Efficient and Low Cytotoxicity Gene Carriers Based on Amine-Functionalized Polyvinylpyrrolidone

Area of Science:

• Biomaterials Science
• Gene Therapy
• Polymer Chemistry

Background:

• Non-viral vectors are crucial for safe gene therapy delivery.
• Polyvinylpyrrolidone (PVP) is a promising, non-toxic polymer candidate for gene delivery.
• Functionalization of PVP can enhance its gene-carrying capabilities.

Purpose of the Study:

• To synthesize and evaluate novel polyvinylpyrrolidone (PVP) derivatives as non-viral gene carriers.
• To compare the gene delivery efficiency and cytocompatibility of modified PVP with polyethyleneimine (PEI).

Main Methods:

• Synthesis of PVP decorated with pyrrolidine, piperidine, and piperazine groups.
• DNA complexation studies using agarose gel electrophoresis and dynamic light scattering.
• In vitro transfection assays with murine fibroblast (Swiss 3T3) using luciferase reporter gene.
• Cytocompatibility assessment using calcein assay.

Main Results:

• All synthesized PVP copolymers effectively condensed DNA into polyplexes (100-400 nm) at N/P ratios ≥ 4:1.
• Piperidine-modified PVP exhibited higher transfection efficiency than pyrrolidine and piperazine analogs, outperforming PEI.
• PVP-based polyplexes showed significantly higher cytocompatibility (75-95%) compared to PEI (55%).

Conclusions:

• Functionalized PVP, particularly with piperidine groups, represents a potent and safe non-viral gene delivery system.
• These novel PVP derivatives offer a promising alternative to existing non-viral vectors like PEI for gene therapy applications.