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Related Concept Videos

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Related Experiment Video

Updated: Jun 7, 2026

Fast and Specific Assessment of the Halogenating Peroxidase Activity in Leukocyte-enriched Blood Samples
05:17

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Published on: July 28, 2016

Superoxide dismutases in polymorphonuclear leukocytes.

M L Salin, J M McCord

    The Journal of Clinical Investigation
    |October 1, 1974
    PubMed
    Summary
    This summary is machine-generated.

    Human polymorphonuclear leukocytes contain two superoxide dismutases: a cyanide-sensitive cytosolic enzyme and a cyanide-resistant mitochondrial enzyme. Superoxide release during phagocytosis suggests cell surface and vacuole production.

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    Alternative Methods for the Detection of Superoxide Anion Generation in Platelets
    06:35

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    Published on: March 29, 2024

    Area of Science:

    • Biochemistry
    • Cell Biology
    • Immunology

    Background:

    • Polymorphonuclear leukocytes (PMNs) are crucial immune cells involved in pathogen defense.
    • Superoxide dismutase (SOD) enzymes are vital for neutralizing reactive oxygen species.
    • Previous studies reported conflicting findings regarding SOD isoenzymes in human PMNs.

    Purpose of the Study:

    • To investigate the presence and localization of superoxide dismutase isoenzymes in isolated human polymorphonuclear leukocytes.
    • To characterize the cyanide sensitivity and cellular location of these enzymes.
    • To explore the site of superoxide production during phagocytosis in PMNs.

    Main Methods:

    • Isolation of human polymorphonuclear leukocytes.
    • Electrophoretic analysis of superoxide dismutase activity.
    • Assessment of enzyme inhibition by cyanide.
    • Observation of superoxide release during phagocytosis.

    Main Results:

    • Two distinct superoxide dismutases were identified in human PMNs, electrophoretically identical to those in other human tissues.
    • A cyanide-sensitive superoxide dismutase was localized to the cytosol.
    • A cyanide-resistant superoxide dismutase was found in the mitochondria.
    • Significant superoxide release into the medium was observed during PMN phagocytosis.

    Conclusions:

    • Human polymorphonuclear leukocytes possess both a cytosolic, cyanide-sensitive SOD and a mitochondrial, cyanide-resistant SOD.
    • These findings contradict previous reports that failed to identify the cytoplasmic enzyme.
    • Superoxide production during phagocytosis likely occurs on the outer cell membrane surface and within the phagocytic vacuole, assuming a homogeneous cell population.