Acute Macrovascular Dysfunction in Patients With Type 2 Diabetes Induced by Ingestion of Advanced Glycated β-lactoglobulins

Diabetes Care. 2013 May;36(5):1278-82. doi: 10.2337/dc12-1489. Epub 2012 Dec 13.

Abstract

Objective: Recent evidence indicates that heat-enhanced food advanced glycation end products (AGEs) adversely affect vascular function. The aim of this study was to examine the acute effects of an oral load of heat-treated, AGE-modified β-lactoglobulins (AGE-BLG) compared with heat-treated, nonglycated BLG (C-BLG) on vascular function in patients with type 2 diabetes mellitus (T2DM).

Research design and methods: In a double-blind, controlled, randomized, crossover study, 19 patients with T2DM received, on two different occasions, beverages containing either AGE-BLG or C-BLG. We measured macrovascular [brachial ultrasound of flow-mediated dilatation (FMD)] and microvascular (laser-Doppler measurements of reactive hyperemia in the hand) functions at baseline (T0), 90 (T90), and 180 (T180) min.

Results: Following the AGE-BLG, FMD decreased at T90 by 80% from baseline and remained decreased by 42% at T180 (P < 0.05 vs. baseline, P < 0.05 vs. C-BLG at T90). By comparison, following C-BLG, FMD decreased by 27% at T90 and 51% at T180 (P < 0.05 vs. baseline at T180). A significant decrease in nitrite (T180) and nitrate (T90 and T180), as well as a significant increase in N(ε)-carboxymethyllisine, accompanied intake of AGE-BLG. There was no change in microvascular function caused by either beverage.

Conclusions: In patients with T2DM, acute oral administration of a single AGE-modified protein class significantly though transiently impaired macrovascular function in concert with decreased nitric oxide bioavailability. These AGE-related changes were independent of heat treatment.

Trial registration: ClinicalTrials.gov NCT01456026.

Publication types

  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Cross-Over Studies
  • Diabetes Mellitus, Type 2 / metabolism*
  • Diabetes Mellitus, Type 2 / physiopathology*
  • Female
  • Glycation End Products, Advanced / adverse effects*
  • Humans
  • Lactoglobulins / adverse effects*
  • Male
  • Microcirculation / drug effects
  • Middle Aged

Substances

  • Glycation End Products, Advanced
  • Lactoglobulins

Associated data

  • ClinicalTrials.gov/NCT01456026