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Effects of Photodynamic Inactivation on the Growth and Antifungal Susceptibility of Rhizopus oryzae.
- Source :
-
Mycopathologia [Mycopathologia] 2019 Apr; Vol. 184 (2), pp. 315-319. Date of Electronic Publication: 2019 Jan 28. - Publication Year :
- 2019
-
Abstract
- Mucormycosis is an aggressive and high-mortality opportunistic fungal infection, especially in immunocompromised patients. Conventional antifungals or surgery showed a limited effect on this disease. The antimicrobial photodynamic therapy (aPDT) has been proven to be a promising therapeutic choice against multiple pathogenic fungi. We evaluated the effect of aPDT by using methylene blue (MB) combined with a light emitting diode (LED) on the viability of Rhizopus oryzae, as well as the antifungal susceptibility after aPDT treatment in vitro. A total of six strains were included in this study; MB (8, 16, and 32 μg/ml) was chosen for the photosensitizer, and a light source of LED (635 ± 10 nm, 12 J/cm <superscript>2</superscript> ) device was used to active it. aPDT with MB (32 μg/ml) and LED was highly effective in cell growth inhibition and exhibited colony-forming unit reductions of up to 4.3log <subscript>10</subscript> . The minimal inhibitory concentration ranges of itraconazole, posaconazole, and amphotericin B decreased from > 32 μg/ml to 4-8 μg/ml, 8-16 μg/ml to 0.5-2 μg/ml, and 2-4 μg/ml to 0.25-0.5 μg/ml, respectively, after pre-treatment with MB (8 μg/ml) and LED. In conclusion, aPDT with MB and LED was a promising therapeutic option against R. oryzae infections alone or combined with antifungal agents. However, further investigation is needed to determine the potential for clinic therapy and to elucidate the underlying mechanism.
- Subjects :
- Amphotericin B pharmacology
Azoles pharmacology
Colony Count, Microbial
Humans
Light
Methylene Blue pharmacology
Microbial Sensitivity Tests
Microbial Viability drug effects
Antifungal Agents pharmacology
Photosensitizing Agents pharmacology
Rhizopus drug effects
Rhizopus growth & development
Subjects
Details
- Language :
- English
- ISSN :
- 1573-0832
- Volume :
- 184
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Mycopathologia
- Publication Type :
- Academic Journal
- Accession number :
- 30689142
- Full Text :
- https://doi.org/10.1007/s11046-019-00321-2