Bioreducible POSS-cored star-shaped polycation for efficient gene delivery.

Area of Science:

• Polymer Chemistry
• Biomaterials Science
• Nanotechnology

Background:

• Developing efficient and safe gene delivery vectors is crucial for gene therapy.
• Polyhedral oligomeric silsesquioxane (POSS) offers a versatile platform for creating novel nanostructures.
• Disulfide bonds can be incorporated into polymers to impart bioreducible properties.

Purpose of the Study:

• To synthesize and characterize a novel bioreducible star-shaped gene vector based on POSS.
• To evaluate the DNA complexation ability, bioreducibility, and in vitro gene transfection efficiency of the synthesized vector.
• To compare the performance of the bioreducible vector with its non-bioreducible counterpart.

Main Methods:

• Synthesis of POSS-(SS-PDMAEMA)8 via atom transfer radical polymerization (ATRP).
• Characterization of molecular weight distribution and structure.
• Assessment of pDNA complexation, particle size, and zeta potential.
• In vitro cytotoxicity and gene transfection assays.

Main Results:

• Successfully synthesized a well-defined star-shaped polymer POSS-(SS-PDMAEMA)8 with controllable arm length.
• The vector effectively formed uniform nanocomplexes with pDNA.
• POSS-(SS-PDMAEMA)8 exhibited facile bioreducibility due to disulfide linkages.
• Compared to the non-bioreducible version, POSS-(SS-PDMAEMA)8 showed significantly lower cytotoxicity and higher transfection efficiency.

Conclusions:

• POSS-(SS-PDMAEMA)8 is a promising bioreducible gene vector with enhanced safety and efficacy.
• The disulfide linkages are key to improving gene delivery performance.
• This study provides valuable insights for designing next-generation POSS-based drug and gene delivery systems.