Abstract
In rheumatoid arthritis (RA), immune homeostasis is maintained by T regulatory cells (Tregs) that in an inflammatory milieu can change towards T-helper-like phenotypes (Th-like Tregs). Our aim was to examine the phenotypic and functional characteristics of CD4+CD25+CD127lo/− Tregs, Th-like Tregs and T effector (Teff) cells in the peripheral blood (PB) and synovial fluid (SF) of treatment-naïve early RA, as compared to osteoarthritis (OA) and healthy control (HC) peripheral blood. Frequencies of Tregs, CXCR3, CCR6 expressing Tregs (Th-like Tregs), and Teff cells were analyzed using flow cytometry in RA (n = 80), OA (n = 20), and HC (n = 40). Cytokine concentrations of the respective T cell subsets in plasma and SF were measured using flow cytometric bead array. Tregs sorted from RA and HC PB using magnetic beads were analyzed for functional capacities by CFSE proliferation assay and FOXP3 gene expression using real-time PCR. We observed that the frequencies of Th17 cells in PB and SF were significantly higher in RA when compared to HC, whereas Tregs were lower in PB and high in SF compared to HC and OA respectively. Th1- and Th17-related pro-inflammatory cytokines IL12p70, INF-γ, TNF-α, and IL-6, and IL-17A were significantly higher in the plasma and SF of RA. Tregs expressing CXCR3 (Th1-like Tregs) and CCR6 (Th17-like Treg) were significantly higher in PB and SF of RA compared to controls and was positively associated with seropositivity and disease activity. Treg cells isolated from peripheral blood of RA showed decreased function and reduced FOXP3 gene expression compared to HC. In our study, we have demonstrated higher frequencies of Th1 and Th17 cells and increased circulatory and SF pro-inflammatory cytokines (IL12P70, INF-γ, IL-6, IL-17A, and TNF-α) in RA. This inflammatory milieu might alter total Tregs frequencies and influence conversion of Tregs into Th-like Tregs.
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Funding
The work was supported by Department of Science and Technology-Science and Engineering Research Board (DST-SERB), India (SERB/F/0253/2016–17), and JIPMER Intramural Research Fund (JIP/Res/Intra-PhD/01/2014–15 and JIP/Res/Intra-PhD/O2/2015–16).
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VSN, KV, and CMM contributed to the conception and the design of the study. VSN and CKG recruited patients and collected clinical data. KV performed experiments, analyzed the data, and drafted the manuscript. SNB was involved in experiments and statistical analyses. MTT, CMM, CKG, and PBN contributed to interpretation of the data, carefully read the article, and suggested edits. VSN, CMM, and MTT critically revised the article for important intellectual content. All authors agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
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The study was approved by the JIPMER institute ethics committee and conducted the following Principles of the Declaration of Helsinki (1964) and its later amendments or comparable ethical standards. Protocol No. JIP/IEC/2014/10/483 dated 30.01.2015.
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Kommoju, V., Mariaselvam, C.M., Bulusu, S.N. et al. Conventional Tregs in treatment-naïve rheumatoid arthritis are deficient in suppressive function with an increase in percentage of CXCR3 and CCR6 expressing Tregs. Immunol Res (2023). https://doi.org/10.1007/s12026-023-09444-7
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DOI: https://doi.org/10.1007/s12026-023-09444-7