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J. Virol., Aug 1995, 4842-4846, Vol 69, No. 8
MF Bachmann, H Schorle, R Kuhn, W Muller, H Hengartner, RM Zinkernagel and I Horak
Antiviral immune responses of mice lacking interleukin-2 (IL-2) or IL-4 or
both IL-2 and IL-4 (IL-2/4) were compared by using different viruses.
Primary cytotoxic T-lymphocyte (CTL) responses against lymphocytic
choriomeningitis virus (LCMV) were only moderately reduced in mice lacking
IL-2 and were normal in mice lacking IL-4. Mice deficient in both
interleukins exhibited variable and more strongly reduced but nevertheless
in vivo protective LCMV-specific CTL responses. Similar results were
obtained with vaccinia virus. Upon virus-specific restimulation in vitro,
spleen cells from IL-2- and IL- 2/4-deficient mice failed to generate CTL
responses against virus- infected target cells, whereas the response of
mice deficient in only IL-4 was comparable to that of control mice. The
addition of IL-2 during in vitro restimulation completely restored the
responses of both IL-2 and IL-2/4-deficient mice. T-helper-cell-independent
immunoglobulin M and T-helper-cell-dependent immunoglobulin G antibody
responses against vesicular stomatitis virus glycoprotein were within
normal ranges for the various mutant mice. After LCMV infection, specific
antibody responses against LCMV nucleoprotein were reduced four- to
eightfold. These results show that mice lacking IL-2/4 have an overall
tendency to exhibit more severely reduced CTL responses than IL- 2- or
IL-4-deficient mice. Nevertheless, and surprisingly, in vivo protective
immune responses were mounted in the absence of IL-2/4, suggesting that
besides a minor contribution from IL-4, other interleukins compensate in
vivo for the lack of IL-2 in IL-2-deficient mice.
Copyright © 1995, American Society for Microbiology
Antiviral immune responses in mice deficient for both interleukin-2 and interleukin-4
Department of Pathology, University of Zurich, Switzerland.
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