Abstract
Sinusoidal and apical transporters are responsible for the uptake and biliary elimination of many compounds by hepatocytes. Few in vitro models are however available for analyzing such functions. The expression and bile-acid inducibility of 13 transporters and two nuclear receptors were investigated in the new rat polarized lines, Can 3−1 and Can 10, and in their unpolarized parent, Fao. The relative abundance of mRNA, the protein level, and their localization were examined by real-time quantitative PCR, Western blotting, immunofluorescence, and confocal microscopy. Compared with rat liver, mRNA levels of Fao cells were: negligible for Bsep/Abcb11; lower for the uptake transporters Ntcp and Oatps; similar for SHP, FXR, and Bcrp/Abcg2; and higher (four–fold to 160-fold) for the efflux pumps Mdr1b/Abcb1b, Mdr2/Abcb4, Mrp1/Abcc1, Mrp2/Abcc2, Mrp3/Abcc3, Abcg5, and Abcg8. This profile was mostly maintained (and improved for Bsep) in Can 10. Some transporters were less well expressed in Can 3−1. In both lines, sinusoidal (Ntcp, Mrp3) and canalicular transporters (Mdr-P-glycoproteins detected with C219 antibody, Mrp2) were localized at their correct poles. Bile-acid effects on polarity and mRNA levels of transporters were analyzed after a 6-day treatment with 50 μM taurocholic, chenodeoxycholic (CDCA), or ursodeoxycholic acid (UDCA). No polarization of Fao cells was induced; Can 10 and Can 3−1 polarity was maintained. CDCA and UDCA induced marked enhancement of the volume of Can 10 bile canaliculi. CDCA upregulated Bsep, Mdr2, SHP, Mdr1b, and Oatp2/1a4 in Can 10 (two- to seven-fold) and in Fao cells. Thus, Can 10 constitutes an attractive polarized model for studying vectorial hepatobiliary transport of endogenous and xenobiotic cholephilic compounds.
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Abbreviations
- Abc/ABC:
-
ATP-binding cassette
- BC:
-
bile canaliculi
- Bcrp:
-
breast cancer resistance protein
- Bsep/BSEP:
-
bile salt export pump
- CDCA:
-
chenodeoxycholic acid
- DPPIV:
-
dipeptidylpeptidase IV
- FITC:
-
fluorescein isothiocyanate
- FXR:
-
farnesoid X-activated receptor
- Mdr/MDR:
-
multidrug resistance protein
- Mrp/MRP:
-
multidrug resistance-associated protein
- Ntcp:
-
Na+-taurocholate co-transporting polypeptide
- PBS:
-
phosphate-buffered saline
- Oatp/OATP:
-
organic anion transporting polypeptide
- PM:
-
plasma membrane
- SHP:
-
small heterodimer partner
- TCA:
-
taurocholic acid
- UDCA:
-
ursodeoxycholic acid
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Acknowledgments
We are grateful to A. Hubbard, D. Keppler, B.R. Stevenson, and B. Stieger for kindly providing antibodies. We also thank V. Nicolas (IFR141-ITFM, Chatenay Malabry, France) and Mickael Bourge (INSERM U757, Orsay, France) for help with confocal analysis and artwork, respectively.
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This work was supported by a grant from Egide (PAI Picasso) and the Acción Integrada Hispano-Francesa (HF2003-0089). This research group is part of the Network for Cooperative Research on Membrane Transport Proteins (REIT), co-funded by the Ministerio de Educación y Ciencia, Spain and the European Regional Development Fund (ERDF; grant BFU2005-24983-E/BFI) and belongs to the “Centro de Investigación Biomédica en Red” for Hepatology and Gastroenterology Research (CIBERehd), Instituto de Salud Carlos III, Spain.
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Cassio, D., Macias, R.I.R., Grosse, B. et al. Expression, localization, and inducibility by bile acids of hepatobiliary transporters in the new polarized rat hepatic cell lines, Can 3−1 and Can 10. Cell Tissue Res 330, 447–460 (2007). https://doi.org/10.1007/s00441-007-0494-3
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DOI: https://doi.org/10.1007/s00441-007-0494-3