کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2531292 1558911 2015 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
ATP is not involved in α1-adrenoceptor-mediated vasoconstriction in resistance arteries
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب سلولی و مولکولی
پیش نمایش صفحه اول مقاله
ATP is not involved in α1-adrenoceptor-mediated vasoconstriction in resistance arteries
چکیده انگلیسی

Recent publications suggest that α1-adrenoceptor stimulation by exogenous agonists such as phenylephrine in resistance arteries cause contraction through the release of ATP from within the vascular smooth muscle cells. This ATP exits the cell through pannexin-1 channels to act back “autocrine-like” on P2 receptors on the smooth muscle that cause the contraction. In this work we directly test this hypothesis by using a selective P2X1 purinoceptor antagonist NF449 (1–10 µM) against phenylephrine and ATP concentration–response curves in small mesenteric arteries of the rat and thoracodorsal arteries of the mouse. We show that NF449 is a simple competitive antagonist of ATP with a pKB of 6.43 and 6.41 in rat and mouse arteries, respectively, but did not antagonise phenylephrine concentration–response curves. This work cautions against the growing overstated role of the reputed pannexin-1/ATP release axis following α1-adrenoceptor activation in small resistance arteries.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Pharmacology - Volume 769, 15 December 2015, Pages 162–166
نویسندگان
, ,