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The effects of aloe emodin-mediated antimicrobial photodynamic therapy on drug-sensitive and resistant Candida albicans

Abstract

The extensive and repetitive use of antifungal drugs has lead to the development of drug-resistant Candida albicans. Antimicrobial photodynamic therapy (aPDT) has received considerable attention as an emerging and promising approach to combat drug-resistant microbes. This study evaluated the photodynamic effects mediated by aloe emodin (AE), a natural compound isolated from Aloe vera and Rheum palmatum, on azole-sensitive and azole-resistant C. albicans in vitro. AE exhibited no significant dark toxicity, but in the presence of light effectively inactivated C. albicans cells in a concentration-dependent manner. The uptake of AE in fungal cells was investigated by confocal laser scanning microscopy (CLSM), and the results showed that AE possessed stronger ability to enter into C. albicans cells following light irradiation. Transmission electron microscopy analysis suggested that AE-mediated aPDT could induced damage to the cell wall, cytoplasm, and nucleus. Damage on the surface of C. albicans was observed by scanning electron microscopy. These results suggest that AE is a potential PS for use in aPDT of drug-resistant C. albicans strains, and AE-mediated aPDT shows promise as an antifungal treatment.

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Article information


Submitted
24 Aug 2019
Accepted
04 Mar 2020
First published
05 Mar 2020

Photochem. Photobiol. Sci., 2020, Accepted Manuscript
Article type
Paper

The effects of aloe emodin-mediated antimicrobial photodynamic therapy on drug-sensitive and resistant Candida albicans

W. Ma, C. Liu, J. Li, M. Hao, Y. Ji and X. Zeng, Photochem. Photobiol. Sci., 2020, Accepted Manuscript , DOI: 10.1039/C9PP00352E

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