African Health Sciences
Makerere University Medical School
Vol. 15, No. 4, 2015, pp. 1271-1276
Bioline Code: hs15174
Full paper language: English
Document type: Research Article
Document available free of charge
African Health Sciences, Vol. 15, No. 4, 2015, pp. 1271-1276
© Copyright 2015 - African Health Sciences
Ketolide agents HMR 3004 and HMR 3647 (telithromycin) inhibit the growth of Plasmodium falciparum in vitro|
Makgatho, Marema; Maimela, Eric & Mbajiorgu, Felix
Background: Malaria is on the increase due to emergence of parasite drug resistance and there is thus an urgent need for
the development of new antiparasitic drugs effective at low concentrations. Ketolides antibiotics are used for treatment of
various ailments and are relevant candidates to establish antiparasitic activity.
Objectives: The present study investigates the activity of ketolide compounds HMR 3004 and HMR 3647 (telithromycin)
(0.025-12.5 μM) for activity against chloroquine-sensitive and resistant strains of Plasmodium falciparum in vitro.
Methods: The antiplasmodial activity of the two ketolide agents were determined using microscopic and colorimetric [lactate
dehydrogenase assay] procedures.
Results: Both HMR 3004 and HMR 3647 caused a dose-dependent inhibition of growth of both parasite strains with IC50
values 3 and 15 nM, respectively. Suppression of parasite growth was evident after 8 hours of exposure to both agents at
12.5 μM with total parasite clearance achieved at 40 hours.
Conclusion: The results indicate lack of cross-resistance between the ketolide compounds and chloroquine, implying presence
of a drug target different from that of chloroquine. The particular drug target has still to be investigated but the
stage-specific results indicate that it is expressed in all parasite growth phases. These observations demonstrate the anti-malarial
potential of the ketolide antimicrobial agents.
Chloroquine; ketolides; macrolides; malaria; Plasmodium falciparum