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Details

Autor(en) / Beteiligte
Titel
Analysis of the Role of Nitric Oxide in the Relaxant Effect of the Crude Extract and Fractions from Eugenia uniflora in the Rat Thoracic Aorta
Ist Teil von
  • Journal of pharmacy and pharmacology, 1997-04, Vol.49 (4), p.433-437
Ort / Verlag
Oxford, UK: Blackwell Publishing Ltd
Erscheinungsjahr
1997
Link zum Volltext
Quelle
MEDLINE
Beschreibungen/Notizen
  • This study has evaluated the possible role played by the l‐arginine‐nitric oxide pathway in the vasorelaxant action of the hydroalcoholic extract from Eugenia uniflora, and fractions from the extract, in rings of rat thoracic aorta. The addition of an increasing cumulative concentration of hydroalcoholic extract from E. uniflora (1–300 μg mL−1) caused a concentration‐dependent relaxation response in intact endothelium‐thoracic aorta rings pre‐contracted with noradrenaline (30–100 nm). The IC50 value, with its respective confidence limit, and the maximum relaxation (Rmax) were 7.02 (4.77–10.00) μg mL−1 and 83.94 ± 3.04%, respectively. The removal of the endothelium completely abolished these responses. The nitric oxide synthase inhibitors Nω‐nitro‐l‐arginine (l‐NOARG, 30 μm) and Nω‐nitro‐l‐arginine methyl ester (l‐NAME, 30 μm), inhibited the relaxation (Rmax) to −10.43 ± 7.81% and −3.69 ± 2.62%, respectively. In addition, l‐arginine (1 mm), but not d‐arginine (1 mm), completely reversed inhibition by l‐NOARG. Methylene blue (30 μm), a soluble guanylate cyclase inhibitor, reduced the relaxation induced by the extract to 14.60 ± 7.40%. These data indicate that in the rat thoracic aorta the hydroalcoholic extract, and its fractions, from the leaves of E. uniflora have graded and endothelium‐dependent vasorelaxant effects.

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