心脏纤维细胞增强MMP2活动,以抑制心肌细胞中缺口结合功能
Xue Bai1, Xiang Huang1, Jing Yi1
1School of Anesthesiology, Guizhou Medical University, Guiyang, 550004, Guizhou, China.
Applied biochemistry and biotechnology
|June 15, 2024
概括
重灌损伤可以导致心律失常. 低氧/低氧化治疗的心脏纤维细胞介质通过MMP2激活损害了间隙结,这表明MMP2抑制是反律乱的治疗点.
科学领域:
- 心血管生理学心血管生理学
- 分子心脏病学分子心脏病学
- 心脏电生理学 心脏电生理学
背景情况:
- 在心肌缺血后的再输血可以矛盾地诱导心律失常.
- 心脏纤维细胞通过各种机制影响心肌细胞电生理学.
- 以前的研究表明,低氧/低氧化处理的纤维细胞受条件介质 (H/R-FCM) 影响心肌细胞跳动频率和间隙结蛋白.
研究的目的:
- 调查H/R-FCM影响心脏间隙连接的特定机制.
- 探索矩阵金属蛋白酶2 (MMP2) 在H/R-FCM诱导的电生理学变化中的作用.
- 评估MMP2抑制在缓解反注射引起的心律失常的治疗潜力.
主要方法:
- 在低氧条件下培养了老鼠心脏纤维细胞,以获得H/R-FCM.
- 在用H/R-FCM治疗的H9c2心肌细胞中评估了间隙结功能,半通道活性和连xin 43 (Cx43) 表达.
- 凝组图用于检测矩阵金属蛋白酶 (MMP) 活性.
- 一个孤立的老鼠缺血/反 (I/R) 模型被用来研究H/R-FCM和MMP2抑制剂对心脏电生理学和心律失常的影响.
主要成果:
- 在心肌细胞中,H/R-FCM治疗损害了间隙结功能,降低了Cx43表达的调节.
- 在大鼠心肌细胞中,H/R-FCM增加了半通道活性.
- H/R-FCM对差距连接的不良影响与MMP2激活有关.
- 抑制MMP2部分减轻了I / R对肌肉心电生理指数和心律失常易感性的有害影响.
结论:
- 由MMP2介导的心脏纤维细胞的低氧/低氧化诱导的变化对心肌细胞间隙结产生不利影响.
- MMP2激活在再注血诱导的心律失常的发展中起着重要作用.
- 抑制MMP2代表了治疗再输血失常症的潜在治疗策略.
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