2-(Dimethylamino)ethyl methacrylate based (co)polymers as gene transfer agents

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Gene Delivery

Background:

• Poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) is a water-soluble cationic polymer.
• Cationic polymers are investigated for their ability to bind DNA via electrostatic interactions for gene delivery applications.

Purpose of the Study:

• To evaluate PDMAEMA as a non-viral gene transfection agent.
• To determine the optimal polymer/plasmid ratio for efficient gene delivery.
• To investigate the influence of polymer molecular weight and copolymer composition on transfection efficiency and cytotoxicity.

Main Methods:

• Complexation of plasmid DNA with PDMAEMA at various ratios.
• Transfection efficiency assessment in COS-7 and OVCAR-3 cells using a pCMV-lacZ reporter gene.
• Dynamic light scattering for complex size analysis.
• Cytotoxicity evaluation of polymer/DNA complexes.

Main Results:

• Optimal transfection efficiency was achieved at PDMAEMA/plasmid ratios of 3-5 (w/w), resulting in 3-6% transfected cells.
• Higher molecular weight PDMAEMA polymers (>300 kDa) effectively condensed DNA, leading to increased transfection efficiency.
• Copolymers of DMAEMA with MMA, triEGMA, or NVP exhibited varying transfection efficiencies and cytotoxicities compared to the homopolymer.

Conclusions:

• PDMAEMA is a promising cationic polymer for gene transfection, with efficiency dependent on polymer molecular weight and ratio.
• Copolymerization offers a strategy to modulate the transfection and safety profiles of PDMAEMA-based gene delivery systems.