We are studying the mechanism by which sphingolipids regulate immunity and inflammation. Our focus has been on sphingosine-1-phosphate (S1P), a bioactive lipid enriched in the vascular and lymphatic systems, and the S1P receptors, found on immune cells and the endothelium. Essential roles for S1P and its receptors have been found for immune system development and homeostasis as well as for the regulation of immune responses and inflammation. We are studying the individual roles of the S1P receptors and the sphingolipid metabolic pathway in inflammation and immunity.

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Proia, Richard L; Hla, Timothy (2015) Emerging biology of sphingosine-1-phosphate: its role in pathogenesis and therapy. J Clin Invest 125:1379-87
Blaho, Victoria A; Galvani, Sylvain; Engelbrecht, Eric et al. (2015) HDL-bound sphingosine-1-phosphate restrains lymphopoiesis and neuroinflammation. Nature 523:342-6
Weth, Daniela; Benetti, Camilla; Rauch, Caroline et al. (2015) Activated platelets release sphingosine 1-phosphate and induce hypersensitivity to noxious heat stimuli in vivo. Front Neurosci 9:140
Galvani, Sylvain; Sanson, Marie; Blaho, Victoria A et al. (2015) HDL-bound sphingosine 1-phosphate acts as a biased agonist for the endothelial cell receptor S1P1 to limit vascular inflammation. Sci Signal 8:ra79
Kono, Mari; Proia, Richard L (2015) Imaging S1P1 activation in vivo. Exp Cell Res 333:178-82
Kono, Mari; Tucker, Ana E; Tran, Jennifer et al. (2014) Sphingosine-1-phosphate receptor 1 reporter mice reveal receptor activation sites in vivo. J Clin Invest 124:2076-86
Giannouli, Christina C; Chandris, Panagiotis; Proia, Richard L (2014) Visualizing S1P-directed cellular egress by intravital imaging. Biochim Biophys Acta 1841:738-44
Zhang, Wenliang; Mottillo, Emilio P; Zhao, Jiawei et al. (2014) Adipocyte lipolysis-stimulated interleukin-6 production requires sphingosine kinase 1 activity. J Biol Chem 289:32178-85
Xiong, Yuquan; Lee, Hyuek Jong; Mariko, Boubacar et al. (2013) Sphingosine kinases are not required for inflammatory responses in macrophages. J Biol Chem 288:32563-73
Olivera, Ana; Kitamura, Yoshiaki; Wright, Laurel D et al. (2013) Sphingosine-1-phosphate can promote mast cell hyper-reactivity through regulation of contactin-4 expression. J Leukoc Biol :

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