Most Highly Cytokinergic IgEs Have Polyreactivity to Autoantigens.

Most Highly Cytokinergic IgEs Have Polyreactivity to Autoantigens.
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DOI:
10.4168/aair.2012.4.6.332
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发表时间:
2012-11
期刊:
Allergy, asthma & immunology research
影响因子:
--
通讯作者:
Kawakami T
Kawakami T
中科院分区:
其他
文献类型:
--
作者:
Kashiwakura J;Okayama Y;Furue M;Kabashima K;Shimada S;Ra C;Siraganian RP;Kawakami Y;Kawakami T

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当单体 IgE 分子与高亲和力受体结合时,其诱导肥大细胞存活促进和细胞因子产生的能力表现出巨大的异质性。在这一范围的一端,高细胞因子能 (HC) IgE 可以诱导有效的存活促进、脱粒、细胞因子产生、迁移等,而在另一端,低细胞因子能 (PC) IgE 则效率低下。在本研究中,我们研究了 IgE 是否识别自身抗原以及 IgE 与自身抗原的结合是否与 HC 与 PC 特性的差异相关。进行酶联免疫吸附测定来测试 IgE 是否结合抗原。通过蛋白质印迹法对人血清中的组胺释放因子进行定量。使用源自人脐带血的培养肥大细胞来测试人血清对细胞因子产生的影响。大多数(7/8)小鼠单克隆 HC IgE 对双链 DNA (dsDNA)、单链 DNA (ssDNA)、β-半乳糖苷酶、甲状腺球蛋白和/或组胺释放因子表现出多反应性。相比之下,小鼠 PC IgE 未能与这些抗原发生反应。人单克隆 HC IgE 还表现出对组胺释放因子、dsDNA 和 ssDNA 的多反应性。有趣的是,特应性皮炎患者的血清显示出对 ssDNA 和 β-半乳糖苷酶的反应性增加,并且组胺释放因子的水平增加。一些特应性皮炎患者(而非健康个体)血清中 HRF 反应性 IgE 水平较高。来自具有高滴度 DNA 反应性 IgE 的特应性皮炎患者的血清可以诱导人类肥大细胞中 IL-8 的分泌量比健康个体的血清多几倍。结果表明,大多数 HC(而非 PC)IgE 对自身抗原表现出多反应性,支持特应性皮炎发病机制中的自身免疫机制。
Monomeric IgE molecules, when bound to the high-affinity receptor, exhibit a vast heterogeneity in their ability to induce survival promotion and cytokine production in mast cells. At one end of this spectrum, highly cytokinergic (HC) IgEs can induce potent survival promotion, degranulation, cytokine production, migration, etc., whereas at the other end, poorly cytokinergic (PC) IgEs can do so inefficiently. In this study, we investigated whether IgEs recognize autoantigens and whether IgEs' binding of autoantigens correlates with difference s in HC versus PC properties. Enzyme-linked immunosorbent assays were performed to test whether IgEs bind antigens. Histamine-releasing factor in human sera was quantified by western blotting. Cultured mast cells derived from human cord blood were used to test the effects of human sera on cytokine production. Most (7/8) of mouse monoclonal HC IgEs exhibited polyreactivity to double-stranded DNA (dsDNA), single-stranded DNA (ssDNA), β-galactosidase, thyroglobulin and/or histamine-releasing factor. By contrast, mouse PC IgEs failed to react with these antigens. A human monoclonal HC IgE also showed polyreactivity to histamine-releasing factor, dsDNA and ssDNA. Interestingly, sera from atopic dermatitis patients showed increased reactivity to ssDNA and β-galactosidase and increased levels of histamine-releasing factor. Some atopic dermatitis patients, but not healthy individuals, had substantial serum levels of HRF-reactive IgE. Sera from atopic dermatitis patients with high titers of DNA-reactive IgE could induce several fold more IL-8 secretion in human mast cells than sera from healthy individuals. The results show that most HC, but not PC, IgEs exhibit polyreactivity to autoantigens, supporting the autoimmune mechanism in the pathogenesis of atopic dermatitis.
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