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- W4313333784 endingPage "3235" @default.
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- W4313333784 abstract "Abstract Multivalent DNP-BSA is commonly used to cross-link anti-DNP IgE bound to FcεRI to stimulate cellular responses, although key features of the binding process are unknown. Fluorescence quenching can be used to study the kinetics of DNP-BSA binding to FITC-IgE. We observe that DNP-BSA binds more slowly to IgE than does an equimolar amount of a monovalent DNP ligand, suggesting that the average effective number of DNP groups per BSA is less than one. The binding data are well described by a transient hapten exposure model in which most of the DNP groups are unavailable for binding but have some probability of becoming exposed and available for binding during the time of the binding measurement. Additional experiments indicate that, for suboptimal to optimal concentrations of DNP-BSA, most of the FITC fluorescence quenching on the cell surface is due to cross-linking events. With these concentrations at 15°C, the kinetics of FITC fluorescence quenching by DNP-BSA correlates with the kinetics of DNP-BSA-stimulated tyrosine phosphorylation of FcεRI. At 35°C, the phosphorylation kinetics are biphasic during the time period in which cross-linking continues to increase. Our results establish a quantitative relationship between the timecourse for cross-linking by multivalent Ag and FcεRI-mediated signaling, and they provide the means to predict the kinetics of cross-linking under a wide variety of conditions." @default.
- W4313333784 created "2023-01-06" @default.
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- W4313333784 date "1998-04-01" @default.
- W4313333784 modified "2023-10-16" @default.
- W4313333784 title "Kinetics of Multivalent Antigen DNP-BSA Binding to IgE-FcεRI in Relationship to the Stimulated Tyrosine Phosphorylation of FcεRI" @default.
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- W4313333784 doi "https://doi.org/10.4049/jimmunol.160.7.3225" @default.
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