PMID:11490012

Citation	Supajatura, V, Ushio, H, Nakao, A, Okumura, K, Ra, C and Ogawa, H (2001) Protective roles of mast cells against enterobacterial infection are mediated by Toll-like receptor 4. J. Immunol. 167:2250-6
Abstract	Toll-like receptors (TLRs) are mammalian homologues of the Drosophila Toll receptors and are thought to have roles in innate recognition of bacteria. We demonstrated that TLR 2, 4, 6, and 8 but not TLR5 were expressed on mouse bone marrow-derived mast cells (BMMCs). Using BMMCs from the genetically TLR4-mutated strain C3H/HeJ, we demonstrated that functional TLR4 was required for a full responsiveness of BMMCs to produce inflammatory cytokines (IL-1beta, TNF-alpha, IL-6, and IL-13) by LPS stimulation. TLR4-mediated stimulation of mast cells by LPS was followed by activation of NF-kappaB but not by stress-activated protein kinase/c-Jun NH2-terminal kinase signaling. In addition, in the cecal ligation and puncture-induced acute septic peritonitis model, we demonstrated that genetically mast cell-deficient W/W(v) mice that were reconstituted with TLR4-mutated BMMCs had significantly higher mortality than W/W(v) mice reconstituted with TLR4-intact BMMCs. Higher mortality of TLR4-mutated BMMC-reconstituted W/W(v) mice was well correlated with defective neutrophil recruitment and production of proinflammatory cytokines in the peritoneal cavity. Taken together, these observations provide definitive evidence that mast cells play important roles in exerting the innate immunity by releasing inflammatory cytokines and recruitment of neutrophils after recognition of enterobacteria through TLR4 on mast cells.
Links	PubMed
Keywords	Acute Disease; Animals; Bone Marrow Cells/immunology; Bone Marrow Cells/metabolism; Bone Marrow Transplantation; Cell Degranulation/immunology; Cytokines/biosynthesis; Disease Models, Animal; Drosophila Proteins; Enterobacteriaceae Infections/genetics; Enterobacteriaceae Infections/immunology; Enterobacteriaceae Infections/mortality; Enterobacteriaceae Infections/pathology; Lipopolysaccharides/pharmacology; Mast Cells/immunology; Mast Cells/metabolism; Mast Cells/transplantation; Membrane Glycoproteins/deficiency; Membrane Glycoproteins/genetics; Membrane Glycoproteins/physiology; Mice; Mice, Inbred BALB C; Mice, Inbred C3H; Mice, Inbred C57BL; Mice, Mutant Strains; NF-kappa B/physiology; Neutrophil Infiltration/genetics; Neutrophil Infiltration/immunology; Peritonitis/genetics; Peritonitis/immunology; Peritonitis/mortality; Peritonitis/pathology; RNA, Messenger/biosynthesis; Receptors, Cell Surface/deficiency; Receptors, Cell Surface/genetics; Receptors, Cell Surface/physiology; Sepsis/genetics; Sepsis/immunology; Sepsis/mortality; Sepsis/pathology; Signal Transduction/immunology; Toll-Like Receptor 2; Toll-Like Receptor 4; Toll-Like Receptor 5; Toll-Like Receptors
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