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Priming of interferon action.

W R Fleischmann

    Texas Reports on Biology and Medicine
    |January 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Pre-exposing L cell cultures to low-dose mouse interferon primes them for enhanced protection against higher doses. This interferon priming effect requires cellular RNA synthesis and is specific to interferon type.

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    Area of Science:

    • Immunology
    • Cell Biology
    • Virology

    Background:

    • Interferons (IFNs) are crucial cytokines involved in innate immunity against viral infections.
    • Cellular responses to IFNs can be modulated by prior exposure to lower levels of these proteins.
    • Understanding IFN priming mechanisms is vital for developing antiviral strategies.

    Purpose of the Study:

    • To investigate the phenomenon of interferon (IFN) priming in L cell cultures.
    • To determine the specificity and requirements of IFN-induced priming.
    • To correlate the priming efficacy with the antiviral potency of different types of IFNs.

    Main Methods:

    • L cell cultures were pretreated with low concentrations of mouse interferon.
    • Subsequent exposure to higher interferon concentrations was performed.

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  • Cellular RNA synthesis inhibition was assessed.
  • Plaque reduction assays were used to quantify antiviral protection and interferon titers.

    • Main Results:

    • Pretreatment with low-level mouse interferon significantly enhanced protection against subsequent high-level interferon challenge compared to controls.
    • The priming effect was dependent on cellular RNA synthesis, indicating an active biological process.
    • Priming efficacy correlated directly with the plaque reduction titer of mouse fibroblast interferon, mouse immune interferon, and human leukocyte interferon.

    Conclusions:

    • Low-level interferon pretreatment confers a state of enhanced cellular resistance to subsequent interferon exposure.
    • Interferon priming is a specific, RNA-synthesis-dependent cellular response.
    • The antiviral efficacy of priming is directly related to the specific interferon's potency in L cells.