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  • Title: Changes in the expression of T-cell factor-1 in follicular helper T cells reflect the condition of systemic lupus erythematosus patients.
    Author: Zeng X, Zheng M, Liu T, Bahabayi A, Kang R, Xu Q, Alimu X, Lu S, Song Y, Liu C.
    Journal: Int Immunopharmacol; 2022 Jul; 108():108877. PubMed ID: 35729844.
    Abstract:
    OBJECTIVE: This study aimed to identify changes in T-cell factor-1 (TCF1) in circulating T-cell subsets of systemic lupus erythematosus (SLE) patients and to explore their significance in SLE. METHODS: Peripheral blood was collected from 41 SLE patients and 45 healthy controls (HCs). TCF1 in follicular helper T (TFH), follicular regulatory T (TFR) and regulatory T (Treg) cells was analyzed by flow cytometry. Interleukin-21 (IL-21), programmed death receptor 1 (PD-1) and killer cell lectin-like receptor G1 (KLRG1) were detected and compared among TFH subsets sorted according to TCF1 and CD62L expression. Correlation analyses were conducted between TCF1-related TFH cell subsets and autoantibody levels, systemic lupus erythematosus disease activity index (SLEDAI), and plasmablast levels of SLE patients. RESULTS: Absolute numbers of TCF1- TFH and TCF1+ Treg cells were increased in SLE patients. According to TCF1 and CD62L expression, circulating TFH cells and Tregs were sorted into four subsets. CD62L+TCF1+ TFH cell percentages were decreased, and CD62L-TCF1- TFH cells were increased. CD62L+TCF1+ Treg cell percentages were increased, and CD62L-TCF1- Treg cell percentages were decreased. KLRG1+ percentages in CD62L-TCF1-TFH were higher in SLE patients than in HCs. Functionally, CD62L+TCF1+ TFH cells had stronger IL-21 secretion, while CD62L-TCF1-TFH cells had weaker IL-21 secretion and lower PD-1 expression. TCF1- and CD62L-TCF1- TFH numbers were positively correlated with anti-ribosomal P, anti-dsDNA and SLEDAI. CONCLUSION: The increased TFH cells in SLE patients were mostly TCF1-negative subsets with weakened function. Changes in TCF1-related subsets can reflect the condition and abnormal humoral immunity of SLE patients.
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