JACC:膳食限钠改善内皮功能障碍

2012-11-20 JACC JACC

  美国学者的一项研究表明,膳食限钠(DSR)可在很大程度上逆转大血管和微血管的内皮功能障碍;主要机制为增强一氧化氮(NO)/四氢生物喋呤(BH4)生物利用度。论文于2012年10月25日在线发表于《美国心脏病学会杂志》(J Am Coll Cardiol)。   此项研究共纳入17例受试者,其中男、女性分别为11和6例,平均年龄为(62±7)岁。受试者随机交叉完成

  美国学者的一项研究表明,膳食限钠(DSR)可在很大程度上逆转大血管和微血管的内皮功能障碍;主要机制为增强一氧化氮(NO)/四氢生物喋呤(BH4)生物利用度。论文于2012年10月25日在线发表于《美国心脏病学会杂志》(J Am Coll Cardiol)。

  此项研究共纳入17例受试者,其中男、女性分别为11和6例,平均年龄为(62±7)岁。受试者随机交叉完成为期4周的DSR和正常摄钠试验。在不同摄钠情况后对血管内皮功能(内皮依赖性舒张;EDD)、一氧化氮(NO)/四氢生物喋呤(BH4)生物利用度和氧化应激相关机制进行评估。

  结果显示,DSR之后尿钠外排约减少50%,并且通道(肱动脉血流介导舒张[FMDBA])和阻力[前臂血流量对乙酰胆碱反应(FBFACh)]动脉EDD分别升高68%和42%(P<0.005)。低钠在未改变内皮NO合成酶表达/激活的情况下显著增强了NO介导的EDD,恢复了BH4生物利用度,消除了EDD超氧化物抑制,并且增强了循环超氧化物歧化酶活性(P<0.05)。上述效应独立于收缩压变化。

  链接:

Jablonski KL, Racine ML, Geolfos CJ, Gates PE, Chonchol M, McQueen Scd MB, Seals DR.Dietary Sodium Restriction Reverses Vascular Endothelial Dysfunction in Middle-Aged/Older Adults With Moderately Elevated Systolic Blood Pressure.J Am Coll Cardiol. 2012 Oct 25. pii: S0735-1097(12)04635-9. doi: 10.1016/j.jacc.2012.09.010


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    2012-12-21 hbwxf
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    2012-11-22 zhaojie88
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