Interaction of periosteal explants with articular chondrocytes alters expression profile of matrix metalloproteinases

Authors

  • Matthias Rickert,

    1. Department of Orthopaedic Surgery, Experimental Orthopaedics, University Hospital of Regensburg, 93077 Bad Abbach, Germany
    2. Center for Medical Biotechnology, BioPark I, University Hospital of Regensburg, 93053 Regensburg, Germany
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  • Rita Dreier,

    1. Institute for Physiological Chemistry and Pathobiochemistry, University Hospital of Münster, 48149 Münster, Germany
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  • Jürgen Radons,

    1. Institute of Medical Biochemistry and Molecular Biology, University of Greifswald, Clinical Center, 17489 Greifswald, Germany
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  • Alfred Opolka,

    1. Department of Orthopaedic Surgery, Experimental Orthopaedics, University Hospital of Regensburg, 93077 Bad Abbach, Germany
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  • Joachim Grifka,

    1. Department of Orthopaedic Surgery, Experimental Orthopaedics, University Hospital of Regensburg, 93077 Bad Abbach, Germany
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  • Sven Anders,

    1. Department of Orthopaedic Surgery, Experimental Orthopaedics, University Hospital of Regensburg, 93077 Bad Abbach, Germany
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  • Susanne Grässel

    Corresponding author
    1. Department of Orthopaedic Surgery, Experimental Orthopaedics, University Hospital of Regensburg, 93077 Bad Abbach, Germany
    2. Center for Medical Biotechnology, BioPark I, University Hospital of Regensburg, 93053 Regensburg, Germany
    • Department of Orthopaedic Surgery, Experimental Orthopaedics, University Hospital of Regensburg, 93077 Bad Abbach, Germany. T: ++49-941-943-5065; F: ++49-941-943-5066
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  • Sven Anders and Susanne Grässel contributed equally to this work.

Abstract

Periosteal tissue is a source of growth factors and of osteochondral progenitor cells which makes it suitable for implantation in chondral defects as known in autologous chondrocyte implantation. The aim of this study was to determine the interaction between periosteal tissue and articular chondrocytes with respect to catabolic effectors such as matrix metalloproteinases (MMPs) and IL-6. Human articular chondrocytes were cultured for up to 28 days as micromass pellets in coculture either with physical contact to periosteal explants or allowing paracrine interactions only. Expression, secretion, and activation of MMPs and IL-6 were analyzed in chondrocytes, periosteum, and culture supernatants. Both coculture conditions influence gene expression levels of MMPs and IL-6 in a time-, culture-, and tissue-dependent manner. Coculturing of periosteum with chondrocytes promotes gene expression and secretion of IL-6. In periosteum, physical contact inhibits MMP-2 and MMP-13 gene expression while paracrine coculture induces expression of IL-6, MMP-2, -7, and -13. Pro-MMP-2, -7, and -13 were detected in supernatants of all culture regimens whereas pro-MMP-9 was secreted from periosteum only. As a balanced amount of MMP activity is likely required to achieve sufficient integration of the regenerate tissue with the surrounding healthy cartilage, an exceeding expression of proteinases might result in degradation, hypertrophy or rejection of the graft. © 2010 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 28:1576–1585, 2010

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