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Animal: DNA Viruses |
-secreting CD4+ T cells in innate and adaptive immune control of genital herpes simplex virus type 2 infection in mice
Departments of Medical Microbiology and Immunology1 and Clinical Virology2, Göteborg University, Guldhedsgatan 10A, 413 46 Göteborg, Sweden
Author for correspondence: Kristina Eriksson. Fax +46 31 820160. e-mail kristina.eriksson{at}microbio.gu.se
The role of B, CD4+ T and CD8+ T cells in both primary genital infection with attenuated herpes simplex virus type 2 (HSV-2) and development of protective immunity to a later challenge with virulent HSV-2 using lymphocyte-deficient mice has been elucidated. Following primary inoculation with attenuated thymidine kinase-deficient (TK-) HSV-2, B cell-deficient (µMT) mice developed a local viraemia and transient genital inflammation, suggesting a role for B cells in the innate control of local infection and inflammation. Natural antibodies are implicated in this process, as passive transfer of normal serum into µMT mice significantly reduced HSV-2 TK- shedding in the vaginal lumen, although it did not affect subsequent inflammation. Protection against lethal HSV-2 challenge was noted in HSV-2-vaccinated wild-type, CD8+ T cell-deficient and µMT mice and was characterized by strong virus-specific IFN-
responses in vitro and delayed type hypersensitivity (DTH) responses in vivo. In contrast, CD4+ T cell-deficient (CD4-/-) mice had impaired HSV-2-specific IFN-
production and DTH responses and succumbed rapidly to genital HSV-2 challenge. However, protective responses to HSV-2 could be induced in HSV-2-vaccinated CD4-/- mice by treatment with recombinant IFN-
. Taken together, these results suggest that CD4+ T cells secreting IFN-
are critical for immune protection against lethal genital HSV-2 re-infection, whereas B cells/natural antibodies have anti-viral and -inflammatory effects in the innate control of a primary infection.
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