Higher circulating bile acid concentrations in obese patients with type 2 diabetes

Ann Clin Biochem. 2013 Jul;50(Pt 4):360-4. doi: 10.1177/0004563212473450. Epub 2013 Jun 14.

Abstract

Background: Bile acids (BAs) play an important role in releasing incretin hormones via the enteroendocrine L-cell surface TGR5 receptors. The aim of this study was to investigate the difference in BA concentration at baseline and in response to a meal stimulus between type 2 diabetes mellitus (T2DM) and a matched normoglycaemic group.

Materials and methods: A cross-sectional study of 12 patients with known T2DM and 12 matched normoglycaemic controls compared BA fractions after an overnight fast and following a standard meal.

Results: The T2DM group had higher baseline glucose (P < 0.001), but baseline total BA, total glycine conjugated BAs (GCBA) and total taurine conjugated BA (TCBA) were similar between both groups. The T2DM group compared to the normoglycaemic group had a higher post-prandial peak change in total BAs 4.28 (3.51-5.38) µmol/L vs. 0.88 (0.60-1.57) µmol/L (P < 0.001) and peak total GCBA 2.77 (1.07-4.19) µmol/L vs. 0.94 (0.34-1.15) µmol/L (P < 0.0001), but similar peak total TCBA 0.36 (0.02-0.76) µmol/L vs. 0.08 (0.04-0.22) µmol/L (P=0.91).

Conclusion: The post-prandial bile acid response is elevated in obese patients with T2DM compared to matched normoglycaemic individuals.

Keywords: Bile acids; TGR5 receptor; glucagon like peptide-1; type 2 diabetes mellitus.

MeSH terms

  • Adult
  • Bile Acids and Salts / blood*
  • Biomarkers / blood
  • Blood Glucose / metabolism*
  • Cross-Sectional Studies
  • Diabetes Mellitus, Type 2 / blood*
  • Diabetes Mellitus, Type 2 / diagnosis
  • Diabetes Mellitus, Type 2 / epidemiology
  • Fasting / blood
  • Female
  • Humans
  • Male
  • Middle Aged
  • Obesity / blood*
  • Obesity / diagnosis
  • Obesity / epidemiology
  • Postprandial Period / physiology*
  • Up-Regulation / physiology

Substances

  • Bile Acids and Salts
  • Biomarkers
  • Blood Glucose