慢性炎症组织中辅助 B 细胞的 T 细胞。

T Cells That Help B Cells in Chronically Inflamed Tissues.

机构信息

Division of Rheumatology, Immunology, Allergy, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, United States.

出版信息

Front Immunol. 2018 Aug 23;9:1924. doi: 10.3389/fimmu.2018.01924. eCollection 2018.

Abstract

Chronically inflamed tissues commonly accrue lymphocyte aggregates that facilitate local T cell-B cell interactions. These aggregates can range from small, loosely arranged lymphocyte clusters to large, organized ectopic lymphoid structures. In some cases, ectopic lymphoid structures develop germinal centers that house prototypical T follicular helper (Tfh) cells with high expression of Bcl6, CXCR5, PD-1, and ICOS. However, in many chronically inflamed tissues, the T cells that interact with B cells show substantial differences from Tfh cells in their surface phenotypes, migratory capacity, and transcriptional regulation. This review discusses observations from multiple diseases and models in which tissue-infiltrating T cells produce factors associated with B cell help, including IL-21 and the B cell chemoattractant CXCL13, yet vary dramatically in their resemblance to Tfh cells. Particular attention is given to the PD-1 CXCR5 Bcl6 T peripheral helper (Tph) cell population in rheumatoid arthritis, which infiltrates inflamed synovium through expression of chemokine receptors such as CCR2 and augments synovial B cell responses via CXCL13 and IL-21. The factors that regulate CD4 T cell production of CXCL13 and IL-21 in these settings are also discussed. Understanding the range of T cell populations that can provide help to B cells within chronically inflamed tissues is essential to recognize these cells in diverse inflammatory conditions and to optimize either broad or selective therapeutic targeting of B cell-helper T cells.

摘要

慢性炎症组织通常会积累淋巴细胞聚集物,从而促进局部 T 细胞-B 细胞相互作用。这些聚集物的大小范围从小而松散排列的淋巴细胞簇到大而有组织的异位淋巴样结构。在某些情况下,异位淋巴样结构会形成生发中心,其中包含高表达 Bcl6、CXCR5、PD-1 和 ICOS 的典型滤泡辅助 T 细胞(Tfh)。然而,在许多慢性炎症组织中,与 B 细胞相互作用的 T 细胞在其表面表型、迁移能力和转录调控方面与 Tfh 细胞有很大的不同。本综述讨论了来自多种疾病和模型的观察结果,这些疾病和模型中组织浸润的 T 细胞产生与 B 细胞辅助相关的因子,包括 IL-21 和 B 细胞趋化因子 CXCL13,但与 Tfh 细胞的相似性差异很大。特别关注类风湿关节炎中浸润炎症滑膜的 PD-1 CXCR5 Bcl6 T 外周辅助(Tph)细胞群,该细胞通过表达趋化因子受体(如 CCR2)浸润炎症滑膜,并通过 CXCL13 和 IL-21 增强滑膜 B 细胞反应。还讨论了这些情况下调节 CD4 T 细胞产生 CXCL13 和 IL-21 的因素。了解在慢性炎症组织中能够为 B 细胞提供帮助的 T 细胞群体的范围对于在不同的炎症条件下识别这些细胞以及优化 B 细胞辅助 T 细胞的广泛或选择性治疗靶向至关重要。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4319/6115497/f02b5f46d806/fimmu-09-01924-g0001.jpg

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