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dc.contributor.author | Scott, Ricardo S. | - |
dc.contributor.author | Bustillo, Diego | - |
dc.contributor.author | Olivos-Oré, Luis Alcides | - |
dc.contributor.author | Cuchillo-Ibáñez, Inmaculada | - |
dc.contributor.author | Barahona, María Victoria | - |
dc.contributor.author | Carbone, Emilio | - |
dc.contributor.author | Artalejo, Antonio R. | - |
dc.date.accessioned | 2012-07-10T11:36:40Z | - |
dc.date.available | 2012-07-10T11:36:40Z | - |
dc.date.issued | 2011 | - |
dc.identifier | doi: 10.1007/s00424-011-0991-9 | - |
dc.identifier | issn: 0031-6768 | - |
dc.identifier | e-issn: 1432-2013 | - |
dc.identifier.citation | Pflugers Archiv European Journal of Physiology 462(4): 545-557 (2011) | - |
dc.identifier.uri | http://hdl.handle.net/10261/53088 | - |
dc.description.abstract | BK channels modulate cell firing in excitable cells in a voltage-dependent manner regulated by fluctuations in free cytosolic Ca2+ during action potentials. Indeed, Ca2+-independent BK channel activity has ordinarily been considered not relevant for the physiological behaviour of excitable cells. We employed the patch-clamp technique and selective BK channel blockers to record K+ currents from bovine chromaffin cells at minimal intracellular (about 10 nM) and extracellular (free Ca2+) Ca2+ concentrations. Despite their low open probability under these conditions (V50 of +146.8 mV), BK channels were responsible for more than 25% of the total K+ efflux during the first millisecond of a step depolarisation to +20 mV. Moreover, BK channels activated about 30% faster (τ∈=∈0.55 ms) than the rest of available K+ channels. The other main source of fast voltage-dependent K+ efflux at such a low Ca2+ was a transient K+ (IA-type) current activating with V 50∈=∈-14.2 mV. We also studied the activation of BK currents in response to action potential waveforms and their contribution to shaping action potentials both in the presence and the absence of extracellular Ca2+. Our results show that BK channels activate during action potentials and accelerate cell repolarisation even at minimal Ca2+ concentration, and suggest that they could do so also in the presence of extracellular Ca2+, before Ca2+ entering the cell facilitates their activity. © 2011 Springer-Verlag. | - |
dc.description.sponsorship | This work was supported by grants from the Spanish Ministerio de Ciencia e Innovación (BFU2005-06034; Spanish Ion Channel Initiative (SICI) grant CSD2008-00005) to A.R.A. and (RYC-2009-03979 and SAF2010-20604) to R.S.S. | - |
dc.language.iso | eng | - |
dc.publisher | Springer Nature | - |
dc.rights | openAccess | - |
dc.title | Contribution of BK channels to action potential repolarisation at minimal cytosolic Ca2+ concentration in chromaffin cells | - |
dc.type | artículo | - |
dc.identifier.doi | 10.1007/s00424-011-0991-9 | - |
dc.date.updated | 2012-07-10T11:36:40Z | - |
dc.description.version | Peer Reviewed | - |
dc.type.coar | http://purl.org/coar/resource_type/c_6501 | es_ES |
item.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.grantfulltext | open | - |
item.openairetype | artículo | - |
item.fulltext | With Fulltext | - |
item.languageiso639-1 | en | - |
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