- •PDT using both ALA and EDTA-2Na showed bactericidal effect against PS.
- •EDTA-2Na inhibited to produce biofilm of PA.
- •PDT using both ALA and EDTA-2Na healed faster wound infected with PA than non-PDT.
Pseudomonas aeruginosa (PA) frequently develops antibiotic-resistant characteristics, which is clinically problematic. The main reason behind the rise of antibiotic-resistant PA is the extensive use of antibiotics. Therefore, a novel technique is needed to treat PA infections. Photodynamic therapy (PDT) is thought to have the potential to be a non-antibiotic treatment for infections. 5-Aminolevulinic acid (ALA), which works as a photosensitizer after being metabolized into protoporphyrin IX (PpIX) in the heme synthetic pathway, is used for PDT. Thus far, the in vivo effectiveness of PDT using ALA against PA is unknown.
In this study, we investigated PDT using ALA both in vitro and in vivo.
Methods and results
Although PDT with ALA alone did not show a bactericidal effect on PA, PDT with both ALA and EDTA-2Na had a bactericidal effect in vitro. In in vivo experiments, wounds healed faster in PA-infected mice treated with PDT using both EDTA-2Na and ALA compared to non-PDT.
These results suggest that PDT with EDTA-2Na and ALA is a potential novel treatment option for PA-infected wounds.
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Published online: March 05, 2018
Accepted: March 2, 2018
Received in revised form: February 14, 2018
Received: June 18, 2017
© 2018 Published by Elsevier B.V. on behalf of Japanese Society for Investigative Dermatology.