Abstract
This study aimed to examine the role and molecular mechanism of the nuclear factor κB (NFκB)/serine protease inhibitor A3 (SerpinA3) interaction in myocardial ischemia-reperfusion (IR) injury. First, a rat model for myocardial ischemia-reperfusion injury was established, using 2,3,5-triphenyltetrazolium chloride to measure the size of the myocardial infarction. Pathological variations in myocardial tissue were detected using hematoxylin-eosin staining. Flow cytometry and terminal deoxynucleotidyl transferase biotin-dUTP nick end labeling (TUNEL) staining were used to measure cell death in the rat model. The SerpinA3 mRNA and protein expressions in the myocardium of IR-model rats were remarkably higher than those in the control group. Furthermore, the oxidative, inflammatory, and apoptotic activities of the myocardial tissue of SerpinA3-knockdown (KD) rats were significantly improved compared to those in the WT group. SerpinA3-KD also contributed to the recovery of cardiac function in IR-model rats. Additionally, silencing of SerpinA3 inhibited p65 phosphorylation in myocardial tissues and reduced H2O2-induced inflammation, oxidative stress, and apoptosis in myocardial cells. The expression of SerpinA3 increased in myocardial tissue after IR stimulation. Knockdown of SerpinA3 can deactivate NF-κB and reduce inflammation, oxidative stress, and apoptosis in vivo and in vitro, thereby lessening myocardial injury caused by IR. In conclusion, SerpinA3 promotes myocardial infarction in rat and cell-based models by activating NF-κB. However, the mechanism by which increased Serpina3 expression causes downstream NF-κB activation to mediate the proposed, pathological effects in myocardial IR injury remain untested and worthy of future investigations.
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Gang Zhang and Xiaofeng Sun designed the study; Gang Zhang, Xiaofeng Sun, Dongying Zhang, Xiwen Zhang, Kun Yu performed the research and analyzed the data; Kun Yu contributed new methods; Gang Zhang wrote the paper.
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12033_2023_982_MOESM1_ESM.png
Supplementary Fig. 1: SerpinA3-knockdown inhibited apoptosis in H2O2-treated murine cardiomyocytes. (A) WB were performed to determine the expressions of SerpinA3, P65, and phosphorylated P65 in H2O2-treated H9c2 cells at the mRNA and protein levels (B) Colony formation assay indicated cell growth rate. (C) Annexin V-FITC and PI flow cytometry indicated the proportion of cells undergoing apoptosis due to H2O2 exposure
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Zhang, G., Sun, X., Zhang, D. et al. SerpinA3 Promotes Myocardial Infarction in Rat and Cell-based Models. Mol Biotechnol (2023). https://doi.org/10.1007/s12033-023-00982-x
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DOI: https://doi.org/10.1007/s12033-023-00982-x