The sphingosine-1-phosphate receptor-1 antagonist, W146, causes early and short-lasting peripheral blood lymphopenia in mice

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dc.contributor.authorTarrason, G.
dc.contributor.authorAuli, M.
dc.contributor.authorMustafa, S.
dc.contributor.authorDolgachev, V.
dc.contributor.authorDomenech, M.
dc.contributor.authorPrats, N.
dc.contributor.authorDominguez, M.
dc.contributor.authorLopez, R.
dc.contributor.authorAguilar, N.
dc.contributor.authorCalbert, M.
dc.contributor.authorPont, M.
dc.contributor.authorMilligan, G.
dc.contributor.authorKunkel, S.
dc.contributor.authorGodessart, N.
dc.date.issued2011
dc.description.abstractAgonists of the sphingosine-1-phosphate (S1P) receptors, like fingolimod (FTY720), are a novel class of immunomodulators. Administration of these compounds prevents the egress of lymphocytes from primary and secondary lymphoid organs causing peripheral blood lymphopenia. Although it is well established that lymphopenia is mediated by S1P receptor type 1 (S1P1), the exact mechanism is still controversial. The most favored hypothesis states that S1P1 agonists cause internalization and loss of the cell surface receptor on lymphocytes, preventing them to respond to S1P. Hence, S1P1 agonists would behave in vivo as functional antagonists of the receptor. For this hypothesis to be valid, a true S1P1 antagonist should also induce lymphopenia. However, it has been reported that S1P1 antagonists fail to show this effect, arguing against the concept. Our study demonstrates that a S1P1 antagonist, W146, induces a significant but transient blood lymphopenia in mice and a parallel increase in CD4+ and CD8+ lymphocytes in lymph nodes. Treatment with W146 also causes the accumulation of mature T cells in the medulla of the thymus and moreover, it induces lung edema. We show that both the S1P1 antagonist and a S1P1 agonist cause lymphopenia in vivo in spite of their different effects on receptor expression in vitro. Although the antagonist purely blocks the receptor and the agonist causes its disappearance from the cell surface, the response to the endogenous ligand is prevented in both cases. Our results support the hypothesis that lymphopenia evoked by S1P1 agonists is due to functional antagonism of S1P1 in lymphocytes.
dc.description.statementofresponsibilityGema Tarrasón, Mariona Aulí, Sanam Mustafa, Vladislav Dolgachev, Maria Teresa Domènech, Neus Prats, María Domínguez, Rosa López, Nuria Aguilar, Marta Calbet, Mercè Pont, Graeme Milligan, Steven L. Kunkel, Nuria Godessart
dc.identifier.citationInternational Immunopharmacology, 2011; 11(1135):1773-1779
dc.identifier.doi10.1016/j.intimp.2011.07.004
dc.identifier.issn1567-5769
dc.identifier.issn1878-1705
dc.identifier.orcidMustafa, S. [0000-0002-8677-5151]
dc.identifier.urihttp://hdl.handle.net/2440/84763
dc.language.isoen
dc.publisherElsevier
dc.rights© 2011 Elsevier B.V. All rights reserved.
dc.source.urihttps://doi.org/10.1016/j.intimp.2011.07.004
dc.subjectSphingosine-1-phosphate receptors; Lymphocytes; Lymph nodes; Lymphopenia; W146; S1P1 agonists
dc.titleThe sphingosine-1-phosphate receptor-1 antagonist, W146, causes early and short-lasting peripheral blood lymphopenia in mice
dc.typeJournal article
pubs.publication-statusPublished

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