Abstract
Pigments produced by micro-organisms could contribute to their pathogenesis and resistance. The investigation into the red pigment of R. mucilaginosa and its ability to survive and resist has not yet been explored. This study aimed to investigate the survival and resistance of the R. mucilaginosa CQMU1 strain following inhibition of pigment production by naftifine and its underlying mechanism. The red-pigmented Rhodotorula mucilaginosa CQMU1 yeast was isolated from an infected toenail of a patient with onychomycosis. Cultivation of R. mucilaginosa in liquid and solid medium showed the effect of naftifine after treatment. Then, analysis of phagocytosis and tolerance to heat or chemicals of R. mucilaginosa was used to evaluate the survival and resistance of yeast to different treatments. Naftifine reversibly inhibited the pigmentation of R. mucilaginosa CQMU1 in solid and liquid media. Depigmented R. mucilaginosa CQMU1 showed increased susceptibility toward murine macrophage cells RAW264.7 and reduced resistance toward different types of chemicals, such as 1.5-M NaCl and 0.5% Congo red. Inhibition of pigment production by naftifine affected the survival and growth of R. mucilaginosa and its resistance to heat and certain chemicals. The results obtained could further elucidate the target of new mycosis treatment.
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Acknowledgements
We are grateful to The first Affiliated Hospital of Chongqing Medical University for providing the clinical isolates and laboratory equipment.
Funding
This research was funded by Chongqing Research Program of Basic Research and Frontier Technology [Grant No. cstc2021jcyj-msxmX0158], and Scientific and Technological Research Program of Chongqing Municipal Education Commission [Grant No. KJQN202113201]. The funding bodies had no role in the design of the study and collection, analysis, and interpretation of data and in writing the manuscript.
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NFBI performed the experiments (lead), analyzed the data (lead), and wrote the original draft of the manuscript (lead). QJ (supporting) and HL (supporting) conducted sampling and sample identification, and YG (supporting) and WY provided assistance in the purchase of chemicals (lead) and culture media preparation (supporting). H provided assistance with the generation of graphical data (supporting) and manuscript editing. TZ designed the study (lead) and supervised the work (lead) and was responsible for conceptualization (lead), data curation (lead), funding acquisition (lead), and methodology formulation (lead). All authors have read and agreed to the published version of the manuscript.
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The Ethics Committee of Chongqing Medical University has approved this study as reference number 2020211 and the approval was given on 10th October 2020.
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The patient of Chongqing Medical University has given the consent to participate in this study as approved by the Ethics Committee of Chongqing Medical University given on 10th October 2020 with reference number 2020011.
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The Ethics Committee of Chongqing Medical University has approved this study as reference number 2020211 and the data obtained can be published in this journal.
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Idris, N.F.B., Jia, Q., Lu, H. et al. Reduced Survival and Resistance of Rhodotorula mucilaginosa Following Inhibition of Pigment Production by Naftifine. Curr Microbiol 80, 285 (2023). https://doi.org/10.1007/s00284-023-03388-9
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DOI: https://doi.org/10.1007/s00284-023-03388-9