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- W4313335099 abstract "Abstract We investigated the effects of IgE versus IL-4 on FcεRI surface expression in differentiated human mast cells derived in vitro from umbilical cord blood mononuclear cells. We found that IgE (at 5 μg/ml) much more strikingly enhanced surface expression of FcεRI than did IL-4 (at 0.1–100 ng/ml); similar results were also obtained with differentiated mouse mast cells. However, IL-4 acted synergistically with IgE to enhance FcεRI expression in these umbilical cord blood-derived human mast cells, as well as in mouse peritoneal mast cells derived from IL-4−/− or IL-4+/+ mice. We also found that: 1) IgE-dependent enhancement of FcεRI expression was associated with a significantly enhanced ability of these human mast cells to secrete histamine, PGD2, and leukotriene C4 upon subsequent passive sensitization with IgE and challenge with anti-IgE; 2) preincubation with IL-4 enhanced IgE-dependent mediator secretion in these cells even in the absence of significant effects on FcεRI surface expression; 3) when used together with IgE, IL-4 enhanced IgE-dependent mediator secretion in human mast cells to levels greater than those observed in cells that had been preincubated with IgE alone; and 4) batches of human mast cells generated in vitro from umbilical cord blood cells derived from different donors exhibited differences in the magnitude and pattern of histamine and lipid mediator release in response to anti-IgE challenge, both under baseline conditions and after preincubation with IgE and/or IL-4." @default.
- W4313335099 created "2023-01-06" @default.
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- W4313335099 date "1999-05-01" @default.
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- W4313335099 title "IgE Enhances Fcε Receptor I Expression and IgE-Dependent Release of Histamine and Lipid Mediators from Human Umbilical Cord Blood-Derived Mast Cells: Synergistic Effect of IL-4 and IgE on Human Mast Cell Fcε Receptor I Expression and Mediator Release" @default.
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- W4313335099 doi "https://doi.org/10.4049/jimmunol.162.9.5455" @default.
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