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Effective photodynamic treatment of Trichophyton species with Rose Bengal |
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| Authors: | Jessica Houang Catriona Halliday Sharon Chen Chun-Hoong Ho Alina Bekmukhametova Antonio Lauto |
| Institution: | 1. School of Science, Western Sydney University, Penrith, New South Wales, Australia;2. Centre for Infectious Diseases and Microbiology Laboratory Services, ICPMR, Westmead Hospital, Westmead, New South Wales, Australia
Centre for Infectious Diseases and Microbiology, Westmead Millennium Institute, Westmead, New South Wales, Australia;3. Centre for Infectious Diseases and Microbiology Laboratory Services, ICPMR, Westmead Hospital, Westmead, New South Wales, Australia Centre for Infectious Diseases and Microbiology, Westmead Millennium Institute, Westmead, New South Wales, Australia Sydney Medical School, University of Sydney, Westmead, New South Wales, Australia |
| Abstract: | Photodynamic therapy (PDT) with Rose Bengal has previously achieved eradication of Trichophyton rubrum infections causing toenail onychomycosis; however, its antifungal activity against other clinically relevant dermatophytes has yet to be studied. Here, we test the efficacy of PDT using Rose Bengal (140 μM) and 532 nm irradiation (101 J/cm2) against Trichophyton mentagrophytes and Trichophyton interdigitale spores, in comparison to T. rubrum. A significant reduction (>99%) of T. mentagrophytes and T. interdigitale was observed, while actual eradication of viable T. rubrum was achieved (99.99%). Laser irradiation alone inhibited growth of T. rubrum (55.2%) and T. mentagrophytes (45.2%) significantly more than T. interdigitale (25.5%) (P = .0086), which may indicate an increased presence of fungal pigments, xanthomegnin and melanin. The findings suggest that Rose Bengal-PDT can act against a broader spectrum of fungal pathogens, and with continued development may be employed in a wider range of clinical antifungal applications. |
| Keywords: | melanin photodynamic therapy Rose Bengal Trichophyton interdigitale Trichophyton mentagrophytes Trichophyton rubrum xanthomegnin |