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• W2136014098 abstract "The tumor promoter thapsigargin releases Ca2+ from intracellular stores by specific inhibition of microsomal Ca-ATPase activity without inositol phosphate formation. Recent studies of the actions of thapsigargin support the concept that the level of Ca2+ within the inositol (1,4,5)-trisphosphate (IP3)-sensitive intracellular pool regulates the Ca2+ permeability of the plasma membrane. We examined the effects of thapsigargin on intracellular Ca2+ concentration ([Ca2+]i) in single rat parotid cells using digital fluorescence microscopy. In the absence of extracellular Ca2+ (Ca2+o), thapsigargin transiently increased [Ca2+]i. Following the thapsigargin-induced [Ca2+]i transient, carbachol in the continued absence of Ca2+o was unable to raise [Ca2+]i, indicating that thapsigargin mobilizes Ca2+ from the IP3-sensitive store. In the converse experiment, carbachol prevented a rise of [Ca2+]i by thapsigargin, suggesting that the IP3- and thapsigargin-sensitive Ca2+ pools are the same. Depletion of Ca2+ from the IP3-sensitive pool by thapsigargin enhanced plasma membrane Ca2+ permeability. Thapsigargin triggered sustained Ca2+ oscillations in Ca2(+)-containing medium which are highly reminiscent of agonist-induced oscillations in these cells. Carbachol addition rapidly raised IP3 levels during oscillations triggered by thapsigargin but did not elevate [Ca2+]i, indicating that the IP3-sensitive pool remains continuously depleted during [Ca2+]i fluctuations. The results from this study rule out the involvement of the IP3-sensitive pool in the mechanisms involved in thapsigargin-induced (and by analogy, agonist-induced) oscillations in parotid cells." @default.
• W2136014098 created "2016-06-24" @default.
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• W2136014098 date "1991-02-01" @default.
• W2136014098 modified "2023-10-16" @default.
• W2136014098 title "Activation of calcium oscillations by thapsigargin in parotid acinar cells." @default.
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• W2136014098 doi "https://doi.org/10.1016/s0021-9258(18)49914-0" @default.
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