| First Author | Lee A | Year | 2017 |
| Journal | Sci Rep | Volume | 7 |
| Issue | 1 | Pages | 2528 |
| PubMed ID | 28566713 | Mgi Jnum | J:275310 |
| Mgi Id | MGI:6296469 | Doi | 10.1038/s41598-017-02852-4 |
| Citation | Lee A, et al. (2017) A PPARgamma-dependent miR-424/503-CD40 axis regulates inflammation mediated angiogenesis. Sci Rep 7(1):2528 |
| abstractText | Activation of the endothelium by pro-inflammatory stimuli plays a key role in the pathogenesis of a multitude of vascular diseases. Angiogenesis is a crucial component of the vascular response associated with inflammatory signaling. The CD40/CD40 ligand dyad in endothelial cells (EC) has a central role in promoting vascular inflammatory response; however, the molecular mechanism underlying this component of inflammation and angiogenesis is not fully understood. Here we report a novel microRNA mediated suppression of endothelial CD40 expression. We found that CD40 is closely regulated by miR-424 and miR-503, which directly target its 3' untranslated region. Pro-inflammatory stimuli led to increased endothelial CD40 expression, at least in part due to decreased miR-424 and miR-503 expression. In addition, miR-424 and miR-503 reduced LPS induced EC sprouting, migration and tube formation. Moreover, we found that miR-424 and miR-503 expression is directly regulated by peroxisome proliferator-activated receptor gamma (PPARgamma), whose endothelial expression and activity are decreased in response to inflammatory factors. Finally, we demonstrate that mice with endothelial-specific deletion of miR-322 (miR-424 ortholog) and miR-503 have augmented angiogenic response to LPS in a Matrigel plug assay. Overall, these studies identify a PPARgamma-dependent miR-424/503-CD40 signaling axis that is critical for regulation of inflammation mediated angiogenesis. |
