Abstract
Bone morphogenetic proteins (BMPs) play an essential role in cell fate determination. In this study, we found that BMP2 treatment resulted in growth arrest and differentiation in human neuroblastoma-derived cell lines, SH-SY5Y and RTBM1. Within 30 min of BMP2 exposure, phosphorylation of Smad1/5 was observed in these cell lines. In RTBM1 cells, BMP2-induced differentiation was accompanied by a significant decrease in the expression level of DAN, an antagonist of BMP in frog embryos. Immunoblot analysis revealed that BMP2 treatment caused a down-regulation of p53 family members and hence of cyclin-dependent kinase inhibitor p21 WAF1. We found a significant accumulation of p27 KIP1 in response to BMP2, whereas the expression level of Skp2, which is required for ubiquitin-dependent p27 KIP1 degradation, was decreased during this differentiation process. Our results suggest that p27 KIP1 contributes to the BMP-induced growth arrest and neuronal differentiation of neuroblastoma, and BMP treatment might provide a new therapeutic strategy.
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