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Cavalcante FP, Coelho AMM, Machado MCC, Sampietre SN, Patzina RA, Diniz MA, Chaib E, D'Albuquerque LAC. Mechanisms of the beneficial effect of sevoflurane in liver ischemia/reperfusion injury. Acta Cir Bras 2015; 30:749-55. [DOI: 10.1590/s0102-865020150110000005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Accepted: 10/19/2015] [Indexed: 11/22/2022] Open
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Stefano JT, Pereira IVA, Torres MM, Bida PM, Coelho AMM, Xerfan MP, Cogliati B, Barbeiro DF, Mazo DFC, Kubrusly MS, D'Albuquerque LAC, Souza HP, Carrilho FJ, Oliveira CP. Sorafenib prevents liver fibrosis in a non-alcoholic steatohepatitis (NASH) rodent model. ACTA ACUST UNITED AC 2015; 48:408-14. [PMID: 25714891 PMCID: PMC4445663 DOI: 10.1590/1414-431x20143962] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Accepted: 11/12/2014] [Indexed: 12/11/2022]
Abstract
Liver fibrosis occurring as an outcome of non-alcoholic steatohepatitis (NASH) can
precede the development of cirrhosis. We investigated the effects of sorafenib in
preventing liver fibrosis in a rodent model of NASH. Adult Sprague-Dawley rats were
fed a choline-deficient high-fat diet and exposed to diethylnitrosamine for 6 weeks.
The NASH group (n=10) received vehicle and the sorafenib group (n=10) received 2.5
mg·kg-1·day-1 by gavage. A control group (n=4) received only
standard diet and vehicle. Following treatment, animals were sacrificed and liver
tissue was collected for histologic examination, mRNA isolation, and analysis of
mitochondrial function. Genes related to fibrosis (MMP9,
TIMP1, TIMP2), oxidative stress
(HSP60, HSP90, GST), and
mitochondrial biogenesis (PGC1α) were evaluated by real-time
quantitative polymerase chain reaction (RT-qPCR). Liver mitochondrial oxidation
activity was measured by a polarographic method, and cytokines by enzyme-linked
immunosorbent assay (ELISA). Sorafenib treatment restored mitochondrial function and
reduced collagen deposition by nearly 63% compared to the NASH group. Sorafenib
upregulated PGC1α and MMP9 and reduced
TIMP1 and TIMP2 mRNA and IL-6 and IL-10 protein
expression. There were no differences in HSP60,
HSP90 and GST expression. Sorafenib modulated
PGC1α expression, improved mitochondrial respiration and
prevented collagen deposition. It may, therefore, be useful in the treatment of liver
fibrosis in NASH.
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Affiliation(s)
- J T Stefano
- Disciplina de Gastroenterologia Clínica (LIM-07), Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil
| | - I V A Pereira
- Disciplina de Gastroenterologia Clínica (LIM-07), Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil
| | - M M Torres
- Disciplina de Gastroenterologia Clínica (LIM-07), Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil
| | - P M Bida
- Disciplina de Gastroenterologia Clínica (LIM-07), Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil
| | - A M M Coelho
- Disciplina de Transplante de Órgãos do Aparelho Digestivo (LIM-37), Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil
| | - M P Xerfan
- Disciplina de Gastroenterologia Clínica (LIM-07), Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil
| | - B Cogliati
- Departamento de Patologia, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, SP, Brasil
| | - D F Barbeiro
- Disciplina de Emergências Clínicas (LIM-51), Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil
| | - D F C Mazo
- Disciplina de Gastroenterologia Clínica (LIM-07), Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil
| | - M S Kubrusly
- Disciplina de Transplante de Órgãos do Aparelho Digestivo (LIM-37), Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil
| | - L A C D'Albuquerque
- Disciplina de Transplante de Órgãos do Aparelho Digestivo (LIM-37), Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil
| | - H P Souza
- Disciplina de Emergências Clínicas (LIM-51), Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil
| | - F J Carrilho
- Disciplina de Gastroenterologia Clínica (LIM-07), Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil
| | - C P Oliveira
- Disciplina de Gastroenterologia Clínica (LIM-07), Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil
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Penido A, Coelho AMM, Molan NT, Silva FPD, D'Albuquerque LAC, Machado MCC. Do opioid receptors play a role in the pathogenesis of the inflammatory response in acute pancreatitis? Acta Cir Bras 2013; 27:600-5. [PMID: 22936083 DOI: 10.1590/s0102-86502012000900002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Accepted: 07/11/2012] [Indexed: 11/21/2022] Open
Abstract
PURPOSE To investigate the effect of the opioid blocker naltrexone in the inflammatory response in acute pancreatitis (AP). METHODS Acute pancreatitis was induced in anesthetized male Wistar rats by retrograde injection of 2.5% sodium taurocholate diluted in 0.5ml saline into the main pancreatic duct. Animals were randomized to the following experimental groups: Control Group (n=9): animals received an intraperitoneal injection of saline solution (0.5ml), 15 minutes before the induction of AP. Naltrexone Group (n=9): animals received an intraperitoneal injection of naltrexone 0.5ml (15 mg/kg), 15 minutes before induction of AP. Peritoneal levels of TNF-α and serum levels of IL-6 and amylase were determined The volume of the ascitic fluid was also evaluated. Myeloperoxidase (MPO) activities were analyzed in homogenates of pulmonary tissue. RESULTS There were no significant differences in the ascitic fluid volume, nor in TNF-a and IL-6 levels in the naltrexone group compared to controls. Treatment with naltrexone did not affect the lung MPO activity compared to control group. CONCLUSIONS The opioid receptors don't play an important role in the pathogenesis of the inflammatory response in acute pancreatitis. If opioids affect leukocytes inflammatory signaling, there are no major implications in the pathogenesis of acute pancreatitis.
