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The Journal of Immunology, Vol 155, Issue 7 3546-3551, Copyright © 1995 by American Association of Immunologists
ARTICLES |
SW Chensue, JH Ruth, K Warmington, P Lincoln and SL Kunkel
Department of Pathology, Veterans Affairs Medical Center, Ann Arbor, MI 48105, USA.
IL-12 is a pivitol cytokine that promotes NK cell activity and Th1 (type 1)-mediated immune responses. This study analyzed the cytokines that regulate macrophage (M phi) IL-12 production in vitro and in vivo. IL-12 was produced by elicited but not resident peritoneal M phi stimulated with endotoxin. Addition of graded doses of cytokines (0.1 to 10 ng/ml) indicated that the Th1-related (type 1) cytokine, IFN- gamma, augmented endotoxin-stimulated IL-12 production by nearly sixfold in oil-elicited M phi. TNF-alpha also increased production but only at the 10 ng/ml concentration. In contrast, the Th2-related (type 2) cytokines, IL-4 and especially IL-10, were profoundly inhibitory. IL- 1 beta and IL-2 had no effect. For in vivo analysis, type 1 and type 2 cytokine-mediated lung granulomas (GR) were induced in presensitized mice by embolization of beads coupled to purified protein derivative of Mycobacteria tuberculosis or soluble Ags derived from Schistosoma mansoni eggs. Analysis of M phi isolated from type 1, type 2, or control pulmonary GR revealed that M phi of type 2 GR develop impaired IL-12-producing capacity. Depletion studies using anti-IFN, anti-IL-12, anti-IL-10, and anti-IL-4 neutralizing polyclonal Abs corroborated the in vitro studies. Anti-IFN or anti-IL-12 reduced IL-12 production by M phi from type 1 GR (70 to 80%) as well as IFN and IL-12 production by draining lymph nodes (75 to 90%). Conversely, anti-IL-10 and anti-IL-4 reversed the impaired IL-12 production observed in type 2 GR M phi. These data indicate a positive feedback stimulation of IL-12 production by IFN that is regulated by IL-10 and IL-4 in vivo.
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