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J. Virol., Aug 1996, 5230-5235, Vol 70, No. 8
TM Moran, H Isobe, A Fernandez-Sesma and JL Schulman
Two different subsets of T cells, Th1 and Th2 cells, have been demonstrated
to secrete different profiles of cytokines and to influence various
infections in different ways. Whereas cytokines secreted by Th1 cells,
particularly gamma interferon, promote the generation of cell-mediated
immunity, Th2 cells and their cytokines (interleukin-4 [IL-4], IL-5, IL-10,
and IL-13) have been shown to function in recovery from parasitic
infections and in antibody responses. In this study, we analyzed the
effects of the dominant Th2 cytokine, IL-4, on immunity to virus infection.
We assessed the effects of IL-4 on both secondary immune responses by an
adoptive transfer assay and primary immune responses by in vivo treatment
of influenza virus-infected mice with IL-4. The results demonstrated that
IL-4 can function to inhibit antiviral immunity at both stages. We found
that IL- 4 treatment of sensitized cells during secondary stimulation in
vitro had little effect on their ability to lyse virus-infected target
cells in a 51Cr release assay. Nevertheless, the clearance of influenza
A/PR/8/34 (H1N1) virus from the lungs of infected BALB/c mice was
significantly delayed after the transfer of virus-specific T cells
secondarily stimulated in the presence of IL-4 in comparison to virus
clearance in recipients of cells stimulated in the absence of IL-4. In
contrast to the adoptive transfer results, the treatment of PR8 virus-
infected mice with IL-4 during primary infection greatly suppressed the
generation of cytotoxic T-cell precursors, as assessed by secondary
stimulation in vitro. In addition, culture supernatants of secondarily
stimulated spleen cells from IL-4-treated mice contained significantly less
gamma interferon and more IL-4 than did spleen cells from controls. More
importantly, the treatment of mice with IL-4 resulted in an extremely
significant delay in virus clearance. Thus, IL-4 can inhibit both primary
and secondary antiviral immune responses.
Copyright © 1996, American Society for Microbiology
Interleukin-4 causes delayed virus clearance in influenza virus- infected mice
Department of Microbiology, Mount Sinai School of Medicine, New York 10029, USA.
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