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- W2149544217 abstract "Drug-resistant Plasmodium falciparum malaria is a major public health problem. An elevated pfmdr1 gene copy number (CN) is known to decrease parasite sensitivity to the commonly used antimalarial mefloquine (MFQ). To understand the relationship between pfmdr1 CN and mefloquine resistance, we evaluated pfmdr1 transcript levels in three P. falciparum strains with different CNs in the presence and absence of MFQ. Parasite strains with multiple pfmdr1 gene copies exhibited higher relative transcript levels than single-copy parasites, and MFQ induced pfmdr1 expression above the levels without treatment in all three strains evaluated. Concomitant morphology analyses of the sampled cultures revealed that MFQ treatment of synchronized ring-stage parasites induced a delay in parasite maturation through the intraerythrocytic cycle. pfmdr1 expression peaks in the ring stage, and MFQ could be causing increased transcription by delaying parasite maturation. However, pretreatment with mefloquine did not affect the artemisinin in vitro half-maximal inhibitory concentration (IC(50)). These results suggest that MFQ-induced increases in pfmdr1 expression are the direct result of the maturation delay at the ring stage but that this change in expression does not affect the antimalarial activity of artemisinin." @default.
- W2149544217 created "2016-06-24" @default.
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- W2149544217 date "2012-12-03" @default.
- W2149544217 modified "2023-09-27" @default.
- W2149544217 title "Mefloquine Exposure Induces Cell Cycle Delay and Reveals Stage-Specific Expression of the pfmdr1 Gene" @default.
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- W2149544217 doi "https://doi.org/10.1128/aac.01006-12" @default.
- W2149544217 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3553685" @default.
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