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- W1999324024 abstract "The kinetics of the changes in the cytoplasmic Ca2+ concentration (Ca2+i) and amylase release were measured in fura-2-loaded pancreatic acinar cells and perifused pancreatic acini, respectively. Cholecystokinin octapeptide (CCK-8) and its amphibian analogue caerulein induced similar dose-related increases of Ca2+i and amylase secretion with threshold concentrations of 2-6 x 10(-12) M, and maximal effects at 2 x 10(-10) M. The action of CCK/caerulein on Ca2+i was complex and similar to that of carbachol and bombesin with a prompt several-fold increase within seconds followed by a gradual decline over more than 5 min to a new sustained suprabasal level. The kinetics of amylase release in response to CCK and carbachol correlated with the changes in Ca2+i. Additions of the antagonists N2,O2-dibutyrylguanosine 3':5'-cyclic monophosphate and atropine after 30 min of CCK-8 and carbachol stimulation, respectively, were associated with prompt lowerings of Ca2+i and inhibitions of amylase secretion. The patterns observed with substance P (SP) and eledoisin were different with high concentrations (10(-8)-10(-7) M) giving monophasic increases of Ca2+i and amylase release. An initial stimulation of cells with a high dose of CCK eliminated the Ca2+i response to further stimulation with CCK, carbachol, bombesin and SP, whereas cells subjected to initial stimulation with SP responded to subsequent exposure to CCK with prolonged elevation of Ca2+i. The data indicate that stimulation with CCK, carbachol and bombesin may be associated with intracellular mobilization of calcium from more than one pool, and that an increase of Ca2+i is involved even in threshold stimulation of amylase release." @default.
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- W1999324024 date "1990-10-01" @default.
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- W1999324024 title "Stimulation of pancreatic amylase release is associated with a parallel sustained increase of cytoplasmic calcium" @default.
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- W1999324024 doi "https://doi.org/10.1016/0167-0115(90)90099-i" @default.
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