Effect of hepatic ischemia-reperfusion on bile canalicular F-actin microfilaments in rats

• 来源期刊: 南京医科大学学报(英文版)
• 年，卷（期）: 2009,（2）
• 页码范围: 137-142
• 页数: 6页
• 语种: 英文

摘要

Objective:To investigate the effect of hepatic isehemia-reperfusion(I/R) on bile canalicular F-actin microfilaments in rats. Methods: A rat model of hepatic ischemia-reperfusion was employed and the ischemia time was 35 rain. The activity of serum alanine aminotransferase (ALT), aspartate aminotransferase(AST), γ-glutamyl transferase(GGT) and the level of total bilirubin(TBIL) were measured. Changes in the bile canaliculi were observed by transmission electron microscope. The modification of F-actin microfilaments was quantified by using FITC-PhaUoidin and analyzed by confocal laser scanning microscopy imaging. Results:Modifications of F-actin staining were consistent with the observations made by transmission electron microscopy. The staining of F-actin was normal in hepatocytes before reperfusion but decreased significantly after reperfusion, and there was a marked loss of canalicular microvilli after reperfusion, which coincided with abnormal serum GGT and TBIL levels. Conclusion:Reperfusion, not short-term ischemia, induced a disruption of F-actin microfilaments and a loss of microvilli. These modifications could lead to the impaired bile secretion by damaging canaUcular contraction, and could be the main mechanisms of cholestasis after hepatic ischemia-reperfusion in rats.