Journal
CHEMOSPHERE
Volume 196, Issue -, Pages 251-259Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.12.176
Keywords
Bio-electrochemical reactors; Klebsiella spp.; Antibiotic resistance gene; Electrolytic stimulation; Resistance gene expression
Categories
Funding
- National Natural Science Foundation of China [41571476]
- Provincial Key Technologies R&D Program of Jiangsu, China [BE2015358]
- National Science and Technology Major Project of China [2017ZX07202004]
- Fundamental Research Funds for the Central Universities [2242017K41048]
- Nanjing Normal University
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The fate of antibiotic-resistant bacteria (ARB) and associated antibiotic-resistant gene (ARG) expression under electrolytic stimulation in bio-electrochemical reactors (BERs) was unknown. In this study, sulfadiazine resistant bacteria (Klebsiella spp.), which were isolated from a BER, were subjected to constant direct current (DC) stimulation in a simulated BER. With an increase of the current from 7 to 28 mA, it was found that lactic dehydrogenase (LDH) showed a 1.03-, 1.21-, 1.34-, and 1.46-fold value compared with the control at 48 h, indicating that the cell membrane permeability had increased. Since the adenosine triphosphate (ATP) concentration increased with the current, the specific growth rate of Klebsiella spp. increased (R = 0.98). The viable count of Klebsiella spp. reached a maximum at 19 mA and then decreased. The percentage of ARB lethality, which was reflected by flow cytometry analysis, increased from 18% (7 mA) to 37.8% (28 mA) at 48 h. Reactive oxygen species (ROS) produced from the electrolysis of water were greater with the increasing current (R = 0.94), which may be responsible for the high lethality rate of Klebsiella spp.. Scanning electronic microscope results showed that electrolytic stimulation changed the cell surface morphology with some cell disruption. An upregulation of sulII and Int1 expression was observed. A significant correlation between Int1 and the current (R = 0.97) were observed. Taken together, BERs possess potential risks in accelerating ARB multiplication and promoting ARG expression. (C) 2017 Elsevier Ltd. All rights reserved.
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