Structural basis for the killing of human beta cells by CD8(+) T cells in type 1 diabetes.

Structural basis for the killing of human beta cells by CD8(+) T cells in type 1 diabetes.
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1型糖尿病中CD8(+)T细胞杀死人β细胞的结构基础。

DOI:
10.1038/ni.2206
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发表时间:
2012-01-15
期刊:
影响因子:
30.5
通讯作者:
--
中科院分区:
医学1区
文献类型:
--
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主要组织相容性(MHC)II类限制性自身抗原的自身反应性T细胞受体(TCR)接合的结构特征已经建立,但自身免疫性TCR如何与自身MHC I类相互作用尚不清楚。我们研究了CD 8 + T细胞如何通过自身反应性TCR(1 E6)识别HLA-A*0201限制性葡萄糖敏感性前胰岛素原肽来杀死1型糖尿病患者的胰岛β细胞。刚性的“锁和钥匙”结合支持1 E6-HLA-A*0201-肽相互作用,由此1 E6类似地对接到大多数MHCI限制性TCR。然而,由于与MHCI的接触有限,这种相互作用非常弱。TCR结合是高度以肽为中心的,在肽MHCI(pMHCI)上由两个CDR 3环编码的残基主导,充当“芳香帽”。因此,与次优TCR-pMHCI结合亲和力相关的高度集中的肽中心相互作用可能导致胸腺逃逸和潜在的CD 8 + T细胞介导的自身反应性。
The structural characteristics of autoreactive-T cell receptor (TCR) engagement of major histocompatability (MHC) class II-restricted self-antigens is established, but how autoimmune-TCRs interact with self-MHC class I has been unclear. We examined how CD8+ T cells kill human islet β-cells, in Type-1 diabetes, via autoreactive-TCR (1E6) recognition of an HLA-A*0201-restricted glucose-sensitive preproinsulin peptide. Rigid ‘lock-and-key’ binding underpinned the 1E6-HLA-A*0201-peptide interaction, whereby 1E6 docked similarly to most MHCI-restricted TCRs. However, this interaction was extraordinarily weak, due to limited contacts with MHCI. TCR binding was highly peptide-centric, dominated by two CDR3-loop-encoded residues, acting as an ‘aromatic-cap’, over the peptide MHCI (pMHCI). Thus, highly focused peptide-centric interactions associated with suboptimal TCR-pMHCI binding affinities might lead to thymic escape and potential CD8+ T cell-mediated autoreactivity.
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