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Rutin-coated zinc oxide nanoparticles: a promising antivirulence formulation against pathogenic bacteria

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Abstract

The use of engineered nanoparticles against pathogenic bacteria has gained attention. In this study, zinc oxide nanoparticles conjugated with rutin were synthesized and their antivirulence properties against Pseudomonas aeruginosa and Staphylococcus aureus. The physicochemical characteristics of ZnO-Rutin NPs were investigated using SEM, FT-IR, XRD, DLS, EDS, and zeta potential analyses. Antimicrobial properties were evaluated by well diffusion, microdilution, growth curve, and hemolytic activity assays. The expression of quorum sensing (QS) genes including the lasI and rhlI in P. aeruginosa and agrA in S. aureus was assessed using real-time PCR. Swimming, swarming, twitching, and pyocyanin production by P. aeruginosa were evaluated. The NPs were amorphous, 14–100 nm in diameter, surface charge of -34.3 mV, and an average hydrodynamic size of 161.7 nm. Regarding the antibacterial activity, ZnO-Rutin NPs were more potent than ZnO NPs and rutin, and stronger inhibitory effects were observed on S. aureus than on P. aeruginosa. ZnO-Rutin NPs inhibited the hemolytic activity of P. aeruginosa and S. aureus by 93.4 and 92.2%, respectively, which was more efficient than bare ZnO NPs and rutin. ZnO-Rutin NPs reduced the expression of the lasI and rhlI in P. aeruginosa by 0.17–0.43 and 0.37–0.70 folds, respectively while the expression of the agrA gene in S. aureus was decreased by 0.46–0.56 folds. Furthermore, ZnO-Rutin NPs significantly reduced the swimming and twitching motility and pyocyanin production of P. aeruginosa. This study demonstrates the antivirulence features of ZnO-Rutin NPs against pathogenic bacteria which can be associated with their QS inhibitory effects.

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The majority of data that support the findings of this study are included in the manuscript. Additional data are available from the corresponding authors upon reasonable request.

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Acknowledgements

The authors would like to thank the Lahijan Branch of Islamic Azad University and University of Guilan for providing the facilities to carry out this study.

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The authors have not disclosed any funding.

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F.A.A. Investigation, Methodology, Formal analysis; B.R. Conceptualization, Project administration, Resources, Supervision, Funding acquisition, Writing - review & editing; H.Z. Conceptualization, Project administration, Validation, Supervision, Software, Writing - original draft; M.M. Data Curation, Visualization; A.M. Data Curation, Visualization

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Correspondence to Behnam Rasti or Hojjatolah Zamani.

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Alidoust, F.A., Rasti, B., Zamani, H. et al. Rutin-coated zinc oxide nanoparticles: a promising antivirulence formulation against pathogenic bacteria. World J Microbiol Biotechnol 40, 184 (2024). https://doi.org/10.1007/s11274-024-03984-2

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  • DOI: https://doi.org/10.1007/s11274-024-03984-2

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