title: Erythropoietin receptor expression in adult rat cardiomyocytes is associated with an acute cardioprotective effect for recombinant erythropoietin during ischemia-reperfusion injury.
abstract: Erythropoietin (EPO), the principal hematopoietic cytokine that regulates mammalian erythropoiesis, exhibits diverse cellular effects in non-hematopoietic tissues. The physiologic functions of EPO are mediated by its specific cell-surface receptor EPOR. In this study, we demonstrate EPOR expression in adult rat cardiac myocytes and examine the direct effects of EPO on the heart to investigate whether recombinant EPO may exert an acute cardioprotective effect during ischemia-reperfusion injury. To determine whether EPO is cardioprotective, isolated rat hearts were perfused for 10 min in the Langendorff-mode with Krebs-Henseleit buffer in the absence or presence of brief recombinant EPO treatment while left-ventricular-developed pressure (LVDP) was measured continuously to assess contractile function. The hearts were then subjected to 20 min of normothermic global ischemia followed by 25 min of reperfusion. The post-ischemic recovery of LVDP in the untreated control hearts was 26 +/- 5% of their baseline LVDP, whereas hearts pretreated with EPO exhibited significantly improved post-ischemic recovery to 57 +/- 7%. We used 31P nuclear magnetic resonance (NMR) spectroscopy to determine whether modulation of intracellular pH and/or high-energy phosphate levels during ischemia contributed to EPO-mediated cardioprotection. These experiments revealed that the rapid cardioprotective effect of EPO during ischemia-reperfusion injury was associated with preservation of ATP levels in the ischemic myocardium.
authors.affiliation: Laboratory of Signal Transduction, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA.
authors.forename: Gary L
authors.initials: GL
authors.lastname: Wright
authors.forename: Paul
authors.initials: P
authors.lastname: Hanlon
authors.forename: Khalid
authors.initials: K
authors.lastname: Amin
authors.forename: Charles
authors.initials: C
authors.lastname: Steenbergen
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Murphy
authors.forename: Murat O
authors.initials: MO
authors.lastname: Arcasoy
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D002021:Buffers; D002316:Cardiotonic Agents / Q000494:pharmacology*; D004921:Erythropoietin / Q000494:pharmacology*; D006321:Heart / Q000187:drug effects / Q000503:physiopathology; D006439:Hemodynamics / Q000187:drug effects; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D009200:Myocardial Contraction / Q000187:drug effects; D009206:Myocardium / Q000166:cytology / Q000378:metabolism; D032383:Myocytes, Cardiac / Q000187:drug effects / Q000378:metabolism; D010477:Perfusion; D010725:Phosphocreatine / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D017467:Receptors, Erythropoietin / Q000235:genetics* / Q000378:metabolism*; D011994:Recombinant Proteins / Q000494:pharmacology; D015427:Reperfusion Injury / Q000503:physiopathology / Q000517:prevention & control*; D013997:Time Factors
chemical_list: D002021:Buffers; D002316:Cardiotonic Agents; D012333:RNA, Messenger; D017467:Receptors, Erythropoietin; D011994:Recombinant Proteins; D010725:Phosphocreatine; D004921:Erythropoietin; D000255:Adenosine Triphosphate