alexa Transport of bile acids in a human intestinal epithelial cell line, Caco-2.
Pharmaceutical Sciences

Pharmaceutical Sciences

Journal of Bioequivalence & Bioavailability

Author(s): Hidalgo IJ, Borchardt RT

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Abstract The transport of taurocholic acid (TA) across Caco-2 cell monolayers was dependent on time in culture and reached a plateau after 28 days, at which time the apical (AP)-to-basolateral (BL) transport was 10-times greater than BL-to-AP transport. The amounts of TA inside the cells following application of 10 nM [14C]TA to the AP or BL side of the monolayers (30 min) were approximately equal (54.4 +/- 2.7 and 64.6 +/- 2.8 fmol/mg protein, respectively). AP-to-BL transport of TA was saturable and temperature-dependent. Vmax and Km for transport were 13.7 pmol/mg protein per min and 49.7 microM, respectively. The transport of TA had an activation energy of 13.2 kcal.mol-1, required Na+ and glucose. AP-to-BL transport of [14C]TA was inhibited by the co-administration (on the AP side) of either unlabeled TA or deoxycholate, but it was not reduced by the presence of unlabeled TA on the BL side.
This article was published in Biochim Biophys Acta and referenced in Journal of Bioequivalence & Bioavailability

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