基础医学与临床 ›› 2018, Vol. 38 ›› Issue (4): 458-463.

• 研究论文 • 上一篇    下一篇

激活M3受体减轻CoCl2诱导的大鼠心肌细胞系H9c2低氧损伤

彭源1,赵延礼2,苏晓灵3,沈国平2,龙启福4,秦海兰2,王嵘2   

  1. 1. 青海大学
    2. 青海大学医学院
    3. 青海省人民医院
    4. 青海大学医学院生化教研室
  • 收稿日期:2017-11-10 修回日期:2018-01-16 出版日期:2018-04-05 发布日期:2018-03-27
  • 通讯作者: 彭源 E-mail:153910539@qq.com
  • 基金资助:
    青海省自然科学基金

Activation of M3-mAChR attenuates hypoxia injury induced by CoCl2 in rat myocardial cell line H9c2

  • Received:2017-11-10 Revised:2018-01-16 Online:2018-04-05 Published:2018-03-27

摘要: 目的 探讨卡巴胆碱(CCH, 毒蕈碱受体亚型3特异性激动剂)激活毒蕈碱受体亚型3 (M3-mAChR)在氯化钴(CoCl2)诱导的大鼠心肌细胞系H9c2低氧损伤中的作用及机制。方法 正常大鼠心肌细胞系H9c2作对照组,利用CoCl2建立低氧损伤模型,选用M3受体特异性激动剂CCH及其特异性阻断剂4-二苯乙酰氧基-N-甲基-哌啶甲碘化物(4-DAMP)对低氧损伤组进行干预。噻唑蓝比色法(MTT)检验细胞增殖活力;流式细胞计量术检测细胞凋亡;Western blot检测M3受体、HIF-1α、HO-1和caspase-3蛋白表达水平。结果 低氧模型组细胞凋亡率显著增高(P<0.01),细胞增殖显著降低(P<0.01);HIF-1α、caspase-3和HO-1蛋白表达水平显著上调(P<0.01)。用CCH干预后细胞凋亡率明显下降(P<0.01),细胞增殖活力明显增加(P<0.01);M3受体、HIF-1α和HO-1蛋白表达水平显著上升(P<0.01);caspase-3蛋白表达水平明显降低(P<0.01)。应用4-DAMP干预后,由CCH介导的上述相关作用被抑制。结论 CCH激活M3受体抑制CoCl2诱导的大鼠心肌细胞系H9c2的低氧损伤,机制可能与HIF-1α和HO-1的蛋白表达水平上调有关。

关键词: 毒蕈碱受体亚型3, 低氧损伤, 低氧诱导因子-1α, 血红素加氧酶-1

Abstract: Objective To investigate the cytoprotection and mechanism of carbachol(CCH) stimulate M3 muscarinic acetylcholine receptor(M3-mAChR) against on hypoxia injury induced by Cobaltous chloride hexahydrate(CoCl2) in rat cardiomyocyte strain H9c2. Methods Select the normal rat cardiomyocyte strain H9c2 as the control group, rat cardiomyocyte strain H9c2 were managed with CoCl2 to establish hypoxia injury model, M3-mAChR specific agonist CCH and antagonist 4-diphenyl-acetoxy-N-methyl-piperidine methiodide(4-DAMP) were used for intervention. The cell viability was tested by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide(MTT); The apoptosis in cardiomyocyte was detected by flow cytomery(FCM); The expression levels of M3-mAChR, caspase-3, HIF-1α and HO-1 proteins were measured by Western blot assay. Results In hypoxia group, the apoptosis rate was significantly increased, cell proliferation was distinctly decreased, and the expression of HIF-1α, caspase-3 and HO-1 proteins were up-regulated obviously; After treated with CCH, the apoptosis rate of cardiomyocytes was significantly decreased, while the proliferation of cells was significantly increased, and the expression of M3-mAChR, HIF-1α and HO-1 proteins were increased, and the expression of caspase-3 protein was significantly decreased. Moreover, when applying 4-DAMP for intervention, these effects that mediated by CCH was abolished. Conclusions CCH stimulate M3-mAChR against on hypoxia injury induced by CoCl2 in rat cardiomyocyte strain H9c2, and the mechanism may be related to down-regulation of caspase-3 expression and up-regulation of HIF-1α and HO-1 protein expression.

Key words: M3-mAChR, hypoxia injury, HIF-1α, HO-1