期刊
JOURNAL OF HYPERTENSION
卷 26, 期 1, 页码 44-52出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/HJH.0b013e3282f09f68
关键词
aorta; hypertension; magnesium intake; pulse pressure; wall stiffness; wall thickness
Objective The present study aimed to show whether longterm moderate magnesium (Mg)-deficient (150mg/kg) and Mg-supplemented (3200mg/kg) diets (versus control diet: 800mg/kg), modified the occurrence of cardiovascular risk induced by aging in the rat. Methods Cardiovascular and arterial functions were determined by a systemic hemodynamic study and by ex vivo measurements of vasoconstriction and endothelium dependent-vasorelaxation. Arterial wall structure was determined using pressure myograph chamber and histomorphometric methods. Results The main changes observed in old rats (96 weeks old) fed a control diet, in comparison to adult rats (16 weeks old) were increased pulse pressure, a loss of aortic endothelium-dependent relaxation, increased aortic wall thickness and a decrease of the aortic wall elastin/collagen ratio. Long-term moderate Mg deficiency progressively increased systolic blood pressure. Intra-arterial pulse pressure was higher in Mg-deficient old rats than in age-matched control rats. Histological examination showed that Mg deficiency increased the age-induced deleterious effects on composition and structure of aorta (media thickness, increased collagen content and reduction in the elastin/collagen ratio), which lead to large artery rigidity. Hypertension and increased pulse pressure may have contributed to the increase in the mortality rate observed in the hypertensive Mg-deficient group. Although the long-term Mg-supplemented diet lowered blood pressure and decreased the mortality rate, it had no significant effect on aortic wall thickening and stiffening. Conclusion It is suggested that a long-term and moderate Mg-deficient diet increases age-induced arterial thickness and stiffness in rats, and thus increases the cardiovascular risks incurred by aging.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据