改变β细胞抗原暴露于耗尽的CD8+T细胞可以预防小鼠自身免疫糖尿病
David J De George1,2, Gaurang Jhala1,2, Claudia Selck1,2
1Immunology and Diabetes Unit, St Vincent's Institute, Fitzroy, Victoria, Australia.
Journal of immunology (Baltimore, Md. : 1950)
|April 8, 2024
概括
在自身免疫性糖尿病中准T细胞枯竭显示出有前途. 操纵抗原暴露可以减少终极耗尽 (TEX) 细胞或诱导功能疲劳,这两者都导致小鼠模型中的糖尿病保护.
科学领域:
- 免疫学 免疫学 免疫学
- 内分泌学 在内分泌学.
- 这是一种自身免疫力.
背景情况:
- 自免疫糖尿病涉及胰腺β细胞的慢性T细胞破坏.
- 功能障碍的状态,即T细胞耗尽,与糖尿病病变发生有关.
- 对抗原 (Ag) 的暴露对耗尽的T细胞的发展和分化至关重要.
研究的目的:
- 为了研究操纵β细胞抗原呈现以准耗尽的自身反应性T细胞.
- 评估抑制IFN-γ介导的MHC类I上调的对T细胞耗尽和糖尿病的影响.
- 评估异位贝塔细胞抗原 (IGRP) 表达对T细胞耗尽和糖尿病保护的影响.
主要方法:
- 使用NOD8.3小鼠模型对自身免疫糖尿病.
- 通过抑制IFN-γ介导的MHC I类上调来操纵β细胞抗原呈现.
- 在NOD.TII/8.3小鼠中,在MHCII类促进剂下异位表达的β细胞抗原IGRP在NOD.TII/8.3小鼠中.
- 对细胞毒性标志物 (granzyme B,CD107a) 的分析小岛PD-1+TIM3+CD8+ (终极耗尽的[TEX]) 细胞.
主要成果:
- 失去了IFN-γ介导的MHC类I上调,减少了岛屿TEX细胞,并保护了糖尿病.
- 宫外IGRP表达导致功能耗尽的TEX细胞增加,而大酶B的减少.
- 这些操纵与NOD8.3和NOD.TII/8.3小鼠的糖尿病保护相关.
- 介质抗原暴露允许T细胞在没有功能损害的情况下进入衰竭.
结论:
- 抗原暴露可以战略性地操纵以向自身免疫糖尿病中的细胞毒性T细胞.
- 限制细胞毒性TIM3+细胞的产生或驱动TEX细胞的功能耗尽,可以保护糖尿病.
- 这些发现突出了通过调节T细胞耗尽来治疗自身免疫性糖尿病的新治疗策略.
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