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本文(LncRNA MIR22HG调节miR-132-3p_TLR2轴对急性心肌梗死小鼠心肌细胞凋亡和心室重构的影响.pdf)为本站会员(哎呦****中)主动上传,蜗牛文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知蜗牛文库(发送邮件至admin@wnwk.com或直接QQ联系客服),我们立即给予删除!

LncRNA MIR22HG调节miR-132-3p_TLR2轴对急性心肌梗死小鼠心肌细胞凋亡和心室重构的影响.pdf

1、广西医科大学学报JOURNAL OF GUANGXI MEDICAL UNIVERSITY2023Jul.40(7)LncRNA MIR22HG调节miR-132-3p/TLR2轴对急性心肌梗死小鼠心肌细胞凋亡和心室重构的影响*李延民1,冯艳2,魏燕云3,王献忠1(河北省邯郸市第一医院1.心内二科;2.检验科;3.新生儿科,邯郸056002)摘要目的:探讨长链非编码RNA miR-22宿主基因(lncRNA MIR22HG)调节miR-132-3p/Toll样受体2(TLR2)轴对急性心肌梗死(AMI)小鼠心肌细胞凋亡和心室重构的影响。方法:取C57BL/6J小鼠随机分为sham组、AMI组、

2、AMI+sh-NC组、AMI+sh-MIR22HG组、AMI+sh-MIR22HG+antagomir-NC组、AMI+sh-MIR22HG+antagomir-132-3p组,每组10只,除去sham组外,其它组都进行冠状动脉左前降支结扎,sham组只开胸不结扎冠状动脉,其中AMI+sh-NC组、AMI+sh-MIR22HG组、AMI+sh-MIR22HG+antagomir-NC组、AMI+sh-MIR22HG+antagomir-132-3p组小鼠分别相对应的对尾静脉注射sh-NC、sh-MIR22HG、sh-MIR22HG+antagomir-NC、sh-MIR22HG+antagom

3、ir-132-3p。超声心动图评估小鼠心室重构和心脏功能;HE染色和Masson染色观察心肌组织病理学变化及纤维化;RT-qPCR检测心肌组织MIR22HG、miR-132-3p表达;TUNEL法检测心肌细胞凋亡;Western blotting检测心肌组织B细胞淋巴瘤-2(Bcl-2)、激活型半胱氨酸蛋白酶-3(cleved caspase-3)/半胱氨酸蛋白酶-3(cas-pase-3)、型胶原蛋白(collagen)、collagen和-平滑肌肌动蛋白(-SMA)表达;双荧光素酶报告基因实验分别验证MIR22HG和miR-132-3p、miR-132-3p和TLR2的关系。结果:与sha

4、m组比较,AMI组小鼠心功能显著降低,心肌组织损伤、心肌纤维化加重,心肌细胞凋亡率、MIR22HG、TLR2、cleved caspase-3/caspase-3、collagen、collagen和-SMA蛋白表达水平显著升高,miR-132-3p和Bcl-2蛋白表达降低(P0.05);与AMI+sh-NC组比较,AMI+sh-MIR22HG组小鼠心功能改善,心肌组织损伤、心肌纤维化减轻,心肌细胞凋亡率、MIR22HG、TLR2、cleved caspase-3/caspase-3、collagen、collagen和-SMA蛋白表达水平显著降低,miR-132-3p和Bcl-2蛋白表达上升

5、(P0.05);下调miR-132-3p减弱了敲减MIR22HG对心肌组织的保护作用;双荧光素酶报告基因实验结果显示,MIR22HG靶向调控miR-132-3p表达,miR-132-3p靶向负调控TLR2表达。结论:抑制MIR22HG表达可通过调节miR-132-3p/TLR2轴抑制AMI小鼠心肌细胞凋亡,改善小鼠心室重构。关键词急性心肌梗死;lncRNAMIR22HG;miR-132-3p;TLR2;细胞凋亡;心室重构中图分类号:R542.2文献标志码:A文章编号:1005-930X(2023)07-1123-09DOI:10.16190/ki.45-1211/r.2023.07.007In

