Ca2+ Sparks and Ca2+ waves are the subcellular events underlying Ca2+ overload during ischemia and reperfusion in perfused intact hearts

Autores
Mattiazzi, Ramona Alicia; Argenziano, Mariana Alejandra; Aguilar-Sanchez, Yuriana; Mazzocchi, Gabriela; Escobar, Ariel L.
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Abnormal intracellular Ca2+ cycling plays a key role in cardiac dysfunction, particularly during the setting of ischemia/reperfusion (I/R). During ischemia, there is an increase in cytosolic and sarcoplasmic reticulum (SR) Ca2+. At the onset of reperfusion, there is a transient and abrupt increase in cytosolic Ca2++, which occurs timely associated with reperfusion arrhythmias. However, little is known about the subcellular dynamics of Ca2+ increase during I/R, and a possible role of the SR as a mechanism underlying this increase has been previously overlooked. The aim of the present work is to test two main hypotheses: (1) An increase diastolic Ca2+ sparks frequency (cspf) constitutes a mayor substrate for the ischemia-induced diastolic Ca2+ increase; (2) an increase in cytosolic Ca2+ pro-arrhythmogenic events (Ca2+ waves), mediates the abrupt diastolic Ca2+ rise at the onset of reperfusion. We used confocal microscopy on mouse intact hearts loaded with Fluo-4. Hearts were submitted to global I/R (12/30min) to assess epicardial Ca2+ sparks in the whole heart. Intact heart sparks were faster than in isolated myocytes whereas cspf was not different. During ischemia, cspf significantly increased relative to preischemia (2.07±0.33 vs. 1.13±0.20 sp/s/100μm, n=29/34, 7 hearts). Reperfusion significantly changed Ca2+ sparks kinetics, by prolonging Ca2+ sparks rise time and decreased cspf. However, it significantly increased Ca2+ wave frequency relative to ischemia (0.71±0.14 vs. 0.38±0.06 w/s/100μm, n=32/33, 7 hearts). The results show for the first time the assessment of intact perfused heart Ca2+ sparks and provides direct evidence of increased Ca2+ sparks in ischemia that transform into Ca2+ waves during reperfusion. These waves may constitute a main trigger for reperfusion arrhythmias.
Fil: Mattiazzi, Ramona Alicia. Universidad Nacional de La Plata; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Argenziano, Mariana Alejandra. Universidad Nacional de San Martín; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Aguilar-Sanchez, Yuriana. University of California; Estados Unidos
Fil: Mazzocchi, Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata; Argentina
Fil: Escobar, Ariel L.. University of California; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
Ca2+ Sparks
Intact Heart
Ischemia/Reperfusion
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/37807
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/37807
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Ca2+ Sparks and Ca2+ waves are the subcellular events underlying Ca2+ overload during ischemia and reperfusion in perfused intact heartsMattiazzi, Ramona AliciaArgenziano, Mariana AlejandraAguilar-Sanchez, YurianaMazzocchi, GabrielaEscobar, Ariel L.Ca2+ SparksIntact HeartIschemia/Reperfusionhttps://purl.org/becyt/ford/3.1https://purl.org/becyt/ford/3Abnormal intracellular Ca2+ cycling plays a key role in cardiac dysfunction, particularly during the setting of ischemia/reperfusion (I/R). During ischemia, there is an increase in cytosolic and sarcoplasmic reticulum (SR) Ca2+. At the onset of reperfusion, there is a transient and abrupt increase in cytosolic Ca2++, which occurs timely associated with reperfusion arrhythmias. However, little is known about the subcellular dynamics of Ca2+ increase during I/R, and a possible role of the SR as a mechanism underlying this increase has been previously overlooked. The aim of the present work is to test two main hypotheses: (1) An increase diastolic Ca2+ sparks frequency (cspf) constitutes a mayor substrate for the ischemia-induced diastolic Ca2+ increase; (2) an increase in cytosolic Ca2+ pro-arrhythmogenic events (Ca2+ waves), mediates the abrupt diastolic Ca2+ rise at the onset of reperfusion. We used confocal microscopy on mouse intact hearts loaded with Fluo-4. Hearts were submitted to global I/R (12/30min) to assess epicardial Ca2+ sparks in the whole heart. Intact heart sparks were faster than in isolated myocytes whereas cspf was not different. During ischemia, cspf significantly increased relative to preischemia (2.07±0.33 vs. 1.13±0.20 sp/s/100μm, n=29/34, 7 hearts). Reperfusion significantly changed Ca2+ sparks kinetics, by prolonging Ca2+ sparks rise time and decreased cspf. However, it significantly increased Ca2+ wave frequency relative to ischemia (0.71±0.14 vs. 0.38±0.06 w/s/100μm, n=32/33, 7 hearts). The results show for the first time the assessment of intact perfused heart Ca2+ sparks and provides direct evidence of increased Ca2+ sparks in ischemia that transform into Ca2+ waves during reperfusion. These waves may constitute a main trigger for reperfusion arrhythmias.Fil: Mattiazzi, Ramona Alicia. Universidad Nacional