HLA-DR3 restricted environmental epitopes from the bacterium Clostridium tetani have T cell cross-reactivity to the SLE-related autoantigen SmD.

HLA-DR3 restricted environmental epitopes from the bacterium Clostridium tetani have T cell cross-reactivity to the SLE-related autoantigen SmD.
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DOI:
10.3389/fimmu.2022.928374
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发表时间:
2022
影响因子:
7.3
通讯作者:
Fu, Shu Man
Fu, Shu Man
中科院分区:
医学2区
文献类型:
--
作者:
Zhao, Zhenhuan;Anderson, Ashley N.;Kannapell, Carol C.;Kwok, William W.;Gaskin, Felicia;Fu, Shu Man

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HLA-DR 3(DR 3)是与系统性红斑狼疮(SLE)易感性相关的主要HLA-DR等位基因之一。我们先前的研究显示Smith D(SmD)蛋白中存在多个分子内DR 3限制性T细胞表位,由此我们产生了非同源的细菌表位模拟文库。从该文库中,我们鉴定ABC 247 -261 Mimic为来自破伤风梭菌中ABC转运蛋白ATP结合蛋白的一个新的DR 3限制性细菌T细胞表位。它激活并诱导自身反应性SmD 66 -80特异性T细胞,并在体内诱导针对狼疮相关自身抗原的自身抗体。与健康供体相比,SLE患者对ABC 247 -261 Mimic和SmD 66 -80的交叉反应性T细胞百分比更高。此外,我们分析了单个DR 3限制性破伤风类毒素(TT)T细胞表位诱导自身免疫T细胞的能力。我们发现,免疫显性TT表位TT 826 -845刺激SmD 66 -80反应性T细胞,但与ABC 247 -261模拟物相比,未能诱导持久的抗SmD自身抗体。因此,暴露于ABC 247 -261模拟表位可能有助于易感DR 3个体的自身免疫。
HLA-DR3 (DR3) is one of the dominant HLA-DR alleles associated with systemic lupus erythematosus (SLE) susceptibility. Our previous studies showed multiple intramolecular DR3 restricted T cell epitopes in the Smith D (SmD) protein, from which we generated a non-homologous, bacterial epitope mimics library. From this library we identified ABC247-261 Mimic as one new DR3 restricted bacterial T cell epitope from the ABC transporter ATP-binding protein in Clostridium tetani. It activated and induced autoreactive SmD66-80-specific T cells and induced autoantibodies to lupus-related autoantigens in vivo. Compared to healthy donors, SLE patients have a greater percentage of cross-reactive T cells to ABC247-261 Mimic and SmD66-80. In addition, we analyzed the ability of single DR3 restricted Tetanus toxoid (TT) T cell epitopes to induce autoimmune T cells. We found that the immunodominant TT epitope TT826-845 stimulated SmD66-80 reactive T cells but failed to induce persistent anti-SmD autoantibodies compared to the ABC247-261 Mimic. Thus, exposure to the ABC247-261 Mimic epitope may contribute to autoimmunity in susceptible DR3 individuals.
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