Abstract
The evolving clinical resistance in Plasmodium falciparum and the spike in malarial cases after the COVID-19 outbreak has triggered a search for new antimalarials effective against multi-drug-resistant P. falciparum strains. In this study, we assessed the timing of action, either fast or slow-acting of 13 potent compounds of Pandemic Response Box (PRB) against blood-stage Pf3D7 strain by SYBR Green-I assay. The asynchronous culture of Pf3D7 was exposed to varying concentrations of 13 compounds, and IC50 values were determined at 12, 24, 48, 72, and 96 h. We identified four fast-acting compounds (MMV000008, MMV1593541, MMV020752, MMV396785) with rapid-growth inhibitory activity having IC50 values ≤ 0.3 µM at 12 and 24 h. Similarly, we determined nine slow-acting compounds (MMV159340, MMV1634492, MMV1581558, MMV689758, MMV1593540, MMV394033, MMV019724, MMV000725, MMV1557856) having IC50 values ≤ 0.5 µM at 72 and 96 h. Furthermore, the stage-specific action of the two most potent fast-acting compounds (MMV1593541 and MMV020752) against rings, trophozoites, and schizonts at 48 h of exposure revealed that ring-stage parasites showed reduced IC50 values compared to mature stage forms. Therefore, our study demonstrates for the first time the identification of the most potent fast and slow-acting compounds from PRB against blood-stage infection, suggesting its utility in clinics and considering it as a partner drug in combination therapies.
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Acknowledgements
The V.R. lab is supported by the research grant from Department of Science & Technology (DST), INSPIRE-Faculty Project (DST/INSPIRE/04/2018/003541), Ministry of Science and Technology, Government of India. We thank Pondicherry Institute of Medical Sciences (PIMS) Blood Bank, Puducherry, India, for a continuous blood supply for parasite culture. We gratefully thank the Medicine for Malaria Ventures (MMV, www.mmv.org) for their support and supply of the PRB box.
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This word was funded by Mission on Department of Science & Technology (DST), DST/INSPIRE/04/2018/003541.
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VR and NCN: contributed equally toward the literature survey, data interpretation, and preparation of the tables. VR: contributed to the overall supervision, critical analysis of the intellectual content, revision of the manuscript, and funding acquisition. All authors read and approved the final version of the manuscript.
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Rajendran, V., Naveen, N.C. Identifying Fast and Slow-Acting Antimalarial Compounds of Pandemic Response Box Against Blood-Stage Culture of Plasmodium falciparum 3D7. Curr Microbiol 81, 81 (2024). https://doi.org/10.1007/s00284-023-03601-9
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DOI: https://doi.org/10.1007/s00284-023-03601-9