对CD22分子的结合域有助于T细胞参与双特异性抗体的生物活性
Jie Chen1, Zhidi Pan1, Lei Han2
1Engineering Research Center of Cell and Therapeutic Antibody, Ministry of Education, School of Pharmacy, Shanghai Jiao Tong University, Shanghai, 200240, China.
Heliyon
|July 17, 2023
概括
通过考虑抗体狂热度和结合域,优化针对CD22的T细胞参与双特异性抗体 (TCBs) 显著提高了它们在治疗B细胞恶性瘤中的有效性. 这种方法改善了抗瘤活性,提供了一个有前途的治疗策略.
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:
- CD22是B细胞恶性瘤中的关键抗原,使其成为CAR-T细胞,ADC和免疫毒素等免疫治疗的目标.
- 针对CD22的抗体的激发和结合域被假设对免疫治疗的有效性产生重大影响.
- 参与T细胞的双特异性抗体 (TCBs) 通过参与T细胞以向癌细胞,为血液恶性瘤提供了潜在的治疗方法.
研究的目的:
- 研究抗体激烈度和结合域对向CD22的TCBs在癌症免疫治疗中的生物功能的影响.
- 产生和评估具有不同度和约束特性的CD22-TCB,以评估其治疗潜力.
- 确定CD22-TCB的最佳设计参数,以最大限度地提高B细胞恶性瘤中的抗瘤活性.
主要方法:
- 使用六个先前报告的CD22单克隆抗体 (mAbs) 生成CD22-TCBs,具有不同的激活度和向CD22蛋白的不同域.
- 评估了CD22-TCBs对CD22蛋白和细胞的性,将蛋白结合性与细胞结合性进行比较.
- 评估了TCB介导的细胞毒性,T细胞增殖,激活,细胞毒性和细胞因子释放 *in vitro*. 在体内研究中选择的主要候选物 (G5/44 BsAb).
- 在小鼠模型中评估选择的CD22-TCB (G5/44 BsAb) *in vivo*的抗瘤活性.
主要成果:
- CD22-TCBs对CD22蛋白的敏性与对细胞的敏性不一致,这表明有不同的结合方式.
- 在实验室中,TCB介导的细胞毒性取决于抗体对细胞的狂热度,而不是对蛋白质的狂热度.
- 发现CD22的远端结合域有助于IgG-[L]-scfv类CD22-TCBs的激发和生物活性.
- CD22-TCB (G5/44 BsAb) 在体内*显著抑制了瘤生长.
结论:
- 抗体的激烈性和结合域是针对B细胞恶性瘤有效的CD22向TCBs设计的关键因素.
- 优化CD22-TCB设计,考虑目标细胞的性和远端结合域相互作用,可以提高治疗疗效.
- CD22-TCBs,特别是G5/44 BsAb,代表了血液恶性瘤的有前途的治疗策略,需要进一步的临床开发.
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