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FTY720-Enhanced T Cell Homing Is Dependent on CCR2, CCR5, CCR7, and CXCR4: Evidence for Distinct Chemokine Compartments¹

Adam C. Yopp^*, Shuang Fu^*, Shaun M. Honig^*, Gwendalyn J. Randolph^*, Yaozhong Ding^*, Nancy R. Krieger^*, and Jonathan S. Bromberg^2,*,

^* Carl C. Icahn Center for Gene Therapy and Molecular Medicine, and Recanti/Miller Transplantation Institute, Mount Sinai School of Medicine, New York, NY 10029

FTY720 stimulates CCR7-driven T cell homing to peripheral lymph nodes (LN) by direct activation of sphingosine 1-phosphate receptors, along with the participation of multidrug transporters, 5-lipoxygenase, and G protein-coupled receptors for chemokines. In this study, we demonstrate that FTY720 also directly stimulates in vitro T cell chemotaxis to CCR2-CCL2, but not to a variety of other chemokines, including CCR5-CCL3/4/5 and CXCR4-CXCL12. FTY720 influences CCR2-CCL2-driven migration through activation of the multidrug transporters, Abcb1 and Abcc1, and through 5-lipoxygenase activity. In vivo administration of FTY720 induces chemokine-dependent migration of T cells in the thymus, peripheral blood, LN, and spleen. The CCR7 and CCR2 chemokine ligands are required for both T cell sequestration in LN and thymic T cell egress following FTY720 administration. Furthermore, FTY720 administration uncovers a requirement for CXCR4 ligands for LN homing, but not for thymic egress, and CCR5 for thymic egress, but not LN homing. FTY720-driven splenic and peripheral blood T cell egress are both independent of CCR2, CCR5, CCR7, or CXCR4. These results indicate that FTY720- and sphingosine 1-phosphate receptor-stimulated T cell migration are dependent on the restricted usage of chemokine receptor-ligand pairs within discrete anatomic compartments.

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