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• W2006046859 abstract "Ca2+ currents in response to an action potential were recorded extracellularly under non-voltage clamped conditions from rat motor nerve terminals. The Ca2+ current was blocked by Cd2+, Co2+, and Ni2+. A residual component that could not be blocked by inorganic cations was inhibited completely by tetrodotoxin (TTX). The Ca2+ current was also moderately sensitive to the N- and L-type Ca2+ channel-blocker omega-conotoxin but was insensitive to the L-type channel-specific dihydropyridines. When a fraction of the terminal K+ currents was blocked by 10 mM tetraethylammonium (TEA), the Ca2+ current duration decreased only slightly as stimulation frequency increased from 0.5 to 20 Hz. When K+ currents were blocked by TEA plus 3,4-diaminopyridine (250 microM) though, the Ca2+ current duration decreased from greater than 70 ms to 8-10 ms as stimulation frequency increased from 0.5 to 20 Hz. Recovery of the duration following 20-Hz stimulation occurred faster during subsequent stimulation at 0.5 Hz than at 2 Hz. ATP and ACh inhibit Ca2+ currents at stimulation frequencies ranging from 0.5 to 20 Hz; however, when the purinergic and cholinergic autoreceptors are blocked by theophylline (100 microM) and pirenzepine (3 microM), respectively, the frequency-induced decrease in current duration persisted. Thus, motor nerve terminal Ca2+ current duration is determined by stimulus repetition frequency; this appears to involve intracellular Ca2+ accumulation, although effects secondary to variability in the time course of changes in terminal membrane potentials cannot be ruled out." @default.
• W2006046859 created "2016-06-24" @default.
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• W2006046859 date "1992-07-01" @default.
• W2006046859 modified "2023-10-14" @default.
• W2006046859 title "Calcium currents in rat motor nerve terminals" @default.
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• W2006046859 doi "https://doi.org/10.1016/0006-8993(92)90885-d" @default.
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