IgG4 autoantibodies induce dermal-epidermal separation.

IgG4 autoantibodies induce dermal-epidermal separation.
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DOI:
10.1111/j.1582-4934.2007.00081.x
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发表时间:
2007-09
影响因子:
5.3
通讯作者:
Sitaru C
Sitaru C
中科院分区:
医学2区
文献类型:
--
作者:
Mihai S;Chiriac MT;Herrero-González JE;Goodall M;Jefferis R;Savage CO;Zillikens D;Sitaru C

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大疱性类天疱疮(BP)是一种表皮下自身免疫性水疱性疾病,与真皮-表皮连接处(DEJ)的自身抗体相关。患者的自身抗体在与人皮肤冷冻切片和健康志愿者的白细胞共孵育时诱导真皮-表皮分离。IgG自身抗体触发补体和/或白细胞活化,导致几种自身免疫性疾病中的特定病理学。在这些疾病中,IgG 1和IgG 3同种型,而不是IgG 4亚类,被认为触发炎症途径,导致组织损伤。IgG 4自身抗体介导组织损伤的能力尚未得到证实。在这项研究中,我们从大疱性类天疱疮患者的血清中分离出IgG 1和IgG 4自身抗体,并在我们的冷冻切片试验中分析了它们诱导水疱的潜力。正如预期的那样,补体固定IgG 1自身抗体在该实验模型中诱导表皮下分裂。纯化的IgG 4不固定补体,但有趣的是,像IgG 1一样,激活白细胞并诱导真皮-表皮分离。IgG 4自身抗体诱导Fc依赖性真皮-表皮分离的潜力显著低于IgG 1。我们的研究结果表明,IgG 4自身抗体能够激活白细胞,并指出迄今为止较少认识到的IgG 4的功能。此外,我们第一次清楚地证明BP IgG 4自身抗体具有诱导白细胞依赖性组织损伤的能力。
Bullous pemphigoid (BP) is a sub-epidermal autoimmune blistering disease associated with autoantibodies to the dermal–epidermal junction (DEJ). Patients’ autoantibodies induce dermal–epidermal separation when co-incubated with cryosections of human skin and leucocytes from healthy volunteers. IgG autoantibodies trigger complement and/or leucocyte activation resulting in specific pathology in several autoimmune conditions. In these diseases, IgG1 and IgG3 isotypes, but not the IgG4 subclass, are thought to trigger inflammatory pathways resulting in tissue damage. The capacity of IgG4 autoantibodies to mediate tissue damage has not yet been demonstrated. In this study, we isolated IgG1 and IgG4 autoantibodies from bullous pemhigoid patients'serum and analysed their blister-inducing potential in our cryosection assay. As expected, complement-fixing IgG1 autoantibodies induced sub-epidermal splits in this experimental model. Purified IgG4 did not fix complement, but, interestingly, like IgG1, activated leucocytes and induced dermal–epidermal separation. The potential of IgG4 autoantibodies to induce Fc-dependent dermal–epidermal separation was significantly lower compared to IgG1. Our results demonstrate that IgG4 autoantibodies are able to activate leucocytes and point to a hitherto less recognized function of IgG4. Moreover, for the first time, we clearly demonstrate that BP IgG4 autoantibodies have the capacity to induce leucocyte-dependent tissue damage.
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发表时间: 2006-04-01
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