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Retinoic acid and steroids inhibit Epstein-Barr virus-induced nuclear antigen, DNA synthesis and lymphocyte

S K Sundar, P H Levine, D V Ablashi

    Anticancer Research
    |November 1, 1984
    PubMed

    Insights

    Continuous treatment with retinoic acid, dexamethasone, and prednisolone inhibits Epstein-Barr virus (EBV) transformation of B lymphocytes. Intermittent or delayed treatment allows EBV-induced nuclear antigen (EBNA) and DNA synthesis, enabling transformation.

    Area of Science:

    • Immunology
    • Virology
    • Cell Biology

    Background:

    • Epstein-Barr virus (EBV) infects human B lymphocytes, leading to transformation.
    • EBV-induced nuclear antigen (EBNA) and DNA synthesis are key events in B lymphocyte transformation.
    • Retinoic acid, dexamethasone, and prednisolone are known immunomodulatory agents.

    Purpose of the Study:

    • To investigate the effects of retinoic acid, dexamethasone, and prednisolone on EBV-induced B lymphocyte transformation.
    • To determine the impact of treatment timing and duration on EBV-mediated cellular events.

    Main Methods:

    • Human thymus-independent B lymphocytes were infected with EBV.
    • Cells were treated with retinoic acid, dexamethasone, or prednisolone under continuous, discontinuous, or delayed (8 days post-infection) conditions.
    • EBV-induced nuclear antigen (EBNA) expression, DNA synthesis, and cell transformation were assessed.

    Main Results:

    • Continuous treatment with these agents completely inhibited EBV-induced transformation.
    • Discontinuous treatment led to the recovery of DNA synthesis, EBNA expression, and transformation.
    • Treatment initiated 8 days after EBV infection had no inhibitory effect.

    Conclusions:

    • Continuous exposure to retinoic acid, dexamethasone, and prednisolone is crucial for inhibiting EBV-mediated B lymphocyte transformation.
    • These agents are ineffective once EBNA and EBV-induced DNA synthesis have been initiated.
    • The timing of intervention is critical for controlling EBV-induced cellular transformation.

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