Picture of athlete cycling

Open Access research with a real impact on health...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the Physical Activity for Health Group based within the School of Psychological Sciences & Health. Research here seeks to better understand how and why physical activity improves health, gain a better understanding of the amount, intensity, and type of physical activity needed for health benefits, and evaluate the effect of interventions to promote physical activity.

Explore open research content by Physical Activity for Health...

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

Full text not available in this repository. Request a copy from the Strathclyde author

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.