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Palabras contadas: methoxyphenylimine: 1, lapachone: 19, 4: 198
Reinicke, K.E. - Bey, E.A. - Bentle, M.S. - Pink, J.J. - Ingalls, S.T. - Hoppel, C.L. - Misico, R.I. - Arzac, G.M. - Burton, G. - Bornmann, W.G. - Sutton, D. - Gao, J. - Boothman, D.A.
Clin. Cancer Res. 2005;11(8):3055-3064
2005
Temas: 2,2 dimethyl 6 (4 bromophenylimino) 3,4,5,6 tetrahydro 2h naphth[1,2 b]oxin 5 one - 2,2 dimethyl 6 (4 methoxyphenylimino) 3,4,5,6 tetrahydro 2h naphth[1,2 b]oxin 5 one - 2,2 dimethyl 6 (4 methylphenylimino) 3,4,5,6 tetrahydro 2h naphth[1,2 b]oxin 5 one - 2,2 dimethyl 6 (4 nitrophenylimino) 3,4,5,6 tetrahydro 2h naphth[1,2 b]oxin 5 one - 2,2 dimethyl 6 phenylimino 3,4,5,6 tetrahydro 2h naphth[1,2 b]oxin 5 one - 4 bromophenylimine lapachone - 4 methoxyphenylimine lapachone - 4 methylphenylimine lapachone - 4 nitrophenylimine lapachone - acetylcysteine
Descripción: β-Lapachone, an o-naphthoquinone, induces a novel caspase- and p53-independent apoptotic pathway dependent on NAD (P) H:quinone oxidoreductase 1 (NQO1). NQO1 reduces β-lapachone to an unstable hydroquinone that rapidly undergoes a two-step oxidation back to the parent compound, perpetuating a futile redox cycle. A deficiency or inhibition of NQO1 rendered cells resistant to beta;-lapachone. Thus, β-lapachone has great potential for the treatment of specific cancers with elevated NQO1 levels (e.g., breast, non - small cell lung, pancreatic, colon, and prostate cancers). We report the development of mono(arylimino) derivatives of β-lapachone as potential prodrugs. These derivatives are relatively nontoxic and not substrates for NQO1 when initially diluted in water. In solution, however, they undergo hydrolytic conversion to β-lapachone at rates dependent on the electron-withdrawing strength of their substituent groups and pH of the diluent. NQO1 enzyme assays, UV-visible spectrophotometry, high-performance liquid chromatography-electrospray ionization-mass spectrometry, and nuclear magnetic resonance analyses confirmed and monitored conversion of each derivative to β-lapachone. Once converted, β-lapachone derivatives caused NQO1-dependent, μ-calpain-mediated cell death in human cancer cells identical to that caused by β-lapachone. Interestingly, coadministration of N-acetyt-L-cysteine prevented derivative-induced cytotoxicity but did not affect β-lapachone lethality. Nuclear magnetic resonance analyses indicated that prevention of β-lapachone derivative cytotoxicity was the result of direct modification of these derivatives by N-acetyl-L-cysteine, preventing their conversion to β-lapachone. The use of β-lapachone mono(arylimino) prodrug derivatives, or more specifically a derivative converted in a tumor-specific manner (i.e., in the acidic local environment of the tumor tissue), should reduce normal tissue toxicity while eliciting tumor-selective cell killing by NQO1 bioactivation. © 2005 American Association for Cancer Research.
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