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  • Title: Differential regulation of osteoadherin (OSAD) by TGF-beta1 and BMP-2.
    Author: Rehn AP, Chalk AM, Wendel M.
    Journal: Biochem Biophys Res Commun; 2006 Oct 27; 349(3):1057-64. PubMed ID: 16970923.
    Abstract:
    Osteoadherin (OSAD) is a member of the small leucine rich-repeat proteoglycan (SLRP) family. SLRPs are normally found in extracellular matrices, but OSAD is the only member restricted to mineralized tissues. We investigated the promoter region of OSAD by in silico analysis and found that the proximal promoter region contains sites for Smad-3, Smad-4, and AP-1. All are effectors of TGF-beta family signalling. We tested sensitivity of the promoter to the two TGF-beta family members TGF-beta1 and BMP-2. We found TGF-beta1 to down regulate OSAD, while BMP-2 up regulates OSAD. As a consequence of how OSAD is regulated by TGF-beta1 and BMP-2 and its temporal expression pattern in osteoblasts and bone development, we can conclude OSAD as an early marker for terminally differentiated matrix producing osteoblasts.
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