New Methylene Blue-mediated Photodynamic Inactivation of Multidrug-resistant Fonsecaea Nubica Infected Chromoblastomycosis in Vitro

Overview

Journal Braz J Microbiol

Specialty Microbiology

Date 2023 May 5

PMID 37145297

Authors

Mengxue Zheng

Xiaoqing Zhou

Jiayin Pang

Zengjun Yang

Yongzhen Zou

Lian Zhang

Yan Xu

Rui Yin

Affiliations

Soon will be listed here.

Abstract

Chromoblastomycosis is a fungal disease presented with local warty papule, plaque, and verrucous nodules. In addition, the incidence and drug resistance of chromoblastomycosis are increasing each year worldwide. Photodynamic therapy is a promising method to treat mycoses. The purpose of this study was to evaluate the effect of new methylene blue (NMB)-induced PDT on multidrug-resistant chromoblastomycosis in vitro. We isolated one wild-type strain pathogen from one clinical patient diagnosed with chromoblastomycosis for over 27 years. The pathogen was identified by histopathology, the morphology of fungal culture, and genetic testing. Drug susceptibility testing was performed on the isolate. It was cultured with logarithmic growth phase spore in vitro and incubated with different concentrations of NMB for 30 min, and received illumination by red light-emitted diode with different light doses. After photodynamic treatment, the scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were conducted. The pathogen was Fonsecaea nubica, and it was resistant to itraconazole, terbinafine, amphotericin B, voriconazole andcaspofungin. At the same NMB concentration, the sterilization efficiency of NMB-photodynamic therapy (PDT) on F. nubica increased with increasing light intensity; F. nubica was completely killed at 25 µmol/L NMB with a light dose of 40 J/cm or 50 µmol/L NMB and light doses of ≥ 30 J/cm. SEM and TEM observed ultrastructural changes after PDT. NMB-PDT inactivates the survival of multidrug-resistant F. nubica in vitro; it therefore has the potential to become an alternative or adjuvant treatment for refractory chromoblastomycosis.

Citing Articles

Photoinactivation of microorganisms using bacteriochlorins as photosensitizers.

da Cruz Rodrigues A, Bilha J, Pereira P, de Souza C, Passarini M, Uliana M Braz J Microbiol. 2024; 55(2):1139-1150.

PMID: 38378880 PMC: 11153405. DOI: 10.1007/s42770-024-01278-1.

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