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- W2201452285 abstract "Grafe, Peter, Stefan Quasthoff, Julian Grosskreutz, and Christian Alzheimer. Function of the hyperpolarization-activated inward rectification in nonmyelinated peripheral rat and human axons. J. Neurophysiol. 77: 421–426, 1997. The function of time-dependent, hyperpolarization-activated inward rectification was analyzed on compound potentials of nonmyelinated axons in the mammalian peripheral nervous system. Isolated rat vagus nerves and fascicles of biopsied human sural nerve were tested in a three-chambered, Vaseline-gap organ bath at 37°C. Inward rectification was assessed by recording the effects of long-lasting hyperpolarizing currents on electrical excitability with the use of the method of threshold electrotonus (program QTRAC, copyright Institute of Neurology, London, UK) and by measuring activity-dependent changes in conduction velocity and membrane potential. Prominent time-dependent, cesium-sensitive inward rectification was revealed in rat vagus and human sural nerve by recording threshold electrotonus to 200-ms hyperpolarizing current pulses. A slowing of compound action potential conduction was observed during a gradual increase in the stimulation frequency from 0.1 to 3 Hz. Above a stimulation frequency of 0.3 Hz, this slowing of conduction was enhanced during bath application of 1 mM cesium. Cesium did not alter action potential waveforms during stimulation at frequencies <1 Hz. Cesium-induced slowing in action potential conduction was correlated with membrane hyperpolarization. The hyperpolarization by cesium was stronger during higher stimulation frequencies and small in unstimulated nerves. These data show that a cesium-sensitive, time-dependent inward rectification in peripheral rat and human nonmyelinated nerve fibers limits the slowing in conduction seen in such axons at action potential frequencies higher than ∼0.3 Hz." @default.
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- W2201452285 date "1997-01-01" @default.
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- W2201452285 title "Function of the Hyperpolarization-Activated Inward Rectification in Nonmyelinated Peripheral Rat and Human Axons" @default.
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- W2201452285 doi "https://doi.org/10.1152/jn.1997.77.1.421" @default.
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