Tfh and Tfr Cells in Autoimmune Diseases

Year 2023, Volume: 6 Issue: 4, 735 - 739, 15.10.2023

Gulam Hekimoğlu , Nurullah Yücel , Muzaffer Şeker

https://doi.org/10.19127/bshealthscience.1298421

Abstract

An immunological condition known as autoimmunity causes the excessive generation of autoantibodies against self-antigen and is characterized by enhanced T-cell activation and extra-stimulated B-cells. The development of lymphatic follicle germinal centers (GCs), the maturation of B cells, and differentiation into plasma cells are all significantly aided by follicular helper T cells (Tfh). Tfh cells express the transcriptional regulator B cell lymphoma 6 (BCL-6), C-X-C chemokine receptor 5 (CXCR5), inducible T cell co-stimulator (ICOS), and programmed cell death protein 1 (PD-1). The production of interleukin (IL)-21 and low expression of the chemokine (C-C motif) receptor 7 (CCR7) define Tfh cells. Additionally, Tfh cells are a diverse population of cells with the potential to co-express minute quantities of transcription factors, such as T-box expressed in T cells (T-bet), GATA-binding protein 3 (GATA-3), and retinoic acid receptor-related orphan receptor (ROR-t). Tfh cells that also produce IL-21, IL-4, IL-17, and IFN-γ are referred to as Tfh1, Tfh2, and Tfh17 cells, respectively. The control of humoral immunity is carried out by follicular regulatory (Tfr) cells that express Forkhead box protein 3 (Foxp3). Tfr cells can, however, decrease T-B cell interactions through the cytotoxic T lymphocyte-associated protein 4 (CTLA-4) while promoting B cell maturation through IL-10. In the context of autoimmunity, the role of Tfh and Tfr cells is still not fully understood. We intend to present the most recent data on the characteristics and function of Tfh and Tfr cells under conditions of autoimmunity in this review.

Keywords

Tfh, Tfr, IL-21, Autoimmune disease

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