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首页> 外文期刊>International Journal of Environmental Research and Public Health >Biomethylation and Volatilization of Arsenic by Model Protozoan Tetrahymena pyriformis under Different Phosphate Regimes
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Biomethylation and Volatilization of Arsenic by Model Protozoan Tetrahymena pyriformis under Different Phosphate Regimes

机译：不同磷酸盐体制下模型原生动物四膜虫虫对砷的生物甲基化和挥发作用

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摘要

Tetrahymena pyriformis , a freshwater protozoan, is common in aquatic systems. Arsenic detoxification through biotransformation by T. pyriformis is important but poorly understood. Arsenic metabolic pathways (including cellular accumulation, effluxion, biomethylation, and volatilization) of T. pyriformis were investigated at various phosphate concentrations. The total intracellular As concentration increased markedly as the external phosphate concentration decreased. The highest concentration was 168.8 mg·kg ?1 dry weight, after exposure to As(V) for 20 h. Inorganic As was dominant at low phosphate concentrations (3, 6, and 15 mg·L ?1 ), but the concentration was much lower at 30 mg·L ?1 phosphate, and As(V) contributed only ~7% of total cellular As. Methylated As contributed 84% of total As at 30 mg·L ?1 phosphate, and dimethylarsenate (DMAs(V)) was dominant, contributing up to 48% of total As. Cellular As effluxion was detected, including inorganic As(III), methylarsenate (MAs(V)) and DMAs(V). Volatile As was determined at various phosphate concentrations in the medium. All methylated As concentrations (intracellular, extracellular, and volatilized) had significant linear positive relationships with the initial phosphate concentration. To the best of our knowledge, this is the first study of As biotransformation by protozoa at different phosphate concentrations.
机译：梨形四膜虫（Tetrahymena pyriformis）是一种淡水原生动物，在水生系统中很常见。通过梨形衣原体的生物转化进行的砷解毒很重要，但知之甚少。在不同的磷酸盐浓度下研究了吡虫的砷代谢途径（包括细胞积累，外排，生物甲基化和挥发）。随着外部磷酸盐浓度的降低，细胞内总砷浓度显着增加。暴露于As（V）20 h后，最高浓度为干重168.8 mg·kg？1。无机砷在低磷酸盐浓度（3、6和15 mg·L？1）下占主导地位，但在30 mg·L？1磷酸盐下浓度却低得多，而As（V）仅占细胞总数的7％左右。如。在30 mg·L？1磷酸盐中，甲基化砷占总砷的84％，砷酸二甲酯（DMAs（V））占主导地位，占总砷的48％。检测到细胞As流出，包括无机As（III），砷酸甲酯（MAs（V））和DMAs（V）。在培养基中各种磷酸盐浓度下测定挥发性As。所有甲基化砷浓度（细胞内，细胞外和挥发的）与初始磷酸盐浓度具有显着的线性正相关。据我们所知，这是首次在不同磷酸盐浓度下通过原生动物进行砷生物转化的研究。

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