PepFect14 peptide vector for efficient gene delivery in cell cultures

Area of Science:

• Biotechnology
• Molecular Biology
• Gene Therapy

Background:

• Nonviral gene delivery vectors, such as cell-penetrating peptides (CPPs), are essential for gene therapy.
• CPPs condense genetic material into nanoparticles for cellular delivery, but plasmid DNA (pDNA) delivery has faced efficiency challenges.
• Modifications, like stearic acid residues, can improve CPP performance in delivering genetic material.

Purpose of the Study:

• To evaluate PepFect14 (PF14), a CPP previously used for oligonucleotide delivery, as a nonviral vector for plasmid DNA (pDNA) delivery.
• To characterize the nanoparticles formed by PF14 and pDNA and assess their gene delivery efficiency in various cell types.
• To investigate the cellular uptake mechanisms of PF14/pDNA nanoparticles.

Main Methods:

• Formation and characterization of PepFect14 (PF14) and plasmid DNA (pDNA) nanoparticles, including size and surface charge analysis.
• Assessment of gene delivery and expression efficiency in adherent cell lines and primary cells.
• Cellular uptake studies using techniques to identify endocytosis pathways, including scavenger receptor involvement.

Main Results:

• PF14 forms stable nanoparticles with pDNA (130-170 nm size, negative surface charge).
• These PF14/pDNA nanoparticles demonstrate efficient gene delivery and expression in diverse cell lines, including challenging primary cells.
• Cellular uptake is primarily mediated by class A scavenger receptors (SCARA) and caveolae-mediated endocytosis.

Conclusions:

• PepFect14 (PF14) is an effective nonviral vector for delivering plasmid DNA (pDNA).
• PF14-based nanoparticles overcome previous limitations in CPP-mediated pDNA delivery.
• This finding supports the potential of PF14 in advancing gene therapy applications.