Response of alanine metabolism in humans to manipulation of dietary protein and energy intakes.

Response of alanine metabolism in humans to manipulation of dietary protein and energy intakes.
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人类丙氨酸代谢对膳食蛋白质和能量摄入控制的反应。

DOI:
10.1152/ajpendo.1986.250.1.e39
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发表时间:
1986
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:
Yang,RD;Matthews,DE;Bier,DM;Wen,ZM;Young,VR

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Healthy young adult men were studied with 3 different series of dietary regimens: different levels of protein intake ranging from 1.5 to 0.0 g . kg-1 . day-1; different levels of dietary energy intake; and an excessive intake of protein (3.9 g . kg-1 . day-1). Under each dietary condition, subjects were infused postabsorptively with L-[1-13C]leucine, L-[15N]alanine, and L-[3,3,3-2H3]alanine to measure leucine and alanine kinetics. Leucine flux was significantly reduced when protein intake was restricted (maximum reduction = 24%), but changed insignificantly with dietary energy change or excessive protein intake. Alanine flux and de novo synthesis increased significantly when protein intake was restricted (maximum increase = 50%), changed proportionally with changes in dietary energy, and was significantly reduced with high protein intake. Stepwise regression showed that dietary carbohydrate intake, not protein intake, was the primary factor affecting alanine de novo synthesis. In addition, the alanine 2H tracer produced a 2.5-fold greater measure of alanine de novo synthesis than did the alanine 15N tracer.
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