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Kwon, Dong-Il; Park, Eun Seo; Kim, Mingyu; Choi, Yoon Ha; Lee, Myeong-Seok; Joo, Si-Hyung; Kang, Yeon-Woo; Lee, Minji; Jo, Saet-Byeol; Lee, Seung-Woo; Kim, Jong Kyoung; Lee, You Jeong
Nature communications, 03/2022, Letnik: 13, Številka: 1Journal Article
Increased serum levels of immunoglobulin E (IgE) is a risk factor for various diseases, including allergy and anaphylaxis. However, the source and ontogeny of B cells producing IgE under steady state conditions are not well defined. Here, we show plasma cells that develop in the thymus and potently secrete IgE and other immunoglobulins, including IgM, IgA, and IgG. The development of these IgE-secreting plasma cells are induced by IL-4 produced by invariant Natural Killer T cells, independent of CD1d-mediated interaction. Single-cell transcriptomics suggest the developmental landscape of thymic B cells, and the thymus supports development of transitional, mature, and memory B cells in addition to plasma cells. Furthermore, thymic plasma cells produce polyclonal antibodies without somatic hypermutation, indicating they develop via the extra-follicular pathway. Physiologically, thymic-derived IgEs increase the number of mast cells in the gut and skin, which correlates with the severity of anaphylaxis. Collectively, we define the ontogeny of thymic plasma cells and show that steady state thymus-derived IgEs regulate mast cell homeostasis, opening up new avenues for studying the genetic causes of allergic disorders.
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in: SICRIS
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