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• W2068049473 abstract "Objective: Mitochondrial biology appears central to many conditions that progress to death but remains poorly characterized after cardiac arrest. Mitochondrial dysfunction in electron transfer and reactive oxygen species leakage during ischemia may lead to downstream events including mitochondrial protein oxidation, tyrosine nitrosylation, cytochrome c loss, and eventual death. We sought to better define early fixed alterations in these mitochondrial functions after whole animal cardiac arrest. Methods: We used a murine model of 8 mins of untreated KCl-induced cardiac arrest followed by resuscitation and return of spontaneous circulation to study mitochondrial functions in four groups of animals: 1) after 8 min cardiac arrest (CA8) but no resuscitation, 2) 30 min postreturn of spontaneous circulation (R30), 3) 60 min postreturn of spontaneous circulation (R60), and in 4) shams. Heart mitochondria were immediately harvested, isolated, and stored at −80°C for later spectrophotometric measurements of electron transfer activities and reactive oxygen species leakage using appropriate substrates and inhibitors. Mitochondrial cytochrome c content and tyrosine nitration were analyzed by Western blot and densitometry. Results: A significant reactive oxygen species leakage from complex I was evident after just 8 min of cardiac arrest (CA8 group, p < .05), which was followed by a progressive reduction in complex I electron transfer activity (CA8 > R30 > R60). In contrast, complex II and II–III activities appeared more resistant to ischemia at the time points evaluated. Early changes in a ∼50 kDa and ∼25 kDa protein were observed in tyrosine nitration along with a loss of cytochrome c. Conclusions: A relatively “orderly” process of mitochondrial dysfunction progresses during ischemia and reperfusion. Changes in mitochondrial reactive oxygen species generation and electron transfer from complex I occur along with tyrosine nitrosylation and loss of cytochrome c; these may represent important new targets for future human therapies." @default.
• W2068049473 created "2016-06-24" @default.
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• W2068049473 date "2008-11-01" @default.
• W2068049473 modified "2023-10-17" @default.
• W2068049473 title "Early mitochondrial dysfunction in electron transfer activity and reactive oxygen species generation after cardiac arrest" @default.
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• W2068049473 doi "https://doi.org/10.1097/ccm.0b013e31818a8a51" @default.
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