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Zhang X, Nickerson R, Burton L, Stueck A, Holbein B, Cheng Z, Zhou J, Lehmann C. The Hydroxypyridinone Iron Chelator DIBI Reduces Bacterial Load and Inflammation in Experimental Lung Infection. Biomedicines 2024; 12:1452. [PMID: 39062025 PMCID: PMC11274704 DOI: 10.3390/biomedicines12071452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Revised: 06/17/2024] [Accepted: 06/27/2024] [Indexed: 07/28/2024] Open
Abstract
Iron plays a critical role in lung infections due to its function in the inflammatory immune response but also as an important factor for bacterial growth. Iron chelation represents a potential therapeutic approach to inhibit bacterial growth and pathologically increased pro-inflammatory mediator production. The present study was designed to investigate the impact of the iron chelator DIBI in murine lung infection induced by intratracheal Pseudomonas aeruginosa (strain PA14) administration. DIBI is a polymer with a polyvinylpyrrolidone backbone containing nine 3-hydroxy-1-(methacrylamidoethyl)-2-methyl-4(1H) pyridinone (MAHMP) residues per molecule and was given by intraperitoneal injection either as a single dose (80 mg/kg) immediately after PA14 administration or a double dose (second dose 4 h after PA14 administration). The results showed that lung NF-κBp65 levels, as well as levels of various inflammatory cytokines (TNFα, IL-1β, IL-6) both in lung tissue and bronchoalveolar lavage fluid (BALF), were significantly increased 24 h after PA14 administration. Single-dose DIBI did not affect the bacterial load or inflammatory response in the lungs or BALF. However, two doses of DIBI significantly decreased bacterial load, attenuated NF-κBp65 upregulation, reduced inflammatory cytokines production, and relieved lung tissue damage. Our findings support the conclusion that the iron chelator, DIBI, can reduce lung injury induced by P. aeruginosa, via its anti-bacterial and anti-inflammatory effects.
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Affiliation(s)
- Xiyang Zhang
- Department of Anesthesia, Pain Management and Perioperative Medicine, Dalhousie University, Halifax, NS B3H 1X5, Canada; (X.Z.); (J.Z.)
- Department of Anesthesiology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
- Guangdong Provincial Key Laboratory of Precision Anaesthesia and Perioperative Organ Protection, Guangzhou 510515, China
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS B3H 1X5, Canada; (R.N.); (L.B.); (B.H.); (Z.C.)
| | - Rhea Nickerson
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS B3H 1X5, Canada; (R.N.); (L.B.); (B.H.); (Z.C.)
| | - Lauren Burton
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS B3H 1X5, Canada; (R.N.); (L.B.); (B.H.); (Z.C.)
| | - Ashley Stueck
- Department of Pathology, Dalhousie University, Halifax, NS B3H 1X5, Canada;
| | - Bruce Holbein
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS B3H 1X5, Canada; (R.N.); (L.B.); (B.H.); (Z.C.)
| | - Zhenyu Cheng
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS B3H 1X5, Canada; (R.N.); (L.B.); (B.H.); (Z.C.)
| | - Juan Zhou
- Department of Anesthesia, Pain Management and Perioperative Medicine, Dalhousie University, Halifax, NS B3H 1X5, Canada; (X.Z.); (J.Z.)
| | - Christian Lehmann
- Department of Anesthesia, Pain Management and Perioperative Medicine, Dalhousie University, Halifax, NS B3H 1X5, Canada; (X.Z.); (J.Z.)
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS B3H 1X5, Canada; (R.N.); (L.B.); (B.H.); (Z.C.)
- Department of Physiology & Biophysics, Dalhousie University, Halifax, NS B3H 1X5, Canada
- Department of Pharmacology, Dalhousie University, Halifax, NS B3H 4R2, Canada
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Li X, Zhu L, Ma R, Zhang X, Lin C, Tang Y, Huang Z, Wang C. Effects of iron additives on the removal of antibiotics and antibiotic resistance genes in anaerobic fermentation of food waste. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 347:119038. [PMID: 37769470 DOI: 10.1016/j.jenvman.2023.119038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 09/04/2023] [Accepted: 09/17/2023] [Indexed: 09/30/2023]
Abstract
The presence of antibiotics and antibiotic resistance genes (ARGs) in food waste (FW) during anaerobic fermentation poses significant environmental and health risks. This study elucidated the potential of iron additives, specifically 500-nm and 50-nm zero-valent iron (ZVI) and magnetite, in mitigating these contaminants. These findings revealed that 500-nm magnetite significantly reduced tetracyclines by 81.04%, while 500-nm ZVI effectively reduced cefotaxime by 89.90%. Furthermore, both 500-nm and 50-nm ZVI were observed to decrease different types and abundance of heavy metal resistance and virulence genes. Interestingly, while 500-nm ZVI reduced the overall abundance of ARGs by 50%, 500-nm magnetite primarily reduced the diversity of ARGs without significantly impacting their abundance. These results elucidate the efficacy of iron additives in addressing antibiotic contamination and resistance during the anaerobic fermentation process of FW. The findings acquired from this study mitigate the development of innovative and environmentally sustainable technologies for FW treatment, emphasizing the reduction of environmental risks and enhancement of treatment efficiency.
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Affiliation(s)
- Xiaotian Li
- College of Natural Resources and Environment, South China Agricultural University, No. 483 Wushan Road, Tianhe District, Guangzhou, 510642, PR China.
| | - Langping Zhu
- College of Natural Resources and Environment, South China Agricultural University, No. 483 Wushan Road, Tianhe District, Guangzhou, 510642, PR China
| | - Rong Ma
- College of Natural Resources and Environment, South China Agricultural University, No. 483 Wushan Road, Tianhe District, Guangzhou, 510642, PR China
| | - Xiaozhi Zhang
- College of Natural Resources and Environment, South China Agricultural University, No. 483 Wushan Road, Tianhe District, Guangzhou, 510642, PR China
| | - Changquan Lin
- College of Natural Resources and Environment, South China Agricultural University, No. 483 Wushan Road, Tianhe District, Guangzhou, 510642, PR China
| | - Youqian Tang
- College of Natural Resources and Environment, South China Agricultural University, No. 483 Wushan Road, Tianhe District, Guangzhou, 510642, PR China
| | - Zhuoshen Huang
- College of Natural Resources and Environment, South China Agricultural University, No. 483 Wushan Road, Tianhe District, Guangzhou, 510642, PR China
| | - Chunming Wang
- College of Natural Resources and Environment, South China Agricultural University, No. 483 Wushan Road, Tianhe District, Guangzhou, 510642, PR China.
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