Journal
JOURNAL OF BIOCHEMICAL AND MOLECULAR TOXICOLOGY
Volume 23, Issue 5, Pages 364-372Publisher
WILEY
DOI: 10.1002/jbt.20301
Keywords
Advanced Glycation End Products; Receptor for Advanced Glycation End Products; Nuclear Factor-kappa B; Tumor Necrosis Factor Alpha; Reactive Oxygen Species
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Funding
- Department of Agriculture and Rural Development (DARD)
- Northern Ireland
- Queen's University Belfast
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The extent of absorption of dietary advanced glycation end products (AGEs) is not fully known. The possible physiological impact of these absorbed components on inflammatory processes has been studied little and was the aim of this investigation. Aqueous solutions of bovine casein and glucose were heated at 95 degrees C for 5 h to give AGE-casein (AGE-Cas). Simulated stomach and small intestine digestion of AGE-Cas and dialysis (molecular mass cutoff of membrane = 1 kDa) resulted in a low molecular mass (LMM) fraction of digestion products, which was used to prepare bovine serum albumin (BSA)-LMM-AGE-Cas complexes. Stimulation of human microvascular endothelial cells with BSA-LMM-AGE-Cas complexes significantly increased mRNA expression of the receptor of AGE (RAGE), galectin-3 (AGE-113), tumor necrosis factor alpha, and a marker of the mitogen-activated protein kinase pathway (MAPK-1), as well as p65NF-kappa B activation. Cells treated with LMM digestion products of AGE-Cas significantly increased AGE-R3 mRNA expression. Intracellular reactive oxygen species production increased significantly in cells challenged with BSA-LMM-AGE-Cas and LMM-AGE-Cas. In conclusion, in an in vitro cell system, digested dietary AGEs complexed with serum albumin play a role in the regulation of RAGE and down-stream inflammatory pathways. AGE-R3 may protect against these effects. (C) 2009 Wiley Periodicals, Inc. J Biochem Mol Toxicol 23:364-372, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10:1002/jbt.20301
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