冠心宁片抑制NLRP3/ASC/Caspase-1通路改善阿霉素诱导的扩张型心肌病大鼠心肌细胞焦亡

Guanxinning tablet ameliorates cardiomyocyte pyroptosis in ratswith dilated cardiomyopathy by inhibiting the NLRP3/ASC/Caspase-1 pathway

目的 研究冠心宁片(Guanxinning, GXN)对扩张型心肌病(dilated cardiomyopathy, DCM)的保护作用,并从NLRP3/ASC/Caspase-1通路深入探讨其对心肌细胞焦亡的作用机制。方法 随机将大鼠分为GXN低剂量组、GXN高剂量组、地高辛组、模型对照组和正常对照组,通过阿霉素(doxorubicin, DOX)累积注射17.5 mg/kg诱导大鼠DCM模型,同时连续给药10周。超声心动图检测心功能指标,ELISA检测血清IL-1β和IL-18水平,RT-PCR法检测心肌组织NLRP3、ASC、Caspase-1、NF-κB、TXNIP、IL-1β和IL-18的mRNA表达,免疫组化、免疫荧光染色和Western Blot检测NLRP3、ASC、Caspase-1、IL-1β、IL-18、GSDMD、GSDMD-NT的蛋白表达及TUNEL染色结果,透射电镜观察心肌细胞显微结构的变化。结果 与正常对照组比,模型对照组的IVSs、IVSd、LVPWs、FS、SV、EF和HR显著降低,LVIDs、ESV及血清IL-1β、IL-18显著增加,NLRP3、ASC、Caspase-1、NF-κB、TXNIP、IL-1β和IL-18的mRNA表达均显著增加,NLRP3、ASC、Caspase-1、IL-1β、IL-18、GSDMD-NT的蛋白表达及TUNEL染色面积明显增加,显微结构明显改变。与模型对照组相比,冠心宁片可显著增加IVSs、SV、FS、EF和HR,显著降低LVIDs、ESV和血清IL-1β、IL-18水平,降低心衰大鼠的NLRP3、ASC、Caspase-1、NF-κB、TXNIP、IL-1β、IL-18的mRNA和NLRP3、ASC、Caspase-1、IL-1β、IL-18、GSDMD-NT的蛋白水平及TUNEL染色面积,显微结构明显改善。结论 冠心宁片可以有效改善阿霉素诱导的扩张型心肌病,可能是通过抑制NLRP3/ASC/Caspase-1通路改善扩张型心肌病大鼠的心肌细胞焦亡实现的。

Objective To investigate the protective effect of Guanxinning(GXN)tablet on dilated cardiomyopathy(DCM),and to explore its effect and mechanism in pyroptosis of cardiomyocytes via the NLRP3/ASC/Caspase-1 pathway.Methods Rats were divided into GXN low-dose,GXN high-dose,digoxin,model control,and normal control groups.The DCM model was induced by multiple intraperitoneal injections of 17.5 mg/kg doxorubicin(DOX).The drug was administered at the same time as the model was established for 10 weeks.After the last administration,echocardiography was used to assess cardiac function indexes.After sacrificing the rats,serum was collected to measure IL-1βand IL-18 levels.RT-PCR was used to detect mRNA expression of NLRP3,ASC,Caspase-1,NF-κB,TXNIP,IL-1β,and IL-18.Immunohistochemistry and immunofluorescence staining and Western Blot were used to assess NLRP3,ASC,Caspase-1,IL-1β,and IL-18,GSDMD and GSDMD-NT protein,and TUNEL staining result.Changes in the microstructure of cardiomyocytes were observed by transmission electron microscopy.Results Compared with the normal control group,IVSs,IVSd,LVPWs,FS,SV,EF,and HR of the model control group were significantly reduced,LVIDs,ESV,and serum IL-1βand IL-18 were significantly increased,NLRP3,ASC,Caspase-1,NF-κB,TXNIP,IL-1βand IL-18 mRNA expression was significantly increased,and NLRP3,ASC,Caspase-1,IL-1β,IL-18 and GSDMD-NT protein expression and the TUNEL staining area were increased significantly,and the microstructure of cardiomyocytes changed significantly.Compared with the model control group,GXN significantly increased IVSs,SV,FS,EF,and HR,significantly reduced LVIDs,ESV,and the serum levels of IL-1βand IL-18,and reduced NLRP3,ASC,Caspase-1,NF-κB,TXNIP,IL-1β,and IL-18 mRNA expression,NLRP3,ASC,Caspase-1,IL-1β,IL-18 and GSDMD-NT protein expression,and the TUNEL staining area.Additionally,the microstructure was improved significantly.Conclusions GXN alleviates cardiomyocyte pyroptosis in rats with DCM by inhibiting the NLRP3/ASC/Caspase-1 pathway.