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Postprandial body protein synthesis and amino acid catabolism measured with leucine and phenylalanine-tyrosine tracers.
Am J Physiol Endocrinol Metab. 2003 May; 284(5):E1037-42.AJ

Abstract

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 wt, 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. kg(-1). min(-1)) 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 < or = 0.01 vs. basal). With the use of intracellular precursor pools, the increase of protein synthesis with Phe-Tyr (+0.51 +/-0.21 mg. kg(-1). min(-1)) and Leu tracers (+0.57 +/- 0.14) were similar (P = not significant). In contrast, with plasma pools the increase of protein synthesis was more than twofold greater with Phe-Tyr (+1.17 +/- 0.19 mg. kg(-1). min(-1)) than that with Leu (0.50 +/- 0.13 mg. kg(-1). min(-1), P < 0.01). Direct correlations were found between Leu and Ox [using both plasma and intracellular pools (r < or = 0.65, P < or = 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.

Authors+Show Affiliations

Department of Clinical and Experimental Medicine, University of Padua, via Giustiniani 2, 35128 Padua, Italy. paolo.tessari@unipd.itNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

12676651

Citation

Tessari, Paolo, et al. "Postprandial Body Protein Synthesis and Amino Acid Catabolism Measured With Leucine and Phenylalanine-tyrosine Tracers." American Journal of Physiology. Endocrinology and Metabolism, vol. 284, no. 5, 2003, pp. E1037-42.
Tessari P, Kiwanuka E, Zanetti M, et al. Postprandial body protein synthesis and amino acid catabolism measured with leucine and phenylalanine-tyrosine tracers. Am J Physiol Endocrinol Metab. 2003;284(5):E1037-42.
Tessari, P., Kiwanuka, E., Zanetti, M., & Barazzoni, R. (2003). Postprandial body protein synthesis and amino acid catabolism measured with leucine and phenylalanine-tyrosine tracers. American Journal of Physiology. Endocrinology and Metabolism, 284(5), E1037-42.
Tessari P, et al. Postprandial Body Protein Synthesis and Amino Acid Catabolism Measured With Leucine and Phenylalanine-tyrosine Tracers. Am J Physiol Endocrinol Metab. 2003;284(5):E1037-42. PubMed PMID: 12676651.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Postprandial body protein synthesis and amino acid catabolism measured with leucine and phenylalanine-tyrosine tracers. AU - Tessari,Paolo, AU - Kiwanuka,Edward, AU - Zanetti,Michela, AU - Barazzoni,Rocco, PY - 2003/4/5/pubmed PY - 2003/5/22/medline PY - 2003/4/5/entrez SP - E1037 EP - 42 JF - American journal of physiology. Endocrinology and metabolism JO - Am J Physiol Endocrinol Metab VL - 284 IS - 5 N2 - 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 wt, 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. kg(-1). min(-1)) 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 < or = 0.01 vs. basal). With the use of intracellular precursor pools, the increase of protein synthesis with Phe-Tyr (+0.51 +/-0.21 mg. kg(-1). min(-1)) and Leu tracers (+0.57 +/- 0.14) were similar (P = not significant). In contrast, with plasma pools the increase of protein synthesis was more than twofold greater with Phe-Tyr (+1.17 +/- 0.19 mg. kg(-1). min(-1)) than that with Leu (0.50 +/- 0.13 mg. kg(-1). min(-1), P < 0.01). Direct correlations were found between Leu and Ox [using both plasma and intracellular pools (r < or = 0.65, P < or = 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. SN - 0193-1849 UR - https://www.unboundmedicine.com/medline/citation/12676651/Postprandial_body_protein_synthesis_and_amino_acid_catabolism_measured_with_leucine_and_phenylalanine_tyrosine_tracers_ L2 - https://journals.physiology.org/doi/10.1152/ajpendo.00416.2002?url_ver=Z39.88-2003&amp;rfr_id=ori:rid:crossref.org&amp;rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -