Circulation. 2003;108:79-85
Published online before print June 9, 2003, doi: 10.1161/01.CIR.0000078635.89229.8A
Published online before print June 9, 2003, doi: 10.1161/01.CIR.0000078635.89229.8A
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(Circulation. 2003;108:79.)
© 2003 American Heart Association, Inc.
Basic Science Reports |
Hearts From Rodents Exposed to Intermittent Hypoxia or Erythropoietin Are Protected Against Ischemia-Reperfusion Injury
From the McKusick-Nathans Institute of Genetic Medicine (Z.C., D.J.M., G.L.S.), Division of Cardiology, Department of Medicine (G.W., J.L.Z.), and Department of Pathology (E.R.R., K.F.-T.), Johns Hopkins University School of Medicine, Baltimore, Md.
Correspondence to Dr Gregg L. Semenza, 600 N Wolfe St, CMSC-1004, Baltimore, MD 21287-3914. E-mail gsemenza{at}jhmi.edu
Received April 2, 2003; revision received May 9, 2003; accepted May 9, 2003.
Background— Preconditioning phenomena provide evidence for adaptive responses to ischemia that have important implications for treatment/prevention of myocardial infarction. Hypoxia-inducible factor 1 (HIF-1) mediates adaptive transcriptional responses to hypoxia/ischemia.
Methods and Results— Exposure of wild-type mice to intermittent hypoxia resulted in protection of isolated hearts against ischemia-reperfusion injury 24 hours later. Cardiac protection induced by intermittent hypoxia was lost in Hif1a+/- mice heterozygous for a knockout allele at the locus encoding HIF-1
. Erythropoietin (EPO) mRNA expression was induced in kidneys of wild-type mice subjected to intermittent hypoxia, resulting in increased plasma EPO levels. EPO mRNA expression was not induced in Hif1a+/- mice. EPO administration to rats increased functional recovery and decreased apoptosis in isolated hearts subjected to ischemia-reperfusion 24 hours later.
Conclusions— Hearts isolated from rodents subjected to intermittent hypoxia or EPO administration are protected against postischemic injury. Cardiac protection induced by intermittent hypoxia is critically dependent on Hif1a gene dosage. Our data suggest that additional studies to evaluate therapeutic applications of EPO administration are warranted.
Key Words: hypoxia • ischemia • myocardial infarction
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