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The mechanosensitive ion channel TRAAK is localized to the mammalian node of Ranvier

Brohawn, Stephen G ; Wang, Weiwei ; Handler, Annie ; Campbell, Ernest B ; Schwarz, Jürgen R ; MacKinnon, Roderick

eLife, 2019-11, Vol.8 [Periódico revisado por pares]

England: eLife Science Publications, Ltd

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Título:
The mechanosensitive ion channel TRAAK is localized to the mammalian node of Ranvier
Autor: Brohawn, Stephen G ; Wang, Weiwei ; Handler, Annie ; Campbell, Ernest B ; Schwarz, Jürgen R ; MacKinnon, Roderick
Assuntos: Action potential ; Action Potentials ; Animals ; Antibodies ; Fibers ; Localization ; Mechanical properties ; mechanosensation ; Membrane potential ; Mice ; Monoclonal antibodies ; Myelin sheath ; Nerve conduction ; Nervous system ; Neurobiology ; Neurons - enzymology ; Neurons - physiology ; Neuroscience ; Neurosciences ; node of Ranvier ; node-clamp ; Nodes of Ranvier ; Pain perception ; Physiological aspects ; Physiology ; Potassium channels ; Potassium Channels - analysis ; Proteins ; Ranvier's Nodes - enzymology ; Rats ; Roles ; Software
É parte de: eLife, 2019-11, Vol.8
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Department of Molecular and Cell Biology, The Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, United States.
These authors contributed equally to this work.
Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, United States.
Descrição: TRAAK is a membrane tension-activated K channel that has been associated through behavioral studies to mechanical nociception. We used specific monoclonal antibodies in mice to show that TRAAK is localized exclusively to nodes of Ranvier, the action potential propagating elements of myelinated nerve fibers. Approximately 80 percent of myelinated nerve fibers throughout the central and peripheral nervous system contain TRAAK in what is likely an all-nodes or no-nodes per axon fashion. TRAAK is not observed at the axon initial segment where action potentials are first generated. We used polyclonal antibodies, the TRAAK inhibitor RU2 and node clamp amplifiers to demonstrate the presence and functional properties of TRAAK in rat nerve fibers. TRAAK contributes to the 'leak' K current in mammalian nerve fiber conduction by hyperpolarizing the resting membrane potential, thereby increasing Na channel availability for action potential propagation. We speculate on why nodes of Ranvier contain a mechanosensitive K channel.
Editor: England: eLife Science Publications, Ltd
Idioma: Inglês

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The mechanosensitive ion channel TRAAK is localized to the mammalian node of Ranvier

Brohawn, Stephen G ; Wang, Weiwei ; Handler, Annie ; Campbell, Ernest B ; Schwarz, Jürgen R ; MacKinnon, Roderick

England: eLife Science Publications, Ltd

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