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The Journal of Immunology, Vol 155, Issue 5 2525-2532, Copyright © 1995 by American Association of Immunologists
ARTICLES |
VE Schijns, BL Haagmans and MC Horzinek
Department of Infectious Diseases and Immunology, Veterinary Faculty, Ultrecht University, The Netherlands.
Cytokines can be used as adjuvants to enhance and direct protective immune responses induced by vaccines. IL-12, a cytokine that favors the maturation of Th1-type cells and stimulates associated cell-mediated responses was evaluated as immunologic adjuvant for a viral vaccine in a mouse challenge model. When it was administered together with inactivated pseudorabies virus, a herpes simplex virus related alpha- herpesvirus, increased production of IFN-gamma by ex vivo-stimulated splenocytes was observed as well as augmented production of antiviral serum lgG2a. This was associated with increased protection against a lethal challenge infection. Infection of IfN-gamma-neutralizing Ab reduced the increased antiviral resistance in IL-12-treated mice. Also, in mice bearing an inactivated IFN-gamma-receptor gene IL-12 failed to stimulate protection against challenge and the synthesis of antiviral lgG2a. However, in these IFN-gamma-receptor knockout mice, increased antiviral lgG2b levels and enhanced IFN-gamma-secretion, with minimal IL-4 production, by ex vivo-stimulated splenocytes was observed. In wild-type mice administration of recombinant IFN-gamma but not IL-2 mimicked the immune-stimulating activity of IL-12; it is therefore likely that the IL-12 adjuvant activity is largely mediated by physiologic IFN-gamma.
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