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Correlation of Real-Time Catecholamine Release and Cytosolic CA2+ at SingleBovine Chromaffin Cells

机译:单次嗜铬细胞中实时儿茶酚胺释放与细胞内Ca2 +的相关性

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Previous investigations of the role of Ca2+ in stimulus-secretion coupling havebeen undertaken in populations of adrenal chromaffin cells. In the present study, the simultaneous detection of intracellular Ca2+, with the fluorescent probe fura-2, and catecholamine release, using a carbon-fiber microelectrode, are examined at single chromaffin cells in culture. Results from classic depolarizing stimuli, high potassium (30-140 mM) and 1,1-dimethyl-4-phenylpiperazinium (DMPP) (3-50 uM), show a dependence of peak cytosolic Ca2+ concentration and catecholamine release on secretagogue concentration. Catecholamine release induced by transient high K+ stimulation increases logarithmically with K+ concentration. Continuous exposure to veratridine (50 uM) induces oscillations in intracellular Ca2+, and at higher concentrations (100 uM) concomitant fluctuation of cytosolic Ca2+ and

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