基于DRP1/NLRP3通路探究络风宁2号方治疗心力衰竭机制
Mechanism study of Luofengning Formula 2 on heart failure based on DRP1/NLRP3-mediated pyroptosis
目的 探究络风宁2号方(LFN2)对阿霉素(DOX)诱导的H9C2细胞线粒体动力学紊乱与细胞焦亡的干预作用,并基于DRP1/NLRP3信号通路阐明其作用机制。 方法 将对数生长期H9C2细胞随机分为对照组、模型组、LFN2组、MDIVI-1组及LFN2+MDIVI-1组,通过RT-qPCR、免疫荧光、化学发光、JC-1染色、Western blot等技术,检测细胞损伤、线粒体功能、线粒体动力学及细胞焦亡相关蛋白指标。 结果 与对照组比较,模型组ANP、BNP显著升高,DRP1、NLRP3 mRNA及蛋白表达显著上调,ROS水平升高,ATP含量与线粒体膜电位显著下降;线粒体分裂蛋白DRP1、DRP1-S616、FIS1及细胞焦亡相关蛋白NLRP3、Caspase-1、IL-1β表达升高,线粒体融合蛋白OPA1、MFN2表达降低。与模型组比较,LFN2组与MDIVI-1组均可有效逆转上述异常指标,改善线粒体动力学失衡、抑制细胞焦亡,二者差异无统计学意义。LFN2与MDIVI-1联用可产生协同效果,可进一步下调DRP1-S616及NLRP3表达。 结论 LFN2可通过抑制DRP1磷酸化,抑制线粒体过度分裂,阻断NLRP3介导的细胞焦亡通路,减轻心肌细胞损伤,发挥治疗心力衰竭作用。
Objective To investigate the intervention effect of Luofengning Formula 2 (LFN2) on doxorubicin (DOX)-induced mitochondrial dynamics disorder and pyroptosis in H9C2 cardiomyocytes, and to clarify its mechanism based on the DRP1/NLRP3 signaling pathway. Methods H9C2 cells in the logarithmic growth phase were randomly divided into a control group, a model group, a LFN2 group, a MDIVI-1 group and a LFN2 + MDIVI-1 group. Multiple techniques including RT-qPCR, immunofluorescence, chemiluminescence, JC-1 staining and Western blot were adopted to detect cell injury, mitochondrial function, mitochondrial dynamics and pyroptosis-related protein indicators. Results Compared with the control group, the levels of ANP and BNP were markedly increased in the model group, and the mRNA and protein expressions of DRP1 and NLRP3 were significantly upregulated, accompanied by the elevated ROS level, decreased ATP content and mitochondrial membrane potential. Additionally, the expression of mitochondrial fission proteins DRP1, DRP1-S616 and FIS1 as well as pyroptosis-related proteins NLRP3, Caspase-1 and IL-1β was increased, while the expression of mitochondrial fusion proteins OPA1 and MFN2 was decreased. Compared with the model group, both LFN2 and MDIVI-1 groups effectively reversed the above abnormal indicators, ameliorated mitochondrial dynamics imbalance and inhibited cell pyroptosis, with no statistically significant difference between the two groups. Moreover, a combined administration of LFN2 and MDIVI-1 exerted a synergistic effect, further downregulating the expression of DRP1, DRP1-S616 and NLRP3. Conclusion LFN2 can inhibit excessive mitochondrial fission by suppressing DRP1 phosphorylation, block the NLRP3-mediated pyroptosis pathway and alleviate cardiomyocyte injury, thereby exerting a therapeutic effect on heart failure.
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省部级科研基地建设项目(2025-JYB-KYPT-05)
国家自然科学基金项目(82074263)
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