Indolequinone Antitumor Agents: Correlation between Quinone Structure and Rate of Metabolism by Recombinant Human NAD(P)H:Quinone Oxidoreductase. Part 2
作者:Elizabeth Swann、Paola Barraja、Ann M. Oberlander、Walter T. Gardipee、Anna R. Hudnott、Howard D. Beall、Christopher J. Moody
DOI:10.1021/jm010884c
日期:2001.9.1
A series of indolequinones bearing various functional groups has been synthesized, and the effects of substituents on the metabolism of the quinones. by recombinant human NAD(P)H: quinone oxidoreductase (NQO1) were studied. Indolequinones were selected for study on the basis of the X-ray crystal structure of the human enzyme, and were designed to probe the effect of substituents particularly at N-1. Metabolism of the quinones. by NQO1 revealed that, in general, compounds with electron-withdrawing groups at the indole 3-position were among the best substrates, and that groups larger than methyl at N-1 are clearly tolerated. Compounds with a leaving group at the 3-indolyl methyl position generally inactivated the enzyme. The toxicity toward human colon carcinoma cells with either no detectable activity (BE-WT) or high NQO1 activity (BE-NQ) was also studied in representative quinones. The most toxic compounds were those with a leaving group at the C-3 position; these compounds were 1.1-5.3-fold more toxic. to the BE-NQ than the BE-WT cells.