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Synergistic antiproliferative effect of human interferons in combination with mismatched double-stranded RNA on human

H R Hubbell

    International Journal of Cancer
    |March 15, 1986
    PubMed

    Insights

    Ampligen, a novel dsRNA, demonstrated synergistic antiproliferative effects when combined with interferons (IFNs) across various human tumor cell lines. This combination therapy enhanced IFN efficacy, even in cells resistant to IFNs alone, suggesting Ampligen may have additional mechanisms of action.

    Area of Science:

    • Oncology
    • Virology
    • Immunology

    Background:

    • Interferons (IFNs) are crucial in cancer therapy.
    • Ampligen (r(I)n r(C12,U)n) is a novel mismatched dsRNA with potential antiproliferative properties.
    • Tumor cell line responses to IFNs and Ampligen vary.

    Purpose of the Study:

    • To investigate the combined antiproliferative effects of IFNs and Ampligen on human tumor cell lines.
    • To determine if Ampligen can potentiate the efficacy of IFNs, particularly in IFN-resistant cells.
    • To explore potential mechanisms of action for Ampligen in combination therapy.

    Main Methods:

    • Testing antiproliferative effects of IFNs and Ampligen alone and in combination on four human tumor cell lines (RT4, A2182, HT 1080 C14, RT112).
    • Dose-response studies and analysis of variance were used to compare natural and recombinant IFNs.
    • Synergistic effects were quantified using the isobole method (Berenbaum, 1981).

    Main Results:

    • Ampligen showed dose-dependent inhibition in three of four cell lines, while RT4 cells were resistant.
    • IFNs were effective against RT4, HT1080 C14, and RT112 cells but not A2182 cells.
    • A significant synergistic antiproliferative effect was observed with all IFN-Ampligen combinations.
    • Ampligen potentiated IFN effects by 3.3- to over 250-fold, enhancing efficacy in IFN-resistant cells.
    • Natural IFNs were generally more effective than recombinant IFNs.

    Conclusions:

    • Ampligen synergizes with all tested IFNs across all cell lines.
    • Ampligen can potentiate IFN-mediated growth inhibition in cells resistant to IFNs.
    • Ampligen may exert its effects through mechanisms beyond IFN induction.
    • Combination therapy with Ampligen and IFNs holds promise for cancer treatment.

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