pH-dependent modulation of voltage gating in connexin45 homotypic and connexin45/connexin43 heterotypic gap junctions

Intracellular pH (pH(i)) can change during physiological and pathological conditions causing significant changes of electrical and metabolic cell-cell communication through gap junction (GJ) channels. In HeLa cells expressing wild-type connexin45 (Cx45) as well as Cx45 and Cx43 tagged with EGFP, we...

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Autores: Palacios-Prado, Nicolas, Briggs, Stephan W., Skeberdis, Vytenis A., Pranevicius, Mindaugas, Bennett, Michael V. L., Bukauskas, Feliksas F.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2010
País:Chile
OAI Identifier:oai:repositorio.anid.cl:10533/253219
Acceso en línea:https://hdl.handle.net/10533/253219
Access Level:acceso abierto
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dc.title.es_CL.fl_str_mv pH-dependent modulation of voltage gating in connexin45 homotypic and connexin45/connexin43 heterotypic gap junctions
dc.title.journal.es_CL.fl_str_mv Proceedings Of The National Academy Of Sciences Of The United States Of America
title pH-dependent modulation of voltage gating in connexin45 homotypic and connexin45/connexin43 heterotypic gap junctions
spellingShingle pH-dependent modulation of voltage gating in connexin45 homotypic and connexin45/connexin43 heterotypic gap junctions
Palacios-Prado, Nicolas
title_short pH-dependent modulation of voltage gating in connexin45 homotypic and connexin45/connexin43 heterotypic gap junctions
title_full pH-dependent modulation of voltage gating in connexin45 homotypic and connexin45/connexin43 heterotypic gap junctions
title_fullStr pH-dependent modulation of voltage gating in connexin45 homotypic and connexin45/connexin43 heterotypic gap junctions
title_full_unstemmed pH-dependent modulation of voltage gating in connexin45 homotypic and connexin45/connexin43 heterotypic gap junctions
title_sort pH-dependent modulation of voltage gating in connexin45 homotypic and connexin45/connexin43 heterotypic gap junctions
dc.creator.none.fl_str_mv Palacios-Prado, Nicolas
Briggs, Stephan W.
Skeberdis, Vytenis A.
Pranevicius, Mindaugas
Bennett, Michael V. L.
Bukauskas, Feliksas F.
author Palacios-Prado, Nicolas
author_facet Palacios-Prado, Nicolas
Briggs, Stephan W.
Skeberdis, Vytenis A.
Pranevicius, Mindaugas
Bennett, Michael V. L.
Bukauskas, Feliksas F.
author_role author
author2 Briggs, Stephan W.
Skeberdis, Vytenis A.
Pranevicius, Mindaugas
Bennett, Michael V. L.
Bukauskas, Feliksas F.
author2_role author
author
author
author
author
description Intracellular pH (pH(i)) can change during physiological and pathological conditions causing significant changes of electrical and metabolic cell-cell communication through gap junction (GJ) channels. In HeLa cells expressing wild-type connexin45 (Cx45) as well as Cx45 and Cx43 tagged with EGFP, we examined how pH(i) affects junctional conductance (g(j)) and g(j) dependence on transjunctional voltage (V(j)). To characterize V(j) gating, we fit the g(j)-V(j) relation using a stochastic four-state model containing one V(j)-sensitive gate in each apposed hemichannel (aHC); aHC open probability was a Boltzmann function of the fraction of V(j) across it. Using the model, we estimated gating parameters characterizing sensitivity to V(j) and number of functional channels. In homotypic Cx45 and heterotypic Cx45/Cx43-EGFP GJs, pH(i) changes from 7.2 to approximately 8.0 shifted g(j)-V(j) dependence of Cx45 aHCs along the V(j) axis resulting in increased probability of GJ channels being in the fully open state without change in the slope of g(j) dependence on V(j). In contrast, acidification shifted g(j)-V(j) dependence in the opposite direction, reducing open probability; acidification also reduced the number of functional channels. Correlation between the number of channels in Cx45-EGFP GJs and maximal g(j) achieved under alkaline conditions showed that only approximately 4% of channels were functional. The acid dissociation constant (pK(a)) of g(j)-pH(i) dependence of Cx45/Cx45 GJs was approximately 7. The pK(a) of heterotypic Cx45/Cx43-EGFP GJs was lower, approximately 6.7, between the pK(a)s of Cx45 and Cx43-EGFP (approximately 6.5) homotypic GJs. In summary, pH(i) significantly modulates junctional conductance of Cx45 by affecting both V(j) gating and number of functional channels.
publishDate 2010
dc.date.issued.es_CL.fl_str_mv 2010
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spelling Bukauskas, Feliksas F.Bennett, Michael V. L.Pranevicius, MindaugasSkeberdis, Vytenis A.Briggs, Stephan W.Palacios-Prado, Nicolas201010.1073/pnas.1004552107https://hdl.handle.net/10533/253219http://purl.org/coar/access_right/c_abf2pH-dependent modulation of voltage gating in connexin45 homotypic and connexin45/connexin43 heterotypic gap junctionsPalacios-Prado, NicolasBriggs, Stephan W.Skeberdis, Vytenis A.Pranevicius, MindaugasBennett, Michael V. L.Bukauskas, Feliksas F.2022-04-08T14:06:59Z2022-07-08T20:14:54Z2022-04-08T14:06:59Z2022-07-08T20:14:54Z2010Intracellular pH (pH(i)) can change during physiological and pathological conditions causing significant changes of electrical and metabolic cell-cell communication through gap junction (GJ) channels. In HeLa cells expressing wild-type connexin45 (Cx45) as well as Cx45 and Cx43 tagged with EGFP, we examined how pH(i) affects junctional conductance (g(j)) and g(j) dependence on transjunctional voltage (V(j)). To characterize V(j) gating, we fit the g(j)-V(j) relation using a stochastic four-state model containing one V(j)-sensitive gate in each apposed hemichannel (aHC); aHC open probability was a Boltzmann function of the fraction of V(j) across it. Using the model, we estimated gating parameters characterizing sensitivity to V(j) and number of functional channels. In homotypic Cx45 and heterotypic Cx45/Cx43-EGFP GJs, pH(i) changes from 7.2 to approximately 8.0 shifted g(j)-V(j) dependence of Cx45 aHCs along the V(j) axis resulting in increased probability of GJ channels being in the fully open state without change in the slope of g(j) dependence on V(j). In contrast, acidification shifted g(j)-V(j) dependence in the opposite direction, reducing open probability; acidification also reduced the number of functional channels. Correlation between the number of channels in Cx45-EGFP GJs and maximal g(j) achieved under alkaline conditions showed that only approximately 4% of channels were functional. The acid dissociation constant (pK(a)) of g(j)-pH(i) dependence of Cx45/Cx45 GJs was approximately 7. The pK(a) of heterotypic Cx45/Cx43-EGFP GJs was lower, approximately 6.7, between the pK(a)s of Cx45 and Cx43-EGFP (approximately 6.5) homotypic GJs. 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