An allosteric gating model recapitulates the biophysical properties of IK,L expressed in mouse vestibular type I hair cells
- Autores
- Spaiardi, Paolo; Tavazzani, Elisa; Manca, Marco; Milesi, Verónica; Russo, Giancarlo; Prigioni, Ivo; Marcotti, Walter; Magistretti, Jacopo; Masetto, Sergio
- Año de publicación
- 2017
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Type I and type II hair cells are the sensory receptors of the mammalian vestibular epithelia. Type I hair cells are characterized by their basolateral membrane being enveloped in a single large afferent nerve terminal, named the calyx, and by the expression of a low‐voltage‐activated outward rectifying K+ current, IK,L. The biophysical properties and molecular profile of IK,L are still largely unknown. By using the patch‐clamp whole‐cell technique, we examined the voltage‐ and time‐dependent properties of IK,L in type I hair cells of the mouse semicircular canal. We found that the biophysical properties of IK,L were affected by an unstable K+ equilibrium potential (VeqK+). Both the outward and inward K+ currents shifted VeqK+ consistent with K+ accumulation or depletion, respectively, in the extracellular space, which we attributed to a residual calyx attached to the basolateral membrane of the hair cells. We therefore optimized the hair cell dissociation protocol in order to isolate mature type I hair cells without their calyx. In these cells, the uncontaminated IK,L showed a half‐activation at –79.6 mV and a steep voltage dependence (2.8 mV). IK,L also showed complex activation and deactivation kinetics, which we faithfully reproduced by an allosteric channel gating scheme where the channel is able to open from all (five) closed states. The ‘early’ open states substantially contribute to IK,L activation at negative voltages. This study provides the first complete description of the ‘native’ biophysical properties of IK,L in adult mouse vestibular type I hair cells.
Fil: Spaiardi, Paolo. Università degli Studi di Pavia; Italia
Fil: Tavazzani, Elisa. Università degli Studi di Pavia; Italia
Fil: Manca, Marco. Università degli Studi di Pavia; Italia
Fil: Milesi, Verónica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Estudios Inmunológicos y Fisiopatológicos. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Estudios Inmunológicos y Fisiopatológicos; Argentina
Fil: Russo, Giancarlo. Università degli Studi di Pavia; Italia
Fil: Prigioni, Ivo. Università degli Studi di Pavia; Italia
Fil: Marcotti, Walter. University of Sheffield. Department of Biomedical Science; Reino Unido
Fil: Magistretti, Jacopo. Università degli Studi di Pavia; Italia
Fil: Masetto, Sergio. Università degli Studi di Pavia; Italia - Materia
-
CHANNEL GATING MODEL
IK,L
TYPE I VESTIBULAR HAIR CELL - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/48729
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oai:ri.conicet.gov.ar:11336/48729 |
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An allosteric gating model recapitulates the biophysical properties of IK,L expressed in mouse vestibular type I hair cellsSpaiardi, PaoloTavazzani, ElisaManca, MarcoMilesi, VerónicaRusso, GiancarloPrigioni, IvoMarcotti, WalterMagistretti, JacopoMasetto, SergioCHANNEL GATING MODELIK,LTYPE I VESTIBULAR HAIR CELLhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Type I and type II hair cells are the sensory receptors of the mammalian vestibular epithelia. Type I hair cells are characterized by their basolateral membrane being enveloped in a single large afferent nerve terminal, named the calyx, and by the expression of a low‐voltage‐activated outward rectifying K+ current, IK,L. The biophysical properties and molecular profile of IK,L are still largely unknown. By using the patch‐clamp whole‐cell technique, we examined the voltage‐ and time‐dependent properties of IK,L in type I hair cells of the mouse semicircular canal. We found that the biophysical properties of IK,L were affected by an unstable K+ equilibrium potential (VeqK+). Both the outward and inward K+ currents shifted VeqK+ consistent with K+ accumulation or depletion, respectively, in the extracellular space, which we attributed to a residual calyx attached to the basolateral membrane of the hair cells. We therefore optimized the hair cell dissociation protocol in order to isolate mature type I hair cells without their calyx. In these cells, the uncontaminated IK,L showed a half‐activation at –79.6 mV and a steep voltage dependence (2.8 mV). IK,L also showed complex activation and deactivation kinetics, which we faithfully reproduced by an allosteric channel gating scheme where the channel is able to open from all (five) closed states. The ‘early’ open states substantially contribute to IK,L activation at negative voltages. This study provides the first complete description of the ‘native’ biophysical properties of IK,L in adult mouse vestibular type I hair cells.Fil: Spaiardi, Paolo. Università degli Studi di Pavia; ItaliaFil: Tavazzani, Elisa. Università degli Studi di Pavia; ItaliaFil: Manca, Marco. Università degli Studi di Pavia; ItaliaFil: Milesi, Verónica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Estudios Inmunológicos y Fisiopatológicos. