Arginine-based poly(ester amide) nanoparticle platform: From structure-property relationship to nucleic acid delivery

Area of Science:

• Biomaterials Science
• Nanomedicine
• Gene Therapy

Background:

• Polycations are widely used for nucleic acid delivery, yet structure-property relationships remain underexplored.
• A systematic investigation is needed to optimize polycation design for enhanced nucleic acid delivery efficiency.

Purpose of the Study:

• To synthesize and characterize a library of biodegradable arginine-based poly(ester amide) (Arg-PEA) biomaterials with tunable structures.
• To comprehensively investigate the structure-property relationships of Arg-PEAs for nucleic acid delivery.
• To evaluate the potential of Arg-PEAs in gene transfection, silencing, and nano-immunotherapy.

Main Methods:

• Synthesis of a diverse Arg-PEA library with variations in linker length, arginine salt type, side chain, chain stiffness, and molecular weight.
• Formation of Arg-PEA/nucleic acid nanoparticles (NPs) via electrostatic interactions.
• In vitro assessment of NP physicochemical properties (size, zeta potential, hydrophobicity) and biological functions (transfection efficiency, gene silencing, immune response modulation).

Main Results:

• Structural modifications of Arg-PEAs significantly influenced NP size, zeta potential, and hydrophobicity.
• These physicochemical changes precisely regulated nucleic acid transfection and silencing efficiencies.
• Arg-PEA/CpG NP structure modulated immune response, indicating potential for nano-immunotherapy.

Conclusions:

• Arg-PEAs offer tunable properties for effective nucleic acid delivery, demonstrating a clear structure-property relationship.
• The Arg-PEA library provides a versatile platform for optimizing gene delivery and developing novel nano-immunotherapies.
• These biomaterials show promise for various biomedical applications requiring efficient nucleic acid transport.