miR-193b-5p对缺血缺氧诱导心肌细胞凋亡的调控作用  

Regulatory effect of miR-193b-5p on apoptosis of cardiomyocytes induced by ischemia-hypoxia

作　　者：谢晓泳 陈宁园 潘尚领 彭均华 XIE Xiaoyong;CHEN Ningyuan;PAN Shangling;PENG Junhua(Department of Pathophysiology,School of Basic Medicine of Guangxi Medical University,Nanning 530021,China)

机构地区：[1]广西医科大学基础医学院病理生理学教研室,广西南宁530021

出　　处：《中国病理生理杂志》2025年第4期637-644,共8页Chinese Journal of Pathophysiology

基　　金：国家自然科学基金资助项目(No.32060188)。

摘　　要：目的:探讨微小RNA-193b-5p(microRNA-193b-5p,miR-193b-5p)对心肌细胞在缺血缺氧(ischemia-hypoxia,IH)环境中凋亡的影响及可能机制。方法:体外培养人心肌AC16细胞,并构建心肌细胞IH模型。将心肌细胞分为对照组、IH组、IH+miR-193b-5p inhibitor组和IH+inhibitor NC组。对照组给予正常培养;IH组使用缺氧小室处理24 h诱导心肌细胞凋亡;IH+miR-193b-5p inhibitor组和IH+inhibitor NC组以相同的操作方法转染相应的质粒后进行IH处理24 h诱导心肌细胞凋亡。RT-qPCR检测IH后心肌细胞中miR-193b-5p表达情况。CCK-8法检测心肌细胞活力。检测细胞上清中的乳酸脱氢酶(lactate dehydrogenase,LDH)以了解心肌细胞损伤情况。流式细胞术检测细胞凋亡率。Western blot检测Bax、Bcl-2和cleaved caspase-3的蛋白水平。最后,通过RNA测序并结合生物信息学方法预测下游靶基因,RT-qPCR和Western blot验证miR-193b-5p与环指蛋白4[RING(really interesting new gene)finger protein 4,RNF4]基因的相互作用关系。结果:与对照组相比,miR-193b-5p在IH心肌细胞中高表达。此外,在IH环境下,心肌细胞活力下降,细胞损伤及细胞凋亡增加;而抑制miR-193b-5p的表达水平可提高心肌细胞活力,减少细胞损伤,缓解IH诱导的心肌细胞凋亡水平。RNA测序结果以及进一步实验验证了miR-193b-5p可能作用于RNF4基因发挥作用。结论:抑制miR-193b-5p能减轻心肌细胞IH损伤和凋亡,其机制可能是抑制miR-193b-5p通过介导RNF4基因表达从而发挥抗凋亡的心肌保护作用。AIM:To explore the influence of microRNA-193b-5p(miR-193b-5p)on apoptosis of cardiomyocytes in an ischemia-hypoxia(IH)environment and the possible mechanism.METHODS:Human AC16 cardiomyocytes were cultured in vitro,and an IH model of cardiomyocytes was established.The cardiomyocytes were divided into control group,IH group,IH+miR-193b-5p inhibitor group,and IH+inhibitor NC group.The cells in control group were regularly cultured,those in IH group were treated with a hypoxia chamber for 24 h to induce cardiomyocyte apoptosis,while those IH+miR-193b-5p inhibitor and IH+inhibitor NC groups were transfected with corresponding plasmids by the same operation method and then underwent IH treatment for 24 h to induce cardiomyocyte apoptosis.RT-qPCR was used to detect the expression of miR-193b-5p in cardiomyocytes after IH.The viability of cardiomyocytes was detected by CCK-8 method.Lactate dehydrogenase(LDH)was detected to understand the damage of cardiomyocytes.The apoptotic rate was detected by flow cytometry.The protein levels of Bax,Bcl-2 and cleaved caspase-3 were detected by Western blot.Finally,downstream target genes were predicted by RNA sequencing combined with bioinformatics methods,and the interaction relationship between miR-193b-5p and RING(really interesting new gene)finger protein 4(RNF4)gene was verified by RT-qPCR and Western blot experiments.RESULTS:Compared with control group,miR-193b-5p was highly expressed in cardiomyocytes with IH.Furthermore,in the IH environment,the viability of cardiomyocytes decreased,and cell damage and cell apoptosis increased,while inhibiting the expression level of miR-193b-5p could enhance the viability of cardiomyocytes,reduce cell damage,and alleviate the apoptosis of cardiomyocytes induced by IH.The results of RNA sequencing and further experiments verified that miR-193b-5p might act on the RNF4 gene to exert its effect.CONCLUSION:Inhibition of miR-193b-5p can alleviate the IH injury and apoptosis of cardiomyocytes.The mechanism might be that miR-193b-5p inhibition exer

关 键 词：心肌细胞 缺血 缺氧 微小RNA-193b-5p 细胞凋亡 

分 类 号：R542.2[医药卫生—心血管疾病] R363[医药卫生—内科学] Q255[医药卫生—临床医学]