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Common characteristics for Na+-dependent sugar transport in Caco-2 cells and human fetal colon

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Summary

The recent demonstration that the human colon adenocarcinoma cell line Caco-2 was susceptible to spontaneous enterocytic differentiation led us to consider the question as to whether Caco-2 cells would exhibit sodium-coupled transport of sugars. This problem was investigated using isotopic tracer flux measurements of the nonmetabolizable sugar analog α-methylglucoside (AMG). AMG accumulation in confluent monolayers was inhibited to the same extent by sodium replacement, 200 μm phlorizin, 1mm phloretin, and 25mm d-glucose, but was not inhibited further in the presence of both phlorizin and phloretin. Kinetic studies were compatible with the presence of both a simple diffusive process and a single, Na+-dependent, phlorizin-and phloretin-sensitive AMG transport system. These results also ruled out any interaction between AMG and a Na+-independent, phloretin-sensitive, facilitated diffusion pathway. The brush-border membrane localization of the Na+-dependent system was inferred from the observations that its functional differentiation was synchronous with the development of brush-border membrane enzyme activities and that phlorizin and phloretin addition 1 hr after initiating sugar transport produced immediate inhibition of AMG uptake as compared to ouabain. Finally, it was shown that brush-border membrane vesicles isolated from the human fetal colonic mucosa do possess a Na+-dependent transport pathway(s) ford-glucose which was inhibited by AMG and both phlorizin and phloretin. Caco-2 cells thus appear as a valuable cell culture model to study the mechanisms involved in the differentiation and regulation of intestinal transport functions.

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Blais, A., Bissonnette, P. & Berteloot, A. Common characteristics for Na+-dependent sugar transport in Caco-2 cells and human fetal colon. J. Membrain Biol. 99, 113–125 (1987). https://doi.org/10.1007/BF01871231

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