Efeitos protetores do ácido elágico sobre as lesões cardiovasculares causadas pela hipertensão em ratos
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2016-07-07
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Universidade Federal de Goiás
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Ellagic acid (EA) is a natural phenol found in many fruits, mainly in red fruits and nuts, which possessess antioxidant and antiproliferative properties. Hence, it was hypothesized that EA could improve the cardiovascular damage caused by hypertension. Hypertension was induced in male Wistar rats with L-NAME (60 mg/Kg/day in drinking water) for six weeks. EA was administered (10 or 30 mg/Kg/day) by gavage starting on the second week of hypertension induction until the end of the sixth week. The control group received only vehicle. The blood pressure was recorded every week by tail-cuff plethysmography. After six weeks, the rats were euthanized and the heart and kidney were removed and weighed in comparison with the body weight. The blood was collected in heparin vaccum tubes to nitrite/nitrate and alkaline phosphatase analysis. Aortas were isolated and cut into rings for isometric recordings in an organ bath and for histological assay with hematoxylin/eosin to evaluate vascular remodeling. The abdominal aorta was used for calcium quantification analysis. The high level of blood pressure (233.6±9.5 mmHg) was reduced (p<0.01) by treatment with AE 10 or 30 mg/Kg (194.3±11.8 and 183.1±8.3 mmHg, respectively). The plasmatic levels of nitrate/nitrite (NO metabolites) were reduced (p<0.05) in hypertensive rats and were
restored with the EA treatment. The vascular relaxations to acetylcholine and sodium nitoprusside and the contraction to phenylephrine were impaired in hypertensive group and they were improved after EA treatment. The plasmatic levels of alkaline phosphatase in the hypertensive group were increased and returned to control levels after EA treatment. In the aorta, the EA treatment resulted in lesser aortic wall thickening and lesser calcification. EA attenuates hypertension possibly improving the NO biodisponibility. The vascular response to acetylcholine, sodium nitroprusside and phenylephrine were impaired by hypertension and improved after treatment with EA. Moreover, alkaline phosphatase levels, calcium content and hypertrophy in aortas during hypertension were attenuated by treatment with EA.
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JORDÃO, J. B. R. Efeitos protetores do ácido elágico sobre as lesões cardiovasculares causadas pela hipertensão em ratos. 2016. 74 f. Dissertação (Mestrado em Ciências Farmacêuticas) - Universidade Federal de Goiás, Goiânia, 2016.