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Estudios Inmunológicos y Fisiopatológicos; ArgentinaFil: Russo, Giancarlo. Università degli Studi di Pavia; ItaliaFil: Prigioni, Ivo. Università degli Studi di Pavia; ItaliaFil: Marcotti, Walter. University of Sheffield. Department of Biomedical Science; Reino UnidoFil: Magistretti, Jacopo. Università degli Studi di Pavia; ItaliaFil: Masetto, Sergio. Università degli Studi di Pavia; ItaliaWiley Blackwell Publishing, Inc2017-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/48729Spaiardi, Paolo; Tavazzani, Elisa; Manca, Marco; Milesi, Verónica; Russo, Giancarlo; et al.; An allosteric gating model recapitulates the biophysical properties of IK,L expressed in mouse vestibular type I hair cells; Wiley Blackwell Publishing, Inc; The Journal Of Physiology; 595; 21; 11-2017; 6735-67500022-3751CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://physoc.onlinelibrary.wiley.com/doi/abs/10.1113/JP274202info:eu-repo/semantics/altIdentifier/doi/10.1113/JP274202info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:03:03Zoai:ri.conicet.gov.ar:11336/48729instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:03:03.887CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
An allosteric gating model recapitulates the biophysical properties of IK,L expressed in mouse vestibular type I hair cells |
title |
An allosteric gating model recapitulates the biophysical properties of IK,L expressed in mouse vestibular type I hair cells |
spellingShingle |
An allosteric gating model recapitulates the biophysical properties of IK,L expressed in mouse vestibular type I hair cells Spaiardi, Paolo CHANNEL GATING MODEL IK,L TYPE I VESTIBULAR HAIR CELL |
title_short |
An allosteric gating model recapitulates the biophysical properties of IK,L expressed in mouse vestibular type I hair cells |
title_full |
An allosteric gating model recapitulates the biophysical properties of IK,L expressed in mouse vestibular type I hair cells |
title_fullStr |
An allosteric gating model recapitulates the biophysical properties of IK,L expressed in mouse vestibular type I hair cells |
title_full_unstemmed |
An allosteric gating model recapitulates the biophysical properties of IK,L expressed in mouse vestibular type I hair cells |
title_sort |
An allosteric gating model recapitulates the biophysical properties of IK,L expressed in mouse vestibular type I hair cells |
dc.creator.none.fl_str_mv |
Spaiardi, Paolo Tavazzani, Elisa Manca, Marco Milesi, Verónica Russo, Giancarlo Prigioni, Ivo Marcotti, Walter Magistretti, Jacopo Masetto, Sergio |
author |
Spaiardi, Paolo |
author_facet |
Spaiardi, Paolo Tavazzani, Elisa Manca, Marco Milesi, Verónica Russo, Giancarlo Prigioni, Ivo Marcotti, Walter Magistretti, Jacopo Masetto, Sergio |
author_role |
author |
author2 |
Tavazzani, Elisa Manca, Marco Milesi, Verónica Russo, Giancarlo Prigioni, Ivo Marcotti, Walter Magistretti, Jacopo Masetto, Sergio |
author2_role |
author author author author author author author author |
dc.subject.none.fl_str_mv |
CHANNEL GATING MODEL IK,L TYPE I VESTIBULAR HAIR CELL |
topic |
CHANNEL GATING MODEL IK,L TYPE I VESTIBULAR HAIR CELL |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Type I and type II hair cells are the sensory receptors of the mammalian vestibular epithelia. Type I hair cells are characterized by their basolateral membrane being enveloped in a single large afferent nerve terminal, named the calyx, and by the expression of a low‐voltage‐activated outward rectifying K+ current, IK,L. The biophysical properties and molecular profile of IK,L are still largely unknown. By using the patch‐clamp whole‐cell technique, we examined the voltage‐ and time‐dependent properties of IK,L in type I hair cells of the mouse semicircular canal. We found that the biophysical properties of IK,L were affected by an unstable K+ equilibrium potential (VeqK+). Both the