外周苯二氮卓受体对缺氧复氧损伤心肌细胞中钙离子浓度和蛋白激酶C含量的作用  

Effect of peripheral benzodiazepine receptor on protein kinase C and intracellular calcium of myocardial cells after hypoxia-reoxygenation injury in rats

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作  者:刁玉刚[1] 祖剑宇[2] 刘洁[3] 刘海梅[1] 马虹[1] 王俊科[1] 

机构地区:[1]中国医科大学附属第一医院麻醉科 [2]中国医科大学附属盛京医院麻醉科 [3]中国医科大学实验技术中心

出  处:《中国临床药理学与治疗学》2007年第5期558-561,共4页Chinese Journal of Clinical Pharmacology and Therapeutics

基  金:辽宁省教育厅高等学校科学技术研究基金项目(2004D181)

摘  要:目的:研究线粒体外周型苯二氮卓受体(PBR)对缺氧复氧损伤所致大鼠心肌细胞凋亡、细胞内钙离子浓度和蛋白激酶C含量的影响。方法:采用改良的Simpson法分离培养心肌细胞,建立大鼠心肌细胞缺氧复氧损伤模型,培养融合的细胞随机分为5组:对照组(C组)、缺氧复氧组(HR组)、PBR拮抗剂PK11195组(P组)、PBR激动剂Ro5-4864组(R组)、PK11195 +Ro5-4864组(PR组)。P、R组在缺氧前30 min于培养液中分别加入终浓度10-4mol/L PK11195和Ro5-4864 ,PR组在缺氧前30 min加入以上浓度的两种药物共同孵育,然后再进行缺氧复氧。结果:R组细胞凋亡率(9 .4±0 .6) %与HR组(26 .6±2 .7) %比较有统计学意义(P<0 .05) ,PR组细胞凋亡(27 .4±3 .1) %与R组比较有统计学意义(P<0 .01) ;R组细胞内钙离子荧光强度(172±29)与HR组(207±22)比较差异有统计学意义(P<0 .01) ,PR组(222±26)与R组比较差异有统计学意义(P<0 .01) ;R组细胞蛋白激酶C表达(21±4) %与HR组(12±4) %比较有统计学意义(P<0 .01) ,PR组(11±4) %与R组比较有统计学意义(P<0 .01)。结论:PBR激活明显抑制缺氧复氧所致的心肌细胞凋亡,该作用是通过抑制细胞内钙离子浓度增加和激活蛋白激酶C信号转导通路实现的。AIM: To investigate the effect and the mechanism of mitochondria peripheral benzodiazepine receptor (PBR) on myocardial apoptosis induced by hypoxia-reoxygenation injury. METHODS: The myocardial cells of neonatal rats were separated and cultured by the improved Simpson method to set up hypoxia-reoxygenation model. Cells were divided into five groups: control (C) group, hypoxia-reoxygenation (HR) group, PK11195 (P) group, Ro5-4864 (R) group, PK11195 and Ro5- 4864 (PR) group. RESULTS: The percentage of apoptotic cells in the R group (9.4%±0.6% ) was decreased significantly compared with the FIR group (26.6%±2.7%) (P 〈0.05), and the PR group (27.44%±3.08%) showed a statistic difference compared with the R group (P 〈 0.01). The intracellular calcium in the R group ( 172± 29) was decreased significantly compared with the HR group (207±22) (P 〈 0.01), and the PR group (222±26) showed significant difference compared with the R group ( P 〈 0.01 ). The expression of PKC in the R group (21%±3%) was enhanced significantly compared with the R group (12%±4%) (P 〈0.01), and the PR group ( 11%±4% ) showed significant difference compared with the R group (P 〈 0.01 ). CONCLUSION: The anti-apoptotic character of PBR may be related to the mechanism of activating PKC and inhibiting the intracellular calcium overload to maintain homeostasis.

关 键 词:外周型苯二氮卓受体 缺氧复氧损伤 细胞凋亡 心肌细胞 

分 类 号:R614[医药卫生—麻醉学]

 

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