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Detection and Quantification of Viable and Nonviable Trypanosoma cruzi Parasites by a Propidium Monoazide Real-Time Polymerase Chain Reaction Assay.

机译:通过单叠氮化物实时聚合酶链反应测定法检测和定量活的和不活的克氏锥虫。

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摘要

Molecular techniques based on real-time polymerase chain reaction (qPCR) allow the detection and quantification of DNA but are unable to distinguish between signals from dead or live cells. Because of the lack of simple techniques to differentiate between viable and nonviable cells, the aim of this study was to optimize and evaluate a straightforward test based on propidium monoazide (PMA) dye action combined with a qPCR assay (PMA-qPCR) for the selective quantification of viable/nonviable epimastigotes of Trypanosoma cruzi PMA has the ability to penetrate the plasma membrane of dead cells and covalently cross-link to the DNA during exposure to bright visible light, thereby inhibiting PCR amplification. Different concentrations of PMA (50-200 μM) and epimastigotes of the Maracay strain of T. cruzi (1 × 105-10 parasites/mL) were assayed; viable and nonviable parasites were tested and quantified by qPCR with a TaqMan probe specific for T. cruzi In the PMA-qPCR assay optimized at 100 μM PMA, a significant qPCR signal reduction was observed in the nonviable versus viable epimastigotes treated with PMA, with a mean signal reduction of 2.5 logarithm units and a percentage of signal reduction > 98%, in all concentrations of parasites assayed. This signal reduction was also observed when PMA-qPCR was applied to a mixture of live/dead parasites, which allowed the detection of live cells, except when the concentration of live parasites was low (10 parasites/mL). The PMA-qPCR developed allows differentiation between viable and nonviable epimastigotes of T. cruzi and could thus be a potential method of parasite viability assessment and quantification.
机译:基于实时聚合酶链反应(qPCR)的分子技术可以检测和定量DNA,但无法区分来自死细胞或活细胞的信号。由于缺乏区分活细胞和非活细胞的简单技术,因此本研究的目的是优化和评估基于单叠氮化丙锭(PMA)染色作用结合qPCR测定法(PMA-qPCR)的直接测试克氏锥虫PMA的有活力/无活力副鞭毛动物的定量分析能够穿透死细胞的质膜,并在暴露于明亮可见光的过程中与DNA共价交联,从而抑制PCR扩增。测定了不同浓度的PMA(50-200μM)和克氏锥虫Maracay菌株的近鞭毛象(1×105-10寄生虫/ mL);用特异于克鲁氏酵母的TaqMan探针通过qPCR对活和不活的寄生虫进行了测试和定量。在以100μMPMA优化的PMA-qPCR分析中,观察到在用PMA处理的不活生前鞭毛和活生前鞭毛中,qPCR信号显着降低。在所有浓度的寄生虫中,平均信号减少量为2.5对数单位,信号减少百分比> 98%。当将PMA-qPCR应用于活/死寄生虫混合物时,也观察到该信号降低,这可以检测到活细胞,除非活寄生虫的浓度较低(10个寄生虫/ mL)。开发的PMA-qPCR允许区分克氏锥虫的存活和不存活的表鞭鞭毛,因此可能是寄生虫存活力评估和定量的潜在方法。

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