Farnesoid X Receptor Agonists Obeticholic Acid and Chenodeoxycholic Acid Increase Bile Acid Efflux in Sandwich-Cultured Human Hepatocytes: Functional Evidence and Mechanisms
| Autor: | Cen Guo, Carl LaCerte, Kim L. R. Brouwer, Kenneth R. Brouwer, Jeffrey E. Edwards |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Adult
Male 0301 basic medicine medicine.drug_class Receptors Cytoplasmic and Nuclear Pharmacology Chenodeoxycholic Acid Metabolism Transport and Pharmacogenomics Bile Acids and Salts 03 medical and health sciences chemistry.chemical_compound Chenodeoxycholic acid medicine Humans Receptor Cells Cultured Bile acid Obeticholic acid Biological Transport Transporter 030104 developmental biology Nuclear receptor chemistry Hepatocytes Molecular Medicine Female Farnesoid X receptor Efflux |
| Zdroj: | Journal of Pharmacology and Experimental Therapeutics. 365:413-421 |
| ISSN: | 1521-0103 0022-3565 |
| DOI: | 10.1124/jpet.117.246033 |
| Popis: | The farnesoid X receptor (FXR) is a nuclear receptor that regulates genes involved in bile acid homeostasis. FXR agonists, obeticholic acid (OCA) and chenodeoxycholic acid (CDCA), increase mRNA expression of efflux transporters in sandwich-cultured human hepatocytes (SCHH). This study evaluated the effects of OCA and CDCA treatment on the uptake, basolateral efflux, and biliary excretion of a model bile acid, taurocholate (TCA), in SCHH. In addition, changes in the protein expression of TCA uptake and efflux transporters were investigated. SCHH were treated with 1 µM OCA, 100 µM CDCA, or vehicle control for 72 hours followed by quantification of deuterated TCA uptake and efflux over time in Ca(2+)-containing and Ca(2+)-free conditions (n = 3 donors). A mechanistic pharmacokinetic model was fit to the TCA mass-time data to obtain estimates for total uptake clearance (CL(Uptake)), total intrinsic basolateral efflux clearance (CL(int,BL)), and total intrinsic biliary clearance (CL(int,Bile)). Modeling results revealed that FXR agonists significantly increased CL(int,BL) by >6-fold and significantly increased CL(int,Bile) by 2-fold, with minimal effect on CL(Uptake). Immunoblotting showed that protein levels of the basolateral transporter subunits organic solute transporter α and β (OSTα and OSTβ) in FXR agonist-treated SCHH were significantly induced by >2.5- and 10-fold, respectively. FXR agonist-mediated changes in the expression of other TCA transporters in SCHH were modest. In conclusion, this is the first report demonstrating that OCA and CDCA increased TCA efflux in SCHH, which contributed to reduced intracellular TCA concentrations. Increased basolateral efflux of TCA was consistent with increased OSTα/β protein expression in OCA- and CDCA-treated SCHH. |
| Databáze: | OpenAIRE |
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