Long Noncoding RNA XIST Regulates Myocardial Infarction via miR-486-5p/SIRT1 Axis.

Abstract

Myocardial infarction (MI) is severe heart disease leading to the death worldwide. Long noncoding RNAs (lncRNAs) play a vital role in progression of numerous heart diseases. In the present study, we examined the effects of lncRNA XIST and underlying mechanism on hypoxia-induced apoptosis. In vitro model of MI was established by inducing hypoxia in H9c2 cells. CCK-8 assay was used to measure the cell viability in hypoxia-induced H9c2 cells. The rate of cell apoptosis was assessed by using caspase-3 assay. Transfection was carried out to upregulate the expressions of lncRNA XIST, and miR-486-5p. RT-qPCR was used to measure the levels of lncRNA XIST and miR-486-5p. Also, the relation between XIST and miR-486-5p was confirmed by using Luciferase reporter assay. Our findings revealed that hypoxia significantly downregulated the expressions of XIST. Also, the cell viability markedly increased due to the overexpression of XIST in hypoxia-induced H9c2 cells, while overexpression of XIST significantly reduced the cell apoptosis in hypoxia-induced H9c2 cells. On the other hand, opposite effects were observed due to the downregulation of XIST in hypoxia-induced H9c2 cells. Moreover, XIST negatively regulated the expression of miR-4486-5p and upregulation of XIST inhibited hypoxic injury by downregulating miR-486-5p. Furthermore, SIRT1 expression was negatively regulated by miR-486-5p. We concluded that lncRNA XIST might provide protection against injury induced by hypoxia via miR-486-5p/SIRT1 axis.

• Authors: Jiayong Xie
• Journal: Applied biochemistry and biotechnology (Appl Biochem Biotechnol) Vol. 195 Issue 2 Pg. 725-734 (Feb 2023) ISSN: 1559-0291 [Electronic] United States
• PMID: 36129595 (Publication Type: Journal Article)
• Copyright: © 2022. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

Chemical References

• MicroRNAs
• RNA, Long Noncoding
• Sirtuin 1
• MIRN486 microRNA, rat

Topics

• Rats
• Apoptosis (genetics)
• Hypoxia (metabolism)
• MicroRNAs (genetics, metabolism)
• Myocardial Infarction (genetics)
• Myocytes, Cardiac (metabolism)
• RNA, Long Noncoding (genetics, metabolism)
• Sirtuin 1 (genetics, metabolism)