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Related Experiment Videos

A role for sulfhydryl groups in granulocyte aggregation.

E H Kraut, A L Sagone

    Blood
    |May 1, 1984
    PubMed
    Summary

    Cellular sulfhydryls are crucial for polymorphonuclear leukocyte (PMN) aggregation. Oxidizing these sulfhydryls enhances C5A-induced PMN aggregation, while blocking them impairs it, highlighting their role in immune cell function.

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    Area of Science:

    • Immunology
    • Cell Biology
    • Biochemistry

    Background:

    • Polymorphonuclear leukocytes (PMN) aggregate in response to complement component C5A.
    • PMN aggregation is influenced by alterations in the plasma membrane and cytoskeleton.
    • Sulfhydryl groups are vital components of the PMN plasma membrane and cytoskeleton.

    Purpose of the Study:

    • To investigate the role of sulfhydryls in C5A-induced PMN aggregation.
    • To determine the effect of sulfhydryl oxidation and binding agents on PMN aggregation.

    Main Methods:

    • Incubation of PMN with sulfhydryl-oxidizing agents (diamide, tertiary butyl hydroperoxide).
    • Treatment of PMN with sulfhydryl-binding agents (N-ethylmaleimide, P-chloromercuriphenyl sulfonic acid).
    • Assessment of PMN aggregation response and [14C]-L-glucose oxidation.

    Main Results:

    • Diamide enhanced C5A-induced PMN aggregation, while tertiary butyl hydroperoxide had no effect.
    • N-ethylmaleimide significantly impaired PMN aggregation without affecting glucose oxidation.
    • P-chloromercuriphenyl sulfonic acid did not affect PMN aggregation.

    Conclusions:

    • Cellular sulfhydryls are essential for optimal PMN aggregation.
    • Oxidation of non-glutathione (GSH) sulfhydryls contributes to C5A-induced PMN aggregation.
    • Sulfhydryl modification is a key biochemical event in PMN aggregation.

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