放射性免疫疗法 向B7-H3 in situ 质瘤模型通过重建瘤微环境来增强抗瘤功效
Meng Zheng1,2, Yan Wang1,2,3, Fengqing Fu3,4
1Department of Clinical Pharmacology, The First Affiliated Hospital of Soochow University, Suzhou, SZ, China.
International journal of biological sciences
|September 14, 2023
概括
一种新的放射性免疫治疗剂,I-hu4G4,针对B7-H3治疗质母细胞瘤. 它有效地抑制瘤生长,并通过提高免疫细胞活性,将"冷"瘤转化为"热".
科学领域:
- 在瘤学瘤学.
- 免疫学 免疫学 免疫学
- 放射化学 放射化学是指辐射化学.
背景情况:
- 放射性核酸药物联合体 (RDCs) 为癌症治疗提供了一个有前途的途径,特别是在质母细胞瘤等恶性瘤中.
- RDCs的有效性取决于选择最佳抗体以进行有针对性的输送.
- B7-H3 是一种重要的瘤标志物,存在于质母细胞瘤细胞上,使其成为新型治疗的可行标.
研究的目的:
- 开发和评估I-hu4G4,一种针对B7-H3的新型抗体-放射性核酸结合体,用于质母细胞瘤放射性免疫治疗.
- 评估I-hu4G4.1的结合亲和力,体外疗效和体内抗瘤活性.
- 调查I-hu4G4对瘤微环境和免疫反应的影响.
主要方法:
- 开发I-标记的hu4G4 (I-hu4G4),一种人性化的单克隆IgG1抗体,向人类B7-H3.
- 使用放射性联体结合试验 (Kd = 0.99 ± 0.07 nM) 评估与B7-H3的结合亲和力.
- 在GL261质瘤小鼠模型中,对U87质母细胞细胞中的体内细胞毒性和体内抗瘤活性进行了评估.
主要成果:
- 在实验室中,I-hu4G4表现出对B7-H3的特定高亲和度结合,并抑制了质母细胞瘤细胞的生长.
- 在临床前的质瘤模型中观察到显著的 in situ 抗瘤疗效.
- 该疗法重塑了瘤微环境,通过增加CD4+和CD8+T细胞透和促进M1巨细胞两极分化,将其从"冷"转变为"热".
结论:
- 通过直接的细胞毒性和免疫调节,I-hu4G4对质母细胞瘤表现出强烈的抗瘤活性.
- 改变瘤微环境的能力表明作用的双重机制,增强治疗潜力.
- 131I-hu4G4代表了质母细胞瘤放射性免疫治疗的有希望的候选人.
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