Interaction Between Tfh/Tfr Ratio and Regulatory B Cell in Autoimmune Diseases.

Abstract

The balance between follicular helper T cells (Tfh) and follicular regulatory T cells (Tfr) is crucial for maintaining immune tolerance. Tfh cells are key in producing autoantibodies by providing essential help to germinal center (GC) B cells, while Tfr cells prevent autoimmune inflammatory processes by controling Tfh responses. However, the signals that regulate Tfh and Tfr cells are largely unknown. Due to dysregulated Tfr/Tfh balance and autoantibody production, regulatory B cells (Bregs) have emerged as a key checkpoint in the GC response. Bregs are B cells with immunosuppressive capabilities. Significant advancements have been made in understanding the roles of Bregs, particularly their capacity to produce cytokines with anti-inflammatory properties and regulate Th17, Th1, and regulatory T cells (Tregs) in the context of autoimmune conditions. Bregs also play a pivotal role in shaping the development, regulation, and localization of Tfh and Tfr cells within the immune environment. Consequently, gaining mechanistic knowledge about the interactions between Tfh-Bregs and Tfr-Bregs has the potential to establish homeostasis and suppress the development of autoantibodies in a various disorders. Within the context of autoimmune disorders, this article provides a concise summary of the dysregulation of Tfh/Tfr, highlighting the critical role of Bregs in regulating this balance. The previously unrecognized interplay between Bregs and Tfh/Tfr cells will serve as an essential basis for the comprehension and management of autoimmune illnesses. It also promises to offer invaluable knowledge of the biological mechanisms of autoantibody synthesis.