article · Microorganisms
Bacterial resistance presents a growing global challenge, prompting investigation into methods that reduce bacterial virulence rather than merely killing bacteria. Testing the effects of sodium citrate on Pseudomonas aeruginosa shows that it acts as an antivirulence agent in laboratory conditions. At sub-inhibitory concentrations, sodium citrate inhibits the formation of bacterial biofilms and reduces motility. It also decreases the production of key virulence factors, specifically protease and pyocyanin. Computational analyses indicate that citrate binds to and blocks quorum sensing receptors, the communication networks bacteria use to coordinate virulence, while laboratory assays confirm the downregulation of genes encoding these communication systems. By interfering with quorum sensing and suppressing aggressive traits without directly killing the bacteria, sodium citrate demonstrates potential as a safe supportive treatment alongside conventional antibiotics to combat resistant Pseudomonas aeruginosa infections.
Antibiotic resistance limits the effectiveness of conventional treatments, making persistent infections harder to clear. Rather than killing bacteria directly, disarming their virulence traits and breaking down protective biofilms can render them vulnerable. Demonstrating that a common, safe compound like sodium citrate disrupts bacterial communication offers a potential strategy to boost the effectiveness of existing antibiotic regimens against difficult hospital-acquired pathogens.
The findings point towards potential applications for pharmaceutical developers creating adjuvant therapies to combine with existing antibiotics against resistant infections. However, the evidence is limited to in silico modelling and in vitro laboratory experiments, placing the work at an early stage of research. Substantial animal testing and clinical development would be necessary before any formulated combination therapy could approach commercial healthcare use.
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The development of bacterial resistance is an insistent global health care issue, especially in light of the dwindled supply of new antimicrobial agents. This mandates the development of new innovative approaches to overcome the resistance development obstacle. Mitigation of bacterial virulence is an interesting approach that offers multiple advantages. Employing safe chemicals or drugs to mitigate bacterial virulence is an additive advantage. In the current study, the in vitro antivirulence activities of citrate were evaluated. Significantly, sodium citrate inhibited bacterial biofilm formation at sub-MIC concentrations. Furthermore, sodium citrate decreased the production of virulence factors protease and pyocyanin and diminished bacterial motility. Quorum sensing (QS) is the communicative system that bacterial cells utilize to communicate with each other and regulate the virulence of the host cells. In the present study, citrate in silico blocked the <i>Pseudomonas</i> QS receptors and downregulated the expression of QS-encoding genes. In conclusion, sodium citrate showed a significant ability to diminish bacterial virulence in vitro and interfered with QS; it could serve as a safe adjuvant to traditional antibiotic treatment for aggressive resistant bacterial infections such as <i>Pseudomonas aeruginosa</i> infections.
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DOI: 10.3390/microorganisms10051046
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