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Promotion of Lymphocyte Egress into Blood and Lymph by Distinct Sources of Sphingosine-1-Phosphate
Rajita Pappu,1*Susan R. Schwab,2*Ivo Cornelissen,1João P. Pereira,2Jean B. Regard,1Ying Xu,2Eric Camerer,1Yao-Wu Zheng,1Yong Huang,3Jason G. Cyster,2Shaun R. Coughlin1
Lymphocytes require sphingosine-1-phosphate (S1P) receptor-1to exit lymphoid organs, but the source(s) of extracellularS1P and whether S1P directly promotes egress are unknown. Byusing mice in which the two kinases that generate S1P were conditionallyablated, we find that plasma S1P is mainly hematopoietic inorigin, with erythrocytes a major contributor, whereas lymphS1P is from a distinct radiation-resistant source. Lymphocyteegress from thymus and secondary lymphoid organs was markedlyreduced in kinase-deficient mice. Restoration of S1P to plasmarescued egress to blood but not lymph, and the rescue requiredlymphocyte expression of S1P-receptor-1. Thus, separate sourcesprovide S1P to plasma and lymph to help lymphocytes exit thelow-S1P environment of lymphoid organs. Disruption of compartmentalizedS1P signaling is a plausible mechanism by which S1P-receptor-1agonists function as immunosuppressives.
1 Cardiovascular Research Institute, University of California, San Francisco, 600 16th Street S472D, San Francisco, CA 941432240, USA. 2 Howard Hughes Medical Institute (HHMI) and Department of Microbiology and Immunology, University of California, San Francisco, 513 Parnassus Avenue, San Francisco, CA 941430414, USA. 3 Drug Studies Unit, Department of Biopharmaceutical Sciences, University of California, San Francisco, 296 Lawrence Street, South San Francisco, CA 94080, USA.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: Shaun.Coughlin{at}ucsf.edu (S.R.C.); Jason.Cyster{at}ucsf.edu (J.G.C.)
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