Antigen-driven clonal proliferation of B cells within the target tissue of an autoimmune disease. The salivary glands of patients with Sjögren's syndrome.

Antigen-driven clonal proliferation of B cells within the target tissue of an autoimmune disease. The salivary glands of patients with Sjögren's syndrome.
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自身免疫性疾病靶组织内抗原驱动的 B 细胞克隆增殖。干燥综合征患者的唾液腺。

DOI:
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发表时间:
1998
影响因子:
15.9
通讯作者:
C. Berek
C. Berek
中科院分区:
医学1区
文献类型:
--
作者:
D. Stott;F. Hiepe;M. Hummel;G. Steinhauser;C. Berek

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在Sjögren综合征患者的唾液腺中可见类似生发中心的结构,但尚不清楚这些细胞簇的微环境是否足以诱导生发中心反应。因此,我们克隆并测序了从两名Sjögren综合征患者的唇唾液腺活检切片中分离的B细胞表达的重排Ig V基因。在一个细胞簇内重排的B细胞V基因是多克隆的,大多数有很少的体细胞突变。来自另一名患者的两个相邻集群各包含一个显性B细胞克隆,表达超突变的V基因。在这两个簇中都没有发现重排的V基因,这表明细胞无法迁移到周围的组织中并形成新的簇。框架和互补性决定区域中替代突变与沉默突变的比率表明抗原选择是高亲和力突变。这些结果表明,抗原驱动的生发中心型B细胞反应正在Sjögren综合征患者的唾液腺内发生。鉴于最近在类风湿滑膜内的生发中心反应以及在其他自身免疫性疾病的靶组织中存在类似的结构,我们提出生发中心型反应可以在多种自身免疫性疾病的非淋巴靶组织中诱导。
Structures resembling germinal centers are seen in the salivary glands of patients with Sjögren's syndrome, but it is not known whether the microenvironment of these cell clusters is sufficient for the induction of a germinal center response. Therefore, we cloned and sequenced rearranged Ig V genes expressed by B cells isolated from sections of labial salivary gland biopsies from two Sjögren's syndrome patients. Rearranged V genes from B cells within one cell cluster were polyclonal and most had few somatic mutations. Two adjacent clusters from another patient each contained one dominant B cell clone expressing hypermutated V genes. None of the rearranged V genes was found in both clusters, suggesting that cells are unable to migrate out into the surrounding tissue and seed new clusters. The ratios of replacement to silent mutations in the framework and complementarity determining regions suggest antigen selection of high-affinity mutants. These results show that an antigen-driven, germinal center-type B cell response is taking place within the salivary glands of Sjögren's syndrome patients. In view of the recent demonstration of a germinal center response within the rheumatoid synovial membrane and the existence of similar structures in the target tissues of other autoimmune diseases, we propose that germinal center- type responses can be induced in the nonlymphoid target tissues of a variety of autoimmune diseases.
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