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• W2135965113 startingPage "1806" @default.
• W2135965113 abstract "Obstructive sleep apnea is associated with increased risk for cardiovascular diseases. As obstructive sleep apnea is characterized by episodic cycles of hypoxia and normoxia during sleep, we investigated effects of intermittent hypoxia (IH) on ischemia-reperfusion-induced myocardial injury. C57BL/6 mice were subjected to IH (2 min 6% O 2 and 2 min 21% O 2 ) for 8 h/day for 1, 2, or 4 wk; isolated hearts were then subjected to ischemia-reperfusion. IH for 1 or 2 wk significantly enhanced ischemia-reperfusion-induced myocardial injury. However, enhanced cardiac damage was not seen in mice treated with 4 wk of IH, suggesting that the heart has adapted to chronic IH. Ischemia-reperfusion-induced lipid peroxidation and protein carbonylation were enhanced with 2 wk of IH, while, with 4 wk, oxidative stress was normalized to levels in animals without IH. H 2 O 2 scavenging activity in adapted hearts was higher after ischemia-reperfusion, suggesting the increased antioxidant capacity. This might be due to the involvement of thioredoxin, as the expression level of this protein was increased, while levels of other antioxidant enzymes were unchanged. In the heart from mice treated with 2 wk of IH, ischemia-reperfusion was found to decrease thioredoxin. Ischemia-reperfusion injury can also be enhanced when thioredoxin reductase was inhibited in control hearts. These results demonstrate that IH changes the susceptibility of the heart to oxidative stress in part via alteration of thioredoxin." @default.
• W2135965113 created "2016-06-24" @default.
• W2135965113 creator A5030644327 @default.
• W2135965113 creator A5073197601 @default.
• W2135965113 date "2007-05-01" @default.
• W2135965113 modified "2023-09-26" @default.
• W2135965113 title "Effects of intermittent hypoxia on oxidative stress-induced myocardial damage in mice" @default.
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• W2135965113 doi "https://doi.org/10.1152/japplphysiol.01291.2006" @default.
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