Folate conjugated phosphorylcholine-based polycations for specific targeting in nucleic acids delivery

Area of Science:

• Biomaterials Science
• Nanotechnology
• Molecular Biology

Background:

• Folic acid is a known targeting ligand for imaging and therapeutics.
• Its application in nonviral gene delivery systems remains underexplored.
• Targeted gene delivery aims to improve therapeutic efficacy and reduce side effects.

Purpose of the Study:

• To evaluate a novel folic acid-conjugated copolymer (DMAEMA-MPC-FA) as a gene delivery vector.
• To assess the targeting specificity and transfection efficiency of the conjugate.
• To investigate the mechanism behind enhanced transfection.

Main Methods:

• Synthesis of a folic acid-conjugated aminomethacrylate-phosphoryl-choline copolymer (DMAEMA-MPC-FA).
• Formation of polyplexes with DNA and characterization of particle size and stability.
• In vitro transfection studies in folate receptor-overexpressing cells (MCF-7, KB) and control cells.
• Assessment of cellular association, DNA protection, and transfection efficiency.

Main Results:

• The DMAEMA-MPC-FA copolymer formed stable polyplexes with DNA (<200 nm) and offered partial DNA protection.
• Folate-conjugated systems demonstrated folate-specific cellular association in MCF-7 and KB cells.
• Significantly enhanced transfection efficiency was observed compared to nonconjugated controls.
• Reduced nonspecific cellular association and altered intracellular trafficking were suggested.

Conclusions:

• A novel folate-conjugated copolymer effectively forms DNA complexes for targeted gene delivery.
• The conjugate exhibits specific cellular uptake and enhanced transfection in folate receptor-positive cells.
• This approach offers a promising strategy for targeted nonviral gene therapy.