Equilibrative nucleoside transporter 1 plays an essential role in cardioprotection

Jennifer B. Rose, Zlatina Naydenova, Andrew Bang, Megumi Eguchi, Gary Sweeney, Doo Sup Choi, James R. Hammond, Imogen R. Coe

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

To better understand the role of equilibrative nucleoside transporters (ENT) in purine nucleosidedependent physiology of the cardiovascular system, we investigated whether the ENT1-null mouse heart was cardioprotected in response to ischemia (coronary occlusion for 30 min followed by reperfusion for 2 h). We observed that ENT1-null mouse hearts showed significantly less myocardial infarction compared with wild-type littermates. We confirmed that isolated wild-type adult mouse cardiomyocytes express predominantly ENT1, which is primarily responsible for purine nucleoside uptake in these cells. However, ENT1-null cardiomyocytes exhibit severely impaired nucleoside transport and lack ENT1 transcript and protein expression. Adenosine receptor expression profiles and expression levels of ENT2, ENT3, and ENT4 were similar in cardiomyocytes isolated from ENT1-null adult mice compared with cardiomyocytes isolated from wild-type littermates. Moreover, small interfering RNA knockdown of ENT1 in the cardiomyocyte cell line, HL-1, mimics findings in ENT1-null cardiomyocytes. Taken together, our data demonstrate that ENT1 plays an essential role in cardioprotection, most likely due to its effects in modulating purine nucleoside-dependent signaling and that the ENT1-null mouse is a powerful model system for the study of the role of ENTs in the physiology of the cardiomyocyte.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume298
Issue number3
DOIs
StatePublished - Mar 2010

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Equilibrative Nucleoside Transporter 1
Cardiac Myocytes
Purine Nucleosides
Nucleoside Transport Proteins
Purinergic P1 Receptors
Coronary Occlusion
Cardiovascular System
Nucleosides
Small Interfering RNA
Reperfusion
Ischemia
Myocardial Infarction
Cell Line

Keywords

  • Adenosine
  • Cardiomyocytes
  • Cardiovascular
  • Hypoxia

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)
  • Cardiology and Cardiovascular Medicine

Cite this

Equilibrative nucleoside transporter 1 plays an essential role in cardioprotection. / Rose, Jennifer B.; Naydenova, Zlatina; Bang, Andrew; Eguchi, Megumi; Sweeney, Gary; Choi, Doo Sup; Hammond, James R.; Coe, Imogen R.

In: American Journal of Physiology - Heart and Circulatory Physiology, Vol. 298, No. 3, 03.2010.

Research output: Contribution to journalArticle

Rose, Jennifer B. ; Naydenova, Zlatina ; Bang, Andrew ; Eguchi, Megumi ; Sweeney, Gary ; Choi, Doo Sup ; Hammond, James R. ; Coe, Imogen R. / Equilibrative nucleoside transporter 1 plays an essential role in cardioprotection. In: American Journal of Physiology - Heart and Circulatory Physiology. 2010 ; Vol. 298, No. 3.
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