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:
影响因子:
--
通讯作者:
B. Beaufrère
中科院分区:
文献类型:
--
作者:
Yves Boirie;P. Gachon;B. Beaufrère
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.
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DOI:
10.1152/ajpendo.1981.240.6.e712
发表时间:
1981
期刊:
The American journal of physiology
影响因子:
--
作者:
Motil,KJ;Matthews,DE;Bier,DM;Burke,JF;Munro,HN;Young,VR
通讯作者:
Young,VR
DOI:
10.1152/ajpendo.1993.265.2.e210
发表时间:
1993
期刊:
The American journal of physiology
影响因子:
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作者:
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通讯作者:
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DOI:
10.1152/ajpendo.1989.256.2.e288
发表时间:
1989-02
期刊:
The American journal of physiology
影响因子:
--
作者:
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通讯作者:
N. Fukagawa;K. Minaker;V. Young;D. Matthews;D. Bier;J. Rowe
DOI:
10.1152/ajpendo.1994.267.4.e599
发表时间:
1994
期刊:
The American journal of physiology
影响因子:
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作者:
Welle,S;Thornton,C;Statt,M;McHenry,B
通讯作者:
McHenry,B
DOI:
10.1152/ajpendo.1990.259.1.e36
发表时间:
1990
期刊:
The American journal of physiology
影响因子:
--
作者:
Yu,YM;Wagner,DA;Tredget,EE;Walaszewski,JA;Burke,JF;Young,VR
通讯作者:
Young,VR