title: Efflux Transport Characterization of Resveratrol Glucuronides in UDP-Glucuronosyltransferase 1A1 Transfected HeLa Cells: Application of a Cellular Pharmacokinetic Model to Decipher the Contribution of Multidrug Resistance-Associated Protein 4.
abstract: Resveratrol undergoes extensive metabolism to form biologically active glucuronides in humans. However, the transport mechanisms for resveratrol glucuronides are not fully established. Here, we aimed to characterize the efflux transport of resveratrol glucuronides using UGT1A1-overexpressing HeLa cells (HeLa1A1 cells), and to determine the contribution of multidrug resistance-associated protein (MRP) 4 to cellular excretion of the glucuronides. Two glucuronide isomers [i.e., resveratrol 3-O-glucuronide (R3G) and resveratrol 4'-O-glucuronide (R4'G)] were excreted into the extracellular compartment after incubation of resveratrol (1-100 μM) with HeLa1A1 cells. The excretion rate was linearly related to the level of intracellular glucuronide, indicating that glucuronide efflux was a nonsaturable process. MK-571 (a dual inhibitor of UGT1A1 and MRPs) significantly decreased the excretion rates of R3G and R4'G while increasing their intracellular levels. Likewise, short-hairpin RNA (shRNA)-mediated silencing of MRP4 caused a significant reduction in glucuronide excretion but an elevation in glucuronide accumulation. Furthermore, β-glucuronidase expressed in the cells catalyzed the hydrolysis of the glucuronides back to the parent compound. A cellular pharmacokinetic model integrating resveratrol transport/metabolism with glucuronide hydrolysis/excretion was well fitted to the experimental data, allowing derivation of the efflux rate constant values in the absence or presence of shRNA targeting MRP4. It was found that a large percentage of glucuronide excretion (43%-46%) was attributed to MRP4. In conclusion, MRP4 participated in cellular excretion of R3G and R4'G. Integration of mechanistic pharmacokinetic modeling with transporter knockdown was a useful method to derive the contribution percentage of an exporter to overall glucuronide excretion.
authors.affiliation: Division of Pharmaceutics, College of Pharmacy (S.W., E.Q., B.W.), and Guangzhou Jinan Biomedicine Research and Development Center (F.L., D.D.), Jinan University, Guangzhou, China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Wang
authors.affiliation: Division of Pharmaceutics, College of Pharmacy (S.W., E.Q., B.W.), and Guangzhou Jinan Biomedicine Research and Development Center (F.L., D.D.), Jinan University, Guangzhou, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Li
authors.affiliation: Division of Pharmaceutics, College of Pharmacy (S.W., E.Q., B.W.), and Guangzhou Jinan Biomedicine Research and Development Center (F.L., D.D.), Jinan University, Guangzhou, China.
authors.forename: Enxi
authors.initials: E
authors.lastname: Quan
authors.affiliation: Division of Pharmaceutics, College of Pharmacy (S.W., E.Q., B.W.), and Guangzhou Jinan Biomedicine Research and Development Center (F.L., D.D.), Jinan University, Guangzhou, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Dong
authors.affiliation: Division of Pharmaceutics, College of Pharmacy (S.W., E.Q., B.W.), and Guangzhou Jinan Biomedicine Research and Development Center (F.L., D.D.), Jinan University, Guangzhou, China bj.wu@hotmail.com.
authors.forename: Baojian
authors.initials: B
authors.lastname: Wu
mesh_terms: D001692:Biological Transport / Q000187:drug effects / Q000502:physiology; D004305:Dose-Response Relationship, Drug; D045604:Extracellular Fluid / Q000187:drug effects / Q000378:metabolism*; D055785:Gene Knockdown Techniques; D020719:Glucuronides / Q000378:metabolism*; D014453:Glucuronosyltransferase / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans; D017706:Lisinopril / Q000378:metabolism / Q000494:pharmacology; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000235:genetics / Q000378:metabolism*; D013267:Stilbenes / Q000378:metabolism*; D014162:Transfection / Q000379:methods; D000099148:UGT1A1 Enzyme
chemical_list: D020719:Glucuronides; D014453:Glucuronosyltransferase; D017706:Lisinopril; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D013267:Stilbenes; D000099148:UGT1A1 Enzyme; C073492:ABCC4 protein, human; C499731:resveratrol-4'-O-glucuronide