Abstract | BACKGROUND/AIMS: METHODS: Hepatic protein and mRNA expression of various Oatps (1, 2, 4) in comparison to Ntcp were analyzed after 0.5, 1, 3 and 5 days of ethinylestradiol (EE) treatment (5 mg/kg) in rats. Binding activities of Oatp2 and Ntcp transactivators were assessed by electrophoretic mobility shift assays. RESULTS: CONCLUSIONS:
Estrogen-induced cholestasis results in a down-regulation of all basolateral organic anion transporters. The moderate decline in expression of Oatp1, -2 and -4 may explain the unchanged sodium-independent transport of bile acids due to overlapping substrate specificity. Reduction in transporter gene expression seems to be mediated by a diminished nuclear binding activity of transactivators such as HNF1, C/EBP and PXR by estrogens.
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Authors | Andreas Geier, Christoph G Dietrich, Thomas Gerloff, Jenny Haendly, Gerd A Kullak-Ublick, Bruno Stieger, Peter J Meier, Siegfried Matern, Carsten Gartung |
Journal | Biochimica et biophysica acta
(Biochim Biophys Acta)
Vol. 1609
Issue 1
Pg. 87-94
(Jan 10 2003)
ISSN: 0006-3002 [Print] Netherlands |
PMID | 12507762
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- DNA Primers
- Organic Anion Transporters
- RNA, Messenger
- Transcription Factors
- Ethinyl Estradiol
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Topics |
- Animals
- Base Sequence
- Basement Membrane
(drug effects, metabolism)
- Blotting, Northern
- Blotting, Western
- Cholestasis
(chemically induced, genetics, metabolism)
- DNA Primers
- Ethinyl Estradiol
(adverse effects)
- Male
- Organic Anion Transporters
(genetics, metabolism)
- Protein Binding
- RNA, Messenger
(genetics, metabolism)
- Rats
- Rats, Sprague-Dawley
- Transcription Factors
(metabolism)
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