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The Journal of Neuroscience, May 1, 1998, 18(9):3124-3137
Somatodendritic Depolarization-Activated Potassium Currents in Rat Neostriatal Cholinergic Interneurons Are Predominantly of the A Type and Attributable to Coexpression of Kv4.2 and Kv4.1 Subunits
W.-J. Song, T. Tkatch, G. Baranauskas, N. Ichinohe, S. T. Kitai, and D. J. Surmeier Department of Anatomy and Neurobiology, College of Medicine, University of Tennessee, Memphis, Memphis, Tennessee 38163
Unlike other neostriatal neurons, cholinergic interneurons exhibit spontaneous, low-frequency, repetitive firing. To gain an understanding of the K+ channels regulating this behavior, acutely isolated adult rat cholinergic interneurons were studied using whole-cell voltage-clamp and single-cell reverse transcription-PCR techniques. Cholinergic interneurons were identified by the presence of choline acetyltransferase (ChAT) mRNA. Depolarization-activated potassium currents in cholinergic interneurons were dominated by a rapidly inactivating, K+-selective A current that became active at subthreshold potentials. Depolarizing prepulses inactivated this component of the current, leaving a delayed, rectifier-like current. Micromolar concentrations of Cd2+ dramatically shifted the voltage dependence of the A current without significantly affecting the delayed rectifier. The A-channel antagonist 4-aminopyridine (4-AP) produced a voltage-dependent block (IC50, ~1 mM) with a prominent crossover at millimolar concentrations. On the other hand, TEA preferentially blocked the sustained current component at concentrations <10 mM. Single-cell mRNA profiling of subunits known to give rise to rapidly inactivating K+ currents revealed the coexpression of Kv4.1, Kv4.2, and Kv1.4 mRNAs but low or undetectable levels of Kv4.3 and Kv3.4 mRNAs. Kv1.1,
1, and
Key words: A current; delayed rectifier; tetraethylammonium; 4-aminopyridine; voltage clamp; single-cell RT-PCR; acutely dissociated neurons; Kv1; Kv2; Kv3
Copyright © 1998 Society for Neuroscience 0270-6474/98/1893124-14$05.00/0
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