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. 1991 May;59(5):1709–1715. doi: 10.1128/iai.59.5.1709-1715.1991

Regulation of gamma interferon production by natural killer cells in scid mice: roles of tumor necrosis factor and bacterial stimuli.

J C Wherry 1, R D Schreiber 1, E R Unanue 1
PMCID: PMC257906  PMID: 1902195

Abstract

CB-17 scid mice exhibit a T-cell-independent but gamma interferon (IFN-gamma)-dependent immunity to Listeria monocytogenes. In this study, we analyzed the specific cellular interactions involved in this process. scid mouse-derived natural killer (NK) cells cultured with heat-killed (HK) L. monocytogenes and macrophages secreted IFN-gamma. No IFN-gamma was produced in cultures containing HK L. monocytogenes but lacking macrophages. However, medium derived from macrophages incubated with HK L. monocytogenes or other microorganisms stimulated IFN-gamma production by isolated NK cells. Treatment of macrophage-conditioned supernatants with neutralizing monoclonal anti-tumor necrosis factor (TNF) significantly reduced their capacity to stimulate NK cells to produce IFN-gamma. Yet, purified recombinant TNF-alpha by itself was unable to stimulate NK cells. Thus, TNF was necessary but not sufficient to induce maximal IFN-gamma production by NK cells. Sonicated L. monocytogenes stimulated production of IFN-gamma by NK cells that was resistant to anti-TNF. Stimulation was markedly enhanced by the addition of recombinant TNF-alpha. These studies demonstrated that activation of scid NK cells for secretion of IFN-gamma requires two signals: TNF-alpha and a second product which may be of bacterial origin and may require processing by mononuclear phagocytes. We suggest that the T-cell-independent production of IFN-gamma by NK cells provides the host with a rapid mechanism to temporarily heighten nonspecific resistance to infection until such time as T-cell-dependent sterilizing immune responses can be generated.

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Selected References

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