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• W3162279013 abstract "Background Ischaemic preconditioning elicited by brief periods of coronary occlusion and reperfusion protects the heart from a subsequent prolonged ischaemic insult. Here, we test the hypothesis that short-term non-ischaemic stimulation of hypertrophy renders the heart resistant to subsequent ischaemic injury. Methods and Results Transient transverse aortic constriction (TAC) was performed for 3 days in mice and then withdrawn for 4 days by aortic debanding, followed by subsequent exposure to myocardial ischaemia-reperfusion (I/R) injury. Following I/R injury, myocardial infarct size and apoptosis were significantly decreased, and cardiac dysfunction was markedly improved in the TAC preconditioning group compared with the control group. Mechanistically, TAC preconditioning markedly suppressed I/R-induced autophagy and preserved autophagic flux by deacetylating SOD2 via a SIRT3-dependent mechanism. Moreover, treatment with an adenovirus encoding SIRT3 partially mimicked the effects of hypertrophic preconditioning, whereas genetic ablation of SIRT3 in mice blocked the cardioprotective effects of hypertrophic preconditioning. Furthermore, in vivo lentiviral-mediated knockdown of Beclin 1 in the myocardium ameliorated the I/R-induced impairment of autophagic flux and was associated with a reduction in cell death, whereas treatment with a lentivirus encoding Beclin 1 abolished the cardioprotective effect of TAC preconditioning. Conclusions The present study identifies TAC preconditioning as a novel strategy for induction of an endogenous self-defensive and cardioprotective mechanism against cardiac injury. Specifically, TAC preconditioning reduced myocardial autophagic cell death in a SIRT3/SOD2 pathway-dependent manner." @default.
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• W3162279013 date "2021-05-11" @default.
• W3162279013 modified "2023-10-17" @default.
• W3162279013 title "Hypertrophic Preconditioning Attenuates Myocardial Ischaemia‐Reperfusion Injury by Modulating SIRT3‐SOD2‐mROS‐Dependent Autophagy" @default.
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• W3162279013 doi "https://doi.org/10.1111/cpr.13051" @default.
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