Germline TRAV5D-4 T-cell receptor sequence targets a primary insulin peptide of NOD mice.

Germline TRAV5D-4 T-cell receptor sequence targets a primary insulin peptide of NOD mice.
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DOI:
10.2337/db11-1113
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发表时间:
2012-04
期刊:
影响因子:
7.7
通讯作者:
Eisenbarth GS
Eisenbarth GS
中科院分区:
医学1区
文献类型:
--
作者:
Nakayama M;Castoe T;Sosinowski T;He X;Johnson K;Haskins K;Vignali DA;Gapin L;Pollock D;Eisenbarth GS

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越来越多的证据表明,胰岛素 B 链肽、氨基酸 9-23(胰岛素 B:9-23)的自身免疫是 NOD 小鼠模型自身免疫性糖尿病发展的核心。我们假设,自身免疫性糖尿病的易感性增强是由种系中通常编码的 T 细胞受体 (TCR) 序列靶向胰岛素的结果。在本研究中,我们旨在通过研究表达具有不同 Vα TRAV 基因的 α 链的逆转录小鼠系,证明具有多个连接序列的特定 Vα 基因 TRAV5D-4 足以诱导抗胰岛自身免疫。表达具有许多不同互补决定区 (CDR) 3 序列的 Vα TRAV5D-4 α 链的逆转录 NOD 菌株,甚至是那些源自识别胰岛无关分子的 TCR 的菌株,都产生了抗胰岛素自身免疫。 TRAV5D-4 α 链诱导的胰岛素自身抗体因胰岛素肽 B:9-23 或 TRAV5D-4 CDR1 和 2 中两个氨基酸残基的突变而被取消。 TRAV13-1 是鼠 TRAV5D-4 的人类直系同源物,当与不同的鼠 CDR3 序列组合时,也能够诱导体内抗胰岛素自身免疫。通过简单的种系编码的 TCR 基序靶向初级自身抗原肽可能会增加自身免疫性糖尿病的易感性。
There is accumulating evidence that autoimmunity to insulin B chain peptide, amino acids 9–23 (insulin B:9–23), is central to development of autoimmune diabetes of the NOD mouse model. We hypothesized that enhanced susceptibility to autoimmune diabetes is the result of targeting of insulin by a T-cell receptor (TCR) sequence commonly encoded in the germline. In this study, we aimed to demonstrate that a particular Vα gene TRAV5D-4 with multiple junction sequences is sufficient to induce anti-islet autoimmunity by studying retrogenic mouse lines expressing α-chains with different Vα TRAV genes. Retrogenic NOD strains expressing Vα TRAV5D-4 α-chains with many different complementarity determining region (CDR) 3 sequences, even those derived from TCRs recognizing islet-irrelevant molecules, developed anti-insulin autoimmunity. Induction of insulin autoantibodies by TRAV5D-4 α-chains was abrogated by the mutation of insulin peptide B:9–23 or that of two amino acid residues in CDR1 and 2 of the TRAV5D-4. TRAV13–1, the human ortholog of murine TRAV5D-4, was also capable of inducing in vivo anti-insulin autoimmunity when combined with different murine CDR3 sequences. Targeting primary autoantigenic peptides by simple germline-encoded TCR motifs may underlie enhanced susceptibility to the development of autoimmune diabetes.
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