对脂质纳米粒子介导的mRNA输送进行PEGylated脂质查,组合优化和结构-活性关系的确定
Lingyun Liu1, Jae-Heon Kim1, Zhongyu Li1
1mRNA Center of Excellence, Sanofi, Waltham, MA 02451, USA. Shri.Karve@Sanofi.com.
Nanoscale
|March 25, 2025
概括
优化脂质纳米粒子 (LNP) 组成可以提高mRNA输送. 这项研究确定了关键的配方因素,包括PEGylated脂质和膜完整性,这对于有效的基于LNP的疫苗和疗法至关重要.
科学领域:
- 生物技术和制药科学 生物技术和制药科学
- 纳米医学和药物输送系统
背景情况:
- 脂质纳米颗粒 (LNP) 对于疫苗和疗法中的mRNA输送至关重要,COVID-19后兴趣急剧增加.
- 优化LNP的组成和理解结构-活性关系 (SAR) 对于提高输送效率和蛋白质表达至关重要.
研究的目的:
- 系统地选PEGylated脂质用于肌肉内mRNA输送.
- 使用实验设计 (DoE) 方法优化LNP配方组成.
- 研究LNP的SAR,重点关注物理化学性质和转染效率.
主要方法:
- 选了来自四个家族 (甘油,甲胺,胆固醇,胺) 的29种PEG化脂质,化学成分各不相同.
- 雇用 DoE 优化 LNP 配方,以提高体内传染效率.
- 进行了先进的物理化学表征:劳尔丹试验,SAXS,Cryo-TEM,QCM-D和标准LNP分析.
主要成果:
- 确定了1,2-Dimyristoyl-rac-glycero-3-methoxypolyethylene glycol - 5000 (DMG-PEG5k) 作为一个有前途的PEG化脂质.
- 与DMG-PEG2k基准相比,通过配方优化实现了蛋白质表达的增加.
- 发现了高mRNA封装,LNP膜完整性 (尤其是酸性),并对转染至关重要的内部结构有序;较低的PEG-脂质分数增加了封装;较低的GP7.5/GP4.5比率与增强的表达相关.
结论:
- 平衡LNP组件比率对于最大限度地发挥功能至关重要.
- 这项研究为LNP SAR和设计下一代LNP的指导方针提供了宝贵的见解.
- 增强转染的关键因素包括膜完整性和有序的内部结构,受电离性脂质和胆固醇比率的影响.
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