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REGULATION OF B-LYMPHOCYTE NEGATIVE AND POSITIVE SELECTION BY TYROSINE PHOSPHATASE CD45

机译:酪氨酸磷酸酶CD45对B淋巴细胞阴性和阳性选择的调节

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ELIMINATION of self-reactive B cells must be balanced against the need for B-cell diversity for antibody responses to pathogens. To analyse factors that determine the extent of B cell negative selection, we crossed CD45-deficient mice(1) with mice carrying immunoglobulin transgenes specific for hen egg lysozyme (HEL). CD45 positively regulates antigen-receptor signallingt(2-9) and CD45-deficient HEL-specific B cells gave diminished signalling in response to HEL. Significantly, few mature CD45(-/-) B cells accumulated, despite normal immature B-cell production. Circulating HEL autoantigen mediates negative selection of mature CD45(+/+) HEL binding B cells(10) but, in striking contrast, the autoantigen positively selected CD45(-/-) HEL-binding B cells, promoting their accumulation as long-lived IgD(hi) cells. These findings are consistent with a signal-threshold model for B-cell selection and demonstrate that changes in antigen receptor signalling can cause high-affinity self-reactive B cells to be actively retained instead of eliminated, thus revealing a potential mechanism for inherited susceptibility to autoimmune disease. [References: 27]
机译:消除自我反应性B细胞必须与针对病原体的抗体反应所需的B细胞多样性保持平衡。为了分析决定B细胞阴性选择程度的因素,我们将CD45缺陷小鼠(1)与携带对鸡蛋溶菌酶(HEL)具有特异性的免疫球蛋白转基因的小鼠杂交。 CD45阳性调节抗原受体信号(2-9)和缺乏CD45的HEL特异性B细胞响应HEL信号减少。值得注意的是,尽管正常的未成熟B细胞产生,但几乎没有积累成熟的CD45(-/-)B细胞。循环的HEL自身抗原介导了对成熟CD45(+ / +)HEL结合B细胞的负选择(10),但与此形成鲜明对比的是,自身抗原阳性选择了CD45(-/-)HEL结合B细胞,促进了它们的长寿命积累IgD(hi)细胞。这些发现与B细胞选择的信号阈值模型一致,并证明抗原受体信号传导的变化可导致高亲和力的自反应性B细胞被主动保留而不是被消除,从而揭示了遗传易感性的潜在机制。自身免疫性疾病。 [参考:27]

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