--- _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 D. J. Surmeier for sharing unpublished data, and Drs.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' ...