Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 26, Issue 9, Pages 9293-9304Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-019-04340-w
Keywords
CeO2 nanoparticles; Biofilm formation; Bacterial community; Oxidative stress; Quorum sensing signals
Categories
Funding
- National Natural Science Funds for Excellent Young Scholar [51722902]
- National Natural Science Funds for Creative Research Groups of China [51421006]
- National Natural Science Foundation of China [91647206]
- Outstanding Youth Fund of Natural Science Foundation of Jiangsu, China [BK20160038]
- Fundamental Research Funds for the Central Universities [2018B671X14]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX18_ 0636]
- PAPD
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In this paper, the effects of cerium oxide nanoparticles (CeO2 NPs) on the group bacterial behaviors were elaborated. After 36-h cultivation, the biofilm biomass was enhanced by the sub-lethal concentrations of 0.5 and 2 mg/L CeO2 NP exposure. Meanwhile, the promoted production of total amino acids in microbes further resulted in the increased surface hydrophobicity and percentage aggregation. To resist the CeO2 NPs stress, the biofilm exhibited a double-layer microstructure, with the protein (PRO) and living cells occupying the bottom, the polysaccharide (PS), and dead cells dominating the top. The bacterial diversity was highly suppressed and Citrobacter and Pseudomonas from the phylum of gamma-Proteobacteria strongly dominated the biofilm, indicating the selective and enriched effects of CeO2 NPs on resistant bacteria. The stimulated inherent resistance of biofilm was reflected by the reduced adenosine triphosphate (ATP) content after 4 h exposure. The increased levels of reactive oxygen species (ROS) in the treatments of 8 h CeO2 NP exposure led to the upregulated quorum sensing signals of acylated homoserine lactone (AHL) and autoinducer 2 (AI-2), beneficial to mitigating the environmental disturbance of CeO2 NPs. These results provide evidences for the accelerating effects of CeO2 NPs on biofilm formation through oxidative stress, which expand the understanding of the ecological effects of CeO2 NPs.
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