NR4A1 Aggravates Myocardial Ischaemia-Reperfusion Injury by Inhibiting OPA1-Mediated Mitochondrial Fusion

Overview

Journal J Cardiovasc Transl Res

Publisher Springer

Specialty Cardiology & Vascular Diseases

Date 2023 May 30

PMID 37249897

Authors

Muding Li

Yingyun Hu

Hao Zhou

Yundai Chen

Affiliations

Soon will be listed here.

Abstract

Mitochondrial fusion is an important process that protects the myocardium. However, mitochondrial fusion is often inhibited in myocardial ischaemia-reperfusion injury (IR). The upstream mechanism of this effect is unclear. Nuclear receptor subfamily 4 group A member 1 (NR4A1) can aggravate myocardial IR and increase the level of oxidative stress, thereby affecting mitochondrial function and morphology. Inhibiting NR4A1 can improve oxidative stress levels and mitochondrial function and morphology, thereby reducing IR. Downregulating NR4A1 increases the expression level of the mitochondrial fusion-related protein optic atrophy 1 (OPA1), which is associated with these benefits. Inhibiting OPA1 expression with MYLS22 abrogates the effects of NR4A1 downregulation on IR. Furthermore, NR4A1 disrupts mitochondrial dynamics and activates the STING and NF-κB pathways. Insufficient mitochondrial fusion and increased apoptosis and inflammatory reactions worsen irreversible damage to cardiomyocytes. In conclusion, NR4A1 can exacerbate IR by inhibiting OPA1, causing mitochondrial damage.

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