NADPH-generating system (NADPH-gs) into the S-9 incubation system. Thus was ensured a constant supply of NADPH to vital enzymes that may be directly or indirectly involved in the generation and/or elimination of reactive oxygen species (ROSs), such as glutathione reductase (GSSG-R), which require NADPH for their reactions. The levels of LPO in liver S-9 from hepatitic LEC rats were further increased by incubating liver S-9 at 37 degrees C in the presence of NADPH-gs. This increase was inhibited by EDTA, butylated hydroxytoluene (BHT), and catalase (CAT), suggesting that some metal, most likely the accumulated Cu, and ROSs derived from hydrogen peroxide (H2O2) are involved in the increased levels of LPO in the livers of hepatitic LEC rats. The requirement of NADPH-gs for enhanced LPO in the livers of hepatitic LEC rats indicates the consumption of NADPH during reactions leading to LPO. It is known that H2O2, and consequently hydroxyl radical are generated during Cu-catalyzed glutathione (GSH) oxidation. The cyclic regeneration of GSH from GSSG by NADPH-dependent GSSG-R in the presence of NADPH-gs may cause sustained generation of hydroxyl radical in the presence of excess free Cu. The generation of H2O2 in S-9 fraction of livers from hepatitic LEC rats was observed to be significantly higher than that in S-9 fraction of livers from non

  4. The mechanisms underlying the hypolipidaemic effects of Grifola frondosa in the liver of rats

    Directory of Open Access Journals (Sweden)

    Yinrun Ding

    2016-08-01

    Full Text Available The present study investigated the hypolipidaemic effects of Grifola frondosa and its regulation mechanism involved in lipid metabolism in liver of rats fed a high-cholesterol diet. The body weights and serum lipid levels of control rats, of hyperlipidaemic rats and of hyperlipidaemic rats treated with oral Grifola frondosa were determined. mRNA expression and concentration of key lipid metabolism enzymes were investigated. Serum cholesterol, triacylglycerol and low-density lipoprotein cholesterol levels were markedly decreased in hyperlipidaemic rats treated with Grifola frondosa compared with untreated hyperlipidaemic rats. mRNA expression of 3-hydroxy-3-methylglutaryl-CoA reductase (HMGCR, acyl-coenzyme A: cholesterol acyltransferase (ACAT2, apolipoprotein B (ApoB, fatty acid synthase (FAS and acetyl-CoA carboxylase (ACC1 were significantly down-regulated, while expression of cholesterol 7-alpha-hydroxylase (CYP7A1 was significantly up-regulated in the livers of treated rats compared with untreated hyperlipidaemic rats. The concentrations of these enzymes also paralleled the observed changes in mRNA expression. Two-dimensional polyacrylamide gel electrophoresis (2-DE and Matrix-Assisted Laser Desorption/Ionization Time of Flight Mass Spectrometry (MALDI-TOF-MS were used to identify twenty proteins differentially expressed in livers of rats treated with Grifola frondosa compared with untreated hyperlipidemic rats. Of these twenty proteins, seven proteins were down-regulated and thirteen proteins were up-regulated. These findings indicate that the hypolipidaemic effects of Grifola frondosa reflected its modulation of key enzymes involved in cholesterol and triacylglycerol biosynthesis, absorption and catabolic pathways. Grifola frondosa may exert anti-atherosclerotic effects by inhibiting LDL oxidation through down-regulation and up-regulating proteins expression in the liver of rats. Therefore, Grifola frondosa may produce both hypolipidaemic

  5. An alpha-glucose-1-phosphate phosphodiesterase is present in rat liver cytosol

    Energy Technology Data Exchange (ETDEWEB)

    Srisomsap, C.; Richardson, K.L.; Jay, J.C.; Marchase, R.B. (Univ. of Alabama, Birmingham (USA))

    1989-12-05

    UDP-glucose:glycoprotein glucose-1-phosphotransferase (Glc-phosphotransferase) catalyzes the transfer of alpha-Glc-1-P from UDP-Glc to mannose residues on acceptor glycoproteins. The predominant acceptor for this transfer in both mammalian cells and Paramecium is a cytoplasmic glycoprotein of 62-63 kDa. When cytoplasmic proteins from rat liver were fractionated by preparative isoelectric focusing following incubation of a liver homogenate with the 35S-labeled phosphorothioate analogue of UDP-Glc ((beta-35S)UDP-Glc), the acceptor was found to have a pI of about 6.0. This fraction, when not labeled prior to the focusing, became very heavily labeled when mixed with (beta-35S). UDP-Glc and intact liver microsomes, a rich source of the Glc-phosphotransferase. In addition, it was observed that the isoelectric fractions of the cytosol having pI values of 2-3.2 contained a degradative activity, alpha-Glc-1-P phosphodiesterase, that was capable of removing alpha-Glc-1-P, monitored through radioactive labeling both in the sugar and the phosphate, as an intact unit from the 62-kDa acceptor. Identification of the product of this cleavage was substantiated by its partial transformation to UDP-Glc in the presence of UTP and UDP-Glc pyrophosphorylase. The alpha-Glc-1-P phosphodiesterase had a pH optimum of 7.5 and was not effectively inhibited by any of the potential biochemical inhibitors that were tested. Specificity for the Glc-alpha-1-P-6-Man diester was suggested by the diesterase's inability to degrade UDP-Glc or glucosylphosphoryldolichol. This enzyme may be important in the regulation of secretion since the alpha-Glc-1-P present on the 62-kDa phosphoglycoprotein appears to be removed and then rapidly replaced in response to secretagogue.

  6. Maternal saturated-fat-rich diet promotes leptin resistance in fetal liver lipid catabolism and programs lipid homeostasis impairments in the liver of rat offspring.

    Science.gov (United States)

    Mazzucco, María Belén; Fornes, Daiana; Capobianco, Evangelina; Higa, Romina; Jawerbaum, Alicia; White, Verónica

    2016-01-01

    We aimed to analyze if an overload of saturated fat in maternal diet induced lipid metabolic impairments in livers from rat fetuses that persist in the offspring and to identify potential mechanisms involving fetal leptin resistance. Female rats were fed either a diet enriched in 25% of saturated fat (SFD rats) or a regular diet (controls). Fetuses of 21days of gestation and offspring of 21 and 140days of age were obtained and plasma and liver were kept for further analysis. Livers from a group of control and SFD fetuses were cultured in the presence or absence of leptin. Leptin or vehicle was administered to control fetuses during the last days of gestation and, on day 21, fetal livers and plasma were obtained. Lipid levels were assessed by thin-layer chromatography and mRNA gene expression of CPT1, ACO and PPARα by RT-PCR. Liver lipid levels were increased and CPT1 and ACO were down-regulated in fetuses and offspring from SFD rats compared to controls. After the culture with leptin, control fetal livers showed increased ACO and CPT1 expression and decreased lipid levels, while fetal livers from SFD rats showed no changes. Fetal administration of leptin induced a decrease in ACO and no changes in CPT1 expression. In summary, our results suggest that a saturated fat overload in maternal diet induces fetal leptin resistance in liver lipid catabolism, which might be contributing to liver lipid alterations that are sustained in the offspring.

  7. Effects of Kupffer cell inactivation on graft survival and liver regeneration after partial liver transplantation in rats

    Institute of Scientific and Technical Information of China (English)

    Hang-Yu Luo; Shan-Fang Ma; Ji-Fu Qu; De-Hu Tian

    2015-01-01

    BACKGROUND: Gadolinium chloride (GdCl3) selectively in-activates Kupffer cells and protects against ischemia/reperfu-sion and endotoxin injury. However, the effect of Kupffer cell inactivation on liver regeneration after partial liver transplan-tation (PLTx) is not clear. This study was to investigate the role of GdCl3 pretreatment in graft function after PLTx, and to explore the potential mechanism involved in this process. METHODS: PLTx (30% partial liver transplantation) was per-formed using Kamada's cuff technique, without hepatic artery reconstruction. Rats were randomly divided into the control low-dose (5 mg/kg) and high-dose (10 mg/kg) GdCl3 groups. Liver injury was determined by the plasma levels of alanine aminotransferase and aspartate aminotransferase, liver regen-eration by PCNA staining and BrdU uptake, apoptosis by TU-NEL assay. IL-6 and p-STAT3 levels were measured by ELISA and Western blotting. RESULTS: GdCl3 depleted Kupffer cells and decreased animal survival rates, but did not significantly affect alanine amino-transferase and aspartate aminotransferase (P>0.05). GdCl3 pretreatment induced apoptosis and inhibited IL-6 overex-pression and STAT3 phosphorylation after PLTx in graft tissues. CONCLUSION: Kupffer cells may contribute to the liver re-generation after PLTx through inhibition of apoptosis and activation of the IL-6/p-STAT3 signal pathway.

  8. Metabolism of aildenafil in vivo in rats and in vitro in mouse, rat, dog, and human liver microsomes.

    Science.gov (United States)

    Li, Yan; Wu, Linan; Gu, Yuan; Si, Duanyun; Liu, Changxiao

    2014-06-01

    Aildenafil, 1-{[3-(6, 7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo [4, 3-d] primidin-5-yl)-4-ethoxyphenyl] sulfonyl}-cis-3, 5-dimethylpiperazine, a phosphodiesterase type V enzyme inhibitor (PDE5I), is under development for treatment of erectile dysfunction (ED). The purpose of this study was to elucidate metabolism of aildenafil in vivo in rats and in vitro in mouse, rat, dog, and human liver microsomes. Thirty-one phase I metabolites have been found by LTQ/Orbitrap hybrid mass spectrometry in rat urine, faeces, and bile after oral administration. Major biotransformation pathways of aildenafil included N-dealkylation of the piperazine ring, hydroxylation and dehydrogenation, aliphatic hydroxylation and loss of alkyl group of piperazine ring. Minor pathways involved hydroxylation on the phenyl ring, pyrazole N-demethylation, O-deethylation, loss of piperazine ring (cleavage of N-S bond) and dehydrogenation on the piperazine ring. Similar metabolic pathways of aildenafil were observed in the incubations of liver microsomes from mouse, rat, and dog as well as from human. The depletion rate of parent drug in mouse and rat liver microsomes was significantly different from that in human liver microsomes. The cytochrome P450 reaction phenotyping analysis was conducted using isozyme-specific inhibitors. The results indicated that CYP3A was the main isoenzyme involved in oxidative metabolism of aildenafil. Overall, these in vitro and in vivo findings should provide valuable information on possible metabolic behaviours of aildenafil in humans.

  9. Effects of hepatotrophic factors on the liver after portacaval shunt in rats with portal hypertension

    Institute of Scientific and Technical Information of China (English)

    ZHANG Zhong-tao; JIANG Peng; WANG Yu; LI Jian-she; XUE Jian-guo; ZHOU Yan-zhong; YUAN Zhu

    2006-01-01

    Background Portacaval shunt (PCS) prevent hepatotrophic factors from flowing into the liver, but they enter directly the systemic circulation and worsen liver injury. This study was designed to investigate the effects of hepatotrophic factors through the portal vein on the liver in rats with portal hypertension after portacaval shunt.Methods Intrahepatic portal hypertension (IHPH) was induced by intragastric administration of carbon tetrachloride, and end-to-side PCS was performed. Eight normal rats served as controls, and eight rats with IHPH served as IHPH model (IHPH group). Another 32 rats with IHPH-PCS were randomly subdivided into 4 groups:normal saline (NS) given to 8 rats, hepatocyte growth factor (HGF) 8, insulin (INS) 8, hepatocyte growth factor and insulin (HGF+INS) 8. Hepatotrophic factors were infused into the portal vein through an intravenous catheter.Portal venous pressure (PVP) was measured. The levels of serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) were tested biochemically and those of hyaluronic acid (HA) and laminin (LN) were measured by radioimmunoassay. Hepatic fibrosis was assessed histologically and the expression of collagens type Ⅰ and Ⅲ were detected immunohistochemically. Ultrastructural change of hepatocytes and the number of mitochondria were observed under an electron microscope. The data were compared between groups and subgroups by Student-Newman-Keuls procedure with SPSS 10.0.Results PVP was significantly higher in the IHPH rats than in the control rats (P<0.05). The levels of serum ALT, AST, HA, and LN, hepatic fibrosis score, the amount of collagen deposition, collagens type Ⅰ and Ⅲ increased more significantly in the IHPH group than in the control rats (P<0.05). The number of mitochondria decreased more significantly in the IHPH rats than in the control rats (P<0.05). The levels of serum ALT, AST,HA and LN as well as hepatic fibrosis score, the amount of collagen deposition, and the

  10. Effect of the Human Amniotic Membrane on Liver Regeneration in Rats

    Science.gov (United States)

    Sipahi, Mesut; Şahin, Sevinç; Arslan, Ergin; Börekci, Hasan; Metin, Bayram; Cantürk, Nuh Zafer

    2015-01-01

    Introduction. Operations are performed for broader liver surgery indications for a better understanding of hepatic anatomy/physiology and developments in operation technology. Surgery can cure some patients with liver metastasis of some tumors. Nevertheless, postoperative liver failure is the most feared complication causing mortality in patients who have undergone excision of a large liver mass. The human amniotic membrane has regenerative effects. Thus, we investigated the effects of the human amniotic membrane on regeneration of the resected liver. Methods. Twenty female Wistar albino rats were divided into control and experimental groups and underwent a 70% hepatectomy. The human amniotic membrane was placed over the residual liver in the experimental group. Relative liver weight, histopathological features, and biochemical parameters were assessed on postoperative day 3. Results. Total protein and albumin levels were significantly lower in the experimental group than in the control group. No difference in relative liver weight was observed between the groups. Hepatocyte mitotic count was significantly higher in the experimental group than in the control group. Hepatic steatosis was detected in the experimental group. Conclusion. Applying the amniotic membrane to residual liver adversely affected liver regeneration. However, mesenchymal stem cell research has the potential to accelerate liver regeneration investigations. PMID:26457000

  11. Effect of the Human Amniotic Membrane on Liver Regeneration in Rats

    Directory of Open Access Journals (Sweden)

    Mesut Sipahi

    2015-01-01

    Full Text Available Introduction. Operations are performed for broader liver surgery indications for a better understanding of hepatic anatomy/physiology and developments in operation technology. Surgery can cure some patients with liver metastasis of some tumors. Nevertheless, postoperative liver failure is the most feared complication causing mortality in patients who have undergone excision of a large liver mass. The human amniotic membrane has regenerative effects. Thus, we investigated the effects of the human amniotic membrane on regeneration of the resected liver. Methods. Twenty female Wistar albino rats were divided into control and experimental groups and underwent a 70% hepatectomy. The human amniotic membrane was placed over the residual liver in the experimental group. Relative liver weight, histopathological features, and biochemical parameters were assessed on postoperative day 3. Results. Total protein and albumin levels were significantly lower in the experimental group than in the control group. No difference in relative liver weight was observed between the groups. Hepatocyte mitotic count was significantly higher in the experimental group than in the control group. Hepatic steatosis was detected in the experimental group. Conclusion. Applying the amniotic membrane to residual liver adversely affected liver regeneration. However, mesenchymal stem cell research has the potential to accelerate liver regeneration investigations.

  12. Biochemical changes and oxidative stress induced by zearalenone in the liver of pregnant rats.

    Science.gov (United States)

    Zhou, C; Zhang, Y; Yin, S; Jia, Z; Shan, A

    2015-01-01

    The aim of the present research was to examine the toxic influence of different doses of zearalenone (ZEN) on the liver, especially oxidative stress induced by ZEN on the liver. A total of 48 pregnant Sprague-Dawley rats were randomly assigned into 4 treatments groups with 12 animals in each. The rats were fed with a normal diet treated with 0 mg/kg (control), 50 mg/kg (treatment 1), 100 mg/kg (treatment 2), or 150 mg/kg (treatment 3) ZEN in feed on gestation days (GDs) 0-7 and then all the rats were fed with a normal diet on GDs 8-20. The experimental period lasted 21 days. The results showed that exposure to ZEN induced increase in aspartate amino transferase, alanine aminotransferase, and alkaline phosphatase activities and decrease in total protein and albumin content in a dose-dependent manner and also induce decrease in superoxide dismutase and glutathione peroxidase activities and increase in malondialdehyde content in a dose-dependent manner in the serum and the liver. The increased transcription of cytochrome P450 2E1 (CYP2E1) was detected in the liver after exposure to ZEN. These results suggested that ZEN not only caused damage in the liver of pregnant rats in a dose-dependent manner but also induced the messenger RNA expression of CYP2E1 in the liver. © The Author(s) 2014.

  13. [Regulation of autophagy on dendritic cells during rat liver regeneration by IPA].

    Science.gov (United States)

    Qiwen, Wang; Wei, Jin; Cuifang, Chang; Cunshuan, Xu

    2015-03-01

    To understand the mechanism underlying autophagy in regulating dendritic cells during rat liver regeneration, we used the method of percoll density gradient centrifugation combined with immunomagnetic bead to isolate dendritic cells, the Rat Genome 230 2.0 Array to determine the expression changes of autophagy-related genes, and Ingenuity Pathway Analysis 9.0 (IPA) to determine the autophagy activities. The results indicated that LC3, BECN1, ATG7 and SQSTM1 genes had significant expression changes during rat liver regeneration. There were 593 genes related to autophagy, among which 210 genes were identified as significant. We also showed that the activity of autophagy was enhanced in the priming phase and teminal phase of liver regeneration, weakened in the proliferative stage by comparative analysis method of IPA. The autophagy-related physiological activities mainly included RNA expression, RNA transcription, cell differentiation and proliferation, involving in PPARα/RXRα activation, acute phase response signaling, TREM1 signaling, IL-6 signaling, IL-8 signaling and IL-1 signaling, whose activities were increased or decreased in liver regeneration. Cluster analysis found that P53 and AMPK signaling participated in the regulation of dendritic cells autophagy, with AMPK signaling in the priming phase of liver regeneration, and both signaling pathways in the terminal phase. We conclude that dendritic cells autophagy played an important role in initiation of the immune response in priming phase and depletion of dendritic cells in late phase during rat liver regeneration.

  14. Iron deposition and fat accumulation in dimethylnitrosamine-induced liver fibrosis in rat

    Institute of Scientific and Technical Information of China (English)

    Jin-Yang He; Wen-Hua Ge; Yuan Chen

    2007-01-01

    AIM: To investigate if iron deposition and fat accumulation in the liver play a pathogenetic role in dimethylnitrosamine (DMN)-induced liver fibrosis in rat.METHODS: Thirty rats were treated with DMN at does consecutive days of 10 μL/kg daily, i.p., for 3 consecutive day each week for 4 wk. Rats (n = 30) were sacrificed on the first day (model group A) and 21st d (model group B) after cessation of DMN injection. The control group (n = 10) received an equivalent amount of saline. Liver tissues were stained with hematoxylin & eosin (HE) and Masson and Prussian blue assay and oberserved under electron microscopy. Serum alanine aminotransferase (ALT)and liver tissue hydroxyproline (Hyp) content were tested.RESULTS: The liver fibrosis did not automaticallyreverse, which was similar to previous reports, the perilobular deposition of iron accompanied with collagen showed marked characteristics at both the first and 21st d after cessation of DMN injection. However, fat accumulation in hepatocytes occurred only at the 21st d after cessation of DMN injection.CONCLUSION: Iron deposition and fat accumulation may play important roles in pathological changes in DMN-induced rat liver fibrosis. The detailed mechanisms of these characteristics need further research.

  15. Rat gracilis muscle preparation for combined macro- and microvascular research.

    Science.gov (United States)

    Swain, D P; Lalone, B J

    1982-04-01

    A skeletal muscle preparation for the study of single vessel and whole organ vascular responses is presented. After surgical isolation from anesthetized rats, the gracilis muscle preparation is autoperfused via cannulation circuits. This allows the measurement of, and experimental control over, such macrovascular parameters as arterial and venous pressures and total muscle blood flow. In addition, the preparation is thin enough to allow the simultaneous study of microvessels by transilluminated microscopy. Such dual capabilities allow the preparation to be used in a wide variety of investigations and, in particular, as a primary tool in correlating microcirculatory responses with those of the whole organ in experiments designed to elucidate local control mechanisms of skeletal muscle vasculature. An example of such is demonstrated for reactive hyperemia responses simultaneously obtained at arteriolar and muscle venous effluent locations.

  16. Protective Effect of the Persian Gulf brittle star Ophiocoma Erinaceus extract on carbon tetrachloride (CCl4 induced liver damage in adult male Wistar rats

    Directory of Open Access Journals (Sweden)

    Aida Soheili

    2015-12-01

    Full Text Available Background and Aim:  Brittle star possess  bioactive compounds which confer the wound healing capacity and regenerative potency of damaged  arms and organisms to this creature. The aim of the current study was to assess the   protective  effect  of  the  star extract on liver damages induced by carbon tetrachloride in adult male Wistar rats. Materials and Methods: In this experimental study, 32 adult male rats were randomly divided into 4 equal groups: control, Sham exposed, experimental 1 (treated with %25 extract and experimental 2 (treated with %50 extract of star Ophiocoma Erinaceus. The control group received no treatment. The sham exposed groups received carbon tetrachloride .(50% in olive oil .0.5 ml/kg for 7 days. The experimental groups firstly received carbon tetrachloride, then received %25, %50 brittle star extract as intragastric for 7 days. Finally, the animals were sacrificed, and their bodies and livers were weighed. Then, the livers sections were prepared and were examined by means of light microscope. Finally, the obtained  quantitative data was analyzed using SPSS (V; 20, Mini Tab software, ANOVA, and Tukey. at the significant level of P<0.001. Results: Carbon tetrachloride significantly decreased the rats’ body weight, but it increased their livers weight (P<0.001. Histopathological evaluations showed .extensive liver damage. On the other hand, treatment with brittle star extract .ncreased liver weight, reduced. body weight and significantly altered other induced changes by carbon tetrachloride on liver structure such as hepatocytes number, Kupffer cells, and arteritis, which indicated  the improvement of damaged liver tissue (P<0.001. Conclusion: It was found that brittle star extract can exert protective effects on  liver damages induced by carbon tetrachloride on male Wistar rat.

  17. Protective effect of black tea on integral membrane proteins in rat liver.

    Science.gov (United States)

    Szachowicz-Petelska, Barbara; Skrzydlewska, Elżbieta; Figaszewski, Zbigniew

    2013-01-01

    Ethanol intoxication is accompanied by oxidative stress formation. Consequently, it leads to disturbances in cellular metabolism that can alter the structure and function of cell membrane components. Black tea displays antioxidant properties, protects membrane phospholipids and may protect integral membrane proteins. In the present study, we examined whether black tea induces changes in the liver integral membrane proteins of 12-months old rats chronically intoxicated with ethanol. To estimate qualitatively and quantitatively the levels of the liver integral membrane proteins, the proteins were selectively hydrolyzed by trypsin, the obtained peptides were resolved by HPLC and the levels of specific amino acids within the individual peptides were determined. All of the obtained peptides contained phenylalanine (Phe), cysteine (Cys) and lysine (Lys). Compared to the control group, rats in the ethanol intoxication group showed decreased liver levels of integral membrane proteins as well as fewer trypsin-hydrolyzed peptides and amino acids in the hydrolyzed peptides. Administration of black tea to ethanol-intoxicated rats partially protected proteins against the structural changes caused by ethanol. Black tea prevented decreases in the levels of cysteine (in about 90% of cases), lysine (in about 60% of cases), phenylalanine (in about 70% of cases) and examined peptides (in about 60% of cases). The liver protein level was higher (by about 18%) in rats who received black tea and ethanol than in those who received ethanol alone. In conclusion, black tea partially protects the composition and level of rat liver cell integral membrane proteins against changes caused by ethanol intoxication.

  18. Carcinogenic risk of copper gluconate evaluated by a rat medium-term liver carcinogenicity bioassay protocol

    Energy Technology Data Exchange (ETDEWEB)

    Abe, Masayoshi; Usuda, Koji; Hayashi, Seigo; Ogawa, Izumi; Furukawa, Satoshi [Nissan Chemical Industries Limited, Toxicology and Environmental Science Department, Biological Research Laboratories, Saitama (Japan); Igarashi, Maki [Tokyo University of Agriculture, Laboratory of Protection of Body Function, Department of Food and Nutritional Science, Graduate School of Agriculture, Tokyo (Japan); Nakae, Dai [Tokyo University of Agriculture, Laboratory of Protection of Body Function, Department of Food and Nutritional Science, Graduate School of Agriculture, Tokyo (Japan); Tokyo Metropolitan Institute of Public Health, Tokyo (Japan)

    2008-08-15

    Carcinogenic risk and molecular mechanisms underlying the liver tumor-promoting activity of copper gluconate, an additive of functional foods, were investigated using a rat medium-term liver carcinogenicity bioassay protocol (Ito test) and a 2-week short-term administration experiment. In the medium-term liver bioassay, Fischer 344 male rats were given a single i.p. injection of N-nitrosodiethylamine at a dose of 200 mg/kg b.w. as a carcinogenic initiator. Starting 2 weeks thereafter, rats received 0, 10, 300 or 6,000 ppm of copper gluconate in diet for 6 weeks. All rats underwent 2/3 partial hepatectomy at the end of week 3, and all surviving rats were killed at the end of week 8. In the short-term experiment, rats were given 0, 10, 300 or 6,000 ppm of copper gluconate for 2 weeks. Numbers of glutathione S-transferase placental form (GST-P) positive lesions, single GST-P-positive hepatocytes and 8-oxoguanine-positive hepatocytes, and levels of cell proliferation and apoptosis in the liver were significantly increased by 6,000 ppm of copper gluconate in the medium-term liver bioassay. Furthermore, hepatic mRNA expression of genes relating to the metal metabolism, inflammation and apoptosis were elevated by 6,000 ppm of copper gluconate both in the medium-term liver bioassay and the short-term experiments. These results indicate that copper gluconate possesses carcinogenic risk toward the liver at the high dose level, and that oxidative stress and inflammatory and pro-apoptotic signaling statuses may participate in its underlying mechanisms. (orig.)

  19. Expression of tissue inhibitor of matrix metalloproteinases-1 during aging in rat liver

    Institute of Scientific and Technical Information of China (English)

    Yu-Mei Zhang; Xiang-Mei Chen; Di Wu; Suo-Zhu Shi; Zhong Yin; Rui Ding; Yang Lü

    2005-01-01

    AIM: To investigate the expression and role of tissueinhibitor of matrix metalloproteinases-1 (TIMP-1) during natural aging in rat liver and to detect the expression of matrix metalloproteinase-2 (MMP-2) and MMP-9.METHODS: The rats were divided into 3-mo-old group (n = 5), 10-mo-old group (n = 5) and 24-mo-old group(n = 5). Histopathologic changes of liver were observed with HE and Masson stain. The location and protein expressions of TIMP-1 were determined by immunohistochemistry and Westem blot; message RNA (mRNA) levels were measured in livers from rats of various ages by semi-quantitative reverse transcriptional polymerase chain reaction (RT-PCR). In addition, the expression of MMP-2 and MMP-9was assessed by RT-PCR and Western blot.RESULTS: Histologic examination showed that the aging liver had excessive fatty degeneration and collagen deposition. Immunohistochemical staining showed that TIMP-1 related antigen in livers was located in cytoplasm. The proteinexpression of TIMP-1 was significantly higher in the oldestanimals and the mRNA expression was increased significantlyin the 24-mo-old rats (t= 4.61, P= 0.002<0.05, 24-vs 10-mo-old rats; t= 4.31, P= 0.003<0.05, 24- vs 3-mo-oldrats). The expression of MMP-2 and MMP-9 had no change during aging; the ratios TIMP-1/MMP-2 and TIMP-1/MMP-9 in aging liver were significantly higher than those in maturation and young livers.CONCLUSION: TIMP-1 may play an important role in the process of liver aging.

  20. Rat Strain Differences in Susceptibility to Alcohol-Induced Chronic Liver Injury and Hepatic Insulin Resistance

    Directory of Open Access Journals (Sweden)

    Sarah M. DeNucci

    2010-01-01

    Full Text Available The finding of more severe steatohepatitis in alcohol fed Long Evans (LE compared with Sprague Dawley (SD and Fisher 344 (FS rats prompted us to determine whether host factors related to alcohol metabolism, inflammation, and insulin/IGF signaling predict proneness to alcohol-mediated liver injury. Adult FS, SD, and LE rats were fed liquid diets containing 0% or 37% (calories ethanol for 8 weeks. Among controls, LE rats had significantly higher ALT and reduced GAPDH relative to SD and FS rats. Among ethanol-fed rats, despite similar blood alcohol levels, LE rats had more pronounced steatohepatitis and fibrosis, higher levels of ALT, DNA damage, pro-inflammatory cytokines, ADH, ALDH, catalase, GFAP, desmin, and collagen expression, and reduced insulin receptor binding relative to FS rats. Ethanol-exposed SD rats had intermediate degrees of steatohepatitis, increased ALT, ADH and profibrogenesis gene expression, and suppressed insulin receptor binding and GAPDH expression, while pro-inflammatory cytokines were similarly increased as in LE rats. Ethanol feeding in FS rats only reduced IL-6, ALDH1–3, CYP2E1, and GAPDH expression in liver. In conclusion, susceptibility to chronic steatohepatitis may be driven by factors related to efficiency of ethanol metabolism and degree to which ethanol exposure causes hepatic insulin resistance and cytokine activation.

  1. Sipa1l1 is an early biomarker of liver fibrosis in CCl4-treated rats

    Directory of Open Access Journals (Sweden)

    Santiago Marfà

    2016-06-01

    Full Text Available At present, several procedures are used for staging liver fibrosis. However, these methods may involve clinical complications and/or present diagnostic uncertainty mainly in the early stages of the disease. Thus, this study was designed to unveil new non-invasive biomarkers of liver fibrosis in an in vivo model of fibrosis/cirrhosis induction by CCl4 inhalation by using a label-free quantitative LC-MS/MS approach. We analyzed 94 serum samples from adult Wistar rats with different degrees of liver fibrosis and 36 control rats. Firstly, serum samples from 18 CCl4-treated rats were clustered into three different groups according to the severity of hepatic and the serum proteome was characterized by label-free LC-MS/MS. Furthermore, three different pooled serum samples obtained from 16 control Wistar rats were also analyzed. Based on the proteomic data obtained, we performed a multivariate analysis which displayed three main cell signaling pathways altered in fibrosis. In cirrhosis, more biological imbalances were detected as well as multi-organ alterations. In addition, hemopexin and signal-induced proliferation-associated 1 like 1 (SIPA1L1 were selected as potential serum markers of liver fibrogenesis among all the analyzed proteins. The results were validated by ELISA in an independent group of 76 fibrotic/cirrhotic rats and 20 controls which confirmed SIPA1L1 as a potential non-invasive biomarker of liver fibrosis. In particular, SIPA1L1 showed a clear diminution in serum samples from fibrotic/cirrhotic rats and a great accuracy at identifying early fibrotic stages. In conclusion, the proteomic analysis of serum samples from CCl4-treated rats has enabled the identification of SIPA1L1 as a non-invasive marker of early liver fibrosis.

  2. Dose-related effects of dexamethasone on liver damage due to bile duct ligation in rats

    Institute of Scientific and Technical Information of China (English)

    Halil Eken; Hayrettin Ozturk; Hulya Ozturk; Huseyin Buyukbayram

    2006-01-01

    AIM: To evaluate the effects of dexamethasone on liver damage in rats with bile duct ligation. METHODS: A total of 40 male Sprague-Dawley rats,weighing 165-205 g, were used in this study. Group 1 (sham-control, n = 10) rats underwent laparotomy alone and the bile duct was just dissected from the surrounding tissue. Group 2 rats (untreated, n = 10)were subjected to bile duct ligation (BDL) and no drug was applied. Group 3 rats (low-dose dexa, n = 10)received a daily dose of dexamethasone by orogastric tube for 14 d after BDL. Group 4 rats (high-dose dexa,n = 10) received a daily dose of dexamethasone by orogastric tube for 14 d after BDL. At the end of the twoweek period, biochemical and histological evaluations were processed.RESULTS: The mean serum bilirubin and liver enzyme levels significantly decreased, and superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GSHPx) values were significantly increased in low-dose dexa and high-dose dexa groups when compared to the untreated group. The histopathological score was significantly less in the low-dose and high-dose dexa groups compared to the untreated rats. In the low-dose dexa group, moderate liver damage was seen, while mild liver damage was observed in the high-dose dexa group.CONCLUSION: Corticosteroids reduced liver damage produced by bile duct obstruction. However, the histopathological score was not significantly lower in the high-dose corticosteroid group as compared to the lowdose group. Thus, low-dose corticosteroid provides a significant reduction of liver damage without increased side effects, while high dose is associated not with lower fibrosis but with increased side effects.

  3. Regeneration and Cell Recruitment in an Improved Heterotopic Auxiliary Partial Liver Transplantation Model in the Rat.

    Science.gov (United States)

    Ono, Yoshihiro; Pérez-Gutiérrez, Angelica; Yovchev, Mladen I; Matsubara, Kentaro; Yokota, Shinichiro; Guzman-Lepe, Jorge; Handa, Kan; Collin de l'Hortet, Alexandra; Thomson, Angus W; Geller, David A; Yagi, Hiroshi; Oertel, Michael; Soto-Gutierrez, Alejandro

    2017-01-01

    Auxiliary partial liver transplantation (APLT) in humans is a therapeutic modality used especially to treat liver failure in children or congenital metabolic disease. Animal models of APLT have helped to explore therapeutic options. Though many groups have suggested improvements, standardizing the surgical procedure has been challenging. Additionally, the question of whether graft livers are reconstituted by recipient-derived cells after transplantation has been controversial. The aim of this study was to improve experimental APLT in rats and to assess cell recruitment in the liver grafts. To inhibit recipient liver regeneration and to promote graft regeneration, we treated recipients with retrorsine and added arterial anastomosis. Using green fluorescence protein transgenic rats as recipients, we examined liver resident cell recruitment within graft livers by immunofluorescence costaining. In the improved APLT model, we achieved well-regenerated grafts that could maintain regeneration for at least 4 weeks. Regarding the cell recruitment, there was no evidence of recipient-derived hepatocyte, cholangiocyte, or hepatic stellate cell recruitment into the graft. Macrophages/monocytes, however, were consistently recruited into the graft and increased over time, which might be related to inflammatory responses. Very few endothelial cells showed colocalization of markers. We have successfully established an improved rat APLT model with arterial anastomosis as a standard technique. Using this model, we have characterized cell recruitment into the regenerating grafts.

