开发用于固体瘤治疗的PRAME pMHC向T细胞参与剂
Katarzyna Skrzypczynska1, Kristin Schimert2, Heather Stephenson3
1Oncology, Gilead Sciences, Inc, Foster City, CA, USA.
mAbs
|September 25, 2025
概括
研究人员确定了一种新的标,PRAMEPRAME425,用于双特异性T细胞参与剂 (TCE) 疗法. 这一发现使得选择性向固体瘤成为可能,同时最大限度地降低了瘤以外的毒性,为新的癌症治疗铺平了道路.
科学领域:
- 免疫学和癌症治疗学
- 分子生物学和结构生物学.
背景情况:
- 双特异性T细胞吸引剂 (TCE) 疗法在血液癌症中表现有前途,但由于抗原选择性有限,在固体瘤中面临挑战.
- 瘤相关的抗原在健康组织中表达,阻碍了TCE在固体瘤中的有效性.
研究的目的:
- 为了确定TCE治疗的高度瘤限制抗原,以克服固体瘤的选择性问题.
- 描述癌症试验抗原在黑色素瘤中优先表达的抗原 (PRAME) 和其呈现的PRAME425作为潜在的TCE标.
主要方法:
- 开发了一种TCR模拟 (TCRm) 抗体查级联,优先考虑T细胞依赖细胞细胞毒性测试,而不是传统的pMHC结合测试,以确定特异性.
- 发现抗PRAME425 pMHC TCRm抗体具有类似TCR的结合几何,通过冷电子显微镜证实了与PRAME425/HLA-A*02:01.01复合的抗体的结构.
- 将发现的TCRm抗体格式化为强大的TCE,以评估瘤细胞杀死功效.
主要成果:
- 确定了由MHCI提出的PRAME425,作为TCE开发的高度选择性瘤抗原.
- 发现了新的TCRm抗体,可以选择性地与PRAME425 pMHC结合,而无需显著的目标外识别.
- 使用开发的TCEs证明了PRAME425的pMHC特异性杀死瘤细胞.
结论:
- 在开发针对固体瘤的新型TCE方面,PRAME425 pMHC是一个有前途和高度选择性的目标.
- 开发的TCRm抗体和TCEs代表了针对癌症治疗的新一类生物药物,最大限度地减少了瘤外的影响.
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