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J. Virol., 08 1995, 4711-4716, Vol 69, No. 8
E Manickan, M Francotte, N Kuklin, M Dewerchin, C Molitor, D Gheysen, M Slaoui and BT Rouse
This study was designed to evaluate the efficacy and mechanisms of
protection mediated by recombinant vaccinia viruses encoding immediate-
early (IE) proteins of herpes simplex virus type 2 (HSV-2). Three mouse
strains were immunized against the IE proteins ICP27, ICP0, and ICP4, and
mice were challenged intracutaneously in the zosteriform model with HSV-2
strain MS. Protection was observed only following immunization with the
ICP27 construct and then only in the BALB/c mouse strain. Protection in
BALB/c mice was ablated by CD4+ T-cell suppression but remained intact in
animals depleted of CD8+ T cells. Moreover, protection could be afforded to
SCID nude recipients with CD4+ but not CD8+ T cells from ICP27-immunized
mice. Only BALB/c mice developed a delayed-type hypersensitivity reaction
to HSV-2, and in vitro measurements of humoral and cell-mediated immunity
revealed response patterns to ICP27 and HSV that differed between protected
BALB/c and unprotected mouse strains. Accordingly, BALB/c responses showed
antigen- induced cytokine profiles dominated by type 1 cytokines, whereas
C57BL/6 and C3H/HeN mice generated cytokine responses mainly of the type 2
variety. Our results may indicate that protection against zosterification
is mainly mediated by CD4+ T cells that express a type 1 cytokine profile
and that protective vaccines against HSV which effectively induce such
T-cell responses should be chosen.
Copyright © 1995, American Society for Microbiology
Vaccination with recombinant vaccinia viruses expressing ICP27 induces protective immunity against herpes simplex virus through CD4+ Th1+ T cells
Department of Microbiology, College of Veterinary Medicine, University of Tennessee, Knoxville 37996-0845, USA.
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