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Global priority multidrug-resistant pathogens do not resist photodynamic therapy.

Sabino, CP, Wainwright, M, Ribeiro, MS, Sellera, FP, Dos Anjos, C, Baptista, MDS and Lincopan, N (2020) Global priority multidrug-resistant pathogens do not resist photodynamic therapy. Jouranl of Photochemistry and Photobiology B: Biology, 208. ISSN 1011-1344

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Microbial drug-resistance demands immediate implementation of novel therapeutic strategies. Antimicrobial photodynamic therapy (aPDT) combines the administration of a photosensitizer (PS) compound with low-irradiance light to induce photochemical reactions that yield reactive oxygen species (ROS). Since ROS react with nearly all biomolecules, aPDT offers a powerful multitarget method to avoid selection of drug-resistant strains. In this study, we assayed photodynamic inactivation under a standardized method, combining methylene blue (MB) as PS and red light, against global priority pathogens. The species tested include Acinetobacter baumannii, Klebsiella aerogenes, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Enterococcus faecium, Enterococcus faecalis, Staphylococcus aureus, Candida albicans and Cryptococcus neoformans. Our strain collection presents resistance to all tested antimicrobials (>50). All drug-resistant strains were compared to their drug-sensitive counterparts. Regardless of resistance phenotype, MB-aPDT presented species-specific dose-response kinetics. More than 5log10 reduction was observed within less than 75 s of illumination for A. baumannii, E. coli, E. faecium, E. faecalis and S. aureus and within less than 7 min for K. aerogenes, K. pneumoniae, P. aeruginosa, C. albicans and C. neoformans. No signs of correlations in between drug-resistance profiles and aPDT sensitivity were observed. Therefore, MB-aPDT can provide effective therapeutic protocols for a very broad spectrum of pathogens. Hence, we believe that this study represents a very important step to bring aPDT closer to implementation into mainstream medical practices.

Item Type: Article
Uncontrolled Keywords: 0299 Other Physical Sciences, 0601 Biochemistry and Cell Biology
Subjects: R Medicine > RM Therapeutics. Pharmacology
Divisions: Pharmacy & Biomolecular Sciences
Publisher: Elsevier
Related URLs:
Date Deposited: 26 May 2020 10:25
Last Modified: 04 Sep 2021 07:15
DOI or ID number: 10.1016/j.jphotobiol.2020.111893
URI: https://researchonline.ljmu.ac.uk/id/eprint/13004
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