Whole-body leucine and lysine metabolism: response to dietary protein intake in young men.

Whole-body leucine and lysine metabolism: response to dietary protein intake in young men.
复制标题

全身亮氨酸和赖氨酸代谢:年轻男性对膳食蛋白质摄入量的反应。

DOI:
10.1152/ajpendo.1981.240.6.e712
复制
发表时间:
1981
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Young,VR
Young,VR
中科院分区:
--
文献类型:
--
作者:
Motil,KJ;Matthews,DE;Bier,DM;Burke,JF;Munro,HN;Young,VR

文献摘要

参考文献

被引文献

相似文献

全身亮氨酸和赖氨酸代谢在年轻成年男性中进行了探索,通过在4小时内持续静脉输注L-[1- 13 C]亮氨酸和L-[α-15 N]赖氨酸的混合物。受试者在过夜禁食(吸收后状态)或进食时进食(进食状态)后进行研究,这些受试者适应了提供过量蛋白质水平(1.5 g.kg body-1.day-1)、接近维持要求水平(边际摄入量)(0.6 g.kg body-1.day-1)或严重不足水平(0.1 g.kg-1.day-1)的饮食。蛋白质摄入量从边缘到过量水平的变化与亮氨酸通量增加和亮氨酸掺入体内蛋白质有关。在进食状态下,亮氨酸的氧化急剧增加,组织蛋白中亮氨酸的释放减少。当膳食蛋白质摄入量从需求减少到不足水平时,亮氨酸通量和身体蛋白质合成和蛋白质分解减少,同时亮氨酸氧化减少较少。[15 N]赖氨酸代谢的响应负责维持亮氨酸和其他必需氨基酸的经济性,并且它们似乎与受试者的氮和氨基酸需求有关。这些发现也表明了膳食的影响,由其蛋白质含量调制,对全身氨基酸代谢的动力学。
Whole-body leucine and lysine metabolism was explored in young adult men by a primed constant intravenous infusion of a mixture of L-[1–13C]leucine and L-[alpha-15N]lysine over a 4-h period. Subjects were studied after an overnight fast (postabsorptive state) or while consuming hourly meals (fed state) after adaptation to diets providing either a surfeit level of protein (1.5 g.kg body-1.day-1), a level approximating maintenance requirements (marginal intake) (0.6 g.kg body wt-1.day-1), or a grossly inadequate level (0.1 g.kg-1.day-1). The change in protein intake from a marginal to a surfeit level was associated with an increased leucine flux and incorporation of leucine into body protein. In the fed state, oxidation of leucine increased sharply and release of leucine from tissue protein diminished. When dietary protein intake was reduced from the requirement to inadequate level, leucine flux and body protein synthesis and protein breakdown were reduced, together with a smaller reduction in leucine oxidation. The response of the metabolism of [15N]lysine was responsible for maintenance of leucine and other essential amino acid economy, and they appear to be related to the nitrogen and amino acid requirements of the subject. These findings also demonstrate an effect of meals, modulated by their protein content, on the dynamics of whole-body amino acid metabolism.
人体蛋白质和能量代谢的昼夜模式
DOI: --
发表时间: 1980
期刊:
影响因子: --
作者:
P. Garlick;G. Clugston;R. W. Swick;J. Waterlow
通讯作者: J. Waterlow
用于测定血浆赖氨酸中 15N 富集的快速微量方法:应用于测量全身蛋白质周转率。
DOI: --
发表时间: 1979
影响因子: 2.9
作者:
D. Bier;H. Christopherson
通讯作者: H. Christopherson
组氨酸摄入量和肝组氨酸酶活性对组氨酸体内代谢的影响。
DOI: --
发表时间: 1977
期刊: Journal of NutriLife
影响因子: --
作者:
Y. A. Kang;A. Harper
通讯作者: A. Harper
DOI: --
发表时间: 1976
影响因子: 7.1
作者:
W. Rand;V. Young;N. Scrimshaw
通讯作者: N. Scrimshaw
DOI: --
发表时间: 1979
期刊: Journal of NutriLife
影响因子: --
作者:
E. A. Oddoye;S. Margen
通讯作者: S. Margen