Salen-anthraquinone Conjugates. Synthesis, DNA-binding and cleaving properties, effects on topoisomerases and cytotoxicity
摘要:
A series of amidoethylamino-anthraquinone derivatives bearing either one or two salen (bis(salicylidene)ethylenediamine) moieties complexed with Cu-II or Ni-II have been synthesized, and their DNA-binding and cleaving properties examined. The effects of the mono- and di-substituted anthracenedione-salen conjugates on DNA cleavage mediated by topoisomerases I and II have also been determined, as well as their cytotoxicity toward human KB cells. The anthraquinone-salen . Ni-II conjugates bind to CC-rich sequences in DNA, but do not cleave the macromolecule. By contrast, the anthraquinone-salen . Cu-II hybrids do not recognize particular nucleotide sequences but efficiently induce single-strand breaks in DNA after activation. The 5,8-dihydroxy-anthraquinone conjugates are more cytotoxic and more potent toward topoisomerase II than the non-hydroxylated analogues, but they are less cytotoxic than the salen-free anthraquinones. The attachment of a salen . Cu-II complex to the anthra quinone chromophore can confer DNA cleaving properties in vitro, but this is at the expense of cytotoxic activity. Anthraquinone-salen . Cu-II complexes may find useful employ as footprinting probes for investigating ligand-DNA interactions. Copyright (C) 1996 Elsevier Science Ltd
Salen-anthraquinone Conjugates. Synthesis, DNA-binding and cleaving properties, effects on topoisomerases and cytotoxicity
摘要:
A series of amidoethylamino-anthraquinone derivatives bearing either one or two salen (bis(salicylidene)ethylenediamine) moieties complexed with Cu-II or Ni-II have been synthesized, and their DNA-binding and cleaving properties examined. The effects of the mono- and di-substituted anthracenedione-salen conjugates on DNA cleavage mediated by topoisomerases I and II have also been determined, as well as their cytotoxicity toward human KB cells. The anthraquinone-salen . Ni-II conjugates bind to CC-rich sequences in DNA, but do not cleave the macromolecule. By contrast, the anthraquinone-salen . Cu-II hybrids do not recognize particular nucleotide sequences but efficiently induce single-strand breaks in DNA after activation. The 5,8-dihydroxy-anthraquinone conjugates are more cytotoxic and more potent toward topoisomerase II than the non-hydroxylated analogues, but they are less cytotoxic than the salen-free anthraquinones. The attachment of a salen . Cu-II complex to the anthra quinone chromophore can confer DNA cleaving properties in vitro, but this is at the expense of cytotoxic activity. Anthraquinone-salen . Cu-II complexes may find useful employ as footprinting probes for investigating ligand-DNA interactions. Copyright (C) 1996 Elsevier Science Ltd
A novel group of cytotoxic anthraquinone derivatives, 1-[(aminoalkyl)amino]-4-hydroxy-10-imino-9-anthracenones, has been synthesized. It has been shown that imino analogues of the anthracenediones exhibit diminished ability to generate oxygen radicals. The cytotoxic activity of iminoanthracenones obtained was lower than that of the related quinone carbonyl analogues. One of the obtained imino compounds