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The effect of interferon-gamma on genetic immunization
Vaccine
|June 1, 1997
Summary
Mouse interferon-gamma (IFN-gamma) affects immune responses to viral antigens. Its impact depends on the promoter used, reducing responses with viral or MHC class I promoters but not MHC class II promoters.
Area of Science:
- Immunology
- Virology
- Molecular Biology
Background:
- Interferon-gamma (IFN-gamma) is a key cytokine in immune regulation.
- Gene expression is controlled by various promoters, influencing protein production and immune responses.
Purpose of the Study:
- To investigate the impact of co-administered mouse interferon-gamma (IFN-gamma) on antigen-specific B and T helper cell responses.
- To determine if the effect of IFN-gamma on immune responses is influenced by the promoter driving viral antigen expression.
Main Methods:
- Mice were intramuscularly inoculated with plasmid vectors expressing rabies virus glycoprotein.
- An additional vector encoded mouse IFN-gamma.
- Immune responses were analyzed based on the promoter (SV40 early, MHC class I, or MHC class II) driving viral antigen expression.
Main Results:
- IFN-gamma reduced immune responses when viral antigen expression was driven by the SV40 early promoter or MHC class I promoter.
- IFN-gamma did not affect B and T helper cell responses when viral antigen expression was under the control of the MHC class II promoter.
Conclusions:
- The effect of IFN-gamma on cellular immune responses is promoter-dependent.
- MHC class II promoters may offer a way to elicit immune responses independent of IFN-gamma-mediated suppression.