MiR-130a-3p regulates FUNDC1-mediated mitophagy by targeting GJA1 in myocardial ischemia/reperfusion injury

Understanding the complex pathogenesis in myocardial ischemia/reperfusion (I/R) injury (IRI) is an urgent problem in clinical trials. Increasing pieces of evidence have suggested that miRNAs are involved in the occurrence and development of heart diseases by regulating mitochondria-related gene expr...

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Published in:Cell death discovery 2023-02, Vol.9 (1), p.77-77, Article 77
Main Authors: Yan, Yan, Tian, Liu-yang, Jia, Qian, Han, Yang, Tian, Yu, Chen, Hui-ning, Cui, Sai-jia, Xi, Jie, Yao, Yong-ming, Zhao, Xiao-jing
Format: Article
Language:English
Subjects:
631/80/39/2348
631/80/82/39/2348
Apoptosis
Biochemistry
Biomedical and Life Sciences
Cardiomyocytes
Cell Biology
Cell Cycle Analysis
Cell viability
Clinical trials
Connexin 43
Electron microscopy
Gap junctions
Gene expression
Heart diseases
Hypoxia
Ischemia
Life Sciences
Membrane potential
Mitochondria
Mitophagy
Myocardial infarction
Myocardial ischemia
Overexpression
Oxidative phosphorylation
Phosphorylation
Quality control
Reactive oxygen species
Reperfusion
Stem Cells
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Summary:Understanding the complex pathogenesis in myocardial ischemia/reperfusion (I/R) injury (IRI) is an urgent problem in clinical trials. Increasing pieces of evidence have suggested that miRNAs are involved in the occurrence and development of heart diseases by regulating mitochondria-related gene expression. Mitochondria have been acknowledged as the key triggers of cardiac I/R injury. However, the potential impact of miR-130a on mitochondria remains unclear in myocardial IRI. Exploring the regulatory mechanism of miR-130a on mitochondria may provide a new target for IRI therapy. In the present study, we found that miR-130a significantly increased in acute myocardial infarction (AMI) patients and myocardial I/R rats. MiR-130a could downregulate the viability of cardiomyocytes and the knockdown of miR-130a could protect the viability of cardiomyocytes under hypoxia-reoxygenation (HR). Over-expression of miR-130a resulted in mitochondrial dysfunction. It was evidenced by decreases in mitochondrial ATP production, mitochondrial membrane potential (MMP), and an increase in reactive oxygen species (ROS) production. However, suppression of miR-130a could protect against mitochondrial damage, show elevation of mitochondrial ATP production rate and MMP, and reduce ROS production. We further explored the effect of miR-130a on the mitochondrial quality control (QMC) system by determining mitochondrial-protein-specific proteases and analyzed mitochondrial morphology by fluorescence imaging and electron microscopy, respectively. It was noted that miR-130a could suppress mitochondrial fusion and FUNDC1-mediated mitophagy to accelerate myocardial IRI. Moreover, we investigated the potential miR-130a targeted mitochondria-related genes to understand the regulatory mechanism of miR-130a in the setting of myocardial IRI. It was revealed that miR-130a targeted GJA1, and GJA1 rescued IRI by enhancing ATP production rate and oxidative phosphorylation, meanwhile protecting cell viability, MMP, and activating mitophagy. In addition, the knockdown of miR-130a significantly activated FUNDC1-mediated mitophagy, while the knockdown of GJA1 reversed the relevant response. Collectively, our findings suggest that miR-130a regulates FUNDC1-mediated mitophagy by targeting GJA1 in myocardial IRI.
ISSN:2058-7716
2058-7716
DOI:10.1038/s41420-023-01372-7