FTY720 stimulates multidrug transporter– and cysteinyl leukotriene–dependent T cell chemotaxis to lymph nodes

Honig, S.; Fu, Shuang; Mao, Xia; Yopp, Adam C.; Gunn, Michael D.; Randolph, Gwendalyn J.; Bromberg, Jonathan S.

doi:10.1172/jci200316200

Cited by 120 publications

(83 citation statements)

References 46 publications

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“…Alternatively, sphingosine 1-phosphate may regulate the responses of thymocytes to thymic chemokines important for retention or emigration. Sphingosine 1-phosphate has been demonstrated to regulate the chemotactic responses of T-cells to chemokines in a concentration-dependent manner (17,35).…”

Section: Discussionmentioning

confidence: 99%

Expression of the Sphingosine 1-Phosphate Receptor, S1P1, on T-cells Controls Thymic Emigration

Allende

Dreier

Mandala

et al. 2004

Journal of Biological Chemistry

415

381

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S1P 1 is a widely distributed G protein-coupled receptor whose ligand, sphingosine 1-phosphate, is present in high concentrations in the blood. The sphingosine 1-phosphate receptor-signaling pathway is believed to have potent effects on cell trafficking in the immune system. To determine the precise role of the S1P 1 receptor on T-cells, we established a T-cell-specific S1P 1 knock-out mouse. The mutant mice showed a block in the egress of mature T-cells into the periphery. The expression of the S1P 1 receptor was up-regulated in mature thymocytes, and its deletion altered the chemotactic responses of thymocytes to sphingosine 1-phosphate. The results indicated that the expression of the S1P 1 receptor on T-cells controls their exit from the thymus and entry into the blood and, thus, has a central role in regulating the numbers of peripheral T-cells.Sphingolipids are important signaling molecules in a variety of biologic contexts (1-3). Sphingosine 1-phosphate, in one paradigm, binds to members of a family of G protein-coupled receptors (S1P 1-15 ) triggering diverse effects including proliferation, survival, migration, morphogenesis, adhesion molecule expression, and cytoskeletal changes (4 -8).S1P 1 /Edg 1 , the first of these receptors described (9, 10), couples to a G i pathway. During embryonic development, the S1P 1 receptor is highly expressed in the vascular system. Gene disruption in mice has demonstrated an essential function of the S1P 1 receptor in endothelial cells for the formation of a stable vascular network (11,12).The S1P 1 receptor is widely expressed in the adult, in particular in endothelial cells, the brain, and the heart, and also in the cells of the immune system (13, 14). S1P 1 and S1P 4 receptors have been detected in T-lymphocytes (15-17). Stimulation of receptor signaling has been found to mediate and regulate cell migration and suppress proliferation and cytokine production (17, 18). Recently, S1P 1 receptors have also been implicated in lymphocyte trafficking and homing as the result of studies using FTY720, a potent immunosuppressive agent. FTY720, a sphingosine analogue, is phosphorylated by sphingosine kinase type I and more efficiently by sphingosine kinase type II (19 -21) and functions as an agonist ligand for S1P 1 , S1P 3 , S1P 4 , and S1P 5 receptors (19,22). FTY720 causes lymphopenia through sequestration of circulating lymphocytes within lymph nodes and Peyer's patches (19,(22)(23)(24) and also blocks the egress of T-cells from the thymus (25, 26). However, it is not known at which S1P receptor and cell type FTY720 exerts its effects.To begin to address the physiologic function of the S1P 1 receptor and sphingosine 1-phosphate signaling in T-cells, we have generated a T-cell-specific mouse knock-out of the S1P 1 receptor using the Cre/loxP system. Our results with these mice reveal a crucial role for the S1P 1 receptor in the egress of mature T-cells from the thymus into the circulation. EXPERIMENTAL PROCEDURESGeneration of the S1P 1 loxP/loxP Lck-Cre Mice-We previously g...

