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首页> 外文期刊>The FASEB Journal >Ornithine uptake and the modulation of drug sensitivity in Trypanosoma brucei
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Ornithine uptake and the modulation of drug sensitivity in Trypanosoma brucei

机译:鸟氨酸摄取和<斜斜肌瘤Brucei

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Trypanosoma brucei , protozoan parasites that cause human African trypanosomiasis (HAT), depend on ornithine uptake and metabolism by ornithine decarboxylase (ODC) for survival. Indeed, ODC is the target of the WHO “essential medicine” eflornithine, which is antagonistic to another anti-HAT drug, suramin. Thus, ornithine uptake has important consequences in T. brucei , but the transporters have not been identified. We describe these amino acid transporters (AATs). In a heterologous expression system, TbAAT10-1 is selective for ornithine, whereas TbAAT2-4 transports both ornithine and histidine. These AATs are also necessary to maintain intracellular ornithine and polyamine levels in T. brucei , thereby decreasing sensitivity to eflornithine and increasing sensitivity to suramin. Consistent with competition for histidine, high extracellular concentrations of this amino acid phenocopied a TbAAT2-4 genetic defect. Our findings established TbAAT10-1 and TbAAT2-4 as the parasite ornithine transporters, one of which can be modulated by histidine, but both of which affect sensitivity to important anti-HAT drugs.—Macedo, J. P., Currier, R. B., Wirdnam, C., Horn, D., Alsford, S., Rentsch, D. Ornithine uptake and the modulation of drug sensitivity in Trypanosoma brucei .
机译:导致人类非洲锥虫病(帽子)的原生动物寄生虫,冠状癌(帽子),取决于鸟氨酸脱羧酶(ODC)的鸟氨酸摄取和新陈代谢用于存活。实际上,ODC是世界卫生组织“基本药”EFLORNINE的目标,这对另一个抗帽子药物苏拉司氏菌具有拮抗作用。因此,Ornithine摄取在T.Brucei中具有重要的影响,但尚未确定运输扣。我们描述了这些氨基酸转运蛋白(AATS)。在异源表达系统中,TBAAT10-1是用于鸟氨酸的选择性,而TBAAT2-4则转运鸟氨酸和组氨酸。这些AAT也必须保持细胞内的鸟氨酸和多胺水平在T.Brucei中,从而降低对eFlornithine的敏感性,并增加对苏拉司的敏感性。与组氨酸的竞争一致,这种氨基酸的高细胞外浓度是TBAAT2-4遗传缺陷。我们的发现建立了TBAAT10-1和TBAAT2-4作为寄生虫鸟氨酸转运蛋白,其中一个可以通过组氨酸调节,但这两者都影响到重要的抗帽子药物的敏感性.-麦克风,JP,CURRIER,RB,Wirdnam,C 。,喇叭,D.,Alsford,S.,rentsch,D.鸟氨酸摄取和调节锥虫瘤Brucei中的药物敏感性。

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