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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.
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