  4. Methanobactin reverses acute liver failure in a rat model of Wilson disease

    Science.gov (United States)

    Lichtmannegger, Josef; Leitzinger, Christin; Wimmer, Ralf; Schmitt, Sabine; Schulz, Sabine; Eberhagen, Carola; Rieder, Tamara; Janik, Dirk; Neff, Frauke; Straub, Beate K.; Schirmacher, Peter; DiSpirito, Alan A.; Bandow, Nathan; Baral, Bipin S.; Flatley, Andrew; Kremmer, Elisabeth; Denk, Gerald; Reiter, Florian P.; Hohenester, Simon; Eckardt-Schupp, Friedericke; Dencher, Norbert A.; Sauer, Vanessa; Niemietz, Christoph; Schmidt, Hartmut H.J.; Merle, Uta; Gotthardt, Daniel Nils; Kroemer, Guido; Weiss, Karl Heinz

    2016-01-01

    In Wilson disease (WD), functional loss of ATPase copper-transporting β (ATP7B) impairs biliary copper excretion, leading to excessive copper accumulation in the liver and fulminant hepatitis. Current US Food and Drug Administration– and European Medicines Agency–approved pharmacological treatments usually fail to restore copper homeostasis in patients with WD who have progressed to acute liver failure, leaving liver transplantation as the only viable treatment option. Here, we investigated the therapeutic utility of methanobactin (MB), a peptide produced by Methylosinus trichosporium OB3b, which has an exceptionally high affinity for copper. We demonstrated that ATP7B-deficient rats recapitulate WD-associated phenotypes, including hepatic copper accumulation, liver damage, and mitochondrial impairment. Short-term treatment of these rats with MB efficiently reversed mitochondrial impairment and liver damage in the acute stages of liver copper accumulation compared with that seen in untreated ATP7B-deficient rats. This beneficial effect was associated with depletion of copper from hepatocyte mitochondria. Moreover, MB treatment prevented hepatocyte death, subsequent liver failure, and death in the rodent model. These results suggest that MB has potential as a therapeutic agent for the treatment of acute WD. PMID:27322060

  5. The protection of meloxicam against chronic aluminium overload-induced liver injury in rats.

    Science.gov (United States)

    Yang, Yang; He, Qin; Wang, Hong; Hu, Xinyue; Luo, Ying; Liang, Guojuan; Kuang, Shengnan; Mai, Shaoshan; Ma, Jie; Tian, Xiaoyan; Chen, Qi; Yang, Junqing

    2017-04-04

    The present study was designed to observe the protective effect and mechanisms of meloxicam on liver injury caused by chronic aluminium exposure in rats. The histopathology was detected by hematoxylin-eosin staining. The levels of prostaglandin E2, cyclic adenosine monophosphate and inflammatory cytokines were detected by enzyme linked immunosorbent assay. The expressions of cyclooxygenases-2, prostaglandin E2 receptors and protein kinase A were measured by western blotting and immunohistochemistry. Our experimental results showed that aluminium overload significantly damaged the liver. Aluminium also significantly increased the expressions of cyclooxygenases-2, prostaglandin E2, cyclic adenosine monophosphate, protein kinase A and the prostaglandin E2 receptors (EP1,2,4) and the levels of inflammation and oxidative stress, while significantly decreased the EP3 expression in liver. The administration of meloxicam significantly improved the impairment of liver. The contents of prostaglandin E2 and cyclic adenosine monophosphate were significantly decreased by administration of meloxicam. The administration of meloxicam also significantly decreased the expressions of cyclooxygenases-2 and protein kinase A and the levels of inflammation and oxidative stress, while significantly increased the EP1,2,3,4 expressions in rat liver. Our results suggested that the imbalance of cyclooxygenases-2 and downstream prostaglandin E2 signaling pathway is involved in the injury of chronic aluminium-overload rat liver. The protective mechanism of meloxicam on aluminium-overload liver injury is attributed to reconstruct the balance of cyclooxygenases-2 and downstream prostaglandin E2 signaling pathway.

  6. Butylbenzyl phthalate hydrolysis in liver microsomes of humans, monkeys, dogs, rats and mice.

    Science.gov (United States)

    Takahara, Yuka; Kinashi, Yu; Takahara, Yuusuke; Hichiya, Hiroyuki; Okada, Kenji; Murata, Mikio; Shigeyama, Masato; Hanioka, Nobumitsu

    2014-01-01

    Butylbenzyl phthalate (BBzP) is used as a plasticizer to import flexibility to polyvinylchloride plastics. In this study, hydrolysis of BBzP to monobutyl phthalate (MBP) and monobenzyl phthalate (MBzP) in liver microsomes of humans, monkeys, dogs, rats and mice was examined. The kinetics for MBP formation by human, dog and mouse liver microsomes followed the Michaelis-Menten model, whereas the kinetics by monkey and rat liver microsomes fitted the Hill model. The kinetics for MBzP formation fitted the Hill model for all liver microsomes. The Vmax and in vitro clearance (CLint or CLmax) ratios of MBP/MBzP formation varied among animal species, although the Km for MBP and MBzP formation in each liver microsomes were generally comparable. The hydrolysis of BBzP to monoester phthalates in mammalian liver microsomes could be classified into two types: MBzP>MBP type for humans and dogs, and MBP>MBzP type for monkeys, rats and mice. These findings suggest that the formation profile of MBzP and MBP from BBzP by liver microsomes differs extensively among animal species.

  7. Effect of Gadolinium Chloride on Liver Regeneration Following Thioacetamide-Induced Necrosis in Rats

    Directory of Open Access Journals (Sweden)

    María Isabel Sánchez-Reus

    2010-11-01

    Full Text Available Gadolinium chloride (GD attenuates drug-induced hepatotoxicity by selectively inactivating Kupffer cells. The effect of GD was studied in reference to postnecrotic liver regeneration induced in rats by thioacetamide (TA. Rats, intravenously pretreated with a single dose of GD (0.1 mmol/Kg, were intraperitoneally injected with TA (6.6 mmol/Kg. Hepatocytes were isolated from rats at 0, 12, 24, 48, 72 and 96 h following TA intoxication, and samples of blood and liver were obtained. Parameters related to liver damage were determined in blood. In order to evaluate the mechanisms involved in the post-necrotic regenerative state, the time course of DNA distribution and ploidy were assayed in isolated hepatocytes. The levels of circulating cytokine TNFα was assayed in serum samples. TNFα was also determined by RT-PCR in liver extracts. The results showed that GD significantly reduced the extent of necrosis. The effect of GD induced noticeable changes in the post-necrotic regeneration, causing an increased percentage of hepatocytes in S phase of the cell cycle. Hepatocytes increased their proliferation as a result of these changes. TNFα expression and serum level were diminished in rats pretreated with GD. Thus, GD pre-treatment reduced TA-induced liver injury and accelerated postnecrotic liver regeneration. No evidence of TNFα implication in this enhancement of hepatocyte proliferation and liver regeneration was found. These results demonstrate that Kupffer cells are involved in TA-induced liver damage, as well as and also in the postnecrotic proliferative liver states.

  8. Studies on responsiveness of hepatoma cells to catecholamines. II. Comparison of beta-adrenergic responsiveness of rat ascites hepatoma cells with cultured normal rat liver cells.

    Science.gov (United States)

    Miyamoto, K; Matsunaga, T; Takemoto, N; Sanae, F; Koshiura, R

    1985-05-01

    The pharmacological properties of beta-adrenoceptors in rat ascites hepatoma cells were compared with those in normal rat liver cells which were cultured for 24 hr after collagenase digestion. Adenylate cyclases in the homogenates of cultured normal rat liver cells and rat ascites hepatoma cells, AH44, AH66, AH109A, AH130 and AH7974, were all activated by isoproterenol or NaF to different degrees. The enzyme in rat liver cells was activated by several beta 2-agonists but those in all hepatoma cells hardly responded. Furthermore, salbutamol, a beta 2-partial agonist, antagonized the cyclase activation by isoproterenol in AH130 cells. The Kact value of isoproterenol for the activation of adenylate cyclase in AH130 cells was smaller than that in rat liver cells. A comparison of the Ki values of beta-antagonists for the inhibition of isoproterenol-stimulated cyclase activity shows that while the Ki values of propranolol and butoxamine in AH130 cells were similar to those in rat liver cells, a significant difference was observed in the values for beta 1-selective antagonists between AH130 cells and rat liver cells. The Ki values of metoprolol and atenolol for AH130 cells were 137- and 90-fold lower, respectively, than for normal rat liver cells. From these findings, it is strongly suggested that beta-adrenoceptors in rat ascites hepatoma cells including AH130 cells have similar properties to the mammalian beta 1-receptor.

  9. The Preotective effects of Okra Powder (Abelmoschus esculentus on Histological and Histochemical Changes of Pancreatic Beta Cells and Liver Tissue of Diabetic Rat

    Directory of Open Access Journals (Sweden)

    Naeim Erfani Majd

    2017-04-01

    Full Text Available Background and Objective: Since Abelmoschus esculentus plant has many medical benefits, the present study aimed to investigate the therapeutic effects of Okra Powder (Abelmoschus esculentus against high-fat diet fed-streptozotocin (HFD/STZ-induced diabetic rats. Methods: In this experimental study, 25 Wistar Albino female rats were randomly divided into 5 groups: I: control group; II: healthy rats receiving A. esculentus (200 mg/kg; III (HFD/STZ group: Rats fed with high-fat diet (HFD (60% fat for 4 weeks and then injected low-dose STZ (35 mg/kg; IV: diabetic rats receiving A. esculentus (200mg/kg and V: diabetic rats receiving metformin (200 mg/kg. At the end of experiment, biochemical parameters, including Fasting Blood Glucose (FBG, insulin levels, Homa-IR index, ALT, AST and lipid profile were measured. Pancreas and Liver samples were removed, and 5-6 µ sections were prepared and stained by H&E and aldehyde fuchsin staining. Results: All the biochemical parameters, except HDL-C and insulin, were increased in diabetic rats, while these parameters were decreased in Okra supplementation group compared to diabetic rats (p<0.05. Furthermore, Okra improved the histological impairments of pancreas and liver, including vacuolization, and decrease of β-cells as well as hypertrophy and vacuolization of hepatocytes in diabetic rats. Conclusion: Okra powder improved biochemical parameters, liver structure and restoration of beta cells of pancreas in diabetic rats. Thus, it can be considered a complementary therapy to improve diabetic patients.

  10. Metabolism of 4'-(9-acridinylamino)methanesulfon-m-anisidide by rat liver microsomes

    Energy Technology Data Exchange (ETDEWEB)

    Shoemaker, D.D.; Cysyk, R.L.; Gormley, P.E.; DeSouza, J.J.; Malspeis, L.

    1984-05-01

    4'-(9-Acridinylamino)methanesulfon-m-anisidide (m-AMSA) is metabolized by a hepatic microsomal enzyme system composed of rat liver microsomes, a reduced nicotinamide adenine dinucleotide phosphate-generating system, cytosolic protein (or glutathione), and oxygen. Omission of any one of the components, or incubation under an atmosphere of CO or N/sub 2/, results in inhibition of the reaction. Also, the addition of inhibitors of microsomal metabolism (alpha-naphthoflavone, metyrapone, or SKF 525-A) decreases m-AMSA metabolism. Metabolism of m-AMSA is more rapid with microsomes prepared from rats pretreated with phenobarbital or 3-methylcholanthrene. Two microsomal oxidation products of m-AMSA were isolated and identified as N1'-methanesulfonyl-N4'-(9-acridinyl)-3'-methoxy-2',5'-cyclohex adiene-1', 4'-dimine (m-AQDI) and 3'-methoxy-4'-(9-acridinylamino-2',5'-cyclohexadien-1'-one (m-AQI). m-AQDI reacts with glutathione to form a product previously identified in in vivo studies as the principal rat biliary metabolite and which is not cytotoxic to cultured L1210 cells. Thus, the end result of the microsomal metabolism of m-AMSA is detoxification. However, the two primary oxidation products (m-AQDI and m-AQI) are considerably more cytotoxic to L1210 cells in vitro than is m-AMSA. The concentration of m-AMSA required to produce a 5-log kill is 1.0 microgram/ml compared to 0.01 microgram/ml for m-AQDI and m-AQI. These results indicate that m-AMSA might undergo bioactivation to form the active cytotoxic species of the drug.

  11. Nonalcoholic fatty liver disease progression in rats is accelerated by splenic regulation of liver PTEN/AKT

    Directory of Open Access Journals (Sweden)

    Ziming Wang

    2015-01-01

    Full Text Available Background/Aim: The spleen has been reported to participate in the development of nonalcoholic fatty liver disease (NAFLD, but the mechanism has not been fully characterized. This study aims to elucidate how the spleen affects the development of NAFLD in a rat model. Materials and Methods: Following either splenectomy or sham operation, male Sprague–Dawley (SD rats were fed a high-fat diet to drive the development of NAFLD; animals fed a normal diet were used as controls. Two months after surgery, livers and blood samples were collected. Serum lipids were measured; liver histology, phosphatase and tensin homologue deleted on chromosome 10 (PTEN gene expression, and the ratio of pAkt/Akt were determined. Results: Splenectomy increased serum lipids, except triglyceride (TG and high-density lipoprotein (HDL, in animals fed either a high-fat or normal diet. Furthermore, splenectomy significantly accelerated hepatic steatosis. Western blot analysis and real-time polymerase chain reaction showed splenectomy induced significant downregulation of PTEN expression and a high ratio of pAkt/Akt in the livers. Conclusions: The spleen appears to play a role in the development of NAFLD, via a mechanism involving downregulation of hepatic PTEN expression.

  12. Chronic Arsenic Exposure-Induced Oxidative Stress is Mediated by Decreased Mitochondrial Biogenesis in Rat Liver.

    Science.gov (United States)

    Prakash, Chandra; Kumar, Vijay

    2016-09-01

    The present study was executed to study the effect of chronic arsenic exposure on generation of mitochondrial oxidative stress and biogenesis in rat liver. Chronic sodium arsenite treatment (25 ppm for 12 weeks) decreased mitochondrial complexes activity in rat liver. There was a decrease in mitochondrial superoxide dismutase (MnSOD) activity in arsenic-treated rats that might be responsible for increased protein and lipid oxidation as observed in our study. The messenger RNA (mRNA) expression of mitochondrial and nuclear-encoded subunits of complexes I (ND1 and ND2) and IV (COX I and COX IV) was downregulated in arsenic-treated rats only. The protein and mRNA expression of MnSOD was reduced suggesting increased mitochondrial oxidative damage after arsenic treatment. There was activation of Bax and caspase-3 followed by release of cytochrome c from mitochondria suggesting induction of apoptotic pathway under oxidative stress. The entire phenomenon was associated with decrease in mitochondrial biogenesis as evident by decreased protein and mRNA expression of nuclear respiratory factor 1 (NRF-1), nuclear respiratory factor 2 (NRF-2), peroxisome proliferator activator receptor gamma-coactivator 1α (PGC-1α), and mitochondrial transcription factor A (Tfam) in arsenic-treated rat liver. The results of the present study indicate that arsenic-induced mitochondrial oxidative stress is associated with decreased mitochondrial biogenesis in rat liver that may present one of the mechanisms for arsenic-induced hepatotoxicity.

  13. Transcription Profiles of Marker Genes Predict The Transdifferentiation Relationship between Eight Types of Liver Cell during Rat Liver Regeneration

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    Xiaguang Chen

    2015-07-01

    Full Text Available Objective: To investigate the transdifferentiation relationship between eight types of liver cell during rat liver regeneration (LR. Materials and Methods: 114 healthy Sprague-Dawley (SD rats were used in this experimental study. Eight types of liver cell were isolated and purified with percoll density gradient centrifugation and immunomagentic bead methods. Marker genes for eight types of cell were obtained by retrieving the relevant references and databases. Expression changes of markers for each cell of the eight cell types were measured using microarray. The relationships between the expression profiles of marker genes and transdifferentiation among liver cells were analyzed using bioinformatics. Liver cell transdifferentiation was predicted by comparing expression profiles of marker genes in different liver cells. Results: During LR hepatocytes (HCs not only express hepatic oval cells (HOC markers (including PROM1, KRT14 and LY6E, but also express biliary epithelial cell (BEC markers (including KRT7 and KRT19; BECs express both HOC markers (including GABRP, PCNA and THY1 and HC markers such as CPS1, TAT, KRT8 and KRT18; both HC markers (KRT18, KRT8 and WT1 and BEC markers (KRT7 and KRT19 were detected in HOCs. Additionally, some HC markers were also significantly upregulated in hepatic stellate cells ( HSCs, sinusoidal endothelial cells (SECs , Kupffer cells (KCs and dendritic cells (DCs, mainly at 6-72 hours post partial hepatectomy (PH. Conclusion: Our findings indicate that there is a mutual transdifferentiation relationship between HC, BEC and HOC during LR, and a tendency for HSCs, SECs, KCs and DCs to transdifferentiate into HCs.

  14. Immunochemical visualization and identification of rat liver proteins adducted by 2,6-di-tert-butyl-4-methylphenol (BHT).

    Science.gov (United States)

    Reed, M; Thompson, D C

    1997-10-01

    Several alkylphenols (e.g., 2,6-di-tert-butyl-4-methylphenol, BHT) form reactive quinone methide intermediates (e.g., 2,6-di-tert-butyl-4-methylene-2,5-cyclohexadienone, BHT-QM) upon oxidation by cellular enzymes. In order to pursue the role of protein alkylation in alkylphenol toxicity, we used an immunochemical approach to identify protein targets alkylated by BHT. Synthetic BHT-N-acetylcysteine (BHT-NAC) was coupled to keyhole limpet hemocyanin and used as an antigen from which polyclonal antibodies were raised in New Zealand white rabbits. Rabbit serum contained an antibody which was highly specific for BHT-NAC, as determined by competitive ELISA. The BHT antibody was used as a probe to look for the presence of BHT-protein adducts in in vitro incubations with rat liver microsomes or tissue slices and also in vivo in liver tissue from male Sprague-Dawley rats exposed to BHT. Western blotting of protein gels revealed BHT-dependent protein alkylation over a wide molecular weight range. Prominent recurrent bands were observed at approximately 34.5, 52, 64.5, 74, and 97 kDa. Detection of adducts was inhibited in microsomal incubations by cytochrome P450 inhibitors, deuterated BHT, and the omission of NADPH. Similar protein alkylation patterns were observed in rat liver microsomes exposed to synthetically prepared BHT-QM as in the enzyme-mediated incubations. In rats gavaged with up to 1000 mg/kg BHT, the amount of protein alkylation observed was maximal at 24 h postdosing and was dose-dependent. Two alkylated proteins were isolated and identified by N-terminal sequencing: a mitochondrial beta-oxidation enzyme, enoyl-CoA hydratase, and a plasma membrane/cytoskeletal linker protein from the ezrin/moesin/radixin family.

  15. The involvement of intracellular calcium ion concentration and calmodulin in the 25-hydroxylation of cholecalciferol in ovine and rat liver.

    Science.gov (United States)

    Corlett, S C; Chaudhary, M S; Tomlinson, S; Care, A D

    1987-08-01

    The effect of Ca2+ ion concentration on the 25 hydroxylation of tritiated cholecalciferol (3HD3) was investigated using homogenates of ovine liver from vitamin D replete sheep. A significant decrease in the production of 25 hydroxycholecalciferol (25OHD3) was observed when the concentration of Ca2+ in the homogenate was raised above 0.68 mmol/l by the addition of calcium gluconate. Similarly, a final concentration of 37 mumol EGTA/1 (equivalent to a Ca2+ concentration of 26.5 nmol/l) was associated with a 50% reduction of 25OHD3 production. That is, a broad bell-shaped relationship was observed between the production of 25OHD3 and the Ca2+ concentration in the homogenate. These changes in the rate of production of 25OHD3 were reproduced with hepatocytes from vitamin D replete rats, prepared by collagenase perfusion, using the drugs dantrolene sodium (DaNa) to reduce (ED50 = 57 mmol/l) and veratridine to increase (ED50 = 550 mmol/l) the intracellular Ca2+ concentration. Hepatocytes from vitamin D replete rats also showed a reduction in 25 hydroxylation of D3 (ED50 = 6 ng/ml) in response to the addition of 1-25 dihydroxycholecalciferol (1-25 (OH)2D3). The calmodulin antagonists; W7, compound 48/80, trifluoperazine (TFP) and calmidazolium (R24571) were all found to effect a dose response inhibition of the 25 hydroxylation of cholecalciferol by homogenates of ovine liver. R24571 had a similar inhibitory effect (ED50 = 70 mumol/l) upon the 25 hydroxylase enzyme of rat hepatocytes. It is concluded that the 25 hydroxylation of cholecalciferol in liver of vitamin D replete rats and sheep is calcium sensitive and is reduced in the presence of increased concentrations of 1,25(OH)2D3. Calmodulin may also be involved in the regulation of hepatocyte 25-hydroxylase activity by Ca2+.

  16. The Investigation of the Antioxidative Properties of the Synthetic Organoselenium Compounds in Liver Tissue of Rat with Histological and Biochemical Analyses

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    Zeliha Selamoglu

    2015-10-01

    Full Text Available  Background: Oxidative stress is described as the formation of toxic effect due to the deficiency of cellular antioxidative level toward the level of reactive oxygen species (ROS. The excess production of ROS or the decrease in the antioxidative defense system could be the cause for oxidative stress. 7,12-dimethylbenz[a]anthracene (DMBA that is known to be the major cause the increment in lipid peroxidation level and the oxidative damage in the rat liver. As a fundamental trace elements, selenium as a part of anti-oxidative defense system is responsible for the immune system as part of enzymes in defense system.  Methods:Organoselenium compounds [1-isopropyl-3- methylbenzimidazole-2-selenone (Se I and 1, 3-di-pmethoxybenzylpyrimidine- 2-selenone (Se II] that were prepared in the laboratories. The effects of synthetic organoselenium compounds (Se I and Se II against DMBA-induced changes in levels of some [catalase (CAT, superoxide dismutase (SOD, glutathione peroxidase (GPx, and glutathione reductase (GR activities and total glutathione (GSH, malonedialdehyde (MDA] parameters in rat liver were investigated. Histopathological changes in the liver tissues of rats were examined by light microscopy. Results:Because the selenium has an anti-oxidative properties toward the damaged induced cells, organoselenium compounds prepared in our laboratories, Se I and Se II, have tested for chemically induced rat liver tissues. The results showed that endogen antioxidant enzymatic activities changes and the preventing of oxidative damage in lipid peroxidation are important findings in vivo of this research. Conclusion:Various changes were observed in liver tissue of rats in the all experimental groups.

  17. Hepatoprotective effects of Quercus infectoria gall extract against carbon tetrachloride treated liver injury in rats

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    Gaurav Lodhi

    2012-08-01

    Full Text Available Summary. In the present study, galls of Quercus infectoria possessing potent antioxidant and antiinflammatory properties were evaluated for their hepatoprotective effect against carbon tetrachloride (CCl4 induced hepatotoxicity in rats. Subcutaneous injection of CCl4, administered twice a week, produced a marked elevation in the serum levels of aspartate transaminase (AST, alanine transaminase (ALT and tumor necrosis factor alpha (TNF-α. Histological analysis of the liver of these rats revealed marked necro-inflammatory changes that were associated with increase in the levels of TBARS, PGE2 and catalase and decrease in the levels of glutathione (GSH, superoxide dismutase (SOD and glutathione peroxidase (GPx. Daily oral administration of aqueous ethanolic extract of Quercus infectoria galls at 200, 400 and 600 mg/kg doses produced a dose dependent reduction in the serum levels of liver enzymes and inflammatory mediators and attenuated the necroinflammatory changes in the liver. The QIE treatment also normalized various biochemical parameters of oxidative stress. Our study shows that the hepatoprotective effects of QIE and silymarin were comparable and suggests that QIE could be used as a hepatoprotective agent. Industrial relevance. Research in traditional medicine has lead to the development of many modern medicines. In recent times, focus on plants research has increased all over the world and a large body of evidence has been collected to show immense potential of medicinal plants used in various traditional systems. It is very interesting to note that there is no drug available in the modern system of medicine for treating hepatic disorders; only certain herbal preparations are available to treat this quite vulnerable disease. The situation/background thus explained above warrants for developing a safe, effective and scientifically validated hepatoprotective agent taking lead from traditional medicine, which is affordable for the rural poor

  18. [Cyclosporin, toxicity and efficacy in rejection of liver allografts in the rat].

    Science.gov (United States)

    Settaf, A; Gugenheim, J; Lahlou, M K; Gigou, M; Capron-Laudereau, M; Charpentier, B; Reynes, M; Lokiec, F; Bismuth, H

    1989-01-01

    52 orthotopic liver transplants were performed in DA to lewis rat strain combination, in order to appreciate cyclosporine toxicity, and efficacy at doses of 10 mg/kg day (G II) and 20 mg/kg/day (GIII) compared to liver allografts in DA/lewis rats. The first signs of cyclosporine hepatotoxicity are biological (increased plasma level of bilirubine and transaminase) that were noticed at the dose of 20 mg/kg/day. Histological signs (cells inclusion, hepatocytic necrosis) appeared late and were less constant as well as difficult to assert creatinine plasma level was the best reflect of cyclosporine nephrotoxicity. Renal toxicity was practically constant at the dose of 20 mg/kg/day. In spite of renal and hepatic toxicity, cyclosporin by itself, allows the abolition of the acute rejection of liver allografts in the rat.

  19. Molecular mechanism of null expression of aldehyde dehydrogenase-1 in rat liver

    Energy Technology Data Exchange (ETDEWEB)

    Chen, J.; Yoshida, Akira [Institute of the City of Hope, Duarte, CA (United States); Yanagawa, Yuchio [Tokohu Univ., Sendai (Japan)

    1996-04-01

    In isozyme systems in general, the pattern of tissue-dependent expression of a given type of isozyme is uniform in various mammalian species. In contrast, a major cytosolic aldehyde dehydrogenase isozyme, termed ALDH1, which is strongly expressed in the livers of humans and other mammals, is hardly detectable in rat liver. Thirteen nucleotides existing in the 5{prime}-promoter region of human, marmoset, and mouse ALDH1 genes are absent in the four rat strains examined. When the 13 nucleotides were deleted from a chloramphenicol acetyltransferase expression construct, which contained the 5{prime} promoter region of the human ALDH1 gene and a low-background promoterless chloramphenicol acetyltransferase expression vector, the expression activity was severely diminished in human hepatic cells. Thus, deletion of the 13 nucleotides in the promoter region of the gene can account for the lack of ALDH1 expression in rat liver. 16 refs., 3 figs.

  20. Mercury-selenium interactions in relation to histochemical staining of mercury in the rat liver

    DEFF Research Database (Denmark)

    Baatrup, E; Thorlacius-Ussing, O; Nielsen, H L

    1989-01-01

    of the radioactively labelled Hg compounds showed that the chemical form of mercury, either organic or inorganic, was preserved from its administration to its deposition in the liver. Light and electron microscopy demonstrated that no silver enhancement of Hg occurred when MeHg alone was present in the sections......Selenium has been suggested to enhance the histochemical staining of mercury when sections of tissue are subjected to the silver-enhancement method. In the present study, histochemical staining patterns of mercury in tissue sections of rat livers were compared with the actual content of organic...... and inorganic Hg in the livers, in both the presence and the absence of Se. Rats were injected intravenously with 5 micrograms of Hg g-1 body weight as methyl [203Hg] mercury chloride (MeHg) or as [203Hg]mercuric chloride (Hg2+). After 2 h, half the rats received an additional intraperitoneal injection of 2...

  1. Study on Biological Effects of La(3+) on Rat Liver Mitochondria by Microcalorimetric and Spectroscopic Methods.

    Science.gov (United States)

    Wu, Man; Gao, Jia-Ling; Feng, Zhi-Jiang; Liu, Wen; Zhang, Ye-Zhong; Liu, Yi; Dai, Jie

    2015-09-01

    The effects of lanthanum on heat production of mitochondria isolated from Wistar rat liver were investigated with microcalorimetry; simultaneously, the effects on mitochondrial swelling and membrane potential (Δψ) were determined by spectroscopic methods. La(3+) showed only inhibitory action on mitochondrial energy turnover with IC50 being 55.8 μmol L(-1). In the spectroscopic experiments, La(3+), like Ca(2+), induced rat liver mitochondrial swelling and decreased membrane potential (Δψ), which was inhibited by the specific permeability transition inhibitor, cyclosporine A (CsA). The induction ability of La(3+) was stronger than that of Ca(2+). These results demonstrated that La(3+) had some biotoxicity effect on mitochondria; the effects of La(3+) and Ca(2+) on rat liver mitochondrial membrane permeability transition (MPT) are different, and La represents toxic action rather than Ca analogy.

  2. Discovery of sphingosine 1-O-methyltransferase in rat kidney and liver homogenates

    Institute of Scientific and Technical Information of China (English)

    Santosh J SACKET; Dong-soon IM

    2008-01-01

    Aim:To characterize sphingosine methyltransferase in rat tissues.Methods:By using S-adenosyl-L-(methyl-3H) methionine,enzymatic activity was measured in the rat liver and kidney homogenates.Results:The optimum pH and reaction time for the enzyme assay were pH 7.8 and 1 h.ZnCl2 inhibited the activity,but not MgCl2,CaCl2,CoCl2,or NiCl2.In the kidney homogenate,enzymatic activity was detectable in the cytosol and all membrane fractions from the plasma membrane and other organelles; however,in the liver homogenate,enzymatic activity was detectable in all membrane fractions,but not in the cytosol.We also tested the enzymatic activity with structurally-modified sphingosine derivatives.Conclusion:We found sphingosine l-O-methyltransferase activity in the rat liver and kidney homogenates.

  3. High-performance liquid chromatographic assay detects pentamidine metabolism by Fisher rat liver microsomes.

    Science.gov (United States)

    Tuttle, R H; Hall, J E; Tidwell, R R

    1997-01-24

    Fisher rat liver microsomes metabolized the antimicrobial drug pentamidine to four new compounds detected by gradient elution reversed-phase high-performance liquid chromatography with variable wavelength detection. Coelution experiments with pentamidine metabolite standards determined the new peaks to be previously identified hydroxylated metabolites of pentamidine, with 1,5-bis(4'-amidinophenoxy)-3-pentanol and 1,5-di-(4'-amidinophenoxy)-2-pentanol formed in the greatest amount. The data contradict a previous report that Fisher rat liver homogenates do not metabolize pentamidine. Pentamidine and its known primary metabolites have almost identical absorption spectra; thus, pentamidine metabolism must be evaluated using gradient elution HPLC to resolve pentamidine from its metabolites. The current assay has now been used to demonstrate that Fisher and Sprague-Dawley rat, mouse, rabbit and human liver microsomes all metabolize pentamidine in vitro.

  4. H sup + -ATP synthase from rat liver mitochondria. A simple, rapid purification method of the functional complex and its characterization

    Energy Technology Data Exchange (ETDEWEB)

    Yoshihara, Yutaka; Nagase, Hideki; Yamane, Takeshi; Oka, Hideki; Tani, Isamu; Higuti, Tomihiko (Univ. of Tokushima (Japan))

    1991-07-16

    A novel, simple, and rapid preparative method for purification of rat liver H{sup +}-ATP synthase by anion-exchange HPLC was developed. The H{sup +}-ATP synthase purified had higher ATPase activity in the absence of added phospholipids than any preparation reported previously, and this activity was completely inhibited by oligomycin. When reconstituted into proteoliposomes, the H{sup +}-ATP synthase showed an ATP-dependent 8-anilinonaphthalene-1-sulfonate response and ATP-P{sub i} exchange activity, both of which were also completely inhibited by oligomycin and an uncoupler, indicating the intactness of the H{sup +}-ATP synthase. An immunochemical study and a labeling experiment with N,N{prime}-({sup 14}C)dicyclohexylcarbondiimide (({sup 14}C)DCCD) demonstrated the presence of chargerin II (a product of mitochondrial A6L DNA) and DCCD-binding protein (subunit c) in the complex. The subunits of the complex were separated into 11 main fractions by reverse-phase HPLC, and 3 of them and the {sigma} subunit in F{sub 1} were partially sequenced. A search for sequence homologies indicated that these components were subunit b, coupling factor 6, subunit {sigma}, and subunit e. This is the first report of the existence of subunit b, factor 6, and chargerin II in K{sup +}-ATP synthase purified from rat liver mitochondria.

  5. Can Chronic Nitric Oxide Inhibition Improve Liver and Renal Dysfunction in Bile Duct Ligated Rats?

    Directory of Open Access Journals (Sweden)

    Mona Fouad Mahmoud

    2015-01-01

    Full Text Available The aims of the present work were to study the effects of chronic NO inhibition on liver cirrhosis and to analyze its relationship with liver and kidney damage markers. Two inhibitors of NO synthesis (inducible NO synthase (iNOS inhibitor, aminoguanidine (AG, and nonselective NOS inhibitor, L-nitroarginine methyl ester (L-NAME were administered for 6 weeks to bile duct ligated (BDL rats 3 days after surgery. The present study showed that BDL was associated with liver injury and renal impairment. BDL increased liver NO content and myeloperoxidase (MPO activity. This was corroborated by increased oxidative stress, TNF-α, TGF-1β, and MMP-13 genes overexpression. Although both drugs reduced NO synthesis and TNF-α gene overexpression, only AG improved renal dysfunction and liver damage and reduced liver oxidative stress. However, L-NAME exacerbated liver and renal dysfunction. Both drugs failed to modulate TGF-1β and MMP-13 genes overexpression. In conclusion, inhibition of NO production by constitutive nitric oxide synthase (cNOS plays a crucial role in liver injury and renal dysfunction while inhibition of iNOS by AG has beneficial effect. TNF-α is not the main cytokine responsible for liver injury in BDL model. Nitric oxide inhibition did not stop the progression of cholestatic liver damage.

  6. Characterization of triptolide hydroxylation by cytochrome P450 in human and rat liver microsomes.

    Science.gov (United States)

    Li, W; Liu, Y; He, Y-Q; Zhang, J-W; Gao, Y; Ge, G-B; Liu, H-X; Huo, H; Liu, H-T; Wang, L-M; Sun, J; Wang, Q; Yang, L

    2008-12-01

    Triptolide, the primary active component of a traditional Chinese medicine Tripterygium wilfordii Hook F, has a wide range of pharmacological activities. In the present study, the metabolism of triptolide by cytochrome P450s was investigated in human and rat liver microsomes. Triptolide was converted to four metabolites (M-1, M-2, M-3, and M-4) in rat liver microsomes and three (M-2, M-3, and M-4) in human liver microsomes. All the products were identified as mono-hydroxylated triptolides by liquid chromatography-mass spectrometry (LC-MS). The studies with chemical selective inhibitors, complementary DNA-expressed human cytochrome P450s, correlation analysis, and enzyme kinetics were also conducted. The results demonstrate that CYP3A4 and CYP2C19 could be involved in the metabolism of triptolide in human liver, and that CYP3A4 was the primary isoform responsible for its hydroxylation.

  7. Effect of Tridax procumbens (Linn.) on bile duct ligation-induced liver fibrosis in rats.

    Science.gov (United States)

    Joshi, P P; Patil, S D; Silawat, N; Deshmukh, P T

    2011-12-01

    The present study was undertaken to clarify whether methanolic extract of Tridax procumbens prevents liver fibrosis in rat. The hepatic fibrosis was induced by 28 days of bile duct ligation in rats. The 4-week treatment with Tridex procumbens reduced the serum aspartate aminotransferase (U L⁻¹), glutamate pyruvate transaminase (U L⁻¹), alkaline phosphatase (IU L⁻¹), lactate dehydrogenase (IU L⁻¹), total bilirubin (mg dL⁻¹), direct bilirubin (mg dL⁻¹) and hydroxyproline (mg gm⁻¹) content in liver and improved the histological appearance of liver section. The results of this study led us to conclude that T. procumbens can reduce the degree of hepatocellular damage and may become antifibrotic agent for liver fibrosis.

  8. Energetic, oxidative and ionic exchange in rat brain and liver mitochondria at experimental audiogenic epilepsy (Krushinsky-Molodkina model).

