RESUMO
BACKGROUND: The aim of this study was to explore the protective mechanisms of taurine pretreatment against hepatic ischemia/reperfusion injury after liver transplantation. METHODS: A Sprague-Dawley-to-Sprague-Dawley rat liver transplantation model was used in this study. At 0, 60, and 180 minutes after reperfusion, expression of interleukin-1 receptor-associated kinase-4 (IRAK-4) messenger ribonucleic acid and protein in Kupffer cells was determined by real-time polymerase chain reaction and Western blotting. The activity of nuclear factor κB in Kupffer cells was determined by electrophoretic mobility shift assay. The serum tumor necrosis factor-α level was detected by enzyme-linked immunosorbent assay. Serum transaminases, liver histology, and animal survival were also investigated. RESULTS: At 60 and 180 minutes after reperfusion, levels of IRAK-4 messenger ribonucleic acid and protein, activities of nuclear factor κB, and levels of serum transaminases and tumor necrosis factor-α were all obviously elevated. However, changes in these parameters in rats treated with taurine were remarkably attenuated at the indicated time points. CONCLUSIONS: These data suggest that taurine could protect against hepatic ischemia/reperfusion injury after liver transplantation, and the protective effects may be through downregulation of IRAK-4 and downstream nuclear factor κB and tumor necrosis factor-α expression in Kupffer cells.
Assuntos
Quinases Associadas a Receptores de Interleucina-1/metabolismo , Células de Kupffer/enzimologia , Transplante de Fígado , Fígado/enzimologia , NF-kappa B/metabolismo , Disfunção Primária do Enxerto/metabolismo , Disfunção Primária do Enxerto/prevenção & controle , Substâncias Protetoras/farmacologia , Taurina/farmacologia , Fator de Necrose Tumoral alfa/metabolismo , Alanina Transaminase/metabolismo , Animais , Aspartato Aminotransferases/metabolismo , Western Blotting , Ensaio de Desvio de Mobilidade Eletroforética , Ensaio de Imunoadsorção Enzimática , Regulação Enzimológica da Expressão Gênica , Células de Kupffer/efeitos dos fármacos , Células de Kupffer/metabolismo , Fígado/metabolismo , Fígado/patologia , Testes de Função Hepática , Transplante de Fígado/efeitos adversos , Masculino , Disfunção Primária do Enxerto/etiologia , Disfunção Primária do Enxerto/patologia , Substâncias Protetoras/administração & dosagem , Distribuição Aleatória , Ratos , Ratos Sprague-Dawley , Reação em Cadeia da Polimerase em Tempo Real , Taurina/administração & dosagem , Fatores de TempoRESUMO
BACKGROUND: The effect of glutamine-enriched early enteral nutrition (Gln-EEN) on intestinal mucosal barrier injury after liver transplantation (LT) remains uncertain. METHODS: The Wistar-to-Wistar rat LT model was used to explore the protective effect of Gln-EEN. Morphologic changes of intestinal mucosa, levels of intestinal malondialdehyde and secretory immunoglobulin (sIgA), plasma endotoxin, D-lactic acid, serum tumor necrosis factor-alpha (TNF-alpha), rates of bacterial translocation, and expression of intestinal nuclear factor-kappaB, TNF-alpha, and intercellular adhesion molecule-1 were determined. RESULTS: After LT, intestinal mucosa was damaged seriously. At 12, 24, and 48 hours posttransplantation, levels of intestinal sIgA were decreased; levels of malondialdehyde, endotoxin, D-lactic acid, and TNF-alpha, the ratio of bacterial translocation, and the expression of intestinal nuclear factor-kappaB, TNF-alpha, and intercellular adhesion molecule-1 all were increased. However, changes in earlier-mentioned parameters in recipients treated with Gln-EEN were attenuated remarkably at 24 to 48 hours. CONCLUSIONS: Our data show that Gln-EEN is a potent protectant against intestinal mucosal barrier injury after LT.