The lysophospholipid growth factor sphingosine 1-phosphate (S1P) is derived from macrophages, mast cells and platelets, and regulates lymphocyte migration, homing and other functions through the T and B cell-predominant S1P1 G protein-coupled receptor (R). The major effect of the 0.3 ?M to 3 ?M S1P in plasma, lymph and inflamed tissues transduced by S1P1 Rs is inhibition of lymphocyte chemotactic responses to chemokines. Rat anti-S1P1 R monoclonal antibodies and small heterocyclic compounds inhibitory for S1P1 Rs, but not S1P4 Rs, suppress all T cell migration effects of S1P. Non-suppressible overexpression of S1P1 Rs selectively by T cells in a transgenic mouse (TG) and loss of T cell S1P1 Rs in a conditional knock-out mouse (KO) both alter T cell traffic, T cell effector responses, and isotype-specific antibody production. The newly-developed anti-S1P1 R antibodies and pharmacological probes, and the TG and KO mouse models now will be applied in studies designed to: 1. Elucidate the nature and control of post-translational modifications of lymphocyte S1P1 Rs that affect their expression and functions, 2. Characterize the transcriptional mechanisms and biochemical pathways used by the S1P- S1P1 R axis to increase the Th2/Th1 cytokine and activity ratios sufficiently to suppress delayed-type hypersensitivity and promote allergic reactions, 3. Define roles of the S1P- S1P1 R axis in controlling tissue-specific distribution and traffic of T cells, including rolling-adhesion on endothelial surfaces, tissue homing at distinct stages of differentiation, interactions with other immune cells in intact lymph nodes by 2-photon microscopy, and compartmental responses to antigen, and 4. Evaluate involvement of the S1P- S1P1 R axis in central nervous system influx and pathogenetic reactions of T cells in mouse experimental autoimmune encephalitis (EAE). Suppression of T cell S1P1 R expression or signaling is predicted to inhibit T cell entry into sites of transplanted organ rejection and autoimmunity with attendant therapeutic benefits and without compromise of host defense against microbial infections. ? ? ? ?

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL031809-25
Application #
7425083
Study Section
Cellular and Molecular Immunology - B (CMI)
Program Officer
Reynolds, Herbert Y
Project Start
1983-07-01
Project End
2010-05-31
Budget Start
2008-06-01
Budget End
2010-05-31
Support Year
25
Fiscal Year
2008
Total Cost
$323,210
Indirect Cost
Name
University of California San Francisco
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
094878337
City
San Francisco
State
CA
Country
United States
Zip Code
94143
Huang, Mei-Chuan; Patel, Kalpesh; Taub, Dennis D et al. (2010) Human CD4- 8- T cells are a distinctive immunoregulatory subset. FASEB J 24:2558-66
Goetzl, Edward J; Huang, Mei-Chuan; Kon, Junko et al. (2010) Gender specificity of altered human immune cytokine profiles in aging. FASEB J 24:3580-9
Yeh, Che-Chung; Li, Hongzhe; Malhotra, Deepak et al. (2009) Sphingolipid signaling and treatment during remodeling of the uninfarcted ventricular wall after myocardial infarction. Am J Physiol Heart Circ Physiol 296:H1193-9
Liao, Jia-Jun; Huang, Mei-Chuan; Fast, Katharine et al. (2009) Immunosuppressive human anti-lymphocyte autoantibodies specific for the type 1 sphingosine 1-phosphate receptor. FASEB J 23:1786-96
Goetzl, Edward J; Liao, Jia-Jun; Huang, Mei-Chuan (2008) Regulation of the roles of sphingosine 1-phosphate and its type 1 G protein-coupled receptor in T cell immunity and autoimmunity. Biochim Biophys Acta 1781:503-7
Huang, Mei-Chuan; Liao, Jia-Jun; Bonasera, Stephen et al. (2008) Nuclear factor-kappaB-dependent reversal of aging-induced alterations in T cell cytokines. FASEB J 22:2142-50
Liao, Jia-Jun; Huang, Mei-Chuan; Goetzl, Edward J (2007) Cutting edge: Alternative signaling of Th17 cell development by sphingosine 1-phosphate. J Immunol 178:5425-8
Goetzl, Edward J; Wang, Wengang; McGiffert, Christine et al. (2007) Sphingosine 1-phosphate as an intracellular messenger and extracellular mediator in immunity. Acta Paediatr Suppl 96:49-52
Wang, Wengang; Huang, Mei-Chuan; Goetzl, Edward J (2007) Type 1 sphingosine 1-phosphate G protein-coupled receptor (S1P1) mediation of enhanced IL-4 generation by CD4 T cells from S1P1 transgenic mice. J Immunol 178:4885-90
Huang, Mei-Chuan; Watson, Susan R; Liao, Jia-Jun et al. (2007) Th17 augmentation in OTII TCR plus T cell-selective type 1 sphingosine 1-phosphate receptor double transgenic mice. J Immunol 178:6806-13

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