Postprandial body protein synthesis and amino acid catabolism measured with leucine and phenylalanine-tyrosine tracers

Paolo Tessari, Edward Kiwanuka, Michela Zanetti, Rocco Barazzoni
2003 American Journal of Physiology. Endocrinology and Metabolism  
Postprandial body protein synthesis and amino acid catabolism measured with leucine and phenylalanine-tyrosine tracers. Am J Physiol Endocrinol Metab Whether phenylalanine-tyrosine (Phe-Tyr) tracers yield estimates of postprandial protein synthesis comparable to those of the widely used leucine (Leu) tracer is unclear. We measured Leu oxidation (Ox), Phe hydroxylation (Hy), and their disposal into whole body protein synthesis before and after the administration of a mixed meal (62 kJ/kg body
more » ... 22% of energy as protein), over 4 h in healthy subjects. Both plasma and intracellular precursor pools were used. The amino acid data were extrapolated to body protein by assuming a fixed ratio of Leu to Phe in the proteins. In the postabsorptive state, whole body protein synthesis (expressed as mg ⅐ kg Ϫ1 ⅐ min Ϫ1 ) was similar between Leu and Phe-Tyr tracers irrespective of the precursor pool used. After the meal, Leu Ox, Phe Hy, and body protein synthesis increased (P Յ 0.01 vs. basal). With the use of intracellular precursor pools, the increase of protein synthesis with Phe-Tyr (ϩ0.51 Ϯ0.21 mg ⅐ kg Ϫ1 ⅐ min Ϫ1 ) and Leu tracers (ϩ0.57 Ϯ 0.14) were similar (P ϭ not significant). In contrast, with plasma pools the increase of protein synthesis was more than twofold greater with Phe-Tyr (ϩ1.17 Ϯ 0.19 mg ⅐ kg Ϫ1 ⅐ min Ϫ1 ) than that with Leu (0.50 Ϯ 0.13 mg ⅐ kg Ϫ1 ⅐ min Ϫ1 , P Ͻ 0.01). Direct correlations were found between Leu and Ox [using both plasma and intracellular pools (r Յ 0.65, P Յ 0.01)] but not between Phe and either plasma or intracellular Hy. In conclusion, 1) Phe-Tyr and Leu tracers yield comparable estimates of body protein synthesis postprandially, provided that intracellular precursor pools are used; 2) both Leu Ox and Phe Hy are stimulated by a mixed meal; 3) Phe does not correlate with Hy, which might be better related to the (unknown) portal Phe.
doi:10.1152/ajpendo.00416.2002 pmid:12676651 fatcat:gkpsgb3a6rhsro7ulyjbf2uxo4