基于纳米体的双特异性抗体吸引剂针对CTLA-4或PD-L1进行癌症免疫治疗
Xin Liu1, Camille Le Gall1, Ryan K Alexander1
1Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA.
Nature biomedical engineering
|July 16, 2025
概括
针对CTLA-4或PD-L1的新双特异性抗体吸引剂显示出强大的抗瘤活性. 这些新型免疫疗法招募了多克隆性免疫球蛋白,提高了癌症治疗常规抗体的疗效.
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:
- 免疫检查点阻塞 (ICB) 在有限的患者群体中提供了持久的反应.
- 迫切需要更有效的免疫疗法.
- 传统的ICB通常使用单个同型的单克隆抗体.
研究的目的:
- 开发用于增强癌症免疫治疗的新型两种特异性抗体.
- 研究针对CTLA-4和PD-L1.1的VHH-VHHkappa结合物的抗瘤活性和机制.
- 将这些新型抗体的疗效与传统单克隆抗体进行比较.
主要方法:
- 两种特异性融合蛋白的构建:纳米体向免疫球蛋白卡帕轻链 (VHHkappa) 融合到纳米体,对抗CTLA-4或PD-L1.
- 在小鼠模型中对抗瘤活性的体内评估,包括结直肠癌.
- 对内调节性T细胞种群的评估.
- 使用梅坦辛或STING激动剂增强抗PD-L1结合剂功效.
主要成果:
- 双特异性VHH-VHHkappa参与者通过招募多克隆性免疫球蛋白在小鼠中表现出强烈的抗瘤活性.
- 抗CTLA-4结合剂的性能优于传统的抗CTLA-4单克隆抗体和降低调控性T细胞.
- 抗PD-L1结合剂对传统抗体的疗效有所提高,其效力与细胞毒药物或STING激动剂进一步增强.
结论:
- 双特异性抗体吸引剂提供了一种有前途的策略,通过吸引所有免疫球蛋白同型的Fc介导功能来提高免疫疗法的疗效.
- 这些新型融合蛋白代表了当前免疫检查点阻塞疗法的潜在进步.
- 用VHH-VHHkappa结合物准CTLA-4和PD-L1为癌症治疗开发提供了一个多功能平台.
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