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Related Experiment Video

Updated: Jun 21, 2026

Detection of Protease Activity by Fluorescent Peptide Zymography
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Estimation of cell surface associated protease activity and its application to lymphocytes.

Z A Tökés

    Journal of Supramolecular Structure
    |January 1, 1976
    PubMed
    Summary
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    Researchers developed a novel method to measure cell surface proteolytic activity using specialized beads. Lymphocytes, particularly spleen cells, exhibit significant surface enzyme activity, altered by serum and temperature.

    Area of Science:

    • Biochemistry
    • Cell Biology
    • Immunology

    Background:

    • Proteolytic activity on cell surfaces plays a crucial role in biological processes.
    • Existing methods for measuring cell-associated proteolysis have limitations.

    Purpose of the Study:

    • To develop and validate a new method for quantifying cell surface proteolytic activity.
    • To investigate proteolytic activity in different lymphocyte populations.

    Main Methods:

    • Utilized radioiodinated protein substrates immobilized on polystyrene-divinylbenzene beads.
    • Assessed secreted and surface-associated proteolytic activity by measuring peptide release upon cell-bead interaction.
    • Applied the method to mouse spleen and lymph node lymphocytes, and rat T cells.

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    Main Results:

    • The new method successfully differentiated between secreted and surface-associated proteolytic activity.
    • Mouse spleen lymphocytes showed significantly higher surface proteolytic activity compared to lymph node cells in serum-free conditions.
    • Rat T cell populations exhibited a 30% increase in proteolysis upon contact with a casein substrate.

    Conclusions:

    • Lymphocytes possess significant, dynamically regulated cell surface proteolytic activity.
    • The developed bead-based assay is a valuable tool for studying cell surface enzyme function.
    • Further research is needed to fully elucidate the role of specific inhibitors on surface-associated proteolysis.