Eckl, Daniel Bernhard and Hoffmann, Anja Karen and Landgraf, Nicole and Kalb, Larissa and Baessler, Pauline and Wallner, Susanne and Eichner, Anja and Huber, Harald and Hackbarth, Steffen and Baeumler, Wolfgang (2023) Photodynamic inactivation of different pathogenic bacteria on human skin using a novel photosensitizer hydrogel. JOURNAL OF THE EUROPEAN ACADEMY OF DERMATOLOGY AND VENEREOLOGY, 37 (8). pp. 1649-1658. ISSN 0926-9959, 1468-3083
Full text not available from this repository.Abstract
BackgroundThe colonization of skin with pathogenic, partially antibiotic-resistant bacteria is frequently a severe problem in dermatological therapies. For instance, skin colonization with Staphylococcus aureus is even a disease-promoting factor in atopic dermatitis. The photodynamic inactivation (PDI) of bacteria could be a new antibacterial procedure. Upon irradiation with visible light, a special photosensitizer exclusively generates singlet oxygen. This reactive oxygen species kills bacteria via oxidation independent of species or strain and their antibiotic resistance profile causing no bacterial resistance on its part. ObjectiveTo investigate the antibacterial potential of a photosensitizer, formulated in a new hydrogel, on human skin ex vivo. MethodsThe photochemical stability of the photosensitizer and its ability to generate singlet oxygen in the hydrogel was studied. Antimicrobial efficacy of this hydrogel was tested step by step, firstly on inanimate surfaces and then on human skin ex vivo against S. aureus and Pseudomonas aeruginosa using standard colony counting. NBTC staining and TUNEL assays were performed on skin biopsies to investigate potential necrosis and apoptosis effects in skin cells possibly caused by PDI. ResultsNone of the hydrogel components affected the photochemical stability and the life time of singlet oxygen. On inanimate surfaces as well as on the human skin, the number of viable bacteria was reduced by up to 4.8 log(10) being more effective than most other antibacterial topical agents. Histology and assays showed that PDI against bacteria on the skin surface caused no harmful effects on the underlying skin cells. ConclusionPhotodynamic inactivation hydrogel proved to be effective for decolonization of human skin including the potential to act against superficial skin infections. Being a water-based formulation, the hydrogel should be also suitable for the mucosa. The results of the present ex vivo study form a good basis for conducting clinical studies in vivo.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | RESISTANT STAPHYLOCOCCUS-AUREUS; SINGLET OXYGEN; ANTIBIOTIC-RESISTANCE; THERAPY; INFECTIONS; SUSCEPTIBILITY; ANTIBACTERIAL; EFFICACY; AGENTS; LASER; |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Dermatologie und Venerologie Medicine > Abteilung für Krankenhaushygiene und Infektiologie Biology, Preclinical Medicine > Institut für Biochemie, Genetik und Mikrobiologie > Lehrstuhl für Mikrobiologie (Archaeenzentrum) > Prof. Dr. Dina Grohmann |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 08 Mar 2024 10:45 |
| Last Modified: | 08 Mar 2024 10:45 |
| URI: | https://pred.uni-regensburg.de/id/eprint/59139 |
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