de La Plata; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Argenziano, Mariana Alejandra. Universidad Nacional de San Martín; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Aguilar-Sanchez, Yuriana. University of California; Estados UnidosFil: Mazzocchi, Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata; ArgentinaFil: Escobar, Ariel L.. University of California; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaAcademic Press Ltd - Elsevier Science Ltd2015-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/37807Mattiazzi, Ramona Alicia; Argenziano, Mariana Alejandra; Aguilar-Sanchez, Yuriana; Mazzocchi, Gabriela; Escobar, Ariel L.; Ca2+ Sparks and Ca2+ waves are the subcellular events underlying Ca2+ overload during ischemia and reperfusion in perfused intact hearts; Academic Press Ltd - Elsevier Science Ltd; Journal of Molecular and Cellular Cardiology; 79; 2-2015; 69-780022-2828CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.yjmcc.2014.10.011info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0022282814003320info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:43:42Zoai:ri.conicet.gov.ar:11336/37807instacron: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 09:43:42.417CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Ca2+ Sparks and Ca2+ waves are the subcellular events underlying Ca2+ overload during ischemia and reperfusion in perfused intact hearts
title Ca2+ Sparks and Ca2+ waves are the subcellular events underlying Ca2+ overload during ischemia and reperfusion in perfused intact hearts
spellingShingle Ca2+ Sparks and Ca2+ waves are the subcellular events underlying Ca2+ overload during ischemia and reperfusion in perfused intact hearts
Mattiazzi, Ramona Alicia
Ca2+ Sparks
Intact Heart
Ischemia/Reperfusion
title_short Ca2+ Sparks and Ca2+ waves are the subcellular events underlying Ca2+ overload during ischemia and reperfusion in perfused intact hearts
title_full Ca2+ Sparks and Ca2+ waves are the subcellular events underlying Ca2+ overload during ischemia and reperfusion in perfused intact hearts
title_fullStr Ca2+ Sparks and Ca2+ waves are the subcellular events underlying Ca2+ overload during ischemia and reperfusion in perfused intact hearts
title_full_unstemmed Ca2+ Sparks and Ca2+ waves are the subcellular events underlying Ca2+ overload during ischemia and reperfusion in perfused intact hearts
title_sort Ca2+ Sparks and Ca2+ waves are the subcellular events underlying Ca2+ overload during ischemia and reperfusion in perfused intact hearts
dc.creator.none.fl_str_mv Mattiazzi, Ramona Alicia
Argenziano, Mariana Alejandra
Aguilar-Sanchez, Yuriana
Mazzocchi, Gabriela
Escobar, Ariel L.
author Mattiazzi, Ramona Alicia
author_facet Mattiazzi, Ramona Alicia
Argenziano, Mariana Alejandra
Aguilar-Sanchez, Yuriana
Mazzocchi, Gabriela
Escobar, Ariel L.
author_role author
author2 Argenziano, Mariana Alejandra
Aguilar-Sanchez, Yuriana
Mazzocchi, Gabriela
Escobar, Ariel L.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Ca2+ Sparks
Intact Heart
Ischemia/Reperfusion
topic Ca2+ Sparks
Intact Heart
Ischemia/Reperfusion
purl_subject.fl_str_mv https://purl.org/becyt/ford/3.1
https://purl.org/becyt/ford/3
dc.description.none.fl_txt_mv Abnormal intracellular Ca2+ cycling plays a key role in cardiac dysfunction, particularly during the setting of ischemia/reperfusion (I/R). During ischemia, there is an increase in cytosolic and sarcoplasmic reticulum (SR) Ca2+. At the onset of reperfusion, there is a transient and abrupt increase in cytosolic Ca2++, which occurs timely associated with reperfusion arrhythmias. However, little is known about the subcellular dynamics of Ca2+ increase during I/R, and a possible role of the SR as a mechanism underlying this increase has been previously overlooked. The aim of the present work is to test two main hypotheses: (1) An increase diastolic Ca2+ sparks frequency (cspf) constitutes a mayor substrate for the ischemia-induced diastolic Ca2+ increase; (2) an increase in cytosolic Ca2+ pro-arrhythmogenic events (Ca2+ waves), mediates the abrupt diastolic Ca2+ rise at the onset of reperfusion. We used confocal microscopy on mouse intact hearts loaded with Fluo-4. Hearts were submitted to global I/R (12/30min) to assess epicardial Ca2+ sparks in the whole heart. Intact heart sparks were faster than in isolated myocytes whereas cspf was not different. During ischemia, cspf significantly increased relative to preischemia (2.07±0.33 vs. 1.13±0.20 sp/s/100μm, n=29/34, 7 hearts). Reperfusion significantly changed Ca2+ sparks kinetics, by prolonging Ca2+ sparks rise time and decreased cspf. However, it significantly increased Ca2+ wave frequency relative to ischemia (0.71±0.14 vs. 0.38±0.06 w/s/100μm, n=32/33, 7 hearts). The results show for the first time the assessment of intact perfused heart Ca2+ sparks and provides direct evidence of increased Ca2+ sparks in ischemia that transform into Ca2+ waves during reperfusion. These waves may constitute a main trigger for reperfusion arrhythmias.
