Persistent Na Current and Ca Current Boost Graded Depolarization of Rat Retinal Amacrine Cells in Culture

نویسندگان

  • AMANE KOIZUMI
  • AKIMICHI KANEKO
چکیده

Koizumi, Amane, Shu-Ichi Watanabe, and Akimichi Kaneko. Persistent Na current and Ca current boost graded depolarization of rat retinal amacrine cells in culture. J Neurophysiol 86: 1006–1016, 2001. Retinal amacrine cells are depolarized by the excitatory synaptic input from bipolar cells. When a graded depolarization exceeds the threshold level, trains of action potentials are generated. There have been several reports that both spikes and graded depolarization are sensitive to tetrodotoxin (TTX). In the present study, we investigated the contribution of voltage-gated currents to membrane depolarization by using rat GABAergic amacrine cells in culture recorded by the patch-clamp method. Injection of a negative current induced membrane hyperpolarization, the waveform of which can be well fitted by a single exponential function. Injection of positive current depolarized the cell, and the depolarization exceeded the amplitude expected from the passive properties of the membrane. The boosted depolarization sustained after the current was turned off. Either 1 mM TTX or 2 mM Co suppressed the boosted depolarization, and co-application of TTX and Co blocked it completely. Under the voltage clamp, we identified a transient Na current (fast INa), a TTX-sensitive persistent current that reversed the polarity near the equilibrium potential of Na (INaP), and three types of Ca 21 currents (ICa), L, N, and the pharmacological agent-resistant type (R type). These findings suggest that the INaP and ICa of amacrine cells boost depolarization evoked by the excitatory synaptic input, and they may aid the spread of electrical signals among dendritic arbors of amacrine cells.

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تاریخ انتشار 2001