Abstract
Small peptides and some pharmacologically active compounds are absorbed from the small intestine by the apical H+-coupled peptide transporter 1 (PEPT1) and the basolateral peptide transporter. Here we investigated the efflux properties of the basolateral peptide transporter in Caco-2 cells using two strategies, efflux measurements and a kinetic analysis of transepithelial transport of glycylsarcosine (Gly-Sar). [14C]Gly-Sar efflux through the basolateral membrane was not affected significantly by the external pH. Both approaches revealed that the basolateral peptide transporter was saturable in the efflux direction, and that the affinity was lower than that in the influx direction. For two peptide-like drugs, there was no difference in substrate recognition by the basolateral peptide transporter between the two sides of the membrane. Using the kinetic parameters of PEPT1 and the basolateral peptide transporter, a computational model of Gly-Sar transport in Caco-2 cells was constructed. The simulation fitted the experimental data well. Our findings suggested that substrate affinity of the basolateral peptide transporter is apparently asymmetric, but pH-dependence and substrate specificity are symmetric for the two directions of transport. The behaviour of Gly-Sar in Caco-2 cells could be predicted by a mathematical model describing the peptide transporters.
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Acknowledgements
We thank Drs. S. Matsuoka and A. Noma, Department of Physiology and Biophysics, Kyoto University Graduate School of Medicine, for helpful discussion about the construction of simulation program. This work was supported in part by the Leading Project for Biosimulation, and a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan. Megumi Irie is a Research Fellow of the Japan Society for the Promotion of Science.
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Irie, M., Terada, T., Okuda, M. et al. Efflux properties of basolateral peptide transporter in human intestinal cell line Caco-2. Pflugers Arch - Eur J Physiol 449, 186–194 (2004). https://doi.org/10.1007/s00424-004-1326-x
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DOI: https://doi.org/10.1007/s00424-004-1326-x