Rose Bengal-Mediated Photodynamic Therapy to Inhibit Candida albicans

Area of Science:

• Mycology
• Infectious Diseases
• Biomedical Engineering

Background:

• Invasive Candida albicans infections are a major health concern, with high mortality rates (~50%) and increasing drug resistance.
• Current antifungal medications are becoming less effective against multidrug-resistant Candida albicans strains.
• Antimicrobial photodynamic therapy (aPDT) presents a potential alternative or supplementary treatment to combat these resistant infections.

Purpose of the Study:

• To evaluate the efficacy of Rose bengal-mediated antimicrobial photodynamic therapy (RB-aPDT) against multidrug-resistant Candida albicans.
• To determine the optimal conditions for RB-aPDT in inhibiting Candida albicans growth.
• To explore RB-aPDT as a strategy to overcome antifungal drug resistance.

Main Methods:

• Development of a custom green light-emitting diode (LED) light source for precise illumination.
• Incubation of Candida albicans with varying concentrations of Rose bengal (RB) in a 96-well plate format.
• Illumination with specific green light fluences and subsequent analysis of yeast killing effects using the plate dilution method.

Main Results:

• An optimal combination of green light and Rose bengal achieved a significant 3-log growth inhibition of multidrug-resistant Candida albicans.
• The study demonstrated the killing effects of RB-aPDT on resistant fungal strains.
• The experimental setup using a homemade green LED light source proved effective for aPDT application.

Conclusions:

• Rose bengal-mediated antimicrobial photodynamic therapy (RB-aPDT) shows significant potential for inhibiting the growth of drug-resistant Candida albicans.
• RB-aPDT may serve as a viable alternative or adjuvant therapy to combat invasive candidiasis.
• Further research into RB-aPDT could lead to novel strategies against multidrug-resistant fungal pathogens.