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Adverse physiological and molecular level effects of polystyrene microplastics on freshwater microalgae.
Chemosphere. 2020 Sep; 255:126914.C

Abstract

Microplastics have aroused widespread concern because of their adverse effects on aquatic organisms. However, the underlying toxicity mechanisms have not been examined in detail. This study investigated the interactions between polystyrene microplastics (PS-MPs) and the model freshwater microalgae Euglena gracilis. The results of transmission electron microscopy showed that the vacuoles of microalgae were induced after 24 h exposure to 1 mg/L PS-MPs (5 μm and 0.1 μm). Furthermore, PS-MPs significantly (p < 0.05) reduced pigment contents. Moreover, superoxide dismutase activities were significantly (p < 0.05) induced in all PS-MPs treated groups. Peroxidase activities were also significantly (p < 0.05) affected by two sizes of PS-MPs (5 μm and 0.1 μm), indicating that oxidative stress was induced after exposure to PS-MPs. At the molecular level, PS-MPs dysregulated the expression of genes involved in cellular processes, genetic information processing, organismal systems, and metabolisms. The KCS gene and the CTR1 gene may be key pathways to induce adverse effects on the E. gracilis after exposure to 5 μm PS-MPs. These findings will help to elucidate the underlying molecular mechanism of microplastics toxicity on freshwater organisms.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Xiao Y
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
Jiang X
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
Liao Y
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
Zhao W
Department of Environmental Engineering, School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.
Zhao P
Department of Environmental Engineering, School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.
Li M
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China. Electronic address: meili@nju.edu.cn.

MeSH

Aquatic OrganismsFresh WaterMicroalgaeMicroplasticsOxidative StressPlasticsPolystyrenesWater Pollutants, Chemical

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32387728

Citation

Xiao, Yao, et al. "Adverse Physiological and Molecular Level Effects of Polystyrene Microplastics On Freshwater Microalgae." Chemosphere, vol. 255, 2020, p. 126914.
Xiao Y, Jiang X, Liao Y, et al. Adverse physiological and molecular level effects of polystyrene microplastics on freshwater microalgae. Chemosphere. 2020;255:126914.
Xiao, Y., Jiang, X., Liao, Y., Zhao, W., Zhao, P., & Li, M. (2020). Adverse physiological and molecular level effects of polystyrene microplastics on freshwater microalgae. Chemosphere, 255, 126914. https://doi.org/10.1016/j.chemosphere.2020.126914
Xiao Y, et al. Adverse Physiological and Molecular Level Effects of Polystyrene Microplastics On Freshwater Microalgae. Chemosphere. 2020;255:126914. PubMed PMID: 32387728.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Adverse physiological and molecular level effects of polystyrene microplastics on freshwater microalgae. AU - Xiao,Yao, AU - Jiang,Xiaofeng, AU - Liao,Yuanchen, AU - Zhao,Weigao, AU - Zhao,Peng, AU - Li,Mei, Y1 - 2020/05/01/ PY - 2020/02/11/received PY - 2020/04/12/revised PY - 2020/04/26/accepted PY - 2020/5/11/pubmed PY - 2020/7/3/medline PY - 2020/5/11/entrez KW - Euglena gracilis KW - Freshwater microalgae KW - Gene expression analysis KW - Oxidative stress KW - Polystyrene microplastics SP - 126914 EP - 126914 JF - Chemosphere JO - Chemosphere VL - 255 N2 - Microplastics have aroused widespread concern because of their adverse effects on aquatic organisms. However, the underlying toxicity mechanisms have not been examined in detail. This study investigated the interactions between polystyrene microplastics (PS-MPs) and the model freshwater microalgae Euglena gracilis. The results of transmission electron microscopy showed that the vacuoles of microalgae were induced after 24 h exposure to 1 mg/L PS-MPs (5 μm and 0.1 μm). Furthermore, PS-MPs significantly (p < 0.05) reduced pigment contents. Moreover, superoxide dismutase activities were significantly (p < 0.05) induced in all PS-MPs treated groups. Peroxidase activities were also significantly (p < 0.05) affected by two sizes of PS-MPs (5 μm and 0.1 μm), indicating that oxidative stress was induced after exposure to PS-MPs. At the molecular level, PS-MPs dysregulated the expression of genes involved in cellular processes, genetic information processing, organismal systems, and metabolisms. The KCS gene and the CTR1 gene may be key pathways to induce adverse effects on the E. gracilis after exposure to 5 μm PS-MPs. These findings will help to elucidate the underlying molecular mechanism of microplastics toxicity on freshwater organisms. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/32387728/Adverse_physiological_and_molecular_level_effects_of_polystyrene_microplastics_on_freshwater_microalgae_ DB - PRIME DP - Unbound Medicine ER -