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Related Experiment Videos

Rabies superantigen as a Vbeta T-dependent adjuvant

E Astoul1, M Lafage, M Lafon

  • 1Unité de Neurovirologie et Régénération du Systemè Nerveux, Institut Pasteur, Paris, France.

The Journal of Experimental Medicine
|April 1, 1996
PubMed
Summary

Rabies virus nucleocapsid (NC) acts as a superantigen (SAg), enhancing immune responses to unrelated antigens like influenza. This adjuvant effect depends on specific T cell receptor expression, linking NC’s SAg properties to its immune-stimulating capabilities.

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Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • Rabies virus nucleocapsid (NC) functions as a Vbeta8-specific superantigen (SAg) in humans and Vbeta6-specific in BALB/c mice.
  • NC enhances rabies vaccination by boosting neutralizing antibody responses.
  • The study investigates if NC's adjuvant properties are linked to its SAg activity.

Purpose of the Study:

  • To test the hypothesis that rabies SAg's immune-stimulating effects are linked to its superantigen properties.
  • To determine if rabies SAg can enhance immune responses to an unrelated antigen, influenza virus.
  • To elucidate the role of T cell receptor (TCR) Vbeta6 expression in mediating these effects.

Main Methods:

  • Comparing immune responses to inactivated influenza virus in BALB/c (SAg-responsive) and BALB/D2 (SAg-non-responsive due to Vbeta6 TCR absence) mice.

Related Experiment Videos

  • Coinjecting rabies SAg with influenza virus and measuring antibody titers (IgG, IgM, hemagglutination-inhibiting), lymph node lymphocyte proliferation, and cytokine secretion (IL-2, IL-4).
  • Analyzing the Vbeta usage of influenza-primed T cells during the primary response.

    • Main Results:

    • In BALB/c mice, coinjection of rabies SAg with influenza virus significantly increased influenza-specific antibodies, lymphocyte proliferation, and IL-2/IL-4 secretion.
    • BALB/D2 mice showed no stimulation of antibody or lymphocyte responses to influenza when coinjected with rabies SAg.
    • The enhancement of influenza-specific T cells in BALB/c mice was primarily observed in those expressing Vbeta6 TCR.

    Conclusions:

    • Rabies SAg can stimulate both T and B cell responses to unrelated antigens, contingent upon the expression of the target Vbeta6 T cell receptor.
    • This study provides the first evidence linking the adjuvant properties of rabies nucleocapsid to its superantigen mechanism.
    • The findings highlight the potential of superantigens as immune modulators for unrelated antigens.