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Genes Cells. 2008 Feb;13(2):209-19. doi: 10.1111/j.1365-2443.2007.01161.x.

Negative regulation by SHPS-1 of Toll-like receptor-dependent proinflammatory cytokine production in macrophages.

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1
The Laboratory of Biosignal Sciences, Institute for Molecular and Cellular Regulation, Gunma University, 3-39-15 Showa-Machi, Maebashi, Gunma 371-8512, Japan.

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.

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