γδ T cells recognize the insulin B:9-23 peptide antigen when it is dimerized through thiol oxidation.

γδ T cells recognize the insulin B:9-23 peptide antigen when it is dimerized through thiol oxidation.
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DOI:
10.1016/j.molimm.2014.04.007
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发表时间:
2014-08
影响因子:
3.6
通讯作者:
Born WK
Born WK
中科院分区:
医学3区
文献类型:
--
作者:
Aydintug MK;Zhang L;Wang C;Liang D;Wands JM;Michels AW;Hirsch B;Day BJ;Zhang G;Sun D;Eisenbarth GS;O'Brien RL;Born WK

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胰岛素肽B:9-23是1型糖尿病(T1 D)的非肥胖糖尿病(NOD)小鼠模型中的天然抗原。除了αβ T细胞和B细胞之外,γδ T细胞识别肽并浸润胰岛,其中肽在β细胞内产生。该肽在位置19处含有半胱氨酸(Cys 19),其是γδ而不是αβ T细胞应答所需的,并且在位置16处含有酪氨酸(Tyr 16),其是两者所需的。与T细胞一起沿着测试的肽特异性mAb不需要两个氨基酸中的任何一个来结合B:9-23肽。我们发现γδ T细胞需要Cys 19,因为它们识别氧化状态的肽抗原,其中两个肽分子的Cys 19巯基形成二硫键,产生可溶性同源二聚体。相比之下,αβ T细胞将肽抗原识别为与MHCII分子I-Ag 7复合的还原单体。与非结构化单体B:9-23肽不同,γδ-刺激性同源二聚体在溶液中采用独特的二级结构,其不同于天然胰岛素分子的相应部分的二级结构。Tyr 16是二聚胰岛素肽的这种结构以及对它的γδ应答所必需的。这一观察结果与γδ T细胞识别依赖于二聚胰岛素B:9-23抗原的二级结构的观点一致。
The insulin peptide B:9-23 is a natural antigen in the non-obese diabetic (NOD) mouse model of type 1 diabetes (T1D). In addition to αβ T cells and B cells, γδ T cells recognize the peptide and infiltrate the pancreatic islets where the peptide is produced within β cells. The peptide contains a cysteine in position 19 (Cys19), which is required for the γδ but not the αβ T cell response, and a tyrosine in position 16 (Tyr16), which is required for both. A peptide-specific mAb, tested along with the T cells, required neither of the two amino acids to bind the B:9-23 peptide. We found that γδ T cells require Cys19 because they recognize the peptide antigen in an oxidized state, in which the Cys19 thiols of two peptide molecules form a disulfide bond, creating a soluble homo-dimer. In contrast, αβ T cells recognize the peptide antigen as a reduced monomer, in complex with the MHCII molecule I-Ag7. Unlike the unstructured monomeric B:9-23 peptide, the γδ-stimulatory homo-dimer adopts a distinct secondary structure in solution, which differs from the secondary structure of the corresponding portion of the native insulin molecule. Tyr16 is required for this adopted structure of the dimerized insulin peptide as well as for the γδ response to it. This observation is consistent with the notion that γδ T cell recognition depends on the secondary structure of the dimerized insulin B:9-23 antigen.
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