    Science.gov (United States)

    Venediktova, Natalya I; Gorbacheva, Olga S; Belosludtseva, Natalia V; Fedotova, Irina B; Surina, Natalia M; Poletaeva, Inga I; Kolomytkin, Oleg V; Mironova, Galina D

    2017-01-09

    The role of brain and liver mitochondria at epileptic seizure was studied on Krushinsky-Molodkina (KM) rats which respond to sound with an intensive epileptic seizure (audiogenic epilepsy). We didn't find significant changes in respiration rats of brain and liver mitochondria of KM and control rats; however the efficiency of АТР synthesis in the KM rat mitochondria was 10% lower. In rats with audiogenic epilepsy the concentration of oxidative stress marker malondialdehyde in mitochondria of the brain (but not liver) was 2-fold higher than that in the control rats. The rate of H2O2 generation in brain mitochondria of КМ rats was twofold higher than in the control animals when using NAD-dependent substrates. This difference was less pronounced in liver mitochondria. In KM rats, the activity of mitochondrial ATP-dependent potassium channel was lower than in liver mitochondria of control rats. The comparative study of the mitochondria ability to retain calcium ions revealed that in the case of using the complex I and complex II substrates, permeability transition pore is easier to trigger in brain and liver mitochondria of KM and КМs rats than in the control ones. The role of the changes in the energetic, oxidative, and ionic exchange in the mechanism of audiogenic epilepsy generation in rats and the possible correction of the epilepsy seizures are discussed.

  9. Effect of Danshao Huaxian capsule on expression of matrix metalloproteinase-1 and tissue inhibitor of metalloproteinase-1 in fibrotic liver of rats

    Institute of Scientific and Technical Information of China (English)

    Qin Yang; Ru-Jia Xie; Xiao-Xia Geng; Xin-Hua Luo; Bing Han; Ming-Liang Cheng

    2005-01-01

    AIM: To investigate the effects of Danshao Huaxian (DSHX)capsules, a preparation of traditional Chinese medicine,on the expression of matrix metalloproteinase-1 (MMP-1),and tissue inhibitor of metalloproteinase-1 (TIMP-1) in the fibrous livers of rats.METHODS: Eighty male Wistar rats were randomly divided into normal control group (group A), CCl4-induced hepatic fibrosis group (group B), non-DSHX-treated group (group C), low dose-treated group (group D), and high dose-treated group (group E). Fibrous liver models in rats were induced by subcutaneous injection of CCl4, oral administration of alcohol and high-lipid/low-protein diet for 8 wk. After the models were established, the rats in groups D and E were orally given a low dose (0.5 g/kg) and a high dose (1.0 g/kg) of DSHX daily for 8 wk, respectively.Then, the liver indexes, serum hyaluronic acid (HA) and alanine aminotransferase (ALT) were examined. The degree of hepatic fibrosis was evaluated by optical microscopy.Hydroxyproline (Hyp) in the urine was determined, and the expression of MMP-1 and TIMP-1 was detected by immunohistochemical techniques.RESULTS: In groups D and E, the liver indexes, levels of serum HA and ALT reduced and development of hepaticfibrosis weakened significantly. The urinary Hyp and expression of MMP-1 in the liver tissues elevated, but the expression of TIMP-1 decreased obviously, as compared to groups B and C.CONCLUSION: DSHX enhances the expression of MMP-1but decreases that of TIMP-1 in liver tissues of CCl4-induced hepatic fibrotic rats, which may result in its elevated activity that contributes to fighting against hepatic fibrosis.

  10. Choline treatment affects the liver reticuloendothelial system and plasma fatty acid composition in diabetic rats.

    Science.gov (United States)

    Al-Saeedi, Fatma J; Cheng, Behling

    2013-07-01

    This study investigated effects of choline treatment on hepatic reticuloendothelial and biliary functions and plasma fatty acid composition in diabetic rats. Diabetes was induced by streptozotocin (STZ). Choline was administered to untreated rats and a portion of STZ-treated rats for two sequences of five consecutive days, separated by a 2-day interval. Hepatic functions were studied using (99m) Tc Tin (II) colloid (TIN) and 99 mTc mebrofenin [bromo-iminodiacetic acid (BrIDA)] imaging. The TIN-uptake ratios (organ/whole body) of heart, liver and spleen, and the BrIDA-uptake ratios (organ or tissue/whole body) of liver, biliary tree and abdomen were obtained following imaging studies. Fatty acids were analysed by GC/MS. Choline treatment did not attenuate hyperglycaemic development. Diabetic rats showed (i) a decreased TIN-uptake ratio in liver with co-increased ratios in heart and spleen; choline treatment diminished these changes, (ii) elevated BrIDA-uptake ratios in biliary tree and abdomen but not in liver; choline treatment did not attenuate the elevations and (iii) decreases in plasma palmitoleic acid and oleic acid, reflecting an impaired stearoyl-CoA desaturase function; choline treatment did not affect the diminutions, but caused a decrease in arachidonic acid with a co-increase in linoleic acid. Some rats developed hypoproteinemia (HPO). HPO rats also exhibited decreases in plasma palmitoleic acid and oleic acid. Diabetes caused almost absence of palmitoleic acid in HPO rats. Choline treatment exerted no effect on the plasma fatty acid composition of diabetic HPO rats. Choline treatment affected hepatic reticuloendothelial function and plasma fatty acid composition, but not hepatobiliary function, in diabetic rats. Whether choline treatment is beneficial requires further studies. © 2013 The Authors Clinical Physiology and Functional Imaging © 2013 Scandinavian Society of Clinical Physiology and Nuclear Medicine.

  11. Hepatoprotective activity of bacoside A against N-nitrosodiethylamine-induced liver toxicity in adult rats.

    Science.gov (United States)

    Janani, Panneerselvam; Sivakumari, Kanakarajan; Parthasarathy, Chandrakesan

    2009-10-01

    N-Nitrosodiethylamine (DEN) is a notorious carcinogen, present in many environmental factors. DEN induces oxidative stress and cellular injury due to enhanced generation of reactive oxygen species; free radical scavengers protect the membranes from DEN-induced damage. The present study was designed to evaluate the protective effect of bacoside A (the active principle isolated from Bacopa monniera Linn.) on carcinogen-induced damage in rat liver. Adult male albino rats were pretreated with 15 mg/kg body weight/day of bacoside A orally (for 14 days) and then intoxicated with single necrogenic dose of N-nitrosodiethylamine (200 mg/kg bodyweight, intraperitonially) and maintained for 7 days. The liver weight, lipid peroxidation (LPO), and activity of serum marker enzymes (aspartate transaminases, alanine transaminases, lactate dehydrogenase, alkaline phosphatase, and gamma-glutamyl transpeptidase) were markedly increased in carcinogen-administered rats, whereas the activities of marker enzymes were near normal in bacoside A-pretreated rats. Activities of antioxidant enzymes (superoxide dismutase, catalase, glutathione peroxidase, glutathione reductase, glutatione-S-transferase, and reduced glutathione) in liver also decreased in carcinogen-administered rats, which were significantly elevated in bacoside A-pretreated rats. It is concluded that pretreatment of bacoside A prevents the elevation of LPO and activity of serum marker enzymes and maintains the antioxidant system and thus protects the rats from DEN-induced hepatotoxicity.

  12. Copper Transporter 2 Content Is Lower in Liver and Heart of Copper-Deficient Rats

    Directory of Open Access Journals (Sweden)

    Jesse Bertinato

    2010-11-01

    Full Text Available Copper (Cu transporter 2 (Ctr2 is a transmembrane protein that transports Cu across cell membranes and increases cytosolic Cu levels. Experiments using cell lines have suggested that Ctr2 expression is regulated by Cu status. The importance of changes in Ctr2 expression is underscored by recent studies demonstrating that lower Ctr2 content in cells increases the cellular uptake of platinum-containing cancer drugs and toxicity to the drugs. In this study, we examined whether Ctr2 expression is altered by a nutritional Cu deficiency in vivo. Ctr2 mRNA and protein in liver and heart from rats fed a normal (Cu-N, moderately deficient (Cu-M or deficient (Cu-D Cu diet was measured. Rats fed the Cu-deficient diets showed a dose-dependent decrease in liver Ctr2 protein compared to Cu-N rats. Ctr2 protein was 42% and 85% lower in Cu-M and Cu-D rats, respectively. Liver Ctr2 mRNA was 50% lower in Cu-D rats and unaffected in Cu-M rats. In heart, Ctr2 protein was only lower in Cu-D rats (46% lower. These data show that Cu deficiency decreases Ctr2 content in vivo.

  13. The Preventive Effect of Vitamin C on Styrene-Induced Toxicity in Rat Liver and Kidney

    Directory of Open Access Journals (Sweden)

    Ahmadizadeh

    2015-04-01

    Full Text Available Background Styrene (ST is widely used as an organic solvent in many industrial settings. Increasing evidence indicated that ST induced toxicity in human and animals. Occupational exposure to ST can result in multiple-organ toxicity. Objectives The aim of the present study was to investigate the preventive effect of vitamin C (Vit C on ST- induced toxicity in rat liver and kidney. Materials and Methods Adult male rats were pretreated with 300 mg/kg Vit C intraperitoneally. Control rats received vehicle only (distilled water, D H2O. Thirty minutes later, animals were given different doses (0, 200, 400, or 600 mg/kg of ST. Twenty-four hours later, animals were killed and their blood samples were processed for determination of biochemical parameters. Liver damage was estimated by measuring serum aspartate aminotransferase (AST, alanine aminotransferase (ALT, and alkaline phosphatase (ALP activity. nephrotoxicity was evaluated by measuring blood urea nitrogen (BUN and creatinine (CR concentrations. Liver and kidney tissues were removed, fixed and processed for light microscopy. Results Styrene induced a dose-dependent elevation in the AST, ALT, ALP, BUN, and CR levels when compared to those of the control animals. The liver and kidney tissues were intact in control rats. Moreover, ST provoked a dose-dependent injury in the liver and kidney tissues. Vitamin C significantly decreased all biochemical parameters and protected liver and kidney cells against ST-induced toxicity. Conclusions The results of this study showed that Vit C has potential to protect rat liver and kidney tissues against styrene toxicity.

  14. Effects of L-malate on mitochondrial oxidoreductases in liver of aged rats.

    Science.gov (United States)

    Wu, J-L; Wu, Q-P; Peng, Y-P; Zhang, J-M

    2011-01-01

    Accumulation of oxidative damage has been implicated to be a major causative factor in the decline in physiological functions that occur during the aging process. The mitochondrial respiratory chain is a powerful source of reactive oxygen species (ROS), considered as the pathogenic agent of many diseases and aging. L-malate, a tricarboxylic acid cycle intermediate, plays an important role in transporting NADH from cytosol to mitochondria for energy production. Previous studies in our laboratory reported L-malate as a free radical scavenger in aged rats. In the present study we focused on the effect of L-malate on the activities of electron transport chain in young and aged rats. We found that mitochondrial membrane potential (MMP) and the activities of succinate dehydrogenase, NADH-cytochrome c oxidoreductase and cytochrome c oxidase in liver of aged rats were significantly decreased when compared to young control rats. Supplementation of L-malate to aged rats for 30 days slightly increased MMP and improved the activities of NADH-dehydrogenase, NADH-cytochrome c oxidoreductase and cytochrome c oxidase in liver of aged rats when compared with aged control rats. In young rats, L-malate administration increased only the activity of NADH-dehydrogenase. Our result suggested that L-malate could improve the activities of electron transport chain enzymes in aged rats.

  15. Species and sex differences in propofol glucuronidation in liver microsomes of humans, monkeys, rats and mice.

    Science.gov (United States)

    Mukai, M; Isobe, T; Okada, K; Murata, M; Shigeyama, M; Hanioka, N

    2015-07-01

    Propofol (2,6-diisopropylphenol) is a short-acting anesthetic commonly used in clinical practice, and is rapidly metabolized into glucuronide by UDP-glucuronosyltransferase (UGT). In the present study, propofol glucuronidation was examined in the liver microsomes of male and female humans, monkeys, rats, and mice. The kinetics of propofol glucuronidation by liver microsomes fit the substrate inhibition model for humans and mice, the Hill model for monkeys, and the isoenzyme (biphasic) model for rats. The K(m), V(max), and CL(int) values of human liver microsomes were 50 μM, 5.6 nmol/min/mg protein, and 110 μL/min/mg protein, respectively, for males, and 46 μM, 6.0 nmol/min/mg protein, and 130 μL/min/mg protein, respectively, for females. The rank order of the CL(int) or CL(max) (in vitro clearance) values of liver microsomes was mice humans > monkeys > rats (high-affinity phase) rats (low-affinity phase) in both males and females. Although no significant sex differences were observed in the values of kinetic parameters in any animal species, the in vitro clearance values of liver microsomes were males females in monkeys, rats (high-affinity phase), and mice. These results demonstrated that the kinetic profile of propofol glucuronidation by liver microsomes markedly differed among humans, monkeys, rats, and mice, and suggest that species and sex differences exist in the roles of UGT isoform(s), including UGT1A9, involved in its metabolism.

  16. Organic and Conventional Yerba Mate (Ilex paraguariensis A. St. Hil Improves Metabolic Redox Status of Liver and Serum in Wistar Rats

    Directory of Open Access Journals (Sweden)

    Cátia S. Branco

    2013-07-01

    Full Text Available Organic and conventional yerba mate (Ilex paraguariensis is widely used in South America to prepare nonalcoholic drinks rich in polyphenols. These compounds are able to prevent the generation of reactive species, thus minimizing the incidence of several diseases. In this perspective, we hypothesized that yerba mate may have protective effects against pentylenetetrazol (PTZ-induced oxidative damage in liver and serum of rats. Animals (n = 42 received distilled water (control or yerba mate (organic or conventional for fifteen days. Then, half of the rats of each group received 60 mg/kg PTZ intraperitoneally or saline solution. After 30 min the animals were euthanized and the liver and blood were collected. The results showed that organic and conventional yerba mate avoided PTZ-induced oxidative damage and nitric oxide production in the liver and serum of the rats. Moreover, both kinds of yerba mate prevented the decrease in enzymatic (superoxide dismutase and catalase and non-enzymatic (sulfhydryl protein content defenses in the liver and serum. In addition, histopathologic analysis of the liver showed that yerba mate reduced PTZ-induced cell damage. These findings indicate that yerba mate provides hepatoprotection and improves antioxidant status in the serum, which may contribute to the development of new therapeutic strategies using nutraceuticals drinks.

  17. The deiodination of thyroid hormone in rat liver

    NARCIS (Netherlands)

    J.A. Mol

    1985-01-01

    textabstractAs mentioned in the preceding paragraphs, enzymatic deiodination of T4 is the most important route for the production of the biologically active thyroid hormone, T3• The liver is regarded as the principal site for the peripheral production of T3. Besides deiodination the liver is also

  18. Can the rat donor liver tolerate prolonged warm ischemia ?

    Institute of Scientific and Technical Information of China (English)

    Ji Qi Yan; Hong Wei Li; Wei Yao Cai; Ming Jun Zhang; Wei Ping Yang

    2000-01-01

    The last two decades of the twentieth century have witnessed increasingly successful rates of liver transplantation. The number of liver transplantations has increased steadily while the number of organ donors has remained relatively constant. Thus a great disparity has developed between the demand and supply of donor organs and remains a major limiting factor for further expansion of liver transplantation. Although many procedures, such as split liver[1] , living-related transplantation[2] , and xenotransplantation[3], have been attempted clinically to overcome the shortage, it is hoped that livers harvested from non-heart-beating donors (NHBDs) would alleviatethe problem of organ shortage, which again becomes the focus of attention[4-9]. However, sensitivity of the liver to warm ischemia remains a major worry for use of theNHBDs. The aim of this animal study was to assess if murine liver could tolerate prolonged period of warm ischemia and to determine the optimum timing of intervention in the cadaver donor in order to preserve liver viability.

  19. Protective Effect of Zizphus Vulgaris Extract, on Liver Toxicity in Laboratory Rats

    OpenAIRE

    S. Ebrahimi; Sadeghi, H.; A Pourmahmoudi; SH Askariyan; Askari, S

    2011-01-01

    Introduction & Objective: Some of natural and synthetic products have antioxidant properties which protect the liver against the destructive factors. This study aimed to investigate the effect of Zizphus Vulgaris extracts on mice liver. Materials & Methods: This experimental study was conducted at Yasouj University of Medical Sciences in 2010 on 30 healthy adult male Wistar rats. Animals were randomly divided into five equal groups: the control group (receiving, olive oil), control group ...

  20. Effect of x radiation on hydroperoxidase activity of rat liver microsomes

    Energy Technology Data Exchange (ETDEWEB)

    Platonov, A.G.; Deev, L.I.

    1979-06-01

    The effect of single exposure to total-body x radiation on hydroperoxidase activity (HPA) of rat liver microsomes and levels of cytochromes P-450 and b/sub 5/ in them were studied. Cytochrome b/sub 5/ content was measured in view of data indicative of the possible involvement of this enzyme in breaking down hydroperoxides of the microsomal fraction of the liver.

  1. Hepatoprotective activity of Haridradi ghrita on carbon tetrachloride-induced liver damage in rats.

    Science.gov (United States)

    Satturwar, P M; Fulzele, S V; Joshi, S B; Dorle, A K

    2003-12-01

    Haridradi ghrita, a ghee based polyherbal formulation, (50, 100, 200 and 300 mg/kg) significantly lowered marker enzymes (SGPT, SGOT, ALP) and bilirubin in serum and liver peroxide, superoxide dismutase and catalase in liver homogenate following CCl4 (0.7 ml/kg, ip) toxicity. The protective effect was further supported by reversal of CCl4 induced histological changes. The results demonstrate significant hepatoprotective action of H. ghrita in CCl4 damaged rats.

  2. Improved technique of heterotopic auxiliary rat liver transplantation with portal vein arterialization.

    Science.gov (United States)

    Schleimer, Karina; Stippel, Dirk L; Tawadros, Samir; Hölzen, J; Hölscher, A H; Beckurts, K Tobias E

    2006-04-01

    In acute, potentially reversible hepatic failure, auxiliary liver transplantation is a promising alternative approach. Using the auxiliary partial orthotopic liver transplantation (APOLT) method--the orthotopic implantation of auxiliary segments--most of the technical problems (lack of space for the additional liver mass, the portal vein reconstruction, and the venous outflow) are avoided, but extensive resections of the native liver and the graft are necessary. Erhard described the heterotopic auxiliary liver transplantation (HALT) with portal vein arterialization (PVA). Initial clinical results demonstrated that an adequate liver function can be achieved using this technique. We developed and improved a technique of HALT with flow-regulated PVA in the rat to perform further investigations. The aim of this paper is to explain in detail this improved experimental surgical technique. Liver transplantations were performed in 122 male Lewis rats: After a right nephrectomy, the liver graft, which was reduced to about 30% of the original size, was implanted into the right upper quadrant of the recipient's abdomen. The infrahepatic caval vein was anastomosed end-to-side. The donor's portal vein was completely arterialized to the recipient's right renal artery in stent technique. Using a stent with an internal diameter of 0.3 mm, the flow in the arterialized portal vein was regulated to achieve physiologic parameters. The celiac trunk of the graft was anastomosed to the recipient's aorta, end-to-side. The bile duct was implanted into the duodenum. After improvements of the surgical technique, we achieved a perioperative survival of 90% and a 6-week survival of 80% in the last 112 transplantations. We developed a standardized and improved technique, which can be used for experiments of regeneration and inter-liver competition in auxiliary liver transplantation. Furthermore, this technique is suitable for the investigation of the influence of portal vein arterialization and

  3. Methylene blue attenuates acute liver injury induced by paraquat in rats.

    Science.gov (United States)

    Chen, Jun-Liang; Dai, Li; Zhang, Peng; Chen, Wei; Cai, Gao-Shan; Qi, Xiao-Wei; Hu, Ming-Zhu; Du, Bin; Pang, Qing-Feng

    2015-09-01

    Paraquat (PQ) poisoning often leads to severe oxidative liver injury. Recent studies have reported that methylene blue (MB) can prevent oxidative stress-induced diseases. This study tested the hypothesis that MB treatment reduced acute liver injury induced by PQ in rats. Adult male Sprague-Dawley (SD) rats were randomly divided into four groups: (1) normal group, (2) MB group (2mg/kg i.p.), (3) PQ group (35 mg/kg i.p.) and (4) PQ+MB group (MB 2mg/kg i.p. administrated 2h after PQ). We evaluated the changes of liver histopathology, serum liver enzymatic activities, oxidative stress, heme oxygenase-1 expression, and mitochondrial permeability transition. The rats were injected with PQ produced liver injury, evidenced by histological changes and elevated serum alkaline phosphatase and alanine transaminase levels; PQ also led to oxidative stress, an increase of malondialdehyde content and mitochondrial permeability transition pore opening. Pathological damage and all of the above mentioned markers were reversed in the animals treated with MB than in those who received PQ alone. Meanwhile, MB significantly increased the contents of superoxide dismutase, adenosine triphosphate and the expression of heme oxygenase-1. In conclusion, MB had a protective effect against PQ-induced hepatic damage in rats. The mechanisms of the protection seem to be the inhibition of mitochondrial permeability transition opening and the increase of heme oxygenase-1 expression.

  4. Dehydroepiandrosterone (DHEA Feeding Protects Liver Steatosis in Obese Breast Cancer Rat Model

    Directory of Open Access Journals (Sweden)

    Reza Hakkak

    2017-03-01

    Full Text Available Obesity is a major health problem in the US and globally. Obesity is associated with the risk of cardiovascular disease, type 2 diabetes, cancers, hyperlipidemia, and liver steatosis development. Dehydroepiandrosterone (DHEA is a dietary supplement used as an anti-obesity supplement. Previously, we reported that DHEA feeding protects 7,12-dimethylbenz(aanthracene (DMBA-induced mammary tumors. The objectives of this study were to investigate the effects of obesity and DHEA feeding on liver steatosis, body weight gain, and serum DHEA, DHEA sulfate (DHEA-S, insulin-like growth factor-1 (IGF-1, and insulin-like growth factor binding protein-3 (IGFBP-3 levels. Female Zucker rats were randomly assigned to either a control diet or a control diet with DHEA supplementation for 155 days. Livers were collected for histological examination. Serum was collected to measure DHEA, DHEA-S, IGF-1, and IGFBP-3. Our results show that DHEA-fed rats had significantly less liver steatosis (p < 0.001 than control-fed rats and gained less weight (p < 0.001. DHEA feeding caused significant decreases (p < 0.001 in the serum levels of IGF-1 and IGFBP-3 and significantly increased (p < 0.001 serum levels of DHEA and DHEA-S. Our results suggest that DHEA feeding can protect against liver steatosis by reducing body weight gain and modulating serum IGF-1 and IGFBP-3 levels in an obese breast cancer rat model.

  5. Adeno-associated viral vector serotype 5 poorly transduces liver in rat models.

    Directory of Open Access Journals (Sweden)

    Paula S Montenegro-Miranda

    Full Text Available Preclinical studies in mice and non-human primates showed that AAV serotype 5 provides efficient liver transduction and as such seems a promising vector for liver directed gene therapy. An advantage of AAV5 compared to serotype 8 already shown to provide efficient correction in a phase 1 trial in patients suffering from hemophilia B, is its lower seroprevalence in the general population. Our goal is liver directed gene therapy for Crigler-Najjar syndrome type I, inherited severe unconjugated hyperbilirubinemia caused by UGT1A1 deficiency. In a relevant animal model, the Gunn rat, we compared the efficacy of AAV 5 and 8 to that of AAV1 previously shown to be effective. Ferrying a construct driving hepatocyte specific expression of UGT1A1, both AAV8 and AAV1 provided an efficient correction of hyperbilirubinemia. In contrast to these two and to other animal models AAV5 failed to provide any correction. To clarify whether this unexpected finding was due to the rat model used or due to a problem with AAV5, the efficacy of this serotype was compared in a mouse and two additional rat strains. Administration of an AAV5 vector expressing luciferase under the control of a liver specific promoter confirmed that this serotype poorly performed in rat liver, rendering it not suitable for proof of concept studies in this species.

  6. Repeated-dose liver micronucleus test of 4,4'-methylenedianiline using young adult rats.

    Science.gov (United States)

    Sanada, Hisakazu; Koyama, Naomi; Wako, Yumi; Kawasako, Kazufumi; Hamada, Shuichi

    2015-03-01

    Liver micronucleus (MN) tests using partial hepatectomized rats or juvenile rats have been shown to be useful for the detection of hepatic carcinogens. Moreover, Narumi et al. established the repeated-dose liver MN test using young adult rats for integration into general toxicity. In the present study, in order to examine the usefulness of the repeated-dose liver MN test, we investigated MN induction with a 14 or 28 day treatment protocol using young adult rats treated with 4,4′-methylenedianiline (MDA), a known hepatic carcinogen. MDA dose-dependently induced micronuclei in hepatocytes in 14- and 28-day repeated-dose tests. However, although statistically significant increases in micronuclei were observed in bone marrow cells at two dose levels in the 14-day study, there was no dose response and no increases in micronuclei in the 28-day study. These results indicate that the evaluation of genotoxic effects using hepatocytes is effective in cases where chromosomal aberrations are not clearly detectable in bone marrow cells. Moreover, the repeated-dose liver MN test allows evaluation at a dose below the maximum tolerable dose, which is required for the conventional MN test because micronucleated hepatocytes accumulate. The repeated-dose liver MN test employed in the present study can be integrated into the spectrum of general toxicity tests without further procedural modifications.

  7. THE EXCHANGE OF CONNECTIVE TISSUE BIOPOLYMERS IN THE LIVER OF ALLOXAN DIABETIC RATS

    Directory of Open Access Journals (Sweden)

    S. V. Lomaeva

    2013-01-01

    Full Text Available Aim. Study of the exchange of liver and blood plasma biopolymers of alloxan diabetic rats.Materials and Methods. Diabetes mellitus was modeled in rats by single subcutaneous injection of alloxan tetrahydrate (170 mg per100 gbody weight. Blood glucose, glycosylated hemoglobin were controlled and morphometric study of the pancreas was carried out for the verification of the model. A month later, concentration of glycosaminoglycans, free hydroxyproline and the level of hyaluronidase and collagenolytic activity in plasma were determined. The total concentration of collagen, glycosaminoglycans, and their fractions, the level of hyaluronidase and collagenolytic activity in rat liver homogenate were measured.Results. The level of all the parameters of interest in the liver and blood plasma increased on 30 day after alloxan injection, the accumulation of glycosaminoglycans in the liver occurred mainly due to unsulfonated fraction.Conclusion. The development of experimental diabetes in rats is accompanied by activation of both decay processes and synthesis of biopolymers studied. Accumulation of total collagen and glycosaminoglycans was observed in rats’ liver, which probably lead to the fibrosis changes in it.

  8. Effect of matrine on Kupffer cell activation in cold ischemia reperfusion injury of rat liver

    Institute of Scientific and Technical Information of China (English)

    Xin-Hua Zhu; Yu-Dong Qiu; Hao Shen; Ming-Ke Shi; Yi-Tao Ding

    2002-01-01

    AIM: To study the effect of matrine on activation of Kupffer cell during cold ischemia and reperfusion injury in rat orthotopic liver transplantation (OLT).METHODS: 168 syngeneic SD rats were randomly divided into four groups: untreated group, small-dose treated group, large-dose treated group and sham operation group. After 5 hours of preservation in Ringer's (LR) solution, orthotopic implantation of the donor liver was performed. At 1 h, 2 h, 4 h and 24 h after reperfusion of the portal vein, 6 rats were killed in each group to collect the serum and the liver for assay and pathology.RESULTS: Matrine markedly inhibited the activation of Kupffer cells and their release of tumor necrosis factor (TNF). TNF cytotoxicity level at 2 h decreased significantly by matrine treatment (7.94±0.42, 2.39±0.19 and 2.01±0.13 U/ml,respectively; P<0.01), so did the other three time points. The level of hylluronic acid (HA) and alanine transaminase (ALT) decreased significantly in both treated groups, and matrine treatment markedly ameliorated focal necrosis of hepatocytes, inflammatory cells aggregating, rounding and detachment of sinusoidal endothelial cells (SEC). And no significant difference was observed between the treated groups.CONCLUSION: Matrine can inhibit the activation of Kupffer cell and prevent the donor liver from cold preservation and reperfusion injury in rat orthotopic liver transplantation.

  9. Protective effect of doxorubicin induced heat shock protein 72 on cold preservation injury of rat livers

    Institute of Scientific and Technical Information of China (English)

    Hao Chen; Ying-Yan Yu; Ming-Jun Zhang; Xia-Xing Deng; Wei-Ping Yang; Jun Ji; Cheng-Hong Peng; Hong-Wei Li

    2004-01-01

    AIM: To observe the protective effect of heat shock protein 72 (HSP 72) induced by pretreatment of doxorubicin (DXR)on long-term cold preservation injury of rat livers.METHODS: Sprague-Dawley rats were administered intravenously DXR at a dose of 1 mg/kg body mass in DXR group and saline in control group. After 48 h, the rat liver was perfused with cold Linger′s and University of Wisconsin (UW) solutions and then was preserved in UW solution at 4 ℃ for 24, 36 and 48 h. AST, ALT, LDH and hyaluronic acid in preservative solution were determined. Routine HE,immunohistochemical staining for HSP 72 and electron microscopic examination of hepatic tissues were performed.RESULTS: After 24, 36 and 48 h, the levels of AST, ALT and hyaluronic acid in preservative solution were significantly higher in control group than in DXR group (P<0.05), while LDH level was not significantly different between the 2 groups (P>0.05). Hepatic tissues in DXR group were morphologically normal and significantly injured in control group. HSP 72was expressed in hepatocytes and sinusoidal endothelial cells in DXR group but not in control group.CONCLUSION: Pretreatment of DXR may extend the time of rat liver cold preservation and keep liver alive. The expression of HSP 72 in liver can prevent hepatocytes and sinusoidal endothelial cells from long-term cold preservation injury.

  10. Structures of nucleolus and transcription sites of rRNA genes in rat liver cells

    Institute of Scientific and Technical Information of China (English)

    陶伟; 焦明大; 赫杰; 何孟元; 郝水

    2000-01-01

    We observed the ultrastructure of nucleolus in rat liver cells by conventional electron microscopy, and employed cytochemistry NAMA-Ur DNA specific stain method to analyze the distribution and position of nucleolar DNA in situ. The results showed that nucleolar DNA of rat liver cells comes from nucleolus-associated chromatin, and continuously extends in the dense fibrillar component (DFC) of nucleolus, localizes at the periphery of fibrillar center (FC) and in DFC. Furthermore, by employing anti-DNA/RNA hybrid antibodies, we directly and selectively labeled transcription sites of rRNA genes and testified that localization of transcription sites not only to DFC but also to the periphery of FC.

  11. Influence of epidermal growth factor on liver regeneration after partial hepatectomy in rats

    DEFF Research Database (Denmark)

    Olsen, Peter Skov; Boesby, S.; Kirkegaard, P.;

    2013-01-01

    growth factor could be identified in portal venous blood after intestinal instillation of epidermal growth factor. Brunner's glands and the submandibular glands secrete epidermal growth factor. Extirpation of Brunner's glands decreased liver regeneration, whereas removal of the submandibular glands had......The role of epidermal growth factor on liver regeneration after partial hepatectomy in rats was investigated. After a 70% hepatectomy in rats, the concentration of epidermal growth factor in portal venous blood was unchanged compared with unoperated controls. However, small amounts of epidermal...

  12. Liver oxidation and inflammation in Fa/Fa rats fed glucomannan/spirulina-surimi.

    Science.gov (United States)

    Vázquez-Velasco, Miguel; González-Torres, Laura; López-Gasco, Patricia; Bastida, Sara; Benedí, Juana; Sánchez-Reus, María Isabel; González-Muñoz, María José; Sánchez-Muniz, Francisco J

    2014-09-15

    The effect of high-fat squid-surimi diets enriched in glucomannan or glucomannan-spirulina on lipemia, liver glutathione status, antioxidant enzymes and inflammation biomarkers was determined in Zucker Fa/Fa rats. Groups of eight rats each received for 7weeks the squid-surimi control (C), glucomannan-enriched squid-surimi (G) and glucomannan-spirulina enriched squid-surimi (GS). Liver weight, cytochrome P450 7A1 expression and cholesterolemia were decreased in G and GS vs. C, improving glutathione red-ox index (pspirulina kept those hypocholesterolemic and antioxidant effects but reduced the inflammation observed. Copyright © 2014 Elsevier Ltd. All rights reserved.

  13. Internal radiotherapy of liver cancer with rat hepato-carcinoma-intestine-pancreas gene as a liver tumor-specific promoter

    Energy Technology Data Exchange (ETDEWEB)

    Herve, J.; Cunha, A. Sa; Liu, B.; Valogne, Y.; Longuet, M.; Bregerie, O.; Guettier, C.; Samuel, D.; Brechot, C.; Faivre, J. [Hop Paul Brousse, INSERM, Hepatobiliary Ctr, U785, F-94800 Villejuif (France); Herve, J.; Cunha, A. Sa; Liu, B.; Valogne, Y.; Longuet, M.; Bregerie, O.; Guettier, C.; Samuel, D.; Brechot, C.; Faivre, J. [Univ Paris Sud, Fac Med, F-94800 Villejuif (France); Boisgard, R.; Tavitian, B. [INSERM, U803, F-91400 Orsay (France); Boisgard, R.; Tavitian, B. [CEA, Serv Hosp Frederic Joliot, Lab Imagerie Mol Expt, F-91400 Orsay (France); Roux, J.; Cales, P. [Univ Angers, UPRES EA 3859, Lab Hemodynam Interact Fibrose et Invas Tumorale H, Angers (France); Clerc, J. [Hop Cochin, AP HP, Dept Nucl Med, F-75014 Paris (France)

    2008-07-01

    The hepato-carcinoma-intestine-pancreas (HIP) gene, also called pancreatitis-associated protein-1 (PAP1) or Reg III {alpha}, is activated in most human hepatocellular carcinomas (HCCs) but not in normal liver, which suggests that HIP regulatory sequence could be used as efficient liver tumor-specific promoters to express a therapeutic polynucleotide in liver cancer. The sodium iodide sym-porter (NIS), which has recognized therapeutic and reporter gene properties, is appropriate to evaluate the transcriptional strength and specificity of the HIP promoter in HCC. For this purpose, we constructed a recombinant rat HIP-NIS adeno-viral vector (AdrHIP-NIS), and evaluated its performance as a mediator of selective radio-iodide uptake in tumor hepatocytes. Western blot, immunofluorescence, and iodide uptake assays were performed in AdrHIP-NIS-infected primary hepatocytes and transformed hepatic and non-hepatic cells. Nuclear imaging, tissue counting and immuno-histo-chemistry were performed in normal and HCC-bearing Wistar rats infected with AdrHIP-NIS intra-tumorally or via the hepatic artery. In AdrHIP-NIS-infected transformed hepatic cells, functional NIS was strongly expressed, as in cells infected with a cytomegalovirus-NIS vector. No NIS expression was found in AdrHIP-NIS-infected normal hepatocytes or transformed non-hepatic cells. In rats bearing multi-nodular HCC, AdrHIP-NIS triggered functional NIS expression that was preferential in tumor hepatocytes. Administration of 18 mCi of {sup 131}I resulted in the destruction of AdrHIP-NIS-injected nodules. This study has identified the rHIP regulatory sequence as a potent liver tumor-specific promoter for the transfer of therapeutic genes, and AdrHIP-NIS-mediated. {sup 131}I therapy as a valuable option for the treatment of multi-nodular HCC. (authors)

  14. Relaxin as a protective substance in the preserving solution for liver transplantation: spectrophotometric in vivo imaging of local oxygen supply in an isolated perfused rat liver model.

