PMID- 37712561 OWN - NLM STAT- Publisher LR - 20231024 IS - 1473-6322 (Electronic) IS - 1473-6322 (Linking) VI - 23 IP - 6 DP - 2023 Dec 1 TI - Effects of allergen immunotherapy on follicular regulatory T cells. PG - 507-513 LID - 10.1097/ACI.0000000000000944 [doi] AB - PURPOSE OF REVIEW: Emerging evidence indicating that the dysfunction of T follicular regulatory (T FR ) cells contributes to excessive immunoglobulin E (IgE) production and the development of allergic diseases. Conversely, allergen immunotherapy (AIT) modulates T FR cells abundance and function to promote immune tolerance. This review focus on the role of T FR cells in allergic diseases and AIT, with the objective of providing novel insights into the mechanisms underlying immune tolerance of AIT and proposing the potential targeting of T FR cells in the context of allergic diseases. RECENT FINDINGS: Numerous studies have consistently demonstrated that T FR cells play a pivotal role in the inhibition of class switch recombination to IgE in both humans and specific murine models. This suppression is attributed to the actions of neuritin and IL-10 secreted by T FR cells, which exert direct and indirect effects on B cells. In patients with allergic rhinitis, reduced frequencies of circulating or tonsillar T FR cells have been reported, along with impaired functionality in suppressing IgE production. AIT, whether administered subcutaneously or sublingually, reinstates the frequency and functionality of T FR cells in allergic rhinitis patients, accompanied by changes of the chromatin accessibility of T FR cells. The increase in T FR cell frequency following AIT is associated with the amelioration of clinical symptoms. SUMMARY: T FR cells exert an inhibitory effect on IgE production and demonstrate a correlation with the clinical efficacy of AIT in patients with allergic rhinitis, suggesting T FR cells hold promise as a therapeutic target for allergic diseases and potential biomarker for AIT. CI - Copyright (c) 2023 Wolters Kluwer Health, Inc. All rights reserved. FAU - Sun, Shi-Ran AU - Sun SR AD - Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology. FAU - Yao, Yin AU - Yao Y AD - Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology. AD - Hubei Clinical Research Center for Nasal Inflammatory Diseases. AD - Institute of Allergy and Clinical Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China. FAU - Liu, Zheng AU - Liu Z AD - Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology. AD - Hubei Clinical Research Center for Nasal Inflammatory Diseases. AD - Institute of Allergy and Clinical Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China. LA - eng PT - Journal Article DEP - 20230915 PL - United States TA - Curr Opin Allergy Clin Immunol JT - Current opinion in allergy and clinical immunology JID - 100936359 SB - IM EDAT- 2023/09/15 12:43 MHDA- 2023/09/15 12:43 CRDT- 2023/09/15 07:43 PHST- 2023/09/15 12:43 [pubmed] PHST- 2023/09/15 12:43 [medline] PHST- 2023/09/15 07:43 [entrez] AID - 00130832-990000000-00084 [pii] AID - 10.1097/ACI.0000000000000944 [doi] PST - ppublish SO - Curr Opin Allergy Clin Immunol. 2023 Dec 1;23(6):507-513. doi: 10.1097/ACI.0000000000000944. Epub 2023 Sep 15.