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Interleukin 12 and tumor necrosis factor alpha are costimulators of interferon gamma production by natural killer cells in severe combined immunodeficiency mice with listeriosis, and interleukin 10 is a physiologic antagonist



Interleukin 12 and tumor necrosis factor alpha are costimulators of interferon gamma production by natural killer cells in severe combined immunodeficiency mice with listeriosis, and interleukin 10 is a physiologic antagonist



Proceedings of the National Academy of Sciences of the United States of America 90(8): 3725-3729



Listeriosis in mice with the severe combined immunodeficiency (SCID) mutation is an established model in vivo and in vitro of interferon gamma (IFN-gamma)-dependent macrophage activation by natural killer (NK) cells during the development of natural immunity. We demonstrate that IFN-gamma production from SCID splenocytes is stimulated by interleukin (IL) 12, tumor necrosis factor alpha (TNF-alpha), and IL-2 but is inhibited by IL-10, IL-10, IL-12, and TNF are induced by heat-killed Listeria monocytogenes (hk-LM) from SCID splenocytes and peritoneal macrophages. IL-12 production is necessary for hk-LM to stimulate IFN-gamma production by SCID splenocytes since neutralization of IL-12 totally blocks IFN-gamma production in this system. TNF-alpha and IL-2 act synergistically with IL-12 to augment IFN-gamma production. Also, exogenous IL-2 increases the response of NK cells to hk-LM or to IL-12 and TNF-alpha. In contrast, IL-10 inhibits hk-LM-induced IFN-gamma production at two levels: (i) by inhibiting TNF and IL-12 production from these cultures (presumably from the macrophage) and (ii) by inhibiting the stimulatory effects of IL-12 and TNF-alpha on NK-cell IFN-gamma production. Thus, these data indicate that macrophage production of TNF-alpha and IL-12 stimulates the release of IFN-gamma by NK cells and that IL-10 produced in response to hk-LM inhibits this response at the level of the macrophage and the NK cell.

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Accession: 008897730

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PMID: 8097322

DOI: 10.1073/pnas.90.8.3725


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