Engineering poly- and micelleplexes for nucleic acid delivery - A reflection on their endosomal escape

Area of Science:

• Biomaterials Science
• Nanotechnology
• Molecular Biology

Background:

• Polycationic drug carriers, particularly polyethyleneimine-based systems, faced historical skepticism for clinical use.
• Recent patent disclosures and clinical trial progress indicate growing acceptance of these nucleic acid delivery systems.

Purpose of the Study:

• To provide a comprehensive guide for developing advanced polyplex and micelleplex systems for therapeutic nucleic acid delivery.
• To engineer vectors for enhanced endosomal escape and minimized toxicity.
• To leverage knowledge of polymer vector design and endosomal trafficking.

Main Methods:

• Review of existing literature on polycationic drug carriers and nucleic acid therapeutics.
• Detailed discussion of endosomal trafficking and mechanisms of polyplex endosomal escape.
• Analysis of polymer vector design principles and their impact on delivery performance.

Main Results:

• The tunability of polymer-based vectors presents both opportunities and challenges in formulation.
• Understanding adjustment parameters is crucial for optimizing drug carrier performance.
• Cellular peculiarities can be leveraged to improve vector targeting and efficacy.

Conclusions:

• A strategic approach to polycationic vector design is essential for successful nucleic acid delivery.
• Maximizing endosomal escape while minimizing toxicity is a key objective.
• Future developments should consider cellular specificities for improved therapeutic outcomes.