期刊
JOURNAL OF CARDIOVASCULAR TRANSLATIONAL RESEARCH
卷 14, 期 1, 页码 173-183出版社
SPRINGER
DOI: 10.1007/s12265-020-09972-9
关键词
microRNA-490-3p; Autophagy-related 4B cysteine; Autophagy; Apoptosis; Ischemia reperfusion
The study found that the expression of miR-490-3p is decreased and that of ATG4B is increased during ischemia reperfusion. Inhibiting miR-490-3p or overexpressing ATG4B can promote autophagy to reduce myocardial IR injury.
We investigated the potential role of miR-490-3p in ischemia reperfusion (IR) injury. We first determined the expression of miR-490-3p and autophagy-related 4B cysteine (ATG4B) in IR. Then, to explore whether miR-490-3p would affect autophagy, apoptosis, and IR injury, we evaluated apoptosis, autophagy, and infarct size via gain- and loss-of-function experiments. Furthermore, we used adenovirus to enhance or inhibit the expression of ATG4B, and then measured autophagy, apoptosis, and IR injury. miR-490-3p was downregulated in the hearts during the process of IR, while ATG4B was upregulated. The inhibition of miR-490-3p or overexpression of ATG4B could promote the expression of LC3II, increase the autolysosomes, inhibit the expression of p62, and reduce infarct size. On all accounts, the inhibition of miR-490-3p could promote autophagy to reduce myocardial IR injury by upregulating ATG4B, a finding that provides new insights for the protective mechanism of autophagy in IR.
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