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When Is a Potassium Channel Not a Potassium Channel?

Ever since they were first observed in Purkinje fibers of the heart, funny channels have had close connections to potassium channels. Indeed, funny channels were initially thought to produce a potassium current in the heart called I(K2). However, funny channels are completely unlike potassium channe...

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Detalles Bibliográficos
Autor principal: Accili, Eric
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9614928/
https://www.ncbi.nlm.nih.gov/pubmed/36325512
http://dx.doi.org/10.1093/function/zqac052
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author Accili, Eric
author_facet Accili, Eric
author_sort Accili, Eric
collection PubMed
description Ever since they were first observed in Purkinje fibers of the heart, funny channels have had close connections to potassium channels. Indeed, funny channels were initially thought to produce a potassium current in the heart called I(K2). However, funny channels are completely unlike potassium channels in ways that make their contributions to the physiology of cells unique. An important difference is the greater ability for sodium to permeate funny channels. Although it does not flow through the funny channel as easily as does potassium, sodium does permeate well enough to allow for depolarization of cells following a strong hyperpolarization. This is critical for the function of funny channels in places like the heart and brain. Computational analyses using recent structures of the funny channels have provided a possible mechanism for their unusual permeation properties.
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spelling pubmed-96149282022-11-01 When Is a Potassium Channel Not a Potassium Channel? Accili, Eric Function (Oxf) Evidence Review Ever since they were first observed in Purkinje fibers of the heart, funny channels have had close connections to potassium channels. Indeed, funny channels were initially thought to produce a potassium current in the heart called I(K2). However, funny channels are completely unlike potassium channels in ways that make their contributions to the physiology of cells unique. An important difference is the greater ability for sodium to permeate funny channels. Although it does not flow through the funny channel as easily as does potassium, sodium does permeate well enough to allow for depolarization of cells following a strong hyperpolarization. This is critical for the function of funny channels in places like the heart and brain. Computational analyses using recent structures of the funny channels have provided a possible mechanism for their unusual permeation properties. Oxford University Press 2022-10-07 /pmc/articles/PMC9614928/ /pubmed/36325512 http://dx.doi.org/10.1093/function/zqac052 Text en © The Author(s) 2022. Published by Oxford University Press on behalf of American Physiological Society. https://creativecommons.org/licenses/by-nc/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com
spellingShingle Evidence Review
Accili, Eric
When Is a Potassium Channel Not a Potassium Channel?
title When Is a Potassium Channel Not a Potassium Channel?
title_full When Is a Potassium Channel Not a Potassium Channel?
title_fullStr When Is a Potassium Channel Not a Potassium Channel?
title_full_unstemmed When Is a Potassium Channel Not a Potassium Channel?
title_short When Is a Potassium Channel Not a Potassium Channel?
title_sort when is a potassium channel not a potassium channel?
topic Evidence Review
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9614928/
https://www.ncbi.nlm.nih.gov/pubmed/36325512
http://dx.doi.org/10.1093/function/zqac052
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