氯离子对心肌细胞缺氧/复氧损伤的影响

目的　研究氯离子对心肌细胞缺氧/复氧损伤的影响。方法　利用原代培养的心肌细胞缺氧/复氧损伤模型,去除细胞外的氯离子或采用氯通道阻断剂DIDS、SITS进行干预,检测细胞存活率及LDH、MDA、SOD、GXH Px活性变化。结果　缺氧/复氧损伤组与对照组比,LDH、MDA活性升高,细胞存活率、SOD、GXH Px降低; Cl- free+A R组、SITS+A R组处理后较缺氧/复氧组LDH、MDA活性低,细胞存活率、SOD、GXH Px升高;DIDS+A R组的上述指标与缺氧/复氧组比无差异。结论　①氯离子在心肌细胞缺氧/复氧损伤中起了重要作用。②氯通道阻断剂SITS对抗心肌细胞缺氧/复氧损伤有明显的保护作用,而DIDS无保护作用。

The effect of chloride on cultured rat ventricular myocytes during anoxia reoxygenation injury

Aim To investigate the effects of chloride on the injury of the ventricular myocytes from anoxia-reoxygenation. Methods Under the conditions of anoxia-reoxygenation injury, primary cultured rat ventricular myocytes were treated with 4-acetanide- 4′-isothiocya- natostilbene -2,2′-disulfonic acid (SITS),4,4′,-dii sothiocya-nostilbene-2,2′-disulfonicacid (DIDS) or replaced Cl~- with equimolar gluconate, respectively. Then the cell viability and the contents of Lactate dehydrogenase (LDH), malondialdehyde (MDA), superoxide dismutase (SOD)and glutathione peroxidase (GSH-Px) in the media were measured. Results The release of LDH and MDA was significantly increased in the anoxia-reoxygenation group, while the cell viability and the activity of SOD, GSH-Px decreased significantly compared with those in the control group. In both Cl~--free+ A-R group and SITS+A-R group, LDH and MDA release was noticeably lower than those of the A-R group, while the cell viability and the activity of SOD, GSH-Px significantly increased compared with those in the anoxia-reoxygenation group. But the cell viability and the contents of LDH, MDA, SOD and GSH-Px in the DIDS+A-R group had no significant change compared with those in the anoxia-reoxygenation group.Conclusion Cl~- plays an important role in anoxia reoxygenation injury. SITS provides effective protection to the cardiac myocyte subjected to anoxia reoxygenation injury, while DIDS cannot provide such protection.