阿司匹林调节miR-340-5p/HMGB1/TLR4通路对大鼠心肌缺血/再灌注损伤的影响 点击下载
论文标题: 阿司匹林调节miR-340-5p/HMGB1/TLR4通路对大鼠心肌缺血/再灌注损伤的影响
英文标题:
中文摘要: 目的 探讨阿司匹林(Asp)通过调节微RNA-340-5p(miR-340-5p)/高迁移率族蛋白1(HMGB1)/Toll样受体4(TLR4)通路对大鼠心肌缺血/再灌注(I/R)损伤的影响。方法将雄性SD大鼠分为假手术(Sham)组(开胸不结扎)、I/R组(构建I/R损伤模型)、Asp预处理(I/R+Asp)组(Asp预处理7d+造模)、I/R+Asp+in-miR-340-5p组[Asp预处理7d+提前转染miR-340-5p抑制物+造模]和I/R+Asp+HMGB1组(Asp预处理7d+提前转染过表达HMGB1+造模),每组20只。检测各组大鼠心肌损伤指标(乳酸脱氢酶、肌酸激酶同工酶MB、心肌肌钙蛋白Ⅰ)、炎症和氧化应激指标(髓过氧化物酶、超氧化物歧化酶、谷胱甘肽过氧化物酶、丙二醛)水平,观察其心肌组织病理改变,检测其心肌梗死面积、细胞凋亡情况以及心肌组织中miR-540-5p和HMGB1、TLR4蛋白的表达情况;以大鼠心肌细胞H9C2为对象,考察miR-340-5p与HMGB1的靶向关系。结果Asp预处理可显著抑制I/R损伤模型大鼠血清心肌损伤指标水平的升高,可减轻炎症反应、抑制氧化应激反应、缩小心肌梗死面积并减少细胞凋亡,可显著上调miR-340-5p的表达并下调HMGB1、TLR4蛋白的表达(P<0.05);抑制miR-340-5p或过表达HMGB1均可逆转Asp的上述保护作用(P<0.05)。细胞实验结果显示,miR-340-5p可靶向负调控HMGB1的表达(P<0.05)。结论Asp可通过调节miR-340-5p/HMGB1/TLR4通路来减轻大鼠炎症反应和氧化应激,减少心肌组织中的细胞凋亡,进而发挥对心肌I/R损伤的保护作用。
英文摘要: OBJECTIVE To investigate the effects of a spirin (Asp) on myocardia l ischemia/reperfusion (I/R) injury by regulating microRNA -340-5p (miR-340-5p)/high mobility group box 1 (HMGB1)/Toll-like receptor 4 (TLR4) pathway. METHODS Male SD rats were divided into sham operation (Sham)group(thoracotomy without ligation ),I/R group (I/R injury model was constructed ),and Asp pretreatment (I/R+Asp)group(7 d of Asp pretreatment+modeling ),I/R+Asp+in-miR-340-5p group [Asp pretreatment 7 d+transfection with miR -340-5p inhibitor 48 h before modeling+modeling ] and I/R+Asp+HMGB 1 group (7 d of Asp pretreatment+transfection with overexpression of HMGB 1 48 h before modeling+modeling ),with 20 rats in each group. The levels of myocardial injury indexes [lactate dehydrogenase ,creatine kinase isoenzyme -MB,cardiac troponin Ⅰ], inflammation and oxidative stress indexes [myeloperoxidase,superoxide dismutase ,glutathione peroxidase ,malondialdehyde] were detected in each group ,and the pathological changes of myocardial tissue were observed . The myocardial infarction area ,cell apoptosis and the expression of miR -540-5p,HMGB1 and TLR 4 in myocardial tissue were detected . Cardiomyocyte H 9C2 of rats was used as the object to investigate the targeting relationship between miR -340-5p and HMGB 1. RESULTS Asp pretreatment could significantly inhibit the increase of serum myocardial injury indexes in I/R model rats ,reduce inflammation and inhibit oxidative stress ,reduce myocardial infarct size and apoptosis ,and significantly up -regulated the expression of miR -340-5p and down-regulated the expression of HMGB 1 and TLR 4 proteins(P<0.05);inhibition of miR -340-5p or overexpression of HMGB 1 could reverse the above protective effects of Asp (P<0.05). miR-340-5p could target and negatively regulate HMGB 1 expression (P<0.05). CONCLUSIONS Asp can reduce inflammation and oxidative stress by regulating the miR -340-5p/HMGB1/TLR4 pathway,reduce apoptosis i n myocardial tissue ,and play a protective role against myocard ial I/R injury .
期刊: 2022年第33卷第20期
作者: 陈兴华,张继倬,韩露
英文作者: CHEN Xinghua,ZHANG Jizhuo,HAN Lu
关键字: 阿司匹林;微RNA-340-5p;高迁移率族蛋白1;Toll样受体4;心肌缺血/再灌注;心肌损伤;大鼠
KEYWORDS: aspirin; microRNA-340-5p; high mobility
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