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人体干细胞衍生β细胞表达优化的CD155减少细胞毒性免疫细胞功能,适用于1型糖尿病

Matthew E Brown^1,2, Jessie M Barra^1,3, Marcus R Pina^1,2

¹Diabetes Institute, University of Florida, Gainesville, FL, USA.

bioRxiv : the preprint server for biology

|August 20, 2025

概括

具有高亲和度CD155的工程干细胞衍生β细胞 (sBC) 减少免疫攻击,为1型糖尿病 (T1D) 提供了有前途的新疗法. 这种方法增强了免疫逃避,改善了潜在的恢复性治疗的sBC生存率.

科学领域:

免疫学免疫学免疫学
干细胞生物学干细胞生物学
内分泌学在内分泌学.

背景情况:

1型糖尿病 (T1D) 治疗面临着供体短缺和β细胞替代疗法的免疫拒绝等挑战.
来自干细胞的β细胞 (sBC) 提供了一种可再生的来源,但易受免疫破坏的影响.

研究的目的:

设计人类多能干细胞以表达免疫检查点抑制剂CD155.5的高亲和度突变 (Mut) 变体.
评估修改后的sBC能够逃避由T细胞和NK细胞介导的免疫攻击的能力.

主要方法:

人类多能干细胞被设计为表达野生型 (WT) 或高亲和度突变 (Mut) CD155.5.
修改后的细胞分化为sBC,并通过共同培养研究评估它们的免疫相互作用.
使用TIGIT阻塞证实了CD155-TIGIT信号在免疫逃避中的作用.

主要成果:

CD155 Mut-表达的sBC显示了上调的CD155和增强的带结合.
CD155 Mut sBC通过参与TIGIT抑制了CD8+T细胞和NK细胞的激活和增殖.
表达CD155 Mut的sBC显示自身反应性免疫细胞的破坏减少和较低的细胞毒性分子分泌.

结论:

高亲和度CD155表达通过利用CD155-TIGIT抑制途径来增强sBC的免疫逃避.
这种工程化免疫逃避机制提高了sBC在1型糖尿病的治疗潜力.
准CD155-TIGIT信号传递是一种新的策略,可以保护β细胞疗法免受免疫攻击.

关键词:

CD155 是一个CD155 是一个CD155 这是一个紧张的紧张.1 型糖尿病 1 型糖尿病这是自身免疫力.来自干细胞的β类细胞.

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