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International Journal of Hypertension
Volume 2014 (2014), Article ID 565212, 8 pages
http://dx.doi.org/10.1155/2014/565212
Research Article

Long-Term Effect of an Aqueous Fraxinus excelsior L. Seed Extract in Spontaneously Hypertensive Rats

1Departmento de Farmacología, Facultad de Medicina, Universidad de Complutense, Avenida Complutense s/n, 28040 Madrid, Spain
2Instituto de Investigación en Ciencias de Alimentación (CIAL) (CSIC-UAM), C/Nicolás Cabrera, 9, 28049 Madrid, Spain

Received 20 September 2013; Accepted 10 January 2014; Published 18 February 2014

Academic Editor: Tomohiro Katsuya

Copyright © 2014 Noemi López-Carreras et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of long-term intake of different doses (20, 40, and 60 mg/kg/day) of a Fraxinus excelsior L. seed extract (FESE) on spontaneously hypertensive rats (SHR) was evaluated. Water was used as control and captopril (50 mg/kg/day) was used as positive control. Systolic blood pressure, body weight, and food and liquid intake were registered weekly in SHR. The antioxidant and vascular relaxing properties of FESE were also studied in these animals. The development of hypertension was attenuated in the groups treated with captopril or FESE. The antihypertensive effect was more accentuated in the captopril group than in the FESE groups, and it was paradoxically more accentuated in the groups treated with 20 mg/kg/day or 40 mg/kg/day of FESE than in the group treated with the highest dose of this extract. Body weight gain and food intake increased in the FESE groups. After removing the corresponding antihypertensive treatment, the arterial blood pressure and the body weight of the FESE treated animals returned to control values. In addition, FESE increased plasma antioxidant capacity and decreased plasma and liver malondialdehyde levels. Moreover, acetylcholine relaxation improved in the aorta rings from the FESE treated rats.