期刊
CONNECTIVE TISSUE RESEARCH
卷 43, 期 2-3, 页码 354-358出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/03008200290000565
关键词
TGF beta-1; dentin sialophosphoprotein; dentin matrix protein 1; ALK5; TGFBR1; Smads
资金
- NIDCR NIH HHS [P01 DE13221, F30 DE14326, R01 DE11681] Funding Source: Medline
Transforming growth factor beta-1 (TGFbeta-1) is a multifunctional growth factor that is expressed in numerous cell types. It has been shown to induce secretion of dentin extracellular matrix components associated with primary dentinogenesis and to play a role in tertiary or reparative dentinogenesis. In this study, we investigated the potential transcriptional regulation by TGFbeta-1 of two dentin matrix proteins: dentin matrix protein 1 (DMP-1), and dentin sialophosphoprotein (DSPP). In vitro promoter studies were performed using plasmid constructs containing mouse DMP-1 and DSPP promoter sequences fused to the luciferase reporter gene. Constructs were transiently transfected in the mouse odontoblast cell line M06-G3 and cultured in the presence or absence of TGFbeta-1. The integrity of the TGFbeta-1 signaling pathway was investigated in the M06-G3 cells by identifying known key effectors of TGFbeta-1 signal transduction. Transient transfection studies demonstrate for the first time that TGFbeta-1 downregulates both DMP-1 and DSPP genes. Our findings indicate that the TGFbeta-1 type I receptor ALK5 is expressed by odontoblasts as well as the signal transduction proteins Smad2, Smad3, and Smad4. These results suggest that TGFbeta-1 regulates two key dentin proteins involved in matrix mineralization most likely mediated through the type I ALK5 receptor and transduced by Smads 2, 3, and 4.
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