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Indian J Exp Biol ; 2014 Jun; 52(6): 589-596
Article Dans Anglais | IMSEAR | ID: sea-153737

Résumé

Mast cells are numerous at anatomical sites close to external environment, virtually at the portals of infection. A few data indicated that these cells express cytoplasmic Toll-like receptors (TLRs) recognizing virus-derived molecules. Accordingly, mast cells could participate in anti-viral defense or/and in viral-related diseases. However, data concerning the influence of viruses on mast cell activity are limited. Thus, the aim of our study was to determine mast cell response to TLR7 ligand, i.e. resiquimod (R848), a synthetic mimic of viral ssRNA. Since mast cells play a central role in allergic reactions the effect of TLR7 agonist was also investigated on FcεRI-dependent mast cell response. Experiments were carried out in vitro on freshly isolated fully mature rat peritoneal mast cells. Mast cells exhibit constitutive TLR7 molecule expression and its up-regulation after the agonist challenge. TLR7-mediated mast cell stimulation resulted in cysteinyl leukotriene (cysLT) and interferon (IFN)-β synthesis, whereas no histamine and CXCL8 secretion was stated. Moreover, mast cell priming with TLR7 ligand caused the reduction in anti-IgE-induced histamine release. The results suggest that ssRNA viruses could directly activate mast cells to alter their phenotype and to release of potent proinflammatory mediators or indirectly modulate IgE-dependent allergic processes.


Sujets)
Animaux , Dégranulation cellulaire/effets des médicaments et des substances chimiques , Cellules cultivées , Femelle , Imidazoles/pharmacologie , Immunoglobuline E/physiologie , Interféron bêta/métabolisme , Leucotriènes/métabolisme , Mastocytes/effets des médicaments et des substances chimiques , Mastocytes/immunologie , Rats , Rat Wistar , Récepteur de type Toll-7/antagonistes et inhibiteurs , Récepteur de type Toll-7/métabolisme
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