摘要
目的探讨野黄芩苷(Scutellarin,Scu)调控miR-26a-3p/Survivin分子轴对大鼠心肌缺血/再灌注损伤(Myocardial ischemia/reperfusion injury,MIRI)的影响及其机制。方法将50只SD大鼠随机分为假手术组(Sham)、模型组(Model)、野黄芩苷组(Scu)、miR-26a-3p激动剂组(agomir)和野黄芩苷+miR-26a-3p agomir组(Scu+agomir),每组10只。结扎大鼠冠状动脉前降支建立MIRI动物模型,各组大鼠于术前及术中分别给予20 mg/kg Scu或10 nmol agomir干预,Sham组和Model组大鼠给予等量溶剂。术后48 h,采用超声心动图检查大鼠心功能;苏木素-伊红(HE)染色检测大鼠心肌组织病理学改变;生化试剂盒检测大鼠血清中心肌损伤标志物肌酸激酶同工酶(CreatinekinaseisoenzymeMB,CK-MB)、乳酸脱氢酶(Lactate dehydrogenase,LDH)、心肌肌钙蛋白I(Cardiac troponin I,cTnI)水平以及心肌组织中氧化水平标志物丙二醛(Malondialdehyde,MDA)、超氧化物歧化酶(Superoxide dismutase,SOD)、谷胱甘肽过氧化物酶(Glutathione peroxidase,GSH-Px)含量;TUNEL染色检测大鼠心肌细胞凋亡水平;qRT-PCR检测大鼠心肌组织中miR-26a-3p及生存素(Survivin)mRNA表达水平;Western blot检测大鼠心肌组织中Survivin、细胞周期蛋白依赖激酶抑制因子(p21)及cleaved-caspase 3蛋白表达水平。结果与Sham组比较,Model组大鼠心肌组织病理损伤严重,心功能LVEDP水平及血清中CK-MB、LDH、cTnI水平显著升高(P<0.01),LVESP、LVEF、LVFS水平显著降低(P<0.01);心肌组织细胞凋亡水平及MDA水平显著升高(P<0.01),SOD、GSH-Px水平显著降低(P<0.01);同时,心肌组织中miR-26a-3p及cleaved-caspase 3蛋白表达水平显著升高(P<0.01),而p21蛋白及Survivin mRNA和蛋白表达水平显著降低(P<0.01)。与Model组比较,Scu组大鼠心肌组织病理损伤明显改善,心功能LVEDP水平及血清中CK-MB、LDH、cTnI水平显著升高(P<0.01),LVESP、LVEF、LVFS水平显著升高(P<0.01);心肌组织细胞凋亡水平及MDA水平显著降低(P<0.01),SOD、GSH-Px水平显著升高(P<0.01);同时,心肌组织中miR-26a-3p及cleaved-caspase 3蛋白表达水平显著降低(P<0.01),p21蛋白及Survivin mRNA和蛋白表达水平显著升高(P<0.01)。然而,使用miR-26a-3p激动剂干预可明显逆转Scu对大鼠MIRI的改善作用。结论Scu可改善MIRI大鼠心功能及心肌损伤,抑制心肌细胞凋亡,其作用机制可能与调控miR-26a-3p/Survivin分子轴有关。
Objective To investigate the effect of Scutellarin(Scu)regulating miR-26a-3p/Survivin molecular axis on myocardial ischemia/reperfusion injury(MIRI)in rats and its mechanism.Methods Fifty SD rats were randomly divided into sham group,model group,scutellarin group(Scu),miR-26a-3p agomir group(agomir)and scutellarin+miR-26a-3p agomir group(Scu+agomir)with 10 rats in each group.The animal model of MIRI was established by ligating the anterior descending coronary artery.The rats in each group were given 20 mg/kg Scu or 10 nmol agomir before and during operation,respectively,and the rats in sham group and model group were given the same amount of solvent.At 48 h after operation,the cardiac function of rats was examined by echocardiography.The pathological changes of myocardial tissue were detected by HE staining.The levels of myocardial injury markers creatine kinase isoenzyme MB(CK-MB),lactate dehydrogenase(LDH)and cardiac troponin I(cTnI)in serum and the contents of oxidative markers Malondialdehyde(MDA),superoxide dismutase(SOD)and glutathione peroxidase(GSH-Px)in myocardial tissue were detected by biochemical kit.The apoptosis of rat cardiomyocytes was detected by TUNEL staining.The mRNA expression levels of miR-26a-3p and Survivin in rat myocardium were detected by qRT-PCR.Expression levels of Survivin,cyclin-dependent kinase inhibitor(p21)and cleaved-caspase 3 were detected by Western blot.Results Compared with sham group,the pathological damage of myocardial tissue in the model group was serious,the levels of cardiac function LVEDP and serum CK-MB,LDH and cTnI significantly increased(P<0.01),and the levels of LVESP,LVEF and LVFS significantly decreased(P<0.01).The apoptosis level and MDA level of myocardial tissue significantly increased(P<0.01),while the SOD and GSH-Px levels significantly decreased(P<0.01).Meanwhile,the expression levels of miR-26a-3p and cleaved-caspase 3 protein significantly increased(P<0.01),the p21 protein and Survivin mRNA and protein expression levels significantly decreased(P<0.01).Compared with model group,the pathological injury of myocardium in Scu group was significantly improved,the levels of cardiac function LVEDP and serum CK-MB,LDH and cTnI significantly decreased(P<0.01),and the levels of LVESP,LVEF and LVFS significantly increased(P<0.01).The apoptosis level and MDA level of myocardial tissue significantly decreased(P<0.01),while the SOD and GSH-Px levels significantly increased(P<0.01).Meanwhile,the expression levels of miR-26a-3p and cleaved-caspase 3 protein significantly decreased(P<0.01),the p21 protein and Survivin mRNA and protein expression levels significantly increased(P<0.01).However,intervention with miR-26a-3p agomir could significantly reverse the improvement effect of Scu on MIRI in rats.Conclusion Scu can improve cardiac function and myocardial injury and inhibit myocardial cell apoptosis in MIRI rats,and its mechanism may be related to the regulation of miR-26a-3p/Survivin molecular axis.
作者
黄建成
刘佳
刘璞娟
董彦博
王军
李红英
HUANG Jiancheng;LIU Jia;LIU Pujuan;DONG Yanbo;WANG Jun;LI Hongying(The First Hospital of Hebei Medical University,Shijiazhuang 050030,China)
出处
《世界科学技术-中医药现代化》
北大核心
2025年第5期1360-1367,共8页
Modernization of Traditional Chinese Medicine and Materia Medica-World Science and Technology
基金
河北省卫生健康委医学科学研究课题计划项目(20210594):miR-26a在大鼠H9c2细胞缺氧损伤的表达及调控作用,负责人:黄建成。
