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Physiology and Pharmacology، جلد ۱۰، شماره ۱، صفحات ۷۱-۷۷
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عنوان انگلیسی Study on mechanism of vasorelaxatory effect of Vitis vinifera leaf extract in rat aorta
چکیده انگلیسی مقاله Introduction: Our previous studies showed that hydroalcoholic extract of leaf of Vitis vinifera relaxes the phenylephrine-induced contraction in rat thoracic aorta. This effect was dependent on endothelial integrity and NO-cGMP system. The vasorelaxant effect of extract was much lesser on KCl-induced contraction. We, therefore, postulated that K+ channels are involved. The main aim of the present study was to determine the type of K+ channels involved in this vasorelaxant effect. Methods: Thoracic aorta with intact endothelium was removed from adult male Wistar rats (170-220g). The aorta was mounted in an organ bath containing Krebs-Henseleit (37 ºC, pH 7.4) bubbled with O2. Aortic contractions were recorded isometrically under 1 g resting tension. The aorta endothelium was considered intact if acetylcholine (1 μM) could induce more than 70% aorta relaxation on 1μM phenylephrine-induced contraction. Extract was prepared by maceration method using 70% alcohol and the solvent was then evaporated. Results: The results showed that in the presence of tetraethylammonium (10 mM), the vasorelaxant effect of extract (0.25, 0.5, 1 and 2 mg/ml) was reduced (P< 0.001, n=7). In contrast, glibenclamide (1 μM) had no effect. In calcium-free (plus 0.1 mM of EDTA) Krebs-Henseleit solution, the vasorelaxant effect of extract (0.25, 0.5 and 1 mg/ml) was reduced (P< 0.0001, n=8). Furthermore, the vasorelaxant effect of extract was unaffected by indomethacin (1 μM). Conclusion: These results suggest that Vitis vinifera leaf hydroalcoholic extract induces relaxation in rat aorta possibly by opening the Ca2+ -operated K+ channels but, not ATP- sensitive K+ channels and extracellular calcium was essential for inducing vasorelaxation by extract. Furthermore, cyclooxigenase was not involved in this vasorelaxant effect.
کلیدواژه‌های انگلیسی مقاله Vitis vinifera, Rat, Aorta, K+ channels.
نویسندگان مقاله محمد کاظم غریب ناصری | mohammad kazem gharib naseri
dept. of physiology, medical school, ahwaz jundshapur university of medical sciences, ahwaz, iran


اکبر حیدری | akbar heidari


نشانی اینترنتی http://www.phypha.ir/ppj/browse.php?a_code=A-10-110-28&slc_lang=en&sid=en
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کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده Cardivascular system
نوع مقاله منتشر شده Original Research
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