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Affiliation(s)
- Artur Penido
- School of Medicine, Alfenas University (UNIFENAS), MG, Brazil
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Abdo EE, Coelho AMM, Patzina RA, Sampietre SN, Cunha JEM, Machado MCC, D'Albuquerque LAC. Nitric oxide synthase inhibition reduces albumin induced lung damage in acute pancreatitis. Pancreatology 2013; 13:225-9. [PMID: 23719592 DOI: 10.1016/j.pan.2013.04.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Revised: 04/03/2013] [Accepted: 04/04/2013] [Indexed: 12/11/2022]
Abstract
BACKGROUND/OBJECTIVES Colloid resuscitation in acute pancreatitis (AP) is a matter of controversy due to the possible deleterious effect on lung function. A previous study demonstrates that albumin administration increases lung damage in burns and this effect can be reversed by inducible nitric oxide synthase (iNOS) inhibition. This study evaluates the effects of S-methylisothiourea (SMT), a specific iNOS inhibitor, on lungs and pancreas of rats with AP receiving intravenous albumin. METHODS AP was induced in Wistar rats by intraductal 5% taurocholate injection. To evaluate the effect of albumin on lung damage, animals received IV saline or human albumin immediately after AP (Groups: Saline and Albumin). To evaluate the effect of iNOS inhibition on lung damage, SMT was given immediately after AP (Group Saline+SMT, and Group Albumin+SMT). At 12 h after AP induction, serum amylase activity, lung vascular permeability and myeloperoxidase (MPO) activity were evaluated. Lung and pancreas histological analysis were performed. RESULTS Serum amylase activity, pancreatic edema, lung vascular permeability, MPO activity, and inflammatory infiltration were significantly increased after AP. Albumin administration increased lung vascular permeability, inflammatory infiltration, and pancreatic edema compared to saline administration (p < 0.05). Albumin administration with SMT reduced lung vascular permeability, MPO activity, and inflammatory infiltration compared to albumin administration alone (p < 0.05). CONCLUSION Lung and pancreatic damage induced by albumin administration for restoration of plasma volume in AP are reduced by iNOS inhibition. Awareness of this fact may be useful in high-risk patients who need to receive albumin for volume replacement.
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Affiliation(s)
- Emilio Elias Abdo
- Department of Gastroenterology (LIM/37), Medical School, University of São Paulo, São Paulo, Brazil
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Coelho AMM, Kunitake TA, Machado MCC, Martins JO, Patzina RA, D'Albuquerque LAC, Jukemura J. Is there a therapeutic window for pentoxifylline after the onset of acute pancreatitis? Acta Cir Bras 2013; 27:487-93. [PMID: 22760835 DOI: 10.1590/s0102-86502012000700010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2012] [Accepted: 05/21/2012] [Indexed: 12/24/2022] Open
Abstract
PURPOSE To investigate the effects of pentoxifylline (PTX) in experimental acute pancreatitis (AP) starting drug administration after the induction of the disease. METHODS One hundred male Wistar rats were submitted to taurocholate-induced AP and divided into three groups: Group Sham: sham-operated rats, Group Saline: AP plus saline solution, and Group PTX: AP plus PTX. Saline solution and PTX were administered 1 hour after induction of AP. At 3 hours after AP induction, peritoneal levels of tumor necrosis factor (TNF)-α, and serum levels of interleukin (IL)-6 and IL-10 levels were assayed by Enzyme-Linked Immunosorbent Assay (ELISA). Determinations of lung myeloperoxidase activity (MPO), histological analysis of lung and pancreas, and mortality study were performed. RESULTS PTX administration 1 hour after induction of AP caused a significant decrease in peritoneal levels of TNF-α and in serum levels of IL-6 and IL-10 when compared to the saline group. There were no differences in lung MPO activity between the two groups with AP. A decrease in mortality was observed in the PTX treatment compared to the saline group. CONCLUSIONS Administration of PTX after the onset of AP decreased the systemic levels of proinflammatory cytokines, raising the possibility that there is an early therapeutic window for PTX after the initiation of AP.
