Cargando…

Calcium‐induced calcium release in proximity to hair cell BK channels revealed by PKA activation

Large‐conductance calcium‐activated potassium (BK) channels play a critical role in electrical resonance, a mechanism of frequency selectivity in chicken hair cells. We determine that BK currents are dependent on inward flow of Ca(2+), and intracellular buffering of Ca(2+). Entry of Ca(2+) is furthe...

Descripción completa

Detalles Bibliográficos
Autores principales: Bai, Jun‐ping, Xue, Na, Lawal, Omolara, Nyati, Anda, Santos‐Sacchi, Joseph, Navaratnam, Dhasakumar
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7399380/
https://www.ncbi.nlm.nih.gov/pubmed/32748549
http://dx.doi.org/10.14814/phy2.14449
_version_ 1783566135699963904
author Bai, Jun‐ping
Xue, Na
Lawal, Omolara
Nyati, Anda
Santos‐Sacchi, Joseph
Navaratnam, Dhasakumar
author_facet Bai, Jun‐ping
Xue, Na
Lawal, Omolara
Nyati, Anda
Santos‐Sacchi, Joseph
Navaratnam, Dhasakumar
author_sort Bai, Jun‐ping
collection PubMed
description Large‐conductance calcium‐activated potassium (BK) channels play a critical role in electrical resonance, a mechanism of frequency selectivity in chicken hair cells. We determine that BK currents are dependent on inward flow of Ca(2+), and intracellular buffering of Ca(2+). Entry of Ca(2+) is further amplified locally by calcium‐induced Ca(2+) release (CICR) in close proximity to plasma membrane BK channels. Ca(2+) imaging reveals peripheral clusters of high concentrations of Ca(2+) that are suprathreshold to that needed to activate BK channels. Protein kinase A (PKA) activation increases the size of BK currents likely by recruiting more BK channels due to spatial spread of high Ca(2+) concentrations in turn from increasing CICR. STORM imaging confirms the presence of nanodomains with ryanodine and IP3 receptors in close proximity to the Slo subunit of BK channels. Together, these data require a rethinking of how electrical resonance is brought about and suggest effects of CICR in synaptic release. Both genders were included in this study.
format Online
Article
Text
id pubmed-7399380
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher John Wiley and Sons Inc.
record_format MEDLINE/PubMed
spelling pubmed-73993802020-08-06 Calcium‐induced calcium release in proximity to hair cell BK channels revealed by PKA activation Bai, Jun‐ping Xue, Na Lawal, Omolara Nyati, Anda Santos‐Sacchi, Joseph Navaratnam, Dhasakumar Physiol Rep Original Research Large‐conductance calcium‐activated potassium (BK) channels play a critical role in electrical resonance, a mechanism of frequency selectivity in chicken hair cells. We determine that BK currents are dependent on inward flow of Ca(2+), and intracellular buffering of Ca(2+). Entry of Ca(2+) is further amplified locally by calcium‐induced Ca(2+) release (CICR) in close proximity to plasma membrane BK channels. Ca(2+) imaging reveals peripheral clusters of high concentrations of Ca(2+) that are suprathreshold to that needed to activate BK channels. Protein kinase A (PKA) activation increases the size of BK currents likely by recruiting more BK channels due to spatial spread of high Ca(2+) concentrations in turn from increasing CICR. STORM imaging confirms the presence of nanodomains with ryanodine and IP3 receptors in close proximity to the Slo subunit of BK channels. Together, these data require a rethinking of how electrical resonance is brought about and suggest effects of CICR in synaptic release. Both genders were included in this study. John Wiley and Sons Inc. 2020-08-03 /pmc/articles/PMC7399380/ /pubmed/32748549 http://dx.doi.org/10.14814/phy2.14449 Text en © 2020 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on behalf of The Physiological Society and the American Physiological Society. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research
Bai, Jun‐ping
Xue, Na
Lawal, Omolara
Nyati, Anda
Santos‐Sacchi, Joseph
Navaratnam, Dhasakumar
Calcium‐induced calcium release in proximity to hair cell BK channels revealed by PKA activation
title Calcium‐induced calcium release in proximity to hair cell BK channels revealed by PKA activation
title_full Calcium‐induced calcium release in proximity to hair cell BK channels revealed by PKA activation
title_fullStr Calcium‐induced calcium release in proximity to hair cell BK channels revealed by PKA activation
title_full_unstemmed Calcium‐induced calcium release in proximity to hair cell BK channels revealed by PKA activation
title_short Calcium‐induced calcium release in proximity to hair cell BK channels revealed by PKA activation
title_sort calcium‐induced calcium release in proximity to hair cell bk channels revealed by pka activation
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7399380/
https://www.ncbi.nlm.nih.gov/pubmed/32748549
http://dx.doi.org/10.14814/phy2.14449
work_keys_str_mv AT baijunping calciuminducedcalciumreleaseinproximitytohaircellbkchannelsrevealedbypkaactivation
AT xuena calciuminducedcalciumreleaseinproximitytohaircellbkchannelsrevealedbypkaactivation
AT lawalomolara calciuminducedcalciumreleaseinproximitytohaircellbkchannelsrevealedbypkaactivation
AT nyatianda calciuminducedcalciumreleaseinproximitytohaircellbkchannelsrevealedbypkaactivation
AT santossacchijoseph calciuminducedcalciumreleaseinproximitytohaircellbkchannelsrevealedbypkaactivation
AT navaratnamdhasakumar calciuminducedcalciumreleaseinproximitytohaircellbkchannelsrevealedbypkaactivation