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- W1994429206 abstract "A long-term “memory” of hyperglycemic stress, even when glycemia is normalized, has been previously reported in diabetes. In this report we propose a similar hypothesis that exposure to continuous high angiotensin II (Ang II) results in a cellular “memory” in isolated cardiomyocytes and in the heart tissues, and we investigate the role of NADPH oxidases in this phenomenon. Continuous high Ang II for 3 days markedly increased cardiomyocyte size, TUNEL-positive apoptotic cardiomyocytes, expression of inflammatory cytokines, and oxidative stress. These deleterious effects were also observed in the memory condition (high Ang II for 2 days followed by normal medium for 1 day). Furthermore, in a mouse model, Ang II infusion for 3 weeks significantly increased cardiac hypertrophy, apoptosis, inflammation, and ROS generation but decreased cardiac function compared with control mice, and similar effects were also observed in mice in the memory condition. Importantly, blockade of NADPH oxidase using apocynin diminished the induction of high Ang II stress markers in isolated cardiomyocytes and in the mouse heart. These effects were associated with inhibition of NADPH oxidase-mediated AKT/mTOR/S6K and ERK signaling pathways. The present results demonstrate the hypothesis that exposure to continuous high Ang II results in a hypertensive cellular memory that remains, even when cells or mice are switched back to normal Ang II. This phenomenon was associated with NADPH oxidase-mediated oxidative stress." @default.
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- W1994429206 date "2013-12-01" @default.
- W1994429206 modified "2023-10-16" @default.
- W1994429206 title "NADPH oxidases mediate a cellular “memory” of angiotensin II stress in hypertensive cardiac hypertrophy" @default.
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- W1994429206 doi "https://doi.org/10.1016/j.freeradbiomed.2013.08.179" @default.
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