对pH响应性干对EGFR向性干合性siRNA中mRNA敲除的作用
Toshimasa Harumoto1, Ryohei Kawai1, Keiichi Motosawa1
1Research Unit, Research Division, Kyowa Kirin Co., Ltd., Otemachi Financial City Grand Cube, 1-9-2 Otemachi, Chiyoda-ku, Tokyo 100-0004, Japan.
ACS chemical biology
|February 3, 2025
概括
联小干扰RNAs (siRNAs) 需要特定的联受体相互作用才能有效地击退mRNA. 这些复合物的细胞内解离,特别是在低pH下,对于增强治疗输送和疗效至关重要.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 药物运输 药物运输 药物运输
背景情况:
- 联小干扰RNAs (siRNAs) 对基于核酸的药物具有前景.
- 有效的mRNA淘汰取决于受体表达和连接体内化,但内化后的动态不清楚.
研究的目的:
- 为了研究在低pH下对联体受体结合解离对siRNA传递和疗效的影响.
- 为了优化连接体-受体对,增强细胞内siRNA释放和mRNA淘汰.
主要方法:
- 化学合成的经过修改的表皮生长因子 (EGF) 配体,对EGF受体 (EGFR) 具有不同的低pH结合亲和力.
- 使用修饰的EGF配体和抗体碎片 (抗EGFR IgG 和 Fab) 开发的siRNA结合物.
- 在不同的pH条件下,评估EGFR表达细胞中的内部化和mRNA倒置活性.
主要成果:
- 一种不太适应pH的EGF变体 (EGF H10Y/H16Y) 结合体显示内部化和mRNA敲击减少.
- 与抗EGFR IgG-siRNA相比,抗EGFR Fab-siRNA,在低pH下解离,表现出优异的内部化和mRNA敲击,与抗EGFR IgG-siRNA相比.
- 抗EGFRIgG-siRNA的强烈低pH结合与有效性降低相关.
结论:
- 细胞内联体受体解离对于有效的siRNA传递和mRNA淘汰至关重要.
- 在酸性内体环境中释放它们的受体的配体的设计增强了治疗潜力.
- 这些发现指导了下一代基于核酸的治疗方法的发展.
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