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- W2391497639 abstract "It has been shown previously that caffeine sensitive Ca 2+ stores gated by ryanodine receptors (RyRs) and the mechanism of Ca 2+ induced Ca 2+ release (CICR) exist in the soma of carp retinal ON type bipolar cells [1] . Using immunocytochemistry of RyRs and intracellular Ca 2+ measurement, we further investigated whether RyR gated Ca 2+ stores are present in the terminal of these cells. Immunocytochemical study of both vertical section and dissociated cells of the retina indicates that RyRs were mainly localized in the soma of ON type bipolar cells. Caffeine up to 40 mmol/L could not induce Ca 2+ signal in the terminal. After resting [Ca 2+ ] i was slightly increased by raising external K + to 10 mmol/L, no Ca 2+ signal was induced by caffeine in the terminal. In the presence of forskolin or dopamine, by which intracellular cAMP and in turn cAMP dependent phosphorylation are enhanced, caffeine also failed to bring Ca 2+ signal in the terminal. In addition, 50 μmol/L ryanodine did not show any effect on Ca 2+ signal evoked by 65 mmol/L K + for 1 min or 2 min in the terminal. Taken together, it is indicated that RyR gated caffeine sensitive Ca 2+ stores and CICR are absent in the terminal of carp retinal ON type bipolar cells." @default.
- W2391497639 created "2016-06-24" @default.
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- W2391497639 date "2001-01-01" @default.
- W2391497639 modified "2023-09-25" @default.
- W2391497639 title "Absence of ryanodine receptor gated Ca~(2+) stores in the terminal of carp retinal ON-type bipolar cells" @default.
- W2391497639 hasPublicationYear "2001" @default.
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