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• W2170817100 abstract "Cross-linking the high affinity IgE receptor, Fc epsilon R1, with multivalent antigen induces inositol 1,4,5-trisphosphate [Ins(1,4,5)P3]-dependent release of intracellular Ca2+ stores, Ca2+ influx, and secretion of inflammatory mediators from RBL-2H3 mast cells. Here, fluorescence ratio imaging microscopy was used to characterize the antigen-induced Ca2+ responses of single fura-2-loaded RBL-2H3 cells in the presence and absence of extracellular Ca2+ (Ca2+o). As antigen concentration increases toward the optimum for secretion, more cells show a Ca2+ spike or an abrupt increase in [Ca2+]i and the lag time to onset of the response decreases both in the presence and the absence of Ca2+o. When Ca2+o is absent, fewer cells respond to low antigen and the lag times to response are longer than those measured in the presence of Ca2+o, indicating that Ca2+o contributes to Ca2+ stores release. Ins(1,4,5)P3 production is not impaired by the removal of Ca2+o, suggesting that extracellular Ca2+ influences Ca2+ stores release via an effect on the Ins(1,4,5)P3 receptor. Stimulation with low concentrations of antigen can lead, only in the presence of Ca2+o, to a small, gradual increase in [Ca2+]i before the abrupt spike response that indicates store release. We propose that this small, initial [Ca2+]i increase is due to receptor-activated Ca2+ influx that precedes and may facilitate Ca2+ stores release. A mechanism for capacitative Ca2+ entry also exists in RBL-2H3 cells. Our data suggest that a previously undescribed response to Fc epsilon R1 cross-linking, inhibition of Ca2+ stores refilling, may be involved in activating capacitative Ca2+ entry in antigen-stimulated RBL-2H3 cells, thus providing the elevated [Ca2+]i required for optimal secretion. The existence of both capacitative entry and Ca2+ influx that can precede Ca2+ release from intracellular stores suggests that at least two mechanisms of stimulated Ca2+ influx are present in RBL-2H3 cells." @default.
• W2170817100 created "2016-06-24" @default.
• W2170817100 creator A5061151877 @default.
• W2170817100 creator A5080696258 @default.
• W2170817100 date "1995-07-01" @default.
• W2170817100 modified "2023-10-09" @default.
• W2170817100 title "Roles for Ca2+ stores release and two Ca2+ influx pathways in the Fc epsilon R1-activated Ca2+ responses of RBL-2H3 mast cells." @default.
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• W2170817100 doi "https://doi.org/10.1091/mbc.6.7.825" @default.
• W2170817100 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/301243" @default.
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