---
_id: '3488'
abstract:
- lang: eng
text: 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 (sow 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.
acknowledgement: Supported by German Israeli Foundation Grant I 0352–073.01/94 to
P.J. and Deutsche Forschungsgemeinschaft Grant Mo 432/3–1 to H.M. We thank Drs.
L. Y. Jan, D. McKinnon, O. Pongs, L. Salkoff, S. H. Snyder, and J. S. Trimmer for
providing plasmids, Dr. D. J. Surmeier for sharing unpublished data, and Drs. J.
Bischofberger and J. R. P. Geiger for critically reading this manuscript. M.M. and
J.H.S. contributed equally to this work.
article_processing_charge: No
article_type: original
author:
- first_name: Marco
full_name: Martina, Marco
last_name: Martina
- first_name: Jobst
full_name: Schultz, Jobst
last_name: Schultz
- first_name: Heimo
full_name: Ehmke, Heimo
last_name: Ehmke
- first_name: Hannah
full_name: Monyer, Hannah
last_name: Monyer
- first_name: Peter M
full_name: Jonas, Peter M
id: 353C1B58-F248-11E8-B48F-1D18A9856A87
last_name: Jonas
orcid: 0000-0001-5001-4804
citation:
ama: Martina M, Schultz J, Ehmke H, Monyer H, Jonas PM. Functional and molecular
differences between voltage-gated K+ channels of fast-spiking interneurons and
pyramidal neurons of rat hippocampus. Journal of Neuroscience. 1998;18(20):8111-8125.
doi:10.1523/JNEUROSCI.18-20-08111.1998
apa: Martina, M., Schultz, J., Ehmke, H., Monyer, H., & Jonas, P. M. (1998).
Functional and molecular differences between voltage-gated K+ channels of fast-spiking
interneurons and pyramidal neurons of rat hippocampus. Journal of Neuroscience.
Society for Neuroscience. https://doi.org/10.1523/JNEUROSCI.18-20-08111.1998
chicago: Martina, Marco, Jobst Schultz, Heimo Ehmke, Hannah Monyer, and Peter M
Jonas. “Functional and Molecular Differences between Voltage-Gated K+ Channels
of Fast-Spiking Interneurons and Pyramidal Neurons of Rat Hippocampus.” Journal
of Neuroscience. Society for Neuroscience, 1998. https://doi.org/10.1523/JNEUROSCI.18-20-08111.1998.
ieee: M. Martina, J. Schultz, H. Ehmke, H. Monyer, and P. M. Jonas, “Functional
and molecular differences between voltage-gated K+ channels of fast-spiking interneurons
and pyramidal neurons of rat hippocampus,” Journal of Neuroscience, vol.
18, no. 20. Society for Neuroscience, pp. 8111–8125, 1998.
ista: Martina M, Schultz J, Ehmke H, Monyer H, Jonas PM. 1998. Functional and molecular
differences between voltage-gated K+ channels of fast-spiking interneurons and
pyramidal neurons of rat hippocampus. Journal of Neuroscience. 18(20), 8111–8125.
mla: Martina, Marco, et al. “Functional and Molecular Differences between Voltage-Gated
K+ Channels of Fast-Spiking Interneurons and Pyramidal Neurons of Rat Hippocampus.”
Journal of Neuroscience, vol. 18, no. 20, Society for Neuroscience, 1998,
pp. 8111–25, doi:10.1523/JNEUROSCI.18-20-08111.1998.
short: M. Martina, J. Schultz, H. Ehmke, H. Monyer, P.M. Jonas, Journal of Neuroscience
18 (1998) 8111–8125.
date_created: 2018-12-11T12:03:35Z
date_published: 1998-10-15T00:00:00Z
date_updated: 2022-08-29T14:20:39Z
day: '15'
doi: 10.1523/JNEUROSCI.18-20-08111.1998
extern: '1'
external_id:
pmid:
- '9763458'
intvolume: ' 18'
issue: '20'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6792860/
month: '10'
oa: 1
oa_version: None
page: 8111 - 8125
pmid: 1
publication: Journal of Neuroscience
publication_identifier:
issn:
- 0270-6474
publication_status: published
publisher: Society for Neuroscience
publist_id: '2899'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Functional and molecular differences between voltage-gated K+ channels of fast-spiking
interneurons and pyramidal neurons of rat hippocampus
type: journal_article
user_id: ea97e931-d5af-11eb-85d4-e6957dddbf17
volume: 18
year: '1998'
...