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The Capital Region of Denmark - a part of Copenhagen University Hospital
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Role of Pannexin and adenosine triphosphate (ATP) following myocardial ischemia/reperfusion

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OBJECTIVES: The purinergic system has not been investigated in detail following ischemia/reperfusion (I/R) injury in the heart. In the present study we focus on both release and response to extracellular adenosine triphosphate (ATP). Pannexin (Panx) channels have been shown to be involved in ATP release from myocytes and can activate P2X1 and P2Y2 receptors on the coronary artery.

DESIGN: We applied a well characterized I/R model in rats, with 24 hours of reperfusion. Panx expression in the myocardial tissue was measured with quantitative polymerase chain reaction (qPCR) and flow cytometry. ATP release was detected in situ using luminescence and the vascular response to nucleotides determined in a wire myograph.

RESULTS: Here we show that Panx expression is increased after experimental myocardial I/R, leading to an increase in extracellular ATP release, which could be inhibited by probenecid. Functional studies revealed that the P2Y2 receptor dependent contraction is reduced in the coronary artery after I/R, which might be a response to the increased ATP levels.

CONCLUSION: We therefore, conclude that the regulation of the arterial purinergic system minimizes coronary contractions following ischemia.

Original languageEnglish
JournalScandinavian cardiovascular journal : SCJ
Volume52
Issue number6
Pages (from-to)340-343
Number of pages4
ISSN1401-7431
DOIs
Publication statusPublished - 2018

    Research areas

  • Ischemia/reperfusion, coronary artery, myograph, pannexin, purinergic receptors, Paracrine Communication, Signal Transduction, Vasoconstriction, Adenosine Triphosphate/metabolism, Rats, Sprague-Dawley, Myocardial Infarction/genetics, Animals, Connexins/genetics, Myocardium/metabolism, Nerve Tissue Proteins/genetics, Receptors, Purinergic P2Y2/metabolism, Myocardial Reperfusion Injury/genetics, Coronary Vessels/metabolism, Disease Models, Animal

ID: 55802007