ISSN: 0973-7510

E-ISSN: 2581-690X

Research Article | Open Access
Fatma Sonbol1, Tarek El-Banna1, Abdelaziz Elgaml2,3 and Khaled M. Aboelsuod2
1Department of Pharmaceutical Microbiology, Faculty of Pharmacy, Tanta University, Tanta 31527, Egypt.
2Department of Microbiology and Immunology, Faculty of Pharmacy, Horus University, New Damietta 34518, Egypt.
3Department of Microbiology and Immunology, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt.
J Pure Appl Microbiol. 2022;16(2):1226-1238 | Article Number: 7524 | © The Author(s). 2022
Received: 04/01/2022 | Accepted: 26/04/2022 | Published online: 31/05/2022
Issue online: June 2022

Pseudomonas aeruginosa is an important pathogen that is frequently associated with nosocomial infections. The goal of this work was to determine the relationship between the quorum sensing system (QS) and the production of virulence factors in P. aeruginosa. A number of 100 P. aeruginosa isolates were collected from various clinical sources from different Mansoura university hospitals in the period from April 2018 till April 2019. PCR screening of QS genes in the isolates was carried out including lasI, lasR, rhlI and rhlR. Thereafter, assay of the production of different virulence factors in the isolates was established including biofilm formation, pyocyanin production, protease production, lipase production, hemolysin production as well as swimming motility. Finally, statistical analysis of the data was performed to confirm the relationship between the QS and the production of virulence factors. Out of the 100 P. aeruginosa isolates, 27 clinical isolates were QS deficient. PCR analysis revealed that 8 isolates lacked lasR gene, 15 isolates lacked lasR and rhlR genes, 1 isolate lacked lasR and lasI genes, 2 isolates lacked lasR, lasI and rhlR genes and 1 isolate lacked rhlR, rhlI and lasR genes. There was a significant decrease observed in the production of pyocyanin, protease, lipase, hemolysin and biofilm formation as well as swimming motility in P. aeruginosa QS deficient isolates in comparison to non-QS deficient ones. There was a clear association between QS and virulence factors production in P. aeruginosa. This could open the door for novel promising targets for developing new therapeutic strategies against infections caused by this pathogen.


Pseudomonas aeruginosa, Quorum sensing, Regulation, Virulence factors

Article Metrics

Article View: 48

Share This Article

© The Author(s) 2022. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License which permits unrestricted use, sharing, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.