Studies on the Binding Affinity of Anticancer Drug Mitoxantrone to Chromatin, DNA and Histone Proteins

Overview

Journal J Biomed Sci

Publisher Biomed Central

Specialty Biology

Date 2009 Mar 17

PMID 19284573

Citations 18

Authors

Zahra Hajihassan

Azra Rabbani-Chadegani

Affiliations

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Abstract

Mitoxantrone is a potent antitumor drug, widely used in the treatment of various cancers. In the present study, we have investigated and compared the affinity of anticancer drug, mitoxantrone, to EDTA-soluble chromatin (SE-chromatin), DNA and histones employing UV/Vis, fluorescence, CD spectroscopy, gel electrophoresis and equilibrium dialysis techniques. The results showed that the interaction of mitoxantrone with SE-chromatin proceeds into compaction/aggregation as revealed by reduction in the absorbencies at 608 and 260 nm (hypochromicity) and disappearance of both histones and DNA on the gels. Mitoxantrone interacts strongly with histone proteins in solution making structural changes in the molecule as shown by CD and fluorescence analysis. The binding isotherms demonstrate a positive cooperative binding pattern for the chromatin- mitoxantrone interaction. It is suggested higher binding affinity of mitoxantrone to chromatin compared to DNA implying that the histone proteins may play an important role in the chromatin- mitoxantrone interaction process.

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