Abstract
It is well documented that disturbance of cell surface by some agents triggers compensatory responses aimed to maintain the cell wall integrity in fungi and other organisms. Here, the thermodimorphic fungus Sporothrix globosa, a member of the pathogenic clade of the Sporothrix complex, was propagated in yeast–peptone–dextrose medium under conditions to obtain the mycelium (pH 4.5, 27–28 °C) or the yeast (pH 7.8, 32–34 °C) morphotypes in the absence and presence of the wall-interacting dyes Congo Red (CR) and Calcofluor White (CFW) either alone or in combination. After different periods of time, growth, cell morphology and activity of glucosamine-6-phosphate synthase (GlcN-6-P synthase), an ubiquitous enzyme that plays a crucial role in cell wall biogenesis, were determined. CR and to a lower extent CFW affected growth and morphology of both fungal morphotypes and significantly increased enzyme activity. Notoriously, CR or CR in combination with CFW induced the transient conversion of yeasts into conidia-forming filamentous cells even under culture conditions adjusted for yeast development, most likely as a strategy to evade the noxious effect of the dye. After sometime, hypha returned to yeast cells. An hypothetical model to explain the effect of CR on morphology and enzyme activity based on the possible role of membrane-spanning proteins known as mechanosensors is proposed. Results are discussed in terms of the fungal responses to cell wall damage.
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Acknowledgements
Thanks are given to Dr. Arturo Vega González, Dr. Julio C. Villagómez-Castro, Q.F.B. Lilia Maritza Almanza Villegas and M.C. Carmen Sánchez Leyva, all from Universidad de Guanajuato, for their help in the statistics analysis (AVG), epifluorescence microscopy (JCVC) and expert technical assistance (LMAV, CSL).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Jorge A. Ortiz Ramírez. Mayra Cuéllar-Cruz and Everardo López-Romero wrote the manuscript. All authors read and approved the final manuscript.
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Ortiz-Ramírez, J.A., Cuéllar-Cruz, M. & López-Romero, E. Responses of Sporothrix globosa to the cell wall perturbing agents Congo Red and Calcofluor White. Antonie van Leeuwenhoek 114, 609–624 (2021). https://doi.org/10.1007/s10482-021-01545-3
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DOI: https://doi.org/10.1007/s10482-021-01545-3