| First Author | Wong MM | Year | 2013 |
| Journal | Arterioscler Thromb Vasc Biol | Volume | 33 |
| Issue | 10 | Pages | 2397-406 |
| PubMed ID | 23928863 | Mgi Jnum | J:222225 |
| Mgi Id | MGI:5644142 | Doi | 10.1161/ATVBAHA.113.301595 |
| Citation | Wong MM, et al. (2013) Sirolimus stimulates vascular stem/progenitor cell migration and differentiation into smooth muscle cells via epidermal growth factor receptor/extracellular signal-regulated kinase/beta-catenin signaling pathway. Arterioscler Thromb Vasc Biol 33(10):2397-406 |
| abstractText | OBJECTIVE: Sirolimus-eluting stent therapy has achieved considerable success in overcoming coronary artery restenosis. However, there remain a large number of patients presenting with restenosis after the treatment, and the source of its persistence remains unclarified. Although recent evidence supports the contribution of vascular stem/progenitor cells in restenosis formation, their functional and molecular responses to sirolimus are largely unknown. APPROACH AND RESULTS: Using an established technique, vascular progenitor cells were isolated from adventitial tissues of mouse vessel grafts and purified with microbeads specific for stem cell antigen-1. We provide evidence that vascular progenitor cells treated with sirolimus resulted in an induction of their migration in both transwell and wound healing models, clearly mediated by CXCR4 activation. We confirmed the sirolimus-mediated increase of migration from the adventitial into the intima side using an ex vivo decellularized vessel scaffold, where they form neointima-like lesions that expressed high levels of smooth muscle cell (SMC) markers (SM-22alpha and calponin). Subsequent in vitro studies confirmed that sirolimus can induce SMC but not endothelial cell differentiation of progenitor cells. Mechanistically, we showed that sirolimus-induced progenitor-SMC differentiation was mediated via epidermal growth factor receptor and extracellular signal-regulated kinase 1/2 activation that lead to beta-catenin nuclear translocation. The ablation of epidermal growth factor receptor, extracellular signal-regulated kinase 1/2, or beta-catenin attenuated sirolimus-induced SM-22alpha promoter activation and SMC differentiation. CONCLUSIONS: These findings provide direct evidence of sirolimus-induced progenitor cell migration and differentiation into SMC via CXCR4 and epidermal growth factor receptor/extracellular signal-regulated kinase/beta-catenin signal pathways, thus implicating a novel mechanism of restenosis formation after sirolimus-eluting stent treatment. |
