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The role of two-pore-domain background K+ (K2P) channels in the thalamus

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Abstract

The thalamocortical system is characterized by two fundamentally different activity states, namely synchronized burst firing and tonic action potential generation, which mainly occur during the behavioral states of sleep and wakefulness, respectively. The switch between the two firing modes is crucially governed by the bidirectional modulation of members of the K2P channel family, namely tandem of P domains in a weakly inward rectifying K+ (TWIK)-related acid-sensitive K+ (TASK) and TWIK-related K+ (TREK) channels, in thalamocortical relay (TC) neurons. Several physicochemical stimuli including neurotransmitters, protons, di- and multivalent cations as well as clinically used drugs have been shown to modulate K2P channels in these cells. With respect to modulation of these channels by G-protein-coupled receptors, PLCβ plays a unique role with both substrate breakdown and product synthesis exerting important functions. While the degradation of PIP2 leads to the closure of TREK channels, the production of DAG induces the inhibition of TASK channels. Therefore, TASK and TREK channels were found to be central elements in the control of thalamic activity modes. Since research has yet focused on identifying the muscarinic pathway underling the modulation of TASK and TREK channels in TC neurons, future studies should address other thalamic cell types and members of the K2P channel family.

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Acknowledgments

This work was funded by DFG (FOR 1086, TP2 to S.G.M. and T.B.).

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  1. Pawan Bista

    Present address: Department of Anatomy and Neurobiology, Washington University Medical School, 660 South Euclid Avenue, St. Louis, MO, 63110, USA

Authors and Affiliations

  1. Institut für Physiologie I, Westfälische Wilhelms-Universität, Robert-Koch-Str. 27a, 48149, Münster, Germany

    Pawan Bista, Manuela Cerina, Petra Ehling, Michael Leist, Hans-Christian Pape & Thomas Budde

  2. Klinik für Allgemeine Neurologie und Institut für Physiologie-Abteilung für Neuropathophysiologie, Westfälische Wilhelms-Universität, Albert-Schweitzer-Campus 1, 48149, Münster, Germany

    Petra Ehling & Sven G. Meuth

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  1. Pawan Bista
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  2. Manuela Cerina
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  3. Petra Ehling
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  4. Michael Leist
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  7. Thomas Budde
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Correspondence to Thomas Budde.

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Bista, P., Cerina, M., Ehling, P. et al. The role of two-pore-domain background K+ (K2P) channels in the thalamus. Pflugers Arch - Eur J Physiol 467, 895–905 (2015). https://doi.org/10.1007/s00424-014-1632-x

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  • DOI: https://doi.org/10.1007/s00424-014-1632-x

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