Immune Tolerance to Apoptotic Self Is Mediated Primarily by Regulatory B1a Cells.

Immune Tolerance to Apoptotic Self Is Mediated Primarily by Regulatory B1a Cells.
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对凋亡自我的免疫耐受性主要由调节性B1A细胞介导。

DOI:
10.3389/fimmu.2017.01952
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发表时间:
2017
影响因子:
7.3
通讯作者:
Gray M
Gray M
中科院分区:
医学2区
文献类型:
--
作者:
Miles K;Simpson J;Brown S;Cowan G;Gray D;Gray M

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慢性自身免疫性炎症性疾病,系统性红斑狼疮和干燥综合征,发展时,耐受凋亡细胞(AC)的损失。我们以前曾报道,这种耐受性是由先天性的IL-10分泌调节B细胞维持的。还有两个问题。首先,这些调节性B细胞是否主要属于稳态B细胞的一个子集;其次,它们的特异性是什么?我们在此报告,具有B1 a细胞特征性标志物的先天性B细胞(CD 43 + veCD 19 hiCD 5 +veIgMhiIgDlo)占脾细胞的80%和腹膜B细胞的96%,这些细胞通过分泌IL-10对AC作出反应。AC应答B1 a细胞分泌自身反应性天然抗体(NAb)和IL-10,其通过toll样受体(TLR)7或TLR 9刺激而增强。在这样做的过程中,它们都加速了巨噬细胞对垂死细胞的清除,并抑制了它们产生促炎免疫反应的潜力。虽然B1 a细胞与AC长时间接触,但它们不需要TIM 1或补体来介导其调节功能。在神经炎症(实验性自身免疫性脑脊髓炎)的动物模型中,仅105个活化的B1 a B细胞就足以抑制炎症。活化的B1 a B细胞还诱导抗原特异性T细胞分泌IL-10。因此,调节性B1 a细胞特异性识别并通过IL-10和NAb增强对凋亡自身的耐受性;但一旦激活,也可以预防自身免疫介导的炎症。
The chronic autoimmune inflammatory diseases, systemic lupus erythematosus and Sjogren’s syndrome, develop when tolerance to apoptotic cells (ACs) is lost. We have previously reported that this tolerance is maintained by innate-like, IL-10 secreting regulatory B cells. Two questions remained. First, do these regulatory B cells belong predominantly to a single subset of steady-state B cells and second, what is their specificity? We report here that innate-like B cells with markers characteristic for B1a cells (CD43+veCD19hiCD5+veIgMhiIgDlo) constitute 80% of splenic and 96% of peritoneal B cells that respond to ACs by secreting IL-10. AC responsive B1a cells secrete self-reactive natural antibodies (NAbs) and IL-10, which is augmented by toll-like receptor (TLR) 7 or TLR9 stimulation. In so doing, they both accelerate the clearance of dying cells by macrophages and inhibit their potential to mount proinflammatory immune responses. While B1a cells make prolonged contact with ACs, they do not require TIM1 or complement to mediate their regulatory function. In an animal model of neural inflammation (experimental autoimmune encephalomyelitis), just 105 activated B1a B cells was sufficient to restrain inflammation. Activated B1a B cells also induced antigen-specific T cells to secrete IL-10. Hence, regulatory B1a cells specifically recognize and augment tolerance to apoptotic self via IL-10 and NAbs; but once activated, can also prevent autoimmune mediated inflammation.
与凋亡相关决定因素的IgM抗体募集C1Q并增强凋亡细胞的树突状细胞吞噬作用。
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