Abstract
The chromoblastomycosis is a subcutaneous mycosis with a high morbidity rate, Fonsecaea pedrosoi being the largest etiologic agent of this mycosis, usually confined to the skin and subcutaneous tissues. Rarely people get the cure, because the therapies shown to be deficient and few studies report the host–parasite relationship. Dendritic cells (DCs) are specialized in presenting antigens to naïve T lymphocytes inducing primary immune responses. Therefore, we propose to study the migratory capacity of DCs after infection with conidia of F. pedrosoi. The phenotype of DCs was evaluated using cells obtained from footpad and lymph nodes of BALB/c mice after 12, 24 and 72 h of infection. After 24 and 72 h of infection, we found a significant decrease in DCs in footpad and a significant increase in the lymph nodes after 72 h. The expression of surface markers and co-stimulatory molecules were reduced in cells obtained from footpad. To better assess the migratory capacity of DCs migration from footpad, CFSE-stained conidia were injected subcutaneously. We found that after 12 and 72 h, CD11c+ cells were increased in regional lymph nodes, leading us to believe that DCs (CD11c+) were able to phagocytic conidia present in footpad and migrated to regional lymph nodes.
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The present work was supported by FAPESP and Doctoral Fellowship from FAPESP.
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Telma Fátima Emidio Kimura and Lavínia Maria Dal’Mas Romera contributed equally to this work.
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11046_2020_429_MOESM1_ESM.tif
F. pedrosoi conidia influences the number of Ly6G+ cells in footpad and lymph nodes. BALB/c mice were infected subcutaneously on the footpad with F. pedrosoi conidia. After 12, 24 and 72 h of infection, total cells were obtained from footpad and lymph nodes were collected +. As control, mice were infected with PBS. Data were analyzed by software FlowJo and gating strategy (FSc–SSc cell analysis and Ly6G+). All data are representative as mean of three independent experiments (*p < 0.01, SD). One-way ANOVA test and Tukey’s multiple comparison test. (A and B) Analysis of Ly6G+ in footpad. (C and D) Analysis of Ly6G+ in lymph nodes (TIFF 513 kb)
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Kimura, T.F.E., Romera, L.M.D. & de Almeida, S.R. Fonsecaea pedrosoi Conidia Induces Activation of Dendritic Cells and Increases CD11c+ Cells in Regional Lymph Nodes During Experimental Chromoblastomycosis. Mycopathologia 185, 245–256 (2020). https://doi.org/10.1007/s11046-020-00429-w
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DOI: https://doi.org/10.1007/s11046-020-00429-w