    Science.gov (United States)

    Boehnert, Markus U; Armbruster, Franz Paul; Hilbig, Heidegard

    2009-04-01

    Ischemia reperfusion injury (IRI) is a problem in organ transplantation. Relaxin is known to have a protective effect against liver injury caused by IRI. Using a model of isolated perfused rat liver, the local oxygen supply in liver tissue was investigated by spectrophotometric in vivo imaging and compared to the protective effect of relaxin shown by immunohistochemical measurement of myeloperoxidase and malonyldialdehyde activities as determinants of oxidative stress. In relaxin-treated liver tissue, spectrophotometry showed a better oxygen supply and decreased myeloperoxidase and malonyldialdehyde activities. Our data suggest that relaxin can influence the oxygen distribution in liver tissue and reduce cell damage caused by IRI.

  15. Corrections by melatonin of liver mitochondrial disorders under diabetes and acute intoxication in rats.

    Science.gov (United States)

    Cheshchevik, Vitali T; Dremza, Iosif K; Lapshina, Elena A; Zabrodskaya, Svetlana V; Kujawa, Jolanta; Zavodnik, Ilya B

    2011-08-01

    The aim of the present work was to investigate the mechanisms of oxidative damage of the liver mitochondria under diabetes and intoxication in rats as well as to evaluate the possibility of corrections of mitochondrial disorders by pharmacological doses of melatonin. The experimental (30 days) streptozotocin-induced diabetes mellitus caused a significant damage of the respiratory activity in rat liver mitochondria. In the case of succinate as a respiratory substrate, the ADP-stimulated respiration rate V₃ considerably decreased (by 25%, p diabetic liver damage. Acute rat carbon tetrachloride-induced intoxication resulted in considerable decrease of the phosphorylation coefficient because of uncoupling of the oxidation and phosphorylation processes in the liver mitochondria. The melatonin administration during diabetes (10 mg·kg⁻¹ body weight, 30 days, daily) showed a considerable protective effect on the liver mitochondrial function, reversing the decreased respiration rate V₃ and the diminished ACR to the control values both for succinate-dependent respiration and for glutamate-dependent respiration. The melatonin administration to intoxicated animals (10 mg·kg⁻¹ body weight, three times) partially increased the rate of succinate-dependent respiration coupled with phosphorylation. The impairment of mitochondrial respiratory plays a key role in the development of liver injury under diabetes and intoxication. Melatonin might be considered as an effector that regulates the mitochondrial function under diabetes.

  16. Reciprocal effects of dietary sesamin on ketogenesis and triacylglycerol secretion by the rat liver.

    Science.gov (United States)

    Fukuda, N; Miyagi, C; Zhang, L; Jayasooriya, A P; Sakono, M; Yamamoto, K; Ide, T; Sugano, M

    1998-10-01

    The effects of dietary sesamin (a mixture of sesamin and episesamin, 1:1, w/w) on ketone body production and lipid secretion were studied in isolated perfused liver from rats given sesamin. Feeding sesamin at the dietary level of 0.2% from 14 to 16 d resulted in an enlargement of liver weight. Ketone body production was significantly elevated in the livers perfused with oleic acid in comparison with those perfused without an exogenous-free fatty acid, and sesamin feeding caused a stimulation of ketone body production, especially when exogenous oleic acid was provided. On the other hand, the ratio of beta-hydroxybutyrate to acetoacetate, an index of mitochondrial redox potential, tended to increase in the livers perfused with oleic acid compared with those without fatty acid, thought it was consistently lowered by dietary sesamin. The cumulative secretion of triacylglycerol, but not of cholesterol, by the livers from sesamin-fed rats was decreased markedly, especially when exogenous oleic acid was provided, suggesting an inverse relationship between the rates of ketogenesis and triacylglycerol secretion. These results suggest that dietary sesamin exerts its hypotriglyceridemic effect at least in part through an enhanced metabolism of exogenous-free fatty acid to oxidation at the expense of esterification in rat liver.

  17. RNA interference against discoidin domain receptor 2 ameliorates alcoholic liver disease in rats.

    Directory of Open Access Journals (Sweden)

    Zheng Luo

    Full Text Available Discoidin domain receptor 2 (DDR2 is involved in fibrotic disease. However, the exact pathogenic implications of the receptor in early alcoholic liver disease are still controversial. We constructed plasmid vectors encoding short-hairpin RNA against DDR2 to investigate its role in alcoholic liver disease in an immortalized rat hepatic stellate cell line, HSC-T6, and in rats by MTT, RT-PCR and western blot analyses; immunohistochemistry and electron microscopy. Alcohol-induced upregulation of DDR2 was associated with the expression of matrix metalloproteinase 2, the transforming growth factor β1 signaling pathway and tissue inhibitor of metalloproteinase 1; collagen deposition; and extracellular matrix remodeling. Inhibition of DDR2 decreased HSC-T6 cell proliferation and liver injury in rats with 10-week-induced alcoholic liver disease. DDR2 may have an important role in the pathogenesis of early-stage alcoholic liver disease. Silencing DDR2 may be effective in preventing early-stage alcoholic liver disease.

  18. RNA interference against discoidin domain receptor 2 ameliorates alcoholic liver disease in rats.

    Science.gov (United States)

    Luo, Zheng; Liu, Huimin; Sun, Xiaomeng; Guo, Rong; Cui, Ruibing; Ma, Xiangxing; Yan, Ming

    2013-01-01

    Discoidin domain receptor 2 (DDR2) is involved in fibrotic disease. However, the exact pathogenic implications of the receptor in early alcoholic liver disease are still controversial. We constructed plasmid vectors encoding short-hairpin RNA against DDR2 to investigate its role in alcoholic liver disease in an immortalized rat hepatic stellate cell line, HSC-T6, and in rats by MTT, RT-PCR and western blot analyses; immunohistochemistry and electron microscopy. Alcohol-induced upregulation of DDR2 was associated with the expression of matrix metalloproteinase 2, the transforming growth factor β1 signaling pathway and tissue inhibitor of metalloproteinase 1; collagen deposition; and extracellular matrix remodeling. Inhibition of DDR2 decreased HSC-T6 cell proliferation and liver injury in rats with 10-week-induced alcoholic liver disease. DDR2 may have an important role in the pathogenesis of early-stage alcoholic liver disease. Silencing DDR2 may be effective in preventing early-stage alcoholic liver disease.

  19. Impact of dieldrin on liver morphological and biochemical parameters of rats.

    Science.gov (United States)

    Hallegue, Dorsaf; Tebourbi, Olfa; Kacem, Kamel; Sakly, Mohsen; Ben Rhouma, Khémaïs

    2010-04-01

    The current study deals with the effect of the organochlorine insecticide on the liver of Wistar rats. The dieldrin effect on rats was tested after a single intraperitoneal (i.p.) injection of two doses: 3 and 6 mg/kg and observations were made 4 days later. Animals showed a significant dose-dependent increase in relative liver weight. Elevations of transaminases (aspartate aminotransferase [AST], alanine aminotransferase [ALT]), bilirubin and total activity of lactate dehydrogenase (LDH) were recorded in the sera of treated rats. Serum LDH-5 isoenzyme activity increases in a dose-dependent manner. In contrast, LDH-1 activity does not show any significant variations with respect to controls. Histological examination of the liver of dieldrin-treated animals revealed cytoplasmic vacuolation, focal necrosis and nuclear enlargement of hepatocytes. This study suggests that biochemical assessment (transaminases, LDH and bilirubin activity) and LDH (LDH-1 & LDH-5) isoenzyme profiles can be very helpful in defining the border of the liver injury, dieldrin damaged liver would be a valuable addition to histological analysis in evaluating histopathological liver changes.

  20. Protective effects of Centella asiatica leaf extract on dimethylnitrosamine-induced liver injury in rats

    Science.gov (United States)

    Choi, Myung-Joo; Zheng, Hong-Mei; Kim, Jae Min; Lee, Kye Wan; Park, Yu Hwa; Lee, Don Haeng

    2016-01-01

    Oxidative stress in liver injury is a major pathogenetic factor in the progression of liver damage. Centella asiatica (L.) Urban, known in the United States as Gotu kola, is widely used as a traditional herbal medicine in Chinese or Indian Pennywort. The efficacy of Centella asiatica is comprehensive and is used as an anti-inflammatory agent, for memory improvement, for its antitumor activity and for treatment of gastric ulcers. The present study investigated the protective effects of Centella asiatica on dimethylnitrosamine (DMN)-induced liver injury in rats. The rats in the treatment groups were treated with Centella asiatica at either 100 or 200 mg/kg in distilled water (D.W) or with silymarin (200 mg/kg in D.W) by oral administration for 5 days daily following intraperitoneal injections of 30 mg/kg DMN. Centella asiatica significantly decreased the relative liver weights in the DMN-induced liver injury group, compared with the control. The assessment of liver histology showed that Centella asiatica significantly alleviated mass periportal ± bridging necrosis, intralobular degeneration and focal necrosis, with fibrosis of liver tissues. Additionally, Centella asiatica significantly decreased the level of malondialdehyde, significantly increased the levels of antioxidant enzymes, including superoxide dismutase, glutathione peroxidase and catalase, and may have provided protection against the deleterious effects of reactive oxygen species. In addition, Centella asiatica significantly decreased inflammatory mediators, including interleukin (IL)-1β, IL-2, IL-6, IL-10, IL-12, tumor necrosis factor-α, interferon-γ and granulocyte/macrophage colony-stimulating factor. These results suggested that Centella asiatica had hepatoprotective effects through increasing the levels of antioxidant enzymes and reducing the levels of inflammatory mediators in rats with DMN-induced liver injury. Therefore, Centella asiatica may be useful in preventing liver damage. PMID:27748812

  1. Effect of L-arginine supplement on liver regeneration after partial hepatectomy in rats

    Directory of Open Access Journals (Sweden)

    Kurokawa Tsuyoshi

    2012-05-01

    Full Text Available Abstract Background Nitric oxide (NO has been reported to be a key mediator in hepatocyte proliferation during liver regeneration. NO is the oxidative metabolite of L-arginine, and is produced by a family of enzymes, collective termed nitric oxide synthase (NOS. Thus, administration of L-arginine might enhance liver regeneration after a hepatectomy. Another amino acid, L-glutamine, which plays an important role in catabolic states and is a crucial factor in various cellular and organ functions, is widely known to enhance liver regeneration experimentally. Thus, the present study was undertaken to evaluate the effects of an L-arginine supplement on liver regeneration, and to compared this with supplementation with L-glutamine and L-alanine (the latter as a negative control, using a rat partial hepatectomy model. Methods Before and after a 70% hepatectomy, rats received one of three amino acid solutions (L-arginine, L-glutamine, or L-alanine. The effects on liver regeneration of the administered solutions were examined by assessment of restituted liver mass, staining for proliferating cell nuclear antigen (PCNA, and total RNA and DNA content 24 and 72 hours after the operation. Results At 72 hours after the hepatectomy, the restituted liver mass, the PCNA labeling index and the DNA quantity were all significantly higher in the L-arginine and L-glutamine groups than in the control. There were no significant differences in those parameters between the L-arginine and L-glutamine groups, nor were any significant differences found between the L-alanine group and the control. Conclusion Oral supplements of L-arginine and L-glutamine enhanced liver regeneration after hepatectomy in rats, suggesting that an oral arginine supplement can clinically improve recovery after a major liver resection.

  2. Expression patterns and action analysis of genes associated with blood coagulation responses during rat liver regeneration

    Institute of Scientific and Technical Information of China (English)

    Li-Feng Zhao; Wei-Min Zhang; Cun-Shuan Xu

    2006-01-01

    AIM:To study the blood coagulation response after partial hepatectomy (PH) at transcriptional level.METHODS:After PH of rats, the associated genes with blood coagulation were obtained through reference to the databases, and the gene expression changes in rat regenerating liver were analyzed by the Rat Genome 230 2.0 array.RESULTS: It was found that 107 genes were associated with liver regeneration. The initially and totally expressing gene numbers occurring in initiation phase of liver regeneration (0.5-4 h after PH), G0/G1 transition (4-6 h after PH), cell proliferation (6-66 h after PH), cell differentiation and structure-function reconstruction (66-168 h after PH) were 44, 11, 58, 7 and 44, 33,100, 71 respectively, showing that the associated genes were mainly triggered in the forepart and prophase, and worked at different phases. According to their expression similarity, these genes were classified into 5 groups:only up-, predominantly up-, only down-, predominantly down-, up- and down-regulation, involving 44, 8, 36,13 and 6 genes, respectively, and the total times of their up- and down-regulation expression were 342 and 253, respectively, demonstrating that the number of the up-regulated genes was more than that of the downregulated genes. Their time relevance was classified into 15 groups, showing that the cellular physiological and biochemical activities were staggered during liver regeneration. According to gene expression patterns,they were classified into 29 types, suggesting that their protein activities were diverse and complex during liver regeneration.CONCLUSION: The blood coagulation response is enhanced mainly in the forepart, prophase and anaphase of liver regeneration, in which the response in the forepart, prophase of liver regeneration can prevent the bleeding caused by partial hepatectomy, whereas that in the anaphase contributes to the structure-function reorganization of regenerating liver. In the process,107 genes associated with liver

  3. Coffee and caffeine protect against liver injury induced by thioacetamide in male Wistar rats.

    Science.gov (United States)

    Furtado, Kelly S; Prado, Monize G; Aguiar E Silva, Marco A; Dias, Marcos C; Rivelli, Diogo P; Rodrigues, Maria A M; Barbisan, Luis F

    2012-11-01

    Coffee intake has been inversely related to the incidence of liver diseases, although there are controversies on whether these beneficial effects on human health are because of caffeine or other specific components in this popular beverage. Thus, this study evaluated the protective effects of coffee or caffeine intake on liver injury induced by repeated thioacetamide (TAA) administration in male Wistar rats. Rats were randomized into five groups: one untreated group (G1) and four groups (G2-G5) treated with the hepatotoxicant TAA (200 mg/kg b.w., i.p.) twice a week for 8 weeks. Concomitantly, rats received tap water (G1 and G2), conventional coffee (G3), decaffeinated coffee (G4) or 0.1% caffeine (G5). After 8 weeks of treatment, rats were killed and blood and liver samples were collected. Conventional and decaffeinated coffee and caffeine intake significantly reduced serum levels of alanine aminotransferase (ALT) (p coffee and caffeine intake significantly reduced proliferating cellular nuclear antigen (PCNA) S-phase indexes (p coffee reduced cleaved caspase-3 indexes (p coffee and 0.1% caffeine intake presented better beneficial effects than decaffeinated coffee against liver injury induced by TAA in male Wistar rats. © 2012 The Authors Basic & Clinical Pharmacology & Toxicology © 2012 Nordic Pharmacological Society.

  4. PASS-Predicted Hepatoprotective Activity of Caesalpinia sappan in Thioacetamide-Induced Liver Fibrosis in Rats

    Directory of Open Access Journals (Sweden)

    Farkaad A. Kadir

    2014-01-01

    Full Text Available The antifibrotic effects of traditional medicinal herb Caesalpinia sappan (CS extract on liver fibrosis induced by thioacetamide (TAA and the expression of transforming growth factor β1 (TGF-β1, α-smooth muscle actin (αSMA, and proliferating cell nuclear antigen (PCNA in rats were studied. A computer-aided prediction of antioxidant and hepatoprotective activities was primarily performed with the Prediction Activity Spectra of the Substance (PASS Program. Liver fibrosis was induced in male Sprague Dawley rats by TAA administration (0.03% w/v in drinking water for a period of 12 weeks. Rats were divided into seven groups: control, TAA, Silymarin (SY, and CS 300 mg/kg body weight and 100 mg/kg groups. The effect of CS on liver fibrogenesis was determined by Masson’s trichrome staining, immunohistochemical analysis, and western blotting. In vivo determination of hepatic antioxidant activities, cytochrome P450 2E1 (CYP2E1, and matrix metalloproteinases (MPPS was employed. CS treatment had significantly increased hepatic antioxidant enzymes activity in the TAA-treated rats. Liver fibrosis was greatly alleviated in rats when treated with CS extract. CS treatment was noted to normalize the expression of TGF-β1, αSMA, PCNA, MMPs, and TIMP1 proteins. PASS-predicted plant activity could efficiently guide in selecting a promising pharmaceutical lead with high accuracy and required antioxidant and hepatoprotective properties.

  5. Glutamic oxaloacetic transaminase isozymes from rat liver. Purification and physicochemical characterization.

    Science.gov (United States)

    Huynh, Q K; Sakakibara, R; Watanabe, T; Wada, H

    1980-07-01

    Glutamic oxaloacetic transaminase isozymes were purified simultaneously to homogeneity from rat liver with high yields. Three subforms of mitochondrial isozyme and three subforms of cytosolic isozyme were separated by chromatography on CM-Sephadex and electrophoresis on polyacrylamide gel. The general enzymatic properties of the purified isozymes such as their kinetic parameters, isoelectric points, molecular weights, amino acid compositions, NH2-terminal amino acid sequences and COOH-terminal amino acids were determined. Most of these properties of the isozymes are similar to those of the corresponding isozymes from other sources, such as rat brain and pig and human heart. In amino acid compositions, cytosolic isozyme from rat liver has more proline and glycine and less arginine, threonine and leucine than pig heart cytosolic isozyme; the mitochondrial isozyme has more glutamic acid and glycine and less serine than the corresponding pig heart isozyme. The NH2-terminal amino acid sequences of GOT isozymes from rat liver were identical with those of the GOT isozymes from pig heart up to the 10th residues except for the 5th residues. The subforms of mitochondrial isozyme from rat liver were generated on storage at 4 degrees C for 4-8 weeks.

  6. The role of cyclooxygenase-2/prostanoid pathway in visceral pain induced liver stress response in rats

    Institute of Scientific and Technical Information of China (English)

    PISTON Donald; WANG Shan; FENG Yi; YE Ying-jiang; ZHOU Jing; JIANG Ke-wei; XU Feng; ZHAO Yong; CUI Zhi-rong

    2007-01-01

    Background Cyclooxygenase (COX) is the rate-limiting enzyme in the production of prostanoids from arachidonic acid.COX-2 is the inducible enzyme in the COX family, together with the prostanoids forms the COX-2/prostanoid pathway.Research showed that the COX-2/prostanoid pathway is activated in hepatic diseases and liver stress reaction, such as fibrogenesis, portal hypertension, carcinogenesis, and ischemic/reperfusion injury. But there was no report on visceral pain induced liver stress. This study was to investigate the role of the COX-2/prostanoid pathway in liver stress response in rat acute colitis visceral pain liver stress model.Methods Fifty-three male SD rats were randomly divided into Naive, Model, NS398 treatment, and Morphine treatment groups. The rat acute colitis visceral pain liver stress model was established under anesthesia by the colonic administration of 0.5 ml of 6% acetic acid using a urethral catheter. NS398 and morphine were administrated 30 minutes prior to model establishment in NS398 and Morphine treatment groups respectively. Spontaneous activities and pain behavior were counted and the extent of colonic inflammation was assessed histologically. Liver tissue levels of Glutathione-S-Transferase (GST) activity, COX-2 mRNA, prostaglandin E2 (PGE2), thromboxane B2 (TXB2) and 6-Ketone-prostaglandin F1α (6-K-PGF1α) contents were assessed.Results Thirty minutes after the colonic administration of acetic acid, a significant decrease in spontaneous activities and an increase in pain behaviors were observed in Model group (P<0.01 and P<0.05 respectively), accompanied by colonic inflammation. Liver GST activity levels significantly dropped (P<0.05). Liver COX-2 mRNA expression significantly increased, accompanied by an increase in liver concentrations of PGE2 and TXB2, but no obvious change in 6-K-PGF1α concentrations. NS398 and morphine both ameliorated post-stress liver GST activity (P<0.05 and P<0.01respectively), decreased stress

  7. Bone marrow-derived mesenchymal stem cells protect against experimental liver fibrosis in rats

    Institute of Scientific and Technical Information of China (English)

    Dong-Chang Zhao; Jun-Xia Lei; Rui Chen; Wei-Hua Yu; Xiu-Ming Zhang; Shu-Nong Li; Peng Xiang

    2005-01-01

    AIM: Recent reports have shown the capacity of mesenchymal stem cells (MSCs) to differentiate into hepatocytes in vitro and in vivo. MSCs administration could repair injured liver, lung, or heart through reducing inflammation, collagen deposition, and remodeling. These results provide a clue to treatment of liver fibrosis. The aim of this study was to investigate the effect of infusion of bone marrow (BM)-derived MSCs on the experimental liver fibrosis in rats.METHODS: MSCs isolated from BM in male Fischer 344 rats were infused to female Wistar rats induced with carbon tetrachloride (CCl4) or dimethylnitrosamine (DMN).There were two random groups on the 42nd d of CCl4:CCl4/MSCs, to infuse a dose of MSCs alone; CCl4/saline,to infuse the same volume of saline as control. There were another three random groups after exposure to DMN: DMN10/MSCs, to infuse the same dose of MSCs on d 10; DMN10/saline, to infuse the same volume of saline on d 10; DMN20/MSCs, to infuse the same dose of MSCson d 20. The morphological and behavioral changes ofrats were monitored everyday. After 4-6 wk of MSCs administration, all rats were killed and fibrosis index were assessed by histopathology and radioimmunoassay. Smooth muscle alpha-actin (alpha-SMA) of liver were tested by immunohistochemistry and quantified by IBAS 2.5 software. Male rats sex determination region on the Y chromosome (sry) gene were explored by PCR.RESULTS: Compared to controls, infusion of MSCsreduced the mortality rates of incidence in CCl4-induced model (10% vs 20%) and in DMN-induced model (2040% vs 90%).The amount of collagen deposition and alpha-SMA staining was about 40-50% lower in liver of rats with MSCs than that of rats without MSCs. The similar results were observed in fibrosis index. And the effect of the inhibition of fibrogenesis was greater in DMN10/MSCs than in DMN20/MSCs. The sry gene was positive in the liver of rats with MSCs treatment by PCR.CONCLUSION: MSCs treatment can protect against

  8. Rice endosperm protein slows progression of fatty liver and diabetic nephropathy in Zucker diabetic fatty rats.

    Science.gov (United States)

    Kubota, Masatoshi; Watanabe, Reiko; Yamaguchi, Miki; Hosojima, Michihiro; Saito, Akihiko; Fujii, Mikio; Fujimura, Shinobu; Kadowaki, Motoni

    2016-10-01

    We previously reported that rice endosperm protein (REP) has renoprotective effects in Goto-Kakizaki rats, a non-obese diabetic model. However, whether these effects occur in obese diabetes remains unclear. This study aimed to clarify the effects of REP on obese diabetes, especially on fatty liver and diabetic nephropathy, using the obese diabetic model Zucker diabetic fatty (ZDF) rats. In total, 7-week-old male ZDF rats were fed diets containing 20 % REP or casein (C) for 8 weeks. Changes in fasting blood glucose levels and urinary markers were monitored during the experimental period. Hepatic lipids and metabolites were measured and renal glomeruli were observed morphologically. HbA1c levels were significantly lower in rats fed REP, compared with C (Pdiabetes, fatty liver and diabetic nephropathy.

  9. Comparative Study on the Effects of Serf-made Liver Preservation Solution on Secretion of ICAM-1 and NO in Rats

    Institute of Scientific and Technical Information of China (English)

    Shiming WANG; Peng DAI; Jun XU; Zheng YANG

    2008-01-01

    In order to study the effect of self-made liver preservation solution on liver preservation by comparing with UW solution and HC-A solution, the self-made liver preservation solution (SM) and perfusion solution were prepared under the aseptic conditions. The isolated non-circulated perfu-sion rat liver model was established. According to the different preservation solutions, the rats were randomly divided into UW group, SM group and HC-A group. The three groups were divided into 6subgroups according to the preservation duration (n=6 in each group). The transferase in liver perfu-sion solution and intercellular adhesion molecule-1 (ICAM-1) and nitric oxide (NO) in liver tissues were determined at 2, 8 and 24 h respectively. The results showed that the levels of alanine aml- notransferase (ALT) and aspartate aminotransferase (AST) had no significant difference between SM group and UW group, but significantly lower than in HC-A group. The levels of ICAM-1 and NO were increased simultaneously in SM group and UW group (P>0.05), but there was significant dif-ference as compared with HC-A group (P<0.05). At the same time point, the level of ICAM-1 was higher in SM group than in UW group, but NO was lower. The preservation effect of SM solution is the same as UW solution, but better than HC-A solution.

  10. Reciprocal Effects of Dietary Sesamin on Ketogenesis and Triacylglycerol Secretion by the Rat Liver

    OpenAIRE

    Fukuda, Nobuhiro; Miyagi, Chika; Zhang, Lei; Jayasooriya, Anura P.; Sakono, Masanobu; Yamamoto, Kyosuke; Ide, Takashi; Sugano, Michihiro

    1998-01-01

    The effects of dietary sesamin (a mixture of sesamin and episesamin, 1:1, w/w) on ketone body production and lipid secretion were studied in isolated perfused liver from rats given sesamin. Feeding sesamin at the dietary level of 0.2% from 14 to 16 d resulted in an enlargement of liver weight. Ketone body production was significantly elevated in the livers perfused with oleic acid in comparison with those perfused without an exogenous-free fatty acid, and sesamin feeding caused a stimulation ...

  11. The influence of vitamin E supplementation on the oxidative status of rat liver

    Directory of Open Access Journals (Sweden)

    Đurašević S.F.

    2010-01-01

    Full Text Available We tested to see if the additional intake of vitamin E in the form of α-tocopheryl-succinate would improve liver antioxidative protection. Thus, we studied the tissue oxidative status in rats supplemented by two doses of the antioxidant over a four week period of time. Our results confirmed that the additional intake of vitamin E decreased the liver lipid peroxidation level and SOD activity level and preserved its vitamin C content. However, the hydrogen peroxide content and catalase activity remained unchanged, probably due to the mechanism of vitamin E liver metabolism. .

  12. Does exercise training prior to ovariectomy protect against liver and adipocyte fat accumulation in rats?

    Science.gov (United States)

    Pighon, A; Barsalani, R; Yasari, S; Prud'homme, D; Lavoie, J-M

    2010-06-01

    To determine whether a training state protects against the metabolically deleterious effects of ovariectomy on liver and adipocyte fat accumulation in rats. Female rats were randomly assigned to each group (n = 8 rats/group). The animals were first either exercise-trained (Tr) for 6 weeks or kept sedentary (Sed) before being sham-operated (Sham), ovariectomized (Ovx), or ovariectomized with 17beta-estradiol supplementation (OvxE2). Following surgery, sedentary rats either remained sedentary (Sed-Sed) or undertook exercise training for 6 weeks (Sed-Tr) while exercise-trained rats either became sedentary (Tr-Sed) or resumed exercise training (Tr-Tr). Body weight and energy intake along with intra-abdominal and subcutaneous fat pad weights and homeostasis model assessment of insulin resistance (HOMA-IR) were significantly (p effect of a previous exercise-trained state. On the other hand, training conducted after surgery resulted in a lowering of fat mass and HOMA-IR whether rats had been trained or not before surgery (Sed-Tr and Tr-Tr), indicating the effectiveness of exercise training even initiated after surgery. These responses were independent of surgery. Interestingly, liver triacylglycerol concentrations followed a pattern of responses identical to fat mass with the exception that all of the responses were observed only in the Ovx group (p effect of a previous exercise-training state on ovariectomy-induced liver and adipocyte fat accumulation if rats remain sedentary after ovariectomy. However, training conducted concurrently with estrogen withdrawal has protective effects, especially on liver fat accumulation, whether or not rats were previously trained.

  13. Safety evaluation of mercury based Ayurvedic formulation (Sidh Makardhwaj) on brain cerebrum, liver & kidney in rats

    OpenAIRE

    Gajendra Kumar; Amita Srivastava; Surinder Kumar Sharma; Yogendra Kumar Gupta

    2014-01-01

    Background & objectives: Sidh Makardhwaj (SM) is a mercury based Ayurvedic formulation used in rheumatoid arthritis and neurological disorders. However, toxicity concerns due to mercury content are often raised. Therefore, the present study was carried out to evaluate the effect of SM on brain cerebrum, liver and kidney in rats. Methods: Graded doses of SM (10, 50, 100 mg/kg), mercuric chloride (1 mg/kg) and normal saline were administered orally to male Wistar rats for 28 days. Behaviou...

  14. Protective role of erdosteine on vancomycin-induced oxidative stress in rat liver.

    Science.gov (United States)

    Sahin, Mehmet; Cam, Hakan; Olgar, Seref; Tunc, Sevket Ercan; Arslan, Cagatay; Uz, Efkan; Yilmaz, H Ramazan

    2006-10-01

    Drug-induced liver toxicity is a common cause of liver injury. This study was designed to elucidate whether high dose vancomycin (VCM) induces oxidative stress in liver and to investigate the protective effects of erdosteine, an expectorant agent. Twenty-two young Wistar rats were divided into three groups as follows: control group, VCM, and VCM plus erdosteine. VCM was administered intraperitoneally in the dosage of 200 mg/kg twice daily for 7 days. Erdosteine was administered orally administered once a day at a dose of 10 mg/kg body weight. The activities of antioxidant enzymes such as superoxide dismutase and catalase as well as the concentration of malondialdehyde, as an indicator of lipid peroxidation, were measured to evaluate oxidative stress in homogenates of the liver. VCM administration increased malondialdehyde levels (p Erdosteine co-administration with VCM injections caused significantly decreased malondialdehyde levels (p erdosteine may prevent VCM-induced oxidative changes in liver by reducing reactive oxygen species.

  15. Effects of quercetin on polychlorinated biphenyls-induced liver injury in rats

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    Cléia Rocha de Oliveira

    2014-05-01

    Full Text Available Introduction: Polychlorinated biphenyls (PCBs, used as pesticides in agriculture, can lead to irreversible injuries in living organisms, particularly in liver. Oxidative stress has been implicated in the liver pathogenesis induced by different molecules, including PCBs. It has been demonstrated that quercetin, an antioxidant flavonoid found in the diet, exhibits a potent antioxidant effect in different liver pathologies. Objective: To evaluate oxidative stress caused by PCBs in liver and the antioxidant activity of quercetin. Methodology: We used male Wistar rats (n = 36, divided in 4 groups: control, quercetin (50 mg/kg/day, PCBs (0.4 ml/kg/day, and rats treated with both PCBs and quercetin. On day 25 blood was collected to assess liver integrity (enzymes AST, ALT and ALP, and liver samples to measure oxidative stress (TBARS, activity of antioxidant enzymes (SOD, CAT, GPx and DNA damage (micronucleus assay, and histological damage. Results: TBARS concentration and SOD activity were significantly higher in PCBs animals as compared to the PCB group receiving quercetin. CAT and GPx decreased in PCBs and increased when quercetin was added. The histological analysis showed damage to hepatocytes in PCBs, but quercetin was able to afford protection against such damage. The micronucleus test showed there was an increase in the production of microclenucleus compared to control, and quercetin was able to reduce this effect. Conclusion: Contamination with PCBs led to increased lipid peroxidation and DNA damage, and the use of antioxidant quercetin was effective in reducing PCBs-induced liver injury.

  16. Food-anticipatory activity and liver per1-luc activity in diabetic transgenic rats

    Science.gov (United States)

    Davidson, Alec J.; Stokkan, Karl-Arne; Yamazaki, Shin; Menaker, Michael

    2002-01-01

    The mammalian Per1 gene is an important component of the core cellular clock mechanism responsible for circadian rhythms. The rodent liver and other tissues rhythmically express Per1 in vitro but typically damp out within a few cycles. In the liver, the peak of this rhythm occurs in the late subjective night in an ad lib-fed rat, but will show a large phase advance in response to restricted availability of food during the day. The relationship between this shift in the liver clock and food-anticipatory activity (FAA), the circadian behavior entrained by daily feeding, is currently unknown. Insulin is released during feeding in mammals and could serve as an entraining signal to the liver. To test the role of insulin in the shift in liver Per1 expression and the generation of FAA, per-luciferase transgenic rats were made diabetic with a single injection of streptozotocine. Following 1 week of restricted feeding and locomotor activity monitoring, liver was collected for per-luc recording. In two separate experiments, FAA emerged and liver Per1 phase-shifted in response to daytime 8-h food restriction. The results rule out insulin as a necessary component of this system.

  17. Surface proteins in normal and transformed rat liver epithelial cells in culture.

    Science.gov (United States)

    Bannikov, G. A.; Saint Vincent, L.; Montesano, R.

    1980-01-01

    The pattern of surface proteins of different types of normal and transformed rat liver cells have been studied in culture by means of lactoperoxidase-catalysed iodination procedures, followed by SDS-gel electrophoresis. The cells examined were primary cultures of epithelial liver cells, long-term cultures of epithelial liver cells, in vitro transformed epithelial liver cell lines and liver tumour-cell lines; mesenchymal cells from liver and skin were also examined. The principal surface proteins of primary cultures of epithelial cells from adult or neonatal rats had components with mol. wts of 140,000-160,000, 100,000 and 40,000-70,000. A band that had the same position as fibronectin from mesenchymal cells was also present and this band, as well as other iodinated components, were less sensitive to trypsin than fibroblastic fibronectin. A similar pattern of iodinated proteins was seen in long-term cultures of epithelial liver cells, with a great reduction in the number and intensity of the bands in the mol. wt region below 100,000. Almost all the in vitro transformed and tumour epithelial cell lines contain a protein with a mol. wt 135,000 as one of the major iodinated bands, and in contrast to the observation in transformed fibroblasts, the fibronectin was retained by most of these transformed cell lines. Images Fig. 1 Fig. 2 Fig. 3 PMID:7053205

  18. Liver regeneration with l-glutamine supplemented diet: experimental study in rats

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    Cibelle Ribeiro Magalhães

    2014-04-01

    Full Text Available OBJECTIVE: To assess liver regeneration in rats after 60% hepatectomy with and without supplementation of L-glutamine through liver weight changes, laboratory parameters and histological study. METHODS: 36 male rats were divided into two groups: glutamine group and control group. Each group was subdivided into three subgroups, with death in 24h, 72h and seven days. The glutamine group received water and standard diet supplemented with L-glutamine, and the control recieved 0.9% saline. In all subgroups analysis of liver regeneration was made by the Kwon formula, study of liver function (AST, ALT, GGT, total bilirubin, indirect and indirect bilirubin and albumin and analysis of cell mitosis by hematoxylin-eosin. RESULTS: In both groups there was liver regeneration by weight gain. Gamma-GT increased significantly in the control group (p < 0.05; albumin increased in the glutamine group. The other indicators of liver function showed no significant differences. Histological analysis at 72h showed a higher number of mitoses in the glutamine group, with no differences in other subgroups. CONCLUSION: Diet supplementation with L glutamine is beneficial for liver regeneration.

  19. Fractionation of human liver mitochondria: enzymic and morphological characterization of the inner and outer membranes as compared to rat liver mitochondria.

    Science.gov (United States)

    Benga, G; Hodarnau, A; Tilinca, R; Porutiu, D; Dancea, S; Pop, V; Wrigglesworth, J

    1979-02-01

    The fractionation of human liver mitochondria into inner membrane, outer membrane and matrix material is reported. Compared with rat, human liver mitochondria are more fragile. Fractionation can be achieved in only 2 steps, a digitonin treatment for removal of the outer membrane and centrifugation of the inner membrane plus matrix particles through a linear sucrose gradient resulting in purified inner membranes and matrix.

