管道中全氟辛酸的积累和释放促进了饮用水中带有不同抗生素耐药基因的细菌群落和机会性病原体的生长。

Journal of hazardous materials Pub Date : 2024-10-05 Epub Date: 2024-08-22 DOI:10.1016/j.jhazmat.2024.135600
Haibo Wang, Xiangkai Tao, Hong Yin, Xueci Xing, Baoyou Shi
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引用次数: 0

摘要

机会性病原体(OPs)和抗生素耐药基因(ARGs)通过饮用水的传播已经造成了严重的人类健康问题。了解全氟辛酸(PFOA)对饮用水中含有不同 ARGs 的 OPs 的影响也迫在眉睫。我们的研究结果表明,全氟辛酸在管道中的积累和释放导致其在管道流出物中的浓度在积累 6 个月后从 0.03 ± 0.01 μg/L 增加到 0.70 ± 0.01 μg/L。PFOA 还促进了 Hyphomicrobium、Microbacterium 和 Bradyrhizobium 的生长。此外,管道中 PFOA 的积累和释放促进了新陈代谢和三羧酸(TCA)循环过程,从而产生了更多的胞外聚合物质(EPS)。由于 EPS 的保护,铜绿假单胞菌和嗜肺军团菌的基因拷贝数分别增加到 (7.20 ± 0.09) × 104 个/毫升和 (8.85 ± 0.11) × 102 个/毫升。此外,PFOA 还增强了不同 ARGs 的转移潜力,包括 emrB、mdtB、mdtC、mexF 和 macB。主要细菌群落组成和主要 OPs 与主要 ARGs 和移动遗传因子(MGE)-ARGs 显著正相关。因此,PFOA 促进了具有不同 ARGs 的 OPs 的繁殖。这些结果对于控制饮用水中带有 ARGs 和 MGE-ARGs 的 OPs 所引起的微生物风险具有重要意义。
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The perfluorooctanoic acid accumulation and release from pipelines promoted growth of bacterial communities and opportunistic pathogens with different antibiotic resistance genes in drinking water.

The spread of opportunistic pathogens (OPs) and antibiotic resistance genes (ARGs) through drinking water has already caused serious human health issues. There is also an urgent need to know the effects of perfluorooctanoic acid (PFOA) on OPs with different ARGs in drinking water. Our results suggested that PFOA accumulation and release from the pipelines induced its concentration in pipelines effluents increase from 0.03 ± 0.01 μg/L to 0.70 ± 0.01 μg/L after 6 months accumulation. The PFOA also promoted the growth of Hyphomicrobium, Microbacterium, and Bradyrhizobium. In addition, PFOA accumulation and release from the pipelines enhanced the metabolism and tricarboxylic acid (TCA) cycle processes, resulting in more extracellular polymeric substances (EPS) production. Due to EPS protection, Pseudomonas aeruginosa and Legionella pneumophila increased to (7.20 ± 0.09) × 104 gene copies/mL, and (8.85 ± 0.11) × 102 gene copies/mL, respectively. Moreover, PFOA also enhanced the transfer potential of different ARGs, including emrB, mdtB, mdtC, mexF, and macB. The main bacterial community composition and the main OPs positively correlated with the main ARGs and mobile genetic elements (MGE)-ARGs significantly. Therefore, PFOA promoted the propagation of OPs with different ARGs. These results are meaningful for controlling the microbial risk caused by the OPs with ARGs and MGE-ARGs in drinking water.

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