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Related Experiment Videos

Hydrogen peroxide release from human blood platelets

A Finazzi-Agrò, A Menichelli, M Persiani

    Biochimica Et Biophysica Acta
    |September 17, 1982
    PubMed
    Summary

    Human blood platelets release hydrogen peroxide upon stimulation with particles. This release, measured by fluorescence, indicates platelet activation and inflammatory responses.

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    Area of Science:

    • Hematology
    • Biochemistry
    • Immunology

    Background:

    • Human blood platelets play a role in immune responses.
    • Platelet activation can lead to the release of reactive oxygen species.

    Purpose of the Study:

    • To quantify hydrogen peroxide release from human platelets stimulated by particulate agents.
    • To investigate the mechanism of hydrogen peroxide production in activated platelets.

    Main Methods:

    • Fluorescence assay using scopoletin to detect hydrogen peroxide release.
    • Measurement of oxygen uptake in the presence and absence of catalase and potassium cyanide.

    Main Results:

    • Stimulated platelets released significantly more hydrogen peroxide (6.11 nmol/10(9) platelets/20 min) compared to unstimulated platelets.
    • Hydrogen peroxide release was dependent on NADH and cyanide-insensitive.
    • Resting platelets produced 6.0 nmol/10(9) platelets/20 min, while stimulated platelets produced 15 nmol/10(9) platelets/20 min.

    Conclusions:

    • Particulate agents stimulate human platelets to release hydrogen peroxide.
    • NADH-dependent, cyanide-insensitive pathways contribute to peroxide production in activated platelets.

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