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工程人类多能干细胞系,以规避异源移植障碍

Hannah A Pizzato¹, Paula Alonso-Guallart², James Woods²

¹Department of Immunobiology, University of Arizona College of Medicine, Tucson, AZ 85724, USA.

Stem cell reports

|January 12, 2024

概括

为了防止人类多能干细胞 (hPSC) 衍生疗法的拒绝,T细胞,自然杀手 (NK) 细胞和补充逃避是必不可少的. 对hPSCs的基因改造可以克服免疫障碍,使移植成功.

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
再生医学是一种再生医学.

背景情况:

源自人类多能干细胞 (hPSC) 的全基性疗法面临着接受者的免疫排斥.
克服免疫障碍对于基于hPSC的治疗的临床成功至关重要.

研究的目的:

为了设计具有增强免疫逃避特性的hPSCs.
确定负责拒绝hPSC移植的特定免疫组件.
为测试hPSC免疫性开发临床前模型.

主要方法:

在hPSC中基因切除基因 (β2M,TAP1,CIITA,CD74,MICA,MICB) 降低HLA-I,HLA-II和NK细胞激活配体的表达.
工程 hPSCs 来表达免疫抑制因子 (Qa1,H2-K^b,CD55,克里,CD59).
将移植的修改hPSC移植到免疫能力和免疫缺陷的小鼠模型中.

主要成果:

工程化hPSCs的移植导致野生类型小鼠的持续性瘤,表明免疫逃避成功.
缺乏HLA表达的hPSCs在缺乏补体和NK细胞的小鼠中持续存在,进一步支持免疫逃避.
确定T细胞,NK细胞和补充介导反应是hPSC移植的关键障碍.

结论:

针对T细胞,NK细胞和补体的综合性免疫规避策略是成功的全源hPSC移植所必需的.
表达免疫逃避因子的转基因hPSC可以作为研究免疫障碍的宝贵工具.
这些发现有助于在免疫能力模型中对hPSC衍生疗法的临床前测试.

关键词:

在T细胞,T细胞.移植移植移植移植补充补充补充补充补充补充补充.人类多能干细胞自然杀手细胞是自然杀手细胞.拒绝拒绝拒绝拒绝

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