低免疫性HLA-E单链抑制全反应性免疫反应
Colby R Maldini1, Lindsey J Coholan1, Cisem Karaca1
1Beam Therapeutics, Cambridge, MA.
Journal of immunology (Baltimore, Md. : 1950)
|December 2, 2024
概括
工程T细胞通过破坏HLA类I并表达一种新的HLA-E受体来逃避免疫排斥. 这种方法增强了仿真抗原受体T细胞的持久性和在异种移植中的治疗潜力.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞疗法细胞疗法
- 分子工程分子工程分子工程
背景情况:
- 全基化化学抗原受体 (CAR) T细胞面临受体的免疫排斥,限制了它们的有效性.
- 受体免疫反应,特别是来自CD8+ T细胞和NK细胞的免疫反应,可以减少CAR T细胞的持久性.
- 需要策略来克服免疫障碍,以实现通用捐赠CAR T细胞疗法.
研究的目的:
- 为了设计抗免疫性CAR T细胞,抵抗受体免疫排斥.
- 增强全原CAR T细胞的体内持久性和治疗疗效.
- 开发一种新的基于HLA-E的单链受体,以恢复NK细胞的耐受性.
主要方法:
- 通过破坏β-2微型血球蛋白,产生HLA类I缺乏T细胞.
- 工程T细胞表达一种二硫化陷HLA-E4 (dtHLA-E4) 分子,用于NK细胞的耐受性.
- 纳入dTHLA-E4分子的α-3域的突变,以减少CD8+T细胞的识别.
主要成果:
- 优化的dTHLA-E4分子显示表面表达增加和增强NK细胞抑制.
- dtHLA-E4取消了CD8依赖的T细胞识别,同时保留了NK细胞的抑制功能.
- 来自HLA-A和HLA-C全型的可以最大限度地抑制NK细胞,并最大限度地减少NKG2C+NK细胞的激活.
结论:
- 一种低免疫性dTHLA-E4分子的系统构造成功降低了T细胞免疫性.
- 这种工程化CAR T细胞策略克服了NK细胞的"失踪自我"识别.
- 开发的低免疫性CAR T细胞显示出在全基环境中改善持久性的前景.
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