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• W1057450 abstract "To estimate whole body and splanchnic metabolism of dietary amino acids, phenylalanine and leucine kinetics were determined simultaneously in six normal volunteers before and during the constant administration of a complete mixed meal, employing multiple tracers of these amino acids. L-[5,5,5-2H]leucine and L-[2,6-3H]-phenylalanine were infused intravenously; L-[1-13C]leucine and L-[1-14C]phenylalanine were administered orally with the meal. During the meal, steady-state leucine concentration rose from 136 +/- 6 to 190 +/- 14 mumol/l (P less than 0.01), phenylalanine from 44 +/- 4 to 61 +/- 6 mumol/l (P less than 0.01), total leucine rate of appearance (Ra) from 1.29 +/- 0.03 to 1.77 +/- 0.07 (P less than 0.01, +37 +/- 3%), and phenylalanine Ra from 0.73 +/- 0.05 to 0.80 +/- 0.07 mumol.kg-1.min-1 (P less than 0.05, +8 +/- 3%). Splanchnic uptake of dietary phenylalanine was greater (P less than 0.001) than that of leucine (58 +/- 4 vs. 25 +/- 4%, respectively), 44 +/- 3% of circulating leucine derived from the diet vs. 20 +/- 2% of circulating phenylalanine (P less than 0.01). Endogenous leucine and phenylalanine Ra were significantly suppressed (P less than 0.05). In summary: 1) splanchnic uptake of dietary phenylalanine is onefold greater than that of leucine; 2) dietary contribution to systemic phenylalanine Ra is about half of that to leucine Ra; and 3) endogenous appearance of both leucine and phenylalanine after the meal is suppressed. In conclusion, splanchnic metabolism of dietary leucine and phenylalanine differs markedly and can be quantitated in vivo without catheterization." @default.
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• W1057450 date "1992-04-01" @default.
• W1057450 modified "2023-10-15" @default.
• W1057450 title "Leucine and phenylalanine kinetics during mixed meal ingestion: a multiple tracer approach" @default.
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• W1057450 doi "https://doi.org/10.1152/ajpendo.1992.262.4.e455" @default.
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