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Polypeptide induction by recombinant human IFN-gamma.

J Weil, C J Epstein, L B Epstein

Natural Immunity and Cell Growth Regulation

|January 1, 1983

Summary

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Interferon-gamma (IFN-gamma) is primarily responsible for inducing unique cellular responses, distinguishing it from Interferon-alpha (IFN-alpha) and Interferon-beta (IFN-beta). While other interferons can induce some of these responses at very high doses, IFN-gamma

Area of Science:

Immunology
Molecular Biology
Cellular Biology

Background:

Natural human Interferon-gamma (IFN-gamma) induces unique polypeptides distinct from those induced by Interferon-alpha (IFN-alpha) and Interferon-beta (IFN-beta).
A common set of polypeptides is induced by all three types of interferons.

Purpose of the Study:

To determine if purified recombinant IFN-gamma is the sole molecular species responsible for inducing unique polypeptides.
To investigate the role of IFN-gamma in differential polypeptide induction compared to IFN-alpha and IFN-beta.

Main Methods:

Utilized pure recombinant human IFN-gamma.
Employed a monoclonal antibody against IFN-gamma for neutralization studies.
Analyzed polypeptide induction patterns across different interferon types.

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Main Results:

Recombinant IFN-gamma was confirmed as the primary inducer of all polypeptides, including those uniquely associated with it.
IFN-alpha and IFN-beta showed limited induction of these unique polypeptides only at very high concentrations.
The differential effects of IFN-gamma versus IFN-alpha/beta were largely quantitative, not strictly qualitative.

Conclusions:

IFN-gamma is the principal molecular entity responsible for its characteristic polypeptide induction profile.
The observed differences between IFN-gamma and other interferons are mainly dose-dependent.
This clarifies the specific role of IFN-gamma in interferon-mediated cellular responses.