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Infect. Immun., May 1996, 1744-1749, Vol 64, No. 5
CH Ladel, C Blum and SH Kaufmann
Listeria monocytogenes is an intracellular bacterium which causes an acute
infectious disease in mice. Initial host resistance depends on innate
immunity mediated primarily by natural killer (NK) cells followed by
specific alpha/beta T cells, which are central to acquired specific
immunity. Gamma/delta T lymphocytes seem to provide a link between the
innate and the specific immune response. All these lymphocyte populations
produce gamma interferon (IFN-gamma), which, because of its
macrophage-activating potential, is central to antibacterial protection.
IFN-gamma from NK cells not only contributes to early host resistance but
also promotes development of protective T- cell responses of helper T type
1 (Th1) type. Here, we show that innate resistance and early IFN-gamma
production in listeriosis are markedly impaired in T-cell receptor
(TCR)-delta-/- but not TCR-beta-/- gene disruption mutant mice. By
two-color cytofluorimetry, we demonstrate that NK cells rather than
gamma/delta T lymphocytes are the major cellular source of IFN-gamma in
immunocompetent mice and that IFN-gamma production by NK cells is impaired
in the TCR-delta-/- mutants. Probably, reduced tumor necrosis factor
production in listeria-infected TCR-delta-/- mutants contributed to
impaired NK cell activation. Our data reveal a novel function of
gamma/delta T cells as regulators of innate resistance against sublethal
infection with an intracellular pathogen.
Copyright © 1996, American Society for Microbiology
Control of natural killer cell-mediated innate resistance against the intracellular pathogen Listeria monocytogenes by gamma/delta T lymphocytes
Department of Immunology, University of Ulm, Germany.
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