Dietary n-3 polyunsaturated fatty acids affect the development of renovascular hypertension in rats

The consequences of a dietary n-3 PUFA supply was investigated on the blood pressure (BP) increase elicited by left renal artery stenosis in rats dist ributed in 3 groups (n = 8) fed for 8 weeks a semi-purified diet either as control diet or enriched diets (docosahexaenoic acid, DHA, or eicosapentaen oic acid, EPA). The PUFA intake induced large alterations in heart and kidn ey phospholipid fatty acid profile, but did not influence body weight, card iac hypertrophy, renal left atrophy and right hypertrophy. Within 4 weeks, BP raised from 120-180 +/- 2 mm Hg in the control group, but only to 165 +/ - 3 mm Hg in the n-3 PUFA groups. After stabilization of BP in the 3 groups , the rats received a short administration of increasing dose of perindopri l. The lower dose (0.5 mg/kg) moderately decreased BP only in the control g roup. With higher doses (1, 5 and 10 mg/kg) BP was normalized in the 3 grou ps, with a higher amplitude of the BP lowering effect in the control group. A moderate n-3 PUFA intake can contribute to prevent the development of pe ripheral hypertension in rats by a mechanism that may involve angiotensin c onverting enzyme.