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Population pharmacokinetic modeling and deconvolution of enantioselective absorption of eflornithine in the rat.

Journal article
Authors Carl-Christer Johansson
Peter Gennemark
Per Artursson
Angela Abelö
Michael Ashton
Rasmus Jansson Löfmark
Published in Journal of pharmacokinetics and pharmacodynamics
Volume 40
Issue 1
Pages 117-28
ISSN 1573-8744
Publication year 2013
Published at Institute of Neuroscience and Physiology, Department of Pharmacology
Pages 117-28
Language en
Links dx.doi.org/10.1007/s10928-012-9293-...
Keywords Absorption, Animals, Biological Availability, Caco-2 Cells, Cell Line, Tumor, Eflornithine, pharmacokinetics, Enzyme Inhibitors, pharmacokinetics, Humans, Male, Metabolic Clearance Rate, Models, Biological, Rats, Rats, Sprague-Dawley, Stereoisomerism
Subject categories Pharmacy

Abstract

Enantioselective pharmacokinetics and absorption of eflornithine in the rat was investigated using population pharmacokinetic modeling and a modified deconvolution method. Bidirectional permeability of L- and D-eflornithine was investigated in Caco-2 cells. The rat was administered racemic eflornithine hydrochloride as a single oral dose [40-3,000 mg/kg bodyweight (BW)] or intravenously (IV) (100-2,700 mg/kg BW infused over 60-400 min). Serial arterial blood samples were collected and L- and D-eflornithine were quantitated with a previously published chiral bioanalysis method. The D:L concentration ratio was determined in rat faeces. Intravenous L-and D-eflornithine plasma concentration-time data was analyzed using population pharmacokinetic modeling and described with a 3-compartment pharmacokinetic model with saturable binding to one of the peripheral compartments. Oral plasma concentration-time data was analyzed using a modified deconvolution method accounting for nonlinearities in the eflornithine pharmacokinetics. Clearance was similar for both enantiomers (3.36 and 3.09 mL/min). Oral bioavailability was estimated by deconvolution at 30 and 59% for L- and D-eflornithine. The D:L concentration ratio in feces was 0.49 and the Caco-2 cell permeability was similar for both enantiomers (6-10 × 10(-8) cm/s) with no evident involvement of active transport or efflux. The results presented here suggest that the difference in the bioavailability between eflornithine enantiomers is caused by a stereoselective difference in extent rather than rate of absorption. The presented modified deconvolution method made it possible to account for the non-linear component in the suggested three-compartment pharmacokinetic model thus rapidly estimating eflornithine oral bioavailability.

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