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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Depletion of regulatoryT cells in ongoing paracoccidioidomycosis rescues protective Thl/Th17 immunity and prevents fatal disease outcome

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Galdino, Nayane A. L. [1] ; Loures, V, Flavio ; de Araujo, Eliseu F. [1] ; da Costa, Tania A. [1] ; Preite, Nycolas W. [1] ; Calich, Vera Lucia G. [1]
Total Authors: 6
[1] Univ Sao Paulo, Inst Ciencias Biomed, Dept Imunol, Sao Paulo, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 8, NOV 8 2018.
Web of Science Citations: 1

In human paracoccidioidomycosis (PCM), a primary fungal infection typically diagnosed when the disease is already established, regulatoryT cells (Treg) cells are associated with disease severity. Experimental studies in pulmonary PCM confirmed the detrimental role of these cells, but in most studies, Tregs were depleted prior to or early during infection. These facts led us to study the effects of Treg cell depletion using a model of ongoing PCM. Therefore, Treg cell depletion was achieved by treatment of transgenic C57BL/6(DTR/eGFP) (DEREG) mice with diphtheria toxin (DT) after 3 weeks of intratracheal infection with 1 x 10(6) Paracoccidioides brasiliensis yeasts. At weeks 6 and 10 post infection, DT-treated DEREG mice showed a reduced number of Treg cells associated with decreased fungal burdens in the lungs, liver and spleen, reduced tissue pathology and mortality. Additionally, an increased influx of activated CD4(+) and CD8(+) T cells into the lungs and elevated production of Thl/ Th17 cytokines was observed in DT-treated mice. Altogether, our data demonstrate for the first time that Treg cell depletion in ongoing PCM rescues infected hosts from progressive and potentially fatal PCM; furthermore, our data indicate that controlling Treg cells could be explored as a novel immunotherapeutic procedure. (AU)

FAPESP's process: 13/23536-3 - The role of the NALP3 inflammasome in pulmonary Paracoccidioidomycosis
Grantee:Vera Lucia Garcia Calich
Support Opportunities: Regular Research Grants
FAPESP's process: 17/20799-4 - Modulation of immune response by aryl hydrocarbon receptor ligands in the search for an immunotherapeutic procedure for pulmonary Paracoccidioidomycosis
Grantee:Nycolas Willian Preite
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 16/23189-0 - Modulation of Treg/Th17 responses by Aryl Hydrocarbon Receptor Ligands in the Search for an Immunotherapeutic Procedure for Pulmonary Paracoccidioidomycosis
Grantee:Vera Lucia Garcia Calich
Support Opportunities: Regular Research Grants
FAPESP's process: 14/18668-0 - The importance of aryl hydrocarbon receptor (AhR) in the regulation of immune response and host resistance to pulmonary paracoccidioidomycosis
Support Opportunities: Scholarships in Brazil - Post-Doctoral