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- W2121420563 endingPage "3962" @default.
- W2121420563 startingPage "3954" @default.
- W2121420563 abstract "We previously showed that silver stimulates degranulation and leukotriene (LT) C(4) production in rat basophilic leukemia mast cells and now show that silver induces these events by a mechanism that differs from the FcepsilonRI-mediated response. In common with FcepsilonRI cross-linking, silver induced tyrosine phosphorylation of extracellular signal-regulated kinases and furthermore, PD98059, a specific inhibitor of extracellular signal-regulated kinase kinase dose-dependently inhibited the silver-induced LTC(4) production. In contrast to FcepsilonRI cross-linking, silver had no effect on the production of IL-4 and TNF-alpha, indicating that different mechanisms are involved in the activation by these two stimuli. In line with this, silver had no or only marginal effect on the tyrosine phosphorylation of FcepsilonRIbeta, Lyn, Syk, and linker for activation of T cells, the early and crucial events in FcepsilonRI signaling. Silver induced calcium signals that were involved in the metal-induced degranulation, but not LTC(4) production. Unlike Ag, the silver-induced calcium signals were resistant to the depletion of thapsigargin-sensitive calcium stores and the inhibition of tyrosine kinases and phospholipase Cgamma. These findings indicate that silver activates mast cells by bypassing the early signaling events required for the induction of calcium influx. Our data strongly suggest the existence of an alternative pathway bypassing the early signaling events in mast cell activation and indicate that silver may be useful for analyses of such alternative mechanisms." @default.
- W2121420563 created "2016-06-24" @default.
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- W2121420563 date "2002-10-01" @default.
- W2121420563 modified "2023-09-26" @default.
- W2121420563 title "Silver Activates Calcium Signals in Rat Basophilic Leukemia-2H3 Mast Cells by a Mechanism That Differs from the FcεRI-Activated Response" @default.
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- W2121420563 doi "https://doi.org/10.4049/jimmunol.169.7.3954" @default.
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