Antimalarial 9-anilinoacridine compounds directed at hematin.

Abstract:

:Antimalarial 9-anilinoacridines are potent inhibitors of parasite DNA topoisomerase II both in vitro and in situ. 3,6-diamino substitution on the acridine ring greatly improves parasiticidal activity against Plasmodium falciparum by targeting DNA topoisomerase II. A series of 9-anilinoacridines were investigated for their abilities to inhibit beta-hematin formation, to form drug-hematin complexes, and to enhance hematin-induced lysis of red blood cells. Inhibition of beta-hematin formation was minimal with 3,6-diamino analogs of 9-anilinoacridine and greatest with analogs with a 3,6-diCl substitution together with an electron-donating group in the 1'-anilino position. On the other hand, the presence of a 1'-N(CH3)2 group in the anilino ring produced compounds that strongly inhibited beta-hematin formation but which did not appear to be sensitive to the nature of the substitutions in the acridine nucleus. The derivatives bound hematin, and Job's plots of UV-visible absorbance changes in drug-hematin complexes at various molar ratios indicated a stoichiometric ratio of 1:2. The drugs enhanced hematin-induced red blood cell lysis at low concentrations (<4 microM). These studies open up the novel possibility of development of 9-anilinoacridine antimalarials that target not only DNA topoisomerase II but also beta-hematin formation, which should help delay the rapid onset of resistance to drugs acting at only a single site.

authors

Auparakkitanon S,Noonpakdee W,Ralph RK,Denny WA,Wilairat P

doi

10.1128/aac.47.12.3708-3712.2003

subject

Has Abstract

pub_date

2003-12-01 00:00:00

pages

3708-12

issue

12

eissn

0066-4804

issn

1098-6596

journal_volume

47

pub_type

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