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Journal of Virology, February 2001, p. 1664-1671, Vol. 75, No. 4
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.4.1664-1671.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Protective Mucosal Immunity to Ocular Herpes Simplex Virus Type 1 Infection in Mice by Using Escherichia coli Heat-Labile Enterotoxin B Subunit as an Adjuvant

C. M. Richards,* A. T. Aman, T. R. Hirst, T. J. Hill, and N. A. Williams

Department of Pathology and Microbiology, School of Medical Sciences, University of Bristol, Bristol BS8 1TD, United Kingdom

Received 15 June 2000/Accepted 14 November 2000

The potential of nontoxic recombinant B subunits of cholera toxin (rCtxB) and its close relative Escherichia coli heat-labile enterotoxin (rEtxB) to act as mucosal adjuvants for intranasal immunization with herpes simplex virus type 1 (HSV-1) glycoproteins was assessed. Doses of 10 µg of rEtxB or above with 10 µg of HSV-1 glycoproteins elicited high serum and mucosal anti-HSV-1 titers comparable with that obtained using CtxB (10 µg) with a trace (0.5 µg) of whole toxin (Ctx-CtxB). By contrast, doses of rCtxB up to 100 µg elicited only meager anti-HSV-1 responses. As for Ctx-CtxB, rEtxB resulted in a Th2-biased immune response with high immunoglobulin G1 (IgG1)/IgG2a antibody ratios and production of interleukin 4 (IL-4) and IL-10 as well as gamma interferon by proliferating T cells. The protective efficacy of the immune response induced using rEtxB as an adjuvant was assessed following ocular challenge of immunized and mock-immunized mice. Epithelial disease was observed in both groups, but the immunized mice recovered by day 6 whereas mock-immunized mice developed more severe corneal disease leading to stromal keratitis. In addition, a significant reduction in the incidence of lid disease and zosteriform spread was observed in immunized animals and there was no encephalitis compared with 95% encephalitis in mock-immunized mice. The potential of such mucosal adjuvants for use in human vaccines against pathogens such as HSV-1 is discussed.

* Corresponding author. Mailing address: Department of Pathology and Microbiology, School of Medical Sciences, University of Bristol, University Walk, Bristol BS8 1TD, United Kingdom. Phone: 44 (0)117 928 7585. Fax: 44 (0)117 928 7896. E-mail: Claire.M.Richards{at}bristol.ac.uk.

Journal of Virology, February 2001, p. 1664-1671, Vol. 75, No. 4
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.4.1664-1671.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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