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• W2140202225 endingPage "1993" @default.
• W2140202225 startingPage "1988" @default.
• W2140202225 abstract "Antimonial compounds are the mainstay for the treatment of infections with the protozoan parasite Leishmania. We present our studies on Leishmania infantum amastigote parasites selected for resistance to potassium antimonyl tartrate [Sb(III)]. Inside macrophages, the Sb(III)-selected cells are cross-resistant to sodium stibogluconate (Pentostam), the main drug used against Leishmania. Putative alterations in the level of expression of more than 40 genes were compared between susceptible and resistant axenic amastigotes using customized DNA microarrays. The expression of three genes coding for the ABC transporter MRPA (PGPA), S-adenosylhomocysteine hydrolase, and folylpolyglutamate synthase was found to be consistently increased. The levels of cysteine were found to be increased in the mutant. Transfection of the MRPA gene was shown to confer sodium stibogluconate resistance in intracellular parasites. This MRPA-mediated resistance could be reverted by using the glutathione biosynthesis-specific inhibitor buthionine sulfoximine. These results highlight for the first time the role of MRPA in antimony resistance in the amastigote stage of the parasite and suggest a strategy for reversing resistance." @default.
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• W2140202225 date "2005-05-01" @default.
• W2140202225 modified "2023-09-30" @default.
• W2140202225 title "Role of the ABC Transporter MRPA (PGPA) in Antimony Resistance in <i>Leishmania infantum</i> Axenic and Intracellular Amastigotes" @default.
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• W2140202225 doi "https://doi.org/10.1128/aac.49.5.1988-1993.2005" @default.
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