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Related Experiment Videos

Collagenolytic activity from isolated bone cells.

J E Puzas, J S Brand

    Biochimica Et Biophysica Acta
    |May 13, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Bone cells contain true collagenase (EC 3.4.24.3), an enzyme directly extractable in large quantities. These cells secrete collagenase in vitro, with levels shifting from intracellular to extracellular over time.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Bone Biology

    Background:

    • Collagenase, a key enzyme in extracellular matrix remodeling, was previously identified in bone culture fluids and whole bone extracts.
    • The precise cellular localization and characteristics of bone collagenase were not fully elucidated.

    Purpose of the Study:

    • To localize the true collagenase (EC 3.4.24.3) within the cellular component of bone.
    • To characterize the cellular collagenase and investigate its secretion by bone cells in vitro.

    Main Methods:

    • Enzyme extraction from cellular bone components.
    • Characterization of the extracted enzyme.
    • In vitro culture of bone cells to assess collagenase secretion over time.
    • Measurement of intracellular and extracellular collagenase levels.

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    Main Results:

    • True collagenase was localized to the cellular component of bone.
    • The cellular enzyme exhibited characteristics identical to previously described bone collagenases.
    • Significant quantities of collagenase were directly extractable from bone cells.
    • Bone cells were observed to secrete collagenase in vitro, with increasing extracellular and decreasing intracellular levels over incubation time.
    • No evidence of a bone cell procollagease was found.

    Conclusions:

    • Bone cells are the source of true collagenase.
    • The enzyme is directly accessible and secreted by bone cells.
    • Understanding collagenase localization and secretion is crucial for bone remodeling research.