Antiparasitic activities and toxicities of individual enantiomers of the 8-aminoquinoline 8-[(4-amino-1-methylbutyl)amino]-6-methoxy-4-methyl-5-[3,4-dichloropheno xy]quinoline succinate


Nanayakkara, NP; Ager, AL; Bartlett, MS; Yardley, V; Croft, SL; Khan, IA; McChesney, JD; Walker, LA; (2008) Antiparasitic activities and toxicities of individual enantiomers of the 8-aminoquinoline 8-[(4-amino-1-methylbutyl)amino]-6-methoxy-4-methyl-5-[3,4-dichloropheno xy]quinoline succinate. Antimicrobial agents and chemotherapy, 52 (6). pp. 2130-2137. ISSN 0066-4804 DOI: https://doi.org/10.1128/aac.00645-07

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Abstract

8-Aminoquinolines are an important class of antiparasitic agents, with broad utility and excellent efficacy, but also limitations due to hematological toxicities, primarily methemoglobinemia and hemolysis. One representative from this class, (+/-) -8- [(4-amino-1-methylbutyl)amino] -6-methoxy-4-methyl-5- [3,4-dichlorophenoxy]quinoline succinate (NPC1161C), proved extremely efficacious in animal models of malaria and pneumocystis pneumonia. This racemic mixture was separated into its component enantiomers by chemical and chromatographic means. The enantiomers were evaluated for antiparasitic activity in murine models of Plasmodium berghei, Pneumocystis carinii, and Leishmania donovani infection, as well as the propensity to elicit hematotoxicity in dogs. The (-)-enantiomer NPC1161B was found to be more active (by severalfold, depending on the dosing regimen) than the (+)-enantiomer NPC1161A in all of these murine models. In addition, the (-) enantiomer showed markedly reduced general toxicity in mice and reduced hematotoxicity in the dog model of methemoglobinemia. It is concluded that the configuration at the asymmetric center in the 8-amino side chain differentially affects efficacy and toxicity profiles and thus may be an important determinant of the "therapeutic window" for compounds in this class.

Item Type: Article
Keywords: PNEUMOCYSTIS-CARINII-PNEUMONIA, INDUCED HEMOLYTIC-ANEMIA, RED-BLOOD-CELLS, VISCERAL LEISHMANIASIS, IN-VITRO, PRIMAQUINE, METABOLITES, CLINDAMYCIN PRIMAQUINE, INDUCED METHEMOGLOBINEMIA, PUTATIVE METABOLITES, PLASMODIUM-BERGHEI, PNEUMOCYSTIS-CARINII-PNEUMONIAINDUCED HEMOLYTIC-ANEMIARED-BLOOD-CELLSVISCERAL LEISHMANIASISIN-VITROPRIMAQUINEMETABOLITESCLINDAMYCIN PRIMAQUINEINDUCED METHEMOGLOBINEMIAPUTATIVE METABOLITESPLASMODIUM-BERGHEI
Faculty and Department: Faculty of Infectious and Tropical Diseases > Dept of Immunology and Infection
Research Centre: Leishmaniasis Group
Web of Science ID: 256272700030
URI: http://researchonline.lshtm.ac.uk/id/eprint/6183

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