Abstract:
:ET-743 is a marine anti-cancer drug and is currently in phase I trials in which the effect of combination therapies will be investigated. Its dose-limiting toxicity in patients is hepatotoxicity. In-vitro studies have shown that ET-743 is mainly metabolized by cytochrome P450 (CYP) 3A4, but also by 2C9, 2C19, 2D6 and 2E1, and the phase II enzymes uridine diphosphoglucuronosyl transferase and glutathione-S-transferase. Based on this metabolic profile, there is a risk of drug-drug interactions possibly influencing the hepatotoxicity of ET-743. Therefore, the effect of CYP and phase II activity on the cytotoxicity of ET-743 was investigated in vitro in a human cell line model system. The effect of different CYP and phase II inhibitors and CYP inducers on ET-743 cytotoxicity was studied after 48 and 120 h of treatment in Hep G2 cells using different assays. Furthermore, the toxicity of ET-743 metabolites was investigated. Potent cytotoxic activity of ET-743 after 120 h treatment was observed, which could be increased in combination with the CYP inhibitors metyrapone (3A4), phenanthrene (substrate for 2E1, 3A4), piperonyl butoxide (3A), proadifen (2C9, 2E1, 3A4), ritonavir (3A4), and warfarin (2C9, 2C19). No effect on the cytotoxicity of ET-743 was observed in combination with phase II enzyme inhibition and CYP induction. CYP metabolites of ET-743 were less toxic compared with ET-743. These findings indicate that combination therapy of ET-743 with CYP inhibitors, e.g. other anti-cancer drugs, could lead to changes in the hepatotoxicity of ET-743 and are therefore of clinical importance.
journal_name
Anticancer Drugsjournal_title
Anti-cancer drugsauthors
Brandon EF,Meijerman I,Klijn JS,den Arend D,Sparidans RW,Lázaro LL,Beijnen JH,Schellens JHdoi
10.1097/01.cad.0000180121.16407.38subject
Has Abstractpub_date
2005-10-01 00:00:00pages
935-43issue
9eissn
0959-4973issn
1473-5741pii
00001813-200510000-00005journal_volume
16pub_type
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