Abstract:
:BMP-3b (also called GDF-10) is a novel BMP-3-related protein recently discovered in rat femur tissue. Gene expression of BMP-3b in osteoblastic cells and its regulation by prolonged culture, BMP-2 and transforming growth factor beta1 (TGF-beta1) were examined. The BMP-3b gene was highly expressed in rat osteoblasts obtained from calvarial bones but not in the osteoblastic cell lines (MC3T3-E1 and U2-OS). BMP-3b mRNA increased during osteoblastic differentiation in prolonged culture and was associated with increased alkaline phosphatase (ALPase) activity. When BMP-2, an enhancer of ALPase activity, was added to the primary osteoblast culture, BMP-3b mRNA increased 6.9-fold after 24 h. In contrast, TGF-beta1 treatment, which suppresses ALPase activity, rapidly and completely inhibited gene expression of BMP-3b. The regulation of BMP-3 mRNA differed from that of BMP-3b, even though both proteins share 81% identity. These findings indicate that BMP-3b gene expression is regulated by osteoblastic differentiation and BMP-3b functions in highly differentiated osteoblasts.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Hino J,Matsuo H,Kangawa Kdoi
10.1006/bbrc.1999.0341subject
Has Abstractpub_date
1999-03-16 00:00:00pages
419-24issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(99)90341-8journal_volume
256pub_type
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