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Myostatin (GDF-8) inhibits chondrogenesis and chondrocyte proliferation in vitro by suppressing Sox-9 expression

Growth Factors , Volume 29 (6) – Dec 1, 2011

Details

Publisher
Informa Health
Copyright
© 2011 Informa UK, Ltd.
Subject
Articles
ISSN
0897-7194
eISSN
1029-2292
D.O.I.
10.3109/08977194.2011.599324
Publisher site
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Myostatin (GDF-8) inhibits chondrogenesis and chondrocyte proliferation in vitro by suppressing Sox-9 expression

Abstract

Here, we investigate a possible direct role for myostatin in chondrogenesis. First, we examined the effects of myostatin on the proliferation of bone marrow stromal cells (BMSCs) and epiphyseal growth plate (EGP) chondrocytes (EGPCs) isolated from myostatin-deficient mice. Results show that myostatin deficiency is associated with a significant ( P < 0.001) increase in proliferation of both BMSCs (++25%) and EGPCs (++35%) compared with wild-type cells. Next, we examined the effects of myostatin treatment on chondrogenic differentiation of BMSCs. These experiments show that myostatin treatment starting at either 0 or 48 h induces a significant decrease in collagen type II protein synthesis by 31% ( P < 0.001) and 25% ( P < 0.05), respectively. Real-time PCR reveals significant ( P < 0.01) down regulation of Sox9 mRNA expression with 10 and 100 ng/ml treatments. Together, these findings suggest that myostatin has direct effects on chondrogenesis, and may, therefore, represent a potential therapeutic target for improving bone repair.
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