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- W284239171 abstract "Presynaptic Ca2+ channels mediate early stages of visual information processing in photoreceptors by facilitating the release of neurotransmitter and by receiving modulatory input that alters transmission. Two types of L-type Ca2+ channels, composed of alpha1F and alpha1D subunits and having similar biophysical andpharmacological properties, appear to form the principle voltage-dependent Ca2+ influx pathways in rods and cones, respectively. The role played by these channels in neurotransmitter release at these graded potential, non-spiking synapses, has been well described. The channels mediate sustained glutamate release in darkness where the cells rest at potentials near -40 mV, and signal increases in light intensity as the cells hyperpolarize negative to this value. Synaptic modulation and integration mediated by these channels has not yet been as fully described but appears to involve GABA, nitric oxide (NO), glutamate, and dopamine. Ca2+ permeable cyclic nucleotide gated (CNG) channels appear to have supporting roles at the photoreceptor output synapse and may transduce NO signals from other cells by either directly permitting Ca2+ influx or by providing depolarizing influences that gate voltage dependent Ca2+ channels." @default.
- W284239171 created "2016-06-24" @default.
- W284239171 creator A5063933580 @default.
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- W284239171 date "2002-01-01" @default.
- W284239171 modified "2023-10-18" @default.
- W284239171 title "Calcium Channels at the Photoreceptor Synapse" @default.
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- W284239171 doi "https://doi.org/10.1007/978-1-4615-0121-3_28" @default.
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