Cited by 174Muscle metabolism and nutritionClinical Nutrition and GastroenterologyAnimal Nutrition and Physiology

Acute postprandial changes in leucine metabolism as assessed with an intrinsically labeled milk protein

Boirie, Y., Gachon, P., Corny, S., Fauquant, J., Maubois, J. L., Beaufrere, B.·1996·American Journal of Physiology-Endocrinology and Metabolism

Abstract

Mechanisms of protein gain during protein feeding have been investigated using a combination of oral and intravenous labeled leucine in healthy young men. The oral labeled leucine was administered as a free oral tracer ([13C]- or [2H3]leucine) added to unlabeled whey protein or as whey protein intrinsically labeled with L-[1-13C]leucine. When the oral tracer was free leucine, it appeared in the plasma more rapidly than the unlabeled leucine derived from the whey protein, and this resulted in an artifactual 88% decrease of protein breakdown. When the oral tracer was protein bound, protein breakdown did not change significantly after the meal. In contrast, nonoxidative leucine disposal (i.e., protein synthesis) was stimulated by 63% by the meal. In conclusion, 1) an intrinsically labeled protein is more appropriate than an oral free tracer to study postprandial leucine kinetics under non-steady-state conditions and 2) protein gain after a single whey protein meal results solely from an increased protein synthesis with no modification of protein breakdown.

Integrity signals

Registry

Crossref · 10.1152/ajpendo.1996.271.6.e1083

Cites

12 of 12 references verified0 citation errors · 0 not checkable

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  • Different types of proteins (e.g., casein, whey, and soy) are digested at different rates, which may affect whole body catabolism and anabolism and acute stimulation of muscle protein synthesis.

    “For example, different types of proteins (e.g., casein, whey, and soy) are digested at different rates, which may affect whole body catabolism and anabolism and acute stimulation of muscle protein synthesis (MPS) [91–96].”

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Authors
Boirie, Y., Gachon, P., Corny, S., Fauquant, J., Maubois, J. L., & Beaufrere, B.
Affiliations
  • Laboratoire de Nutrition Humaine, Universite Clermont Auvergne,Clermont-Ferrand, France.
  • Université Clermont Auvergne (FR)
Venue
American Journal of Physiology-Endocrinology and Metabolism
Published
1996-12-01
Volume
271
Issue
6
Pages
E1083-E1091
ISSN
  • 0193-1849 (ISSN-L)
  • 1522-1555
OpenAlex
W1945646895
Cited by
174
References
12
Citations by year
2026: 1 · 2025: 4 · 2024: 2 · 2023: 8 · 2022: 5 · 2021: 8 · 2020: 6 · 2019: 10 · 2018: 5 · 2017: 9 · 2016: 12 · 2015: 10 · 2014: 8 · 2013: 11 · 2012: 6
FWCI
1.58
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Endocrinology and Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Nursing › Nutrition and Dietetics › Clinical Nutrition and Gastroenterology
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Nutrition and Physiology
Keywords
leucine metabolism, protein degradation, whey protein, protein gain, leucine kinetics, non-steady state
MeSH terms
Administration, Oral, Adult, Carbon Radioisotopes, Humans, Injections, Intravenous, Leucine, Male, Milk Proteins, Tritium, Postprandial Period

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