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氯氨酮对大鼠缺血再灌注心肌细胞凋亡和Fas/FasL蛋白表达的影响 总被引：1，自引：0，他引：1
目的:探讨氯胺酮对大鼠实验性心肌缺血再灌注时心肌细胞凋亡与Fas及Fas蛋白配体(FasLi-gand,FasL)表达的影响,并分析心肌组织病理学损伤程度。方法:以穿线结扎或松扎左冠状动脉制备大鼠心肌缺血再灌注模型。32只大鼠随机平均分成假手术组(假手术4.5 h)、缺血再灌注组(缺血30min、再灌注4 h)、低剂量氯胺酮再灌注组(缺血30 min、再灌注4 h)及高剂量氯胺酮再灌注组(缺血30 min、再灌注4 h)。以缺口末端标记法检测心肌细胞凋亡的变化,S-P免疫组化法分别检测Fas与FasL蛋白水平变化,做病理组织切片检查心肌损伤情况。结果:心肌缺血再灌注前心肌细胞凋亡指数、Fas蛋白阳性染色指数与炎性细胞FasL蛋白阳性染色指数分别为4.25±2.04、1.06±0.25和0,心肌缺血再灌注后心肌细胞凋亡指数、Fas蛋白阳性染色指数和炎性细胞FasL蛋白阳性染色指数分别为12.58±1.35,11.05±3.02和8.12±3.54,低剂量氯氨酮作用组心肌细胞凋亡指数及Fas蛋白阳性染色指数与炎性细胞FasL蛋白阳性染色指数分别为7.36±1.30,7.61±3.41和3.69±3.13;心肌缺血再灌注后心肌组织呈大小不一的灶性坏死,坏死周围有炎性细胞浸润,氯胺酮作用后坏死减轻,低剂量氯胺酮作用更明显。结论:心肌缺血再灌注时心肌细胞凋亡、Fas基因的蛋白与炎性细胞的FasL蛋白表达量均增加,氯氨酮可减少心肌凋亡,减少细胞Fas和FasL蛋白阳性表达,从而减轻心肌损伤,且低剂量氯氨酮作用更明显。 相似文献
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旨在研究Fas/FasL通路对镉激活PC12细胞MAPK通路的影响,用10 μmol L-1醋酸镉（CdAc2）分别处理插入非特异性序列PC12细胞与Fas基因沉默PC12细胞12 h;用10 μmol·L-1CdAc2与40 μmol·L-1 Z-IETD-FMK （caspase-8特异性抑制剂）单独或联合处理PC12细胞12 h。通过Western blot检测Fas/FasL通路相关蛋白Fas、FasL、Fas相关死亡域蛋白（FADD）、Cleaved caspase-8、死亡结构域相关蛋白（Daxx）、凋亡信号调节激酶1（ASK1）的表达与MAPK通路相关蛋白ERK1/2、JNK1/2、p-ERK1/2、p-JNK1/2的表达;Hoechst33258荧光染色检测细胞凋亡形态学变化,流式细胞术检测细胞凋亡率。结果显示,Fas shRNA慢病毒极显著抑制镉引起的PC12细胞Fas/FasL通路相关蛋白表达量和凋亡率的升高（P<0.01）,缓解镉引起的PC12细胞凋亡形态学变化;Fas shRNA与Z-IETD-FMK均能够极显著抑制镉引起的PC12细胞MAPK通路相关蛋白ERK1/2与JNK1/2磷酸化水平升高（P<0.01）。综上表明,Fas/FasL通路调控MAPK通路参与镉致PC12细胞凋亡。 相似文献
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The effects of neriifolin, a cardiac glycoside from Cerbera manghas L. on various end-points of oncologic relevance (cell growth, cell cycle regulation, and apoptosis in HepG2 cells) were investigated. Neriifolin reduced viability of HepG2 cells, induced S and G2/M phase arrests of the cell cycle, and stimulated apoptosis of HepG2 cells. Stimulation of HepG2 cells with neriifolin induced activation of caspase-3, -8, and -9, and up-regulated expression of Fas and FasL proteins. Based on these results, neriifolin could be considered a candidate for the treatment of hepatocellular carcinoma. 相似文献
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AIM: To discuss the effect of Fas/FasL on the late reperfusion of acute myocardial infarction (AMI) and the potential oxidative stress mechanism. METHODS:Eighteen anesthetized dogs were randomly divided into three groups: late reperfusion group (n=6): ligated the coronary for 6 h, followed by reperfusion for 6 h; permanent ischemia group (n=6): after pericardium were opened for 6 h, ligated the coronary for 6 h, and did not reperfuse; control group (n=6): did not ligate the coronary but operation last for 12 h. Infarction brim myocardial Fas/FasL was detected by immunohistochemistry. Apoptosis index (AI) was detected by TUNEL. SOD and GR activity and MDA content were detected by colorimetry. RESULTS:The expression of Fas/FasL and apoptosis index were significantly higher in permanent ischemia group and late reperfusion group than those in control group (P<0.05, P<0.01), and the difference between them was also significant (P<0.05). SOD and GR activities were lower in permanent ischemia group and late reperfusion group than those in control group (P<0.05, P<0.01). The MDA contents in permanent ischemia group and late reperfusion group were higher than that in control group (P<0.05). CONCLUSION:The late reperfusion of AMI promotes the expression of Fas/FasL and myocardial apoptosis, and it may be due to oxidative stress mechanism. 相似文献
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