Abstract.
Slow oscillations of cytosolic calcium ion concentration – \([{\text{Ca}}^{2 + } ]_{\text{c}} \) – typically originate from release by intracellular stores, but in some cell types can be triggered and sustained by Ca2+ influx as well. In this study we simultaneously monitored changes in \([{\text{Ca}}^{2 + } ]_{\text{c}} \) and in the electrical activity of the cell membrane by combining indo-1 and patch-clamp measurements in single rat chromaffin cells. By this approach we observed a novel type of spontaneous \([{\text{Ca}}^{2 + } ]_{\text{c}} \) oscillations, much faster than those previously described in these cells. These oscillations are triggered and sustained by complex electrical activity (slow action potentials and spike bursts), require Ca2+ influx and do not involve release from intracellular stores. The possible physiological implications of this new pathway of intracellular signalling are discussed.
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Received 30 July 2004; received after revision 14 October 2004; accepted 1 November 2004
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Micheletti, M., Brioschi, A., Fesce, R. et al. A novel pattern of fast calcium oscillations points to calcium and electrical activity cross-talk in rat chromaffin cells. CMLS, Cell. Mol. Life Sci. 62, 95–104 (2005). https://doi.org/10.1007/s00018-004-4338-y
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DOI: https://doi.org/10.1007/s00018-004-4338-y