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Am J Physiol Gastrointest Liver Physiol 263: G625-G631, 1992;
0193-1857/92 $5.00
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AJP - Gastrointestinal and Liver Physiology, Vol 263, Issue 5 625-G631, Copyright © 1992 by American Physiological Society

ARTICLES

Constitutive expression of the taurine transporter in a human colon carcinoma cell line

C. Tiruppathi, M. Brandsch, Y. Miyamoto, V. Ganapathy and F. H. Leibach
Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta 30912-2100.

The human colon carcinoma cell line HT-29, when grown to confluence, was found to take up taurine and accumulate it against a concentration gradient from a NaCl-containing uptake medium. Replacement of NaCl with choline chloride almost totally abolished the uptake. Taurine uptake was dependent not only on Na+ but also on Cl-, because other anions failed to support the uptake in the presence of Na+. The uptake process was specific for beta-amino acids such as taurine, hypotaurine, and beta-alanine. Apparently, a single transport system with a Michaelis-Menten constant of 10.6 +/- 0.3 microM was responsible for the uptake. Stoichiometric analyses revealed that the Na+:taurine coupling ratio was 2:1, whereas the Cl-:taurine coupling ratio was 1:1. Culture of the cells in the presence of taurine caused downregulation of the uptake system. These cells were also capable of accumulating beta-alanine against a concentration gradient in the presence of NaCl. Beta-Alanine uptake occurred via a single transport system with an apparent Michaelis-Menten constant of 36 +/- 2 microM. Taurine and beta-alanine exhibited mutual interaction during uptake. Kinetic experiments strongly suggested that a common transporter was responsible for the uptake of these two beta-amino acids. It is concluded that the HT-29 cells constitutively express the taurine transporter and that this cell line may be a suitable model for investigations of intestinal taurine transporter.


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P. R. Cammarata, G. Schafer, S.-W. Chen, Z. Guo, and R. E. Reeves
Osmoregulatory Alterations in Taurine Uptake by Cultured Human and Bovine Lens Epithelial Cells
Invest. Ophthalmol. Vis. Sci., February 1, 2002; 43(2): 425 - 433.
[Abstract] [Full Text] [PDF]


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