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Dissecting the relative contribution of OATP1B1-mediated uptake of xenobiotics into human hepatocytes using siRNA.
MedLine Citation:
PMID:  23461378     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Abstract 1. Organic anion transporting polypeptide 1B1 plays a pivotal role in the disposition of many anionic drugs. Significant overlap in substrate specificity between individual OATP isoforms has hampered the identification of the relative importance of individual isoforms for hepatic uptake of xenobiotics. 2. The present study focused on the use of siRNA technology to decrease OATP1B1 selectively in human hepatocytes. Following delivery of siRNA by the novel lipid, AtuFECT01, mRNA expression of OATP1B1 was reduced by 94%-98% with no significant toxicity. Off-target effects were also shown to be minimal as evidenced by the expression of common drug metabolizing enzymes, transporters, nuclear receptors and associated co-regulators. Uptake of estrone-3-sulfate (5 nM) by OATP1B1 was reduced by 82%-95%. This methodology was subsequently used to assess the relative contribution of OATP1B1 uptake in human hepatocytes for olmesartan (42%-62%), valsartan (28%-81%), rosuvastatin (64%-72%), pitavastatin (84%-98%) and lopinavir (64%-89%). These data are consistent with previous values obtained using a relative activity factor approach. 3. The siRNA approach provides a robust and reproducible method for assessing the relative contribution of OATP1B1 to hepatic uptake of new chemical entities. The technique also has potential utility in facilitating detailed characterization of drug-drug interactions involving hepatic drug transporters.
Authors:
B Williamson; A C Soars; A Owen; P White; R J Riley; M G Soars
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-3-6
Journal Detail:
Title:  Xenobiotica; the fate of foreign compounds in biological systems     Volume:  -     ISSN:  1366-5928     ISO Abbreviation:  Xenobiotica     Publication Date:  2013 Mar 
Date Detail:
Created Date:  2013-3-6     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1306665     Medline TA:  Xenobiotica     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Molecular and Clinical Pharmacology, University of Liverpool , Liverpool , UK .
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