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Section: Discussionmentioning

confidence: 99%

Expression of the Sphingosine 1-Phosphate Receptor, S1P1, on T-cells Controls Thymic Emigration

Allende

Dreier

Mandala

et al. 2004

Journal of Biological Chemistry

415

381

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“…Although S1P is secreted by several types of cells in response to various agonists (55), little is known about the mechanisms of its release. The ATP-binding cassette transporter ABCB1 (previously called MDR-1 and P-glycoprotein), which catalyzes movement of platelet-activating factor in addition to amphiphilic drugs from the cytosol to the extracellular environment (56), has recently been implicated in transport of S1P out of cells (57). Transport of S1P out of cells is an important issue to resolve because it impinges on S1P actions at the cell surface and possibly inside cells.…”

Section: Spp-1 Expression Does Not Abrogate Egf-induced Tyrosine Phosmentioning

confidence: 99%

Role of Sphingosine-1-phosphate Phosphatase 1 in Epidermal Growth Factor-induced Chemotaxis

Stunff

Mikami

Giussani

et al. 2004

Journal of Biological Chemistry

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Sphingosine-1-phosphate (S1P) is the ligand for a family of specific G protein-coupled receptors that regulate a wide variety of cellular functions, including cytoskeletal rearrangements and cell motility. Because of the pivotal role of S1P, its levels are low and tightly regulated in a spatial-temporal manner through its synthesis catalyzed by sphingosine kinases and degradation by an S1P lyase and specific S1P phosphatases (SPP). Surprisingly, down-regulation of SPP-1 enhanced migration toward epidermal growth factor (EGF); conversely, overexpression of SPP-1, which is localized in the endoplasmic reticulum, attenuated migration toward EGF. To determine whether the inhibitory effect on EGF-induced migration was because of decreased S1P or increased ceramide as a consequence of acylation of increased sphingosine by ceramide synthase, we used fumonisin B1, a specific inhibitor of ceramide synthase. Although fumonisin B1 blocked ceramide production and increased sphingosine, it did not reverse the negative effect of SPP-1 expression on EGF-or S1P-induced chemotaxis. EGF activated the epidermal growth factor receptor to the same extent in SPP-1-expressing cells, yet ERK1/2 activation was impaired. In agreement, PD98059, an inhibitor of the ERK-activating enzyme MEK, decreased EGF-stimulated migration. We next examined the possibility that intracellularly generated S1P might be involved in activating a G protein-coupled S1P receptor important for EGF-directed migration. Treatment with pertussis toxin to inactivate G␣ i suppressed EGF-induced migration. Moreover, expression of regulator of G protein signaling 3, which inhibits S1P receptor signaling and completely prevented ERK1/2 activation mediated by S1P receptors, not only reduced migration toward S1P but also markedly reduced migration toward EGF. Collectively, these results suggest that metabolism of S1P by SPP-1 is important for EGF-directed cell migration.The bioactive sphingolipid, sphingosine-1-phosphate (S1P), 1 is a ligand for a family of five specific G protein-coupled receptors (S1P 1 , S1P 2 , S1P 3 , S1P 4 , and S1P 5 ) (1) that are coupled to various G proteins. These receptors regulate diverse cellular processes and have been implicated in cytoskeletal rearrangement and regulation of cell movement (2, 3). The founding member of this receptor family, S1P 1 , couples to a G i pathway (4), and its gene disruption in mice demonstrated an essential function for vascular maturation (5). More recently, several studies have established that S1P 1 is also essential for lymphocyte recirculation and that it regulates egress from peripheral lymphoid organs (6, 7). In addition to its extracellular functions, S1P acts intracellularly to regulate cell survival (8), yet its direct targets have not yet been elucidated.As with other potent lipid mediators, levels of S1P are low and tightly regulated in a spatial-temporal manner. Sphingosine kinase (SphK) catalyzes the synthesis of S1P (2), which can be irreversibly degraded by S1P lyase (9 -11) and reversibly conver...

