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LOCAL CONTROL OF CIRCULATION

ATP stimulates the release of prostacyclin from perfused veins isolated from the hamster hindlimb

¹Department of Physiology and Pharmacology, West Virginia University School of Medicine, Morgantown, West Virginia 26506-9229; and ²Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, Mississippi 39216-4505

Submitted 2 August 2002 ; accepted in final form 13 March 2003

ATP-stimulated prostacyclin release from veins was investigated using epigastric veins isolated from hamsters. Veins were perfused with MOPS-buffered physiological salt solution (PSS). ATP was administered into the perfusate, and the bath solution (MOPS-PSS) was collected and assayed for the presence of the stable prostacyclin metabolite 6-keto-PGF₁. ATP (100 µM) resulted in reproducible increases in bath concentration from 73 ± 22 to 279 ± 50 pg/ml (P < 0.05, n = 5). This response was abolished by indomethacin (10 µM, P < 0.05). To ascertain whether the endothelium was the source of prostacyclin, endothelium was disrupted using air (n = 10) or deoxycholic acid (n = 6). Perfusion with air significantly reduced (P < 0.05) but did not completely abolish ATP-stimulated release of prostacyclin, while deoxycholic acid totally abolished the response (P < 0.05). The nonselective P2 receptor antagonist reactive blue 2 (100 µM) attenuated ATP-mediated release of prostacyclin but did not significantly alter ACh-stimulated release of prostacyclin. The nonselective adenosine receptor antagonist xanthine amine congener (1 µM) had no effect on ATP-stimulated release, and adenosine did not stimulate the release of prostacyclin. These results show that increases in intraluminal concentration of ATP stimulate abluminal release of prostacyclin from the venous endothelium. This effect is mediated by P2 receptors while adenosine and its receptors are not involved in this response.

prostaglandins; P2Y receptor; cyclooxygenase

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