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. 1997 Dec;73(6):3317–3327. doi: 10.1016/S0006-3495(97)78356-5

Localization and molecular interactions of mitoxantrone within living K562 cells as probed by confocal spectral imaging analysis.

A Feofanov 1, S Sharonov 1, I Kudelina 1, F Fleury 1, I Nabiev 1
PMCID: PMC1181233  PMID: 9414242

Abstract

Studying mechanisms of drug antitumor action is complicated by the lack of noninvasive methods enabling direct monitoring of the state and interactions of the drugs within intact viable cells. Here we present a confocal spectral imaging (CSI) technique as a method of overcoming this problem. We applied this method to the examination of localization and interactions of mitoxantrone (1, 4-dihydroxy-5, 8-bis-[([2-(2-hydroxyethyl)-amino]ethyl)amino]-9,10-anthracenedione dihydrochloride), a potent antitumor drug, in living K562 cells. A two-dimensional set of fluorescence spectra of mitoxantrone (MITOX) recorded with micron resolution within a drug-treated cell was analyzed to reveal formation of drug-target complexes and to create the maps of their intracellular distribution. The analysis was based on detailed in vitro modeling of drug-target (DNA, RNA, DNA topoisomerase II) interactions and environmental effects affecting drug fluorescence. MITOX exposed to aqueous intracellular environment, MITOX bound to hydrophobic cellular structures, complexes of MITOX with nucleic acids, as well as the naphtoquinoxaline metabolite of MITOX were simultaneously detected and mapped in K562 cells. These states and complexes are known to be immediately related to the antitumor action of the drug. The results obtained present a basis for the subsequent quantitative analysis of concentration and time-dependent accumulation of free and bound MITOX within different compartments of living cancer cells.

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