title: Light-activated nanofibre textiles exert antibacterial effects in the setting of chronic wound healing.
abstract: The maintenance of an aseptic environment for chronic wounds is one of the most challenging tasks in the wound-healing process. Furthermore, the emergence of antibiotic-resistant bacterial strains is on the rise, rendering conventional treatments less effective. A new antibacterial material consisting of a polyurethane Tecophilic(™)  nanofibre textile (NT) that was prepared by electrospinning and doped by a tetraphenylporphyrin (TPP) photosensitizer activated by visible light was tested for use in wound beds and bandages. In vitro experiments were performed to assess the antibacterial activity of the textile against three bacterial strains. Furthermore, the new textile was tested in 162 patients with chronic leg ulcers. A complete inhibition of in vitro growth of the three tested bacterial strains was observed on the surface of NTs that had been illuminated with visible light and was clinically demonstrated in 89 patients with leg ulcers. The application of the textiles resulted in a 35% decrease in wound size, as assessed via computer-aided wound tracing. Wound-related pain, which was estimated using a visual analogue scale, was reduced by 71%. The results of this trial reveal that the photoinactivation of bacteria through the photosensitized generation of short-lived, highly reactive singlet oxygen O(2) ((1) Δ(g) ) results in relatively superficial antibacterial effects in comparison with standard antiseptic treatment options. Thus, such treatment does not interfere with the normal healing process. This method therefore represents a suitable alternative to the use of topical antibiotics and antiseptics and demonstrates potentially broad applications in medicine.
authors: Department of Dermatology, Third Faculty of Medicine, Charles University in Prague, Prague, Czech Republic. arenbergerova@email.cz
authors: Monika
authors: M
authors: Arenbergerova
authors: Petr
authors: P
authors: Arenberger
authors: Marek
authors: M
authors: Bednar
authors: Pavel
authors: P
authors: Kubat
authors: Jiri
authors: J
authors: Mosinger
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000900:Anti-Bacterial Agents / Q000494:pharmacology / Q000627:therapeutic use*; D000891:Anti-Infective Agents, Local / Q000627:therapeutic use; D001424:Bacterial Infections / Q000188:drug therapy* / Q000473:pathology / Q000503:physiopathology; D001458:Bandages; D005260:Female; D006801:Humans; D066298:In Vitro Techniques; D007871:Leg Ulcer / Q000188:drug therapy* / Q000382:microbiology* / Q000503:physiopathology; D008027:Light; D008297:Male; D008875:Middle Aged; D057139:Nanofibers / Q000627:therapeutic use*; D010147:Pain Measurement; D011140:Polyurethanes; D011166:Porphyrins; D013784:Textiles; D016896:Treatment Outcome; D014945:Wound Healing / Q000187:drug effects / Q000502:physiology*
chemical_list: D000900:Anti-Bacterial Agents; D000891:Anti-Infective Agents, Local; D011140:Polyurethanes; D011166:Porphyrins; C409084:tetraphenylporphyrin