TAILIEUCHUNG - Báo cáo khoa học: Synchronization of Ca2+ oscillations: a capacitative (AC) electrical coupling model in neuroepithelium

Increases in intracellular [Ca 2+ ] occur synchronously between cells in the neuroepithelium. If neuroepithelial cells were capable of generating action potentials synchronized by gap junctions (direct current electrical coupling), the influx of Ca 2+ through voltage-activated Ca 2+ channels would lead to a synchronous increase in intracellular [Ca 2+ ]. | ỊFEBS Journal MINIREVIEW Synchronization of Ca2 oscillations a capacitative AC electrical coupling model in neuroepithelium Masayuki Yamashita Department of Physiology I Nara MedicalUniversity Kashihara Japan Keywords Ca2 oscillation Ca2 store neuronal development synchronization voltage fluctuation Correspondence M. Yamashita Department of Physiology I Nara MedicalUniversity Shijo-cho 840 Kashihara 634-8521 Japan Fax 81 744 29 0306 Tel 81 744 29 8827 E-mail yama@ Received 23 March 2009 revised 2 October 2009 accepted 9 October 2009 doi Increases in intracellular Ca2 occur synchronously between cells in the neuroepithelium. If neuroepithelial cells were capable of generating action potentials synchronized by gap junctions direct current electrical coupling the influx of Ca2 through voltage-activated Ca2 channels would lead to a synchronous increase in intracellular Ca2 . However no action potential is generated in neuroepithelial cells and the Ca2 increase is instead produced by the release of Ca2 from intracellular Ca2 stores. Recently synchronous fluctuations in the membrane potential of Ca2 stores were recorded using an organelle-specific voltage-sensitive dye. On the basis of these recordings a capacitative alternating current AC electrical coupling model for the synchronization of voltage fluctuations of Ca2 store potential was proposed Yamashita M 2006 FEBS Lett 580 4979-4983 Yamashita M 2o0s FEBS J 275 4022-4032 . Ca2 efflux from the Ca2 store and K counterinflux into the store cause alternating voltage changes across the store membrane and the voltage fluctuation induces ACs. In cases where the store membrane is closely apposed to the plasma membrane and the cells are tightly packed which is true of neuroepithelial cells the voltage fluctuation of the store membrane is synchronized between the cells by the AC currents through the series capacitance of these membranes. This article provides a short review of .

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