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Function of K2P channels in the mammalian node of Ranvier
Schwarz
, Jürgen
R
.
The Journal of physiology, 2021-10, Vol.599 (19), p.4427-4439
[Periódico revisado por pares]
London: Wiley Subscription Services, Inc
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Título:
Function of K2P channels in the mammalian node of Ranvier
Autor:
Schwarz
, Jürgen
R
.
Assuntos:
Action potential
;
Arachidonic acid
;
Body temperature
;
Channel opening
;
Depolarization
;
K2P channels
;
mammalian myelinated nerve fiber
;
Membrane potential
;
Myelin
;
Na channels
;
node of Ranvier
;
Nodes of Ranvier
;
Potassium channels (voltage-gated)
;
Potassium conductance
;
Sodium channels
É parte de:
The Journal of physiology, 2021-10, Vol.599 (19), p.4427-4439
Notas:
https://doi.org/10.1113/JP281723#support‐information‐section
Edited by: Ian Forsythe
The peer review history is available in the Supporting Information section of this article
This is an Editor's Choice article from the 1 October 2021 issue.
.
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição:
In myelinated nerve fibres, action potentials are generated at nodes of Ranvier. These structures are located at interruptions of the myelin sheath, forming narrow gaps with small rings of axolemma freely exposed to the extracellular space. The mammalian node contains a high density of Na+ channels and K+‐selective leakage channels. Voltage‐dependent Kv1 channels are only present in the juxta‐paranode. Recently, the leakage channels have been identified as K2P channels (TRAAK, TREK‐1). K2P channels are K+‐selective ‘background’ channels, characterized by outward rectification and their ability to be activated, e.g. by temperature, mechanical stretch or arachidonic acid. We are only beginning to elucidate the peculiar functions of nodal K2P channels. I will discuss two functions of the nodal K2P‐mediated conductance. First, at body temperature K2P channels have a high open probability, thereby inducing a resting potential of about −85 mV. This negative resting potential reduces steady‐state Na+ channel inactivation and ensures a large Na+ inward current upon a depolarizing stimulus. Second, the K2P conductance is involved in nodal action potential repolarization. The identification of nodal K2P channels is exciting since it shows that the nodal K+ conductance is not a fixed value but can be changed: it can be increased or decreased by a broad range of K2P modulators, thereby modulating, for example, the resting potential. The functional importance of nodal K2P channels will be exemplified by describing in more detail the function of the K2P conductance increase by raising the temperature from room temperature to 37°C. figure legend A, model of a myelinated nerve fibre. B, nerve fibre segments and distinct distribution of ion channels.
Editor:
London: Wiley Subscription Services, Inc
Idioma:
Inglês
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