  20. The Effect of Seaweed Eucheuma cottonii on Superoxide Dismutase (SOD Liver of Hypercholesterolemic Rats

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    TUTIK WRESDIYATI

    2008-09-01

    Full Text Available Intracellular antioxidant superoxide dismutase (SOD was reported decreased in the liver and kidney of hypercholesterolemic rats. This study was conducted to observe the effect of seaweed Eucheuma cottonii powder on the profile of blood cholesterol and the level of SOD in liver tissues of hypercholesterolemic rats by using immunohistochemical technique. Twenty male Wistar rats were used for this study. Those rats were divided into four groups; (i negative control group (A, (ii hypercholesterolemia group treated by 5% seaweed powder (B, (iii hypercholesterolemia group treated by 10% seaweed powder (C, and (iv Positive control group or hypercholesterolemia group (D. The experiment was carried out for 35 days. Hypercholesterolemia condition (> 130 mg/dl, except group A, was achieved by feeding the rats with commercial diet containing 1% cholesterol. Drinking water was given ad libitum for 40 days. The results showed that seaweed powder decreased the total cholesterol, low density lipoprotein (LDL, triglyceride, and increased the level of high density lipoprotein (HDL and SOD status in the liver tissues of hypercholesterolemic rats. The treatment of 10% seaweed powder gave better results than that of 5%. These results suggested that dietary fiber such in the seaweed powder has antioxidant activity.

  1. Lipid composition of liver in rats fed diets supplemented with egg yolks of modified composition

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    Hodžić Aida

    2012-01-01

    Full Text Available The aim of this study was to examine the effects of diets supplemented with egg yolks of modified composition on the fatty-acid composition and lipid content in rat’s liver. During four weeks of the experiment 64 Wistar rats were divided into four groups of 16 individuals each (eight individuals of both sexes and fed a commercial feed mixture for rats (group C or diet containing 70% commercial mixture for rats and 30% freshly cooked egg yolks from laying hens fed diets with 3% fish oil (group F, 3% palm olein (group P or 3% lard (group L. Dietary supplementation with egg yolks significantly increased the hepatic cholesterol pool in rats, regardless of the type of fat in the diet of laying hens from which the eggs originated. The content of α-linolenic acid in the liver of male rats in group P was 4-6 times higher compared to males in the other groups. Liver lipids and their fatty-acid composition differ by both, sex and dietary modified egg yolk composition in rats.

  2. Failure of P-selectin blockade alone to protect the liver from ischemia-reperfusion injury in the isolated blood-perfused rat liver

    Institute of Scientific and Technical Information of China (English)

    Samuel Wyllie; Neal R Barshes; Feng-Qin Gao; Saul J Karpen; John A Goss

    2008-01-01

    AIM: To determine if blockade of P-selectin in the isolated blood-perfused cold ex vivo rat liver model protects the liver from ischemia-reperfusion injury. METHODS: The effect of P-selectin blockade was assessed by employing an isolated blood-perfused cold ex vivo rat liver with or without P-selectin antibody treatment before and after 6 h of cold storage in University of Wisconsin solution.RESULTS: In our isolated blood-perfused rat liver model, pre-treatment with P-selectin antibody failed to protect the liver from ischemia-reperfusion injury, as judged by the elevated aspartate aminotransferase activity. In addition, P-selectin antibody treatment did not significantly reduced hepatic polymorphonuclear leukocyte accumulation after 120 min of perfusion. Histological evaluation of liver sections obtained at 120 min of perfusion showed significant oncotic necrosis in liver sections of both ischemic control and P-selectin antibody-treated groups. However, total bile production after 120 min of perfusion was significantly greater in P-selectin antibody-treated livers, compared to control livers. No significant difference in P-selectin and ICAM-1 mRNAs and proteins, GSH, GSSG, and nuclear NF-κB was found between control and P-selectin antibody-treated livers.CONCLUSION: In conclusion, we have shown that blockade of P-selectin alone failed to reduced polymorphonuclear leukocyte accumulation in the liver and protect hepatocytes from ischemia-reperfusion injury in the isolated blood-perfused cold-ex vivo rat liver model.

  3. Effect of Oenanthe Javanica Extract on Antioxidant Enzyme in the Rat Liver

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    Choong-Hyun Lee

    2015-01-01

    Full Text Available Background: Oenanthe javanica (O. javanica has been known to have high antioxidant properties via scavenging reactive oxygen species. We examined the effect of O. javanica extract (OJE on antioxidant enzymes in the rat liver. Methods: We examined the effect of the OJE on copper, zinc-superoxide dismutase (SOD1, manganese superoxide dismutase (SOD2, catalase (CAT, and glutathione peroxidase (GPx in the rat liver using immunohistochemistry and western blot analysis. Sprague-Dawley rats were randomly assigned to three groups; (1 normal diet fed group (normal-group, (2 diet containing ascorbic acid (AA-fed group (AA-group as a positive control, (3 diet containing OJE-fed group (OJE-group. Results: In this study, no histopathological finding in the rat liver was found in all the experimental groups. Numbers of SOD1, SOD2, CAT, and GPx immunoreactive cells and their protein levels were significantly increased in the AA-fed group compared with those in the normal-group. On the other hand, in the OJE-group, numbers of SOD1, SOD2, CAT, and GPx immunoreactive cells in the liver were significantly increased by about 190%, 478%, 685%, and 346%, respectively, compared with those in the AA-group. In addition, protein levels of SOD1, SOD2, CAT, and GPx in the OJE-group were also significantly much higher than those in the AA-group. Conclusion: OJE significantly increased expressions of SOD1 and SOD2, CAT, and GPx in the liver cells of the rat, and these suggests that significant enhancements of endogenous enzymatic antioxidants by OJE might be a legitimate strategy for decreasing oxidative stresses in the liver.

  4. Effect of endurance swimming training during pregnancy on histology and apoptotic index of rats\\' liver

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    Shadmehr Mirdar Harijani

    2015-04-01

    Full Text Available Background: The studies have reported that exercise induced apoptosis in various tissues. The abnormal regulation of apoptosis contributes to the progression of pathological processes in the placenta and effects on embryo development. The aim of the present study was to investigate the effect of swimming endurance training during pregnancy on apoptosis induction in pregnant rats' liver. Materials and Methods:: Sixteen female Wistar rats with an average weight of 200 ± 20 grams were divided into two groups: swimming and control. The rats of training group were forced from first day of pregnancy to delivery in a particular pool. The time of training in first day of pregnancy was 10 min and this time in second week reached to 60 min by increasing of 5 min per day. The time of 60 min continued to end of third week. The sampling of the rats' liver was performed two days after delivery and the liver apoptotic index was determined with TUNEL technique. Statistical analysis of the data was done using independent t-test (α≤ 0.05. Results: The results of study showed that swimming endurance training did not induce significant change in liver apoptosis (p < 0.424. The mean of apoptosis in control and training groups was %7.40 and %8.60 respectively. But 3-wk period of swimming training induced significantly minor increase in the amount of post pregnancy weight gain compared to the control group (p < 0.001. In addition, it was observed non-significant decrease in weight of training groups rat's liver compared to the control group (p = 1.00. Conclusion: It seems that endurance swimming training during pregnancy has no anguishing effect on apoptosis induction in liver and it is considered as safe exercise way in the improvement of mother and infant health.

  5. Interaction between nanoparticles generated by zinc chloride treatment and oxidative responses in rat liver

    Directory of Open Access Journals (Sweden)

    Azzouz I

    2013-12-01

    Full Text Available Inès Azzouz, Hamdi Trabelsi, Amel Hanini, Soumaya Ferchichi, Olfa Tebourbi, Mohsen Sakly, Hafedh AbdelmelekLaboratory of Integrative Physiology, Faculty of Sciences of Bizerte, Carthage University, TunisiaAbstract: The aim of the present study was to investigate the interaction of zinc chloride (3 mg/kg, intraperitoneally [ip] in rat liver in terms of the biosynthesis of nanoparticles. Zinc treatment increased zinc content in rat liver. Analysis of fluorescence revealed the presence of red fluorescence in the liver following zinc treatment. Interestingly, the co-exposure to zinc (3 mg/kg, ip and selenium (0.20 mg/L, per os [by mouth] led to a higher intensity of red fluorescence compared to zinc-treated rats. In addition, X-ray diffraction measurements carried out on liver fractions of zinc-treated rats point to the biosynthesis of zinc sulfide and/or selenide nanocomplexes at nearly 51.60 nm in size. Moreover, co-exposure led to nanocomplexes of about 72.60 nm in size. The interaction of zinc with other mineral elements (S, Se generates several nanocomplexes, such as ZnS and/or ZnSe. The nanocomplex ZnX could interact directly with enzyme activity or indirectly by the disruption of mineral elements' bioavailability in cells. Subacute zinc or selenium treatment decreased malondialdehyde levels, indicating a drop in lipid peroxidation. In addition, antioxidant enzyme assays showed that treatment with zinc or co-treatment with zinc and selenium increased the activities of glutathione peroxidase, catalase, and superoxide dismutase. Consequently, zinc complexation with sulfur and/or selenium at nanoscale level could enhance antioxidative responses, which is correlated to the ratio of number of ZnX nanoparticles (X=sulfur or X=selenium to malondialdehyde level in rat liver.Keywords: nanocomplexes biosynthesis, antioxidative responses, X-ray diffraction, fluorescence microscopy, liver

  6. Effect of Oenanthe Javanica Extract on Antioxidant Enzyme in the Rat Liver

    Institute of Scientific and Technical Information of China (English)

    Choong-Hyun Lee; Joon-Ha Park; Jeong-Hwi Cho; In-Hye Kim; Ji-Hyeon Ahn; Jae-Chul Lee; Bai Hui Chen

    2015-01-01

    Background:Oenanthe javanica (O.javanica) has been known to have high antioxidant properties via scavenging reactive oxygen species.We examined the effect of O.javanica extract (OJE) on antioxidant enzymes in the rat liver.Methods:We examined the effect of the OJE on copper,zinc-superoxide dismutase (SOD1),manganese superoxide dismutase (SOD2),catalase (CAT),and glutathione peroxidase (GPx) in the rat liver using immunohistochemistry and western blot analysis.Sprague-Dawley rats were randomly assigned to three groups;(1) normal diet fed group (normal-group),(2) diet containing ascorbic acid (AA)-fed group (AA-group) as a positive control,(3) diet containing OJE-fed group (OJE-group).Results:In this study,no histopathological finding in the rat liver was found in all the experimental groups.Numbers of SOD1,SOD2,CAT,and GPx immunoreactive cells and their protein levels were significantly increased in the AA-fed group compared with those in the normal-group.On the other hand,in the OJE-group,numbers of SOD1,SOD2,CAT,and GPx immunoreactive cells in the liver were significantly increased by about 190%,478%,685%,and 346%,respectively,compared with those in the AA-group.In addition,protein levels of SOD 1,SOD2,CAT,and GPx in the OJE-group were also significantly much higher than those in the AA-group.Conclusion:OJE significantly increased expressions of SOD 1 and SOD2,CAT,and GPx in the liver cells of the rat,and these suggests that significant enhancements of endogenous enzymatic antioxidants by OJE might be a legitimate strategy for decreasing oxidative stresses in the liver.

  7. Convenient and efficient enrichment of the CD133+ liver cells from rat fetal liver cells as a source of liver stem/progenitor cells.

    Science.gov (United States)

    Liu, Wei-hui; Li, Ren; Dou, Ke-feng

    2011-03-01

    Although the stem cells are commonly isolated by FACS or MACS, they are very expensive and these is no specific marker for liver stem/progentior cells (LSPCs). This paper applied a convenient and efficient method to enrich LSPCs. The fetal liver cells (FLCs) were firstly enriched by Percoll discontinuous gradient centrifugation (PDGC) from the rat fetal liver. Then the FLCs in culture were purified to be homogeneous in size by differential trypsinization and differential adherence (DTDA). Flow cytometric analysis revealed more than half of the purified FLCs expressed alternative markers of LSPCs (CD117, c-Met, Sca-1, CD90, CD49f and CD133). In other words, the purified FLCs were heterogeneous. Therefore, they were sequentially layered into six fractions by Percoll continuous gradient centrifugation (PCGC). Both CD133 and CD49f expressed decreasingly from fraction 1 to 6. In fraction 1 and 2, about 85% FLCs expressed CD133, which were revealed to be LSPCs by high expressions of AFP and CK-19, low expressions of G-6-P and ALB. To conclude, the purity of CD133(+) LSPCs enriched by combination of PDGC, DTDA and PCGC is close to that obtained by MACS. This study will greatly contribute to two important biological aspects: liver stem cells isolation and liver cell therapy.

  8. Assessment of liver steatosis and fibrosis in rats using integrated coherent anti-Stokes Raman scattering and multiphoton imaging technique

    Science.gov (United States)

    Lin, Jian; Lu, Fake; Zheng, Wei; Xu, Shuoyu; Tai, Dean; Yu, Hanry; Huang, Zhiwei

    2011-11-01

    We report the implementation of a unique integrated coherent anti-Stokes Raman scattering (CARS), second-harmonic generation (SHG), and two-photon excitation fluorescence (TPEF) microscopy imaging technique developed for label-free monitoring of the progression of liver steatosis and fibrosis generated in a bile duct ligation (BDL) rat model. Among the 21 adult rats used in this study, 18 rats were performed with BDL surgery and sacrificed each week from weeks 1 to 6 (n = 3 per week), respectively; whereas 3 rats as control were sacrificed at week 0. Colocalized imaging of the aggregated hepatic fats, collagen fibrils, and hepatocyte morphologies in liver tissue is realized by using the integrated CARS, SHG, and TPEF technique. The results show that there are significant accumulations of hepatic lipid droplets and collagen fibrils associated with severe hepatocyte necrosis in BDL rat liver as compared to a normal liver tissue. The volume of normal hepatocytes keeps decreasing and the fiber collagen content in BDL rat liver follows a growing trend until week 6; whereas the hepatic fat content reaches a maximum in week 4 and then appears to stop growing in week 6, indicating that liver steatosis and fibrosis induced in a BDL rat liver model may develop at different rates. This work demonstrates that the integrated CARS and multiphoton microscopy imaging technique has the potential to provide an effective means for early diagnosis and detection of liver steatosis and fibrosis without labeling.

  9. Overexpression of angiopoietin-2 in rats and patients with liver fibrosis. Therapeutic consequences of its inhibition.

    Science.gov (United States)

    Pauta, Montse; Ribera, Jordi; Melgar-Lesmes, Pedro; Casals, Gregori; Rodríguez-Vita, Juan; Reichenbach, Vedrana; Fernandez-Varo, Guillermo; Morales-Romero, Blai; Bataller, Ramon; Michelena, Javier; Altamirano, Jose; Jiménez, Wladimiro; Morales-Ruiz, Manuel

    2015-04-01

    Studies in experimental models of cirrhosis showed that anti-angiogenic treatments may be effective for the treatment of liver fibrosis. In this context, angiopoietins are potential therapeutic targets as they are involved in the maintenance and stabilization of newly formed blood vessels. In addition, angiopoietin-2 is expressed in fibrotic livers and its inhibition in tumours results in vessel stability. Therefore, our study was aimed to assess the therapeutic utility of inhibiting angiopoietin-2. Circulating levels of angiopoietin-1 and angiopoietin-2 were quantified by ELISA in CCl4 -treated rats and in patients with cirrhosis. In vivo blockade of angiopoietin-2 in rats with liver fibrosis was performed with a chemically programmed antibody, CVX-060. High levels of angiopoietin-2 were found in the systemic and suprahepatic circulation of cirrhotic patients and the ratio angiopoietin-1/angiopoietin-2 inversely correlated with prognostic models for alcoholic liver disease. Chronic treatment of CCl4 -treated rats with CVX-060 was associated with a significant decrease in inflammatory infiltrate, normalization of the hepatic microvasculature and reduction in VCAM-1 vascular expression. The anti-angiopoietin-2 treatment was also associated with less liver fibrosis and with lower levels of circulating transaminases. CVX-060 treatment was not associated with either vascular pruning in healthy tissue or compensatory overexpression of VEGF. Inhibition of angiopoietin-2 is an effective and safe treatment for liver fibrosis in CCl4 -treated rats, acting mainly through the induction of vessel normalization and the attenuation of hepatic inflammatory infiltrate. Therefore, inhibition of angiopoietin-2 offers a therapeutic alternative for liver fibrosis. © 2014 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  10. Hepatoprotective efficacy of gallic acid during Nitrosodiethylamine-induced liver inflammation in Wistar rats

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    Uzma Latief

    2016-08-01

    Full Text Available Gallic acid (GA, a popular phenolic acid is found in gallnuts, grapes, pomegranates, tea and oak bark. It possesses anti-cancer, anti-bacterial, anti-depressant, anti-asthmatic and anti-obesity effects. N′-Nitrosodiethylamine (NDEA is a well-known hepatotoxin, carcinogen and mutagen. In this study, we have examined the hepatoprotective effect of gallic acid against liver inflammation induced by NDEA in Wistar rats. Hepatic damage in the animals was induced by 10 ml kg−1 b.wt of 1% NDEA (i.p. solution in normal saline once in a week. Another group received GA supplement (i.p. in 100 mg kg−1 b.wt wk−1. Animals belonging to control group were administered equal amounts of saline or GA. LPO, SOD and membrane-bound ATPase (Ca2+- and Mg2+-ATPase activities were determined in liver homogenate of control and treated rats. Alterations in liver architecture were assessed by H&E and Masson’s trichrome stainings of 5 μm thick liver sections. Immunohistochemistry (IHC was performed to localize the inflammatory marker, Cyclooxygenase-2 (COX-2. Our results demonstrate a significant increase in malondialdehyde, and decrease in SOD and ATPases (Ca2+/Mg2+ in NDEA-treated rats. Histopathology data showed inflammation, activated HSCs, deposition of collagen, periportal as well as bridging fibrosis in NDEA-treated liver specimens. Immunohistochemistry of NDEA-treated liver sections exhibited COX-2 positive cells. Gallic acid supplement revert the hepatic functioning in rats injured with NDEA probably by inducing Nrf2-mediated antioxidant enzymes and attenuating the inflammatory mediators COX-2 through NF-κB inhibition pathway. Therefore, gallic acid supplement may be a useful promising bioagent in combating liver injury.

  11. Bilirubin diglucuronide synthesis by a UDP-glucuronic acid-dependent enzyme system in rat liver microsomes.

    Science.gov (United States)

    Blanckaert, N; Gollan, J; Schmid, R

    1979-01-01

    Incubation of rat liver homogenate or microsomal preparations with bilirubin or bilirubin monoglucuronide with (BMG) resulted in formation of bilirubin diglucuronide (BDG). Both synthesis of BMG and its conversion to BDG were critically dependent on the presence of UDP-glucuronic acid. Pretreatment of the animals with phenobarbital stimulated both reactions. When 33 microM bilirubin was incubated with microsomal preparations from phenobarbital-treated rats, 80-90% of the substrate was converted to bilirubin glucuronides; the reaction products consisted of almost equal amounts of BMG and BDG. When phenobarbital pretreatment was omitted or when the substrate concentration was increased to 164 microM bilirubin, proportionally more BMG and less BDG were formed. Homogenate and microsomes from homozygous Gunn rats neither synthesized BMG nor converted BMG to BDG. These findings in vitro suggest an explanation for the observations in vivo that, in conditions of excess bilirubin load or of genetically decreased bilirubin UDP glucuronosyltransferase (EC 2.4.1.17) activity, proportionally more BMG and less BDG are excreted in bile. PMID:109837

  12. Effects of pharmacological serum from normal and liver fibrotic rats on HSCs

    Institute of Scientific and Technical Information of China (English)

    Xi-Xian Yao; Tao Lv

    2005-01-01

    AIM: To make drug sera of Salvia miltiorrhiza and Yigankang, both of which are Chinese herbs that activate bleeding and eliminate stasis, in normal rats and those with liver fibrosis, respectively. To investigate and compare the effects of the two different drug sera on the proliferation and activation of hepatic stellate cells (HSCs).METHODS: Some rats were induced with liver fibrosis:40% carbon tetrachloride (CCl4) subcutaneous injection,twice a week for 9 wk. Salvia miltiorrhiza, Yigankang,colchicines and normal saline were administered into the stomachs of normal rats and those with liver fibrosis.Drug sera were extracted 5 d later. HSCs in vitro were cultivated in different drug sera for 24 h. The rates of proliferation and expression of α-smooth muscle actin (α-SMA) were detected by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and immunocytochemistry stain, respectively.RESULTS: The drug sera from normal and liver fibrotic rats could be used to cultivate HSCs and to observe the effects of the corresponding components of herbs on HSCs. Salvia miltiorrhiza and Yigankang had better inhibitory effects on HSCs than colchicines (MTT: normal drug serum: Salvia miltiorrhiza 0.42±0.08, Yigankang 0.32±0.10 vs colchicines 0.45±0.12 pathological drug serum: Salvia miltiorrhiza 0.33±0.02, Yigankang 0.26±0.01vs colchicines 0.41±0.09. P<0.05). The drug sera of Salvia miltiorrhiza, Yigankang from liver fibrotic rats had a stronger inhibitory effect than the same ones from normal rats (MTT: Salvia miltiorrhiza: normal drug serum 0.42±0.08 vs pathological drug serum 0.33±0.02. Yigankang: normal drug serum 0.32±0.10 vs pathological drug serum 0.26±0.01.P<0.05).CONCLUSION: Salvia miltiorrhiza and Yigankang could inhibit the expression of α-SMA and the proliferation of HSCs. The drug sera from normal and liver fibrotic rats had different effects on HSCs, probably due to different metabolic processes, effective components and different

  13. Formation of 4'-carboxyl acid metabolite of imrecoxib by rat liver microsomes

    Institute of Scientific and Technical Information of China (English)

    Hai-yan XU; Peng ZHANG; Ai-shen GONG; Yu-ming SUN; Feng-ming CHU; Zong-ru GUO; Da-fang ZHONG

    2006-01-01

    Aim:Imrecoxib is a novel and moderately selective COX-2 inhibitor.The aim of the present in vitro investigation was to study the formation of the major metabolite 4'-carboxylic acid imrecoxib (M2) and identify the enzyrne(s) involved in the reaction.Methods:The formation of M2 was studied in rat liver cytosol in the absence or presence of liver microsomes.The formed metabolite was identified and quantified by LC/MSn.In addition,to characterize the cytochrome P450 (CYP) isozymes involved in M2 formation,the effects of typical CYP inhibitors (such as ketoconazle,quinine,α-naphthoflavone, methylpyrazole,and cimetidine) on the formation rate of M2 were investigated.Results:The formation of M2 from 4'hydroxymethyl imrecoxib (M4) was completely dependent on rat liver microsomes and NADPH.Enzyme kinetic studies demonstrated that the formation rate of M2 conformed to monophasic Michaelis-Menten kinetics.Additional experiments showed that the formation of M2 was induced significantly by dexamethasone and lowered by ketoconazole strongly and concentration-dependently.By comparison.other CYP inhibitors.such as α-naphthoflavone,cimetidine,quinine,and methylpyrazole had no inhibitory effects on this metabolic pathway.Conclusion:These biotransformation studies of M4 and imrecoxib in rat liver at the subcellular level showed that the formation of M2 occurs in rat liver microsomes and is NADPH-dependent.The reaction was mainly catalyzed by CYP 3A in untreated rats and in dexamethasone-induced rats.Other CYP,such as CYP 1A,2C,2D,and 2E,seem unlikely to participate in this metabolic pathway.

  14. Transcriptome Analysis of the Effects of Gomisin A on the Recovery of Carbon Tetrachloride-Induced Damage in Rat Liver

    OpenAIRE

    Choi, Young Mi; Choi, In Soo; Lee, Sang Mong; Hwang, Dae Youn; Choi, Young Whan; Park, Young Hoon

    2011-01-01

    Gomisin A possesses a hepatic function-facilitating property in liver-injured rats. Its preventive action on carbon tetrachloride-induced cholestasis is due to maintenance of the function of the bile acids-independent fraction. To investigate alterations in gene expression after gomisin A treatment on injured rat liver, DNA microarray analyses were performed on a Rat 44K 4-Plex Gene Expression platform with duplicated reactions after gomisin A treatment. We identified 255 up-regulated and 230...

  15. DECREASED BILIRUBIN TRANSPORT IN THE PERFUSED LIVER OF ENDOTOXEMIC RATS

    NARCIS (Netherlands)

    ROELOFSEN, H; VANDERVEERE, CN; OTTENHOFF, R; SCHOEMAKER, B; JANSEN, PLM; ELFERINK, RPJO

    1994-01-01

    Background/Aims: Hyperbilirubinemia associated with sepsis is frequently observed in humans. In this study, an experimental rat model was developed to study bilirubin metabolism and transport during endotoxemia. Methods: Rats were injected intravenously with a single bolus of lipopolysaccharide (1 m

  16. Hepatoprotective effect of flavonol glycosides rich fraction from Egyptian Vicia calcarata Desf. against CCl4-induced liver damage in rats.

    Science.gov (United States)

    Singab, Abdel Nasser B; Youssef, Diaa T A; Noaman, Eman; Kotb, Saeed

    2005-07-01

    The hepatoprotective activity of flavonol glycosides rich fraction (F-2), prepared from 70% alcohol extract of the aerial parts of V. calcarata Desf., was evaluated in a rat model with a liver injury induced by daily oral administration of CCl4 (100 mg/kg, b.w) for four weeks. Treatment of the animals with F-2 using a dose of (25 mg/kg, b.w) during the induction of hepatic damage by CCl4 significantly reduced the indices of liver injuries. The hepatoprotective effects of F-2 significantly reduced the elevated levels of the following serum enzymes: alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP) and lactate dehydrogenase (LDH). The antioxidant activity of F-2 markedly ameliorated the antioxidant parameters including glutathione (GSH) content, glutathione peroxidase (GSH-Px), superoxide dismutase (SOD), plasma catalase (CAT) and packed erythrocytes glucose-6-phosphate dehydrogenase (G6PDH) to be comparable with normal control levels. In addition, it normalized liver malondialdehyde (MDA) levels and creatinine concentration. Chromatographic purification of F-2 resulted in the isolation of two flavonol glycosides that rarely occur in the plant kingdom, identified as quercetin-3, 5-di-O-beta-D-diglucoside (5) and kaempferol-3, 5-di-O-beta-D-diglucoside (4) in addition to the three known compounds identified as quercetin-3-O-alpha-L-rhamnosyl- (1-->6)-beta-D-glucoside [rutin, 3], quercetin-3-O-beta-D-glucoside [isoquercitrin, 2] and kaempferol-3-O-beta-D-glucoside [astragalin, 1]. These compounds were identified based on interpretation of their physical, chemical, and spectral data. Moreover, the spectrophotometric estimation of the flavonoids content revealed that the aerial parts of the plant contain an appreciable amount of flavonoids (0.89%) calculated as rutin. The data obtained from this study revealed that the flavonol glycosides of F-2 protect the rat liver from hepatic damage induced by CCl4 through inhibition of

  17. Differential metabolism of 4-hydroxynonenal in liver, lung and brain of mice and rats

    Energy Technology Data Exchange (ETDEWEB)

    Zheng, Ruijin; Dragomir, Ana-Cristina; Mishin, Vladimir [Pharmacology and Toxicology, Rutgers University-Ernest Mario School of Pharmacy, Piscataway, NJ (United States); Richardson, Jason R. [Environmental and Occupational Medicine, Rutgers University-Robert Wood Johnson Medical School, Piscataway, NJ (United States); Heck, Diane E. [Environmental Science, School of Health Sciences and Practice, New York Medical College, Valhalla, NY (United States); Laskin, Debra L. [Pharmacology and Toxicology, Rutgers University-Ernest Mario School of Pharmacy, Piscataway, NJ (United States); Laskin, Jeffrey D., E-mail: jlaskin@eohsi.rutgers.edu [Environmental and Occupational Medicine, Rutgers University-Robert Wood Johnson Medical School, Piscataway, NJ (United States)

    2014-08-15

    The lipid peroxidation end-product 4-hydroxynonenal (4-HNE) is generated in tissues during oxidative stress. As a reactive aldehyde, it forms Michael adducts with nucleophiles, a process that disrupts cellular functioning. Liver, lung and brain are highly sensitive to xenobiotic-induced oxidative stress and readily generate 4-HNE. In the present studies, we compared 4-HNE metabolism in these tissues, a process that protects against tissue injury. 4-HNE was degraded slowly in total homogenates and S9 fractions of mouse liver, lung and brain. In liver, but not lung or brain, NAD(P)+ and NAD(P)H markedly stimulated 4-HNE metabolism. Similar results were observed in rat S9 fractions from these tissues. In liver, lung and brain S9 fractions, 4-HNE formed protein adducts. When NADH was used to stimulate 4-HNE metabolism, the formation of protein adducts was suppressed in liver, but not lung or brain. In both mouse and rat tissues, 4-HNE was also metabolized by glutathione S-transferases. The greatest activity was noted in livers of mice and in lungs of rats; relatively low glutathione S-transferase activity was detected in brain. In mouse hepatocytes, 4-HNE was rapidly taken up and metabolized. Simultaneously, 4-HNE-protein adducts were formed, suggesting that 4-HNE metabolism in intact cells does not prevent protein modifications. These data demonstrate that, in contrast to liver, lung and brain have a limited capacity to metabolize 4-HNE. The persistence of 4-HNE in these tissues may increase the likelihood of tissue injury during oxidative stress. - Highlights: • Lipid peroxidation generates 4-hydroxynonenal, a highly reactive aldehyde. • Rodent liver, but not lung or brain, is efficient in degrading 4-hydroxynonenal. • 4-hydroxynonenal persists in tissues with low metabolism, causing tissue damage.

  18. Safety evaluation of mercury based Ayurvedic formulation (Sidh Makardhwaj) on brain cerebrum, liver & kidney in rats.

    Science.gov (United States)

    Kumar, Gajendra; Srivastava, Amita; Sharma, Surinder Kumar; Gupta, Yogendra Kumar

    2014-04-01

    Sidh Makardhwaj (SM) is a mercury based Ayurvedic formulation used in rheumatoid arthritis and neurological disorders. However, toxicity concerns due to mercury content are often raised. Therefore, the present study was carried out to evaluate the effect of SM on brain cerebrum, liver and kidney in rats. Graded doses of SM (10, 50, 100 mg/kg), mercuric chloride (1 mg/kg) and normal saline were administered orally to male Wistar rats for 28 days. Behavioural parameters were assessed on days 1, 7, 14 and 28 using Morris water maze, passive avoidance, elevated plus maze and rota rod. Liver and kidney function tests were done on day 28. Animals were sacrificed and brain cerebrum acetylcholinesterase activity, levels of malondialdehyde (MDA), reduced glutathione (GSH) in brain cerebrum, liver, kidney were estimated. The levels of mercury in brain cerebrum, liver and kidney were estimated and histopathology of these tissues was also performed. SM in the doses used did not cause significant change in neurobehavioural parameters, brain cerebrum AChE activity, liver (ALT, AST, ALP bilirubin) and kidney (serum urea and creatinine) function tests as compared to control. The levels of mercury in brain cerebrum, liver, and kidney were found to be raised in dose dependent manner. However, the levels of MDA and GSH in these tissues did not show significant changes at doses of 10 and 50 mg/kg. Also, there was no histopathological change in cytoarchitecture of brain cerebrum, liver, and kidney tissues at doses of 10 and 50 mg/kg. The findings of the present study suggest that Sidh Makardhwaj upto five times the equivalent human dose administered for 28 days did not show any toxicological effects on rat brain cerebrum, liver and kidney.

  19. Safety evaluation of mercury based Ayurvedic formulation (Sidh Makardhwaj on brain cerebrum, liver & kidney in rats

    Directory of Open Access Journals (Sweden)

    Gajendra Kumar

    2014-01-01

    Full Text Available Background & objectives: Sidh Makardhwaj (SM is a mercury based Ayurvedic formulation used in rheumatoid arthritis and neurological disorders. However, toxicity concerns due to mercury content are often raised. Therefore, the present study was carried out to evaluate the effect of SM on brain cerebrum, liver and kidney in rats. Methods: Graded doses of SM (10, 50, 100 mg/kg, mercuric chloride (1 mg/kg and normal saline were administered orally to male Wistar rats for 28 days. Behavioural parameters were assessed on days 1, 7, 14 and 28 using Morris water maze, passive avoidance, elevated plus maze and rota rod. Liver and kidney function tests were done on day 28. Animals were sacrificed and brain cerebrum acetylcholinesterase activity, levels of malondialdehyde (MDA, reduced glutathione (GSH in brain cerebrum, liver, kidney were estimated. The levels of mercury in brain cerebrum, liver and kidney were estimated and histopathology of these tissues was also performed. Results: SM in the doses used did not cause significant change in neurobehavioural parameters, brain cerebrum AChE activity, liver (ALT, AST, ALP bilirubin and kidney (serum urea and creatinine function tests as compared to control. The levels of mercury in brain cerebrum, liver, and kidney were found to be raised in dose dependent manner. However, the levels of MDA and GSH in these tissues did not show significant changes at doses of 10 and 50 mg/kg. Also, there was no histopathological change in cytoarchitecture of brain cerebrum, liver, and kidney tissues at doses of 10 and 50 mg/kg. Interpretation & conclusions: The findings of the present study suggest that Sidh Makardhwaj upto five times the equivalent human dose administered for 28 days did not show any toxicological effects on rat brain cerebrum, liver and kidney.

