PMID: 3123697Jan 1, 1987

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

The Journal of Membrane Biology
A BlaisA Berteloot


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 alpha-methylglucoside (AMG). AMG accumulation in confluent monolayers was inhibited to the same extent by sodium replacement, 200 microM phlorizin, 1 mM phloretin, and 25 mM 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...Continue Reading


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methylglucoside, 6-(17)O-labeled, (alpha-L)-isomer
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