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“…Moreover, they had no effects on the levels of cell-associated S1P (data not shown). To assess the functional activity of these inhibitors, cells were loaded with a fluorescent transport substrate DiOC 2 , which is transported by ABCB1 more efficiently than by other ABC transporters (22), and fluorescence secreted from the cells was measured (23). There was increased fluorescence at 37°C, indicating transport of the dye from the intracellular to the extracellular compartment, whereas cells held at 4°C exported DiOC 2 to a much lesser extent.…”

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confidence: 99%

Role of ABCC1 in export of sphingosine-1-phosphate from mast cells

Mitra

Oskeritzian

Payne

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

381

329

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Mast cells play a pivotal role in inflammatory and immediate-type allergic reactions by secreting a variety of potent inflammatory mediators, including sphingosine-1-phosphate (S1P). However, it is not known how S1P is released from cells. Here, we report that S1P is exported from mast cells independently of their degranulation and demonstrate that it is mediated by ATP binding cassette (ABC) transporters. Constitutive and antigen-stimulated S1P release was inhibited by MK571, an inhibitor of ABCC1 (MRP1), but not by inhibitors of ABCB1 (MDR-1, P-glycoprotein). Moreover, downregulation of ABCC1 with small interfering RNA, which decreased its cell surface expression, markedly reduced S1P export from both rat RBL-2H3 and human LAD2 mast cells. Transport of S1P by ABCC1 influenced migration of mast cells toward antigen but not degranulation. These findings have important implications for S1P functions in mast cell-mediated immune responses.secretion ͉ sphingolipids ͉ multidrug resistance ͉ allergic responses ͉ sphingosine kinase S phingosine-1-phosphate (S1P) is a pleiotropic lipid mediator that has been implicated in cancer, immunity, and allergy (1-4). S1P is a ligand for a family of five specific G protein-coupled receptors, designated S1P 1-5 (collectively referred to as S1PRs) (5), through which it regulates many different biological responses, including growth, survival, differentiation, cytoskeleton rearrangements, motility, angiogenesis, vascular maturation, lymphocyte trafficking, and mast cell functions (reviewed in refs. 1-3, 5, and 6). Moreover, like its precursors, sphingosine (Sph) and ceramide, S1P may also have intracellular functions (1, 2, 7). S1P is produced in cells by phosphorylation of Sph, the backbone of all sphingolipids, catalyzed by two closely related Sph kinase (SphK) isoenzymes. SphK1 activity is enhanced by numerous external stimuli, including growth factors, ligands for G protein-coupled receptors, and proinflammatory cytokines, and by cross-linking of Ig receptors (reviewed in refs. 1 and 6). To date, only EGF (8) and cross-linking of Ig receptors (4) have been shown to stimulate SphK2.Although S1P secretion has been demonstrated in only a few types of cells (platelets, astroglial cells, and mast cells) activation of SphK1 involves its translocation to the plasma membrane where its substrate Sph resides (9 -11). Increased S1P formation, in turn, activates S1P receptors on the same and͞or neighboring cells in an autocrine or paracrine manner. It has been demonstrated that this type of ''inside-out'' signaling by S1P is critical for migratory responses of fibroblasts and smooth muscle cells toward PDGF (9, 12) and human breast cancer cells toward EGF (8). Similarly, S1P secreted by mast cells is important for migration of mast cells toward antigen (Ag) and might be involved in the movement of mast cells to sites of inf lammation (13). In addition, S1P provokes human airway smooth muscle contraction and may promote inf lammation and airway remodeling in asthma (14). Because S1P's level...

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FTY720 stimulates multidrug transporter– and cysteinyl leukotriene–dependent T cell chemotaxis to lymph nodes

Cited by 120 publications

References 46 publications

Expression of the Sphingosine 1-Phosphate Receptor, S1P1, on T-cells Controls Thymic Emigration

Expression of the Sphingosine 1-Phosphate Receptor, S1P1, on T-cells Controls Thymic Emigration

Role of Sphingosine-1-phosphate Phosphatase 1 in Epidermal Growth Factor-induced Chemotaxis

Role of ABCC1 in export of sphingosine-1-phosphate from mast cells

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