Splanchnic and whole-body leucine kinetics in young and elderly men.

Splanchnic and whole-body leucine kinetics in young and elderly men.
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年轻和老年男性的内脏和全身亮氨酸动力学。

DOI:
10.1093/ajcn/65.2.489
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发表时间:
1997
期刊:
The American journal of clinical nutrition
影响因子:
--
通讯作者:
B. Beaufrère
B. Beaufrère
中科院分区:
--
文献类型:
--
作者:
Yves Boirie;P. Gachon;B. Beaufrère

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全身和内脏蛋白质代谢测定前和期间的标准餐(41.8千焦/公斤),含15.6%的蛋白质,通过使用静脉注射([13 C]亮氨酸)和口服([2 H3]亮氨酸)示踪剂的组合,在6名年轻(平均年龄:22.7岁)和6名老年人(68.2岁)男子。在吸收后状态下,当校正瘦体重时,两组的亮氨酸通量和氧化相似(平均值+/- SEM:年轻和老年男性分别为1.80 +/- 0.09和1.79 +/- 0.07 mumol.kg-1.min-1,0.55 +/- 0.02和0.49 +/- 0.04 mumol.kg-1.min-1,NS)。年轻人和老年人对膳食的反应模式也相似:增加通量和氧化,减少蛋白质分解,蛋白质合成不变。老年男性的内脏亮氨酸提取率是老年男性的两倍(50 +/- 11%比23 +/-2%,P < 0.05),与血浆亮氨酸浓度呈负相关(r =-0.771,P < 0.01),与体重指数呈正相关(r = 0.861,P < 0.001)。总之,在老年男性中,在进食期间肠道、肝脏或两者的亮氨酸提取较高,这可能导致膳食亮氨酸的外周可用性较低。
Whole-body and splanchnic protein metabolism were determined in six young (mean age: 22.7 y) and six old (68.2 y) men before and during a standardized meal (41.8 kJ/kg) containing 15.6% protein, by using a combination of intravenous ([13C]leucine) and oral ([2H3]leucine) tracers. In the postabsorptive state, leucine flux and oxidation were similar in both groups when corrected for lean body mass (mean +/- SEM: 1.80 +/- 0.09 compared with 1.79 +/- 0.07 mumol.kg-1.min-1 and 0.55 +/- 0.02 compared with 0.49 +/- 0.04 mumol.kg-1.min-1 for young and old men, respectively, NS). The pattern of response to the meal was also similar in young and old men: increased flux and oxidation, decreased protein breakdown, and unchanged protein synthesis. Splanchnic extraction of dietary leucine was twice as high in elderly men (50 +/- 11% compared with 23 +/- 2%, P < 0.05), was inversely related to plasma leucine concentration (r = -0.771, P < 0.01), and was positively related to body mass index (r = 0.861, P < 0.001). In conclusion, in elderly men there is higher leucine extraction by the gut, liver, or both during feeding, which could lead to a lower peripheral availability of dietary leucine.
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。
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