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A novel MyD-1 (SIRP-1{alpha}) signaling pathway that inhibits LPS-induced TNF{alpha} production by monocytes

Smith, R.E. and Patel, V. and Seatter, S.D. and Deehan, M.R. and Brown, M.H. and Brooke, G.P. and Goodridge, H.S. and Howard, C.J. and Rigley, K.P. and Harnett, W. and Harnett, M.M. (2003) A novel MyD-1 (SIRP-1{alpha}) signaling pathway that inhibits LPS-induced TNF{alpha} production by monocytes. Blood, 102. pp. 2532-2540. ISSN 0006-4971

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Abstract

MyD-1 (CD172) is a member of the family of signal regulatory phosphatase (SIRP) binding proteins, which is expressed on human CD14+ monocytes and dendritic cells. We now show a novel role for MyD-1 in the regulation of the innate immune system by pathogen products such as lipopolysaccharide (LPS), purified protein derivative (PPD), and Zymosan. Specifically, we demonstrate that ligation of MyD-1 on peripheral blood mononuclear cells (PBMCs) inhibits tumor necrosis factor alpha (TNF{alpha}) secretion but has no effect on other cytokines induced in response to each of these products. In an attempt to understand the molecular mechanisms underlying this surprisingly selective effect we investigated signal transduction pathways coupled to MyD-1. Ligation of the SIRP was found to recruit the tyrosine phosphatase SHP-2 and promote sequential activation of phosphatidylinositol (PI) 3-kinase, phospholipase D, and sphingosine kinase. Inhibition of LPS-induced TNF{alpha} secretion by MyD-1 appears to be mediated by this pathway, as the PI 3-kinase inhibitor wortmannin restores normal LPS-driven TNF{alpha} secretion. MyD-1-coupling to this PI 3-kinase-dependent signaling pathway may therefore present a novel target for the development of therapeutic strategies for combating TNF{alpha} production and consequent inflammatory disease.

Item type: Article
ID code: 10513
Keywords: signaling pathway, LPS-induced TNF{alpha} production, LPS, monocytes, Pharmacy and materia medica
Subjects: Medicine > Pharmacy and materia medica
Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
Unknown Department
Faculty of Humanities and Social Sciences (HaSS) > School of Psychological Science and Health > Counselling
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 23 Sep 2010 15:04
    Last modified: 12 Mar 2012 10:53
    URI: http://strathprints.strath.ac.uk/id/eprint/10513

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