针对犬类免疫疗法模型:单克隆抗体具有针对TIM3的氧化还原调节表位,减弱了加列-9结合的作用
Jack Brydon1, Radovan Krejcir2, Mariana Grima3
1Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, Scotland, UK.
Analytical biochemistry
|December 17, 2025
概括
研究人员开发了针对狗的TIM3免疫检查点蛋白的新型抗体. 这一突破通过阻断TIM3信号,为兽医和人类医学提供了潜在的新型癌症疗法.
科学领域:
- 免疫学 免疫学 免疫学
- 在瘤学瘤学.
- 兽医医学 兽医医学 兽医医学
背景情况:
- 含有-3 (TIM3) 的T细胞免疫球蛋白和粘素域是一种免疫检查点蛋白.
- 狗癌症的TIM3患病率高于PD1,表明TIM3是比较免疫瘤学的有前途的治疗标.
- 开发针对犬癌的向疗法可以为人类免疫瘤学策略提供信息.
研究的目的:
- 隔离和描述针对TIM3受体的特定犬类抗体.
- 探索这些抗体在兽医瘤学中的治疗潜力.
- 验证使用犬类抗体库来发现自我抗原反应性抗体的使用.
主要方法:
- 利用多样化的天真犬 scFv 菌体显示库进行抗体隔离.
- 在哺乳动物细胞表达的Fc或GST标记的犬类TIM3中采用了交替的生物轮.
- 使用殖民地查和下一代深度测序 (NGS) 识别了scFv序列.
- 为功能验证,将选定的scFvs表达为模拟抗体 (scFv-Fc融合和全长IgG).
主要成果:
- 成功分离并表达了三种与犬类TIM3.3结合的犬类scFv抗体.
- 抗体在TIM3 IgV域内识别二硫化物稳定型构造表位.
- 这些抗体有效地减弱了TIM3与其连接体Galectin-9的结合.
- NGS使得低频抗体克隆的发现成为可能,增强了谱系分析.
结论:
- 纯粹的狗 scFv 抗体库对于产生针对 TIM3 等免疫检查点受体的抗体是有效的.
- 使用本地,折叠的,哺乳动物表达的抗原增加了获得形状敏感抗体的可能性.
- 这些发现支持开发针对TIM3的治疗方法,用于治疗犬类和人类类癌症.
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