title: P-glycoprotein-mediated in vitro biliary excretion in sandwich-cultured rat hepatocytes.
abstract: Recently, sandwich-cultured (SC) rat hepatocytes have been used as an in vitro model to assess biliary excretion of drugs and xenobiotics. The purpose of the present study was to validate the use of SC rat hepatocytes for the in vitro assessment of P-glycoprotein (P-gp)-mediated biliary drug excretion. The specific and fluorescent P-gp substrate rhodamine 123 (Rh123) and the P-gp substrate digoxin were selected as model compounds. Rh123 and digoxin accumulation and Rh123 efflux under standard and Ca(2+)-free conditions were quantified in SC rat hepatocytes to determine substrate secretion into canalicular networks in vitro. The major role of P-gp in the biliary excretion of these compounds was confirmed by inhibition experiments with the potent P-gp inhibitor GF120918. Hepatocyte culture conditions, including media type and time in culture, significantly affected Rh123 biliary excretion. P-gp expression, as assessed by Western blot, was increased with culture time. Dexamethasone (an in vivo inducer of P-gp) concentrations ranging from 0.01 to 1 microM in the cell culture medium did not influence P-gp expression or Rh123 biliary excretion. Rh123 and digoxin biliary clearance values, predicted from SC rat hepatocyte data, were consistent with values reported in vivo and in isolated perfused rat liver studies. In conclusion, the results of this study demonstrate the utility of SC rat hepatocytes as an in vitro model to study and predict the biliary excretion of P-gp substrates.
authors.affiliation: Division of Drug Delivery and Disposition, School of Pharmacy, University of North Carolina at Chapel Hill, 27599, USA.
authors.forename: P P
authors.initials: PP
authors.lastname: Annaert
authors.forename: R Z
authors.initials: RZ
authors.lastname: Turncliff
authors.forename: C L
authors.initials: CL
authors.lastname: Booth
authors.forename: D R
authors.initials: DR
authors.lastname: Thakker
authors.forename: K L
authors.initials: KL
authors.lastname: Brouwer
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000187:drug effects / Q000378:metabolism*; D000166:Acridines / Q000494:pharmacology; D000818:Animals; D001659:Biliary Tract / Q000187:drug effects / Q000378:metabolism*; D002118:Calcium / Q000172:deficiency / Q000378:metabolism; D018929:Cell Culture Techniques; D003470:Culture Media / Q000494:pharmacology; D003907:Dexamethasone / Q000494:pharmacology; D004077:Digoxin / Q000378:metabolism; D005938:Glucocorticoids / Q000494:pharmacology; D022781:Hepatocytes / Q000187:drug effects / Q000378:metabolism*; D007546:Isoquinolines / Q000494:pharmacology; D008297:Male; D008657:Metabolic Clearance Rate; D011137:Polystyrenes; D051381:Rats; D017208:Rats, Wistar; D020112:Rhodamine 123 / Q000493:pharmacokinetics*; D044005:Tetrahydroisoquinolines; D013997:Time Factors; D014316:Tritium
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000166:Acridines; D003470:Culture Media; D005938:Glucocorticoids; D007546:Isoquinolines; D011137:Polystyrenes; D044005:Tetrahydroisoquinolines; D014316:Tritium; D020112:Rhodamine 123; D004077:Digoxin; D003907:Dexamethasone; C083501:Elacridar; D002118:Calcium