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Affiliation(s)
- Ana Maria Mendonça Coelho
- Laboratory of Liver Transplantation and Experimental Surgery, Department of Gastroenterology, Medical School, University of São Paulo, Brazil
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Martino RB, Coelho AMM, Kubrusly MS, Leitão R, Sampietre SN, Machado MCC, Bacchella T, D'Albuquerque LAC. Pentoxifylline improves liver regeneration through down-regulation of TNF-α synthesis and TGF-β1 gene expression. World J Gastrointest Surg 2012; 4:146-51. [PMID: 22816029 PMCID: PMC3400043 DOI: 10.4240/wjgs.v4.i6.146] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Revised: 06/20/2012] [Accepted: 06/23/2012] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the mechanism of pentoxifylline (PTX) improvement in liver regeneration.
RESULTS: Rats were randomized into 4 groups: Control rats; Sham - sham-operation rats; Saline - 70% hepatectomy plus saline solution; PTX - 70% hepatectomy plus PTX. At 2 and 6 h after hepatectomy, aspartate aminotransferase, alanine aminotransferase, tumor necrosis factor (TNF)-α and interleukin-6 (IL-6) serum and hepatic tissue levels were determined. Tumor growth factor (TGF)-β1 gene expression in liver tissue was evaluated 24 h after hepatectomy by quantitative reverse transcriptase polymerase chain reaction analysis. Proliferation was analyzed by mitotic index and proliferating cell nuclear antigen (PCNA) staining 48 h after hepatectomy.
RESULTS: TNF-α and IL-6 serum levels increased at 2 and 6 h after hepatectomy. At 2 h after hepatectomy serum PTX was reduced but not hepatic levels of TNF-α and IL-6. A decrease in liver TGF-β1 gene expression and an increase in mitotic index and PCNA after hepatectomy were observed in the PTX treatment group in comparison to the saline group.
CONCLUSION: PTX improves liver regeneration by a mechanism related to down regulation of TNF-α production and TGF-β1 gene expression.
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Affiliation(s)
- Rodrigo Bronze Martino
- Rodrigo Bronze Martino, Ana Maria Mendonça Coelho, Márcia Saldanha Kubrusly, Regina Leitão, Sandra Nassa Sampietre, Marcel Cerqueira Cesar Machado, Telesforo Bacchella, Luiz Augusto Carneiro D'Albuquerque, Department of Gastroenterology (LIM/37), and Department of Surgery, Medical School, University of Sao Paulo, Sao Paulo 01246903, Brazil
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Figueira ERR, Bacchella T, Coelho AMM, Sampietre SN, Molan NAT, Leitão RMC, Machado MCC. Timing-dependent protection of hypertonic saline solution administration in experimental liver ischemia/reperfusion injury. Surgery 2009; 147:415-23. [PMID: 20004454 DOI: 10.1016/j.surg.2009.10.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2008] [Accepted: 10/05/2009] [Indexed: 01/05/2023]
Abstract
BACKGROUND During liver ischemia, the decrease in mitochondrial energy causes cellular damage that is aggravated after reperfusion. This injury can trigger a systemic inflammatory syndrome, also producing remote organ damage. Several substances have been employed to decrease this inflammatory response during liver transplantation, liver resections, and hypovolemic shock. The aim of this study was to evaluate the effects of hypertonic saline solution and the best timing of administration to prevent organ injury during experimental liver ischemia/reperfusion. METHODS Rats underwent 1 hr of warm liver ischemia followed by reperfusion. Eighty-four rats were allocated into 6 groups: sham group, control of ischemia group (C), pre-ischemia treated NaCl 0.9% (ISS) and NaCl 7.5% (HTS) groups, pre-reperfusion ISS, and HTS groups. Blood and tissue samples were collected 4 hr after reperfusion. RESULTS HTS showed beneficial effects in prevention of liver ischemia/reperfusion injury. HTS groups developed increases in AST and ALT levels that were significantly less than ISS groups; however, the HTS pre-reperfusion group showed levels significantly less than the HTS pre-ischemia group. No differences in IL-6 and IL-10 levels were observed. A significant decrease in mitochondrial dysfunction as well as hepatic edema was observed in the HTS pre-reperfusion group. Pulmonary vascular permeability was significantly less in the pre-reperfusion HTS group compared to the ISS group. No differences in myeloperoxidase activity were observed. The liver histologic score was significantly less in the pre-reperfusion HTS group compared to the pre-ischemia HTS group. CONCLUSION HTS ameliorated local and systemic injuries in experimental liver ischemia/reperfusion. Infusion of HTS in the pre-reperfusion period may be an important adjunct to accomplish the best results.
