双特异性抗体参与者用于癌症免疫治疗
Hidde Ploegh1, Xin Liu1, Camille Le Gall2
1Boston Children's Hospital.
Research square
|August 16, 2024
概括
针对CTLA-4或PD-L1的两种特异性抗体吸引剂通过招募多种抗体来表现出强大的抗瘤活性. 加强PD-L1与药物或激动剂的接触显著提高了疗效,提供了一种新的免疫检查点阻塞策略.
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:
- 双特异性抗体参与者是工程融合蛋白.
- 它们将向免疫球蛋白卡帕光链的纳米体与向CTLA-4或PD-L1.1的纳米体结合在一起.
- 目前的免疫检查点封锁通常使用单个同型的单克隆抗体.
研究的目的:
- 为了评估双特异抗体参与者的抗瘤活性.
- 研究涉及多克隆免疫球蛋白招募的作用机制.
- 探索提高这些参与者的有效性策略.
主要方法:
- 构建针对免疫球蛋白卡帕轻链和CTLA-4或PD-L1.1的两种特异性抗体诱导剂.
- 在结直肠癌的MC38小鼠模型中评估抗瘤活性.
- 通过与细胞毒药物 (梅坦辛) 或STING激动剂结合增强疗效的评估.
主要成果:
- 抗CTLA-4联合体在MC38模型中显示出显著的瘤根除和减少调节性T细胞.
- 抗PD-L1联合体的疗效较低,但表现优于具有相似特异性的抗体.
- 抗PD-L1结合物的效力在使用坦辛或STING激动剂时大大增加.
结论:
- 双特异性抗体激活剂可以通过激活多克隆性免疫球蛋白引起强烈的抗瘤反应.
- 在所有免疫球蛋白同型中引入Fc介导功能,为免疫检查点阻塞提供了一个有希望的方法.
- 药物结合或STING激动症可以显著提高PD-L1针对双特定参与者的治疗潜力.
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