  20. Effect of Oyster mushroom in Paracetamol Induced Toxicity of Liver in Wistar albino Rats

    Directory of Open Access Journals (Sweden)

    Afroza Khanam Sumy

    2014-09-01

    Full Text Available Backgroud: Liver is an important metabolic organ. It has wide range of functions including detoxification, storage of glycogen, vitamins A, D and B12, production of several coagulation factors, growth factors such as insulin-like growth factor-1 (IGF-1, angiotensinogen, and biochemicals necessary for digestion (bile. Its damage occurs due to its multidimensional functions, various xenobiotics and oxidative stress leading to distortion of all of its functions. Oyster mushroom which is excellently edible and nutritious has got free radical scavenging activity, and so may be considered as a hepatoprotective agent. Objective: To observe the hepatoprotective effect of Oyster mushroom (Pleurotus florida against paracetamol induced liver damage in Wistar albino rats. Materials and Methods: This experimental study was carried out in the Department of Physiology, Sir Salimullah Medical College (SSMC, Dhaka from 1st July 2009 to 30th June 2010. Thirty four Wistar albino rats, aged 90 to 120 days, weighing between 150 to 210 grams were used for the study. After acclimatization for 14 days, they were divided into two groups –– control group (Group A and experimental group (Group B, mushroom-pretreated and paracetamol-treated group. Control group was again subdivided into Group A1 (baseline control group and Group A2 (paracetamol-treated control group. Animals of all groups received basal diet for 30 consecutive days. In addition, Group A1 rats received propylene glycol (2 mL/kg body weight orally only on 30th day, Group A2 rats received single dose of paracetamol suspension (750 mg/kg body weight orally only on 30th day and Group B rats received mushroom extract (200 mg/kg body weight orally for 30 consecutive days and paracetamol suspension (750 mg/kg body weight orally only on 30th day. All the animals were sacrificed on 31st day. Then liver specimens were collected. Histology of liver was done by using standard laboratory procedure. Statistical

  1. Monounsaturated fat decreases hepatic lipid content in non-alcoholic fatty liver disease in rats

    Institute of Scientific and Technical Information of China (English)

    Osamah Hussein; Masha Grosovski; Etti Lasri; Sergio Svalb; Uzi Ravid; Nimer Assy

    2007-01-01

    AIM: To evaluate the effects of different types of dietary fats on the hepatic lipid content and oxidative stress parameters in rat liver with experimental non-alcoholic fatty liver disease (NAFLD).METHODS: A total of 32 Sprague-Dawley rats were randomly divided into five groups. The rats in the control group (n = 8) were on chow diet (Group 1), rats (n =6) on methionine choline-deficient diet (MCDD) (Group 2), rats (n = 6) on MCDD enriched with olive oil (Group 3), rats (n = 6) on MCDD with fish oil (Group 4) and rats (n = 6) on MCDD with butter fat (Group 5). After 2 mo, blood and liver sections were examined for lipids composition and oxidative stress parameters.RESULTS: The liver weight/rat weight ratio increased in all treatment groups as compared with the control group. Severe fatty liver was seen in MCDD + fish oil and in MCDD + butter fat groups, but not in MCDD and MCDD + olive oil groups. The increase in hepatic triglycerides (TG) levels was blunted by 30% in MCDD+ olive oil group (0.59 ± 0.09) compared with MCDD group (0.85 ± 0.04, P < 0.004), by 37% compared with MCDD + fish oil group (0.95±0.07, P < 0.001), and by 33% compared with MCDD + butter group (0.09±0.1,P < 0.01). The increase in serum TG was lowered by10% in MCDD + olive oil group (0.9 ± 0.07) compared with MCDD group (1.05 ± 0.06). Hepatic cholesterol increased by 15-fold in MCDD group [(0.08 ± 0.02, this increment was blunted by 21% in MCDD + fish oil group(0.09 ± 0.02)]. In comparison with the control group,ratio of long-chain polyunsaturated fatty acids omega-6/omega-3 increased in MCDD + olive oil, MCDD + fish oil and MCDD + butter fat groups by 345-, 30- and 397-fold, respectively. In comparison to MCDD group(1.58±0.08), hepatic MDA contents in MCDD + olive oil(3.3±0.6), MCDD + fish oil (3.0±0.4), and MCDD +butter group (2.9±0.36) were increased by 108%, 91%and 87%, respectively (P < 0.004). Hepatic paraoxonase activity decreased significantly in all treatment groups

  2. Pulpal responses to cavity preparation in aged rat molars.

    Science.gov (United States)

    Kawagishi, Eriko; Nakakura-Ohshima, Kuniko; Nomura, Shuichi; Ohshima, Hayato

    2006-10-01

    The dentin-pulp complex is capable of repair after tooth injuries including dental procedures. However, few data are available concerning aged changes in pulpal reactions to such injuries. The present study aimed to clarify the capability of defense in aged pulp by investigating the responses of odontoblasts and cells positive for class II major histocompatibility complex (MHC) to cavity preparation in aged rat molars (300-360 days) and by comparing the results with those in young adult rats (100 days). In untreated control teeth, immunoreactivity for intense heat-shock protein (HSP)-25 and nestin was found in odontoblasts, whereas class-II-MHC-positive cells were densely distributed in the periphery of the pulp. Cavity preparation caused two types of pulpal reactions based on the different extent of damage in the aged rats. In the case of severe damage, destruction of the odontoblast layer was conspicuous at the affected site. By 12 h after cavity preparation, numerous class-II-MHC-positive cells appeared along the pulp-dentin border but subsequently disappeared together with HSP-25-immunopositive cells, and finally newly differentiated odontoblast-like cells took the place of the degenerated odontoblasts and acquired immunoreactivity for HSP-25 and nestin by postoperative day 3. In the case of mild damage, no remarkable changes occurred in odontoblasts after operation, and some survived through the experimental stages. These findings indicate that aged pulp tissue still possesses a defense capacity, and that a variety of reactions can occur depending on the difference in the status of dentinal tubules and/or odontoblast processes in individuals.

  3. Partial purification of the microsomal rat liver iodothyronine deiodinase. II. Affinity chromatography.

    Science.gov (United States)

    Mol, J A; van den Berg, T P; Visser, T J

    1988-02-01

    Iodothyronine deiodinase has been solubilized and purified approximately 2400 times from liver microsomal fractions of male Wistar rats pretreated with thyroxine. The deiodinase was solubilized with 1% cholate, and stripped of adhering phospholipids by ammonium sulfate precipitation followed by solubilization with the non-ionic detergent Emulgen 911. The enzyme was further purified by successive ion-exchange chromatography on DEAE-Sephacel and Cellex-P and affinity chromatography on 3,3',5-triiodothyronine-Sepharose. Finally, the deiodinase was reacted with 6-propionyl-2-thiouracil-Sepharose, a derivative of the mechanism-based inhibitor 6-propyl-2-thiouracil. Covalent binding was observed only in the presence of substrate in agreement with the proposed mechanism of deiodination. The deiodinase was eluted from the affinity column by reduction of the enzyme-propylthiouracil mixed disulfide with 50 mM dithiothreitol. The enzyme was approximately 50% pure as judged by SDS-PAGE, exhibiting a subunit molecular weight of 25,000. This preparation was equally enriched in outer ring and inner ring deiodinase activities in keeping with the view that both are intrinsic to a single, type I deiodinase.

  4. Toxicity assessment of hydroxyapatite nanoparticles in rat liver cell model in vitro.

    Science.gov (United States)

    Sonmez, E; Cacciatore, I; Bakan, F; Turkez, H; Mohtar, Y I; Togar, B; Stefano, A D

    2016-10-01

    Hydroxyapatite nanoparticles (HAP NPs) are widely used for preparations of biomedical and biotechnological fields such as drug delivery, gene therapy, and molecular imaging. However, the current toxicological knowledge about HAP NPs is relatively limited. The present study was designed to investigate the toxicity potentials of various concentrations (0-1000 µg cm(-2)) of HAP NPs in cultured primary rat hepatocytes. Cell viability was detected by 3-(4,5-dimethyl-thiazol-2-yl) 2,5-diphenyltetrazolium bromide (MTT) assay and lactate dehydrogenase (LDH) release, while total antioxidant capacity (TAC) and total oxidative stress (TOS) levels were determined to evaluate the oxidative injury. The DNA damage was also analyzed via scoring liver micronuclei rates and determining 8-oxo-2-deoxyguanosine (8-OH-dG) levels. The results of MTT and LDH assays showed that the higher concentrations of dispersed HAP NPs (300, 500, and 1000 µg cm(-2)) decreased cell viability. Also, HAP NPs increased TOS (500 and 1000 µg cm(-2)) levels and decreased TAC (300, 500, and 1000 µg cm(-2)) levels in cultured hepatocytes. On the basis of increasing doses, the NPs as depending on dose caused significant increases of the number of micronucleated hepatocytes and 8-OH-dG levels as compared to control culture. Furthermore, the highest concentration of HAP NPs (1000 µg cm(-2)) exhibited cytotoxic activity. Based on these results, HAP NPs have a dose-dependent toxic effect in rat hepatocytes. Further extensive research in this field is promising and reasonable. © The Author(s) 2015.

  5. Protection effect of kallistatin on carbon tetrachloride-induced liver fibrosis in rats via antioxidative stress.

    Directory of Open Access Journals (Sweden)

    Xiaoping Huang

    Full Text Available Prolonged inflammation and oxidative stress are emerging as key causes of pathological wound healing and the development of liver fibrosis. We have investigated the effects of recombinant human kallistatin, produced in Pichia. pastoris, on preventing carbon tetrachloride (CCl4-induced liver fibrosis in rats. Daily administration of kallistatin prevented development of CCl4-induced liver fibrosis, which was evidenced by histological study. In all kallistatin treated rats, activation of hepatic stellate cells (HSC as assessed by s-smooth muscle actin staining was attenuated, TGF- β1 expression was inhibited, class I serum biomarkers associated with the process of fibrogenesis, such as hyaluronic acid, laminin, and procollagen III, were lowered, compared with that in the model control group. Furthermore, residual hepatic functional reserve was improved by kallistatin treatment. CCl4 induced elevation of malondialdehyde level and reduced superoxide dismutase activity in the liver, while kallistatin reduced these oxidative parameters. We also investigated the effects of kallistatin on rat primary HSC and LX-2, the human HSC cell line. Kallistatin scavenged H2O2-induced ROS in the LX-2 cells, and suppressed the activation of primary HSC. These results suggest recombinant human kallistatin might be a promising drug candidate for therapeutic intervention of liver fibrosis.

  6. Dehydroepiandrosterone (DHEA) Feeding Protects Liver Steatosis in Obese Breast Cancer Rat Model.

    Science.gov (United States)

    Hakkak, Reza; Bell, Andrea; Korourian, Soheila

    2017-03-20

    Obesity is a major health problem in the US and globally. Obesity is associated with the risk of cardiovascular disease, type 2 diabetes, cancers, hyperlipidemia, and liver steatosis development. Dehydroepiandrosterone (DHEA) is a dietary supplement used as an anti-obesity supplement. Previously, we reported that DHEA feeding protects 7,12-dimethylbenz(a)anthracene (DMBA)-induced mammary tumors. The objectives of this study were to investigate the effects of obesity and DHEA feeding on liver steatosis, body weight gain, and serum DHEA, DHEA sulfate (DHEA-S), insulin-like growth factor-1 (IGF-1), and insulin-like growth factor binding protein-3 (IGFBP-3) levels. Female Zucker rats were randomly assigned to either a control diet or a control diet with DHEA supplementation for 155 days. Livers were collected for histological examination. Serum was collected to measure DHEA, DHEA-S, IGF-1, and IGFBP-3. Our results show that DHEA-fed rats had significantly less liver steatosis (p DHEA feeding caused significant decreases (p DHEA and DHEA-S. Our results suggest that DHEA feeding can protect against liver steatosis by reducing body weight gain and modulating serum IGF-1 and IGFBP-3 levels in an obese breast cancer rat model.

  7. Effect of zinc supplementation on type 2 diabetes parameters and liver metallothionein expressions in Wistar rats.

    Science.gov (United States)

    Wang, Xue; Li, Hongyan; Fan, Zhe; Liu, Ya

    2012-12-01

    Zinc is a trace metal and acts as an active component of various enzymes. Zinc deficiency has been suggested to be associated with the development of diabetes. The present study investigated the role of zinc supplementation on prevention of diabetic conditions. A double-disease model mimicking hyperlipidemia and type 2 diabetes was created by applying high-fat diet and streptozotocin (STZ) to Wistar rats. We demonstrated that zinc supplementation improved symptoms of diabetes such as polydipsia and increased serum level of high-density lipoprotein cholesterol, indicating that zinc supplementation has a potential beneficial effect on diabetic conditions. The level of maldondialdehyde (MDA), an oxidative stress marker, was reduced in liver by zinc supplementation in high fat-fed rats with or without STZ injection. Meanwhile, we observed an increase in the expression of metallothioneins (MTs) in liver of rats treated with zinc. This suggests that the induction of MTs in liver, which has been shown to be important in scavenging free radicals, could be one of the underlying mechanisms of zinc supplementation on reducing MDA levels in liver. Finally, we found that zinc levels in liver were increased while there was no change in serum zinc levels, indicating that local zinc level might be a critical factor for the induction of MTs. Also, the level of MTs could potentially be an index of zinc bioavailability. Taken together, these results suggest that both zinc and MT could play an important role in balancing nutrition and metabolism to prevent diabetic development.

  8. Agmatine protects rat liver from nicotine-induced hepatic damage via antioxidative, antiapoptotic, and antifibrotic pathways.

    Science.gov (United States)

    El-Sherbeeny, Nagla A; Nader, Manar A; Attia, Ghalia M; Ateyya, Hayam

    2016-12-01

    Tobacco smoking with its various forms is a global problem with proved hazardous effects to human health. The present work was planned to study the defending role of agmatine (AGM) on hepatic oxidative stress and damage induced by nicotine in rats. Thirty-two rats divided into four groups were employed: control group, nicotine-only group, AGM group, and AGM-nicotine group. Measurements of serum hepatic biochemical markers, lipid profile, and vascular cell adhesion molecule-1 were done. In addition, malondialdehyde (MDA), superoxide dismutase (SOD), glutathione (GSH) activity, and nitrate/nitrite (NOx) levels were estimated in the liver homogenates. Immunohistochemistry for Bax and transforming growth factor beta (TGF-β1) and histopathology of the liver were also included. Data of the study demonstrated that nicotine administration exhibited marked liver deterioration, an increase in liver enzymes, changes in lipid profile, and an elevation in MDA with a decline in levels of SOD, GSH, and NOx (nitrate/nitrite). Also, levels of proapoptotic Bax and profibrotic TGF-β1 showed marked elevation in the liver. AGM treatment to rats in nicotine-only group ameliorated all the previous changes. These findings indicate that AGM could successfully overcome the nicotine-evoked hepatic oxidative stress and tissue injury, apoptosis, and fibrosis.

  9. HISTOPATHOLOGICAL STUDIES OF LIVER FUNCTION IN RATS FED ON GINGER LILLY CORM MEAL

    Directory of Open Access Journals (Sweden)

    UGWU OKECHUKWU P.C

    2013-01-01

    Full Text Available The effect of feeding Gladiolus unguiculata corm on a few liver function markers were evaluated in this study using albino Wistar rats. Twenty rats were randomly divided into four groups of five rats each. Various concentration of G. unguiculata formulations were fed to the test groups excluding the negative control which received normal feed for the 28 days of analysis. At the end of the feeding period the levels of the serum liver function markers of Aspartate aminotransferase (AST, Alanine aminotransferase (ALT, Alkaline phosphatase (ALP and Protein were determined. Mean serum liver function markers were all increased when compared with the control with only AST liver marker deviating. The ALT activity increased from 36.0 + 3.16 in the control to 38.0 + 3.16 in 20%. The AST significantly increased (p<0.05 from 66.0 + 3.16 in the 20% to 88.0 + 3.16 in the control group. ALP significantly increased from 47.0 +3.16 in the control group to 56.0 + 3.16 in 20%. Protein also increased from 7.0 +0.316 in the control group to 7.8 +0.316 in 20%. The results emanating from this study suggest that Gladiolus unguiculata corm formulations might have some deleterious effects on the liver function.

  10. Structural and ultrastructural study of rat liver influenced by electromagnetic radiation.

    Science.gov (United States)

    Holovská, K; Almášiová, V; Cigánková, V; Beňová, K; Račeková, E; Martončíková, M

    2015-01-01

    Mobile communication systems are undoubtedly an environmental source of electromagnetic radiation (EMR). There is an increasing concern regarding the interactions of EMR with the humans. The aim of this study was to examine the effects of EMR on Wistar rat liver. Mature rats were exposed to electromagnetic field of frequency 2.45 GHz and mean power density of 2.8 mW/cm2 for 3 h/d for 3 wk. Samples of the liver were obtained 3 h after the last irradiation and processed histologically for light and transmission electron microscopy. Data demonstrated the presence of moderate hyperemia, dilatation of liver sinusoids, and small inflammatory foci in the center of liver lobules. Structure of hepatocytes was not altered and all described changes were classified as moderate. Electron microscopy of hepatocytes revealed vesicles of different sizes and shapes, lipid droplets, and proliferation of smooth endoplasmic reticulum. Occasionally necrotizing hepatocytes were observed. Our observations demonstrate that EMR exposure produced adverse effects on rat liver.

  11. Telomerase activity (TMA) in tumour and peritumoural tissues in a rat liver cancer model.

    Science.gov (United States)

    Zhang, Huo-Jun; Yang, Ji-Jin; Tian, Jian-Ming; Wang, Pei-Jun; Shao, Cheng-Wei; Zuo, Chang-Jing; Zhang, Shun-Min; Gupta, Sanjay

    2009-02-01

    To study the levels of telomerase activity (TMA) in tumour and peritumoural tissues in a liver cancer model in rats, and to study the change in TMA expression over time. Using the telomeric repeated amplification protocol (TRAP), TMA was measured in tumour tissue, peritumoural tissue and normal liver tissue of Walker-256 tumour-bearing rats at 4, 6 and 8 days after tumour implantation. TMA at day 4, 6 and 8 was 0.767+/-0.117, 0.768+/-0.118 and 0.774+/-0.111 in tumour tissue, 0.389+/-0.263, 0.492+/-0.253 and 0.584+/-0.239 in peritumoural tissue, and 0.231+/-0.022, 0.229+/-0.022 and 0.233+/-0.021 in normal liver tissue, respectively. TMA in tumour tissue was higher than that in peri-tumour and normal liver tissues at all time points of measurement (P TMA levels in tumour tissue and normal liver tissue did not show any change over time. TMA level in the peritumoural tissue increased with time; TMA level in animals sacrificed at day 8 was higher than that seen in animals sacrificed at day 4 (P TMA in walker-256 tumour-bearing rats was higher than that in normal and peritumoural tissues. TMA level in the peritumoural tissue increased with time suggesting that TMA activation in peritumoural tissue may be an important factor promoting tumour growth.

  12. Hepatoprotective Effect of Low Doses of Caffeine on CCl4-Induced Liver Damage in Rats.

    Science.gov (United States)

    Cachón, Andrés Uc; Quintal-Novelo, Carlos; Medina-Escobedo, Gilberto; Castro-Aguilar, Gaspar; Moo-Puc, Rosa E

    2017-03-04

    Several studies have shown the hepatoprotective effect of the consumption of coffee and tea, which is mainly attributed to caffeine. Many experimental studies have demonstrated this effect; however, these studies used high caffeine doses that are not related to human consumption. The aim of this study was to evaluate the hepatoprotective effect of low doses of caffeine on carbon tetrachloride (CCl4)-treated rats. Low doses of caffeine (CAFF) 5 and 10 mg/kg (CAFF5 and CAFF10) were evaluated in chronic liver damage induced by CCl4 (0.75 mL/kg) in rats. CAFF treatment was administered once a day and CCl4 administration was twice weekly for 10 weeks. Liver function tests (biochemical markers) and functional (sleeping time) and histological (hematoxylin-eosin and Masson trichrome stains) parameters were carried out at the end of damage treatment. Daily treatments of CAFF5 and CAFF10 exhibited a hepatoprotective effect supported by a decrease of alanine aminotransferase (ALT), aspartate aminotransferase (AST), and alkaline phosphatase (AP) serum activities and bilirubin serum levels compared with control and also restored serum albumin levels and liver glutathione (GSH). Moreover, CAFF prevented CCl4-induced prolongation in pentobarbital sleeping time and a decrease of liver fibrosis and cell death. Our results demonstrated that low doses of CAFF exert a hepatoprotective effect against CCl4 -induced liver damage in rats.

  13. Messenger RNA patterns in rat liver nuclei before and after treat-ment with growth hormone.

    Science.gov (United States)

    Drews, J; Brawerman, G

    1967-06-09

    Like cortisol, growth hormone enhances RNA synthesis in rat liver nuclei. However, DNA-RNA hybridization experiments show that the application of growth hormone does not stimulate the formation of new species of messenger RNA. The latter phenomenon was observed after treatment with cortisol.

  14. The effect of dietary fat on the molecular species of lecithin from rat liver

    NARCIS (Netherlands)

    Golde, L.M.G. van; Deenen, L.L.M. van

    1966-01-01

    1. 1. Lecithins from the liver of rats maintained on diets devoid of essential fatty acids or supplemented with coconut oil or corn oil revealed significant differences in fatty acid composition, whilst monomolecular films of these lecithin samples exhibited only limited differences in force-area ch

  15. Effect of some organic solvents on oxidative phosphorylation in rat liver mitochondria

    DEFF Research Database (Denmark)

    Syed, Muzeeb; Skonberg, Christian; Hansen, Steen Honoré

    2013-01-01

    The effect of acetone, acetonitrile, dimethyl sulfoxide (DMSO), ethanol and methanol on oxidative phosphorylation (ATP synthesis) in rat liver mitochondria has been studied. All the organic solvents inhibited the oxidative phosphorylation in a concentration dependent manner, but with differences...... on oxidative phosphorylation in mitochondria should therefore include the use of relevant concentrations of the organic solvent in order to validate the contribution....

  16. Hepatoprotective Effects of Panus giganteus (Berk.) Corner against Thioacetamide- (TAA-) Induced Liver Injury in Rats.

    Science.gov (United States)

    Wong, Wei-Lun; Abdulla, Mahmood Ameen; Chua, Kek-Heng; Kuppusamy, Umah Rani; Tan, Yee-Shin; Sabaratnam, Vikineswary

    2012-01-01

    Panus giganteus, a culinary and medicinal mushroom consumed by selected indigenous communities in Malaysia, is currently being considered for large scale cultivation. This study was undertaken to investigate the hepatoprotective effects of P. giganteus against thioacetamide- (TAA-) induced liver injury in Sprague-Dawley rats. The rats were injected intraperitoneally with TAA thrice weekly and were orally administered freeze-dried fruiting bodies of P. giganteus (0.5 or 1 g/kg) daily for two months, while control rats were given vehicle or P. giganteus only. After 60 days, rats administered with P. giganteus showed lower liver body weight ratio, restored levels of serum liver biomarkers and oxidative stress parameters comparable to treatment with the standard drug silymarin. Gross necropsy and histopathological examination further confirmed the hepatoprotective effects of P. giganteus. This is the first report on hepatoprotective effects of P. giganteus. The present study showed that P. giganteus was able to prevent or reduce the severity of TAA-induced liver injury.

  17. Hepatoprotective Effects of Panus giganteus (Berk. Corner against Thioacetamide- (TAA- Induced Liver Injury in Rats

    Directory of Open Access Journals (Sweden)

    Wei-Lun Wong

    2012-01-01

    Full Text Available Panus giganteus, a culinary and medicinal mushroom consumed by selected indigenous communities in Malaysia, is currently being considered for large scale cultivation. This study was undertaken to investigate the hepatoprotective effects of P. giganteus against thioacetamide- (TAA- induced liver injury in Sprague-Dawley rats. The rats were injected intraperitoneally with TAA thrice weekly and were orally administered freeze-dried fruiting bodies of P. giganteus (0.5 or 1 g/kg daily for two months, while control rats were given vehicle or P. giganteus only. After 60 days, rats administered with P. giganteus showed lower liver body weight ratio, restored levels of serum liver biomarkers and oxidative stress parameters comparable to treatment with the standard drug silymarin. Gross necropsy and histopathological examination further confirmed the hepatoprotective effects of P. giganteus. This is the first report on hepatoprotective effects of P. giganteus. The present study showed that P. giganteus was able to prevent or reduce the severity of TAA-induced liver injury.

  18. The effect of dietary fat on the molecular species of lecithin from rat liver

    NARCIS (Netherlands)

    Golde, L.M.G. van; Deenen, L.L.M. van

    1966-01-01

    1. 1. Lecithins from the liver of rats maintained on diets devoid of essential fatty acids or supplemented with coconut oil or corn oil revealed significant differences in fatty acid composition, whilst monomolecular films of these lecithin samples exhibited only limited differences in force-area

  19. METABOLISM OF MYCLOBUTANIL AND TRIADIMEFON BY HUMAN AND RAT CYTOCHROME P450 ENZYMES AND LIVER MICROSOMES.

    Science.gov (United States)

    Metabolism of two triazole-containing antifungal azoles was studied using expressed human and rat cytochrome P450s (CYP) and liver microsomes. Substrate depletion methods were used due to the complex array of metabolites produced from myclobutanil and triadimefon. Myclobutanil wa...

  20. Ketogenesis in isolated rat-liver mitochondria. IV. Oxaloacetate decarboxylation: Consequences for metabolic calculations

    NARCIS (Netherlands)

    Lopes-Cardozo, M.; Bergh, S.G. van den

    1974-01-01

    Oxaloacetate which is formed by isolated rat-liver mitochondria during oxidation of malate may be decarboxylated to pyruvate by the action of oxaloacetate decarboxylase (EC 4.1.1.3). The pyruvate so formed is rapidly oxidized to acetyl-CoA from which citrate is formed by condensation with a second m

  1. The acylation of 1-acylglycero-3-phosphorylcholines by rat-liver microsomes

    NARCIS (Netherlands)

    Bosch, H. van den; Golde, L.M.G. van; Eibl, H.; Deenen, L.L.M. van

    1967-01-01

    1. 1. The transfer of acyl groups from acyl-coenzyme A derivatives to phosphatidylcholine by rat-liver microsomes was found to be significantly stimulated by the addition of synthetic 1-acylglycero-3-phosphorylcholines. Unsaturated acyl chains were transferred in preference to saturated ones, partic

  2. Expression of rat liver cell membrane transporters for thyroid hormone in Xenopus laevis oocytes

    NARCIS (Netherlands)

    R. Docter (Roel); E.C.H. Friesema (Edith); P.G.J. van Stralen (Paul); E.P. Krenning (Eric); M.E. Everts (Maria); T.J. Visser (Theo); G. Hennemann

    1997-01-01

    textabstractThe present study was conducted to explore the possible use of Xenopus laevis oocytes for the expression cloning of cell membrane transporters for iodothyronines. Injection of stage V-VI X. laevis oocytes with 23 ng Wistar rat liver polyadenylated RNA (mRNA)

  3. The effect of dietary fat on the molecular species of lecithin from rat liver

    NARCIS (Netherlands)

    Golde, L.M.G. van; Deenen, L.L.M. van

    1966-01-01

    1. 1. Lecithins from the liver of rats maintained on diets devoid of essential fatty acids or supplemented with coconut oil or corn oil revealed significant differences in fatty acid composition, whilst monomolecular films of these lecithin samples exhibited only limited differences in force-area ch

  4. Studies on the peroxisomal oxidation of palmitate and lignocerate in rat liver

    NARCIS (Netherlands)

    Wanders, R.J.A.; Roermund, C.W.T. van; Wijland, M.J.A. van; Schutgens, R.B.H.; Schram, A.W.; Bosch, H. van den; Tager, J.M.

    1987-01-01

    We have investigated the pathways involved in the peroxisomal oxidation of palmitate and lignocerate, measured as the cyanide-insensitive formation of acetyl units, in rat-liver homogenates. The peroxisomal β-oxidation of both fatty acids is dependent on the presence of ATP, coenzyme A, NAD+ and Mg2

  5. Effects of Aqueous Stem Extract of Massularia Acuminata on Some Liver Function Indices of Male Rats

    Directory of Open Access Journals (Sweden)

    Musa Toyin Yakubu

    2012-09-01

    Full Text Available Background: Massularia acuminata has been claimed to be used in managingseveral ailments in folk medicine and in some instances substantiated withscientific data. This however has been without recourse to its safety. Therefore,aqueous stem extract of M. acuminata was evaluated for its effects on somefunction indices of the liver of male rats.Methods: Sixty, male rats were grouped into 4 (A, B, C and D such that Group A(control was orally administered 1cm3 of distilled water while those in groups B, Cand D received orally 1 cm3 of extract corresponding to 250, 500 and 1000 mg/kgbody weight respectively. Some biochemical parameters of liver function wereevaluated in the animals after 1, 7 and 21 daily doses.Results: The extract significantly decreased (P<0.05 the activity of alkalinephosphatase in the liver of rats throughout the experimental period. This decreasewas accompanied by corresponding increase in the serum enzyme. In contrast, allthe doses of the extract increased the activities of both the AST and ALT in the liverand serum aspartate aminotransferase and alanine aminotransferase as well asthe concentrations of serum total bilirubin, protein and albumin.Conclusion: This study has revealed that the aqueous stem extract of Massulariaacuminata at the doses of 250-1000 mg/kg body weight hampered the normalfunctioning of the liver of male rats and is therefore not safe for oral consumption atthe doses investigated.

  6. Studies on the peroxisomal oxidation of palmitate and lignocerate in rat liver

    NARCIS (Netherlands)

    Wanders, R.J.A.; Roermund, C.W.T. van; Wijland, M.J.A. van; Schutgens, R.B.H.; Schram, A.W.; Bosch, H. van den; Tager, J.M.

    1987-01-01

    We have investigated the pathways involved in the peroxisomal oxidation of palmitate and lignocerate, measured as the cyanide-insensitive formation of acetyl units, in rat-liver homogenates. The peroxisomal β-oxidation of both fatty acids is dependent on the presence of ATP, coenzyme A, NAD+ and Mg2

  7. EFFECT OF MULTIGLYCOSIDES OF TRIPTERYGIUM WILFORDH (GTW) ON RAT TESTIS, HEART, LIVER AND KIDNEY

    Institute of Scientific and Technical Information of China (English)

    ZHOULan-Fang; LEIHai-Peng

    1989-01-01

    Adult male Wistar rats were given GTW orally at 50 rag/kg or 20 mg / kg for 4 or 5 weeks. Control animals were given the vehicle only. ARer treatment, testis, heart, liver and kidney were removed and examined. The scminiferous tubules of the treated

  8. Inhibition of classical complement activation attenuates liver ischaemia and reperfusion injury in a rat model

    NARCIS (Netherlands)

    B.H.M. Heijnen; I.H. Straatsburg; N.D. Padilla; G.J. Mierlo; C.E. Hack; T.M. van Gulik

    2006-01-01

    Activation of the complement system contributes to the pathogenesis of ischaemia/reperfusion (I/R) injury. We evaluated inhibition of the classical pathway of complement using C1-inhibitor (C1-inh) in a model of 70% partial liver I/R injury in male Wistar rats (n = 35). C1-inh was administered at 10

  9. [Biological function prediction of mir-210 in the liver of acute cold stress rat].

    Science.gov (United States)

    Guo, Wen-Jin; Lian, Shuai; Guo, Jing-Ru; Zhai, Jun-Fei; Zhang, Yu-Chen; Li, Yue; Zhen, Li; Ji, Hong; Yang, Huan-Min

    2016-04-25

    The study was aimed to observe mir-210 expression in liver tissue of acute cold stress rat and predict the function of mir-210 in cold stress. Thirty SPF Wistar male rats which were 12-week-old and weighed (340 ± 20) g were used. The rats were pre-fed in normal room temperature for one week, and then were randomly divided into acute cold stress group at (4 ± 0.1) °C and normal control group at (24 ± 0.1) °C. After the rats were treated with cold stress for 12 h, the liver tissue was extracted and the gene expression of mir-210 was assayed using qRT-PCR. The results demonstrated that the gene expression of mir-210 was significantly enhanced in acute cold stress group compared with that in normal control group (n = 3, P kinds of target genes such as E2F3, RAD52, ISCU and Ephrin-A3 are more relative with liver cold stress. ISCU regulates the cell respiratory metabolism and Ephrin-A3 is related with cell proliferation and apoptosis. On the other hand, up-regulated mir-210 affects the DNA repairing mechanism which usually leads to genetic instabilities. Our results suggest that cold stress-induced up-regulation of mir-210 in liver harmfully influences cell growth, energy metabolism and hereditary.

  10. Effect of fipronil on energy metabolism in the perfused rat liver.

    Science.gov (United States)

    de Medeiros, Hyllana Catarine Dias; Constantin, Jorgete; Ishii-Iwamoto, Emy Luiza; Mingatto, Fábio Erminio

    2015-07-02

    Fipronil is an insecticide used to control pests in animals and plants that can causes hepatotoxicity in animals and humans, and it is hepatically metabolized to fipronil sulfone by cytochrome P-450. The present study aimed to characterize the effects of fipronil (10-50μM) on energy metabolism in isolated perfused rat livers. In fed animals, there was increased glucose and lactate release from glycogen catabolism, indicating the stimulation of glycogenolysis and glycolysis. In the livers of fasted animals, fipronil inhibited glucose and urea production from exogenous l-alanine, whereas ammonia and lactate production were increased. In addition, fipronil at 50μM concentration inhibited the oxygen uptake and increased the cytosolic NADH/NAD⁺ ratio under glycolytic conditions. The metabolic alterations were found both in livers from normal or proadifen-pretreated rats revealing that fipronil and its reactive metabolites contributed for the observed activity. The effects on oxygen uptake indicated that the possible mechanism of toxicity of fipronil involves impairment on mitochondrial respiratory activity, and therefore, interference with energy metabolism. The inhibitory effects on oxygen uptake observed at the highest concentration of 50μM was abolished by pretreatment of the rats with proadifen indicating that the metabolites of fipronil, including fipronil sulfone, acted predominantly as inhibitors of respiratory chain. The hepatoxicity of both the parent compound and its reactive metabolites was corroborated by the increase in the activity of lactate dehydrogenase in the effluent perfusate in livers from normal or proadifen-pretreated rats.

  11. Increased in vitro phosphorylation of rat liver nucleolar proteins following triiodothyronine administration.

    Science.gov (United States)

    Fugassa, E; Gallo, G; Pertica, M

    1976-11-15

    It has been shown that triiodothyronine (Ta) administration to thyroidectomized rats induces an increase in the in vitro net 32P uptake into liver nucleolar proteins. Such an increase depends on a stimulation of the nucleolus-associated protein kinase activity and not on a lower dephosphorylation rate.

  12. The Restriction Fragment Map of Rat-Liver Mitochondrial DNA : A Reconsideration

    NARCIS (Netherlands)

    Pepe, G.; Bakker, H.; Holtrop, M.; Bollen, J.E.; Bruggen, E.F.J. van; Cantatore, P.; Terpstra, P.; Saccone, C.

    1977-01-01

    1. Rat-liver mitochondrial DNA (mtDNA) contains at least 8 cleavage sites for the restriction endonuclease Eco RI, 6 for the restriction endonuclease Hind III, 2 for the restriction endonuclease Bam HI and 11 for the restriction endonuclease Hap II. 2. The physical map of the restriction fragments o

  13. Effect of liver fatty acid binding protein on fatty acid movement between liposomes and rat liver microsomes.

    Science.gov (United States)

    McCormack, M; Brecher, P

    1987-01-01

    Although movement of fatty acids between bilayers can occur spontaneously, it has been postulated that intracellular movement is facilitated by a class of proteins named fatty acid binding proteins (FABP). In this study we have incorporated long chain fatty acids into multilamellar liposomes made of phosphatidylcholine, incubated them with rat liver microsomes containing an active acyl-CoA synthetase, and measured formation of acyl-CoA in the absence or presence of FABP purified from rat liver. FABP increased about 2-fold the accumulation of acyl-CoA when liposomes were the fatty acid donor. Using fatty acid incorporated into liposomes made either of egg yolk lecithin or of dipalmitoylphosphatidylcholine, it was found that the temperature dependence of acyl-CoA accumulation in the presence of FABP correlated with both the physical state of phospholipid molecules in the liposomes and the binding of fatty acid to FABP, suggesting that fatty acid must first desorb from the liposomes before FABP can have an effect. An FABP-fatty acid complex incubated with microsomes, in the absence of liposomes, resulted in greater acyl-CoA formation than when liposomes were present, suggesting that desorption of fatty acid from the membrane is rate-limiting in the accumulation of acyl-CoA by this system. Finally, an equilibrium dialysis cell separating liposomes from microsomes on opposite sides of a Nuclepore filter was used to show that liver FABP was required for the movement and activation of fatty acid between the compartments. These studies show that liver FABP interacts with fatty acid that desorbs from phospholipid bilayers, and promotes movement to a membrane-bound enzyme, suggesting that FABP may act intracellularly by increasing net desorption of fatty acid from cell membranes. PMID:3446187

  14. Liver-protecting and fibrosis-resisting effect of Ganxianning on rats withspleen deficiency and stagnation of Liver-qi

    Institute of Scientific and Technical Information of China (English)

    Zhen Qiu Guo; Xiao Wei Zhao; Xin Yu Chen

    2000-01-01

    AIM To study the liver-protecting and fibrosis-resisting effect of Ganxianning (GXN) and its mechanism.METHODS Model of carbon tetrachloride hepatic injury fibrosis rats was reproduced. In the experimentthere were six groups, the treatment groups with GXN's large, moderate and small dose (GXNb, GXNm andGXNs), the treatment group with colchicine, the blank model group and normal control group. The course of treatment was 30 days, then the rats were killed with their blood and liver tested.RESULTS In treatment groups, alanine aminotransferase (ALT) was lower than that in the model group(P<0.01), and albumin (Alb) higher than that in the model (P<0.01). Hydroxylproline (Hyp) and redcell membrane C3B receptor garland in GXNb's and GXNm's groups were lower and circulation complex(CIC) was slightly higher. Fibrinogen (Fb) in both colchicine and model groups was higher than that innormal group and the difference was significant (P<0.05, P<0.01). Compared with model group, acid-α-naphthyl acetate esterase (ANAE) increased in GXNb's and GXNm's groups (P<0.05, P<0.01). Underlight and electron microscopes, level of hepatic fibrosis of GXN groups was much lower than that of themodel group, P<0.01, and their difference was very significant. In GXNms group, liver cell was normal onthe whole and its chromatin was more than the model group and its nucleolus was evident.CONCLUSION GXN has rather good functions of protecting liver and resisting fibrosis, and thesefunctions are related to the increase of ANAE and C3b, decrease of CIC and Fb. and improvement of bodyimmunity function.

