Organic Anion Transporting Polypeptide-Mediated Hepatic Uptake of Glucuronide Metabolites of Androgens. 2020

Cindy Yanfei Li, and Anshul Gupta, and Zsuzsanna Gáborik, and Emese Kis, and Bhagwat Prasad
Department of Pharmaceutics, University of Washington, Seattle, Washington (C.Y.L.); Amgen Research, Department of Pharmacokinetics and Drug Metabolism, Cambridge, Massachusetts (A.G.); SOLVO Biotechnology, Budapest, Hungary (Z.G., E.K.); Department of Pharmaceutical Sciences, Washington State University, Spokane, Washington (B.P.).

We previously established that androgen glucuronides are effluxed by multidrug resistance-associated proteins 2 and 3. However, no data exist on the mechanism of hepatic uptake of these metabolites. The first goal of this study was to explore the role of hepatic uptake transporters and characterize transport kinetics of glucuronides of testosterone (TG), dihydrotestosterone (DHTG), androsterone (AG), and etiocholanolone (EtioG) using cell lines overexpressing organic anion transporting polypeptides (OATP1B1, OATP1B3, and OATP2B1). Using a quantitative proteomics-guided approach, we then estimated the fractional contribution of individual OATPs in hepatic uptake of these glucuronides. The transport screening assays revealed that the glucuronides were primarily taken up by OATP1B1 and OATP1B3. The K m values for OATP1B1-mediated uptake were low for EtioG (6.2 µM) as compared with AG, TG, and DHTG (46.2, 56.7, and 71.3 µM, respectively), whereas the K m value for OATP1B3-mediated uptake for EtioG, AG, DHTG, and TG were 19.8, 29.3, 69.6, and 110.4 µM, respectively. Both OATP1B1 and OATP1B3 exhibited the highest transport rate toward AG as compared with other glucuronides. When adjusted for the transporter abundance in human livers, EtioG and DHTG were predicted to be transported by both OATP1B1 and OATP1B3, whereas TG and AG were preferentially (>68%) transported by OATP1B3. Collectively, this report elucidates the mechanisms of hepatic uptake of androgen glucuronides. Perturbation of these processes by genetic polymorphisms, disease conditions, or drug interactions can lead to changes in enterohepatic recycling of androgens. TG and AG can be further investigated as potential biomarkers of OATP1B3 inhibition. SIGNIFICANCE STATEMENT: This is the first study to elucidate the mechanism of hepatic uptake of androgen glucuronides and estimate the fractional contribution of individual OATPs using quantitative proteomics. Our results show that both OATP1B1 and OATP1B3 are responsible for the hepatic uptake of major circulating testosterone glucuronides. The apparent higher selectivity of OATP1B3 toward testosterone glucuronide and androsterone glucuronide can be leveraged for establishing these metabolites as clinical biomarkers of OATP1B3 activity.

UI MeSH Term Description Entries
D008099 Liver A large lobed glandular organ in the abdomen of vertebrates that is responsible for detoxification, metabolism, synthesis and storage of various substances. Livers
D002460 Cell Line Established cell cultures that have the potential to propagate indefinitely. Cell Lines,Line, Cell,Lines, Cell
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000074542 Solute Carrier Organic Anion Transporter Family Member 1B3 A sodium-independent organic anion transporter that functions in the uptake of various drugs and endogenous compounds including ESTRADIOL; TAUROCHOLATE; LEUKOTRIENE C4; and METHOTREXATE. It also functions in clearing BILE ACIDS and organic anions from the liver. Mutations in the SLCO1B3 gene are associated with Rotor Type HYPERBILIRUBINEMIA. Liver-Specific Organic Anion Transporter-2,OATP1B3 Protein,OATP8 Protein,SLC21A8 Protein,SLCO1B3 Protein,Solute Carrier Family 21 Member 8 Protein,Liver Specific Organic Anion Transporter 2
D000728 Androgens Compounds that interact with ANDROGEN RECEPTORS in target tissues to bring about the effects similar to those of TESTOSTERONE. Depending on the target tissues, androgenic effects can be on SEX DIFFERENTIATION; male reproductive organs, SPERMATOGENESIS; secondary male SEX CHARACTERISTICS; LIBIDO; development of muscle mass, strength, and power. Androgen,Androgen Receptor Agonist,Androgen Effect,Androgen Effects,Androgen Receptor Agonists,Androgenic Agents,Androgenic Compounds,Agents, Androgenic,Agonist, Androgen Receptor,Agonists, Androgen Receptor,Compounds, Androgenic,Effect, Androgen,Effects, Androgen,Receptor Agonist, Androgen,Receptor Agonists, Androgen
D001692 Biological Transport The movement of materials (including biochemical substances and drugs) through a biological system at the cellular level. The transport can be across cell membranes and epithelial layers. It also can occur within intracellular compartments and extracellular compartments. Transport, Biological,Biologic Transport,Transport, Biologic
D057809 HEK293 Cells A cell line generated from human embryonic kidney cells that were transformed with human adenovirus type 5. 293T Cells,HEK 293 Cell Line,HEK 293 Cells,Human Embryonic Kidney Cell Line 293,Human Kidney Cell Line 293,293 Cell, HEK,293 Cells, HEK,293T Cell,Cell, 293T,Cell, HEK 293,Cell, HEK293,Cells, 293T,Cells, HEK 293,Cells, HEK293,HEK 293 Cell,HEK293 Cell
D020719 Glucuronides Glycosides of GLUCURONIC ACID formed by the reaction of URIDINE DIPHOSPHATE GLUCURONIC ACID with certain endogenous and exogenous substances. Their formation is important for the detoxification of drugs, steroid excretion and BILIRUBIN metabolism to a more water-soluble compound that can be eliminated in the URINE and BILE. Glucuronide
D027361 Organic Anion Transporters Proteins involved in the transport of organic anions. They play an important role in the elimination of a variety of endogenous substances, xenobiotics and their metabolites from the body. Membrane Transport Proteins, Organic Anion,OAT Transport Protein,OATP Transporter,Organic Anion Transport Polypeptide,Organic Anion Transport Polypeptides,Organic Anion Transport Protein,Organic Anion Transporter,OAT Transport Proteins,OATP Proteins,OATP Transporters,Organic Anion Transport Proteins,Anion Transporter, Organic,Anion Transporters, Organic,Protein, OAT Transport,Transport Protein, OAT,Transport Proteins, OAT,Transporter, OATP,Transporter, Organic Anion,Transporters, OATP,Transporters, Organic Anion
D027381 Liver-Specific Organic Anion Transporter 1 An organic anion transporter found in human and mouse liver. It is capable of transporting a variety organic anions and mediates sodium-independent uptake of bile in the liver. LST-1 Transport Protein,Organic Anion Transport Polypeptide C,Liver-Specific Organic Anion Transporter, LST-1,Oatp-C Transport Protein,SLC21A6 Transporter,Solute Carrier Family-21(Organic Anion Transporter), Member 6 Protein,LST 1 Transport Protein,Liver Specific Organic Anion Transporter 1,Liver Specific Organic Anion Transporter, LST 1,Oatp C Transport Protein,Transport Protein, LST-1,Transport Protein, Oatp-C,Transporter, SLC21A6

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