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Journal of Virology, May 2003, p. 5774-5783, Vol. 77, No. 10
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.10.5774-5783.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Comparison of Adjuvant Efficacy of Herpes Simplex Virus Type 1 Recombinant Viruses Expressing TH1 and TH2 Cytokine Genes

Yanira Osorio1 and Homayon Ghiasi1,2*

Center for Neurobiology and Vaccine Development, Department of Surgery, CSMC Burns & Allen Research Institute, Los Angeles, California 90048,1 Department of Ophthalmology, University of California at Los Angeles School of Medicine, Los Angeles, California 900242

Received 1 November 2002/ Accepted 14 February 2003

The adjuvant effects of cytokines in humoral and cell-mediated immunity to herpes simplex virus type 1 (HSV-1) have been examined in mice using HSV-1 recombinant viruses expressing murine interleukin-2 (IL-2), IL-4, or gamma interferon (IFN-{gamma}) gene. Groups of naive BALB/c mice were immunized intraperitoneally with one or three doses of the HSV-1 recombinant viruses expressing IL-2, IL-4, or IFN-{gamma} or with parental control virus. Despite similar replication kinetics, these three recombinant viruses elicited different immune responses to HSV-1 on immunization. Immunization with the recombinant virus expressing IL-4 elicited a humoral response of greater magnitude than immunization with the recombinant viruses expressing IL-2 or IFN-{gamma} or with parental virus. In contrast, immunization with recombinant virus expressing IL-2 elicited a higher cytotoxic T-cell response than immunization with viruses expressing IL-4 or IFN-{gamma}. Stimulation in vitro of splenocytes obtained from the mice immunized with UV-inactivated HSV-1 McKrae resulted in a TH1 pattern of cytokine expression irrespective of the recombinant virus used in the immunization. As observed for the parental virus, both CD4+ and CD8+ T cells contributed equally to the production of IL-2 by the splenocytes of mice immunized with any of the three recombinant viruses. However, the pattern of IFN-{gamma} production by CD4+ and CD8+ T cells differed according to the recombinant virus used. After lethal ocular challenge, all immunized mice were protected completely against death and manifestations of eye disease caused by HSV-1, which are typical responses in unimmunized mice. Mice immunized with IL-4-expressing virus cleared the virus from their eyes more rapidly than mice immunized with IL-2- or IFN-{gamma}-expressing virus. Taken together, our results suggest that, in contrast to IFN-{gamma} which did not exhibit an adjuvant effect, both IL-4 and IL-2 act as adjuvants in immunization with HSV, with IL-4 showing greater efficacy.

* Corresponding author. Mailing address: Center for Neurobiology and Vaccine Development, CSMC Burns & Allen Research Institute, D2024, 8700 Beverly Blvd., Los Angeles, CA 90048. Phone: (310) 423-0593. Fax: (310) 423-0302. E-mail: ghiasih{at}cshs.org.

Journal of Virology, May 2003, p. 5774-5783, Vol. 77, No. 10
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.10.5774-5783.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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