Cited by 286Muscle metabolism and nutritionAdrenal Hormones and DisordersMuscle Physiology and Disorders

Increased proteolysis. An effect of increases in plasma cortisol within the physiologic range.

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Simmons, P S, Miles, J M, Gerich, J E, Haymond, M W·1984·Journal of Clinical Investigation

Abstract

Prolonged exposure to glucocorticoids in pharmacologic amounts results in muscle wasting, but whether changes in plasma cortisol within the physiologic range affect amino acid and protein metabolism in man has not been determined. To determine whether a physiologic increase in plasma cortisol increases proteolysis and the de novo synthesis of alanine, seven normal subjects were studied on two occasions during an 8-h infusion of either hydrocortisone sodium succinate (2 micrograms/kg X min) or saline. The rate of appearance (Ra) of leucine and alanine were estimated using [2H3]leucine and [2H3]alanine. In addition, the Ra of leucine nitrogen and the rate of transfer of leucine nitrogen to alanine were estimated using [15N]leucine. Plasma cortisol increased (10 +/- 1 to 42 +/- 4 micrograms/dl) during cortisol infusion and decreased (14 +/- 2 to 10 +/- 2 micrograms/dl) during saline infusion. No change was observed in plasma insulin, C-peptide, or glucagon during either saline or cortisol infusion. Plasma leucine concentration increased more (P less than 0.05) during cortisol infusion (120 +/- 1 to 203 +/- 21 microM) than saline (118 +/- 8 to 154 +/- 4 microM) as a result of a greater (P less than 0.01) increase in its Ra during cortisol infusion (1.47 +/- 0.08 to 1.81 +/- 0.08 mumol/kg X min for cortisol vs. 1.50 +/- 0.08 to 1.57 +/- 0.09 mumol/kg X min). Leucine nitrogen Ra increased (P less than 0.01) from 2.35 +/- 0.12 to 3.46 +/- 0.24 mumol/kg X min, but less so (P less than 0.05) during saline infusion (2.43 +/- 0.17 to 2.84 +/- 0.15 mumol/kg X min, P less than 0.01). Alanine Ra increased (P less than 0.05) during cortisol infusion but remained constant during saline infusion. During cortisol, but not during saline infusion, the rate and percentage of leucine nitrogen going to alanine increased (P less than 0.05). Thus, an increase in plasma cortisol within the physiologic range increases proteolysis and the de novo synthesis of alanine, a potential gluconeogenic substrate. Therefore, physiologic changes in plasma cortisol play a role in the regulation of whole body protein and amino acid metabolism in man.

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  1. Faloona, G., and R. Unger. 1974. Glucagon. In Methods of Hormone Radioimmunoassay. B. Jaffe and H. Behrman, editors. Ac- ademic Press, Inc., New York. 317-330.
  2. Nissen, S., K. Pratt, C. Van Huysen, and M. W. Haymond. 1983. Role of a-ketoisocaproate transport from muscle to liver in main- taining postabsorptive liver protein synthesis. Fed. Proc. 42(4):1310. (Abstr.)

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Authors
Simmons, P. S., Miles, J. M., Gerich, J. E., & Haymond, M. W.
Affiliations
Mayo Clinic (US)
Venue
Journal of Clinical Investigation
Published
1984-02-01
Volume
73
Issue
2
Pages
412-420
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2075956591
Cited by
286
References
41
Citations by year
2026: 3 · 2025: 5 · 2024: 4 · 2023: 4 · 2022: 6 · 2021: 13 · 2020: 15 · 2019: 6 · 2018: 6 · 2017: 14 · 2016: 2 · 2015: 6 · 2014: 10 · 2013: 11 · 2012: 3
FWCI
2.83
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Wasie Foundation
  • Mayo Foundation for Medical Education and Research
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
plasma cortisol, proteolysis, leucine kinetics, alanine synthesis, amino acid metabolism, protein metabolism, muscle atrophy, insulin, glucagon, C-peptide, nitrogen balance, muscle protein turnover, nitrogen retention, nitrogen excretion, nitrogen intake
MeSH terms
Adult, Alanine, Amino Acids, Blood Glucose, Humans, Hydrocortisone, Kinetics, Leucine, Nitrogen, Peptide Hydrolases

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