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- W2024853018 abstract "Trout pineal cells maintained in primary culture produce melatonin in high amounts during night time and low amounts during daytime. The dark-induced increase in melatonin production was enhanced, in a dose-dependent manner, by elevating extracellular calcium concentration. Low external calcium concentration reduced nocturnal and diurnal melatonin production. Bay K 8644 increased, in a dose-dependent manner, the dark-induced rise in melatonin output, and this effect was antagonized by nifedipine and verapamil. This suggests a role for the dihydropyridine calcium channels in the regulation of the melatonin output. To confirm this, patch-clamp recordings (whole-cell perforated) were run in a 20 mmol/l barium medium at different holding potentials from -80 mV. A voltage-dependent inward current was activated from -30 mV to +40 mV with a maximal amplitude being observed at 0 mV. This current was drastically increased in the presence of Bay K 8644. Nifedipine inhibited the current both in the absence or in the presence of Bay K 8644. Our results are consistent with the idea that extracellular calcium participates in the control of melatonin secretion by photoreceptor cells. It is suggested that activation of the voltage-dependent L-type channel may modulate this secretion." @default.
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- W2024853018 date "1994-07-01" @default.
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- W2024853018 title "Calcium and melatonin production in dissociated trout pineal photoreceptor cells in culture" @default.
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- W2024853018 doi "https://doi.org/10.1016/s0143-4160(05)80006-5" @default.
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