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The Journal of Immunology, Vol 154, Issue 11 5832-5841, Copyright © 1995 by American Association of Immunologists
ARTICLES |
MJ Skeen and HK Ziegler
Department of Microbiology and Immunology, Emory University, Atlanta, GA 30322, USA.
Gamma delta T cells are found at sites of microbial infection and have been reported to proliferate in response to bacterial Ags. We show here that although the response by Listeria-elicited peritoneal gamma delta T cells to heat-killed bacteria in the presence of macrophage accessory cells may be partially mediated via the TCR, it is predominantly mediated via cytokines produced by the macrophages. Macrophage cytokines IL-12 and IL-1 synergize to induce some proliferation and considerable IFN-gamma production by peritoneal gamma delta T cells. This cytokine synergy pattern differs from that reported for NK cells, in which IL-12 in combination with either IL-2 or TNF-alpha induces NK cells to produce IFN-gamma. The combination of IL-12 and IL-1 provides a strong stimulus for IFN-gamma production by gamma delta T cells, but a relatively weak signal for proliferation. This is in contrast to the strong proliferative signal from the combination of IL-7 and IL-1 and the relatively weak stimulation of IFN-gamma production by the IL-7/IL- 1 combination. Thus, there is differential regulation of NK and gamma delta T cells by cytokines and differential regulation of activation functions within the gamma delta T cell population by combinations of cytokines. These data provide evidence for a potentially important pathway for augmentation of IFN-gamma secretion at sites of infection where gamma delta T cells are found in abundance and where IFN-gamma may play a major role in the control of the infection.
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