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López-Ramírez, Luz A; Martínez-Álvarez, José A; Martínez-Duncker, Iván; Lozoya-Pérez, Nancy E; Mora-Montes, Héctor M
Journal of fungi (Basel), 2024-Apr-23, Letnik: 10, Številka: 5Journal Article
is one of the etiological agents of sporotrichosis, a cutaneous and subcutaneous infection distributed worldwide. Like other medically relevant fungi, its cell wall is a molecular scaffold to display virulence factors, such as protective pigments, hydrolytic enzymes, and adhesins. Cell wall proteins with adhesive properties have been previously reported, but only a handful of them have been identified and characterized. One of them is Gp70, an abundant cell wall protein mainly found on the surface of yeast-like cells. Since the protein also has a role in the activity of 3-carboxy- , -muconate cyclase and its abundance is low in highly virulent strains, its role in the -host interaction remains unclear. Here, a set of -silenced strains was generated, and the molecular and phenotypical characterization was performed. The results showed that mutants with high silencing levels showed a significant reduction in the adhesion to laminin and fibrinogen, enzyme activity, and defects in the cell wall composition, which included reduced mannose, rhamnose, and protein content, accompanied by an increment in β-1,3-glucans levels. The cell wall -linked glycan content was significantly reduced. These strains induced poor TNFα and IL-6 levels when interacting with human peripheral blood mononuclear cells in a dectin-1-, TLR2-, and TLR4-dependent stimulation. The IL-1β and IL-10 levels were significantly higher and were stimulated via dectin-1. Phagocytosis and stimulation of neutrophil extracellular traps by human granulocytes were increased in highly -silenced strains. Furthermore, these mutants showed virulence attenuation in the invertebrate model . Our results demonstrate that Gp70 is a versatile protein with adhesin properties, is responsible for the activity of 3-carboxy- , -muconate cyclase, and is relevant for the -host interaction.
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