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Nanoplastics Promote Microcystin Synthesis and Release from Cyanobacterial . | LitMetric

Nanoplastics Promote Microcystin Synthesis and Release from Cyanobacterial .

Environ Sci Technol

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, P. R. China.

Published: March 2020

AI Article Synopsis

Article Abstract

Although the fate of nanoplastics (<100 nm) in freshwater systems is increasingly well studied, much less is known about its potential threats to cyanobacterial blooms, the ultimate phenomenon of eutrophication occurrence worldwide. Previous studies have evaluated the consequences of nanoplastics increasing the membrane permeability of microbes, however, there is no direct evidence for interactions between nanoplastics and microcystin; intracellular hepatotoxins are produced by some genera of cyanobacteria. Here, we show that the amino-modified polystyrene nanoplastics (PS-NH) promote microcystin synthesis and release from , a dominant species causing cyanobacterial blooms, even without the change of coloration. We demonstrate that PS-NH inhibits photosystem II efficiency, reduces organic substance synthesis, and induces oxidative stress, enhancing the synthesis of microcystin. Furthermore, PS-NH promotes the extracellular release of microcystin from via transporter protein upregulation and impaired cell membrane integrity. Our findings propose that the presence of nanoplastics in freshwater ecosystems might enhance the threat of eutrophication to aquatic ecology and human health.

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Source
http://dx.doi.org/10.1021/acs.est.9b06085DOI Listing

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