Abstract
The resistance development is an increasing global health risk that needs innovative solutions. Repurposing drugs to serve as anti-virulence agents is suggested as an advantageous strategy to diminish bacterial resistance development. Bacterial virulence is controlled by quorum sensing (QS) system that orchestrates the expression of biofilm formation, motility, and virulence factors production as enzymes and virulent pigments. Interfering with QS could lead to bacterial virulence mitigation without affecting bacterial growth that does not result in bacterial resistance development. This study investigated the probable anti-virulence and anti-QS activities of α-adrenoreceptor blocker doxazosin against Proteus mirabilis and Pseudomonas aeruginosa. Besides in silico study, in vitro and in vivo investigations were conducted to assess the doxazosin anti-virulence actions. Doxazosin significantly diminished the biofilm formation and release of QS-controlled Chromobacterium violaceum pigment and virulence factors in P. aeruginosa and P. mirabilis, and downregulated the QS encoding genes in P. aeruginosa. Virtually, doxazosin interfered with QS proteins, and in vivo protected mice against P. mirabilis and P. aeruginosa. The role of the membranal sensors as QseC and PmrA was recognized in enhancing the Gram-negative virulence. Doxazosin downregulated the membranal sensors PmR and QseC encoding genes and could in silico interfere with them. In conclusion, this study preliminary documents the probable anti-QS and anti-virulence activities of doxazosin, which indicate its possible application as an alternative or in addition to antibiotics. However, extended toxicological and pharmacological investigations are essential to approve the feasible clinical application of doxazosin as novel efficient anti-virulence agent.
Key points
• Anti-hypertensive doxazosin acquires anti-quorum sensing activities
• Doxazosin diminishes the virulence of Proteus mirabilis and Pseudomonas aeruginosa
• Doxazosin could dimmish the bacterial espionage
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This research work was funded by Institutional Fund Projects under grant no. (IFPIP:1623-166-1443). The authors gratefully acknowledge technical and financial support provided by the Ministry of Education and King Abdulaziz University, DSR, Jeddah, Saudi Arabia.
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This research work was funded by Institutional Fund Projects under grant no. (IFPIP:1623–166-1443).
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MAE, TSI, and WAHH conceived, designed the study, and analyzed data. WAAH, SSE, and AGE analyzed the data and wrote the first draft of this manuscript. ESK and MAMA did the software and wrote the final version of the manuscript. All authors read and approved the manuscript.
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Elfaky, M.A., Elbaramawi, S.S., Eissa, A.G. et al. Drug repositioning: doxazosin attenuates the virulence factors and biofilm formation in Gram-negative bacteria. Appl Microbiol Biotechnol 107, 3763–3778 (2023). https://doi.org/10.1007/s00253-023-12522-3
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DOI: https://doi.org/10.1007/s00253-023-12522-3