Curcumin/H2O2 photodynamically activated: an antimicrobial time-response assessment against an MDR strain of Candida albicans
C. Casu, G. Orrù, A. Scano Department of Surgical Sciences, Oral Biotechnology Laboratory (OBL), University of Cagliari, Cagliari, Italy. orru@unica.it
OBJECTIVE: Human candidiasis is typically treated with antifungal drugs, but the rise of drug-resistant strains of Candida spp. poses a serious problem, making treatment difficult. At the same time, photodynamic therapy (PDT) has drawn increasing attention from researchers for its potential to effectively inhibit multidrug-resistant pathogenic fungi and for its low tendency to induce drug resistance. This study’s goal was to examine how a multidrug-resistant oral isolate of Candida albicans responded to a PDT that used a curcumin/H202 formulation as a photosensitizer and was exposed to various light sources.
MATERIALS AND METHODS: A commercial product containing curcumin/H2O2 3% was used as a photosensitizer and evaluated in a PDT treatment that can use two different light sources: traditional irradiation with 7 W light at λ = 460 nm or a new, never evaluated, polarized light source of 25 W with a wavelength range of λ = 380-3,400 nm. The antimicrobial activity of these procedures was assessed on a clinical oral isolate of Candida albicans, in terms of agar susceptibility test, growth curve behavior, and biofilm inhibition.
RESULTS: Both light sources were able to activate the photosensitizer formulation, suggesting a fungistatic activity vs. this C. albicans MDR strain. An interesting difference was observed in the cell-generation-time (CGTOD) after PDT treatment, where the polarized light was more active compared to the source of 460 nm. In fact, CGTOD was 16 and 8 hours, respectively.
CONCLUSIONS: The PDT evaluated here presented an inhibition window time, a crucial point for clinicians, who could activate an additional prophylactic treatment to resolve the clinical management of Candida infections in the oral cavity.
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To cite this article
C. Casu, G. Orrù, A. Scano
Curcumin/H2O2 photodynamically activated: an antimicrobial time-response assessment against an MDR strain of Candida albicans
Eur Rev Med Pharmacol Sci
Year: 2022
Vol. 26 - N. 23
Pages: 8841-8851
DOI: 10.26355/eurrev_202212_30556