Abstract:
En
|
Text:
En
|
PDF:
En
Abstract Introduction: This study’s objective is to investigate the effect of downregulation of micro ribonucleic acid (miR)-124a on myocardial injury after ischemia reperfusion (I/R) in rats. Methods: Sprague Dawley (SD) rats (n=20) were divided into four groups - sham, I/R, I/R+miR-124a antagomir (I/R+ant-miR-124a), and I/R+ant-normal control (NC). The pathomorphological and infarct size variance of injured myocardial tissues with IR were conducted with hematoxylin (HE) and triphenyltetrazolium chloride (TTC) staining. The expression levels of miR-124a, BAX, nuclear factor kappa B (NF-KB), Notch1, and Hes1 were examined by quantitative real-time polymerase chain reaction or Western blot in myocardium. The inflammatory cytokines interleukin (IL)-6, IL-1β, and tumor necrosis factor alpha (TNF-α) were detected by the enzyme-linked immunosorbent assay, as well as the activity of lactate dehydrogenase (LDH) and creatine kinase (CK) in serum by colorimetry. Results: The expression of miR-124a was increased in the I/R group. Compared with I/R and I/R+ant-NC groups, after downregulating miR-124a, the expression of IL-6, IL-1β, TNF-α, BAX, NF-KB, LDH, and CK were decreased, but the expression of Notch1 and Hes1 were increased. In HE staining, myocardial tissue edema, red blood cell exudation, and myocardial fiber arrangement disorder were accompanied by inflammatory cell infiltration and local necrosis in the I/R group. However, the pathological injury of myocardial tissue was alleviated after downregulating miR-124a. Additionally, TTC results showed that the myocardial infarction area was decreased in the I/R+ant-miR-124a group. Conclusion: Downregulation of miR-124a expression through Notch pathway can significantly reduce myocardial damage after 24 hours of I/R in SD rats. Therefore, miR-124a may become a potential therapeutic target for I/R injury. Introduction studys study s miR124a miRa miR 124a I R (I/R Methods (SD n=20 n20 n 20 (n=20 sham I/R+miR124a IRmiR124a IRmiRa I/R+miR I/R+antmiR124a, IRantmiR124a IRantmiRa I/R+ant , ant (I/R+ant-miR-124a) I/R+antnormal IRantnormal normal NC. NC . (NC) (HE (TTC staining miR124a, 124a, BAX NFKB, NFKB NF KB (NF-KB) Hes realtime real time myocardium IL6, IL6 IL 6, 6 (IL)-6 IL1β, IL1β ILβ 1β, 1β β IL-1β TNFα TNF α (TNF-α enzymelinked enzyme linked assay LDH (LDH (CK colorimetry Results group I/R+antNC IRantNC IL-6 TNFα, α, TNF-α KB, NF-KB edema exudation However miR124a. 124a. Additionally I/R+antmiR124a Conclusion 2 Therefore n=2 n2 (n=2 IRmiR antmiR124a antmiR IRantmiR IRant (I/R+ant-miR-124a antnormal (NC (NF-KB (IL)- antNC IL- n= (n= antmiRa (IL) (n (IL