Selective dysregulation of the FcgammaIIB receptor on memory B cells in SLE.

Selective dysregulation of the FcgammaIIB receptor on memory B cells in SLE.
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DOI:
10.1084/jem.20051503
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发表时间:
2006-09-04
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Diamond B
Diamond B
中科院分区:
其他
文献类型:
--
作者:
Mackay M;Stanevsky A;Wang T;Aranow C;Li M;Koenig S;Ravetch JV;Diamond B

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自身反应性记忆B细胞和浆母细胞的不适当扩增和激活有助于系统性红斑狼疮(SLE)自身耐受性的丧失。在几种SLE小鼠模型中,抑制性Fc受体FcγRIIB的缺陷已被证明有助于B细胞活化和自身免疫。在这篇论文中,我们证明了FcγRIIB的表达在健康对照外周血中的记忆B细胞上常规地上调,而在SLE患者的记忆B细胞中FcγRIIB的上调显著降低。这与这些B细胞中Fcγ RIIB介导的B细胞受体诱导的钙(Ca 2+)反应抑制降低直接相关。我们还发现,在未能上调FcγRIIB的患者中,非洲裔美国患者的比例过高。这些结果表明,抑制性受体FcγRIIB可能在SLE中调节记忆B细胞的关键检查点受损;因此,FcγRIIB代表了该疾病治疗干预的新靶点。
The inappropriate expansion and activation of autoreactive memory B cells and plasmablasts contributes to loss of self-tolerance in systemic lupus erythematosus (SLE). Defects in the inhibitory Fc receptor, FcγRIIB, have been shown to contribute to B cell activation and autoimmunity in several mouse models of SLE. In this paper, we demonstrate that expression of FcγRIIB is routinely up-regulated on memory B cells in the peripheral blood of healthy controls, whereas up-regulation of FcγRIIB is considerably decreased in memory B cells of SLE patients. This directly correlates with decreased FcγRIIB-mediated suppression of B cell receptor–induced calcium (Ca2+) response in those B cells. We also found substantial overrepresentation of African-American patients among those who failed to up-regulate FcγRIIB. These results suggest that the inhibitory receptor, FcγRIIB, may be impaired at a critical checkpoint in SLE in the regulation of memory B cells; thus, FcγRIIB represents a novel target for therapeutic interventions in this disease.
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