Preclinical evaluation of the diuretic and saluretic effects of (-)-epicatechin and the result of its combination with standard diuretics - 20/09/18
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Graphical abstract |
Highlights |
• | This study shows the diuretic and saluretic actions of (-)-epicatechin (EPI) in rats. |
• | The combination with HCTZ strengthened EPI-induced diuresis. |
• | The treatment with amiloride plus EPI preserved the potassium-sparing effect. |
• | EPI-induced diuresis was precluded in the presence of a cyclooxygenase inhibitor. |
Abstract |
Several studies have suggested that (-)-epicatechin-containing foods and plant extracts benefit conditions that affect the cardiovascular system, such as hypertension and endothelial dysfunction. However, no study was conducted so far to evaluate the potential of this flavonoid on diuretic activity assay. For that, female Wistar normotensive (NTR) and spontaneously hypertensive rats (SHR) received a single oral treatment with (-)-epicatechin (EPI), hydrochlorothiazide (HCTZ) or just vehicle (VEH). The effects of EPI in combination with diuretics for clinical use, as well as with L-NAME, atropine and indomethacin were also explored. Cumulative urine volume, plasma and urinary parameters were evaluated at the end of 8 h experiment. When given to NTR and SHR, at doses of 0.3, 1 and 3 mg/kg, EPI was able to stimulate both diuresis and saluresis (Na+, K+ and Cl−), without interfering with plasma electrolyte content or urinary pH and uric acid values, when compared with VEH-treated only rats. The combination with HCTZ, but not with furosemide or amiloride, successfully strengthened EPI-induced diuresis. This effect was not accompanied by a potentiation of the saluretic effects. On the other hand, when given EPI in combination with amiloride, a significant increase in Cl− excretion and maintenance of the potassium-sparing effects characteristic of this class of diuretics were detected. In addition, the diuretic effect of EPI was enhanced after pretreatment with L-NAME and its action was significantly precluded in the presence of indomethacin, a cyclooxygenase inhibitor. In conclusion, this study shows the diuretic and saluretic properties of EPI in rats, adding another biological activity whose effect may contribute to the different positive actions already described.
El texto completo de este artículo está disponible en PDF.Keywords : Diuresis, Saluresis, Flavonoid, Flavanol, Prostanoids
Esquema
Vol 107
P. 520-525 - novembre 2018 Regresar al númeroBienvenido a EM-consulte, la referencia de los profesionales de la salud.
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