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Dendritic Cells Promote Treg Expansion but Not Th17 Generation in Response to Talaromyces marneffei Yeast Cells

Authors Tang Y, Zhang H, Xu H, Zeng W, Qiu Y, Tan C, Tang S, Zhang J

Received 25 November 2019

Accepted for publication 25 February 2020

Published 11 March 2020 Volume 2020:13 Pages 805—813

DOI https://doi.org/10.2147/IDR.S239906

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Professor Suresh Antony


Yanping Tang,* Hui Zhang,* Haiguang Xu, Wen Zeng, Ye Qiu, Caimei Tan, Shudan Tang, Jianquan Zhang

Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, People’s Republic of China

*These authors contributed equally to this work

Correspondence: Jianquan Zhang
Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, People’s Republic of China
Tel/ Fax +86 7715350031
Email jqzhang2002@126.com

Background: Dendritic cells (DCs) with both proinflammatory and tolerogenic properties have been implicated in modulation of CD4+ T cell responses in many fungal diseases. However, the role of DC in the context of Talaromyces marneffei (T. marneffei) infection has not been determined. In this study, we aimed to study the effect of the yeast form of T. marneffei yeasts on DCs, as well as the role of DCs in modulating T helper 17 (Th17) and regulatory T (Treg) cell responses to the pathogen.
Methods: Mouse bone marrow-derived DCs were stimulated with T. marneffei yeasts for 24 h. Frequencies of CD80 and CD86 expression on DCs and the levels of IL-6, IL-10 and TGF-β in the culture supernatant of yeast-stimulated DCs were detected by flow cytometry and ELISA, respectively. In co-culture experiments, CD4+ T lymphocytes of mice were isolated from the spleen using magnetic beads and co-cultured with T. marneffei yeasts, with or without DCs for 24 h. The proportions of Th17 and Treg cells in co-culture were detected by flow cytometry. The mRNA levels of RORγt and Foxp3 were detected by RT-PCR. Levels of IL-10 and TGF-β in the co-culture supernatant were detected by ELISA.
Results: The expressions of CD80 and CD86 on DCs were increased, as well as IL-6, IL-10 and TGF-β levels in the culture supernatant of T. marneffei-stimulated DCs were higher than those in DCs cultured without T. marneffei. In co-culture experiments, in the presence of DCs, T. marneffei promoted Treg expansion and Foxp3 up-regulation but limited Th17 and downregulated RORγt. Levels of IL-10 and TGF-β were higher in the co-culture containing DCs than without DCs.
Conclusion: Our findings demonstrated that the interaction between DCs and T. marneffei could promote Treg expansion but not Th17 generation. These findings provide a mechanism by which DCs may promote immune tolerance in T. marneffei infection.

Keywords: dendritic cells, Talaromyces marneffei, Th17 cells,  Treg cells

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