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  • Erlinge, David, et al. (författare)
  • Uridine triphosphate (UTP) is released during cardiac ischemia
  • 2005
  • Ingår i: Int J Cardiol. - : Elsevier BV. - 0167-5273. ; 100:3, s. 427-33
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND: Extracellular uridine triphosphate (UTP) stimulates vasodilatation, automaticity in ventricular myocytes and release of tissue-plasminogen activator (t-PA), indicating that UTP may be important in cardiac regulation. We took advantage of a recently developed quantitative assay for UTP to test the hypothesis that UTP is released in the circulation during cardiac ischemia. METHODS: In ten pigs, a balloon catheter in the left anterior descending artery was introduced to induce ischemia. Samples were collected from the coronary sinus. Blood flow in the coronary sinus was assessed by a Doppler velocity transducer. RESULTS: Plasma UTP levels increased early during ischemia and early after reperfusion (by 257+/-100 and 247+/-72%, p<0.05). Cardiac blood flow, ventricular arrhythmias and t-PA release were markedly increased at the same time points. In contrast, after 30 min, a second period of ischemia did not result in any significant increase of UTP or blood flow. Furthermore, ventricular arrhythmias were less frequent. UTP levels correlated with ventricular arrhythmia and blood flow. Similar results were found for ATP. CONCLUSION: For the first time we have shown that UTP is released during cardiac ischemia. UTP released during ischemia may stimulate blood flow, arrhythmia and t-PA release.
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