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- W2005026579 abstract "Muscarinic receptor activation of phosphoinositide phospholipase C (PLC) has been examined in rat cerebellar granule cells under conditions that modify intracellular Ca2+ stores. Exposure of cells to medium devoid of Ca2+ for various times reduced carbachol stimulation of PLC with a substantial loss (88%) seen at 30 min. A progressive recovery of responses was observed following the reexposure of cells to Ca2+-containing medium (1.3 mM). However, these changes did not appear to result exclusively from changes in the cytosolic Ca2+ concentration ([Ca2+]i), which decreased to a lower steady level (approximately 25 nM decrease in 1-3 min after extracellular omission) and rapidly returned (within 1 min) to control values when extracellular Ca2+ was restored. Only after loading of the intracellular Ca2+ stores through a transient 1-min depolarization of cerebellar granule cells with 40 mM KCl, followed by washing in nondepolarizing buffer, was carbachol able to mobilize intracellular Ca2+. However, the same treatment resulted in an 80% enhancement of carbachol activation of PLC. In other experiments, partial depletion of the Ca2+ stores by pretreatment of cells with thapsigargin and caffeine resulted in an inhibition (18 and 52%, respectively) of the PLC response. Furthermore, chelation of cytosolic Ca2+ with BAPTA/AM did not influence muscarinic activation of PLC in either the control or predepolarized cells. These conditions, however, inhibited both the increase in [Ca2+]i and the PLC activation elicited by 40 mM KCl and abolished carbachol-induced intracellular Ca2+ release in predepolarized cells. Overall, these results suggest that muscarinic receptor activation of PLC in cerebellar granule cells can be modulated by changes in the loading state of the Ca2+ stores." @default.
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- W2005026579 date "2001-12-25" @default.
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- W2005026579 title "Intracellular Ca2+ Stores Regulate Muscarinic Receptor Stimulation of Phospholipase C in Cerebellar Granule Cells" @default.
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- W2005026579 doi "https://doi.org/10.1046/j.1471-4159.2000.740818.x" @default.
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