Ischemia time impacts on respiratory chain functions and Ca


Journal

Journal of cardiothoracic surgery
ISSN: 1749-8090
Titre abrégé: J Cardiothorac Surg
Pays: England
ID NLM: 101265113

Informations de publication

Date de publication:
14 May 2019
Historique:
received: 20 12 2018
accepted: 22 04 2019
entrez: 16 5 2019
pubmed: 16 5 2019
medline: 2 7 2019
Statut: epublish

Résumé

Mitochondrial impairment can result from myocardial ischemia reperfusion injury (IR). Despite cardioplegic arrest, IR-associated cardiodepression is a major problem in heart surgery. We determined the effect of increasing ischemia time on the respiratory chain (RC) function, the inner membrane polarization and Ca Wistar rat hearts were divided into 4 groups of stop-flow induced warm global IR using a pressure-controlled Langendorff system: 0, 15, 30 and 40 min of ischemia with 30 min of reperfusion, respectively. Myocardial contractility was determined from left ventricular pressure records (dP/dt, dPmax) with an intraventricular balloon. Following reperfusion, SSM were isolated and analyzed regarding electron transport chain (ETC) coupling by polarography (Clark-Type electrode), membrane polarization (JC1 fluorescence) and Ca LV contractility and systolic pressure during reperfusion were impaired by increasing ischemic times. Ischemia reduced ETC oxygen consumption in IR40/30 compared to IR0/30 at complex I-V (8.1 ± 1.2 vs. 18.2 ± 2.0 nmol/min) and II-IV/V (16.4 ± 2.6/14.8 ± 2.3 vs. 2.3 ± 0.6 nmol/min) in state 3 respiration (p < 0.01). Relative membrane potential revealed a distinct hyperpolarization in IR30/30 and IR40/30 (171.5 ± 17.4% and 170.9 ± 13.5%) compared to IR0/30 (p < 0.01), wearing off swiftly after CCCP-induced uncoupling. Excess mitochondrial permeability transition pore (mPTP)-gated Ca Ischemia prolongation in IR injury gradually impaired SSM in terms of respiratory chain function and Ca

Sections du résumé

BACKGROUND BACKGROUND
Mitochondrial impairment can result from myocardial ischemia reperfusion injury (IR). Despite cardioplegic arrest, IR-associated cardiodepression is a major problem in heart surgery. We determined the effect of increasing ischemia time on the respiratory chain (RC) function, the inner membrane polarization and Ca
METHODS METHODS
Wistar rat hearts were divided into 4 groups of stop-flow induced warm global IR using a pressure-controlled Langendorff system: 0, 15, 30 and 40 min of ischemia with 30 min of reperfusion, respectively. Myocardial contractility was determined from left ventricular pressure records (dP/dt, dPmax) with an intraventricular balloon. Following reperfusion, SSM were isolated and analyzed regarding electron transport chain (ETC) coupling by polarography (Clark-Type electrode), membrane polarization (JC1 fluorescence) and Ca
RESULTS RESULTS
LV contractility and systolic pressure during reperfusion were impaired by increasing ischemic times. Ischemia reduced ETC oxygen consumption in IR40/30 compared to IR0/30 at complex I-V (8.1 ± 1.2 vs. 18.2 ± 2.0 nmol/min) and II-IV/V (16.4 ± 2.6/14.8 ± 2.3 vs. 2.3 ± 0.6 nmol/min) in state 3 respiration (p < 0.01). Relative membrane potential revealed a distinct hyperpolarization in IR30/30 and IR40/30 (171.5 ± 17.4% and 170.9 ± 13.5%) compared to IR0/30 (p < 0.01), wearing off swiftly after CCCP-induced uncoupling. Excess mitochondrial permeability transition pore (mPTP)-gated Ca
CONCLUSIONS CONCLUSIONS
Ischemia prolongation in IR injury gradually impaired SSM in terms of respiratory chain function and Ca

Identifiants

pubmed: 31088484
doi: 10.1186/s13019-019-0911-1
pii: 10.1186/s13019-019-0911-1
pmc: PMC6518521
doi:

Substances chimiques

Cations 0
Calcium SY7Q814VUP

Types de publication

Evaluation Study Journal Article

Langues

eng

Sous-ensembles de citation

IM

Pagination

92

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Auteurs

Marcus Leistner (M)

Department of Thoracic, Cardiac and Vascular Surgery, University Medical Center Goettingen, Goettingen, Germany. marcusleistner@googlemail.com.
Department of Cardiothoracic and Thoracic Vascular Surgery, University Hospital Wuerzburg, Wuerzburg, Germany. marcusleistner@googlemail.com.

Stefanie Sommer (S)

Institute for Laboratory and Transfusion Medicine, Herz- und Diabeteszentrum Nordrheinwestfalen (HDZ-NRW), Bad Oeynhausen, Germany.
Department of Cardiothoracic and Thoracic Vascular Surgery, University Hospital Wuerzburg, Wuerzburg, Germany.

Peer Kanofsky (P)

Department of Cardiothoracic and Thoracic Vascular Surgery, University Hospital Wuerzburg, Wuerzburg, Germany.

Rainer Leyh (R)

Department of Cardiothoracic and Thoracic Vascular Surgery, University Hospital Wuerzburg, Wuerzburg, Germany.

Sebastian-Patrick Sommer (SP)

Department of Thoracic and Cardiovascular Surgery, Herz- und Diabeteszentrum Nordrheinwestfalen (HDZ-NRW), Bad Oeynhausen, Germany.
Department of Cardiothoracic and Thoracic Vascular Surgery, University Hospital Wuerzburg, Wuerzburg, Germany.

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Classifications MeSH