title: The sphingosine-1-phosphate receptor agonist FTY720 modulates dendritic cell trafficking in vivo.
abstract: The pro-drug FTY720 is undergoing phase III clinical trials for prevention of allograft rejection. After phosphorylation, FTY720 targets the G protein-coupled-sphingosine-1-phosphate receptor 1 (S1PR1) on lymphocytes, thereby inhibiting their egress from lymphoid organs and their recirculation to inflammatory sites. Potential effects on dendritic cell (DC) trafficking have not been evaluated. Here, we demonstrate the expression of all five S1PR subtypes (S1PR1-5) by murine DCs. Administration of FTY720 to C57BL/10 mice markedly reduced circulating T and B lymphocytes within 24 h, but not blood-borne DCs, which were enhanced significantly for up to 96 h, while DCs in lymph nodes and spleen were reduced. Numbers of adoptively transferred, fluorochrome-labeled syngeneic or allogeneic DCs in blood were increased significantly in FTY720-treated animals, while donor-derived DCs and allostimulatory activity for host naïve T cells within the spleen were reduced. Administration of the selective S1PR1 agonist SEW2871 significantly enhanced circulating DC numbers. Flow analysis revealed that CD11b, CD31/PECAM-1, CD54/ICAM-1 and CCR7 expression on blood-borne DCs was downregulated following FTY720 administration. Transendothelial migration of FTY720-P-treated immature DCs to the CCR7 ligand CCL19 was reduced. These novel data suggest that modulation of DC trafficking by FTY720 may contribute to its immunosuppressive effects.
authors.affiliation: Thomas E. Starzl Transplantation Institute and Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
authors.forename: Yuk Yuen
authors.initials: YY
authors.lastname: Lan
authors.forename: An
authors.initials: A
authors.lastname: De Creus
authors.forename: Bridget L
authors.initials: BL
authors.lastname: Colvin
authors.forename: Masanori
authors.initials: M
authors.lastname: Abe
authors.forename: Volker
authors.initials: V
authors.lastname: Brinkmann
authors.forename: P Toby H
authors.initials: PT
authors.lastname: Coates
authors.forename: Angus W
authors.initials: AW
authors.lastname: Thomson
mesh_terms: D000818:Animals; D017209:Apoptosis; D001402:B-Lymphocytes / Q000187:drug effects / Q000276:immunology; D015815:Cell Adhesion Molecules / Q000502:physiology; D002454:Cell Differentiation; D017931:DNA Primers; D003713:Dendritic Cells / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D000068876:Fingolimod Hydrochloride; D007166:Immunosuppressive Agents / Q000494:pharmacology*; D008212:Lymphocyte Depletion; D051379:Mice; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D010069:Oxadiazoles / Q000494:pharmacology; D016133:Polymerase Chain Reaction; D011409:Propylene Glycols / Q000494:pharmacology*; D049349:Receptors, Lysosphingolipid / Q000819:agonists* / Q000235:genetics; D013110:Sphingosine / Q000031:analogs & derivatives; D013601:T-Lymphocytes / Q000187:drug effects / Q000276:immunology; D013876:Thiophenes / Q000494:pharmacology
chemical_list: D015815:Cell Adhesion Molecules; D017931:DNA Primers; D007166:Immunosuppressive Agents; D010069:Oxadiazoles; D011409:Propylene Glycols; D049349:Receptors, Lysosphingolipid; C503964:SEW2871; D013876:Thiophenes; D000068876:Fingolimod Hydrochloride; D013110:Sphingosine