BACKGROUND: @entity32504 (PN) and @entity503 (CQ) are structurally related anti-malarial drugs with primarily the same mode of action. However, PN is effective against several multidrug-resistant lines of @entity3964 , including CQ resistant lines, suggestive of important operational differences between the two drugs. METHODS: Synchronized trophozoite stage cultures of @entity3964 K1 (CQ resistant) were exposed to 50% inhibitory concentrations (IC50) of PN and CQ, and parasites were harvested from culture after 4 and 24 hours exposure. Global transcriptional changes effected by drug treatment were investigated using DNA microarrays. RESULTS: After a 4 h drug exposure, PN induced a greater degree of transcriptional perturbation (61 differentially expressed features) than CQ (10 features). More genes were found to respond to 24 h treatments with both drugs, and 461 features were found to be significantly responsive to one or both drugs across all treatment conditions. Filtering was employed to remove features unrelated to primary @entity734 , specifically features representing genes developmentally regulated, secondary stress/death related processes and sexual stage development. The only significant gene ontologies represented among the 46 remaining features after filtering relate to host exported proteins from multi-gene families. CONCLUSIONS: The @entity311 parasite's molecular responses to PN and CQ treatment are similar in terms of the genes and pathways affected. However, PN appears to exert a more rapid response than CQ. The faster action of PN may explain why PN is more efficacious than CQ, particularly against CQ resistant isolates. In agreement with several other microarray studies of @entity734 on the parasite, it is not possible, however, to discern mechanism of @entity734 from the drug-responsive genes.

Global gene expression profiling of XXXX in response to the anti-malarial drug @entity32504 .

@entity32504 :: ('MESH:C027871', 'Chemical') :: ['Pyronaridine'] @entity3964 :: ('5833', 'Species') :: ['P. falciparum strain', 'Plasmodium falciparum'] @entity311 :: ('MESH:D008288', 'Disease') :: ['malaria'] @entity503 :: ('MESH:D002738', 'Chemical') :: ['chloroquine'] @entity734 :: ('MESH:D019966', 'Disease') :: ['drug action']
@entity3964 :: (5833,Species) :: ['Plasmodium falciparum']
