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• W2076207639 abstract "Phenanthridine trypanocides (isometamidium chloride hydrochloride, ISM, and Ethidium bromide, EBr) have been widely used to treat African trypanosomiasis in livestock for more than 40 years. Their main action is to inhibit nucleic acid synthesis in trypanosome parasites, by intercalation between the DNA base pairs. They can also linearise selectively kinetoplast DNA minicircles; a form of mitochondrial DNA unique to this group of parasites. However, the metabolism of these compounds by trypanosomes has not been reported. Indeed, it is not known whether or not their metabolism by the parasite contributes to their activity, selective toxicity for these parasites or to the development of chemoresistance. Therefore, we studied the metabolism of EBr and ISM, and their distribution in Trypanosoma brucei (TREU 927) using high performance liquid chromatography (HPLC), liquid chromatography combined with mass spectrometry (LC-MS) and confocal laser scanning microscopy (CLSM). Incubation of EBr with trypanosomes led to the formation of a small amount (0.606+/-0.191%) of one metabolite (MI). Ion chromatograms extracted from an LC-MS analysis using electrospray ionisation (ESI), showed that the difference in mass between the parent compound and its metabolite was 30. This may correspond to the addition of a hydroxyl and a methyl group. No metabolites could be detected for ISM. The distribution of the two drugs in trypanosomes was investigated by CLSM, using their intrinsic fluorescence. ISM and EBr showed differences in their distribution in trypanosomes. ISM had a greater affinity for the kinetoplast than EBr and it stained other organelles like the flagellum; in contrast the distribution of EBr was more diffuse." @default.
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• W2076207639 date "2002-12-01" @default.
• W2076207639 modified "2023-10-17" @default.
• W2076207639 title "Metabolism and distribution of phenanthridine trypanocides in Trypanosoma brucei" @default.
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• W2076207639 doi "https://doi.org/10.1016/s0001-706x(02)00188-2" @default.
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