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J. Biol. Chem., Vol. 277, Issue 37, 33545-33558, September 13, 2002
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Family Type I
Receptors and Smad Proteins in the Hypertrophic Maturation and
Osteoblastic Differentiation of Chondrocytes*
§,
,
, and
From the We investigated the effects of bone morphogenetic
protein (BMP)-2, a member of the transforming growth factor-
Institut de Biologie et Chimie des
Protéines, UMR 5086 CNRS/Université Claude Bernard Lyon
1, 7 passage du Vercors, 69367 Lyon Cedex 07, France and the
¶ Ludwig Institute for Cancer Research, Box 595, SE-751 24 Uppsala, Sweden
superfamily, on the regulation of the chondrocyte phenotype, and we
identified signaling molecules involved in this regulation. BMP-2
triggers three concomitant responses in mouse primary chondrocytes and chondrocytic MC615 cells. First, BMP-2 stimulates expression or synthesis of type II collagen. Second, BMP-2 induces expression of
molecular markers characteristic of pre- and hypertrophic chondrocytes, such as Indian hedgehog, parathyroid hormone/parathyroid
hormone-related peptide receptor, type X collagen, and alkaline
phosphatase. Third, BMP-2 induces osteocalcin expression, a
specific trait of osteoblasts. Constitutively active forms of
transforming growth factor-
family type I receptors and Smad
proteins were overexpressed to address their role in this process.
Activin receptor-like kinase (ALK)-1, ALK-2, ALK-3, and ALK-6 were able
to reproduce the hypertrophic maturation of chondrocytes induced by
BMP-2. In addition, ALK-2 mimicked further the osteoblastic
differentiation of chondrocytes induced by BMP-2. In the presence of
BMP-2, Smad1, Smad5, and Smad8 potentiated the hypertrophic maturation
of chondrocytes, but failed to induce osteocalcin
expression. Smad6 and Smad7 impaired chondrocytic expression and
osteoblastic differentiation induced by BMP-2. Thus, our results
indicate that Smad-mediated pathways are essential for the regulation
of the different steps of chondrocyte and osteoblast
differentiation and suggest that additional Smad-independent pathways
might be activated by ALK-2.
To whom correspondence and reprint requests should be
addressed: Institut de Biologie et Chimie des Protéines, UMR 5086 CNRS/Université Claude Bernard Lyon 1, 7 passage du Vercors,
69367 Lyon Cedex 07, France. Tel.: 33-4-72-72-26-19; Fax:
33-4-72-72-26-04; E-mail: f.mallein-gerin@ibcp.fr.
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