Abstract
Antimicrobial photodynamic therapy (aPDT) is an alternative approach. The current study aimed to investigate the efficacy of aPDT with indocyanine green (ICG) against two Candida albicans (C. albicans) strains. In this in vitro study, the inoculum of standard ATCC 10,231 (S) and fluconazole-resistant (FR) strains were adjusted to the turbidity of a 0.5 McFarland standard. Each strain was allocated into 4 groups: S1 and FR1) control groups, S2 and FR2) ICG-treated groups (1 µg/mL), S3 and FR3) laser-irradiated groups (wavelength: 810 nm; mode: continuous-wave; output power: 300 mW; spot size: 4.5 mm; exposure time: 120 s; radiation dose: 228 J/cm2), S4 and FR4) ICG-mediated-aPDT groups. After treatments, the number of colony-forming units per milliliter (CFU/mL) was calculated. Using the XTT reduction assay, the effects of each treatment on Candida biofilm formation were evaluated. Data were analyzed using SPSS software version 22. In both strains, the maximum number of CFUs was observed in the control group, followed by ICG-treated, laser-irradiated, and ICG-mediated-aPDT groups. In ATCC 10,231 strain, the XTT assay exhibited significant difference between ICG-mediated-aPDT and control groups (p < 0.0001). However, the ICG, laser, and ICG-mediated-aPDT groups in fluconazole-resistant strain showed significant differences when compared with the control (p < 0.05). The mean Candida CFUs and the XTT assay did not show any significant difference between the ATCC 10,231 and fluconazole-resistant strains with respect to each treatment. Data suggest ICG-mediated-aPDT could diminish Candida CFUs in laboratory; however, further studies are warranted to confirm its efficacy and safety to be applied in clinics.
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Acknowledgements
The authors would like to thank the Vice-Chancellor for Research Affairs of Shiraz University of Medical Sciences, Shiraz, Iran for their financial support (grant no. 16549). The authors wish to thank Dr. Laleh Khojasteh at the Research Consultation Center (RCC) of Shiraz University of Medical Sciences for her invaluable assistance in editing this manuscript. This manuscript is based on a thesis submitted in partial fulfillment of the requirements for the degree of Doctor of Dental Medicine by Omid Kamrani.
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Mardani, M., Kamrani, O. Effectiveness of antimicrobial photodynamic therapy with indocyanine green against the standard and fluconazole-resistant Candida albicans. Lasers Med Sci 36, 1971–1977 (2021). https://doi.org/10.1007/s10103-021-03389-9
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DOI: https://doi.org/10.1007/s10103-021-03389-9