Journal
CIRCULATION
Volume 122, Issue 3, Pages 282-U132Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/CIRCULATIONAHA.110.953208
Keywords
aging; ischemia; myocardial infarction; signal transduction
Funding
- National Institutes of Health/National Institute on Aging [R03AG028163]
- American Heart Association National [SDG0835168N]
- American Federation for Aging Research [08007]
- National Institutes of Health/National Institute of Allergy and Infectious Diseases [R01AI04230]
- Brookdale Foundation
- Deutsche Forschungsgemeinschaft [(DFG)-FOR 809/TP1]
- American Diabetes Association [7-08-RA-130]
- National Natural Science Foundation of China [30700263]
- American Heart Association [09POST2250477]
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Background-Elderly patients are more sensitive than younger patients to myocardial ischemia, which results in higher mortality. We investigated how aging affects the cardioprotective AMP-activated protein kinase (AMPK) signaling pathway. Methods and Results-Ischemic AMPK activation was impaired in aged compared with young murine hearts. The expression and secretion of the AMPK upstream regulator, macrophage migration inhibitory factor (MIF), were lower in aged compared with young adult hearts. Additionally, the levels of hypoxia-inducible factor 1 alpha, a known transcriptional activator of MIF, were reduced in aged compared with young hearts. Ischemia-induced AMPK activation in MIF knockout mice was blunted, leading to greater contractile dysfunction in MIF-deficient than in wild-type hearts. Furthermore, intramyocardial injection of adenovirus encoding MIF in aged mice increased MIF expression and ischemic AMPK activation and reduced infarct size. Conclusions-An impaired MIF-AMPK activation response in senescence thus may be attributed to an aging-associated defect in hypoxia-inducible factor 1 alpha, the transcription factor for MIF. In the clinical setting, impaired cardiac hypoxia-inducible factor 1 alpha activation and consequent reduced MIF expression may play an important role in the increased susceptibility to myocardial ischemia observed in older cardiac patients. (Circulation. 2010; 122: 282-292.)
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