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- W2023701629 abstract "Besides mast cells and basophils, the high-affinity IgE Fc receptor (FcepsilonRI) is exclusively expressed on certain FcalphaR (IgA Fc receptor)-expressing immune cells such as neutrophils in allergic patients. Transfected rat basophilic leukemia cell line (RBL-2H3) co-expressing FcepsilonRI and FcalphaR was analyzed for effects of simultaneous receptor engagement by their specific antibodies on degranulation and signaling. Whereas supraoptimal FcepsilonRI engagement decreased degranulation, which is known as a bell-shaped dose-response curve, such inhibitory effect was not observed with FcalphaR engagement. However, simultaneous engagement of FcepsilonRI and FcalphaR showed that supraoptimal FcepsilonRI engagement down-regulates FcalphaR-mediated degranulation. This inhibition was associated with extensive phosphorylation of inositol polyphosphate 5'-phosphatase SHIP1 and FcepsilonRIbeta, and reversed by adding actin-depolymerizing drug, latrunculin B. The results suggest an endogenous mechanism by which FcalphaR functionality is down-regulated in an 'allergic environment' where FcepsilonRI is co-expressed and extensively cross-linked on FcalphaR-expressing effector cells." @default.
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- W2023701629 date "2008-10-01" @default.
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- W2023701629 title "Functionality of the IgA Fc receptor (FcαR, CD89) is down-regulated by extensive engagement of FcɛRI" @default.
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- W2023701629 doi "https://doi.org/10.1016/j.clim.2008.07.003" @default.
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