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- W4313333687 abstract "Abstract Fcγ receptors (FcγRII) on B lymphocytes negatively regulate B cell receptor (BCR)-dependent activation upon cross-linking of the two receptors. The mechanism reflects the ability of the FcγRII cytoplasmic tail to recruit specific phosphatases that inactivate elements of the BCR-signaling cascade. We now show that cross-linking also blocks the processing and presentation of BCR-bound Ag. This occurs because the FcγRII isoform typically expressed by B cells (FcγRII-B1) is incompetent for endocytosis. When cross-linked, FcγRII-B1 acts as a dominant negative inhibitor of BCR endocytosis. In contrast, cross-linking of endocytosis-competent FcγRII isoforms did not inhibit endocytosis or processing of BCR-bound Ag. Thus, FcγRII-B1 acts not only to prevent B cell activation under conditions of Ab excess, but also to prevent clonotypic T cell activation by inhibiting the ability of B cells to generate specific MHC class II-bound TCR ligands." @default.
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- W4313333687 date "1998-09-01" @default.
- W4313333687 modified "2023-10-11" @default.
- W4313333687 title "Cutting Edge: FcγRII-B1 Regulates the Presentation of B Cell Receptor-Bound Antigens" @default.
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- W4313333687 doi "https://doi.org/10.4049/jimmunol.161.5.2079" @default.
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