[PEI-PMMA cationic nanoparticles as carriers for gene transfer]

Area of Science:

• Biomaterials Science
• Nanotechnology
• Gene Delivery

Context:

• Gene therapy holds immense potential but faces challenges with efficient and safe DNA delivery vectors.
• Non-viral gene delivery systems are actively researched to overcome the limitations of viral vectors, such as immunogenicity and integration risks.
• Cationic polymers are widely explored for their ability to complex with nucleic acids and facilitate cellular uptake.

Purpose:

• To synthesize and characterize poly (ethyleneimine)-g-poly (methyl methacrylate) (PEI-PMMA) nanoparticles.
• To evaluate the gene delivery efficiency and mechanism of PEI-PMMA nanoparticles using pGL3 plasmid and HeLa cells.
• To investigate the properties of PEI-PMMA nanoparticles as potential non-viral gene delivery carriers.

Summary:

• PEI-PMMA nanoparticles were synthesized via free radical polymerization, exhibiting spherical morphology and monodispersity with a size of 172 nm and zeta potential of +50.3 mV.
• Complexation with pGL3 plasmid at N/P ratios of 5:1 and 20:1 resulted in particle sizes of 133 nm and 139 nm, respectively, with complete complexation achieved at a 5:1 ratio.
• Confocal microscopy revealed that PEI-PMMA nanoparticles facilitate gene transfer into HeLa cells through endocytosis, with subsequent release of the plasmid into the cytosol.

Impact:

• Demonstrates the successful application of PEI-PMMA nanoparticles for effective DNA delivery into target cells.
• Highlights the potential of PEI-PMMA nanoparticles as a safe and efficient non-viral alternative for gene therapy applications.
• Provides insights into the endosomal escape mechanism mediated by PEI-PMMA nanoparticles, crucial for optimizing gene transfer efficacy.