Research article summary (published 19 Oct 2009):

Kv7/KCNQ channels control action potential phasing of pyramidal neurons during hippocampal gamma oscillations in vitro.

Full Abstract

While the synaptic mechanisms involved in the generation of in vitro network oscillations have been widely studied, little is known about the importance of voltage-gated currents during such activity. Here we study the role of the M-current (I(M)) in the modulation of network oscillations in the gamma-frequency range (20-80 Hz). Kv7/KCNQ subunits, the molecular correlates of I(M), are abundantly expressed in CA1 and CA3 pyramidal neurons, and I(M) is an important modulator of pyramidal neuron firing. Using hippocampal slices, we recorded field activity and pyramidal neuron action potential timing during kainate-induced gamma oscillations. Application of the specific I(M) blocker XE991 causes a significant reduction of gamma oscillation amplitude with no significant change in oscillation frequency. Concomitant CA3 pyramidal neuron recordings show a significant increase in action potential frequency during ongoing gamma oscillations after the application of XE991. This increase is associated with a significant loss of periodicity of pyramidal neuron action potentials relative to the phase of the gamma oscillations. Using dynamic clamp, we show that I(M) acts to improve the periodicity of action potential timing and to decrease action potential frequency. We further validate these results in a compartmental model of a pyramidal neuron. Our work suggests that I(M) modulates gamma oscillations by regulating the phasing of action potential firing in pyramidal neurons.

Author information

Author/s: Leão, Richardson N (RN); Tan, Hui Min (HM); Fisahn, André (A);

Affiliation: Department of Neuroscience, Neuronal Oscillations Laboratory, Karolinska Institute, 17177 Stockholm, Sweden.

Journal and publication information

Publication Type: In Vitro; Journal Article; Research Support, Non-U.S. Gov't

Journal: The Journal of neuroscience : the official journal of the Society for Neuroscience (J Neurosci), published in United States. (Language: eng)

Reference: 2009-Oct; vol 29 (issue 42) : pp 13353-64

Dates: Created 2009/10/22; Completed 2009/11/06;

PMID: 19846723, status: MEDLINE (last retrieval date: 11/6/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Action Potentials - drug effects; physiology Animals Animals, Newborn Anthracenes - pharmacology Barium Compounds - pharmacology Biological Clocks - drug effects; physiology Biophysics Chlorides - pharmacology Dose-Response Relationship, Drug Electric Stimulation - methods Electroencephalography - methods Excitatory Amino Acid Agonists - pharmacology

Fourier Analysis Hippocampus - cytology Indoles - pharmacology KCNQ Potassium Channels - genetics; physiology Kainic Acid - pharmacology Models, Neurological Patch-Clamp Techniques - methods Potassium Channel Blockers - pharmacology Pyramidal Cells - drug effects; physiology Pyridines - pharmacology Rats Rats, Sprague-Dawley

Associated Chemicals: 10,10-bis(4-pyridinylmethyl)-9(10H)-anthracenone (0) ; Anthracenes (0) ; Barium Compounds (0) ; Chlorides (0) ; Excitatory Amino Acid Agonists (0) ; Indoles (0) ; KCNQ Potassium Channels (0) ; Potassium Channel Blockers (0) ; Pyridines (0) ; barium chloride (10361-37-2) ; linopirdine (105431-72-9) ; Kainic Acid (487-79-6)

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