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Riahi A, Mabudi H, Tajbakhsh E, Roomiani L, Momtaz H. Optimizing chitosan derived from Metapenaeus affinis: a novel anti-biofilm agent against Pseudomonas aeruginosa. AMB Express 2024; 14:77. [PMID: 38949677 PMCID: PMC11217230 DOI: 10.1186/s13568-024-01732-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2024] [Accepted: 06/19/2024] [Indexed: 07/02/2024] Open
Abstract
Pseudomonas aeruginosa is a commonly found Gram-negative bacterium in healthcare facilities and is renowned for its ability to form biofilms and its virulence factors that are controlled by quorum sensing (QS) systems. The increasing prevalence of multidrug-resistant strains of this bacterium poses a significant challenge in the field of medicine. Consequently, the exploration of novel antimicrobial agents has become a top priority. This research aims to optimize chitosan derived from white shrimp (Metapenaeus affinis) using the Response Surface Methodology (RSM) computational approach. The objective is to investigate chitosan's potential as a solution for inhibiting QS activity and biofilm formation in P. aeruginosa ATCC 10,145. Under optimized conditions, chitin was treated with NaOH (1.41 M) for 15.75 h, HCl (7.49% vol) for 2.01 h, and at a deacetylation temperature of 81.15 °C. The resulting chitosan exhibited a degree of deacetylation (DD%) exceeding 93.98%, as confirmed by Fourier-transform infrared (FTIR) spectral analysis, indicating its high purity. The extracted chitosan demonstrated a significant synergistic antibiotic effect against P. aeruginosa when combined with ceftazidime, enhancing its bactericidal activity by up to 15-fold. In addition, sub-MIC (minimum inhibitory concentration) concentrations of extracted chitosan (10 and 100 µg/mL) successfully reduced the production of pyocyanin and rhamnolipid, as well as the swimming motility, protease activity and biofilm formation ability in comparison to the control group (P < 0.05). Moreover, chitosan treatment downregulated the RhlR and LasR genes in P. aeruginosa when compared to the control group (P < 0.05). The optimized chitosan extract shows significant potential as a coating agent for surgical equipment, effectively preventing nosocomial infections caused by P. aeruginosa pathogens.
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Affiliation(s)
- Anali Riahi
- Department of Microbiology, Faculty of Basic Sciences, Islamic Azad University, Shahrekord Branch, Shahrekord, Iran
| | - Hadideh Mabudi
- Department of Fisheries, Islamic Azad University, Golestan highway, Farhang Shahr, Ahvaz Branch, PO Box 1915, 61349-37333, Ahvaz, Iran.
| | - Elahe Tajbakhsh
- Department of Microbiology, Faculty of Basic Sciences, Islamic Azad University, Shahrekord Branch, Shahrekord, Iran
| | - Laleh Roomiani
- Department of Fisheries, Islamic Azad University, Golestan highway, Farhang Shahr, Ahvaz Branch, PO Box 1915, 61349-37333, Ahvaz, Iran
| | - Hasan Momtaz
- Department of Microbiology, Faculty of Basic Sciences, Islamic Azad University, Shahrekord Branch, Shahrekord, Iran
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Kašparová P, Vaňková E, Paldrychová M, Svobodová A, Hadravová R, Jarošová Kolouchová I, Masák J, Scholtz V. Non-thermal plasma causes Pseudomonas aeruginosa biofilm release to planktonic form and inhibits production of Las-B elastase, protease and pyocyanin. Front Cell Infect Microbiol 2022; 12:993029. [PMID: 36211963 PMCID: PMC9544392 DOI: 10.3389/fcimb.2022.993029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 08/29/2022] [Indexed: 11/13/2022] Open
Abstract
The increasing risk of antibiotic failure in the treatment of Pseudomonas aeruginosa infections is largely related to the production of a wide range of virulence factors. The use of non-thermal plasma (NTP) is a promising alternative to antimicrobial treatment. Nevertheless, there is still a lack of knowledge about the effects of NTP on the virulence factors production. We evaluated the ability of four NTP-affected P. aeruginosa strains to re-form biofilm and produce Las-B elastase, proteases, lipases, haemolysins, gelatinase or pyocyanin. Highly strains-dependent inhibitory activity of NTP against extracellular virulence factors production was observed. Las-B elastase activity was reduced up to 82% after 15-min NTP treatment, protease activity and pyocyanin production by biofilm cells was completely inhibited after 60 min, in contrast to lipases and gelatinase production, which remained unchanged. However, for all strains tested, a notable reduction in biofilm re-development ability was depicted using spinning disc confocal microscopy. In addition, NTP exposure of mature biofilms caused disruption of biofilm cells and their dispersion into the environment, as shown by transmission electron microscopy. This appears to be a key step that could help overcome the high resistance of P. aeruginosa and its eventual elimination, for example in combination with antibiotics still highly effective against planktonic cells.
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Affiliation(s)
- Petra Kašparová
- Laboratory of Applied Biology, Department of Biotechnology, University of Chemistry and Technology in Prague, Prague, Czechia
- Laboratory of Non-thermal Plasma, Department of Physics and Measurements, University of Chemistry and Technology in Prague, Prague, Czechia
- *Correspondence: Petra Kašparová,
| | - Eva Vaňková
- Laboratory of Applied Biology, Department of Biotechnology, University of Chemistry and Technology in Prague, Prague, Czechia
- Laboratory of Non-thermal Plasma, Department of Physics and Measurements, University of Chemistry and Technology in Prague, Prague, Czechia
| | - Martina Paldrychová
- Laboratory of Applied Biology, Department of Biotechnology, University of Chemistry and Technology in Prague, Prague, Czechia
- Laboratory of Non-thermal Plasma, Department of Physics and Measurements, University of Chemistry and Technology in Prague, Prague, Czechia
| | - Alžběta Svobodová
- Laboratory of Applied Biology, Department of Biotechnology, University of Chemistry and Technology in Prague, Prague, Czechia
| | - Romana Hadravová
- Viral and Microbial Proteins, Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czechia
| | - Irena Jarošová Kolouchová
- Laboratory of Applied Biology, Department of Biotechnology, University of Chemistry and Technology in Prague, Prague, Czechia
| | - Jan Masák
- Laboratory of Applied Biology, Department of Biotechnology, University of Chemistry and Technology in Prague, Prague, Czechia
| | - Vladimir Scholtz
- Laboratory of Non-thermal Plasma, Department of Physics and Measurements, University of Chemistry and Technology in Prague, Prague, Czechia
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