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Cytokine inhibition of DNA synthesis: effect on cyclic adenosine monophosphate in lymphocytes

B V Jegasothy, A R Pachner, B H Waksman

    Science (New York, N.Y.)
    |September 24, 1976
    PubMed

    Insights

    Elevated intracellular cyclic AMP levels significantly inhibit DNA synthesis in rat lymphocytes. This inhibition is closely linked to the timing of DNA synthesis initiation in these cells.

    Area of Science:

    • Cellular biology
    • Molecular biology
    • Immunology

    Background:

    • DNA synthesis is a critical process in cell proliferation.
    • Adenosine 3',5'-monophosphate (cyclic AMP) is a key intracellular second messenger.
    • Regulation of DNA synthesis is crucial for understanding cell cycle control.

    Purpose of the Study:

    • To investigate the effect of increased intracellular cyclic AMP on DNA synthesis in stimulated rat lymphocytes.
    • To determine the relationship between cyclic AMP levels and the initiation of DNA synthesis.

    Main Methods:

    • Stimulation of rat lymphocytes.
    • Measurement of intracellular adenosine 3',5'-monophosphate (cyclic AMP) levels.
    • Assessment of DNA synthesis.
    • Administration of a purified inhibitor of DNA synthesis.

    Main Results:

    • A greater than twofold increase in intracellular cyclic AMP inhibited DNA synthesis.
    • A two- to fourfold rise in cyclic AMP, starting at 16 hours, was observed.
    • This rise in cyclic AMP occurred in close association with the initiation of DNA synthesis, whether the inhibitor was added at 0 or 16 hours.

    Conclusions:

    • Increased intracellular cyclic AMP acts as an inhibitor of DNA synthesis in stimulated rat lymphocytes.
    • The timing of cyclic AMP elevation correlates with the initiation phase of DNA synthesis, suggesting a regulatory role.
    • These findings contribute to understanding the molecular mechanisms controlling lymphocyte proliferation.

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