Hepatic gene delivery system electrostatically assembled with glycyrrhizin

Area of Science:

• Biotechnology
• Gene Therapy
• Nanomedicine

Background:

• Effective gene delivery vectors are crucial for therapeutic applications.
• Targeting specific organs like the liver can enhance treatment efficacy and reduce side effects.
• Polyethylenimine (PEI) is a common cationic polymer for gene delivery but often lacks specificity.

Purpose of the Study:

• To develop a novel, liver-targeted gene delivery vector.
• To characterize the physicochemical properties and gene expression efficiency of the new vector.
• To evaluate the therapeutic potential of the liver-targeted vector in a preclinical model.

Main Methods:

• A ternary complex (pDNA/PEI/GL) was formed by coating pDNA/PEI with glycyrrhizin (GL).
• Particle size, surface charge, and stability of the complex were analyzed.
• Gene expression levels were assessed in HepG2 cells and in vivo after intravenous injection in mice.
• Pharmacological activity was evaluated using a plasmid encoding insulin (pCMV-Ins) in a mouse model.

Main Results:

• The pDNA/PEI/GL complex formed stable, ~100 nm particles with a negative surface charge.
• High gene expression was observed in HepG2 cells without cytotoxicity or agglutination.
• Intravenous administration in mice resulted in preferential gene expression in the liver, particularly in parenchymal cells.
• Administration of pCMV-Ins/PEI/GL led to a significant decrease in blood glucose levels in mice.

Conclusions:

• The developed glycyrrhizin-coated complex (pDNA/PEI/GL) is an effective liver-targeted gene delivery vector.
• This vector demonstrates high gene expression efficiency and therapeutic potential in vivo.
• The pDNA/PEI/GL ternary complex represents a promising platform for liver-directed gene therapy.