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Affiliation(s)
- Estela Regina Ramos Figueira
- Liver Transplantation Service, Department of Surgery, University of São Paulo Medical School, São Paulo, Brazil.
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Almeida JL, Sampietre SN, Mendonça Coelho AM, Trindade Molan NA, Machado MCC, Monteiro da Cunha JE, Jukemura J. Statin pretreatment in experimental acute pancreatitis. JOP 2008; 9:431-439. [PMID: 18648134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
CONTEXT Some authors have found beneficial effect of statins in certain inflammatory conditions, but the effect of statins on acute pancreatitis is not yet defined. OBJECTIVE The aim of this study was to evaluate the effect of simvastatin on an experimental model of mild and severe acute pancreatitis. ANIMALS One hundred and one Wistar rats with cerulein or taurocholate-induced acute pancreatitis were used in this study. DESIGN The rats were divided into two groups: Group I (n=51) received two previously i.p. injections (18+/-2 and 3+/-1 hours) of simvastatin (200 microg/kg) and Group II (n=50) received two previously i.p. injections of saline. Both groups were subdivided into two subgroups: mild pancreatitis (cerulein-induced; IA, n=10; IIA, n=10) and severe pancreatitis (taurocholate-induced; IB, n=41; IIB, n=40). MAIN OUTCOME MEASURES The parameters evaluated were: pancreatic vascular permeability, tissue water content, histologic lesion, amylase serum levels in rats with mild pancreatitis (subgroups A); mortality rate, serum levels of IL-6, IL-10, amylase, pulmonary myeloperoxidase activity and ascitic levels of TNF-alpha in rats with severe pancreatitis (subgroups B). RESULTS Serum levels of IL-10 were significantly lower in the simvastatin-treated group as well as the myeloperoxidase activity. There was no significant difference in any of other studied parameters. CONCLUSION Simvastatin appears to reduce inflammatory cytokines and pulmonary neutrophilic activation in the severe acute pancreatitis model, but there is no significant effect on survival curve, in spite of a clear trend towards a better survival in the simvastatin group.
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Affiliation(s)
- José Luiz Almeida
- Department of Gastroenterology, University of São Paulo Medical School, São Paulo, Brazil.
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de Almeida JLJ, Jukemura J, Coelho AMM, Patzina RA, Machado MCC, da Cunha JEM. Inhibition of cyclooxygenase-2 in experimental severe acute pancreatitis. Clinics (Sao Paulo) 2006; 61:301-6. [PMID: 16924320 DOI: 10.1590/s1807-59322006000400005] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2005] [Accepted: 04/12/2006] [Indexed: 11/21/2022] Open
Abstract
BACKGROUND The standard treatment for acute pancreatitis (AP) is still based on supportive care. The search for a new drug that could change the natural history of the disease is a continuing challenge for many researchers. The aim of this study is to evaluate the effect of a cyclooxygenase-2 (COX-2) inhibitor on experimental AP in rats. METHODS The animals were divided into 2 groups: Group 1 (n = 30)-animals with taurocholate-induced AP treated with parecoxib (40 mg/kg). Group 2 (n = 30)-animals with taurocholate-induced AP that received saline. The COX-2 inhibitor (parecoxib) was injected immediately after AP induction, through the penis dorsal vein. The parameters evaluated were histology, serum levels of amylase, IL-6 and IL-10, and mortality rate. RESULTS The serum levels of IL-6 and IL-10 in the parecoxib-treated group were lower than the control group. The amylase serum levels and the mortality rate remained unchanged in the treated animals. Histologic morphology also was unaltered, except for fat necrosis, which was higher in parecoxib-treated rats. CONCLUSION Inhibition of Cox-2 decreases the systemic release of inflammatory cytokines, but has a poor effect on the direct pancreas injury caused by taurocholate.
