网络首发:2016-10-14,
纸质出版:2016
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ACh对CoCl2化学缺氧诱导H9C2心肌细胞损伤的保护作用及其分子机制[J]. 中山大学学报(医学科学版), 2016,37(5).
Acetylcholine Protect H9C2 Cardiac Cells from CoCl2 -induced Hypoxic Injury and Its Molecular Mechanism[J]. Journal of Sun Yat-sen University (Medical Sciences), 2016, 37(5).
【目的】 探讨乙酰胆碱(Ach)对抗氯化钴(CoCl2)诱导H9C2心肌细胞缺氧损伤的作用及其分子机制。【方法】 应用600 ?滋mol/L CoCl2处理H9C2心肌细胞12 h以建立缺氧损伤细胞模型,应用ACh 10-3 mol/L预处理8 h建立心肌细胞保护模型,实验分为①空白对照组(control);②损伤模型组(CoCl2 600 μmol/L);③ACh预处理组(ACh 10-3 mol/L+ CoCl2 600 μmol/L);④ɑ7胆碱能受体(ɑ7nAChR)拮抗剂组:ACh+甲基牛扁碱柠檬酸盐(MLA)+ CoCl2组(ACh 10-3 mol/L+ CoCl2 600 μmol/L+MLA 10-6 mol/L)。应用CCK-8试剂盒检测细胞存活率。双氯荧光素(DCFH-DA)染色荧光显微镜照相法检测胞内活性氧(ROS)水平。JC-1荧光显微镜照相法检测细胞线粒体膜电位水平改变。Hoechst33258核染色荧光显微镜照相法测定凋亡细胞的形态及数量的变化。Fluo4-AM荧光显微镜照相法测定细胞胞质内钙离子水平的改变。Western Blot检测Drp1、caspase-3蛋白水平。【结果】 600 μmol/L CoCl2处理显著损伤H9C2心肌细胞,线粒体膜电位丢失,ROS生成、细胞凋亡率、胞内钙离子显著增加(P < 0.001),明显上调Drp1、caspase-3表达水平(P<0.001);应用ACh预处理可明显提高H9C2心肌细胞存活率(P < 0.001),ROS水平下降,线粒体膜电位丢失减少(P < 0.001),细胞凋亡率、胞内钙离子明显下降(P < 0.001),显著抑制CoCl2对Drp1、caspase-3表达的上调作用(P < 0.01);ACh+MLA预处理可对抗ACh上述作用过程。【结论】ACh具有保护缺氧H9C2心肌细胞的作用,其机制可能与通过激动ɑ7nAChR抑制钙离子-Drp1通路有关。
【Objective】 To investigate the cytoprotection of acetylcholine(ACh) against cobalt chloride(CoCl2) -induced hypoxic injury in H9C2 cells and its molecular mechanism. 【Methods】 H9C2 cardiac cells were treated with 600 μmol/L CoCl2 for 12 h to establish H9C2 cell injury model; H9C2 cardiac cells were pretreated with 10-3 mol/L Ach for 8 h to establish H9C2 cytoprotection model. The cells were divided into the following four groups: ①control group; ②cell injury model group (CoCl2 600 ?滋mol/L ); ③ACh preconditioning group: ACh+CoCl2 group(ACh 10-3 mol/L+ CoCl2 600 ?滋mol/L); ④ɑ7 nicotinic acetylcholine receptor (ɑ7nAChR) antagonist group: ACh+Methyllycaconitine citrate (MLA)+CoCl2 group(ACh 10-3 mol/L+CoCl2 600 ?滋mol/L+MLA 10-6 mol/L). The cell viability was tested by cell counter kit 8(CCK -8). The intracellular levels of Calcium and reactive oxygen species(ROS) were measured by Fluo4 -AM stainning and DCFH -DA staining respectively. Mitochondrial membrane potential (MMP) was detected by JC -1 staining and photofluorography. The changes of the morphology and the number of apoptotic cells were tested by Hoechst 33258 nuclear staining. The expression levels of Drp1 and caspase-3 proteins were measured by Western blot assay. 【Results】 Exposure of H9C2 cardiac cells to 600 μmol/L CoCl2 markedly induced cell injury and dramatically upregulated the expression level of Drp1 and caspase-3 (P < 0.001),while the accumulation of intracellular calcium and ROS, loss of MMP and the apoptosis rate were increased significantly(P < 0.001). Pretreated cells with ACh before exposuring to CoCl2 significantly increased cell viability(P < 0.001), markedly inhibited upregulating the levels of Drp1 and caspase-3 induced by CoCl2(P<0.01), sigificantly attennuated the accumulation of intracellular calcium and ROS(P < 0.001), while the dissipation of MMP and the apoptosis rate were decreased(P < 0.001). Methyllycaconitine citrate(MLA) can reversed the above effects of ACh. 【Conclusion】 ACh has cardioprotective effect,its mechanism may be associated with the inhibition of calcium-Drp1 pathway by activating the ?琢7 cholinergic receptor.
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