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Phospholipase C-?3 regulates Fc?RI-mediated mast cell activation by recruiting the protein phosphatase SHP-1.


ABSTRACT: Mast cells are major effectors in high-affinity IgE receptor (Fc?RI)-dependent allergic reactions. Here we show that phospholipase C (PLC)-?3 is crucial for Fc?RI-mediated mast cell activation. Plcb3(-/-) mice showed blunted Fc?RI-dependent late-phase, but not acute, anaphylactic responses and airway inflammation. Accordingly, Fc?RI 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-?3 constitutively interacts with Fc?RI, 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-?3- and SHP-1-mediated repression of Lyn activity by dephosphorylation at Tyr396, Fc?RI-mediated phenotypes were similar in Plcb3(-/-) and SHP-1 mutant mast cells. Thus, we have defined a PLC-?3- and SHP-1-mediated signaling pathway for Fc?RI-mediated cytokine production.

SUBMITTER: Xiao W 

PROVIDER: S-EPMC3124618 | BioStudies | 2011-01-01

REPOSITORIES: biostudies

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