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Growth inhibitory effect of gene-cloned interferons on human myeloblast colonies

M H Freedman, E Fish, Z Estrov

    Experimental Hematology
    |October 1, 1985
    PubMed

    Insights

    Three types of human leukocyte interferons (IFN) show anti-leukemic properties by suppressing myeloblast colony formation in acute myeloid leukemia patients. Interferon-alpha-C demonstrated a more pronounced effect on primary growth, while Interferon-alpha-A maintained antiproliferative effects on secondary growth.

    Area of Science:

    • Hematology
    • Oncology
    • Immunology

    Background:

    • Acute myeloid leukemia (AML) is a hematologic malignancy characterized by uncontrolled proliferation of myeloid blasts.
    • Interferons (IFNs) are cytokines with known immunomodulatory and antiproliferative effects.
    • Recombinant DNA technology has enabled the production of specific interferon subtypes for therapeutic research.

    Purpose of the Study:

    • To investigate the in vitro effects of three recombinant human leukocyte interferon subtypes (IFN alpha 2, IFN alpha-A, IFN alpha-C) on acute myeloid leukemia (AML) myeloblast colony formation.
    • To assess the dose-dependent response and self-renewal capacity of AML cells exposed to these interferons.
    • To compare the differential anti-leukemic properties of IFN alpha-A and IFN alpha-C.

    Main Methods:

    • Leukemic bone marrow cells from nine AML patients were cultured in the presence of varying concentrations (10^2-10^5 U/ml) of IFN alpha 2, IFN alpha-A, and IFN alpha-C.
    • Myeloblast colony formation was assessed.
    • Self-renewal assays were performed on primary cultures to evaluate secondary colony growth.
    • Expression of the IFN-induced enzyme 2-5A synthetase was measured to confirm cellular response.

    Main Results:

    • All three tested interferon subtypes exhibited a dose-dependent suppression of myeloblast colony formation in vitro.
    • A significant increase in 2-5A synthetase indicated that AML cells possess functional interferon receptors and metabolic responsiveness.
    • Interferon-alpha-C showed a more potent suppression of primary myeloblast growth compared to IFN alpha-A at concentrations of 10^3 U/ml and higher.
    • While IFN alpha-C's effect on secondary growth was transient, IFN alpha-A demonstrated a persistent antiproliferative effect on self-renewal.

    Conclusions:

    • Gene-cloned interferon subtypes possess significant in vitro antileukemic properties against acute myeloid leukemia.
    • Differential effects were observed among IFN subtypes regarding the suppression of primary myeloblast proliferation and the inhibition of cancer cell self-renewal.
    • These findings suggest potential for targeted interferon-based therapies in AML, with specific subtypes offering distinct advantages.

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