Abstract
Cremophor EL, a surfactant used in the clinical formulation of cyclosporine and paclitaxel, will reverse the multidrug resistance (MDR) phenotype in vitro. As other MDR modulators can alter the pharmacokinetics of cytotoxic drugs, the aim of this study was to examine the effect of Cremophor and another MDR-reversing surfactant, Tween 80, on the hepatic elimination and biliary excretion of etoposide. Using the isolated perfused rat-liver model with 80 ml recirculating perfusate containing 20% red blood cells and 4% bovine serum albumin, etoposide (1.6 mg) with and without Cremophor (800 or 80 mg) or Tween 80 (80 mg) was given into the perfusate reservoir, and perfusate and bile samples were collected for 3 h. Etoposide was measured by high-performance liquid chromatography (HPLC) and Cremophor was measured using a bioassay. Both surfactants changed the etoposide elimination profile from biphasic to monophasic. High-dose Cremophor increased the AUC (from 334 +/- 23 to 1540 +/- 490 microgram min ml(-1), P<0.05) and decreased the total clearance (from 4.8 +/- 0.3 to 1.1 +/- 0.3 ml/min, P<0.05) and biliary clearance (from 2.6 +/- 1.1 to 0.5 +/- 0.2 ml/min, p<0.05) but decreased the elimination half-life (from 62 +/- 17 to 40 +/- 5 m...Continue Reading
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