Transepithelial flux of early and advanced glycation compounds across Caco-2 cell monolayers and their interaction with intestinal amino acid and peptide transport systems

The British Journal of Nutrition
Simone GrunwaldMatthias Brandsch


Maillard products arise from condensation reactions between amino acids or proteins with reducing sugars during food processing. As ubiquitous components of human food, these early or advanced glycation products may be subject to intestinal absorption. The present study was performed to investigate the intestinal uptake of Maillard products and to determine whether they are substrates for peptide and amino acid transporters expressed at the apical membrane of Caco-2 cells. At a concentration of 10 mM, N(epsilon)-(carboxymethyl)-L-lysine, N(alpha)-hippuryl-N(epsilon)-(1-deoxy-D-fructosyl)-L-lysine, N(alpha)-hippuryl-N(epsilon)-(carboxymethyl)-L-lysine and N(epsilon)-(1-deoxy-D-fructosyl)-L-lysine inhibited the [(14)C]glycylsarcosine uptake mediated by the H(+)-peptide co-transporter PEPT1 by 13 to 45%. For N(epsilon)-(1-deoxy-D-fructosyl)-L-lysine, an inhibitory constant of 8.7 mM was determined, reflecting a low affinity to PEPT1 in comparison with natural dipeptides. Uptake of L-[(3)H]lysine was weakly affected by N(epsilon)-(carboxymethyl)-L-lysine, N(alpha)-hippuryl-L-lysine and N(alpha)-hippuryl-N(epsilon)-(carboxymethyl)-L-lysine but strongly inhibited by N(epsilon)-(1-deoxy-D-fructosyl)-L-lysine (81%). None of the Maillar...Continue Reading


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