- 作者：Yiming Li ; Hua Li ; Jidong Liu ; Hong Ji
- 关键词：ischemia-reperfusion ; cholestasis ; F-actin
- 刊名：Journal of Nanjing Medical University
- 出版年：2009
- 出版时间：March 2009
- 年：2009
- 卷：23
- 期：2
- 页码：137-142
- 全文大小：441 K
ObjectiveTo investigate the effect of hepatic ischemia-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 min. 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-Phalloidin 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 canalicular contraction, and could be the main mechanisms of cholestasis after hepatic ischemia-reperfusion in rats.