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Infect. Immun., 04 1996, 1252-1258, Vol 64, No. 4
A Nakane, S Nishikawa, S Sasaki, T Miura, M Asano, M Kohanawa, K Ishiwata and T Minagawa
The production and roles of endogenous interleukin-4 (IL-4) and IL-10 in a
sublethal infection with Listeria monocytogenes were studies in normal mice
and anti-gamma interferon (IFN-gamma) monoclonal antibody (MAb)-pretreated
mice. In normal mice, the expression of mRNAs for IL-4 and IL-10, which was
amplified by reverse transcription-PCR, was induced in the spleens and
livers either early or late in infection, although the serum IL-4 and IL-10
were not detectable by enzyme-linked immunosorbent assays. In vivo
administration of anti-IL-4 MAb showed no effect on antilisterial
resistance, whereas anti-IL-10 MAb partially diminished the defense. In
anti-IFN-gamma MAb-pretreated mice, a delay in the bacterial elimination
from the spleens and livers was observed and high titers of serum IL-4 and
IL-10 were induced late in infection. Production of endogenous IL-4 and
IL-10 was suppressed in both CD4+ cell-and CD8+ cell depleted mice. The
suppression of antilisterial resistance in anti-IFN-gamma MAb-pretreated
mice was canceled when anti- IL-4 MAb was injected late in infection,
whereas anti-IL-10 MAb showed no effect. These results suggest that the
host immune responses were polarized into the T-helper 2 phenotype in
anti-IFN-gamma MAb- pretreated mice and that inhibition of host resistance
against L. monocytogenes by depletion of IFN-gamma might be attributable to
IL-4 produced by T cells polarized into the T-helper 2 phenotype as well as
the inhibition of the IFN-gamma effects.
Copyright © 1996, American Society for Microbiology
Endogenous interleukin-4, but not interleukin-10, is involved in suppression of host resistance against Listeria monocytogenes infection in interferon-depleted mice
Department of Bacteriology, Hirosaki University School of Medicine, Japan.
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