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• W2071031432 endingPage "130" @default.
• W2071031432 startingPage "121" @default.
• W2071031432 abstract "We examined the contribution of two intrinsic voltage-dependent calcium channels to the light-evoked responses of a non-spiking retinal neuron, the horizontal cell (HC). HC's isolated from the Xenopus retina were studied by the whole cell version of the patch clamp. In a mixture of agents which suppressed Na- and K-dependent currents, we identified a transient, low voltage-activated Ca current suppressed by Ba2+ and blocked by Ni2+ (T-type) and a sustained, high voltage-activated, dihydropyridine-sensitive Ca current that was enhanced by Ba2+ (L-type). We made simultaneous intracellular recordings from rods and HC's in the intact, dark-adapted Xenopus retina. Under certain stimulus conditions, transient oscillations appeared in HC responses but were absent in rod light-evoked waveforms. One type of transient was seen at relatively hyperpolarized potentials (<-45 mV), was enhanced by Sr2+ and inhibited by Ni2+. It thus appears to depend on a T-type Ca-current. A second type of oscillation was seen to be superimposed on a prolonged depolarizing wave following light off in the HC and as spike-like depolarizations in rods. These oscillations were enhanced by Ba2+ and Sr2+, but blocked by the dihydropyridine, nifedipine, indicating their dependence on an L-type calcium conductance. All calcium-dependent oscillations were suppressed by 0.05–0.5 mM Co2+. Suppression of glutamate neurotransmission with CNQX or kynurenate, or glycine neurotransmission with strychnine, enhanced the HC oscillations." @default.
• W2071031432 created "2016-06-24" @default.
• W2071031432 creator A5012266947 @default.
• W2071031432 creator A5028247307 @default.
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• W2071031432 date "1997-07-01" @default.
• W2071031432 modified "2023-10-03" @default.
• W2071031432 title "Both high- and low voltage-activated calcium currents contribute to the light-evoked responses of luminosity horizontal cells in the Xenopus retina" @default.
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• W2071031432 doi "https://doi.org/10.1016/s0006-8993(97)00374-0" @default.
• W2071031432 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9262166" @default.
• W2071031432 hasPublicationYear "1997" @default.
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