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    Connective tissue growth factor (CTGF/CCN2) is a downstream mediator for TGF-beta1-induced extracellular matrix production in osteoblasts

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    Authors
    Arnott, John A.
    Nuglozeh, E.
    Rico, Mario C.
    Arango-Hisijara, Israel
    Odgren, Paul R.
    Safadi, Fayez F.
    Popoff, Steven N.
    UMass Chan Affiliations
    Department of Cell Biology
    Graduate School of Biomedical Sciences
    Document Type
    Journal Article
    Publication Date
    2006-11-30
    Keywords
    Animals; Cell Differentiation; Cell Proliferation; Cells, Cultured; Connective Tissue Growth Factor; Cyclins; Extracellular Matrix; Extracellular Matrix Proteins; Gene Expression Regulation; Immediate-Early Proteins; Intercellular Signaling Peptides and Proteins; Osteoblasts; RNA, Small Interfering; Rats; Transforming Growth Factor beta1
    Life Sciences
    Medicine and Health Sciences
    
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    Link to Full Text
    http://dx.doi.org/10.1002/jcp.20917
    Abstract
    Connective tissue growth factor (CTGF/CCN2) is a cysteine-rich, extracellular matrix (ECM) protein that acts as an anabolic growth factor to regulate osteoblast differentiation and function. Recent studies have identified CTGF as a downstream effector of transforming growth factor-beta1 (TGF-beta1) for certain functions in specific cell types. In this study, we examined the role of CTGF as a downstream mediator of TGF-beta1-induced ECM production and cell growth in osteoblasts. Using primary cultures, we demonstrated that TGF-beta1 is a potent inducer of CTGF expression in osteoblasts, and that this induction occurred at all stages of osteoblast differentiation from the proliferative through mineralization stages. TGF-beta1 treatment of osteoblasts increased the expression and synthesis of the ECM components, collagen and fibronectin. When CTGF-specific siRNA was used to prevent TGF-beta1 induction of CTGF expression, it also inhibited collagen and fibronectin production, thereby demonstrating the requirement of CTGF for their up-regulation. To examine the effects of TGF-beta1 on osteoblast cell growth, cultures were treated with TGF-beta1 during the proliferative stage. Cell number was significantly reduced and the cells exhibited a decrease in G1 cyclin expression, consistent with TGF-beta1-induced cell-cycle arrest. Cultures transfected with CTGF siRNA prior to TGF-beta1 treatment showed an even greater reduction in cell number, suggesting that TGF-beta1-induced growth arrest is independent of CTGF in osteoblasts. Collectively, these data demonstrate for the first time that CTGF is an essential downstream mediator for TGF-beta1-induced ECM production in osteoblasts, but these two growth factors function independently regarding their opposing effects on osteoblast proliferation.
    Source
    J Cell Physiol. 2007 Mar;210(3):843-52. Link to article on publisher's site
    DOI
    10.1002/jcp.20917
    Permanent Link to this Item
    http://hdl.handle.net/20.500.14038/32837
    PubMed ID
    17133352
    Related Resources
    Link to Article in PubMed
    ae974a485f413a2113503eed53cd6c53
    10.1002/jcp.20917
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    Morningside Graduate School of Biomedical Sciences Scholarly Publications

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