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聚β-氨基的物理化学性质决定了siRNA从静电组装涂层中传递的过程

Adam G Berger^1,2,3, Charles DeLorenzo^3,4, Chau Vo^1,2,3

¹Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

Biomacromolecules

|April 30, 2024

概括

优化聚β-氨基 (PBAE) 聚合物进行层次组装 (LbL) 增强了短干扰RNA (siRNA) 的传递. 特定的PBAE特性,如疏水性和pKa,可显著提高siRNA转染疗效,用于潜在的治疗应用.

科学领域:

生物材料科学生物材料科学
纳米技术纳米技术
分子生物学分子生物学

背景情况:

局部短干扰RNA (siRNA) 疗法提供高特异性的分子治疗,但面临细胞内传递障碍.
有效的siRNA输送需要先进的药物输送系统来进行包装和控制释放,这对于临床翻译至关重要.
使用聚-β-氨基 (PBAE) 聚合物进行层对层 (LbL) 静电组装是siRNA传递的一个有前途的策略.

研究的目的:

系统地研究PBAE物理化学性质对siRNA转染疗效在体外的影响.
了解PBAE的结构变异如何影响它们与siRNA的相互作用和转染效率.
为了将聚合物特性与合体和薄膜LbL涂层传递系统的性能相关联.

主要方法:

合成和表征了四种结构相似的PBAE,具有不同的物理化学特性.
评估了使用这些PBAE在合体和LbL薄膜涂层格式的siRNA转染疗效.
分析了聚合物-siRNA相互作用,释放动力学和细胞吸收机制.

主要成果:

在PBAE中发生的小结构变化导致了疏水性,pKa和氨基化学的显著变化.
具有高水性 (堵塞P = 7.86) 和最佳pKa (6.21) 的Poly3显示出最稳定的siRNA相互作用 (Keff = 0.298).
聚3表现出增强的内分体缓冲和逃逸,导致在合体和LbL薄膜方法中优异的记者基因沉默.

结论:

PBAE的物理化学特性极大地影响siRNA复杂化,释放和转染效率.
聚3的独特特性使其在通过LbL涂层传递siRNA方面非常有效,特别是用于伤口包装应用.
这项研究为设计具有定制性质的PBAE提供了一个框架,用于改进基于siRNA的治疗方法.

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