Role of NADPH oxidase isoforms NOX1, NOX2 and NOX4 in myocardial ischemia/reperfusion injury.
Myocardial reperfusion injury is mediated by several processes including increase of reactive oxygen species (ROS). The aim of the study is to identify potential sources of ROS contributing to myocardial ischemia-reperfusion injury. For this purpose, we investigated myocardial ischemia/reperfusion pathology in mice deficient in various NADPH oxidase isoforms (Nox1, Nox2, Nox4, as well as Nox1/2 double knockout). Following 30min of ischemia and 24h of reperfusion, a significant decrease in the size of myocardial infarct was observed in Nox1-, Nox2- and Nox1/Nox2-, but not in Nox4-deficient mice. However, no protection was observed in a model of chronic ischemia, suggesting that NOX1 and NOX2-mediated oxidative damage occurs during reperfusion. Cardioprotective effect of Nox1 and Nox2 deficiencies was associated with decrease of neutrophil invasion, but, on the other hand an improved reperfusion injury was also observed in isolated perfused hearts (Langendorff model) suggesting that inflammatory cells were not the major source of oxidative damage. A decrease in global post-reperfusion oxidative stress was clearly detected in Nox2-, but not in Nox1-deficient hearts. Analysis of key signaling pathways during reperfusion suggests distinct cardioprotective patterns: increased phosphorylation was seen for Akt and Erk in Nox1-deficient mice and for Stat3 and Erk in Nox2-deficient mice. Consequently, NOX1 and NOX2 represent interesting drug targets for controlling reperfusion damage associated with revascularization in coronary disease.
Division of Cardiology, Department of Medicine, University Hospital, Foundation for Medical Researches, 64 Avenue Roseraie, 1211 Geneva, Switzerland; Division of Clinical Pathology, Department of Genetic Medicine and Laboratories, University Hospital, 1 rue Michel-Servet, 1211 Geneva, Switzerland. Electronic address: vincent.braunersreuther@hcuge.ch.
Vincent
V
Braunersreuther
Fabrizio
F
Montecucco
Mohamed
M
Asrih
Mohammed
M
Ashri
Graziano
G
Pelli
Katia
K
Galan
Miguel
M
Frias
Fabienne
F
Burger
Ana Luíza Gomez
AL
Quinderé
Christophe
C
Montessuit
Karl-Heinz
KH
Krause
François
F
Mach
Vincent
V
Jaquet
D000818:Animals; D016207:Cytokines / Q000097:blood; D004195:Disease Models, Animal; D007527:Isoenzymes; D008264:Macrophages / Q000473:pathology; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics* / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D015428:Myocardial Reperfusion Injury / Q000235:genetics* / Q000378:metabolism / Q000473:pathology / Q000517:prevention & control; D009206:Myocardium / Q000378:metabolism / Q000473:pathology; D009247:NADH, NADPH Oxidoreductases / Q000235:genetics* / Q000378:metabolism; D000074624:NADPH Oxidase 1; D000074662:NADPH Oxidase 2; D000074663:NADPH Oxidase 4; D019255:NADPH Oxidases / Q000235:genetics* / Q000378:metabolism; D020556:Neutrophil Infiltration / Q000235:genetics; D010766:Phosphorylation; D017382:Reactive Oxygen Species / Q000378:metabolism; D015398:Signal Transduction
D016207:Cytokines; D007527:Isoenzymes; D008562:Membrane Glycoproteins; D017382:Reactive Oxygen Species; D009247:NADH, NADPH Oxidoreductases; C488842:Cybb protein, mouse; D000074624:NADPH Oxidase 1; D000074662:NADPH Oxidase 2; D000074663:NADPH Oxidase 4; D019255:NADPH Oxidases; C000614711:NOX1 protein, mouse; C422943:Nox4 protein, mouse
Myocardial ischemia; NADPH oxidase; NOX; ROS; Reperfusion injury