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Effect of low flow ischemia-reperfusion injury on liver function.

Abstract：

:The release of liver enzymes is typically used to assess tissue damage following ischemia-reperfusion. The present study was designed to determine the impact of ischemia-reperfusion on liver function and compare these findings with enzyme release. Isolated, perfused rat livers were subjected to low flow ischemia followed by reperfusion. Alterations in liver function were determined by comparing rates of oxygen consumption, gluconeogenesis, ureagenesis, and ketogenesis before and after ischemia. Lactate dehydrogenase (LDH) and purine nucleoside phosphorylase (PNP) activities in effluent perfusate were used as markers of parenchymal and endothelial cell injury, respectively. Trypan blue staining was used to localize necrosis. Total glutathione (GSH + GSSG) and oxidized glutathione (GSSG) were measured in the perfusate as indicators of intracellular oxidative stress. LDH activity was increased 2-fold during reperfusion compared to livers kept normoxic for the same time period whereas PNP activity was elevated 5-fold under comparable conditions. Rates of oxygen consumption, gluconeogenesis, and ureagenesis were unchanged after ischemia, but ketogenesis was decreased 40% following 90 min ischemia. During reperfusion, the efflux rates of total glutathione and GSSG were unchanged from pre-ischemic values. Significant midzonal staining of hepatocyte nuclei was observed following ischemia-reperfusion, whereas normoxic livers had only scattered staining of individual cells. Reperfusion of ischemic liver caused release of hepatic enzymes and midzonal cell death, however, several major liver functions were unaffected under these experimental conditions. These data indicate that there were negligible changes in liver function in this model of ischemia and reperfusion despite substantial enzyme release from the liver and midzonal cell death.

journal_name

Life Sci

journal_title

Life sciences

authors

Bailey SM,Reinke LA

doi

10.1016/s0024-3205(99)00668-2

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

1033-44

issue

11

eissn

0024-3205

issn

1879-0631

pii

S0024320599006682

journal_volume

66

pub_type

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