Use of a selective inhibitor to define the chemotherapeutic potential of the plasmodial hexose transporter in different stages of the parasite's life cycle.
Antimicrob Agents Chemother
; 55(6): 2824-30, 2011 Jun.
Article
en En
| MEDLINE
| ID: mdl-21402842
ABSTRACT
During blood infection, malarial parasites use D-glucose as their main energy source. The Plasmodium falciparum hexose transporter (PfHT), which mediates the uptake of D-glucose into parasites, is essential for survival of asexual blood-stage parasites. Recently, genetic studies in the rodent malaria model, Plasmodium berghei, found that the orthologous hexose transporter (PbHT) is expressed throughout the parasite's development within the mosquito vector, in addition to being essential during intraerythrocytic development. Here, using a D-glucose-derived specific inhibitor of plasmodial hexose transporters, compound 3361, we have investigated the importance of D-glucose uptake during liver and transmission stages of P. berghei. Initially, we confirmed the expression of PbHT during liver stage development, using a green fluorescent protein (GFP) tagging strategy. Compound 3361 inhibited liver-stage parasite development, with a 50% inhibitory concentration (IC50) of 11 µM. This process was insensitive to the external D-glucose concentration. In addition, compound 3361 inhibited ookinete development and microgametogenesis, with IC50s in the region of 250 µM (the latter in a D-glucose-sensitive manner). Consistent with our findings for the effect of compound 3361 on vector parasite stages, 1 mM compound 3361 demonstrated transmission blocking activity. These data indicate that novel chemotherapeutic interventions that target PfHT may be active against liver and, to a lesser extent, transmission stages, in addition to blood stages.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Plasmodium berghei
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Proteínas de Transporte de Monosacáridos
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Antimaláricos
Tipo de estudio:
Prognostic_studies
Límite:
Animals
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Humans
Idioma:
En
Año:
2011
Tipo del documento:
Article