通过T细胞介导的Beta-2-微型球蛋白免疫排斥 淘汰赛诱导 多能干细胞衍生的脏器官
Lonneke H Gaykema1,2, Rianne Y van Nieuwland1, Ellen Lievers1
1Department of Internal Medicine (Nephrology) & Einthoven Laboratory of Vascular and Regenerative Medicine, Leiden University Medical Center (LUMC), Leiden, The Netherlands.
Stem cells translational medicine
|October 16, 2023
概括
基因改造脏器官去除人类白细胞抗原 (HLA) 类I并没有防止体内免疫排斥. 针对HLAII类是成功移植这些工程器官的关键.
科学领域:
- 再生医学是一种再生医学.
- 免疫学 免疫学 免疫学
- 干细胞生物学 干细胞生物学
背景情况:
- 诱导多能干细胞 (iPSC) 衍生器官具有移植的潜力.
- 免疫排斥仍然是临床应用的重大障碍.
- 人类白细胞抗原 (HLA) I类表达是免疫逃避的关键目标.
研究的目的:
- 为了研究淘汰β-2-微型血球蛋白 (B2M) 消除HLA I类表达在器官的有效性.
- 评估B2M淘汰对体外和体内T细胞中介排斥的影响.
- 为了确定单独的B2M淘汰是否足以在移植脏器官中进行免疫逃避.
主要方法:
- 使用CRISPR-Cas9基因编辑来创建B2M淘汰赛iPSCs.
- 脏器官与野生类型和B2M淘汰赛iPSC有所区分.
- 进行了体外T细胞测试.
- 器官被移植到人性化的小鼠体内,并植入了外周血液单核细胞 (PBMC).
- 分析了免疫细胞透,增殖和细胞毒性.
主要成果:
- B2M淘汰成功地消除了HLA I类脏器官的表面表达.
- 在体外,B2M淘汰器官被保护免受T细胞排斥.
- 在体内,B2M淘汰并没有阻止T细胞透,增殖或细胞毒性.
- 控制和B2M淘汰器官都表现出组织损伤和损害完整性的情况.
- HLAII类表达存在于控制和B2M淘汰器官,包括上皮细胞.
结论:
- 导致HLA类I丢失的B2M淘汰,不足以防止T细胞介导的IPSC衍生的器官的免疫排斥.
- 在有机细胞上先前存在的HLAII类表达是一种额外的免疫障碍.
- 调节HLAII类信号是成功移植工程器官的必要条件.
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