title: Negative regulation by SHPS-1 of Toll-like receptor-dependent proinflammatory cytokine production in macrophages.
abstract: SHPS-1 is a transmembrane protein predominantly expressed in macrophages. The possible role of SHPS-1 in regulation of Toll-like receptor (TLR)-dependent production of proinflammatory cytokines by macrophages has remained unknown, however. We now show that expression either of a mutant version of mouse SHPS-1 (SHPS-1-4F) in which the four tyrosine phosphorylation sites in the cytoplasmic region are replaced by phenylalanine or of a chimeric protein comprising the extracellular and transmembrane regions of human CD8 fused to the cytoplasmic region of SHPS-1-4F (CD8-4F) markedly promoted the production of tumor necrosis factor-alpha (TNF-alpha) or interleukin-6 (IL-6) induced by lipopolysaccharide (LPS) or polyinosinic-polycytidylic acid [poly(I : C)] in RAW264.7 macrophages. In contrast, expression of a mutant form of SHPS-1 that lacks most of the cytoplasmic region did not promote such responses. Expression of SHPS-1-4F promoted the LPS- or poly(I : C)-induced activation of NF-kappaB. LPS and poly(I : C) each induced the tyrosine phosphorylation of SHPS-1 through a Src family kinase and the association of SHPS-1 with SHP-1 and SHP-2. These results suggest that LPS or poly(I : C) induces tyrosine phosphorylation of SHPS-1 and the association of SHPS-1 with SHP-1 and SHP-2 in a manner dependent on a Src family kinase. SHPS-1 then negatively regulates TLR4- or TLR3-dependent cytokine production through inhibition of NF-kappaB-dependent signaling.
authors.affiliation: The Laboratory of Biosignal Sciences, Institute for Molecular and Cellular Regulation, Gunma University, 3-39-15 Showa-Machi, Maebashi, Gunma 371-8512, Japan.
authors.forename: Atsuko
authors.initials: A
authors.lastname: Miyake
authors.forename: Yoji
authors.initials: Y
authors.lastname: Murata
authors.forename: Hideki
authors.initials: H
authors.lastname: Okazawa
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ikeda
authors.forename: Yuriko
authors.initials: Y
authors.lastname: Niwayama
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ohnishi
authors.forename: Yukio
authors.initials: Y
authors.lastname: Hirata
authors.forename: Takashi
authors.initials: T
authors.lastname: Matozaki
mesh_terms: D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D016207:Cytokines / Q000096:biosynthesis*; D017931:DNA Primers / Q000235:genetics; D006801:Humans; D020672:I-kappa B Proteins / Q000378:metabolism; D018836:Inflammation Mediators / Q000378:metabolism; D015850:Interleukin-6 / Q000096:biosynthesis; D008070:Lipopolysaccharides / Q000494:pharmacology; D008264:Macrophages / Q000276:immunology* / Q000378:metabolism*; D051379:Mice; D016297:Mutagenesis, Site-Directed; D000072000:NF-KappaB Inhibitor alpha; D016328:NF-kappa B / Q000378:metabolism; D011070:Poly I-C / Q000494:pharmacology; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11 / Q000378:metabolism; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6 / Q000378:metabolism; D011971:Receptors, Immunologic / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D051196:Toll-Like Receptor 3 / Q000378:metabolism; D051197:Toll-Like Receptor 4 / Q000378:metabolism; D051193:Toll-Like Receptors / Q000378:metabolism*; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis
chemical_list: D016207:Cytokines; D017931:DNA Primers; D020672:I-kappa B Proteins; D018836:Inflammation Mediators; D015850:Interleukin-6; D008070:Lipopolysaccharides; D016328:NF-kappa B; C000606204:NFKBIA protein, human; C000606205:Nfkbia protein, mouse; C501922:Sirpa protein, mouse; D011971:Receptors, Immunologic; D011993:Recombinant Fusion Proteins; C519703:TLR3 protein, mouse; C493487:Tlr4 protein, mouse; D051196:Toll-Like Receptor 3; D051197:Toll-Like Receptor 4; D051193:Toll-Like Receptors; D014409:Tumor Necrosis Factor-alpha; D000072000:NF-KappaB Inhibitor alpha; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; C516725:Ptpn11 protein, mouse; C509248:Ptpn6 protein, mouse; D011070:Poly I-C