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- W1556442394 abstract "Abstract Cross-linking of Fc receptors for IgA, FcR (CD89), on monocytes/macrophages is known to enhance phagocytic activity and generation of oxygen free radicals. We provide evidence here that the FcR signals through the γ subunit of FcɛRI in U937 cells differentiated with interferon γ (IFNγ). Our results provide the first evidence that FcR-mediated signals modulate a multimolecular adaptor protein complex containing Grb2, Shc, SHIP, CrkL, Cbl, and SLP-76. Cross-linking of FcRI using anti-FcRI induces the phosphorylation of the γ subunit as detected by mobility retardation on sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). Stimulation of FcRI induced the tyrosine phosphorylation of Shc and increased the association of Grb2 with Shc and CrkL. Grb2 associates constitutively with Sos, and the latter undergoes mobility shift upon FcRI stimulation. The complex adapter proteins, Cbl and SLP-76, are physically associated in myeloid cells and both proteins undergo tyrosine phosphorylation upon FcR stimulation. These data indicate that the stimulation of FcR results in the modulation of adaptor complexes containing tyrosine-phosphorylated Cbl, Shc, SHIP, Grb2, and Crkl. Experiments performed with the Src kinase inhibitor, PP1, provide the first evidence that Src kinase activation is required for FcRI-induced production of superoxide anions and provide insight into the mechanism for FcR-mediated activation of downstream oxidant signaling in myeloid cells." @default.
- W1556442394 created "2016-06-24" @default.
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- W1556442394 date "1999-09-15" @default.
- W1556442394 modified "2023-10-13" @default.
- W1556442394 title "Role of Src in the Modulation of Multiple Adaptor Proteins in FcRI Oxidant Signaling" @default.
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- W1556442394 doi "https://doi.org/10.1182/blood.v94.6.2112" @default.
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