  15. Efficacy of Boesenbergia rotunda Treatment against Thioacetamide-Induced Liver Cirrhosis in a Rat Model

    Directory of Open Access Journals (Sweden)

    Suzy M. Salama

    2012-01-01

    Full Text Available Background. Experimental research in hepatology has focused on developing traditional medicines into potential pharmacological solutions aimed at protecting liver from cirrhosis. Along the same line, this study investigated the effects of ethanol-based extract from a traditional medicine plant Boesenbergia rotunda (BR on liver cirrhosis. Methodology/Results. The BR extract was tested for toxicity on 3 groups of rats subjected to vehicle (10% Tween 20, 5 mL/kg and 2g/kg and 5g/kg doses of the extract, respectively. Next, experiments were conducted on a rat model of cirrhosis induced by thioacetamide injection. The rats were divided into five groups and, respectively, administered orally with 10% Tween-20 (5 mL/kg (normal control group, 10% Tween-20 (5 mL/kg (cirrhosis control group, 50 mg/kg of silymarin (reference control group, and 250 mg/kg and 500 mg/kg of BR extract (experimental groups daily for 8 weeks. The rats in normal group were intraperitoneally injected with sterile distilled water (1 mL/kg 3 times/week, and those in the remaining groups were injected intraperitoneally with thioacetamide (200 mg/kg thrice weekly. At the end of the 8 weeks, the animals were sacrificed and samples were collected for comprehensive histopathological, coagulation profile and biochemical evaluations. Also, the antioxidant activity of the BR extract was determined and compared with that of silymarin. Data from the acute toxicity tests showed that the extract was safe to use. Histological analysis of the livers of the rats in cirrhosis control group revealed uniform coarse granules on their surfaces, hepatocytic necrosis, and lymphocytes infiltration. But, the surfaces morphologically looked much smoother and the cell damage was much lesser in those livers from the normal control, silymarin and BR-treated groups. In the high-dose BR treatment group, the livers of the rats exhibited nearly normal looking lobular architecture, minimal inflammation

  16. Ultrasound imaging in an experimental model of fatty liver disease and cirrhosis in rats

    Directory of Open Access Journals (Sweden)

    Campos de Carvalho Antonio

    2010-01-01

    Full Text Available Abstract Background Domestic dogs and cats are very well known to develop chronic hepatic diseases, including hepatic lipidosis and cirrhosis. Ultrasonographic examination is extensively used to detect them. However, there are still few reports on the use of the ultrasound B-mode scan in correlation with histological findings to evaluate diffuse hepatic changes in rodents, which represent the most important animal group used in experimental models of liver diseases. The purpose of this study was to determine the reliability of ultrasound findings in the assessment of fatty liver disease and cirrhosis when compared to histological results in Wistar rats by following up a murine model of chronic hepatic disease. Results Forty Wistar rats (30 treated, 10 controls were included. Liver injury was induced by dual exposure to CCl4 and ethanol for 4, 8 and 15 weeks. Liver echogenicity, its correlation to the right renal cortex echogenicity, measurement of portal vein diameter (PVD and the presence of ascites were evaluated and compared to histological findings of hepatic steatosis and cirrhosis. Liver echogenicity correlated to hepatic steatosis when it was greater or equal to the right renal cortex echogenicity, with a sensitivity of 90%, specificity of 100%, positive and negative predictive values of 100% and 76.9% respectively, and accuracy of 92.5%. Findings of heterogeneous liver echogenicity and irregular surface correlated to liver cirrhosis with a sensitivity of 70.6%, specificity of 100%, positive and negative predictive values of 100% and 82.1% respectively, and accuracy of 87.5%. PVD was significantly increased in both steatotic and cirrhotic rats; however, the later had greater diameters. PVD cut-off point separating steatosis from cirrhosis was 2.1 mm (sensitivity of 100% and specificity of 90.5%. One third of cirrhotic rats presented with ascites. Conclusion The use of ultrasound imaging in the follow-up of murine diffuse liver disease

  17. Sinusoidal microcirculatory changes after small-for-size liver transplantation in rats.

    Science.gov (United States)

    Li, Junjian; Liang, Liang; Ma, Tao; Yu, Xiazhen; Chen, Wei; Xu, Guodong; Liang, Tingbo

    2010-09-01

    Small-for-size graft injury is characterized by portal venous hypertension and loss of intracellular homeostasis early after transplant. The long-term alteration of sinusoidal microcirculatory hemodynamic state remains unknown. A syngeneic rat orthotopic liver transplantation model was developed using small-for-size grafts (35% of recipient liver weight) or whole grafts (100% of recipient liver weight). Graft survival, portal pressure, liver function, hepatocellular apoptosis as well as morphological changes (by light microscopy and electron microscopy) were assessed. Sinusoidal microcirculatory hemodynamics was examined by intravital fluorescence microscopy. Although portal hypertension lasted only for 1 h after performance of small-for-size liver transplantation, a sustained microcirculatory disturbance was accompanied by dramatic reduction of sinusoidal perfusion rate, elevation of sinusoidal diameter as well as increase in the number of apoptotic hepatocytes during the first 7 days. These resulted in lower survival rate (50% vs. 100%, P = 0.012), higher level of liver function, and more severe morphological changes, which could induce small-for-size syndrome. In conclusion, persistent microcirculatory hemodynamic derangement during the first 7 days after reperfusion as well as transient portal hypertension is significant manifestation after small-for-size liver transplantation. Long-term microcirculation disturbance displayed as decrease of sinusoidal reperfusion area and increase of spread in functional liver mass seems to be the key factor for graft injuries.

  18. Lipid composition of liver microsomes and mitochondria after acute and chronic {gamma}-irradiation of rats

    Energy Technology Data Exchange (ETDEWEB)

    Markevich, L.N.; Kolomiitseva, I.K. [Institute of Cell Biophysics, Moscow (Russian Federation)

    1994-07-01

    Acute {gamma}-irradiation of rats at doses of 100 and 270 Gy stimulates lipid synthesis and changes the lipid composition of liver cell organelles. The content of cholesterol and cholesterol esters in microsomes increased at 100 Gy and decreased at 270 Gy, with total phospholipid content remaining unchanged. The lipid content in mitochondria decreased considerably 1 h after irradiation at 270 Gy. This change was significantly less pronounced 47 h later. Under chronic {gamma}-irradiation (0.129 Gy/day), cholesterol and cardiolipin in mitochondria increased. The changes in lipid content caused by acute irradiation are presumed to be related to activated synthesis of lipids in the liver. The modification of the lipid content of mitochondria observed in chronically irradiated rats may indicate that energy-metabolizing liver cell systems are involved in the adaptation to irradiation.

  19. Effect of insulin and glucose on the activity of insulin-degrading enzymes in rat liver.

    Science.gov (United States)

    Jurcovicová, J; Németh, S; Vigas, M

    1977-09-01

    The degradation of insulin by insulin protease and glutathion-insulin transhydrogenase (glutathioneproteindisulphide oxidoreductase--EC 1.8.4.2, GIT) was measured in rat liver either after replacing food and water by 15% glucose solution, or after daily insulin administration 8 U daily for 3 days or after fasting. The breakdown of radioiodinated insulin was followed by measuring the increase of TCA soluble radioactivity during incubation of cell fractions with 125I insulin at 37 degrees C. The highest GIT activity was observed in liver microsomes of rats after glucose feeding and after insulin administration, whereas enzyme activity of fasted animals did not essentially differ from corresponding values of normally fed controls. The insulin protease in cytosol of liver cells remained unchanged after these procedures. The important role of GIT in insulin degradation seems to be conclusively demonstrated.

  20. Pharmacologic application of fourier transform IR spectroscopy: in vivo toxicity of carbon tetrachloride on rat liver.

    Science.gov (United States)

    Melin, A M; Perromat, A; Déléris, G

    2000-01-01

    Microsomal fractions from rat liver were examined by means of Fourier transform IR (FTIR) spectroscopy to study the in vivo toxic effect of carbon tetrachloride administered by intraperitoneal injection. Lipid content was significantly enhanced in the liver of treated rats compared with untreated ones. The level of saturated fatty acids largely increased while that of unsaturated acids slightly decreased as a consequence of lipid peroxidation induced by the xenobiotic compound. The conformational structure of membrane proteins was changed, which was shown by the large decrease in the alpha-helical configuration. In the polysaccharide region we observed an important loss in glucidic structures that could be related to the metabolic changes caused by carbon tetrachloride intoxication. Thus, FTIR spectroscopy appears to be a useful tool to rapidly investigate the chemical alterations induced by this drug in liver microsomes and to correlate them with biochemical and physiological data.

  1. The 14-day repeated dose liver micronucleus test with methapyrilene hydrochloride using young adult rats.

    Science.gov (United States)

    Inoue, Kenji; Ochi, Akimu; Koda, Akira; Wako, Yumi; Kawasako, Kazufumi; Doi, Takaaki

    2015-03-01

    The repeated dose liver micronucleus (RDLMN) assay using young adult rats has the potential to detect genotoxic hepatocarcinogens that can be integrated into a general toxicity study. The assay methods were thoroughly validated by 19 Japanese facilities. Methapyrilene hydrochloride (MP), known to be a non-genotoxic hepatocarcinogen, was examined in the present study. MP was dosed orally at 10, 30 and 100mg/kg/day to 6-week-old male Crl:CD (SD) rats daily for 14 days. Treatment with MP resulted in an increase in micronucleated hepatocytes (MNHEPs) with a dosage of only 100mg/kg/day. At this dose level, cytotoxicity followed by regenerative cell growth was noted in the liver. These findings suggest that MP may induce clastogenic effects indirectly on the liver or hepatotoxicity of MP followed by regeneration may cause increase in spontaneous incidence of MNHEPs.

  2. Alloimmune activation promotes anti-cancer cytotoxicity after rat liver transplantation.

    Science.gov (United States)

    Lacotte, Stéphanie; Oldani, Graziano; Slits, Florence; Orci, Lorenzo A; Rubbia-Brandt, Laura; Morel, Philippe; Mentha, Gilles; Toso, Christian

    2014-01-01

    Liver transplantation for hepatocellular carcinoma (HCC) results in a specific condition where the immune response is potentially directed against both allogeneic and cancer antigens. We have investigated the level of anti-cancer immunity during allogeneic immune response. Dark Agouti-to-Lewis and Lewis-to-Lewis rat liver transplantations were performed and the recipients anti-cancer immunity was analysed at the time of alloimmune activation. The occurrence of rejection in the allogeneic recipients was confirmed by a shorter survival (ptests (pcytotoxicity (pcytotoxicity (pcytotoxicity was mediated through the NKG2D receptor, whose expression was increased in the rejected graft (pcytotoxicity. Although waiting for in vivo validation, alloimmune-associated cytotoxicity after rat liver transplantation appears to be linked to increased frequencies and levels of activation of NK cells and monocyte/macrophages, and is at least in part mediated through the NKG2D receptor.

  3. Procedure for Decellularization of Rat Livers in an Oscillating-pressure Perfusion Device.

    Science.gov (United States)

    Hillebrandt, Karl; Polenz, Dietrich; Butter, Antje; Tang, Peter; Reutzel-Selke, Anja; Andreou, Andreas; Napierala, Hendrik; Raschzok, Nathanael; Pratschke, Johann; Sauer, Igor M; Struecker, Benjamin

    2015-08-10

    Decellularization and recellularization of parenchymal organs may enable the generation of functional organs in vitro, and several protocols for rodent liver decellularization have already been published. We aimed to improve the decellularization process by construction of a proprietary perfusion device enabling selective perfusion via the portal vein and/or the hepatic artery. Furthermore, we sought to perform perfusion under oscillating surrounding pressure conditions to improve the homogeneity of decellularization. The homogeneity of perfusion decellularization has been an underestimated factor to date. During decellularization, areas within the organ that are poorly perfused may still contain cells, whereas the extracellular matrix (ECM) in well-perfused areas may already be affected by alkaline detergents. Oscillating pressure changes can mimic the intraabdominal pressure changes that occur during respiration to optimize microperfusion inside the liver. In the study presented here, decellularized rat liver matrices were analyzed by histological staining, DNA content analysis and corrosion casting. Perfusion via the hepatic artery showed more homogenous results than portal venous perfusion did. The application of oscillating pressure conditions improved the effectiveness of perfusion decellularization. Livers perfused via the hepatic artery and under oscillating pressure conditions showed the best results. The presented techniques for liver harvesting, cannulation and perfusion using our proprietary device enable sophisticated perfusion set-ups to improve decellularization and recellularization experiments in rat livers.

  4. Peroxisome proliferator-activated receptor γ ligands suppress liver carcinogenesis induced by diethylnitrosamine in rats

    Institute of Scientific and Technical Information of China (English)

    Yan-Tong Guo; Xi-Sheng Leng; Tao Li; Jing-Ming Zhao; Xi-Hou Lin

    2004-01-01

    AIM: Peroxisome proliferator-activated receptor γ (PPARγ)is known to regulate growth arrest and terminal differentiation of adipocytes and is used clinically as a new class of antidiabetic drugs. Recently, several studies have reported that treatment of cancer cells with PPARγ ligands could induce cell differentiation and apoptosis, suggesting a potential application as chemopreventive agents against carcinogenesis. In the present study, 3 different kinds of PPARγ ligands were subjected to the experiments to confirm their suppressive effects on liver carcinogenesis.METHODS: Three PPARγ ligands, pioglitazone (Pio) (200 ppm),rosiglitazone (Rosi) (200 ppm), and troglitazone (Tro)(1 000 ppm) were investigated on the induction of the placental form of rat glutathione S-transferase (rGST P)positive foci, a precancerous lesion of the liver, and liver cancer formation using a diethylnitrosamine-induced liver cancer model in Wistar rats, and dose dependency of a PPARγ ligand was also examined.RESULTS: PPARγ ligands reduced the formation of rGST P-positive foci by diethylnitrosamine and induction of liver cancers was also markedly suppressed by a continuous feeding of Pio at 200 ppm.CONCLUSION: PPARγ ligands are potential chemopreventive agents for liver carcinogenesis.

  5. Saturated hydrogen saline attenuates endotoxin-induced acute liver dysfunction in rats.

    Science.gov (United States)

    Xu, X-F; Zhang, J

    2013-01-01

    To determine the effect of saturated hydrogen saline on lipopolysaccharide (LPS)-induced acute liver dysfunction, rats were divided into control, LPS, and LPS plus saturated hydrogen saline (LPS+H(2)) groups. Treatment with saturated hydrogen saline prolonged the median survival time and reduced liver dysfunction. Moreover, saturated hydrogen saline significantly reduced pathological alterations in liver tissues, the number of ballooned hepatocytes, serum tumor necrosis factor (TNF)-alpha and interleukin (IL)-6 levels, and myeloperoxidase (MPO) and malondialdehyde (MDA) levels in liver tissues (Phydrogen saline treatment. Saturated hydrogen saline also decreased phosphorylated extracellular signal-regulated kinase (p-ERK), phosphorylated Jun kinase (p-JNK), nuclear factor-kappa B (NF-kappaB), and second mitochondria-derived activator of caspase (Smac) levels, and increased p38 activation (Phydrogen saline may attenuate LPS-induced acute liver dysfunction in rats, possibly by reducing inflammation and cell apoptosis. Mitogen-activated protein kinase (MAPK), NF-kappaB, and Smac may contribute to saturated hydrogen saline-mediated liver protection.

  6. Ischemia and reperfusion injury of the rat liver: the role of nimodipine.

    Science.gov (United States)

    Chávez-Cartaya, R E; Pino DeSola, G; Ramirez-Romero, P; Calne, R Y; Jamieson, N V

    1996-01-01

    The protective effect of the calcium channel blocker nimodipine on liver ischemia and reperfusion was studied in the rat. The homeostasis of intracellular calcium ions seems to be a determinant factor in the cell injury that appears after ischemia and reperfusion. Nimodipine was used to downregulate the calcium levels in the cytosol of the ischemic cell, the hypothetical role of Ca2+ in the pathogenesis of ischemia and reperfusion injury. The experimental procedure consisted of the temporary interruption of blood flow to the left lateral and medial lobes of the rat liver and subsequent reperfusion after a period of 45 min of ischemia. Nimodipine (10 micrograms/kg body wt) was administered either before or after the onset of ischemia. The postischemic liver blood flow and liver oxyhemoglobin saturation were recorded using a He-Ne laser Doppler flowmeter and photometer, which showed, in the pretreated group, a recovery of reperfusion blood flow (58.1%) and liver reflectance (85.5%) significantly better (P flow (32.8%) and reflectance (70.5%). In the group that received nimodipine after ischemia, the recovery of the blood flow and the postreperfusion liver reflectance were not significantly better than those in the untreated control group. ALT levels (P < 0.05), galactose elimination capacity (P < 0.001), and histological studies also showed a protective effect of calcium antagonist nimodipine when administered before ischemia.

  7. Immunological basis of septal fibrosis of the liver in Capillaria hepatica-infected rats

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    Lemos Q.T.

    2003-01-01

    Full Text Available Rats infected with the helminth Capillaria hepatica regularly develop septal fibrosis of the liver similar to that induced by repeated ip injections of pig serum. Fibrosis starts when the focal parasitic lesions begin to show signs of resorption, thus suggesting an immunologically mediated pathogenesis of this fibrosis. To explore this possibility, the development of C. hepatica-related hepatic fibrosis was observed in rats exposed to worm antigens from the first neonatal day onward. Wistar rats (150 g were either injected ip with an extract of C. hepatica eggs (protein concentration: 1 mg/ml or received immature eggs by gavage from the first neonatal day until adult life and were then infected with 500 embryonated eggs. Changes were monitored on the basis of serum levels of anti-worm antibodies and hepatic histopathology. Rats submitted to immunological oral tolerance markedly suppressed C. hepatica-related serum antibodies and septal fibrosis of the liver when infected with the helminth later on. Tolerance trials with ip injections of worm antigens gave essentially negative results. The partial suppression of septal fibrosis of the liver after the induction of immunological tolerance to C. hepatica antigens in rats indicates an immunological basis for the fibrosis and emphasizes the importance of immunological factors in the pathogenesis of hepatic fibrosis.

  8. A rat liver foci promotion study with 50-Hz magnetic fields.

    Science.gov (United States)

    Rannug, A; Holmberg, B; Mild, K H

    1993-08-01

    To investigate the possible tumor-promoting effect of magnetic fields (MF), we have performed two liver foci bioassays in rats which were exposed to MF at four flux density levels (0.5 microT, 5 microT, 0.05 mT, and 0.5 mT). The MF were generated in exposure equipment consisting of copper coils surrounding racks with animal cages and giving homogenous horizontal 50-Hz magnetic fields. Rats previously submitted to partial hepatectomy and diethylnitrosamine treatment were exposed to MF for 12 weeks. Exposed and control rats were kept in separate rooms. As a positive control phenobarbital (PB) was administered for 12 weeks. The number, area, and volume of foci expressing gamma-glutamyl transpeptidase (GGT) and glutathione S-transferase (GST-p) were evaluated. The body weight gains and relative liver weights of MF-exposed rats were not different as compared to control rats. There was a slight increase in GGT-staining foci, but not in GST-p-staining foci, in the groups exposed to flux densities of 0.5 microT and 0.05 mT compared to the control group in the first experiment. The number of both GGT- and GST-p-staining foci in the livers of all MF-exposed groups were, however, within the control range when the results of the two experiments were considered together.

  9. Direct and indirect effects of kisspeptin on liver oxidant and antioxidant systems in young male rats.

    Science.gov (United States)

    Aydin, M; Oktar, S; Yonden, Z; Ozturk, O H; Yilmaz, B

    2010-06-01

    Kisspeptin is a recently discovered hypothalamic peptide which plays an important role in the central control of reproductive functions. We have investigated direct and indirect effects of kisspeptin on the liver oxidative stress in young male rats. Twenty-four rats were divided into four groups (n = 6/group). First group served as control and received saline. Kisspeptin-10 was administered to the animals in the second group (20 nmol/rat/day), for a period of 7 days. Rats were given only one dose gosereline (0.9 mg/rat), a GnRH agonist in the third group. The last group received kisspeptin-10 with gosereline. The activities of catalase, superoxide dismutase (SOD), xanthine oxidase (XO), adenosine deaminase (AD) and level of malondialdehyde were studied in liver tissue. Serum samples were separated for total antioxidant capacity (TAC), total oxidant status (TOS), alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase, blood urea nitrogen (BUN), colesterol, high-density lipoprotein (HDL) and triglyceride. Kisspeptin increased the activities of SOD and catalase (p < 0.05). When compared to the control group, the levels of malondialdehyde, TOS and AST were lower, but levels of BUN, cholesterole, HDL and AD were higher in the other three groups (p < 0.05). In conclusion, our findings suggest that kisspeptin may have antioxidant and thus protective effects on the liver tissue. 2010 John Wiley & Sons, Ltd.

  10. Heme oxygenase-1 overexpression increases liver injury after bile duct ligation in rats

    Institute of Scientific and Technical Information of China (English)

    Matthias Froh; Ronald G Thurman; Lars Conzelmann; Peter Walbrun; Susanne Netter; Reiner Wiest; Michael D Wheeler; Mark Lehnert; Takehiko Uesugi; Jurgen Scholmerich

    2007-01-01

    AIM: To investigate the effects of heme oxygenase-1(HO-1) against oxidant-induced injury caused by bile duct ligation (BDL).METHODS: Either cobalt protoporphyrin (CoPP), a HO-1 inducer, or saline were injected intraperitoneally in male SD-rats. Three days later, BDL or sham-operations were performed. Rats were sacrificed 3 wk after BDL and livers were harvested for histology. Fibrosis was evaluated by sirius red staining and image analysis.Alpha-smooth muscular actin, which indicates activation of stellate cells, was detected by immunohistochemical staining, and cytokine and collagen- Ⅰα (Col- Ⅰα) mRNA expression was detected using RNase protection assays.RESULTS: Serum alanine transaminase increased 8-fold above normal levels one day after BDL. Surprisingly,enzyme release was not reduced in rats receiving CoPP.Liver fibrosis was evaluated 3 wk after BDL and the sirius red-positive area was found to be increased to about 7.8%. However, in CoPP pretreated rats sirius redpositive areas were increased to about 11.7% after BDL.Collagen- Ⅰα and TGF-β mRNA increased significantly by BDL. Again, this effect was increased by HO-1overexpression.CONCLUSION: Hepatic fibrosis due to BDL is not reduced by the HO-1 inducer CoPP. In contrast, HO-1overexpression increases liver injury in rats under conditions of experimental chronic cholestasis.

  11. Integrative proteomic and microRNA analysis of the priming phase during rat liver regeneration.

    Science.gov (United States)

    Geng, Xiaofang; Chang, Cuifang; Zang, Xiayan; Sun, Jingyan; Li, Pengfei; Guo, Jianli; Xu, Cunshuan

    2016-01-10

    The partial hepatectomy (PH) model provides an effective medium for study of liver regeneration (LR). Considering that LR is regulated by microRNAs (miRNAs), investigation of the regulatory role of miRNAs is critical for revealing how regenerative processes are initiated and controlled. Using high-throughput sequencing technology, we examined miRNA expression profiles of the regenerating rat liver after PH, and found that 23 miRNAs were related to rat LR. Among them, several miRNAs were significantly altered at 2h and 6h after PH, corresponding to the priming phase of LR. Furthermore, we examined the protein profiles in the regenerating rat liver at 2h and 6h after PH by iTRAQ coupled with LC-MS/MS, and found that 278 proteins were significantly changed. Subsequently, an integrative proteomic and microRNA analysis by Ingenuity Pathway Analysis 9.0 (IPA) software showed that miR-125a, miR-143, miR-150, miR-181c, miR-182, miR-183, miR-199a, miR-429 regulated the priming phase of rat LR by modulating the expression of proteins involved in networks critical for cell apoptosis, cell survival, cell cycle, inflammatory response, metabolism, etc. Thus, our studies provide novel evidence for a functional molecular network populated by the down-regulated targets of the up-regulated miRNAs in the priming phase of rat LR.

  12. CLONING AND ANALYSIS OF THE GENOMIC DNA SEQUENCE OF AUGMENTER OF LIVER REGENERATION FROM RAT

    Institute of Scientific and Technical Information of China (English)

    董菁; 成军; 王勤环; 施双双; 王刚; 斯崇文

    2002-01-01

    Objective.To search for genomic DNA sequence of the augmenter of liver regeneration (ALR) of rat.Methods.Polymerase chain reaction (PCR) with specific primers was used to amplify the sequence from the rat genome.Results.A piece of genomic DNA sequence and a piece of pseudogene of rat ALR were identified.The lengths of the gene and pseudogene are 1508 bp and 442 bp,respectively.The ALR gene of rat includes 3 exons and 2 introns.The 442 bp DNA sequence may represent a pseudogene or a ALR related peptide.Predicted amino acid sequence analysis showed that there were 14 different amino acid residues between the gene and pseudogene.ALR related peptide is 84 amino acid residues in length and relates closely to ALR protein.Conclusion.There might be a multigene family of ALR in rat.

  13. Immunohistochemical Analysis of Platelet Extract Effects on Liver Injury Induced by CCl4 in Male Rats

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    Zahra Hesami

    2016-01-01

    Full Text Available Backgrounds & objectives: Liver damage results in a large accumulation of external cellular matrix that affects the function of this important body organ in a long term and finally stops its function completely. The growth factors existing in platelet extract are more cost-effective, available, and stable than recombinant ones. To determine whether the platelet extract effects on histological changes in liver injury induced by carbon tetrachloride (CCl4, we used immunohistochemical analysis in male rats. Methods: In this project the 28 male Wistar rats (250-300 g were randomly divided into 4 groups, each consisting of 7 animals. The rats were divided into four experimental groups as follows: the first group (sham intraperitoneally received only olive oil as the solvent of carbon tetrachloride; second group (CCl4 intraperitoneally received carbon tetrachloride dissolved in olive oil (ratio of about 1: 1 at a concentration of 1 ml/kg and a twice a week for eight weeks; third group subcutaneously received only platelet extract at a concentration of 0.5 ml/kg twice a week for three weeks; and fourth group received both CCl4 intraperitoneally for eight weeks and platelet extract subcutaneously for last three weeks. After 8 weeks of trial blood and liver sampling were done. Blood samples sent for enzymatic (AST, ALT tests and liver samples tested for histological and immunohistochemical studies. The data were analyzed using  one-way ANOVA followed by Tukey test by Graph pad Prism 5 software and data were considered significant at p≤ 0.05. Results: The results show that platelet extract causes a significant (p≤ 0.001 decrease in liver enzymes and albumin improves the function of liver. The level of alfa smooth muscle actin (α-SMA as an index of hepatic stellate cell activation was decreased by platelet extract administration which eventually reduced the necrosis and fibrosis induced by carbon tetrachloride in studied rats

  14. Chronic administration of fluoxetine or clozapine induces oxidative stress in rat liver: a histopathological study.

    Science.gov (United States)

    Zlatković, Jelena; Todorović, Nevena; Tomanović, Nada; Bošković, Maja; Djordjević, Snežana; Lazarević-Pašti, Tamara; Bernardi, Rick E; Djurdjević, Aleksandra; Filipović, Dragana

    2014-08-01

    Chronic exposure to stress contributes to the etiology of mood disorders, and the liver as a target organ of antidepressant and antipsychotic drug metabolism is vulnerable to drug-induced toxicity. We investigated the effects of chronic administration of fluoxetine (15mg/kg/day) or clozapine (20mg/kg/day) on liver injury via the measurement of liver enzymes, oxidative stress and histopathology in rats exposed to chronic social isolation (21days), an animal model of depression, and controls. The activity of serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST), the liver content of carbonyl groups, malonyldialdehyde (MDA), reduced glutathione (GSH), cytosolic glutathione S-transferase (GST) and nitric oxide (NO) metabolites were determined. We also characterized nuclear factor-κB (NF-κB), cyclooxygenase-2 (COX-2) and CuZn-superoxide dismutase (CuZnSOD) protein expression as well as histopathological changes. Increased serum ALT activity in chronically-isolated and control animals treated with both drugs was found while increased AST activity was observed only in fluoxetine-treated rats (chronically-isolated and controls). Increased carbonyl content, MDA, GST activity and decreased GSH levels in drug-treated controls/chronically-isolated animals suggest a link between drugs and hepatic oxidative stress. Increased NO levels associated with NF-κB activation and the concomitant increased COX-2 expression together with compromised CuZnSOD expression in clozapine-treated chronically-isolated rats likely reinforce oxidative stress, observed by increased lipid peroxidation and GSH depletion. In contrast, fluoxetine reduced NO levels in chronically-isolated rats. Isolation induced oxidative stress but histological changes were similar to those observed in vehicle-treated controls. Chronic administration of fluoxetine in both chronically-isolated and control animals resulted in more or less normal hepatic architecture, while clozapine in both groups

  15. Relationship between alpha-1 receptors and cations in rat liver plasma membranes

    Energy Technology Data Exchange (ETDEWEB)

    Smart, J.L.

    1986-01-01

    The influence of cations on binding of (/sup 3/H)-prazosin (PRZ), an alpha-1 specific antagonist, to alpha receptor sites in rat liver plasma membranes was examined. All cations tested were able to produce dose-dependent shifts to lower affinity binding sites for PRZ. The maximum number of binding sites was also observed to be altered. Inclusion of cations resulted in a slower observed rate constant for association as well as a delay in the dissociation of specifically bound PRZ following the addition of phentolamine. In contrast, the ability of (-)-norepinephrine to displace PRZ was enhanced by the addition of cations. The influence of alpha-1 receptor stimulation on Na/sup +//K/sup +/-ATPase activity in rat liver was examined by two methods - rat liver plasma membrane Na/sup +//K/sup +/-ATPase activity following liver perfusion in situ and /sup 86/Tb uptake in rat liver slices. The activity of the Na/sup +/ pump was found to be biphasic following exposure to phenylephrine (PE), an alpha-1 agonist. Stimulation (35%) was present over the first two minutes, while activity was inhibited over the interval of 5 to 10 minutes of continued PE exposure. Both phases were blocked by prazosin. The influence of DAG and protein kinase C (PKC) in alpha-1 receptor modulation of the Na/sup +/ pump was studied by employing 4-beta-phorbol (PMA), a phorbol ester which activates PKC. Perfusion of livers with PMA in situ or incubation with slices yielded inhibition of ATPase activity in membranes and /sup 86/Rb uptake in that was qualitatively and quantitatively similar to PE. These results suggest cations may influence receptor function in vivo and in vitro and the inhibitory effects of PE on the sodium pump may be mediated through PKC.

  16. Estrogenic activity of styrene oligomers after metabolic activation by rat liver microsomes.

    Science.gov (United States)

    Kitamura, Shigeyuki; Ohmegi, Motoko; Sanoh, Seigo; Sugihara, Kazumi; Yoshihara, Shin'ichi; Fujimoto, Nariaki; Ohta, Shigeru

    2003-01-01

    In this study we examined estrogenic activity of styrene oligomers after metabolic activation by rat liver microsomes. Trans-1,2-diphenylcyclobutane (TCB), cis-1,2-diphenylcyclobutane (CCB), 1,3-diphenylpropane, 2,4-diphenyl-1-butene, 2,4,6-triphenyl-1-hexene, and 1-alpha-phenyl-4ss-(1 -phenylethyl)tetralin were negative in the yeast estrogen screening assay and estrogen reporter assay using estrogen-responsive human breast cancer cell line MCF-7. However, TCB exhibited estrogenic activity after incubation with liver microsomes of phenobarbital-treated rats in the presence of reduced nicotinamide adenine dinucleotide phosphate (NADPH). Minor activity was observed when liver microsomes of untreated or 3-methylcholanthrene-treated rats were used instead of those from phenobarbital-treated rats. CCB, 1,3-diphenylpropane, and 2,4-diphenyl-1-butene also exhibited estrogenic activity after metabolic activation by liver microsomes, but the activity was lower than that of TCB. 2,4,6-Triphenyl-1-hexene and 1-alpha-phenyl-4ss-(1 -phenylethyl)tetralin did not show estrogenic activity after such incubation. When TCB was incubated with liver microsomes of phenobarbital-treated rats in the presence of NADPH, three metabolites were detected by high-performance liquid chromatography (HPLC). One metabolite isolated by HPLC exhibited a significant estrogenic activity. The active metabolite was identified as trans-1-(4-hydroxyphenyl)-2-phenylcyclobutane by mass and nuclear magnetic resonance spectral analysis. These results suggest that the estrogenic activity of TCB was caused by the formation of the 4-hydroxylated metabolite. PMID:12611662

  17. Effects of Insulin Treatment on Intracellular Lipid Metabolism in Liver of Diabetic Rats

    Institute of Scientific and Technical Information of China (English)

    CHEN Lulu; WANG Yongbo; ZHOU Min; WANG Baoping

    2006-01-01

    The effects and the mechanism of insulin treatment on intracellular lipid metabolism in liver of diabetic rats were evaluated. Type 2 diabetic rats were induced by injecting the streptozotocin (25 mg/kg) and fat rich food. According to the results of oral glucose tolerance test (OGTT)and glucose-induced insulin secretion test (IRT), the rats were divided into two groups: untreated group (UT) and insulin-treated group (IT). Normal rats (NC) served as controls. The treatment with either Humulin N (4-6 U/kg every day), or saline lasted for 4 weeks. Body weight, OGTT,IRT, blood lipids, intracellular lipids in liver, hepatic fatty acid oxidation and the activity of fatty acid synthase (FAS) were detected. The change of liver histology was observed. The insulin sensitivity index (ISI) was applied to assess the status of insulin resistance. The results showed that as compared with NC group, the plasma and hepatic intracellular Triglyceride (TG), total cholesterol (TC) and free fatty acids (FFAs) were increased significantly in UT group (P<0.05), and lipid droplets could be seen dispersedly in the liver specimens, the hepatic fatty acid oxidation was increased markedly (P<0.05), while the fatty acid synthase activity decreased (P<0.05). Insulin treatment resulted in a further accumulation of lipids in liver by 55.7 %, 19.87 % and 22.2 % increase in TG, TC, FFAs respectively. The size of hepatocytes was enlarged and the cells were filled with fat drops. Plasma lipids showed little decrease and still significantly higher than those in NC group after the insulin treatment. Meanwhile, insulin treatment was companied by 20 % decrease in the rate of fatty acid oxidation and 31% increase in hepatic FAS activity compared to UT group. It was concluded that treatment with insulin on type 2 diabetic rat increases hepatic intracellular lipid accumulation by inhibiting hepatic fatty acid oxidation and activating FAS.

