Metabolomic analysis reveals altered skeletal muscle amino acid and fatty acid handling in obese humans.


Journal Article

OBJECTIVE: Investigate the effects of obesity and high-fat diet (HFD) exposure on fatty acid oxidation and TCA cycle intermediates and amino acids in skeletal muscle to better characterize energy metabolism. METHODS: Plasma and skeletal muscle metabolomic profiles were measured from lean and obese males before and after a 5-day HFD in the 4 h postprandial condition. RESULTS: At both time points, plasma short-chain acylcarnitine species (SCAC) were higher in the obese subjects, while the amino acids glycine, histidine, methionine, and citrulline were lower in skeletal muscle of obese subjects. Skeletal muscle medium-chain acylcarnitines (MCAC) C6, C8, C10:2, C10:1, C10, and C12:1 increased in obese subjects, but decreased in lean subjects, from pre- to post-HFD. Plasma content of C10:1 was also decreased in the lean but increased in the obese subjects from pre- to post-HFD. CD36 increased from pre- to post-HFD in obese but not lean subjects. CONCLUSIONS: Lower skeletal muscle amino acid content and accumulation of plasma SCAC in obese subjects could reflect increased anaplerosis for TCA cycle intermediates, while accumulation of MCAC suggests limitations in β-oxidation. These measures may be important markers of or contributors to dysregulated metabolism observed in skeletal muscle of obese humans.

Full Text

Duke Authors

Cited Authors

  • Baker, PR; Boyle, KE; Koves, TR; Ilkayeva, OR; Muoio, DM; Houmard, JA; Friedman, JE

Published Date

  • May 2015

Published In

Volume / Issue

  • 23 / 5

Start / End Page

  • 981 - 988

PubMed ID

  • 25864501

Pubmed Central ID

  • 25864501

Electronic International Standard Serial Number (EISSN)

  • 1930-739X

Digital Object Identifier (DOI)

  • 10.1002/oby.21046


  • eng

Conference Location

  • United States