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The Journal of Immunology, Vol 150, Issue 4 1205-1211, Copyright © 1993 by American Association of Immunologists
ARTICLES |
T Krakauer and JJ Oppenheim
Medical Division, USAMRIID, Fort Detrick, Frederick, MD 21702-5011.
Stimulation of human blood monocytes (adherent mononuclear cells) and the monocytic cell line, THP-1, by IL-1 or TNF-alpha leads to the up- regulation of IFN-gamma receptors. Scatchard analysis using 125I-IFN- gamma revealed a twofold increase in the number of IFN-gamma receptors on THP-1 cells without an alteration in the affinity of the receptor. The potential functional significance of this induction of IFN-gamma receptors on monocytes and THP-1 cells was investigated by examining the effect of IFN-gamma on MHC class II Ag expression by these cells. Both IL-1 and TNF-alpha enhanced the IFN-gamma-induced HLA-DR expression (> twofold) and this effect was inhibited by antibody to IFN- gamma. In the case of human monocytes, IL-1 or TNF-alpha, each by themselves also increased HLA-DR expression, which was also abrogated by antibody to IFN-gamma. The data suggest that the immunopotentiating effects of IL-1 and TNF-alpha are mediated in part by enhancing IFN- gamma receptor expression on monocytes and macrophages. This presumably would increase the capacity of IFN-gamma to activate macrophages, enabling them to express HLA-DR and present Ag more effectively.
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