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Antiplasmodial activity of botanical extracts against Plasmodium falciparum

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Abstract

The absence of a vaccine and the rampant resistance to almost all antimalarial drugs have accentuated the urgent need for new antimalarial drugs and drug targets for both prophylaxis and chemotherapy. The aim of the study was to discover effective plant extracts against Plasmodium falciparum. In the present study, the hexane, chloroform, ethyl acetate, acetone, and methanol extracts of Citrus sinensis (peel), Leucas aspera, Ocimum sanctum, Phyllanthus acidus (leaf), Terminalia chebula (seed) were tested for their antimalarial activity against chloroquine (CQ)-sensitive (3D7) strain of P. falciparum which was cultured following the candle-jar method. Antimalarial evaluations of daily replacement of culture medium containing CQ and different plant crude extracts were performed on 96-well plates at 37°C for 24 and 48 h. Parasitemia was determined microscopically on thin-film Giemsa-stained preparations. Plant extracts were tested for their cytotoxicity using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay on human laryngeal cancer cell line (HEp-2) and normal cell line (Vero). Out of the 25 extracts tested, six showed good (IC50 4.76–22.76 μg/mL), 15 exhibited moderate (IC50 31.42–88.03 μg/mL), while four displayed mild (IC50 > 100 μg/mL) antiplasmodial activity. The leaf ethyl acetate and methanol extracts of L. aspera; ethyl acetate, acetone, and methanol extracts of P. acidus; and seed acetone extract of T. chebula had good antiplasmodial activity (IC50 = 7.81, 22.76, 9.37, 14.65, 12.68, and 4.76 μg/mL) with selectivity indices 5.43, 2.04, 4.88, 3.35, 3.42, and 9.97 for HEp-2 and >5.79, >2.20, >11.75, >3.41, >3.94, and >7.38 for Vero cells, respectively. These analyses have revealed for the first time that the components present in the solvent extracts of L. aspera, P. acidus, and T. chebula have antiplasmodial activity. The high antiplasmodial activity observed make these plants good candidates for isolation of anti-protozoal compounds which could serve as new lead structures for drug development.

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Acknowledgements

The authors are grateful to C. Abdul Hakeem of the College Management; Dr. S. Mohammed Yousuff, Principal; and Dr. K. Abdul Subhan, HOD of Zoology Department for providing the facilities to carry out this work. We are grateful to the Malaria Research Laboratory, International Centre for Genetic Engineering and Biotechnology, New Delhi, India, for providing P. falciparum. This investigation received financial support from the University Grants Commission (F.No.35-71/2008 SR), Government of India, New Delhi.

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  1. Unit of Nanotechnology and Bioactive Natural Products, Post Graduate and Research Department of Zoology, C. Abdul Hakeem College, Melvisharam - 632 509, Vellore District, Tamil Nadu, India

    Asokan Bagavan, Abdul Abdul Rahuman & Chinnaperumal Kamaraj

  2. Malaria Research Laboratory, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi, 110067, India

    Naveen Kumar Kaushik, Dinesh Mohanakrishnan & Dinkar Sahal

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  1. Asokan Bagavan
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  3. Chinnaperumal Kamaraj
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Correspondence to Abdul Abdul Rahuman.

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Bagavan, A., Rahuman, A.A., Kamaraj, C. et al. Antiplasmodial activity of botanical extracts against Plasmodium falciparum . Parasitol Res 108, 1099–1109 (2011). https://doi.org/10.1007/s00436-010-2151-0

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