The role of potassium channel in cardiomyocytes apoptosis induced by ischemia/reperfusion and its mechanism
- VernacularTitle:钾离子通道在心肌细胞缺血再灌注诱导凋亡过程中的作用机制
- Author:
Xiaoming WANG
;
Yanan CAO
;
Weiqin GONG
;
Anheng LIU
;
Weiwei ZHANG
;
Tangwang SHI
;
Yan LIU
- Publication Type:Journal Article
- Keywords:
Potassium channel;
Apoptosis;
Myocardial reperfusion injury
- From:
Chinese Journal of Geriatrics
2008;27(5):372-375
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the role of potassium channel in cardiomyocyte apoptosis induced by ischemia/reperfusion process. Methods Cell viability,caspase-3 activity,intracellular reactive oxygen species(ROS)levels and cell membrane integrity were observed in apoptotic model of mouse cardiomyocytes induced by ischemia/reperfusion(I/R).Experiment groups included negative control,positive control(I/R)and drug treatment group(I/R + potassium channel blocker).Results (1)Potassium channel blockers potently inhibited cardiomyocyte apoptosis induced by I/R.Cell viability in Quinine(81.1%)and BaCl2(82.3%)groups were higher than in positive group (52.1%)(all P＜0.01).(2)Compared with positive control group(482.3%),potassium channel blockers(188.3% in Quinine group and 191.4% in BaCl2 group)inhibited caspase-3 activity significantly 24 hours after reperfusion(P＜0.01).(3)In both positive control and drug groups,the cell lactate dehydrogenase(LDH)leakage was less than 10% at 96 hours after reperfusion.Conclusions Potassium channel blockers can protect injured cardiomyocyte by inhibiting caspase-3 activity and ROS production in I/R process.
