Abe Y, Abe T, Aida Y, Hara Y, Maeda K. Follistatin restricts bone morphogenetic protein (BMP)-2 action on the differentiation of osteoblasts in fetal rat mandibular cells.
J Bone Miner Res 2004;
19:1302-7. [PMID:
15231018 DOI:
10.1359/jbmr.040408]
[Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2003] [Revised: 11/26/2003] [Accepted: 04/30/2004] [Indexed: 11/18/2022]
Abstract
UNLABELLED
We tested whether FS secretion might modulate BMP-2 actions by measuring FS levels and counting bone numbers of rat mandibular cells. In the presence of Dex, BMP-2 stimulated FS secretion at the early phase and augmented bone nodule by neutralizing with FS antibody. We concluded that BMP-2 facilitates FS secretion, and the FS restricts BMP-2 action on osteoblastogenesis.
INTRODUCTION
Bone morphogenetic proteins (BMPs) promote the differentiation of osteoprogenitor cells into osteoblasts. Activin A is involved in the regulation of bone formation. Follistatin (FS) antagonizes the bioactivities of BMP and activin A extracellularly.
MATERIALS AND METHODS
In this study, we tested whether the induction of FS secretion might modulate the effects of BMP-2 on osteoblast development, using the bone nodule-forming cultures of fetal rat mandibular cells.
RESULTS AND CONCLUSIONS
In the presence of dexamethasone (Dex), BMP-2 stimulated the secretion of FS at the early phase (days 3-9) of the culture. Dex alone had no effect, and BMP-2 alone was less effective than the combination of the two. BMP-4 and -6 had little effect on FS secretion. Activin A inhibited the early upregulation of FS secretion when added with BMP-2 and Dex. In the presence of Dex, BMP-2 increased bone nodule numbers when added to early cultures. The addition of anti-FS antibody to cultures with BMP-2 and Dex augmented bone nodule formation. These results show that BMP-2 facilitates the secretion of FS in the presence of Dex, and the increased FS secretion restricts the action of BMP-2 on osteoblast differentiation.
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