  18. EFFECT OF THIOPROPANOL ON AMINO ACID TURNOVER AND REDOX STATUS IN ALLOXAN DIABETIC RAT LIVER

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    Vickram

    2016-07-01

    Full Text Available BACKGROUND Decreased cellular thiol levels seen in diabetes mellitus (DM may be in part attributed to increased free radical generation. The free radical mediated oxidative stress has been implicated in the pathogenesis of DM and its complications. The relative deficiency or non-availability of insulin in DM affects the metabolism of biomolecules, specifically the carbohydrate metabolism. The insulin-mimicking actions of various thiols have been studied. In our previous study, we have documented that 3-mercapto- 1-propanol (Thiopropanol, a low molecular weight thiol, at the dosage employed has increased glucose utilisation in alloxandiabetic rat liver tissue probably by favouring utilisation of glucose through glycolysis and HMP pathway. It is known that insulin inhibits gluconeogenesis by inhibiting the key enzymes of the same and by controlling the channelling of amino acids for the glucose biosynthesis through gluconeogenic pathway. A study was undertaken to assess the effects of thiopropanol (TP on amino acid turnover and the redox status in alloxan diabetic rat liver. METHODS Male albino rats weighing 150-250 g were used. Diabetes was induced using alloxan monohydrate. Rats were divided into normal and diabetic groups. Levels of amino acid nitrogen (AAN, alanine, total thiol (-SH groups, TBARS (Thiobarbituric acid reactive substances, and activities of alanine transaminase (ALT and aspartate transaminase (AST were estimated in liver specimens of normal, control-alloxan diabetic and TP-exposed-alloxan-diabetic rats. RESULTS The results showed a significant increase (p<0.001 in AAN levels, alanine levels, and total -SH groups concentration; and a significant decrease (p<0.001 in TBARS levels, ALT and AST activities in TP-exposed-alloxan diabetic liver slices as compared to control-alloxan diabetic liver slices. CONCLUSIONS Hence, it may be concluded that TP, at the concentration employed, inhibits gluconeogenesis from amino acids probably by

  19. Accumulation of polychlorinated dibenzo-p-dioxins and dibenzofurans in liver of control laboratory rats.

    Science.gov (United States)

    Vanden Heuvel, J P; Clark, G C; Tritscher, A m; Lucier, G W

    1994-10-01

    Polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), and biphenyls belong to a class of compounds, the polyhalogenated aromatic hydrocarbons (PHAHs), which are ubiquitous environmental contaminants. Due to the existence of a common mechanism of action, i.e., binding to the Ah receptor, the activity of members of this class of compounds is generally expressed relative to the prototypical 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) as toxic equivalency factors (TEFs). In the present studies we examined the presence of liver of untreated PCDFs in standard laboratory feed and in the liver of untreated rats at three different ages (60, 140, and 200 days) in terms of concentration and in toxic equivalents (TEQs, TEF x concentration). Feed was shown to contain trace amounts of PCDDs and PCDFs and control rat liver was shown to contain several PCDD and PCDF congeners in terms of concentration of congener and concentration of TEQs contributed by that congener. The total concentration of TEQs increased with increasing age in rat liver, going from 20 ppt TEQ at 60 days to 78 ppt TEQ at 200 days of age. This accumulation in dioxin-like activity was due primarily to PCDFs. In particular the congener 2,3,4,7,8-pentachlorodibenzofuran accrued in untreated rat liver accounting for approximately 80% of the total TEQ at 200 days of age. These studies affirm the pervasive presence of PHAHs and suggest prudence in evaluating chronic rat studies in which interference from background levels of PCDDs and PCDFs may be a factor.

  20. Hepatic iron deprivation prevents spontaneous development of fulminant hepatitis and liver cancer in Long-Evans Cinnamon rats.

    Science.gov (United States)

    Kato, J; Kobune, M; Kohgo, Y; Sugawara, N; Hisai, H; Nakamura, T; Sakamaki, S; Sawada, N; Niitsu, Y

    1996-08-15

    Several clinical studies have suggested that excess hepatic iron accumulation is a progressive factor in some liver diseases including chronic viral hepatitis and hemochromatosis. However, it is not known whether iron-induced hepatotoxicity may be directly involved in hepatitis, cirrhosis, and liver cancer. The Long-Evans Cinnamon (LEC) rat, which accumulates excess copper in the liver as in patients with Wilson's disease, is of a mutant strain displaying spontaneous hemolysis, hepatitis, and liver cancer. We found previously that LEC rats harbored an additional abnormality: accumulation of as much iron as copper in the liver. In the present study, we compared the occurrence of hepatitis and liver cancer in LEC rats fed an iron-deficient diet (ID) with those in rats fed a regular diet (RD). The RD group showed rapid increments of hepatic iron concentrations as the result of hemolysis, characteristics of fulminant hepatitis showing apoptosis, and a 53% mortality rate. However, no rats in the ID group died of fulminant hepatitis. Hepatic iron, especially "free" iron concentration and the extent of hepatic fibrosis in the ID group were far less than those of the RD group. At week 65, all rats in the RD group developed liver cancer, whereas none did in the ID group. These results suggest that the accumulation of iron, possibly by virtue of synergistic radical formation with copper, plays an essential role in the development of fulminant hepatitis, hepatic fibrosis, and subsequent hepatocarcinogenesis in LEC rats.

  1. Non-alcoholic steatohepatitis and preneoplastic lesions develop in the liver of obese and hypertensive rats: suppressing effects of EGCG on the development of liver lesions.

    Science.gov (United States)

    Kochi, Takahiro; Shimizu, Masahito; Terakura, Daishi; Baba, Atsushi; Ohno, Tomohiko; Kubota, Masaya; Shirakami, Yohei; Tsurumi, Hisashi; Tanaka, Takuji; Moriwaki, Hisataka

    2014-01-01

    Non-alcoholic steatohepatitis (NASH), which involves hepatic inflammation and fibrosis, is associated with liver carcinogenesis. The activation of the renin-angiotensin system (RAS), which plays a key role in blood pressure regulation, promotes hepatic fibrogenesis. In this study, we investigated the effects of (-)-epigallocatechin-3-gallate (EGCG), a major component of green tea catechins, on the development of glutathione S-transferase placental form (GST-P)-positive (GST-P(+)) foci, a hepatic preneoplastic lesion, in SHRSP.Z-Lepr(fa)/IzmDmcr (SHRSP-ZF) obese and hypertensive rats. Male 7-week-old SHRSP-ZF rats and control non-obese and normotensive WKY rats were fed a high fat diet and received intraperitoneal injections of carbon tetrachloride twice a week for 8weeks. The rats were also provided tap water containing 0.1% EGCG during the experiment. SHRSP-ZF rats presented with obesity, insulin resistance, dyslipidemia, an imbalance of adipokines in the serum, and hepatic steatosis. The development of GST-P(+) foci and liver fibrosis was markedly accelerated in SHRSP-ZF rats compared to that in control rats. Additionally, in SHRSP-ZF rats, RAS was activated and inflammation and oxidative stress were induced. Administration of EGCG, however, inhibited the development of hepatic premalignant lesions by improving liver fibrosis, inhibiting RAS activation, and attenuating inflammation and oxidative stress in SHRSP-ZF rats. In conclusion, obese and hypertensive SHRSP-ZF rats treated with a high fat diet and carbon tetrachloride displayed the histopathological and pathophysiological characteristics of NASH and developed GST-P(+) foci hepatic premalignant lesions, suggesting the model might be useful for the evaluation of NASH-related liver tumorigenesis. EGCG might also be able to prevent NASH-related liver fibrosis and tumorigenesis. Copyright © 2013 Elsevier Ireland Ltd. All rights reserved.

  2. [Effect of space flight on the Kosmos-1129 biosatellite on enzyme activity of the rat liver].

    Science.gov (United States)

    Nemeth, S; Tigranian, R A

    1983-01-01

    After the 18.5 day Cosmos-1129 flight the activity of 7 glucocorticoid-stimulated enzymes of the rat liver was measured. Immediately postflight the activity of tyrosine aminotransferase, tryptophan pyrolase and serine dehydrogenase increased. These enzymes rapidly (within several hours) react to increased glucocorticoids. The activity of aspartate and alanine aminotransferases also increased. These enzymes require many days of a continuous effect of glucocorticoids. The glycogen concentration in the rat liver also grew. At R + 6 the activity of tryptophan pyrolase and serine dehydrogenase decreased and that of the other enzymes returned to normal. The immobilization stress applied postflight led to an increased activity of tyrosine aminotransferase and tryptophan pyrolase. This study gives evidence that after space flight rats are in an acute stress state, evidently, produced by the biosatellite recovery.

  3. Protective effects of tumor necrosis factor antibody and ulinastatin on liver ischemic reperfusion in rats

    Institute of Scientific and Technical Information of China (English)

    Yan-Ling Yang; Ji-Peng Li; Xiao-Ping Xu; Ke-Feng Dou; Shu-Qiang Yue; Kai-Zong Li

    2004-01-01

    AIM: To study the protective effects of tumor necrosis factor α(TNFα) antibody and ulinastatin on liver ischemic reperfusion in rats.METHODS: One hundred and twenty male SD rats were randomly divided into four groups: normal control group,ischemic group, TNFα antibody group and TNFα antibody + ulinastatin group. The animals were killed at 0, 3, 6, 9,12 h after ischemia for 60 min and followed by reperfusion.Serum alanine aminotransferase (ALT), malondialdehyde (MDA) and liver histopathology were observed.RESULTS: After ischemic reperfusion, the serum ALT and MDA were remarkably increased, and the hepatic congestion was obvious. Treatment of TNFα antibody and ulinastatin could significantly decrease serum ALT and MDA levels,and relieve hepatic congestion.CONCLUSION: Ulinastatin and TNFα antibody can suppress the inflammatory reaction induced by hepatic ischemic reperfusion, and have protective effects on rat hepatic ischemic reperfusion injury.

  4. Induction of xanthine oxidase activity, endoplasmic reticulum stress and caspase activation by sodium metabisulfite in rat liver and their attenuation by Ghrelin.

    Science.gov (United States)

    Ercan, Sevim; Kencebay, Ceren; Basaranlar, Goksun; Derin, Narin; Aslan, Mutay

    2015-02-01

    Sodium metabisulfite is used as a preservative in many food preparations but can oxidize to sulfite radicals initiating molecular oxidation. Ghrelin is a peptide hormone primarily produced in the stomach and has anti-inflammatory and anti-oxidant effects on gastrointestinal and cardiovascular systems. This study was performed to elucidate the effect of ghrelin on sulfite-induced endoplasmic reticulum (ER) stress and caspase activation in rat peripheral organs. Xanthine oxidase (XO), xanthine dehydrogenase (XDH) enzyme activities, ER stress markers [phosphorylated PKR-like ER kinase (pPERK); C/EBP-homologous protein (CHOP)], caspase-3, -8, -9 activities, nuclear factor kappa-B (NF-κB) levels were determined in liver, heart and kidney of rats treated with sodium metabisulfite and/or ghrelin for 5 weeks. Sodium metabisulfite treatment significantly elevated XO activity, induced expression of GRP78, CHOP and increased caspase-3, -8 and -9 activities in liver but had no significant effect in heart and kidney. Ghrelin treatment decreased XO activity to baseline levels and attenuated ER stress and caspase activation in liver tissue of sodium metabisulfite treated rats. In conclusion, metabolism of sodium metabisulfite in liver tissue increased XO activity, induced ER stress and caused caspase activation which was attenuated by ghrelin treatment. Ghrelin's hepatoprotective effect could be through modulation of XO activity.

  5. Dietary Nucleotides Supplementation and Liver Injury in Alcohol-Treated Rats: A Metabolomics Investigation

    Directory of Open Access Journals (Sweden)

    Xiaxia Cai

    2016-03-01

    Full Text Available Background: Previous studies suggested that nucleotides were beneficial for liver function, lipid metabolism and so on. The present study aimed to investigate the metabolic response of dietary nucleotides supplementation in alcohol-induced liver injury rats. Methods: Five groups of male Wistar rats were used: normal control group (basal diet, equivalent distilled water, alcohol control group (basal diet, 50% alcohol (v/v, dextrose control group (basal diet, isocaloric amount of dextrose, and 0.04% and 0.16% nucleotides groups (basal diet supplemented with 0.4 g and 1.6 g nucleotides kg−1 respectively, 50% alcohol (v/v. The liver injury was measured through traditional liver enzymes, expression of oxidative stress markers and histopathological examination. Ultra-performance liquid chromatography quadrupole-time-flight mass spectrometry (UPLC-Q-TOF-MS was applied to identify liver metabolite profiles. Results: Nucleotides supplementation prevented the progression of hepatocyte steatosis. The levels of total proteins, globulin, alanine aminotransferase, aspartate aminotransferase, total cholesterol triglyceride, as well as the oxidative stress markers altered by alcohol, were improved by nucleotides supplementation. Elevated levels of liver bile acids (glycocholic acid, chenodeoxyglycocholic acid, and taurodeoxycholic acid, as well as lipids (stearic acid, palmitic acid, oleic acid, phosphatidylcholine, and lysophosphatidylethanolamine in alcohol-treated rats were reversed by nucleotides supplementation. In addition, supplementation with nucleotides could increase the levels of amino acids, including valyl-Leucine, l-leucine, alanyl-leucine and l-phenylalanine. Conclusion: These data indicate potential biomarkers and confirm the benefit of dietary nucleotides on alcoholic liver injury.

  6. Erythropoietin reduces ischemia-reperfusion injury after liver transplantation in rats.

    Science.gov (United States)

    Schmeding, Maximilian; Hunold, Gerhard; Ariyakhagorn, Veravoorn; Rademacher, Sebastian; Boas-Knoop, Sabine; Lippert, Steffen; Neuhaus, Peter; Neumann, Ulf P

    2009-07-01

    Human recombinant Erythropoietin (rHuEpo) has recently been shown to be a potent protector of ischemia- reperfusion injury in warm-liver ischemia. Significant enhancement of hepatic regeneration and survival after large volume partial hepatic resection has also been demonstrated. It was the aim of this study to evaluate the capacities of rHuEpo in the setting of rat liver transplantation. One-hundred-and-twenty Wistar rats were used: 60 recipients received liver transplantation following donor organ treatment (60 donors) with either 1000 IU rHuEpo or saline injection (controls) into portal veins (cold ischemia 18 h, University of Wisconsin (UW) solution). Recipients were allocated to two groups, which either received 1000 IU rHuEpo at reperfusion or an equal amount of saline (control). Animals were sacrificed at defined time-points (2, 4.5, 24, 48 h and 7 days postoperatively) for analysis of liver enzymes, histology [hematoxylin-eosin (HE) staining, periodic acid Schiff staining (PAS)], immunostaining [terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL), Hypoxyprobe] and real-time polymerase chain reaction (RT-PCR) of cytokine mRNA (IL-1, IL-6). Lactate dehydrogenase (LDH) and alanine aminotransferase (ALT) values were significantly reduced among the epo-treated animals 24 and 48 h after liver transplantation (LT). The TUNEL and Hypoxyprobe analyses as well as necrotic index evaluation displayed significant reduction of apoptosis and necrosis in rHuEpo-treated graft livers. Erythropoietin reduces ischemia-reperfusion injury after orthotopic liver transplantation in rats.

  7. Transformation and action of extracellular NAD+ in perfused rat and mouse livers

    Institute of Scientific and Technical Information of China (English)

    Ana Carla BROETTO-BLAZON; Fabricio BRACHT; Livia BRACHT; Ana Maria KELMER-BRACHT; Adelar BRACHT

    2009-01-01

    Aim: Transformation and possible metabolic effects of extracellular NAD+ were investigated in the livers of mice (Mus mus-culus; Swiss strain) and rats (Rattus novergicus; Holtzman and Wistar strains). Methods: The livers were perfused in an open system using oxygen-saturated Krebs/Henseleit-bicarbonate buffer (pH 7.4) as the perfusion fluid. The transformation of NAD+ was monitored using high-performance liquid chromatography. Results: In the mouse liver, the single-pass metabolism of 100 μmol/L NAD+ was almost complete; ADP-ribose and nicoti-namide were the main products in the outflowing perfusate. In the livers of both Holtzman and Wistar rats, the main trans-formation products were ADP-ribose, uric acid and nicotinamide; significant amounts of inosine and AMP were also iden-tified. On a weight basis, the transformation of NAD+ was more efficient in the mouse liver. In the rat liver, 100 μmol/L NAD+ transiently inhibited gluconeogenesis and oxygen uptake. Inhibition was followed by a transient stimulation. Inhibi-tion was more pronounced in the Wistar strain and stimulation was more pronounced in the Holtzman strain. In the mouse liver, no clear effects on gluconeogenesis and oxygen uptake were found even at 500 μmol/L NAD+. Conclusion: It can be concluded that the functions of extracellular NAD+ are species-dependent and that observations in one species are strictly valid for that species. Interspecies extrapolations should thus be made very carefully. Actually, even variants of the same species can demonstrate considerably different responses.

  8. Effect of Zingiber officinale on fatty liver induced by oxytetracycline in albino rats

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    Eman G.E. Helal* , Samia M. Abd El-Wahab* , Atef M. Moussa Sharaf**

    2012-01-01

    Full Text Available Fatty liver causes were markedly increased in Egyptian people throughout last years. People prefer to use the medicinal plants instead of using chemical compounds because they are cheap and have few side effects compared to chemical compounds. Ginger is a natural dietary rhizome with anti-oxidative, anti-inflammatory, and anti-carcinogenic activities. The aim of this study was to evaluate the possible potential therapeutic and protective effects of Zingiber officinale (ginger against oxytetracyclin-induced fatty liver in an attempt to understand its mechanism of action, which may pave the way for possible therapeutic applications. Material and Methods: Albino rats were divided into two major groups, 15 rats for each. The first group was divided into three sub-groups: a control, b fatty liver group; that was injected intraperitonealy with oxytetracycline (120mg/kg for three consecutive days and c ginger treated group; which was treated with ginger water extract (125 mg/kg for 30 days after fatty liver induction . All animals were scarified after 33 days of the beginning of the experiment. The second group was divided into three subgroups: a control, b fatty liver group; that was injected intraperitonealy with oxytetracycline (120 mg/kg for three consecutive days and c ginger protective group; which received ginger for 15 days before induction of fatty liver, then sacrificed after induction of fatty liver (3 days. Blood samples were collected for biochemical analysis. Liver specimens were obtained and fixed in 10% formalin for histological study. Results: Fatty liver groups showed high significant increase in serum glucose, cholesterol, triglycerides, LDL cholesterol, ALAT, ASAT, GGT, LDH, urea, creatinine and A/G ratio while total protein, albumin, globulin and HDL cholesterol were significantly decreased compared to control group. These biochemical changes were accompanied with histopathological alterations in fatty liver tissue. The treatment

  9. Pretreatment with mangafodipir improves liver graft tolerance to ischemia/reperfusion injury in rat.

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    Ismail Ben Mosbah

    Full Text Available Ischemia/reperfusion injury occurring during liver transplantation is mainly due to the generation of reactive oxygen species (ROS upon revascularization. Thus, delivery of antioxidant enzymes might reduce the deleterious effects of ROS and improve liver graft initial function. Mangafodipir trisodium (MnDPDP, a contrast agent currently used in magnetic resonance imaging of the liver, has been shown to be endowed with powerful antioxidant properties. We hypothesized that MnDPDP could have a protective effect against liver ischemia reperfusion injury when administrated to the donor prior to harvesting. Livers from Sprague Dawley rats pretreated or not with MnDPDP were harvested and subsequently preserved for 24 h in Celsior® solution at 4°C. Organs were then perfused ex vivo for 120 min at 37°C with Krebs Henseleit solution. In MnDPDP (5 µmol/kg group, we observed that ATP content was significantly higher at the end of the cold preservation period relative to untreated group. After reperfusion, livers from MnDPDP-treated rats showed better tissue integrity, less hepatocellular and endothelial cell injury. This was accompanied by larger amounts of bile production and higher ATP recovery as compared to untreated livers. The protective effect of MnDPDP was associated with a significant decrease of lipid peroxidation, mitochondrial damage, and apoptosis. Interestingly, MnDPDP-pretreated livers exhibited activation of Nfr2 and HIF-1α pathways resulting in a higher catalase and HO-1 activities. MnDPDP also increased total nitric oxide (NO production which derived from higher expression of constitutive NO synthase and lower expression of inducible NO synthase. In conclusion, our results show that donor pretreatment with MnDPDP protects the rat liver graft from cold ischemia/reperfusion injury and demonstrate for the first time the potential interest of this molecule in the field of organ preservation. Since MnDPDP is safely used in liver imaging

  10. Surgical procedures for a rat model of partial orthotopic liver transplantation with hepatic arterial reconstruction.

    Science.gov (United States)

    Nagai, Kazuyuki; Yagi, Shintaro; Uemoto, Shinji; Tolba, Rene H

    2013-03-07

    Orthotopic liver transplantation (OLT) in rats using a whole or partial graft is an indispensable experimental model for transplantation research, such as studies on graft preservation and ischemia-reperfusion injury, immunological responses, hemodynamics, and small-for-size syndrome. The rat OLT is among the most difficult animal models in experimental surgery and demands advanced microsurgical skills that take a long time to learn. Consequently, the use of this model has been limited. Since the reliability and reproducibility of results are key components of the experiments in which such complex animal models are used, it is essential for surgeons who are involved in rat OLT to be trained in well-standardized and sophisticated procedures for this model. While various techniques and modifications of OLT in rats have been reported since the first model was described by Lee et al. in 1973, the elimination of the hepatic arterial reconstruction and the introduction of the cuff anastomosis technique by Kamada et al. were a major advancement in this model, because they simplified the reconstruction procedures to a great degree. In the model by Kamada et al., the hepatic rearterialization was also eliminated. Since rats could survive without hepatic arterial flow after liver transplantation, there was considerable controversy over the value of hepatic arterialization. However, the physiological superiority of the arterialized model has been increasingly acknowledged, especially in terms of preserving the bile duct system and the liver integrity. In this article, we present detailed surgical procedures for a rat model of OLT with hepatic arterial reconstruction using a 50% partial graft after ex vivo liver resection. The reconstruction procedures for each vessel and the bile duct are performed by the following methods: a 7-0 polypropylene continuous suture for the supra- and infrahepatic vena cava; a cuff technique for the portal vein; and a stent technique for the

  11. Sesamin ameliorates oxidative liver injury induced by carbon tetrachloride in rat.

    Science.gov (United States)

    Lv, Dan; Zhu, Chang-Qing; Liu, Li

    2015-01-01

    Sesamin is naturally occurring lignan from sesame oil with putative antioxidant property. The present study was designed to investigate the protective role of sesamin against carbon tetrachloride induced oxidative liver injury. Male Wistar albino rats (180-200 g) were divided in to 5 groups (n=6). Hepatotoxicity was induced by the administration of CCl4 (0.1 ml/100 g bw., 50% v/v with olive oil) intraperitoneally. Sesamin was administered in two different dose (5 and 10 ml/kg bw) to evaluate the hepatoprotective activity. Sesamin significantly reduced the elevated serum liver marker enzymes (Psesamin treated groups shows the amelioration of oxidative stress induced by CCl4. Histopathological report also supported the hepatoprotection offered by sesamin. Sesamin effects in both the dose were in comparable to reference standard drug silymarin. From these above findings it has been concluded that sesamin ameliorate the oxidative liver injury in terms of reduction of lipid peroxidation and enhancement of liver antioxidant enzymes.

  12. Studies on the effect of dietary protein and fat content upon DDT metabolism in rat liver.

    Science.gov (United States)

    Ando, M

    1982-07-01

    Rats were supplied with 25 kinds of food, which were divided into 5 classes of protein and 5 classes of fat content, to examine the effect of dietary protein and fat on the metabolism and retention of DDT in the liver. The results suggested that dietary protein and fat changed DDT and its metabolites concentration in liver. The concentration of DDT decreases according to the increase of dietary protein content. The concentration of DDT and its metabolites in liver increases when the dietary fat content increases. Polynomial and multiple regression analyses were carried out to confirm the effect of dietary protein and fat on DDT metabolism. The results suggest that the residual concentration of DDT and its metabolites (DDD and DDE) is a function of dietary protein and fat content, and can be represented in equation form. The estimation of the concentration of DDT and its metabolites from the equation agrees well with the measured concentration in liver.

  13. Analysis of hormone-induced changes of phosphoinositide metabolism in rat liver

    Energy Technology Data Exchange (ETDEWEB)

    Wallace, M.A.; Fain, J.N.

    1985-01-01

    The relationship between hormone-stimulated phosphoinositide turnover and Ca/sup 2 +/ flux can be investigated using radiolabelled hepatocytes and the subcellular fractions derived from them or from whole liver. Comparison of the results obtained using intact cells to those from subcellular fractions should ultimately lead to a reconstruction of the transmembrane signaling events through which hormone such as vasopressin, angiotensin, and catecholamines acutely activate liver glycogenolysis. The paper reviews hormone-stimulated phosphoinositide metabolism in intact hepatocytes as well as hepatic enzymes involved in phosphoinositide metabolism. Also discussed is the current status of studies on hormone action in broken cell preparations in liver.

  14. Epigallocatechin-3-Gallate Ameliorates Alcohol-Induced Liver Injury in Rats

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    Xi Li

    2006-07-01

    Full Text Available Endotoxemia is a common event in alcoholic liver disease. Elevated intestinalpermeability is the major factor involved in the mechanism of alcoholic endotoxemia andthe pathogenesis of alcoholic liver disease. This study examined the effect ofepigallocatechin-3-gallate (EGCG on alcohol-induced gut leakiness, and explored therelated mechanisms involved in its protection against alcohol-induced liver injury in rats.Four groups of female Sprague-Dawley rats were studied. Alcohol and alcohol/EGCGgroups rats received fish oil along with alcohol daily via gastrogavage for 6 weeks, anddextrose and dextrose/EGCG groups rats were given fish oil along with isocaloric dextroseinstead of alcohol. The dextrose/EGCG and alcohol/EGCG groups received additionaltreatment of EGCG (100mg.kg-1 body weight daily intragastrically by gavage. Intestinalpermeability was assessed by urinary excretion of lactulose and mannitol (L/M ratio. Liverinjury was evaluated histologically and by serum alanine aminotransferase (ALT. Plasmaendotoxin and serum tumor necrosis factor-α (TNF-α levels were assayed; livermalondialdehyde (MDA contents determined. CD14 and inflammatory factors, such asTNF-α, cyclooxygenase-2 (COX-2 and inducible nitric oxide synthase (iNOS mRNAs inthe liver were analyzed by reverse transcriptase-polymerase chain reaction (RT-PCR. Ratsgiven fish oil plus alcohol had gut leakiness (L/M ratio was increased, which wasassociated with both endotoxemia and liver injury. The above responses were accompaniedby increased CD14, TNF-α, COX-2 and iNOS mRNA expressions in the liver. EGCGsupplementation partly blocked the gut leakiness, reduced endotoxemia and lipidperoxidation, and blunted the elevated expressions of CD14, TNF-α, COX-2 and iNOS, allof which were associated with improved liver injury. These results show that EGCG can block alcohol-induced gut leakiness, reduce endotoxemia, and inhibit inflammatory factors expressions in

  15. Gene and protein expressions of P28gank in rat with liver regeneration

    Institute of Scientific and Technical Information of China (English)

    Jian-Min Qin; Xiao-Yong Fu; Shen-Jing Li; Shu-Qin Liu; Jin-Zhang Zeng; Xiu-Hua Qiu; Meng-Chao Wu; Hong-Yang Wang

    2003-01-01

    AIM: To observe the gene and protein expression changes of p28GANK in regenerating liver tissues, and to reveal the biological function of p28GANK on the regulation of liver regeneration.METHODS: One hundred and thirty two adult male Sprague-Dawley rats were selected, weighing 200-250 g,and divided randomly into sham operation (SO) group and partial hepatectomy (PH) group. Each group had eleven time points: 0, 2, 6, 12, 24, 30, 48, 72, 120, 168 and 240 h,six rats were in each time point. The rats were undergone 70 % PH under methoxyflurane anesthesia by resection of the anterior and left lateral lobes of the liver. SO was conducted by laparotomy plus slight mobilization of the liver without resection. Liver specimens were collected at the indicated time points after PH or SO. The expression level of p28GANK mRNA was determined by Northern blot as well as at protein level via immunohistochemical staining.The expressions of p28GANK mRNA in these tissues were analyzed by imaging analysis system of FLA-2000 FUJIFILM and one way analysis of variance. The protein expressions of p28GANK in these tissues were analyzed with Fromowitz'method and Rank sum test.RESULTS: The expression of p28GANK mRNA in bhe regenerating liver tissues possessed two transcripts, which were 1.5 kb and 1.0 kb. There was a significantly different expression patterns of p28GANK mRNA between SO and PH groups (P<0.01). The expression of p28GANK mRNA increased 2 h after PH, the peak time was 72 h (SO group: 163.83±1.4720; PH group: 510.5±17.0499, P<0.01). There was a significant difference in the 1.5 kb transcript, which decreased gradually after 72 hours. The protein expression of p28GANK was mainly in the cytoplasm of regenerating hepatocytes, and increased near the central region 24 h after PH, and became strongly positive at 48 h (+++, vs the other time points P<0.05),but decreased 72 h after PH.CONCLUSION: The expression of p28GANK mRNA increases in the early stage of rat liver regeneration, the

  16. Proteomic Analysis of the Effect of Fuzheng Huayu Recipe on Fibrotic Liver in Rats

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    Hongdong Xie

    2013-01-01

    Full Text Available Hepatic fibrosis is a common pathological process of chronic liver diseases and would lead to cirrhosis, and Fuzheng Huayu (FZHY is an effective Chinese herbal product against liver fibrosis. This study observes FZHY influence on proteome of fibrotic liver with differential proteomic approach and aims to understand FZHY multiple action mechanisms on liver fibrosis. The liver fibrosis models were induced with intraperitoneal injection of dimethylnitrosamine for 4 weeks in rats and divided into model control (model and FZHY-treated (FZHY groups, while normal rats were used as normal control (normal. After model establishment, rats in FZHY groups were administered 4 g/kg wt of FZHY for 4 weeks, and normal and model groups were given the same volume of saline. The liver proteins in the above 3 groups were separated by two-dimensional gel electrophoresis (2-DE, the differentially expressed spots were analyzed and compared between normal and model or model and FZHY groups, and then the proteins were identified with mass spectrum analysis and validated partially with western blot and real-time PCR. 1000~1200 spots were displayed on each 2D gel, and a total of 61 protein spots were found with significant intensity difference between normal control or FZHY and model control. 23 most obviously differential spots were excised, and in-gel digestion and 21 peptide mass fingerprints (PMF were obtained with MALDI-TOF MS analysis, and 14 proteins were identified through protein database searching. Among 14 differentially expressed proteins, 8 proteins in normal and FZHY groups had the same tendency of differential expression compared with the ones in model group. And one of them, vimentin, was validated by western blot and real-time PCR analyses. Our study reveals 12 proteins responsible for fibrogenesis induced by DMN in rats, and among them, 8 proteins in fibrotic liver were regulated by FZHY, including aldehyde dehydrogenase, vimentin isoform (CRA_b, gamma

  17. Omega-3 polyunsaturated fatty acids promote liver regeneration after 90% hepatectomy in rats

    Institute of Scientific and Technical Information of China (English)

    Yu-Dong Qiu; Sheng Wang; Yue Yang; Xiao-Peng Yan

    2012-01-01

    AIM:To evaluate the effectiveness of omega-3 polyunsaturated fatty acid (ω-3 PUFA) administration on liver regeneration after 90% partial hepatectomy (PH) in METHODS:ω-3 PUFAs were intravenously injected in the ω-3 PUFA group before PH surgery.PH,sparing only the caudate lobe,was performed in both the control and the ω-3 PUFA group.Survival rates,liver weight/body weight ratios,liver weights,HE staining,transmission electron microscope imaging,nuclearassociated antigen Ki-67,enzyme-linked immunosorbent assay and signal transduction were evaluated to analyze liver regeneration.RESULTS:All rats in the control group died within 30 h after hepatectomy.Survival rates in the ω-3 PUFA group were 20/20 at 30 h and 4/20 1 wk after PH.Liver weight/body weight ratios and liver weights increased significantly in the ω-3 PUFA group.The structure of sinusoidal endothelial cells and space of Disse was greatly restored in the ω-3 PUFA group compared to the control group after PH.In the ω-3 PUFA group,interleukin (IL)-4 and IL-10 levels were significantly increased whereas IL-6 and tumor necrosis factor-α levels were dramatically decreased.In addition,activation of protein kinase B (Akt) and of signal transducer and activator of transcription 3 signaling pathway were identified at an earlier time after PH in the ω-3 PUFA group.CONCLUSION:Omega-3 polyunsaturated fatty acids may prevent acute liver failure and promote liver regeneration after 90% hepatectomy in rats.

  18. Identification of differentially expressed genes after partial rat liver ischemia/reperfusion by suppression subtractive hybridization

    Institute of Scientific and Technical Information of China (English)

    Christine Fallsehr; Christina Zapletal; Michael Kremer; Resit Demir; Magnus von Knebel Doeberitz; Ernst Klar

    2005-01-01

    AIM: To identify potential diagnostic target genes in early reperfusion periods following warm liver ischemia before irreversible liver damage occurs.METHODS: We used two strategies (SSH suppression subtractive hybridization and hybridization of cDNA arrays)to determine early changes in gene expression profiles in a rat model of partial WI/R, comparing postischemic and adjacent nonischemic liver lobes. Differential gene expression was verified (WT/R; 1 h/2 h) and analyzed in more detail after warm ischemia (1 h) in a reperfusion time kinetics (0, 1, 2 and 6 h) and compared to untreated livers by Northern blot hybridizations. Protein expression was examined on Western blots and by immunohistochemistry for four differentially expressed target genes (Hsp70,Hsp27, Gadd45a and IL-1rl).RESULTS: Thirty-two individual WI/R target genes showing altered RNA levels after confirmation by Northern blot analyzes were identified. Among them, six functionally uncharacteristic expressed sequences and 26 known genes (12 induced in postischemic liver lobes, 14 with higher transcriptional expression in adjacent nonischemic liver lobes). Functional categories of the verified marker genes indicate on the one hand cellular stress and tissue damage but otherwise activation of protective cellular reactions (AP-1 transcription factors, apoptosis related genes, heat shock genes). In order to assign the transcriptional status to the biological relevant protein level we demonstrated that Hsp70, Hsp27, Gadd45a and IL-1rI were clearly up-regulated comparing postischemic and untreated rat livers, suggesting their involvement in the WI/R context.CONCLUSION: This study unveils a WI/R response gene set that will help to explore molecular pathways involved in the tissue damage after WI/R. In addition, these genes especially Hsp70and Gadd45a might represent promising new candidates indicating WI/R liver damage.

  19. Protective effect of nitric oxide induced by