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Xu B, He J, Zou H, Zhang J, Deng L, Yang M, Liu F. Different responses of representative denitrifying bacterial strains to gatifloxacin exposure in simulated groundwater denitrification environment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 850:157929. [PMID: 35952894 DOI: 10.1016/j.scitotenv.2022.157929] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 08/03/2022] [Accepted: 08/05/2022] [Indexed: 06/15/2023]
Abstract
The impact of antibiotics on denitrification in the ecological environment has attracted widespread attention. However, the concentration threshold and inhibitory effect of the same antibiotic on denitrification mediated by mixed denitrifying microbes were conflicting in some studies. In this study, Paracoccus denitrificans, Acidovorax sp., and Pseudomonas aeruginosa were selected as representative denitrifying bacterial strains to explore the response of a single strain to gatifloxacin (GAT) exposure in groundwater denitrification. The results showed that the nitrate and nitrite removal efficiencies of Pseudomonas aeruginosa decreased by 34.87-36.25 % and 18.27-23.31 %, respectively, with exposure to 10 μg/L GAT, accompanied by a significant decline in denitrifying enzyme activity and gene expression. In contrast, the elevated denitrifying enzyme activity and gene expression of Paracoccus denitrificans promoted its nitrate and nitrite reduction by 2.09-10.00 % and 0-8.44 %, respectively. Additionally, there were no obvious effects on the removal of nitrate and nitrite by Acidovorax sp. in the presence of 10 μg/L GAT, which was consistent with the variation in denitrifying enzyme activity and total gene expression levels. The fit results of the Monod equation and its modification further elucidated the nitrate degradation characteristics from the perspective of denitrification kinetics. Furthermore, antibiotic resistance gene (ARG) analysis showed that the addition of 10 μg/L GAT (approximately 30 days) did not observably increase the relative abundance of ARGs. This study provides some preliminary understanding of the response differences of representative denitrifying bacterial strains to antibiotic exposure in groundwater denitrification.
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Affiliation(s)
- Baoshi Xu
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China; Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, PR China.
| | - Jiangtao He
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China; Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, PR China.
| | - Hua Zou
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China; Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, PR China
| | - Jingang Zhang
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China; Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, PR China
| | - Lu Deng
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China; Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, PR China
| | - Meiping Yang
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China; Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, PR China
| | - Fei Liu
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China; Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, PR China
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Wang K, Shang T, Zhang L, Zhou L, Liu C, Fu Y, Zhao Y, Li X, Wang J. Application of a Reactive Oxygen Species-Responsive Drug-Eluting Coating for Surface Modification of Vascular Stents. ACS APPLIED MATERIALS & INTERFACES 2021; 13:35431-35443. [PMID: 34304556 DOI: 10.1021/acsami.1c08880] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Stent implantation is the primary method used to treat coronary heart disease. However, it is associated with complications such as restenosis and late thrombosis. Despite surface modification being an effective way to improve the biocompatibility of stents, the current research studies are not focused on changes in the vascular microenvironment at the implantation site. In the present study, an adaptive drug-loaded coating was constructed on the surface of vascular stent materials that can respond to oxidative stress at the site of vascular lesions. Two functional molecules, epigallocatechin gallate (EGCG) and cysteine hydrochloride, were employed to fabricate a coating on the surface of 316L stainless steel. In addition, the coating was used as a drug carrier to load pitavastatin calcium. EGCG has antioxidant activity, and pitavastatin calcium can inhibit smooth muscle cell proliferation. Therefore, EGCG and pitavastatin calcium provided a synergistic anti-inflammatory effect. Moreover, the coating was cross-linked using disulfide bonds, which accelerated the release of the drug in response to reactive oxygen species. A positive correlation was observed between the rate of drug release and the degree of oxidative stress. Collectively, this drug-loaded oxidative stress-responsive coating has been demonstrated to significantly inhibit inflammation, accelerate endothelialization, and reduce the risk of restenosis of vascular stents in vivo.
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Affiliation(s)
- Kebing Wang
- Key Laboratory of Advanced Technology for Materials of Education Ministry and School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Tengda Shang
- Key Laboratory of Advanced Technology for Materials of Education Ministry and School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Lu Zhang
- Key Laboratory of Advanced Technology for Materials of Education Ministry and School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Lei Zhou
- Key Laboratory of Advanced Technology for Materials of Education Ministry and School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Changqi Liu
- Key Laboratory of Advanced Technology for Materials of Education Ministry and School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Yudie Fu
- Key Laboratory of Advanced Technology for Materials of Education Ministry and School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Yuancong Zhao
- Key Laboratory of Advanced Technology for Materials of Education Ministry and School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Xin Li
- Key Laboratory of Advanced Technology for Materials of Education Ministry and School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Jin Wang
- Key Laboratory of Advanced Technology for Materials of Education Ministry and School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
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Mahajan S, Sunsunwal S, Gautam V, Singh M, Ramya TNC. Biofilm inhibitory effect of alginate lyases on mucoid P. aeruginosa from a cystic fibrosis patient. Biochem Biophys Rep 2021; 26:101028. [PMID: 34095554 PMCID: PMC8165544 DOI: 10.1016/j.bbrep.2021.101028] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 05/03/2021] [Accepted: 05/17/2021] [Indexed: 01/21/2023] Open
Abstract
Chronic mucoid Pseudomonas aeruginosa infections are a major scourge in cystic fibrosis patients. Mucoid P. aeruginosa displays structured alginate-rich biofilms that are resistant to antibiotics. Here, we have assessed the efficacy of a panel of alginate lyases in combating mucoid P. aeruginosa biofilms in cystic fibrosis. Albeit we could not demonstrate alginate degradation by alginate lyases in sputum, we demonstrate that the endotypic alginate lyases, CaAly (from Cellulophaga algicola) and VspAlyVI (from Vibrio sp. QY101) and the exotypic alginate lyases, FspAlyFRB (from Falsirhodobacterium sp. alg1), and SA1-IV (from Sphingomonas sp. A1), indeed inhibit biofilm formation by a mucoid P. aeruginosa strain isolated from the sputum of a cystic fibrosis patient with comparative effect to that of the glycoside hydrolase PslG, a promising candidate for biofilm treatment. We believe that these enzymes should be explored for in vivo efficacy in future studies. A P. aeruginosa strain was isolated from the sputum of a cystic fibrosis patient. The anti-biofilm efficacy of endotypic and exotypic alginate lyases was assessed. Alginate lyases CaAly, VspAlyVI, FspAlyFRB, and SA1-IV inhibited biofilm formation. Similar anti-biofilm effect was observed for the glycoside hydrolase, PslG.
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Affiliation(s)
- Sonal Mahajan
- CSIR- Institute of Microbial Technology, Sector 39A, Chandigarh, 160036, India
| | - Sonali Sunsunwal
- CSIR- Institute of Microbial Technology, Sector 39A, Chandigarh, 160036, India
| | - Vikas Gautam
- Department of Medical Microbiology, Post Graduate Institute of Medical Education and Research, Sector 12, Chandigarh, 160012, India
| | - Meenu Singh
- Advanced Pediatrics Centre, Post Graduate Institute of Medical Education and Research, Sector 12, Chandigarh, 160012, India
| | - T N C Ramya
- CSIR- Institute of Microbial Technology, Sector 39A, Chandigarh, 160036, India
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