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© Artur Scherf
Scanning Electron Microscopy of Red Blood Cell infected by Plasmodium falciparum.
Publication : The Journal of allergy and clinical immunology

Downregulation of basophil-derived IL-4 and in vivo T(H)2 IgE responses by serotonin and other organic cation transporter 3 ligands

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The Journal of allergy and clinical immunology - 02 Jun 2011

Schneider E, Machavoine F, Bricard-Rignault R, Levasseur M, Petit-Bertron AF, Gautron S, Ribeil JA, Launay JM, Mecheri S, Côté F, Dy M

Link to Pubmed [PMID] – 21636115

J. Allergy Clin. Immunol. 2011 Oct;128(4):864-871.e2

BACKGROUND: Murine basophils can contribute to the T(H)2 polarization of the immune response by providing rapidly large amounts of IL-4, which suggests that pharmacologic downregulation of this cytokine might provide a strategy to attenuate pathologies associated with excessive production.

OBJECTIVE: We examined a number of physiological and pharmacologic ligands of the organic cation transporter 3 (OCT3), a membrane carrier of biogenic amines, for their inhibitory effect on IL-4 production by basophils, selecting the most efficient compounds for in vivo evaluation in basophil-dependent experimental models.

METHODS: IL-4 production by basophils isolated ex vivo or from bone marrow cultures was assessed in response to various stimuli with or without biogenic monoamines or pharmacologic analogs. Selected compounds were administered in vivo to examine their effect on levels of circulating IgE generated during a basophil-dependent T(H)2 response and on basophil activation in mice receiving IL-33.

RESULTS: We found a drastic decrease in IL-4 production by stimulated basophils on exposure to serotonin (5-hydroxytryptamine [5-HT]) that is taken up by basophils through the specific high-affinity transporters serotonin transporter and the polyspecific, high-capacity organic cation transporter 3 (OCT3; or Slc22a3) but inhibits their function exclusively through the latter. This downregulation is likewise observed in vivo in response to 5-HT and other OCT3 ligands, as well as in human basophils sorted from PMBCs of nonatopic donors.

CONCLUSIONS: We provide evidence for a new means of downregulating IL-4 production by basophils, both in vitro and in vivo, through OCT3 targeted by 5-HT and pharmacologic ligands.

http://www.ncbi.nlm.nih.gov/pubmed/21636115