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Supplementary Material for: MiR-17-3p Inhibits Angiogenesis by Downregulating Flk-1 in the Cell Growth Signal Pathway

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posted on 21.12.2012, 00:00 by Yin R., Wang R., Guo L., Zhang W., Lu Y.
MicroRNAs (miRs) are endogenously expressed small noncoding RNAs that regulate gene expression at the posttranscriptional level. Previous works indicated that the miR-17-92 cluster could regulate endothelial cell (EC) functions involved in angiogenesis. miR-17-3p, a component of the miR-17-92 cluster, could control the angiogenic activity of human umbilical vein ECs in a cell-autonomous manner in vitro. A 21-bp fragment from the Flk-1 3′-untranslated region containing miR-17-3p targeting sites was required for the rapid downregulation of Flk-1 expression by in silico and experimental analysis. Subsequently, the downstream cell growth pathway was inhibited by forced upregulation of miR-17-3p. Based on these data, we conclude that miR-17-3p is a negative regulator of the angiogenic phenotype of ECs through its ability to modulate the expression of Flk-1, which is implicated in the pleiotropic effects of miR-17-92 in angiogenesis.