TY - JOUR T1 - P-Glycoprotein-Mediated In Vitro Biliary Excretion in Sandwich-Cultured Rat Hepatocytes JF - Drug Metabolism and Disposition JO - Drug Metab Dispos SP - 1277 LP - 1283 VL - 29 IS - 10 AU - Pieter P. Annaert AU - Ryan Z. Turncliff AU - Catherine L. Booth AU - Dhiren R. Thakker AU - Kim L. R. Brouwer Y1 - 2001/10/01 UR - http://dmd.aspetjournals.org/content/29/10/1277.abstract N2 - 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 Ca2+-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 μM 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. The American Society for Pharmacology and Experimental Therapeutics ER -