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The radiosensitivity of rat thymocytes.

M G Ord, L A Stocken

    The Biochemical Journal
    |September 1, 1986
    PubMed
    Summary

    Gamma irradiation inhibits superoxide production in rat thymocytes by blocking NADPH oxidase. This radiosensitivity in small lymphocytes is linked to reduced NADPH levels, potentially explaining radiation-induced cell death.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Radiation Biology

    Background:

    • Plasma membrane-associated NADPH oxidase produces superoxide in thymocytes.
    • Ionizing radiation can induce cell death in lymphocytes.

    Purpose of the Study:

    • To investigate the effect of gamma irradiation on NADPH oxidase activity in rat thymocytes.
    • To identify the radiosensitive cell population and the metabolic basis for radiation-induced lymphocyte death.

    Main Methods:

    • In vitro gamma irradiation of rat thymocytes.
    • Differential centrifugation to isolate cell components.
    • Biochemical assays to measure NADPH oxidase activity and NADPH levels.

    Main Results:

    • Gamma irradiation inhibited plasma membrane-associated NADPH oxidase activity.
    • Smaller lymphocytes (approx. 6 microns) were identified as the radiosensitive population.
    • Irradiation reduced endogenous NADPH levels, mimicking the effect of GSSG with GSSG reductase inhibition.

    Conclusions:

    • The inhibition of NADPH oxidase and subsequent reduction in NADPH levels by gamma irradiation may be the metabolic basis for interphase death in small lymphocytes.
    • The study highlights the role of NADPH oxidase in lymphocyte radiosensitivity.

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