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• W1972404459 abstract "Hydrolysis and absorption of glycylglycine and glycyl-L-leucine as well as absorption of glycine and leucine were studied in chronic experiments on rats with their isolated small intestine loop. Values of the “true” kinetic constants (with taking into account effect of the preepithelial layer) were determined to be as follows: (1) K t = 46.7 ± 4.0 and 2.15 ± 0.59 mM, J max = 0.74 ± 0.15 and 0.16 ± 0.03 μmol min−1 cm−1 (for transport of free glycine and leucine, respectively); (2) K t = 4.4 ± 0.6 and 4.8 ± 0.9 mM, J max = 0.24 ± 0.02 and 0.23 ± 0.02 μmol min−1 cm−1 (for transport of glycylglycine and glycyl-L-leucine, respectively); (3) K M = 5.4 ± 1.0 and 38.2 ± 4.4 mM, V max = 0.09 ± 0.02 and 0.24 ± 0.07 μmol min−1 cm−1 (for membrane hydrolysis of these dipeptides, respectively). According to our calculations, in the wide range of the initial glycylglycine concentrations (2.5–40 mM) a part of the peptide component in its total absorption accounts for 0.77–0.80. In the case of glycyl-L-leucine a part of the peptide component in the total glycine absorption decreases from 0.89 to 0.84, while in the total leucine absorption—from 0.86 to 0.71, the initial dipeptide concentration rising from 5 to 40 mM. The obtained results show that the peptide component prevails in absorption of the studied dipeptides in the rat small intestine, but its role is much lesser than what many authors believe. In the case of glycyl-L-leucine, the peptide component can achieve saturation in the range of high substrate concentrations, its part decreasing essentially to become compared with absorption of free amino acids formed as a result of the dipeptide membrane hydrolysis." @default.
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• W1972404459 date "2009-04-01" @default.
• W1972404459 modified "2023-10-18" @default.
• W1972404459 title "Evaluation of role of the peptide transport system in absorption of dipeptides in the rat small intestine in chronic experiments in vivo" @default.
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• W1972404459 doi "https://doi.org/10.1134/s0022093009020042" @default.
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