Journal
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
Volume 19, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/ijerph19159405
Keywords
nanoscale zero-valent iron (nZVI); zinc oxide nanoparticles (nZnO); tetracycline resistance genes (tet-ARGs); class 1 integron (intI1); tetracycline
Funding
- Department of Science and Technology of Sichuan Province, China [2019YFH0068, 2020YFH0163]
- Key Laboratory of Agricultural Environment in Southwest Mountain Areas, Ministry of Agriculture, and Rural Affairs, China [AESMA-OPP-2019007]
- Power Construction Corporation of China [DJ-ZDXM-2019-42]
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This study found that nanoparticles nZVI and nZnO can promote the abundance of tetracycline resistance genes in sediment, but nZVI and bacterial communities can also reduce tetracycline resistance gene abundance when tetracycline is present. The findings are important for understanding the role of nanoparticles in promoting and reducing antibiotic resistance genes in the environment.
Nanoparticles (NPs) are widely used and ubiquitous in the environment, but the consequences of their release into the environment on antibiotics resistance genes (ARGs), microbial abundance, and community, are largely unknown. Therefore, this study examined the effect of nano zero-valent iron (nZVI) and zinc oxide (nZnO) on tetracycline resistance genes (tet-ARGs) and class 1 integron (intI1) in sediment under laboratory incubation. The coexistence of NPs and tetracycline (TC) on tet-ARGs/intI1 was also investigated. It was found that nZVI and nZnO promoted tet-ARGs/intI1 abundance in sediment without TC but reduced the inducing effect of TC on tet-ARGs/intI1 in sediment overlaid with TC solution. Without TC, nZVI, intI1, and the bacterial community could directly promote tet-ARGs spread in nZVI sediment, while intI1 and bacterial abundance were the most directly important reasons for tet-ARGs spread in nZnO sediment. With TC, nZVI and bacterial community could reduce tet-ARGs abundance in nZVI sediment, while nZnO and bacterial community could directly promote tet-ARGs in nZnO sediment. Finally, these findings provided valuable information for understanding the role of NPs in promoting and reducing ARGs in the environment.
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