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Articles in PresS, published online ahead of print March 13, 2002
Am J Physiol Gastrointest Liver Physiol, 10.1152/ajpgi.00534.2001
Submitted on December 20, 2001
Accepted on February 4, 2002
1 Department of Biochemistry/Biotechology, University Halle, Halle, Germany; Department of Biocenter, University Halle, Halle, Germany
2 Department of Nutritional Sciences, University Munich, Munich, Germany
3 Department of Biocenter, University Halle, Halle, Germany
4 Department of Biochemistry/Biotechology, University Halle, Halle, Germany
* To whom correspondence should be addressed. E-mail: brandsch{at}biozentrum.uni-halle.de.
This study describes for the first time the presence of H+/peptide cotransport in cells of the bile duct. Uptake of [14C]Gly-Sar in human extrahepatic cholangiocarcinoma SK-ChA-1 cells was stimulated 7-fold by an inwardly directed H+ gradient. Transport was mediated by a lowaffinity system with a Kt value of 1.1 mM. Several dipeptides, cefadroxil and 
-aminolevulinic acid but not glycine and glutathione were strong inhibitors of Gly-Sar uptake. SK-ChA-1 cells formed tight and polarized monolayers on permeable membranes. The transepithelial electrical resistance was 856 ± 29 
.cm2. The transepithelial flux of [14C]Gly-Sar in apical-to-basolateral direction exceeded the basolateral-to-apical flux 11-fold. Uptake was 20-fold higher from the apical side. RT-PCR analysis using primer pairs specific for the intestinal-type (PEPT1) or kidney-type peptide transporter (PEPT2) revealed that the transport system expressed in SK-ChA-1 and also in cells of the native rabbit bile duct is PEPT1. Immunohistochemistry localized PEPT1 to apical membrane of cholangiocytes of mouse extrahepatic biliary duct. We conclude that the cells of the mammalian extrahepatic biliary tract epithelium express the intestinal-type H+/peptide cotransporter PEPT1 in their apical membrane. SK-ChA-1 cells represent a convenient model to study the physiological and clinical aspects of peptide transport in cholangiocytes.
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