| Literature DB >> 21683628 |
Wenbin Xiao1, Jun-Ichi Kashiwakura, Hong Hong, Hiroki Yasudo, Tomoaki Ando, Mari Maeda-Yamamoto, Dianqing Wu, Yuko Kawakami, Toshiaki Kawakami.
Abstract
Mast cells are major effectors in high-affinity IgE receptor (FcɛRI)-dependent allergic reactions. Here we show that phospholipase C (PLC)-β3 is crucial for FcɛRI-mediated mast cell activation. Plcb3(-/-) mice showed blunted FcɛRI-dependent late-phase, but not acute, anaphylactic responses and airway inflammation. Accordingly, FcɛRI stimulation of Plcb3(-/-) mast cells exhibited reduced cytokine production but normal degranulation. Reduced cytokine production in Plcb3(-/-) cells could be accounted for by increased activity of the negative regulatory Src family kinase Lyn and reduced activities of the positive regulatory protein kinases MAPKs. Mechanistically, PLC-β3 constitutively interacts with FcɛRI, Lyn, and SHP-1 (protein phosphatase). SHP-1 probably recognizes its substrates Lyn and MAPKs via the recently described kinase tyrosine-based inhibitory motif, KTIM. Consistent with PLC-β3- and SHP-1-mediated repression of Lyn activity by dephosphorylation at Tyr396, FcɛRI-mediated phenotypes were similar in Plcb3(-/-) and SHP-1 mutant mast cells. Thus, we have defined a PLC-β3- and SHP-1-mediated signaling pathway for FcɛRI-mediated cytokine production.Entities:
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Year: 2011 PMID: 21683628 PMCID: PMC3124618 DOI: 10.1016/j.immuni.2011.04.010
Source DB: PubMed Journal: Immunity ISSN: 1074-7613 Impact factor: 31.745