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• W2001578275 abstract "Studies were performed in cortical neurons to determine if voltage- and time-dependent membrane currents could be recognized and characterized in the dynamic, in vivo state. Intracellular measurements made in neurons of the precruciate cortex of awake cats with single-electrode voltage-clamp (SEVC) techniques disclosed an early outward current to depolarizing command steps in 124 of 137 cells studied. The voltage-dependent properties of the early outward current closely resembled those of A-currents studied in vitro in vertebrate and invertebrate neurons. The current was activated rapidly at onset latencies of less than two ms, fell to flat plateau levels within 60-120 ms during sustained depolarization, and was reduced or eliminated in 22 of 23 cells following intracellular administration of 3- or 4-aminopyridine. The magnitude of outward current in response to depolarizing commands was increased by preceding steady hyperpolarization and reduced by preceding steady depolarization. (The steady potentials were of 9.8 s duration and +/- 40 mV apart from the holding potentials.) Since return to the holding potentials occurred 80 ms before the onset of the command steps, the changes in membrane properties that were induced lasted beyond cessation of the steady polarizing stimuli themselves. Spiking did not prevent recognition of the early outward current as judged from its appearance before and after intracellular application of QX-314 to reduce spike activity. Apart from fast inward currents associated with spike potentials, the early outward current was the most conspicuous and characteristic membrane current noted in these recordings. An additional current component that was noted but not characterized in these studies was a slow, depolarization-induced inward current that could be reduced by intracellular injection of QX-314." @default.
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• W2001578275 date "1989-02-01" @default.
• W2001578275 modified "2023-10-14" @default.
• W2001578275 title "An aminopyridine-sensitive, early outward current recorded in vivo in neurons of the precruciate cortex of cats using single-electrode voltage-clamp techniques" @default.
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• W2001578275 doi "https://doi.org/10.1016/0006-8993(89)91568-0" @default.
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• W2001578275 hasPublicationYear "1989" @default.
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