双功能的fab-scFv融合抗体通过准hFcRn介导的结肠丰富和TNF-α中和来缓解性结肠炎
Miao He1, Li Li2, Guorong Jiang2
1School of Pharmacy, Shanghai Jiao Tong University, Shanghai, 200240, PR China; School of Pharmacy, Dali University, Dali, 671000, Yunnan, PR China; Yunnan Provincial Key Laboratory of Entomological Biopharmaceutical R&D, School of Pharmacy, Dali University, Dali, Yunnan, PR China.
一种新型的融合蛋白,IFX-F8,增强了针对性结肠炎 (UC) 治疗的抗TNF-α疗法的输送到肠道. 这种工程蛋白针对人类新生儿的Fc受体 (hFcRn) 以改善与标准治疗相比的肠道保留和疗效.
科学领域:
- 胃肠道学和免疫学
- 生物技术和药物开发
- 炎症性肠道疾病研究研究
背景情况:
- 性结肠炎 (UC) 涉及肠道屏障功能障碍和炎症,通常用抗瘤缩因子-α (TNF-α) 药物治疗,如Infliximab (IFX).
- IFX的高分子量限制了其在肠道组织中的度,影响了治疗疗效.
- 人类新生儿Fc受体 (hFcRn) 在UC组织中的增强表达是改善药物输送的潜在目标.
研究的目的:
- 开发和评估一种新的双作用融合蛋白,IFX Fab-F8 (IFX-F8),用于增强性结肠炎治疗.
- 为了利用hFcRn介导的细胞转移和循环,提高肠道药物度和治疗效果.
- 在临床前UC模型中,比较IFX-F8与传统IFX和IFX Fab单一疗法的疗效.
主要方法:
- 通过将IFX Fab与hFcRn结合scFv (F8) 结合,构建一个双特异的Fab-scFv融合蛋白 (IFX-F8).
- 评估IFX-F8与TNF-α和hFcRn的结合亲缘关系,以及其血清半衰期.
- 在DSS诱导的UC小鼠中评估IFX-F8的治疗疗效,测量体重减轻,生存,ZO-1表达,组织积累和抑制Th17细胞和IL-17信号传递.
主要成果:
- IFX-F8证明了对TNF-α和hFcRn的高亲和度结合,通过hFcRn循环延长血清半衰期和增强肠道上皮质保留.
- 与IFX相比,内注射IFX-F8显著改善了DSS诱导的UC小鼠的生存率,减轻了体重减轻,并增强了ZO-1表达.
- IFX-F8在炎症的结肠组织中显示出优先积累,并且比IFX或IFX Fab具有更高的治疗效果,有效地抑制了致病性Th17细胞和IL-17信号传递.
结论:
- IFX-F8融合蛋白为增强性结肠炎的抗TNF-α治疗提供了一个有希望的策略.
- 在临床前模型中,hFcRn介导的向显著改善了肠道药物保留和治疗结果.
- IFX-F8显示出作为UC新型治疗剂的潜力,需要进一步的临床研究.
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