Fil: Mattiazzi, Ramona Alicia. Universidad Nacional de La Plata; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Argenziano, Mariana Alejandra. Universidad Nacional de San Martín; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Aguilar-Sanchez, Yuriana. University of California; Estados Unidos
Fil: Mazzocchi, Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata; Argentina
Fil: Escobar, Ariel L.. University of California; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description Abnormal intracellular Ca2+ cycling plays a key role in cardiac dysfunction, particularly during the setting of ischemia/reperfusion (I/R). During ischemia, there is an increase in cytosolic and sarcoplasmic reticulum (SR) Ca2+. At the onset of reperfusion, there is a transient and abrupt increase in cytosolic Ca2++, which occurs timely associated with reperfusion arrhythmias. However, little is known about the subcellular dynamics of Ca2+ increase during I/R, and a possible role of the SR as a mechanism underlying this increase has been previously overlooked. The aim of the present work is to test two main hypotheses: (1) An increase diastolic Ca2+ sparks frequency (cspf) constitutes a mayor substrate for the ischemia-induced diastolic Ca2+ increase; (2) an increase in cytosolic Ca2+ pro-arrhythmogenic events (Ca2+ waves), mediates the abrupt diastolic Ca2+ rise at the onset of reperfusion. We used confocal microscopy on mouse intact hearts loaded with Fluo-4. Hearts were submitted to global I/R (12/30min) to assess epicardial Ca2+ sparks in the whole heart. Intact heart sparks were faster than in isolated myocytes whereas cspf was not different. During ischemia, cspf significantly increased relative to preischemia (2.07±0.33 vs. 1.13±0.20 sp/s/100μm, n=29/34, 7 hearts). Reperfusion significantly changed Ca2+ sparks kinetics, by prolonging Ca2+ sparks rise time and decreased cspf. However, it significantly increased Ca2+ wave frequency relative to ischemia (0.71±0.14 vs. 0.38±0.06 w/s/100μm, n=32/33, 7 hearts). The results show for the first time the assessment of intact perfused heart Ca2+ sparks and provides direct evidence of increased Ca2+ sparks in ischemia that transform into Ca2+ waves during reperfusion. These waves may constitute a main trigger for reperfusion arrhythmias.
publishDate 2015
dc.date.none.fl_str_mv 2015-02
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/11336/37807
Mattiazzi, Ramona Alicia; Argenziano, Mariana Alejandra; Aguilar-Sanchez, Yuriana; Mazzocchi, Gabriela; Escobar, Ariel L.; Ca2+ Sparks and Ca2+ waves are the subcellular events underlying Ca2+ overload during ischemia and reperfusion in perfused intact hearts; Academic Press Ltd - Elsevier Science Ltd; Journal of Molecular and Cellular Cardiology; 79; 2-2015; 69-78
0022-2828
CONICET Digital
CONICET
url http://hdl.handle.net/11336/37807
identifier_str_mv Mattiazzi, Ramona Alicia; Argenziano, Mariana Alejandra; Aguilar-Sanchez, Yuriana; Mazzocchi, Gabriela; Escobar, Ariel L.; Ca2+ Sparks and Ca2+ waves are the subcellular events underlying Ca2+ overload during ischemia and reperfusion in perfused intact hearts; Academic Press Ltd - Elsevier Science Ltd; Journal of Molecular and Cellular Cardiology; 79; 2-2015; 69-78
0022-2828
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.yjmcc.2014.10.011
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0022282814003320
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Academic Press Ltd - Elsevier Science Ltd
publisher.none.fl_str_mv Academic Press Ltd - Elsevier Science Ltd
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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score 13.070432

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