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Regenerative sodium and calcium currents in goldfish retinal ganglion cell somata

, : Regenerative sodium and calcium currents in goldfish retinal ganglion cell somata. Vision Research 31(3): 477-485

Whole-cell patch-clamp recordings were made from isolated goldfish retinal ganglion cell somata. Sodium- and calcium-dependent action potentials—blocked with tetrodotoxin (TTX) and Co+ ions, respectively—were evoked under current-clamp. Depolarization of these somata under voltage clamp activated distinguishable Na+ and Ca2+ conductances: the former was permeable to Na+, blocked by TTX, impermeable to N-methyl-d-glucamine and tris(hydroxymethyl)aminomethane, and began to activate around −45 mV; the latter were permeable to Ca2+, but not Co2+, and began to activate around −55 mV. These results are consistent with recordings from carp, frog, salamander and rat retinal ganglion cells.


PMID: 1668863

DOI: 10.1016/0042-6989(91)90099-q

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