Martin SmilksteinNongluk SriwilaijaroenJane Xu KellyPrapon WilairatMichael RiscoeVA Medical CenterOregon Health and Science UniversityMahidol University2018-07-242018-07-242004-05-01Antimicrobial Agents and Chemotherapy. Vol.48, No.5 (2004), 1803-1806006648042-s2.0-2142640849https://repository.li.mahidol.ac.th/handle/123456789/21669Radioisotopic assays involve expense, multistep protocols, equipment, and radioactivity safety requirements which are problematic in high-throughput drug testing. This study reports an alternative, simple, robust, inexpensive, one-step fluorescence assay for use in antimalarial drug screening. Parasite growth is determined by using SYBR Green I, a dye with marked fluorescence enhancement upon contact with Plasmodium DNA. A side-by-side comparison of this fluorescence assay and a standard radioisotopic method was performed by testing known antimalarial agents against Plasmodiumfalciparum strain D6. Both assay methods were used to determine the effective concentration of drug that resulted in a 50% reduction in the observed counts (EC50) after 48 h of parasite growth in the presence of each drug. The EC50S of chloroquine, quinine, mefloquine, artemisinin, and 3,6-bis-ε -(N,N-diethylamino)-amyloxyxanthone were similar or identical by both techniques. The results obtained with this new fluorescence assay suggest that it may be an ideal method for high-throughput antimalarial drug screening.Mahidol UniversityMedicinePharmacology, Toxicology and PharmaceuticsArticleSCOPUS10.1128/AAC.48.5.1803-1806.2004