PMID- 33098663 OWN - NLM STAT- MEDLINE DCOM- 20210514 LR - 20210514 IS - 1398-9995 (Electronic) IS - 0105-4538 (Linking) VI - 76 IP - 2 DP - 2021 Feb TI - Roles of follicular helper and regulatory T cells in allergic diseases and allergen immunotherapy. PG - 456-470 LID - 10.1111/all.14639 [doi] AB - Allergic diseases are characterized by overactive type 2 immune responses to allergens and immunoglobulin E (IgE)-mediated hypersensitivity. Emerging evidence suggests that follicular helper T (T(FH) ) cells, rather than type 2 T-helper (T(H) 2) cells, play a crucial role in controlling IgE production. However, follicular regulatory T (T(FR) ) cells, a specialized subset of regulatory T (T(REG) ) cells resident in B-cell follicles, restricts T(FH) cell-mediated help in extrafollicular antibody production, germinal center (GC) formation, immunoglobulin affinity maturation, and long-lived, high-affinity plasma and memory B-cell differentiation. In mouse models of allergic asthma and food allergy, CXCR5(+) T(FH) cells, not CXCR5(-) conventional T(H) 2 cells, are needed to support IgE production, otherwise exacerbated by CXCR5(+) T(FR) cell deletion. Upregulation of T(FH) cell activities, including a skewing toward type 2 T(FH) (T(FH) 2) and IL-13 producing T(FH) (T(FH) 13) phenotypes, and defects in T(FR) cells have been identified in patients with allergic diseases. Allergen immunotherapy (AIT) reinstates the balance between T(FH) and T(FR) cells in patients with allergic diseases, resulting in clinical benefits. Collectively, further understanding of T(FH) and T(FR) cells and their role in the immunopathogenesis of allergic diseases creates opportunities to develop novel therapeutic approaches. CI - (c) 2020 European Academy of Allergy and Clinical Immunology and John Wiley & Sons Ltd. 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, Wuhan, China. AD - The University of Queensland Diamantina Institute, Faculty of Medicine, The University of Queensland, Brisbane, Qld, Australia. FAU - Chen, Cai-Ling AU - Chen CL AD - Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China. FAU - Yu, Di AU - Yu D AD - The University of Queensland Diamantina Institute, Faculty of Medicine, The University of Queensland, Brisbane, Qld, Australia. FAU - Liu, Zheng AU - Liu Z AUID- ORCID: 0000-0002-4168-6702 AD - Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20201104 PL - Denmark TA - Allergy JT - Allergy JID - 7804028 SB - IM MH - Animals MH - B-Lymphocytes MH - Desensitization, Immunologic MH - Germinal Center MH - Humans MH - *Hypersensitivity/therapy MH - Mice MH - T-Lymphocytes, Helper-Inducer MH - *T-Lymphocytes, Regulatory OTO - NOTNLM OT - allergen immunotherapy OT - allergy OT - follicular helper T cell OT - follicular regulatory T cell OT - immunoglobulin E EDAT- 2020/10/25 06:00 MHDA- 2021/05/15 06:00 CRDT- 2020/10/24 17:05 PHST- 2020/07/09 00:00 [received] PHST- 2020/10/06 00:00 [revised] PHST- 2020/10/20 00:00 [accepted] PHST- 2020/10/25 06:00 [pubmed] PHST- 2021/05/15 06:00 [medline] PHST- 2020/10/24 17:05 [entrez] AID - 10.1111/all.14639 [doi] PST - ppublish SO - Allergy. 2021 Feb;76(2):456-470. doi: 10.1111/all.14639. Epub 2020 Nov 4.