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J. Virol., 08 1995, 4792-4796, Vol 69, No. 8
MF van den Broek, U Muller, S Huang, M Aguet and RM Zinkernagel
Alpha/beta interferon (IFN) and gamma IFN exert widely overlapping
biological effects. Still, mice with individually inactivated alpha/beta or
gamma receptors exhibit variably severely reduced resistance to infection
and altered immune responses. To investigate to what extent the two IFN
systems are functionally redundant, we generated mice with a combined
receptor defect (AG129 mice). Like mice with individual mutations, AG129
mice had no apparent anomalies, confirming that in the mouse the IFN system
is not essential for normal development. These mice showed an additive
phenotype with respect to antiviral defense and exhibited an increased
susceptibility to lymphocytic choriomeningitis virus (LCMV) and notably
vaccinia virus infection. Because of unlimited replication and subsequent
rapid exhaustion of cytotoxic T lymphocyte (CTL) precursors, these mice
were unable to mount a CTL response to LCMV. CD8(+)-mediated
immunopathology was absent in LCMV-infected mice, and virus persisted.
Vaccinia virus replicated much faster in AG129 mice, and a 10(4)-fold lower
dose of vaccinia virus was sufficient to prime these mice. With the normal
priming dose of 10(6) PFU, cytopathic effects and overwhelming infection
possibly causing partial exhaustion of CTL interfered with the
anti-vaccinia virus response. Even though global antiviral immunoglobulin G
(IgG) titers were within normal ranges, the IgG subclass distribution was
heavily biased toward IgG1.
Copyright © 1995, American Society for Microbiology
Antiviral defense in mice lacking both alpha/beta and gamma interferon receptors
Institute of Experimental Immunology, University of Zurich, Switzerland.
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