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Am J Physiol Endocrinol Metab 277: E513-E520, 1999;
0193-1849/99 $5.00
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Vol. 277, Issue 3, E513-E520, September 1999

EPILOGUE
Oral amino acids stimulate muscle protein anabolism in the elderly despite higher first-pass splanchnic extraction

Elena Volpi1,4, Bettina Mittendorfer2, Steven E. Wolf2,4, and Robert R. Wolfe2,3,4

Departments of 1 Internal Medicine, 2 Surgery, and 3 Anesthesiology, The University of Texas Medical Branch, and 4 Shriners Burns Hospital, Galveston, Texas 77550

Muscle protein synthesis and breakdown and amino acid transport were measured in 7 healthy young (30 ± 2 yr) and 8 healthy elderly (71 ± 2 yr) volunteers in the postabsorptive state and during the oral administration of an amino acid mixture with L-[ring-2H5]phenylalanine infusion, femoral artery and vein catheterization, and muscle biopsies. Phenylalanine first-pass splanchnic extraction was measured by adding L-[ring-13C6]phenylalanine to the mixture. In the postabsorptive state, no differences in muscle amino acid kinetics were detected between young and elderly volunteers. Phenylalanine first-pass splanchnic extraction was significantly higher in the elderly (P < 0.003) during ingestion of amino acids, but the delivery to the leg increased to the same extent in both groups. Phenylalanine transport into the muscle, muscle protein synthesis, and net balance increased significantly (P < 0.01) and similarly in both the young and the elderly. We conclude that, despite an increased splanchnic first-pass extraction, muscle protein anabolism can be stimulated by oral amino acids in the elderly as well as in the young.

aging; amino acid metabolism; amino acid transport; protein synthesis; stable isotopes


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