title: Interferon gamma priming is not critical for IL-12 production of murine spleen cells.
abstract: Interferon gamma (IFN-gamma) priming is considered to be critical for interleukin 12 (IL-12) production of murine macrophages and human monocytes by lipopolysaccharide (LPS) stimulation. In our present experiments, freshly prepared spleen cells (f-spleen cells) were confirmed not to produce detectable level of IL-12 by LPS stimulation, although they produced significant amount of IL-12 by the stimulation with LPS plus IFN-gamma. However, the stimulation only with LPS induced IL-12 production of spleen cells preincubated in the absence of IFN-gamma. Findings on IL-12 p40 mRNA accumulation were consistent with their IL-12 production. Essentially the same results were obtained using spleen cells from IFN-gamma deficient mice. In the presence of anti-IL-10, f-spleen cells produced IL-12 upon LPS stimulation, indicating that the failure of f-spleen cells in IL-12 production is caused by IL-10 produced by themselves upon LPS stimulation. In addition, f-spleen cells produced IL-12 upon CD40 ligand stimulation, and the production was hardly affected by the presence of IFN-gamma or preincubation. These results indicate that IFN-gamma priming is not critical for IL-12 production of spleen cells stimulated with LPS or CD40 ligand, although IFN-gamma enhances the production, especially, in response to LPS stimulation.
authors.affiliation: Department of Allergology, Institute of Medical Science, University of Tokyo, 4-6-1 Shiroganedai, Minatoku, Tokyo, 108-8639, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Hino
authors.forename: O
authors.initials: O
authors.lastname: Igarashi
authors.forename: Y I
authors.initials: YI
authors.lastname: Tagawa
authors.forename: Y
authors.initials: Y
authors.lastname: Iwakura
authors.forename: H
authors.initials: H
authors.lastname: Nariuchi
mesh_terms: D000818:Animals; D023201:CD40 Ligand; D007371:Interferon-gamma / Q000378:metabolism*; D016753:Interleukin-10 / Q000096:biosynthesis; D018664:Interleukin-12 / Q000037:antagonists & inhibitors / Q000096:biosynthesis* / Q000235:genetics; D008070:Lipopolysaccharides / Q000378:metabolism*; D008264:Macrophages / Q000276:immunology; D008562:Membrane Glycoproteins / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D012333:RNA, Messenger / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013154:Spleen / Q000166:cytology / Q000276:immunology*
chemical_list: D008070:Lipopolysaccharides; D008562:Membrane Glycoproteins; D012333:RNA, Messenger; D016753:Interleukin-10; D023201:CD40 Ligand; D018664:Interleukin-12; D007371:Interferon-gamma