HIF1A and myocardial infarction: The expression of miR-19a-3p carried by cardiomyocyte exosomes is increased after myocardial infarction and H2O2 treatment, which can target hypoxia-inducible factor alpha (HIF-1α)'s downregulation to inhibit angiogenesis and endothelial cell proliferation, inhibiting miR-19a-3p can improve cardiac function and promote angiogenesis.