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• W2034218429 abstract "The intracellular free Ca2+ ion concentration ([Ca2+]i) was measured using fura-2 microspec-trofluorimetry in individual rat pancreatic β-cells prepared by enzymatic digestion and fluorescence-activated cell sorting. The mean basal concentration of [Ca2+]i in β-cells in the presence of 4.4 mM glucose and 1.8 mM Ca2+ was 112±1.6 nM (n=207). The action of acetylcholine (ACh) was concentration-dependent, and raising the concentration resulted in [Ca2+]i spikes of increasing amplitude and duration in some, but not all of the β-cells. In addition, the β-cells demonstrated variable sensitivity to ACh. The increases in [Ca2+]i were rapid, transient and were blocked by atropine at 10−6M. A brief exposure to 50 mM K+ resulted in a transient increase in [Ca2+]i similar to that induced by ACh, but resistant to atropine. A high concentration of ACh (100μL 10−4M or 10−3M) induced [Ca2+]i oscillations in 11 out of 57 β-cells in the presence of 4.4 mM glucose. Using calcium channel blockers and Ca2+ free medium, the source of the increase in [Ca2+]i was deduced to be from extracellular spaces. Changing the temperature from 22 to 37°C did not affect the action of ACh on [Ca2+]i. These data strongly suggest that ACh exerted a direct action on [Ca2+]i in normal rat pancreatic β-cells and support a role for Ca2+ as a second messenger in the action of ACh." @default.
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• W2034218429 date "1994-01-01" @default.
• W2034218429 modified "2023-09-27" @default.
• W2034218429 title "Characterization of Acetylcholine-induced Increases in Cytosolic Free Calcium Concentration in Individual Rat Pancreatic β-cells" @default.
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• W2034218429 doi "https://doi.org/10.3109/15419069409097265" @default.
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