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(Stroke. 2004;35:2676.)
© 2004 American Heart Association, Inc.

Articles

Delayed Adaptation of the Heart to Stress

Late Preconditioning

Adam B. Stein, MD; Xian-Liang Tang, MD; Yiru Guo, MD; Yu-Ting Xuan, PhD; Buddhadeb Dawn, MD Roberto Bolli, MD

From the Division of Cardiology and the Institute of Molecular Cardiology, University of Louisville, Louisville, Kentucky.

Correspondence to Dr Roberto Bolli, Division of Cardiology, University of Louisville, Louisville, KY 40292. E-mail rbolli{at}louisville.edu

The early phase of preconditioning (PC) lasts 2 to 3 hours and protects against myocardial infarction, but not against stunning. In contrast, the late phase of PC lasts for 3 to 4 days and protects against both myocardial stunning and infarction, making this phenomenon more clinically relevant. Late PC is a genetic reprogramming of the heart that involves the activation of several stress-responsive genes, which ultimately results in the development of a cardioprotective phenotype. Sublethal ischemic insults release chemical signals (nitric oxide [NO], adenosine, and reactive oxygen species) that trigger a series of signaling events (eg, activation of protein kinase C, Src protein tyrosine kinases, Janus kinases 1/2, and nuclear factor-B) and culminates in increased synthesis of inducible NO synthase, cyclooxygenase-2, heme oxygenase-1, aldose reductase, Mn superoxide dismutase, and probably other cardioprotective proteins. In addition to ischemia, heat stress, exercise, and cytokines can also induce a similar series of events. Perhaps most importantly, many pharmacologic agents (eg, NO donors, adenosine receptor agonists, endotoxin derivatives, or opioid receptor agonists) can mimic the effects of ischemia in inducing the late phase of PC, suggesting that this phenomenon might be exploited therapeutically. The purpose of this review is to summarize the mechanisms that underlie the late phase of ischemic PC.

Key Words: ischemic preconditioning • myocardial ischemia • myocardial reperfusion • nitric oxide

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