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Apparent active transport of MDMA is not mediated by P‐glycoprotein: a comparison with MDCK and Caco‐2 monolayers
Author(s) -
Bertelsen Kirk M.,
Greenblatt David J.,
von Moltke Lisa L.
Publication year - 2006
Publication title -
biopharmaceutics and drug disposition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.419
H-Index - 58
eISSN - 1099-081X
pISSN - 0142-2782
DOI - 10.1002/bdd.501
Subject(s) - rhodamine 123 , chemistry , p glycoprotein , efflux , pharmacology , mdma , caco 2 , transporter , in vitro , biochemistry , biology , multiple drug resistance , gene , antibiotics
Abstract Amphetamines and their methylenedioxy derivatives generically display similar behavioral, physiologic and toxic effects. Inconsistent pharmacokinetic and toxicity data for methylenedioxymethamphetamine (MDMA) may suggest that active drug transporters are interacting with these compounds, and thus altering drug absorption and tissue distribution. In vitro models of CNS accumulation and intestinal drug transport were used to assess efflux transport of MDMA. Madin‐Darby kidney cell epithelial (MDCK) monolayers displayed a 4‐fold increase in accumulation in the basolateral to apical orientation relative to the apical to basolateral orientation, although no differential accumulation was noted between MDCK‐WT and MDCK‐MDR1 monolayers. Caco‐2 monolayers demonstrated an approximate 2‐fold increase in accumulation of MDMA. Exposure of various inhibitors of active drug transporters demonstrated mixed results; ritonavir, progesterone and indomethacin produced an approximately 50% reduction of MDMA transport, while verapamil, MK‐571 and probenecid had no effect. Based on these data, it is concluded that MDMA efflux is mediated via the activity of a transporter distinct from P‐glycoprotein. The possible inhibitory effects of amphetamines on rhodamine‐123 transport were also assessed. MDMA, methylenedioxyamphetamine, amphetamine and methamphetamine, at physiologically relevant concentrations, did not significantly alter the transport of rhodamine‐123 in Caco‐2 monolayers or the LS180 cell line, suggesting that these compounds do not alter the function of P‐glycoprotein. Copyright © 2006 John Wiley & Sons, Ltd.