Rose bengal-mediated photoinactivation of multidrug resistant Pseudomonas aeruginosa is enhanced in the presence of antimicrobial peptides

Joanna Nakonieczna , Katarzyna Wolnikowska , Patrycja Ogonowska , Damian Neubauer , Agnieszka Bernat , Wojciech Kamysz


Due to the overuse of antibiotics in medicine and food production, and their targeted mechanism of action, an increasing rate in spreading of antibiotic resistance genes has been noticed. This results in inefficient therapy outcomes and higher mortality all over the world. Pseudomonas aeruginosa (carbapenem-resistant) is considered one of the top three critical species according to the World Health Organization’s priority pathogens list. This means that new drugs and/or treatments are needed to tackle infections caused by this bacterium. In this context search for new/alternative approaches that would overcome resistance to classical antimicrobials is of prime importance. The use of antimicrobial photodynamic inactivation (aPDI) and antimicrobial peptides (AMPs) is an efficient strategy to treat localized infections caused by multidrug-resistant P. aeruginosa. In this study, we have treated P. aeruginosa cells photodynamically in the presence and in the absence of AMP (CAMEL or pexiganan). The conditions for aPDI were as follows: rose bengal (RB) as a photosensitizing agent at 1–10 mM concentration, and subsequent irradiation with 514 nm-LED at 23 mW/cm2 irradiance. The analysis of cell number after the treatment has shown that the combined action of RB-mediated aPDI and cationic AMPs reduced the number of viable cells below the limit of detection (<1log10 CFU/ml). This was in contrast to no reduction or partial reduction after aPDI or AMP applied separately. Students t-test was applied to test the statistical significance of the results. Noteworthy, our treatment proved to be effective against all 35 clinical isolates of P. aeruginosa tested within this study, including those characterized as multiresistant. Moreover, we demonstrated that such treatment is safe and does not violate the growth dynamics of human keratinocytes (77.3–97.64% survival depending on the concentration of the studied compounds or their mixtures).
Author Joanna Nakonieczna (IFB / IB / DBiotech)
Joanna Nakonieczna,,
- Department of Biotechnology
, Katarzyna Wolnikowska (IFB)
Katarzyna Wolnikowska,,
- Intercollegiate Faculty of Biotechnology UG
, Patrycja Ogonowska (IFB)
Patrycja Ogonowska,,
- Intercollegiate Faculty of Biotechnology UG
, Damian Neubauer
Damian Neubauer,,
, Agnieszka Bernat (IFB / IB / DBiotech) - [Polish Academy of Science]
Agnieszka Bernat,,
- Department of Biotechnology
- Polska Akademia Nauk
, Wojciech Kamysz
Wojciech Kamysz,,
Journal seriesFrontiers in Microbiology, ISSN 1664-302X, (A 35 pkt)
Issue year2018
Publication size in sheets0.7
Keywords in Englishantibiotic resistance, Pseudomonas aeruginosa, photoinactivation, CAMEL, pexiganan, XDR, MDR, antimicrobial peptides
Languageen angielski
Score (nominal)35
ScoreMinisterial score = 35.0, 05-10-2018, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 05-10-2018, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 4.076 (2) - 2016=4.526 (5)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.