outward and inward K+ currents shifted VeqK+ consistent with K+ accumulation or depletion, respectively, in the extracellular space, which we attributed to a residual calyx attached to the basolateral membrane of the hair cells. We therefore optimized the hair cell dissociation protocol in order to isolate mature type I hair cells without their calyx. In these cells, the uncontaminated IK,L showed a half‐activation at –79.6 mV and a steep voltage dependence (2.8 mV). IK,L also showed complex activation and deactivation kinetics, which we faithfully reproduced by an allosteric channel gating scheme where the channel is able to open from all (five) closed states. The ‘early’ open states substantially contribute to IK,L activation at negative voltages. This study provides the first complete description of the ‘native’ biophysical properties of IK,L in adult mouse vestibular type I hair cells. Fil: Spaiardi, Paolo. Università degli Studi di Pavia; Italia Fil: Tavazzani, Elisa. Università degli Studi di Pavia; Italia Fil: Manca, Marco. Università degli Studi di Pavia; Italia Fil: Milesi, Verónica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Estudios Inmunológicos y Fisiopatológicos. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Estudios Inmunológicos y Fisiopatológicos; Argentina Fil: Russo, Giancarlo. Università degli Studi di Pavia; Italia Fil: Prigioni, Ivo. Università degli Studi di Pavia; Italia Fil: Marcotti, Walter. University of Sheffield. Department of Biomedical Science; Reino Unido Fil: Magistretti, Jacopo. Università degli Studi di Pavia; Italia Fil: Masetto, Sergio. Università degli Studi di Pavia; Italia |
description |
Type I and type II hair cells are the sensory receptors of the mammalian vestibular epithelia. Type I hair cells are characterized by their basolateral membrane being enveloped in a single large afferent nerve terminal, named the calyx, and by the expression of a low‐voltage‐activated outward rectifying K+ current, IK,L. The biophysical properties and molecular profile of IK,L are still largely unknown. By using the patch‐clamp whole‐cell technique, we examined the voltage‐ and time‐dependent properties of IK,L in type I hair cells of the mouse semicircular canal. We found that the biophysical properties of IK,L were affected by an unstable K+ equilibrium potential (VeqK+). Both the outward and inward K+ currents shifted VeqK+ consistent with K+ accumulation or depletion, respectively, in the extracellular space, which we attributed to a residual calyx attached to the basolateral membrane of the hair cells. We therefore optimized the hair cell dissociation protocol in order to isolate mature type I hair cells without their calyx. In these cells, the uncontaminated IK,L showed a half‐activation at –79.6 mV and a steep voltage dependence (2.8 mV). IK,L also showed complex activation and deactivation kinetics, which we faithfully reproduced by an allosteric channel gating scheme where the channel is able to open from all (five) closed states. The ‘early’ open states substantially contribute to IK,L activation at negative voltages. This study provides the first complete description of the ‘native’ biophysical properties of IK,L in adult mouse vestibular type I hair cells. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-11 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/48729 Spaiardi, Paolo; Tavazzani, Elisa; Manca, Marco; Milesi, Verónica; Russo, Giancarlo; et al.; An allosteric gating model recapitulates the biophysical properties of IK,L expressed in mouse vestibular type I hair cells; Wiley Blackwell Publishing, Inc; The Journal Of Physiology; 595; 21; 11-2017; 6735-6750 0022-3751 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/48729 |
identifier_str_mv |
Spaiardi, Paolo; Tavazzani, Elisa; Manca, Marco; Milesi, Verónica; Russo, Giancarlo; et al.; An allosteric gating model recapitulates the biophysical properties of IK,L expressed in mouse vestibular type I hair cells; Wiley Blackwell Publishing, Inc; The Journal Of Physiology; 595; 21; 11-2017; 6735-6750 0022-3751 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/https://physoc.onlinelibrary.wiley.com/doi/abs/10.1113/JP274202 info:eu-repo/semantics/altIdentifier/doi/10.1113/JP274202 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Wiley Blackwell Publishing, Inc |
publisher.none.fl_str_mv |
Wiley Blackwell Publishing, Inc |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
reponame_str |
CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1844613841686626304 |
score |
13.070432 |