ToxSci Advance Access published online on August 14, 2008
Toxicological Sciences, doi:10.1093/toxsci/kfn161
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Critical Role of PPAR
in Perfluorooctanoic Acid- and Perfluorodecanoic Acid-Induced Down-regulation of Oatp Uptake Transporters in Mouse Livers
Department of Pharmacology, Toxicology, and Therapeutics, University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160
* Corresponding author: Curtis D. Klaassen, PhD. Department of Pharmacology, Toxicology, and Therapeutics. University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, Phone: 913-588-7714, Fax: 913-588-7501, E-mail: cklaasse{at}kumc.edu
Received June 2, 2008; revision received August 5, 2008; accepted August 6, 2008
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Abstract |
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Perfluorooctanoic acid (PFOA) and perfluorodecanoic acid (PFDA) have been detected globally in wildlife and humans. Data from a gene array indicate that PFOA decreases organic anion transporting polypeptides (Oatps) in liver. Na+-taurocholate cotransporting polypeptide (Ntcp) and Oatp1a1, 1a4, and 1b2 are major transporters responsible for uptake of bile acids (BAs) and other organic compounds into liver. The purpose of the present study was to determine the effects of two perfluorinated fatty acids, PFOA and perfluorodecanoic acid (PFDA), on mRNA and protein expression of hepatic uptake transporters Oatps and Ntcp, and to determine the underlying regulatory mechanisms by using PPAR
-, CAR-, PXR-, Nrf2-, and FXR-null mouse models. After two days following a single i.p. administration, PFOA did not alter serum BA concentrations, but PFDA increased serum BA concentrations 300%. Furthermore, PFOA decreased mRNA and protein expression of Oatp1a1, 1a4, and 1b2, but not Ntcp in mouse liver. In contrast, PFDA decreased mRNA and protein expression of all four transporters, and decreased the mRNA expression in a dose-dependent manner, with the decrease of Oatp1a4 occurring at lower doses than the other three transporters. Multiple mechanisms are likely involved in the down-regulation of mouse Oatps and Ntcp by PFDA. By using the various transcription factor-null mice, PPAR was shown to play a central role in the down-regulation of Oatp1a1, 1a4, 1b2, and Ntcp by PFDA. The current studies provide important insight into understanding the mechanisms by which PFDA regulate the expression of hepatic uptake transporters. In conclusion, PFOA and PFDA decrease mouse liver uptake transporters primarily via activation of PPAR.
Key Words: Na+-taurocholate cotransporting polypeptide (Ntcp); Organic anion transporting polypeptide (Oatp); perfluorodecanoic acid (PFDA); perfluorooctanoic acid (PFOA); peroxisome proliferator-activated receptor alpha (PPAR).
E-mail for each author: Xingguo Cheng, scheng{at}kumc.edu; Curtis D. Klaassen, cklaasse{at}kumc.edu.
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