Acute erythropoietin cardioprotection is mediated by endothelial response

Ruifeng Teng, John W. Calvert, Nathawut Sibmooh, Barbora Piknova, Norio Suzuki, Junhui Sun, Kevin Martinez, Masayuki Yamamoto, Alan N. Schechter, David J. Lefer, Constance Tom Noguchi

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51 Scopus citations


Increasing evidence indicates that high levels of serum erythropoietin (Epo) can lessen ischemia-reperfusion injury in the heart and multiple cardiac cell types have been suggested to play a role in this Epo effect. To clarify the mechanisms underlying this cardioprotection, we explored Epo treatment of coronary artery endothelial cells and Epo cardioprotection in a Mus musculus model with Epo receptor expression restricted to hematopoietic and endothelial cells (ΔEpoR). Epo stimulation of coronary artery endothelial cells upregulated endothelial nitric oxide synthase (eNOS) activity in vitro and in vivo, and enhanced nitric oxide (NO) production that was determined directly by real-time measurements of gaseous NO release. Epo stimulated phosphoinositide 3-kinase (PI3K)/protein kinase B (AKT) and mitogen-activated protein kinase kinase (MEK)/extracellular signal regulated kinase (ERK) signaling pathways, and inhibition of PI3K, but not MEK activity, blocked Epo-induced NO production. To verify the potential of this Epo effect in cardioprotection in vivo, ΔEpoR-mice with Epo response in heart restricted to endothelium were treated with Epo. These mice exhibited a similar increase in eNOS phosphorylation in coronary artery endothelium as that found in wild type (WT) mice. In addition, in both WT- and ΔEpoR-mice, exogenous Epo treatment prior to myocardial ischemia provided comparable protection. These data provide the first evidence that endothelial cell response to Epo is sufficient to achieve an acute cardioprotective effect. The immediate response of coronary artery endothelial cells to Epo stimulation by NO production may be a critical mechanism underlying this Epo cardioprotection.

Original languageEnglish
Pages (from-to)343-354
Number of pages12
JournalBasic Research in Cardiology
Issue number3
StatePublished - May 2011
Externally publishedYes


  • Endothelial cells
  • Endothelial nitric oxide synthase
  • Ischemia
  • Myocardial infarction
  • Nitric oxide


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