联合阻断TIGIT和PVRIG 使用一种新型双特异抗体增强抗瘤免疫力
Molecular cancer therapeutics
|January 24, 2025
概括
一种针对T细胞免疫受体的新型双特异性抗体,具有免疫球蛋白和免疫受体氨酸基抑制动机域 (TIGIT) 和与脊髓灰质炎受体相关的免疫球蛋白域 (PVRIG),通过增强T细胞激活和抗瘤免疫力,对癌症免疫疗法显示出希望.
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 T 细胞免疫接收器与免疫球蛋白和免疫接收器基于氨酸的抑制动机域 (TIGIT) 和与脊髓灰质炎受体相关的免疫球蛋白域 (PVRIG) 在T细胞和NK细胞上共同表达,有助于瘤免疫逃避.
- 同时阻断TIGIT和PVRIG是一个有希望的策略,可以提高癌症免疫疗法的疗效.
- 在各种癌症的瘤透淋巴细胞中观察到TIGIT和PVRIG的表达,包括非小细胞肺癌和结直肠癌.
研究的目的:
- 开发和表征一种双特异性抗体 (BsAb),旨在共同准TIGIT和PVRIG免疫检查点.
- 在临床前癌症模型中评估这种双重向BsAb的治疗潜力.
主要方法:
- 通过将抗PVRIG纳米体与抗TIGIT抗体融合,设计了一个BsAb.
- 评估了癌症患者瘤透淋巴细胞的TIGIT和PVRIG表达.
- 进行了体外和体外功能表征,包括T和NK细胞激活,细胞毒性测定,以及在Cynomolgus子中进行的药理动力/安全性研究.
主要成果:
- BsAb有效地阻止了TIGIT和PVRIG与它们的配体 (CD155和CD112) 的相互作用,显著增加了T细胞激活 (2.8倍) 和NK细胞细胞毒性 (1.8倍).
- 在临床前模型中表现出强大的抗瘤活性,无论是单一治疗还是与抗PD-1/PD-L1疗法结合治疗.
- 在Cynomolgus子中表现出有利的药理动力学特征,没有剂量限制性毒性.
结论:
- 开发的针对TIGIT-PVRIG轴的两种特异性抗体在增强抗瘤免疫力方面显示出显著的临床前疗效.
- 这种双重准的方法对癌症免疫疗法具有治疗前景.
- 需要进一步的临床研究来验证该BSAb的安全性和有效性.
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