Induction of natural IgE by glucocorticoids.

Induction of natural IgE by glucocorticoids.
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DOI:
10.1084/jem.20220903
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发表时间:
2022-10-03
期刊:
The Journal of experimental medicine
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本研究表明,糖皮质激素促进IgE的产生罕见的B细胞在肠系膜淋巴结中的实验施用抗原的情况下。IgE通过包被肥大细胞或嗜碱性粒细胞表面并在结合特异性过敏原后诱导脱粒来介导过敏反应。IgE也可以在没有外来过敏原的情况下自发产生;然而这种“天然”IgE的起源、调节和功能仍然在很大程度上未知。在这里,我们发现,糖皮质激素增强生产的IgE在B细胞在体内和体外没有抗原的挑战。这种IgE产生由B细胞内在糖皮质激素受体信号传导促进,该信号传导增强CD 40信号传导并与IL-4/STAT 6途径协同作用。此外,我们发现肠系膜淋巴结中罕见的B细胞负责产生糖皮质激素诱导的IgE。此外,肠道中局部产生的糖皮质激素可能在肠道稳态扰动(如生态失调)期间诱导天然IgE。值得注意的是,预先用糖皮质激素治疗的小鼠被保护免于随后的致病性过敏反应。总之,我们的研究结果表明,糖皮质激素,传统上被认为是广泛的免疫抑制,在B细胞中具有选择性免疫刺激作用。
The present study reveals that glucocorticoids promote the production of IgE by rare B cells in the mesenteric lymph nodes in the absence of experimentally administered antigens. IgE mediates allergic responses by coating mast cell or basophil surfaces and inducing degranulation upon binding a specific allergen. IgE can also be spontaneously produced in the absence of foreign allergens; yet the origin, regulation, and functions of such “natural” IgE still remain largely unknown. Here, we find that glucocorticoids enhance the production of IgE in B cells both in vivo and ex vivo without antigenic challenge. Such IgE production is promoted by B cell–intrinsic glucocorticoid receptor signaling that reinforces CD40 signaling and synergizes with the IL-4/STAT6 pathway. In addition, we found that rare B cells in the mesenteric lymph nodes are responsible for the production of glucocorticoid-inducible IgE. Furthermore, locally produced glucocorticoids in the gut may induce natural IgE during perturbations of gut homeostasis, such as dysbiosis. Notably, mice preemptively treated with glucocorticoids were protected from subsequent pathogenic anaphylaxis. Together, our results suggest that glucocorticoids, classically considered to be broadly immunosuppressive, have a selective immunostimulatory role in B cells.
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