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Oliveira CPMS, Coelho AMM, Barbeiro HV, Lima VMR, Soriano F, Ribeiro C, Molan NAT, Alves VAF, Souza HP, Machado MCC, Carrilho FJ. Liver mitochondrial dysfunction and oxidative stress in the pathogenesis of experimental nonalcoholic fatty liver disease. Braz J Med Biol Res 2006; 39:189-94. [PMID: 16470305 DOI: 10.1590/s0100-879x2006000200004] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Oxidative stress and hepatic mitochondria play a role in the pathogenesis of nonalcoholic fatty liver disease. The aim of the present study was to evaluate the role of hepatic mitochondrial dysfunction and oxidative stress in the pathogenesis of the disease. Fatty liver was induced in Wistar rats with a choline-deficient diet (CD; N = 7) or a high-fat diet enriched with PUFAs-omega-3 (H; N = 7) for 4 weeks. The control group (N = 7) was fed a standard diet. Liver mitochondrial oxidation and phosphorylation were measured polarographically and oxidative stress was estimated on the basis of malondialdehyde and glutathione concentrations. Moderate macrovacuolar liver steatosis was observed in the CD group and mild liver steatosis was observed in the periportal area in the H group. There was an increase in the oxygen consumption rate by liver mitochondria in respiratory state 4 (S4) and a decrease in respiratory control rate (RCR) in the CD group (S4: 32.70 +/- 3.35; RCR: 2.55 +/- 0.15 ng atoms of O2 min-1 mg protein-1) when compared to the H and control groups (S4: 23.09 +/- 1.53, 17.04 +/- 2.03, RCR: 3.15 +/- 0.15, 3.68 +/- 0.15 ng atoms of O2 min-1 mg protein-1, respectively), P < 0.05. Hepatic lipoperoxide concentrations were significantly increased and the concentration of reduced glutathione was significantly reduced in the CD group. A choline-deficient diet causes moderate steatosis with disruption of liver mitochondrial function and increased oxidative stress. These data suggest that lipid peroxidation products can impair the flow of electrons along the respiratory chain, causing overreduction of respiratory chain components and enhanced mitochondrial reactive oxygen species. These findings are important in the pathogenesis of nonalcoholic fatty liver disease.
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Affiliation(s)
- C P M S Oliveira
- Departamento de Gastroenterologia (LIM 07), Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brazil.
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Abdo EE, Cunha JEM, Deluca P, Coelho AMM, Bacchella T, Machado MCC. Protective effect of N2-mercaptopropionylglycine on rats and dogs liver during ischemia/reperfusion process. Arq Gastroenterol 2004; 40:177-80. [PMID: 15029394 DOI: 10.1590/s0004-28032003000300008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
BACKGROUND N2-mercaptopropionylglycine is a powerful super oxide synthesis inhibitor and has been tested as a preventive agent of metabolic and structural hepatic damage in the ischemia/reperfusion process. AIM To analyze some effects of N2-mercaptopropionylglycine administration to animals of two species submitted to normothermic liver ischemia/reperfusion. MATERIAL AND METHODS Twenty-two rats and 22 dogs were divided into four groups: group I: rats that received intravenous saline 0.9%; group II: rats that received 100 mg/kg of N2-mercaptopropionylglycine; group III: dogs that received saline intravenous 0.9% and group IV: dogs that received 100 mg/kg N2-mercaptopropionylglycine. RESULTS Ten minutes after the saline or drug administration, each group was submitted to left lobe liver ischemia for 25 minutes followed by reperfusion. Biochemical studies 24 hours after reperfusion revealed a significantly lower elevation of transaminases in animals of groups II (AST = 271 +/- 182; ALT = 261 +/- 161 ) and IV (AST = 101 +/- 45; ALT = 123 +/- 89) when compared to the controls group: I (AST = 2144 +/- 966; ALT = 1869 +/- 1040 00) and III (AST = 182 +/- 76.51; ALT = 277 +/- 219), respectively. Histology study demonstrated a significantly minor aggression to animals of groups II and IV when compared to groups I and III, respectively. CONCLUSION These results suggest a significant release of free radicals of oxygen in the process and that N2-mercaptopropionylglycine may have a significant protective effect on liver parenchyma when submitted to ischemia/reperfusion.
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Affiliation(s)
- Emilio Elias Abdo
- Surgical Division, Department of Gastroenterology, University Medical School, São Paulo, SP, Brazil
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