裙带菜膳食纤维对高血脂大鼠血管内皮功能的影响

目的研究裙带菜可溶性膳食纤维对高脂血症大鼠内皮功能的影响。方法40只大鼠分为4组(n=10):正常对照组,高脂模型组,膳食纤维低剂量组(5%),膳食纤维高剂量组(10%);经裙带菜可溶性膳食纤维处理8w后,检测离体血管的内皮依赖性舒张效应,血浆丙二醛(MDA),一氧化氮(NO),内皮素-1(ET-1)水平,并用Western blotting检测内皮型一氧化氮合酶(eNOS)蛋白表达水平。结果裙带菜可溶性膳食纤维显著降低MDA,ET-1水平,显著改善内皮功能及血浆NO的水平并伴随着eNOS蛋白表达水平的上调。结论裙带菜可溶性膳食纤维能改善高脂血症大鼠的血管内皮功能,这可能与其降低ET-1水平,增加NO的产生有关。

EFFECT OF UNDARIA PUNNATIFIDA DIETARY FIBER ON VASCULAR ENDOTHELIUM IN HYPERLIPI DEMIC RATS

Objective To test the effect of Undaria pinnatifida soluble dietary fiber on endothelial function in hyperlipidemic rats. Method Forty rats were divided into 4 groups(n=10) :control group,hyperlipidemic model group,low dose dietary fiber-treated group(5%) ,high dose dietary fiber-treated group(10%) . After treatment for 8 w. Endothelium-dependent vasorelaxation in isolated aortic rings,the content of plasma malondialdohyde(MDA) ,nitric oxide(NO) and endothelin-1(ET-1) were determined. The protein expression of endothelial NO synthase(eNOS) was measured by Western blotting. Results Undaria pinnatifida soluble dietary fiber treatment significantly decreased MDA and ET-1 level. It also significantly improved endothelial function and plasma NO level concomitantly with unregulation of the expression of eNOS protein. Conclusion In hyperlipidemic rats Undaria pinnatifida soluble dietary fiber could improve vascular endotheliual function,which might be explained by its action to decreasing plasma ET-1 level and increased NO production.