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Budas, Grant R; Disatnik, Marie-Hélène; Mochly-Rosen, Daria
Trends in cardiovascular medicine, 07/2009, Volume: 19, Issue: 5Journal Article
Abstract Mitochondrial aldehyde dehydrogenase 2 (ALDH2) is emerging as a key enzyme involved in cytoprotection in the heart. ALDH2 mediates both the detoxification of reactive aldehydes such as acetaldehyde and 4-hydroxy-2-nonenal and the bioactivation of nitroglycerin to nitric oxide. In addition, chronic nitrate treatment results in ALDH2 inhibition and contributes to nitrate tolerance. Our laboratory recently identified ALDH2 to be a key mediator of endogenous cytoprotection. We reported that ALDH2 is phosphorylated and activated by the survival kinase protein kinase C ɛ and found a strong inverse correlation between ALDH2 activity and infarct size. We also identified a small molecule ALDH2 activator which reduces myocardial infarct size induced by ischemia/reperfusion in vivo. In this review, we discuss evidence that ALDH2 is a key mediator of endogenous survival signaling in the heart, suggest possible cardioprotective mechanisms mediated by ALDH2 and discuss potential clinical implications of these findings.
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