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Institute of Experimental Immunology, Department of Pathology, University of Zürich, Zürich, Switzerland
To investigate the physiological role of IL-12 in viral infections
in terms of T cell cytokine responses involved in virus-specific Ig
isotype induction and in antiviral protection, immune responses
elicited upon infection of IL-12-deficient mice with lymphocytic
choriomeningitis virus (LCMV) or vesicular stomatitis virus (VSV) were
studied. Infection of IL-12-deficient mice with LCMV induced a
virus-specific type 1 cytokine response as determined by in vitro
cytokine secretion patterns as well as by in vivo intracellular
cytokine staining of LCMV-specific CD4+ TCR transgenic T
cells that had clonally expanded in LCMV-infected IL-12-deficient
recipient mice. In addition, LCMV- and VSV-specific IgG responses
exhibited normal serum IgG2a/IgG1 ratios, demonstrating again
virus-specific CD4+ T cell induction of type 1 phenotype in
IL-12-deficient mice upon viral infection. LCMV and VSV immune mice
were found to be protected against challenge immunization with
recombinant vaccinia viruses expressing either the LCMV- or the
VSV-derived glycoprotein, respectively. This protection is known to be
mediated by T cell-secreted type 1 cytokines IFN-
and TNF-
. In
contrast, IL-12-deficient mice showed impaired abilities to control
infection with the facultative intracellular bacterium Listeria
monocytogenes at early time points after infection. However, at
later time points of infection, IL-12-deficient mice were able to clear
infection. These findings may indicate that viruses are able to induce
type 1 T cell responses in the absence of IL-12 as opposed to some
bacterial or parasitical infections that are crucially dependent on the
presence of IL-12 for the induction of type 1 immune
responses.
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