TGF-beta signaling by Smad proteins
- PMID: 10708949
- DOI: 10.1016/s1359-6101(99)00025-8
TGF-beta signaling by Smad proteins
Abstract
Smads are signal transducers for the members of the transforming growth factor-beta (TGF-beta) superfamily. Bone morphogenetic proteins (BMPs) and their receptors induce differentiation of C2C12 cells into osteoblast-like cells. Using an adenoviral expression vector system, we showed that receptor-regulated Smads (R-Smads) activated by BMPs can induce the differentiation of C2C12 cells. Inhibitory Smads (I-Smads) interfere with the osteoblast differentiation of C2C12 cells by preventing the nuclear translocation of R-Smads. After translocation into the nucleus, Smad oligomers regulate the transcription of target genes through binding to DNA directly, interaction with other DNA binding proteins, and recruitment of transcriptional co-activators or co-repressors. Through interaction with different transcription factors and transcriptional co-activators or co-repressors, Smads may exhibit specific effects in various cell types.
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