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A mammalian mirtron miR-1224 promotes tube-formation of human primary endothelial cells by targeting anti-angiogenic factor epsin2.
Scientific Reports 2017 July 18
Angiogenesis, new vessel formation from pre-existing vessels, is a highly conserved event through vertebrates. However, the system for tuning angiogenesis by species-intrinsic factors is totally unknown. miR-1224 is a member of mammal-specific mirtrons, which were identified as non-canonical microRNAs. We found that the expression of miR-1224 was upregulated in capillary-like tube-forming human umbilical vein endothelial cells on Matrigel. Enforced expression of miR-1224 stimulated tube formation, whereas repression of endogenous miR-1224 inhibited formation. Enforced expression of miR-1224 enhanced VEGF signaling and repressed NOTCH signaling. The adaptor protein of clathrin-dependent endocytosis, epsin2, which has been shown to be a suppressor of angiogenesis, was a direct target of miR-1224. Knockdown of EPN2 stimulated tube formation, while overexpression of EPN2 repressed miR-1224-mediated stimulation. Our findings indicate that miR-1224 is a mammal specific modulator of angiogenesis.
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