title: Involvement of mast cells in IL-12/23 p40 production is essential for survival from polymicrobial infections.
abstract: Interleukin-12 (IL-12), a heterodimeric cytokine (p35/p40) produced mainly from macrophages and dendritic cells, is an important regulator of T-helper 1 cell responses and for host defense. We found that interferon (IFN) consensus sequence binding protein (ICSBP), which is a transcription factor essential for the expression of p40, was expressed in mouse bone marrow-derived mast cells (BMMCs). The transcription levels of p35 and p40 were increased by stimulation of BMMCs with IFN-gamma/lipopolysaccharide (LPS). IL-12 was secreted from BMMCs in response to LPS but not by FcepsilonRI cross-linking. The p40 levels in the peritoneal cavity of mast cell-deficient W/W(v) and W/W(v) reconstituted with p40(-/-) BMMCs were significantly lower than those of WBB6F(1)(+/+) and wild-type (WT) BMMC-reconstituted W/W(v) in the acute septic peritonitis model. The survival rate of W/W(v) reconstituted with p40(-/-) BMMCs was significantly decreased compared to those of WBB6F(1)(+/+) and WT-BMMC-reconstituted W/W(v), which was due to reduced production of IFN-gamma and subsequent impaired activation of neutrophils in the peritoneal cavity. Survival rate of p40(-/-) mice was also restored by adoptive transfer of WT-BMMCs. These results demonstrate that mast cells play a significant role in the production of IL-12 required for host defense. This is the first report to demonstrate that mast cells are a crucial source of functional IL-12.
authors.affiliation: Atopy (Allergy) Research Center, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan.
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Nakano
authors.forename: Chiharu
authors.initials: C
authors.lastname: Nishiyama
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Kanada
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Niwa
authors.forename: Naomi
authors.initials: N
authors.lastname: Shimokawa
authors.forename: Hiroko
authors.initials: H
authors.lastname: Ushio
authors.forename: Makoto
authors.initials: M
authors.lastname: Nishiyama
authors.forename: Ko
authors.initials: K
authors.lastname: Okumura
authors.forename: Hideoki
authors.initials: H
authors.lastname: Ogawa
mesh_terms: D000818:Animals; D001424:Bacterial Infections / Q000378:metabolism* / Q000473:pathology; D003713:Dendritic Cells / Q000276:immunology*; D007371:Interferon-gamma / Q000378:metabolism; D018664:Interleukin-12 / Q000096:biosynthesis* / Q000378:metabolism; D053762:Interleukin-12 Subunit p40 / Q000096:biosynthesis*; D008407:Mast Cells / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D009504:Neutrophils / Q000378:metabolism / Q000382:microbiology*; D010538:Peritonitis / Q000382:microbiology*; D018805:Sepsis / Q000097:blood*
chemical_list: D053762:Interleukin-12 Subunit p40; D018664:Interleukin-12; D007371:Interferon-gamma