CHEN Xinghua,ZHANG Jizhuo,HAN Lu.Effects of aspirin on myocardial injury in rats with myocardial ischemia/reperfusion by regulating miR-340-5p/HMGB1/TLR4 pathway[J].ZHONGGUO YAOFANG,2022,33(20):2508-2513.
CHEN Xinghua,ZHANG Jizhuo,HAN Lu.Effects of aspirin on myocardial injury in rats with myocardial ischemia/reperfusion by regulating miR-340-5p/HMGB1/TLR4 pathway[J].ZHONGGUO YAOFANG,2022,33(20):2508-2513. DOI: 10.6039/j.issn.1001-0408.2022.20.15.
Effects of aspirin on myocardial injury in rats with myocardial ischemia/reperfusion by regulating miR-340-5p/HMGB1/TLR4 pathway
To investigate the effects of aspirin (Asp) on myocardial 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
2
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+HMGB1 group (7 d of Asp pretreatment+transfection with overexpression of HMGB1 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 TLR4 in myocardial tissue were detected. Cardiomyocyte H9C2 of rats was used as the object to investigate the targeting relationship between miR-340-5p and HMGB1.
RESULTS
2
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 HMGB1 and TLR4 proteins (
P
<0.05); inhibition of miR-340-5p or overexpression of HMGB1 could reverse the above protective effects of Asp (
P
<0.05). miR-340-5p could target and negatively regulate HMGB1 expression (
P
<0.05).
CONCLUSIONS
2
Asp can reduce inflammation and oxidative stress by regulating the miR-340-5p/HMGB1/TLR4 pathway, reduce apoptosis in myocardial tissue, and play a protective role against myocardial I/R injury.
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references
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