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Drug-regulated expression of Plasmodium falciparum P-glycoprotein hornologue 1: a putative role for nuclear receptors

Johnson, David, Owen, A., Plant, N., Bray, Patrick and Ward, Steve ORCID: (2008) 'Drug-regulated expression of Plasmodium falciparum P-glycoprotein hornologue 1: a putative role for nuclear receptors'. Antimicrobial Agents and Chemotherapy, Vol 52, Issue 4, pp. 1438-1445.

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Acquired resistance to therapeutic agents is a major clinical concern in the prevention/treatment of malaria. The parasite has developed resistance to specific drugs through two mechanisms: mutations in target proteins such as dihydrofolate reductase and the bc1 complex for antifolates and nathoquinones, respectively, and alterations in predicted parasite transporter molecules such as P-glycoprotein homologue 1 (Pgh1) and Plasmodium falciparum CRT (PfCRT). Alterations in the expression of Pgh1 have been associated with modified susceptibility to a range of unrelated drugs. The molecular mechanism(s) that is responsible for this phenotype is unknown. We have shown previously (A. M. Ndifor, R. E. Howells, P. G. Bray, J.L. Ngu, and S. A. Ward, Antimicrob. Agents Chemother. 37:1318-1323, 2003) that the anticonvulsant phenobarbitone (PB) can induce reduced susceptibility to chloroquine (CQ) in P. falciparum, and in the current study, we provide the first evidence for a molecular mechanism underlying this phenomenon. We demonstrate that pretreatment with PB can elicit decreased susceptibility to CQ in both CQ-resistant and CQ-sensitive parasite lines and that this is associated with the increased expression of the drug transporter Pgh1 but not PfCRT. Furthermore, we have investigated the proximal promoter regions from both pfmdr1 and pfcrt and identified a number of putative binding sites for nuclear receptors with sequence similarities to regions known to be activated by PB in mammals. Whole-genome analysis has revealed a putative nuclear receptor gene, providing the first evidence that nuclear receptor-mediated responses to drug exposure may be a mechanism of gene regulation in P. falciparum.

Item Type: Article
Subjects: WA Public Health > Preventive Medicine > WA 110 Prevention and control of communicable diseases. Transmission of infectious diseases
WA Public Health > Preventive Medicine > WA 240 Disinfection. Disinfestation. Pesticides (including diseases caused by)
WC Communicable Diseases > Tropical and Parasitic Diseases > WC 765 Prevention and control
WC Communicable Diseases > Tropical and Parasitic Diseases > WC 750 Malaria
QX Parasitology > Protozoa > QX 135 Plasmodia
Faculty: Department: Groups (2002 - 2012) > Molecular & Biochemical Parasitology Group
Digital Object Identifer (DOI):
Depositing User: Mary Creegan
Date Deposited: 07 Jul 2010 15:03
Last Modified: 17 Jul 2020 10:57


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