title: Analysis of stereoelectronic properties of camptothecin analogues in relation to biological activity.
abstract: Camptothecin and four of its 10,11-methylenedioxy analogues were examined for their activity against the pathogenic protozoan Leishmania donovani in vitro. The methylenedioxy analogues were 36- to 180-fold more potent than the parent camptothecin, possessing IC50 values ranging from 160 to 32 nM against the parasite. Our finding that the methylenedioxy camptothecins possess greater activity than camptothecin, which is also the case for other cell types and for the generation of cleavable complex in the presence of DNA and purified mammalian topoisomerase I, prompted us to examine the molecular features of camptothecin and methylenedioxy camptothecin analogues. A delocalization of positive potential was observed in the methylenedioxy camptothecin analogues, which could increase the affinity of these molecules for DNA. In addition, geometrical and electronic differences between the E ring of camptothecin and its methylenedioxy analogues were noted. One or both of these factors may contribute to the superior biological activity of the methylenedioxy camptothecin analogues.
authors.affiliation: Department of Parasitologv, Walter Reed Army Institute of Research, Washington, DC 20307-5100, USA. karl.werbovetz@na.amedd.army.mil
authors.forename: K A
authors.initials: KA
authors.lastname: Werbovetz
authors.forename: A K
authors.initials: AK
authors.lastname: Bhattacharjee
authors.forename: J J
authors.initials: JJ
authors.lastname: Brendle
authors.forename: J P
authors.initials: JP
authors.lastname: Scovill
mesh_terms: D000818:Animals; D000977:Antiparasitic Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D002166:Camptothecin / Q000031:analogs & derivatives / Q000737:chemistry / Q000494:pharmacology*; D020128:Inhibitory Concentration 50; D007893:Leishmania donovani / Q000187:drug effects; D008958:Models, Molecular; D055672:Static Electricity; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D013816:Thermodynamics
chemical_list: D000977:Antiparasitic Agents; D002166:Camptothecin