选择性向EGFR和其他广泛表达的瘤抗原的非门性T细胞
Julyun Oh1, Charles Kirsh1, Jing-Ping Hsin1
1A2 Biotherapeutics; 30301 Agoura Rd., Agoura Hills 91301, CA, USA.
iScience
|May 27, 2024
概括
一种新的非封闭细胞疗法 (Tmod) 针对EGFR和HLA-E等癌症抗原. 一种独特的"阻断剂"机制保护正常细胞,使得对固体瘤的CAR T细胞疗法更安全.
科学领域:
- 免疫学 免疫学 免疫学
- 在瘤学瘤学.
- 生物技术是生物技术.
背景情况:
- 化学抗原受体 (CAR) T细胞疗法显示出前景,但面临的挑战是针对瘤的毒性.
- 癌细胞经常表达抗原,如表皮生长因子受体 (EGFR) 和人类白细胞抗原-E (HLA-E).
- 制定减轻CAR T细胞毒性的策略,同时保持有效性,对于临床转化至关重要.
研究的目的:
- 开发一种新的非封闭细胞疗法 (Tmod),可以选择性地向表达特定抗原的癌细胞.
- 设计一个安全机制 ("阻断器") 以防止Tmod细胞损害健康组织.
- 在临床前模型中评估Tmod系统的有效性和安全性.
主要方法:
- 设计的Tmod结构针对与癌症相关的抗原EGFR和HLA-E.
- 包含一种由特定的HLA等位基因产物触发的抑制受体 ("阻断剂").
- 利用小鼠模型来评估Tmod疗效和毒性,包括体外移植对宿主反应.
- 研究了阻断器介导的CAR表面表达调制的机制.
主要成果:
- Tmod细胞有效地向表达EGFR和HLA-E的癌细胞.
- "阻断器"机制保护非癌细胞免受Tmod介导的细胞毒性.
- 在固体瘤中,瘤抗原的删除,通过失去了异性,激活了阻断剂.
- 与单独的CAR相比,Tmod构造在小鼠模型中显示出较低的毒性.
- 阻断剂控制了体外同源T细胞的移植对宿主反应.
结论:
- Tmod系统通过利用瘤特异性抗原表达和结合一种新的安全开关,为更安全的CAR T细胞疗法提供了一个潜在的战略.
- 通过HLA等位基删除触发的阻塞机制,提供了瘤选择性的优势,并减轻了瘤外毒性.
- 在不需要额外的基因编辑的情况下,Tmod细胞对现成的全基因细胞疗法充满了希望.
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