Abstract
Malaria is still a major threat in many parts of the world with resistance spreading to almost all classes of antimalarials. The limited arsenal of available antimalarial drugs emphasizes the urgent need for novel antimalarial compounds. Owing to the fact that novel leads from nature have traditionally played a pivotal role in the development of various classes of antimalarials, we investigated a set of eight naturally occurring dietary flavonoids and their analogues for their antiplasmodial activity on clinical field isolates in southeastern Bangladesh and culture-adapted chloroquine-sensitive and chloroquine-resistant parasite clones. Except for taxifolin, all the other flavonoids had 50% inhibitory concentrations below 14 μM, both in the field and laboratory-adapted parasites. Neither of the flavonoids showed any activity correlation with chloroquine. The quercetin analogue rutin (7.10 ± 10.32 μM) was the most active substance in field isolates as well as laboratory-adapted cultures (3.53 ± 13.34 μM in 3D7 and 10.38 ± 15.08 μM in K1), providing the first evidence of its activity against Plasmodium falciparum parasites. Thus, our results provide important evidence of the antimalarial activity of flavonoids in traditional use and thus warrant further investigation of these compounds as potential antiplasmodial agents.
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Acknowledgments
We thank all the study participants, the staff of the Sardar Hospital Bandarban, the Civil Surgeon’s Office Bandarban, the Ministry of Health and Family Welfare, and the local community for their support and cooperation. The authors would like to thank Prof. Hans Goldenberg and Medical University Vienna for their kind financial support for Deepa Ganesh. This study was supported by the Malaria Research Initiative Bandarban (MARIB).
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Ganesh, D., Fuehrer, HP., Starzengrüber, P. et al. Antiplasmodial activity of flavonol quercetin and its analogues in Plasmodium falciparum: evidence from clinical isolates in Bangladesh and standardized parasite clones. Parasitol Res 110, 2289–2295 (2012). https://doi.org/10.1007/s00436-011-2763-z
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DOI: https://doi.org/10.1007/s00436-011-2763-z