Autoregulation of glypican-1 by intronic microRNA-149 fine-tunes the angiogenic response to fibroblast growth factor in human endothelial cells

Abstract

MiR-149 is located within the first intron of glypican-1 (GPC1) gene. GPC1 is low affinity receptor for fibroblast growth factor (FGF2) that favors FGF2- binding to its receptor (FGFR1), subsequently promoting FGF2-FGFR1 activation and signaling. Using bioinformatic approaches, both GPC1 and FGFR1 were identified and subsequently validated as targets for miR-149 (both mature and passenger strands) in endothelial cells (ECs). ?As a consequence of their targeting activity towards GPC1 and FGFR1, both miR-149 and miR-149* regulated FGF2 signaling and FGF2-induced responses in ECs, namely proliferation, migration and cord formation. Moreover, lentiviral overexpression of miR-149 reduced in vivo tumor-induced neovascularization. Importantly, FGF2 transcriptionally stimulated the expression of miR-149 independently of its host gene, therefore assuring the steady state of FGF2-induced responses through the regulation of the GPC1-FGFR1 binary complex in ECs.