Differential metabolic impact of gastric bypass surgery versus dietary intervention in obese diabetic subjects despite identical weight loss.

Journal Article

Glycemic control is improved more after gastric bypass surgery (GBP) than after equivalent diet-induced weight loss in patients with morbid obesity and type 2 diabetes mellitus. We applied metabolomic profiling to understand the mechanisms of this better metabolic response after GBP. Circulating amino acids (AAs) and acylcarnitines (ACs) were measured in plasma from fasted subjects by targeted tandem mass spectrometry before and after a matched 10-kilogram weight loss induced by GBP or diet. Total AAs and branched-chain AAs (BCAAs) decreased after GBP, but not after dietary intervention. Metabolites derived from BCAA oxidation also decreased only after GBP. Principal components (PC) analysis identified two major PCs, one composed almost exclusively of ACs (PC1) and another with BCAAs and their metabolites as major contributors (PC2). PC1 and PC2 were inversely correlated with pro-insulin concentrations, the C-peptide response to oral glucose, and the insulin sensitivity index after weight loss, whereas PC2 was uniquely correlated with levels of insulin resistance (HOMA-IR). These data suggest that the enhanced decrease in circulating AAs after GBP occurs by mechanisms other than weight loss and may contribute to the better improvement in glucose homeostasis observed with the surgical intervention.

Full Text

Duke Authors

Cited Authors

  • Laferrère, B; Reilly, D; Arias, S; Swerdlow, N; Gorroochurn, P; Bawa, B; Bose, M; Teixeira, J; Stevens, RD; Wenner, BR; Bain, JR; Muehlbauer, MJ; Haqq, A; Lien, L; Shah, SH; Svetkey, LP; Newgard, CB

Published Date

  • April 27, 2011

Published In

Volume / Issue

  • 3 / 80

Start / End Page

  • 80re2 -

PubMed ID

  • 21525399

Electronic International Standard Serial Number (EISSN)

  • 1946-6242

Digital Object Identifier (DOI)

  • 10.1126/scitranslmed.3002043

Language

  • eng

Conference Location

  • United States