Structure-Function Correlation of Aminated Poly(α)glutamate as siRNA Nanocarriers

Area of Science:

• Biomaterials Science
• Gene Therapy
• Polymer Chemistry

Background:

• Cationic polymers have been explored for oligonucleotide delivery for 20 years.
• Optimal properties for successful delivery vehicles remain undefined.
• RNA interference (RNAi) necessitates advanced nanocarriers overcoming stability, cellular uptake, and endosomal escape challenges.

Purpose of the Study:

• To synthesize and evaluate a library of biodegradable aminated poly(α)glutamate polymers.
• To elucidate the structure-function relationship of these polymers in oligonucleotide delivery.
• To identify optimal physicochemical properties for effective and safe RNAi delivery.

Main Methods:

• Synthesis of a polymer library with varied amine moieties.
• Physicochemical characterization of polyplexes formed with the synthesized polymers.
• In vitro evaluation of cellular internalization, gene silencing activity, and cytotoxicity.
• In vivo safety assessment in mice.

Main Results:

• Several synthesized polymer structures demonstrated enhanced cellular internalization.
• Identified candidates effectively silenced gene expression to below 50% of initial levels.
• The developed polyplexes exhibited safety in both cellular and animal models.

Conclusions:

• Tailor-designed biodegradable aminated poly(α)glutamates represent a promising platform for siRNA delivery.
• The study provides insights into structure-function relationships for optimizing nanocarrier design.
• This research paves the way for improved therapeutic strategies utilizing RNAi technology.