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Cell shape and phenotypic expression in chondrocytes.

J Glowacki, E Trepman, J Folkman

    Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N.Y.)
    |January 1, 1983
    PubMed
    Summary
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    Cell shape significantly influences human chondrocyte phenotype. Rounded cells exhibit chondrocyte features, while flattened cells resemble fibroblasts, impacting proliferation and gene expression.

    Area of Science:

    • Cell Biology
    • Biochemistry
    • Tissue Engineering

    Background:

    • Chondrocytes are crucial for cartilage maintenance.
    • Understanding chondrocyte phenotype regulation is vital for regenerative medicine.
    • Factors influencing chondrocyte differentiation and function require elucidation.

    Purpose of the Study:

    • To investigate the role of cell shape in regulating human chondrocyte phenotype.
    • To determine how substrate adhesion influences chondrocyte morphology and function.

    Main Methods:

    • Human chondrocytes were cultured on poly(2-hydroxyethyl methacrylate) (poly[HEMA]) coated surfaces to control cell shape.
    • Cell morphology was assessed.
    • Proliferation rates were measured.
    • Incorporation of [3H]thymidine into DNA and 35SO4 into glycosaminoglycans was quantified.

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    Main Results:

    • Rounded chondrocytes exhibited typical chondrocyte morphology, slow proliferation, and high glycosaminoglycan synthesis.
    • Flattened chondrocytes displayed fibroblast-like morphology, rapid proliferation, and increased DNA synthesis.
    • Substratum adhesiveness, modulated by poly[HEMA], was used to control cell shape independently of other factors.

    Conclusions:

    • Cell shape is a critical determinant of human chondrocyte phenotypic expression.
    • Controlling cell shape offers a potential strategy for modulating chondrocyte behavior in vitro.
    • These findings have implications for cartilage tissue engineering and understanding chondrocyte biology.