کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5830335 | 1559025 | 2011 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Coronary response to diadenosine tetraphosphate after ischemia-reperfusion in the isolated rat heart
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب سلولی و مولکولی
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چکیده انگلیسی
Diadenosine tetraphosphate (AP4A) is a vasoactive mediator that may be released from platelet granules and that may reach higher plasma concentrations during coronary ischemia-reperfusion. The objective of this study was to analyze its coronary effects in such conditions. To this, rat hearts were perfused in a Langendorff preparation and the coronary response to Ap4A (10â 7-10â 5 M) was recorded. In control hearts, Ap4A produced concentration-dependent vasodilatation both at the basal coronary resting tone and after precontracting coronary vasculature with 11-dideoxy-1a,9a-epoxymethanoprostaglandin F2α (U46619), and this vasodilatation was reduced by reactive blue 2 (2 Ã 10â 6 M), glibenclamide (10â 5 M), H89 (10â 6 M), U73122 (5 Ã 10â 6 M) and endothelin-1 (10â 9 M), but not by L-NAME (10â 4 M), isatin (10â 4 M), GF109203x (5 Ã 10â 7 M), or wortmannin (5 Ã 10â 7 M). After ischemia-reperfusion, the vasodilatation to Ap4A diminished, both in hearts with basal or increased vascular tone, and in this case the relaxation to Ap4A was not modified by reactive blue 2, L-NAME, glibenclamide, isatin, H89, GF109203x or wortmannin, although it was reduced by U73122 and endothelin-1. UTP produced coronary relaxation that was also reduced after ischemia-reperfusion. These results suggest that the coronary relaxation to Ap4A is reduced after ischemia-reperfusion, and that this reduction may be due to impaired effects of KATP channels and to reduced response of purinergic P2Y receptors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Pharmacology - Volume 660, Issues 2â3, 25 June 2011, Pages 394-401
Journal: European Journal of Pharmacology - Volume 660, Issues 2â3, 25 June 2011, Pages 394-401
نویسندگان
Angel Luis GarcÃa-Villalón, Nuria Fernández, Luis Monge, Godofredo Diéguez,