Dietary Alpha-Linolenic Acid Inhibits Angiotensin-Converting Enzyme Activity and mRNA Expression Levels in the Aorta of Spontaneously Hypertensive Rats

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書誌事項

公開日
2009
資源種別
journal article
DOI
  • 10.5650/jos.58.355
公開者
公益社団法人 日本油化学会

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説明

Several studies have shown that dietary alpha-linolenic acid (ALA) is associated with a reduced risk of cardiovascular disease and has an antihypertensive effect. Blood pressure is regulated mainly by angiotensin-converting enzyme (ACE). In the present study, we investigated the effect of dietary ALA on ACE to clarify the mechanism of the antihypertensive effect in spontaneously hypertensive rats (SHR). Six-week-old SHR were fed a diet containing either 10% ALA-rich flaxseed oil or high oleic safflower oil as a control for four weeks. Systolic blood pressure (SBP) was measured by the tail cuff method once weekly. At the end of the feeding period, ACE activity was determined in the heart, aorta, lung and kidney. ACE mRNA in these organs was also measured by real-time PCR analysis. SBP in the ALA group was significantly lower than in the control group at 2, 3, and 4 weeks. The ACE activity and mRNA expression levels in the ALA group were significantly lower than in the control only in the aorta. In conclusion, the present findings suggest that the blood pressure-lowering mechanism of dietary ALA may be involved in the reduction of ACE activity and mRNA expression levels in the aorta of SHR.

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