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Related Experiment Videos

Proteinases in connective tissue breakdown.

D J Etherington

    Ciba Foundation Symposium
    |January 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Lysosomal cathepsins B and N break down collagen within phagolysosomes. These enzymes target collagen

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Enzymology

    Background:

    • Collagen is a major extracellular matrix protein.
    • Its degradation is crucial for tissue remodeling and turnover.
    • Lysosomal enzymes play a role in intracellular protein breakdown.

    Purpose of the Study:

    • To investigate the role of lysosomal cathepsins B and N in collagen depolymerization.
    • To elucidate the mechanism of collagen breakdown by these enzymes.
    • To understand the regulation of collagen degradation in the phagolysosome and pericellular environment.

    Main Methods:

    • In vitro studies using native fibrillar collagen.
    • Enzyme activity assays at optimal pH (3.5) and temperature (37°C).
    • Analysis of collagen fragmentation and monomer denaturation.

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    Main Results:

    • Cathepsins B and N cleave native collagen at telopeptides, disrupting cross-links.
    • Optimal activity occurs at acidic pH (3.5).
    • Released collagen monomers denature spontaneously, facilitating further breakdown.

    Conclusions:

    • Lysosomal cathepsins B and N are key enzymes for completing collagen depolymerization intracellularly.
    • Acidic microenvironments can promote extracellular lysosomal enzyme activity.
    • Collagen degradation is a multi-step process involving various proteases and influenced by microenvironmental conditions.