1. Role of pannexin and adenosine triphosphate (ATP) following myocardial ischemia/reperfusion.
- Author
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Kristiansen SB, Skovsted GF, Berchtold LA, Radziwon-Balicka A, Dreisig K, Edvinsson L, Sheykhzade M, and Haanes KA
- Subjects
- Animals, Connexins genetics, Coronary Vessels physiopathology, Disease Models, Animal, Myocardial Infarction genetics, Myocardial Infarction physiopathology, Myocardial Reperfusion Injury genetics, Myocardial Reperfusion Injury physiopathology, Nerve Tissue Proteins genetics, Paracrine Communication, Rats, Sprague-Dawley, Receptors, Purinergic P2Y2 metabolism, Signal Transduction, Adenosine Triphosphate metabolism, Connexins metabolism, Coronary Vessels metabolism, Myocardial Infarction metabolism, Myocardial Reperfusion Injury metabolism, Myocardium metabolism, Nerve Tissue Proteins metabolism, Vasoconstriction
- Abstract
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.
- Published
- 2018
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