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Previous Article | Next Article
The Journal of Neuroscience, October 15, 1998, 18(20):8111-8125
Functional and Molecular Differences between Voltage-Gated K+ Channels of Fast-Spiking Interneurons and Pyramidal Neurons of Rat Hippocampus
Marco Martina1, Jobst H. Schultz2, Heimo Ehmke2, Hannah Monyer3, and Peter Jonas1 1 Physiologisches Institut der Universität Freiburg, D-79104 Freiburg, Germany, 2 Physiologisches Institut der Universität Heidelberg, D-69120 Heidelberg, Germany, and 3 Zentrum für Molekulare Biologie der Universität Heidelberg, D-69120 Heidelberg, Germany
We have examined gating and pharmacological characteristics of somatic K+ channels in fast-spiking interneurons and regularly spiking principal neurons of hippocampal slices. In nucleated patches isolated from basket cells of the dentate gyrus, a fast delayed rectifier K+ current component that was highly sensitive to tetraethylammonium (TEA) and 4-aminopyridine (4-AP) (half-maximal inhibitory concentrations <0.1 mM) predominated, contributing an average of 58% to the total K+ current in these cells. By contrast, in pyramidal neurons of the CA1 region a rapidly inactivating A-type K+ current component that was TEA-resistant prevailed, contributing 61% to the total K+ current. Both types of neurons also showed small amounts of the K+ current component mainly found in the other type of neuron and, in addition, a slow delayed rectifier K+ current component with intermediate properties (slow inactivation, intermediate sensitivity to TEA). Single-cell RT-PCR analysis of mRNA revealed that Kv3 (Kv3.1, Kv3.2) subunit transcripts were expressed in almost all (89%) of the interneurons but only in 17% of the pyramidal neurons. In contrast, Kv4 (Kv4.2, Kv4.3) subunit mRNAs were present in 87% of pyramidal neurons but only in 55% of interneurons. Selective block of fast delayed rectifier K+ channels, presumably assembled from Kv3 subunits, by 4-AP reduced substantially the action potential frequency in interneurons. These results indicate that the differential expression of Kv3 and Kv4 subunits shapes the action potential phenotypes of principal neurons and interneurons in the cortex.
Key words: interneurons; voltage-gated K+ channels; Kv1, Kv2, Kv3, Kv4 subunits; nucleated patch; single-cell RT-PCR; hippocampal slices
Copyright © 1998 Society for Neuroscience 0270-6474/98/18208111-15$05.00/0
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S. Nedergaard
Regulation of Action Potential Size and Excitability in Substantia Nigra Compacta Neurons: Sensitivity to 4-Aminopyridine
J Neurophysiol, December 1, 1999; 82(6): 2903 - 2913.
[Abstract] [Full Text] [PDF]
R. Hernandez-Pineda, A. Chow, Y. Amarillo, H. Moreno, M. Saganich, E. V.-S. de Miera, A. Hernandez-Cruz, and B. Rudy
Kv3.1-Kv3.2 Channels Underlie a High-Voltage-Activating Component of the Delayed Rectifier K+ Current in Projecting Neurons From the Globus Pallidus
J Neurophysiol, September 1, 1999; 82(3): 1512 - 1528.
[Abstract] [Full Text] [PDF]
S. Vassanelli and P. Fromherz
Transistor Probes Local Potassium Conductances in the Adhesion Region of Cultured Rat Hippocampal Neurons
J. Neurosci., August 15, 1999; 19(16): 6767 - 6773.
[Abstract] [Full Text] [PDF]
G. Baranauskas, T. Tkatch, and D. J. Surmeier
Delayed Rectifier Currents in Rat Globus Pallidus Neurons Are Attributable to Kv2.1 and Kv3.1/3.2 K+ Channels
J. Neurosci., August 1, 1999; 19(15): 6394 - 6404.
[Abstract] [Full Text] [PDF]
M. Song, G. Helguera, M. Eghbali, N. Zhu, M. M. Zarei, R. Olcese, L. Toro, and E. Stefani
Remodeling of Kv4.3 Potassium Channel Gene Expression under the Control of Sex Hormones
J. Biol. Chem., August 17, 2001; 276(34): 31883 - 31890.
[Abstract] [Full Text] [PDF]
D. Hess and A. El Manira
Characterization of a high-voltage-activated IA current with a role in spike timing and locomotor pattern generation
PNAS, April 24, 2001; 98(9): 5276 - 5281.
[Abstract] [Full Text] [PDF]
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