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- W1484685406 abstract "The intracellular free Ca2+ concentration ([free Ca2+]i) was measured simultaneously with the Ca2+ extrusion from single isolated mouse pancreatic acinar cells placed in a microdroplet of extracellular solution using the fluorescent probes fura-2 and fluo-3. The extracellular solution had a low total calcium concentration (15-35 microM), and acetylcholine (ACh), applied by microionophoresis, therefore only evoked a transient elevation of [free Ca2+]i lasting about 2-5 min. The initial sharp rise in [free Ca2+]i from about 100 nM toward 0.5-1 microM was followed within seconds by an increase in the total calcium concentration in the microdroplet solution ([Ca]o). The rate of this rise of [Ca]o was dependent on the [free Ca2+]i elevation, and as [free Ca2+]i gradually decreased Ca2+ extrusion declined with the same time course. Ca2+ extrusion following ACh stimulation was not influenced by removal of all Na+ in the microdroplet solution indicating that the Ca2+ extrusion is not mediated by Na(+)-Ca2+ exchange but by the Ca2+ pump. The amount of Ca2+ extruded during the ACh-evoked transient rise in [free Ca2+]i corresponded to a decrease in the total intracellular Ca concentration of about 0.7 mM which is close to previously reported values (0.5-1 mM) for the total concentration of mobilizable calcium in these cells. Our results therefore demonstrate directly the ability of the Ca2+ pump to rapidly remove the large amount of Ca2+ released from the intracellular pools during receptor activation." @default.
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- W1484685406 date "1992-02-01" @default.
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- W1484685406 title "Acetylcholine-evoked increase in the cytoplasmic Ca2+ concentration and Ca2+ extrusion measured simultaneously in single mouse pancreatic acinar cells." @default.
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- W1484685406 doi "https://doi.org/10.1016/s0021-9258(19)50560-9" @default.
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