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Antimicrobial photodynamic therapy fighting polymicrobial infections – a journey from in vitro to in vivo

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Abstract

Rapidly evolving multidrug resistance renders conventional antimicrobial strategies increasingly inefficient. This urges the exploration of alternative strategies with a lower potential of resistance development to control microbial infections. A promising option is antimicrobial photodynamic therapy (aPDT), especially in the setting of wound infections. In this study its effectiveness was tested as a treatment option for polymicrobially infected wounds in both in vitro and in vivo models. First, aPDT was applied to wound-relevant Gram-positive and Gram-negative bacteria in planktonic culture as the standard in vitro test system and compared different media to show a possible dependency of the therapy on the surrounding environment. In a second step, aPDT was investigated in an in vitro model mimicking the wound bed conditions using fibrin-coated culture plates. Finally, we tested aPDT in vivo in a polymicrobial infected wound healing model in immunocompromised BALB/c mice. In vitro, it was shown that the bactericidal effectiveness of aPDT was strongly dependent on the surrounding environment of the phototoxic reaction. In vivo, the significant delay in wound healing induced by polymicrobial infection was drastically diminished by a two-times application of aPDT using 100 μM methylene blue (generally regarded as safe for topical application on human skin) and 24 J cm−2 pulsed red LED light. Our experiments suggest that aPDT is capable of significantly improving wound healing also in complicated polymicrobially infected wound situations.

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Authors and Affiliations

  1. Ludwig Boltzmann Institute for Experimental and Clinical Traumatology in the AUVA Research Center, Vienna, Austria

    Lisa Karner, Susanne Drechsler, Magdalena Metzger, Ara Hacobian, Barbara Schädl, Paul Slezak & Johannes Grillari

  2. University Clinic of Dentistry, Medical University of Vienna, Vienna, Austria

    Barbara Schädl

  3. Austrian Cluster for Tissue Regeneration, Vienna, Austria

    Barbara Schädl & Peter Dungel

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  1. Lisa Karner
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  2. Susanne Drechsler
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  3. Magdalena Metzger
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Correspondence to Peter Dungel.

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Electronic supplementary information (ESI) available. See DOI: 10.1039/d0pp00108b

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Karner, L., Drechsler, S., Metzger, M. et al. Antimicrobial photodynamic therapy fighting polymicrobial infections – a journey from in vitro to in vivo. Photochem Photobiol Sci 19, 1332–1343 (2020). https://doi.org/10.1039/d0pp00108b

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  • DOI: https://doi.org/10.1039/d0pp00108b

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