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Wang S, Ma C, Long J, Cheng P, Zhang Y, Peng L, Fu L, Yu Y, Xu D, Zhang S, Qiu J, He Y, Yang H, Chen H. Impact of CRAMP-34 on Pseudomonas aeruginosa biofilms and extracellular metabolites. Front Cell Infect Microbiol 2023; 13:1295311. [PMID: 38162583 PMCID: PMC10757720 DOI: 10.3389/fcimb.2023.1295311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Accepted: 11/30/2023] [Indexed: 01/03/2024] Open
Abstract
Biofilm is a structured community of bacteria encased within a self-produced extracellular matrix. When bacteria form biofilms, they undergo a phenotypic shift that enhances their resistance to antimicrobial agents. Consequently, inducing the transition of biofilm bacteria to the planktonic state may offer a viable approach for addressing infections associated with biofilms. Our previous study has shown that the mouse antimicrobial peptide CRAMP-34 can disperse Pseudomonas aeruginosa (P. aeruginosa) biofilm, and the potential mechanism of CRAMP-34 eradicate P. aeruginosa biofilms was also investigated by combined omics. However, changes in bacterial extracellular metabolism have not been identified. To further explore the mechanism by which CRAMP-34 disperses biofilm, this study analyzed its effects on the extracellular metabolites of biofilm cells via metabolomics. The results demonstrated that a total of 258 significantly different metabolites were detected in the untargeted metabolomics, of which 73 were downregulated and 185 were upregulated. Pathway enrichment analysis of differential metabolites revealed that metabolic pathways are mainly related to the biosynthesis and metabolism of amino acids, and it also suggested that CRAMP-34 may alter the sensitivity of biofilm bacteria to antibiotics. Subsequently, it was confirmed that the combination of CRAMP-34 with vancomycin and colistin had a synergistic effect on dispersed cells. These results, along with our previous findings, suggest that CRAMP-34 may promote the transition of PAO1 bacteria from the biofilm state to the planktonic state by upregulating the extracellular glutamate and succinate metabolism and eventually leading to the dispersal of biofilm. In addition, increased extracellular metabolites of myoinositol, palmitic acid and oleic acid may enhance the susceptibility of the dispersed bacteria to the antibiotics colistin and vancomycin. CRAMP-34 also delayed the development of bacterial resistance to colistin and ciprofloxacin. These results suggest the promising development of CRAMP-34 in combination with antibiotics as a potential candidate to provide a novel therapeutic approach for the prevention and treatment of biofilm-associated infections.
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Affiliation(s)
- Shiyuan Wang
- College of Veterinary Medicine, Southwest University, Chongqing, China
- Collaborative Innovation Institute National Center of Technology Innovation for Pigs, Chongqing, China
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Chengjun Ma
- College of Veterinary Medicine, Southwest University, Chongqing, China
- Collaborative Innovation Institute National Center of Technology Innovation for Pigs, Chongqing, China
- Immunology Research Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Jinying Long
- College of Veterinary Medicine, Southwest University, Chongqing, China
- Collaborative Innovation Institute National Center of Technology Innovation for Pigs, Chongqing, China
- Immunology Research Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Peng Cheng
- College of Veterinary Medicine, Southwest University, Chongqing, China
- Collaborative Innovation Institute National Center of Technology Innovation for Pigs, Chongqing, China
| | - Yang Zhang
- Collaborative Innovation Institute National Center of Technology Innovation for Pigs, Chongqing, China
- Institute of Veterinary Medicine Academy of Animal Sciences, Chongqing, China
| | - Lianci Peng
- College of Veterinary Medicine, Southwest University, Chongqing, China
- Collaborative Innovation Institute National Center of Technology Innovation for Pigs, Chongqing, China
- Immunology Research Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Lizhi Fu
- Collaborative Innovation Institute National Center of Technology Innovation for Pigs, Chongqing, China
- Institute of Veterinary Medicine Academy of Animal Sciences, Chongqing, China
| | - Yuandi Yu
- Collaborative Innovation Institute National Center of Technology Innovation for Pigs, Chongqing, China
- Institute of Veterinary Medicine Academy of Animal Sciences, Chongqing, China
| | - Dengfeng Xu
- Collaborative Innovation Institute National Center of Technology Innovation for Pigs, Chongqing, China
- Institute of Veterinary Medicine Academy of Animal Sciences, Chongqing, China
| | - Suhui Zhang
- Collaborative Innovation Institute National Center of Technology Innovation for Pigs, Chongqing, China
- Institute of Veterinary Medicine Academy of Animal Sciences, Chongqing, China
| | - Jinjie Qiu
- Collaborative Innovation Institute National Center of Technology Innovation for Pigs, Chongqing, China
- Institute of Veterinary Medicine Academy of Animal Sciences, Chongqing, China
| | - Yuzhang He
- College of Veterinary Medicine, Southwest University, Chongqing, China
- Collaborative Innovation Institute National Center of Technology Innovation for Pigs, Chongqing, China
- Immunology Research Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Hongzao Yang
- College of Veterinary Medicine, Southwest University, Chongqing, China
- Collaborative Innovation Institute National Center of Technology Innovation for Pigs, Chongqing, China
- Immunology Research Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Hongwei Chen
- College of Veterinary Medicine, Southwest University, Chongqing, China
- Collaborative Innovation Institute National Center of Technology Innovation for Pigs, Chongqing, China
- Immunology Research Center, Medical Research Institute, Southwest University, Chongqing, China
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