6、fluences of lncRNA MIR22HG on cardiomyocyte apoptosis and ventricular remodeling inmice with acute myocardial infarction by regulating miR-132-3p/TLR2 axisLi Yanmin1,Feng Yan2,Wei Yanyun3,Wang Xianzhong1.(1.Department of Cardiology;2.Clinical laboratory;3.Neonatal Department,First Hospital of Handan

7、 City,Hebei Province,Handan 056002,China)AbstractObjective:To explore the influences of long non-coding RNA miR-22 host gene(lncRNA MIR-22HG)on cardiomyocyte apoptosis and ventricular remodeling in mice with acute myocardial infarction(AMI)by regulating miR-132-3p/Toll-like receptor 2(TLR2)axis.Meth

8、ods:C57BL/6J mice were randomly grouped in-to sham group,AMI group,AMI+sh-NC group,AMI+sh-MIR22HG group,AMI+sh-MIR22HG+antagomir-NCgroup,and AMI+sh-MIR22HG+antagomir-132-3p group,with 10 in each group.Except that the sham group onlyunderwent thoracotomy without coronary artery ligation,all the other

9、 groups underwent ligation of the left anteri-or descending coronary artery.Among them,mice in the AMI+sh-NC group,AMI+sh-MIR22HG group,AMI+sh-MIR22HG+antagomir-NC group,and AMI+sh-MIR22HG+antagomir-132-3p group were injected with sh-NC,sh-MIR22HG,sh-MIR22HG+antagomir-NC,and sh-MIR22HG+antagomir-132

10、-3p corresponding to thetail vein,respectively.Echocardiography was used toassess ventricular remodeling and cardiac function in*基金项目:河北省卫生厅医学科学研究重点课题计划项目(No.20160335);邯郸市科学技术研究与发展计划项目(No.1623208064-5)收稿日期:2022-06-22 1123广西医科大学学报2023 Jul.40(7)mice;HE staining and Masson staining were applied to obse

11、rve myocardial histopathological changes and fibro-sis;real-time fluorescence quantitative polymerase chain reaction(RT-qPCR)was applied to detect the expres-sions of MIR22HG and miR-132-3p in myocardial tissue;TUNEL method was applied to detect cardiomyocyteapoptosis;western blotting was applied to

12、 detect the expressions of myocardial tissue B-cell lymphoma-2(Bcl-2),activated cysteine protease-3(cleved caspase-3)/cysteine protease-3(caspase-3),type collagen(collagen)I,collagen and-smooth muscle actin(-SMA);and dual-luciferase reporter assays were applied to verify the re-lationship between MI

13、R22HG and miR-132-3p,miR-132-3p and TLR2,respectively.Results:Compared withthe sham group,the cardiac function of the mice in the AMI group obviously decreased,and myocardial tissuedamage and myocardial fibrosis were aggravated.The cardiomyocyte apoptosis rate,the expressions ofMIR22HG,TLR2,cleved c

14、aspase-3/caspase-3,collagen,collagen and-SMA proteins obviously increased,while the protein expressions of miR-132-3p and Bcl-2 decreased(P0.05).Compared with the AMI+sh-NCgroup,the cardiac function of the mice in the AMI+sh-MIR22HG group was obviously improved,and myocardialtissue damage and myocar

15、dial fibrosis were alleviated;the cardiomyocyte apoptosis rate,the expressions ofMIR22HG,TLR2,cleved caspase-3/caspase-3,collagen,collagen and-SMA proteins obviously decreased,while the protein expressions of miR-132-3p and Bcl-2 increased(P0.05);down-regulation of miR-132-3p at-tenuated the protect

16、ive effect of knockdown of MIR22HG on myocardial tissue;the results of the dual-luciferasereporter gene assay showed that MIR22HG targeting regulated the expression of miR-132-3p,and miR-132-3ptargeting negatively regulated the expression of TLR2.Conclusion:Inhibition of MIR22HG expression can in-hibit cardiomyocyte apoptosis and improve ventricular remodeling in AMI mice by regulating the miR-132-3p/TLR2 axis.Keywordsacute myocardial infarction;long non-coding RNA miR-22 host gene;miR-132-3p;To

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