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Gene-therapy Inspired Polycation Coating for Protection of DNA Origami Nanostructures

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Published on: January 19, 2019

[Formation and aggregation behavior of polyethyleneimine-DNA complexes].

Yun Lu¹, Jing Yao, Jian-Ping Zhou

¹Department of Pharmaceutics, China Pharmaceutical University, Nanjing 210009, China.

Yao Xue Xue Bao = Acta Pharmaceutica Sinica

|October 8, 2009

Summary

Polyethyleneimine (PEI)/DNA complexes form via electrostatic and non-electrostatic interactions, influencing gene delivery. Hydrophobic interactions drive aggregation, impacting transfection efficiency in HepG2 cells.

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Area of Science:

Biomaterials Science
Molecular Biology
Nanotechnology

Context:

Polyethyleneimine (PEI) is a highly efficient nonviral vector for in vitro gene delivery.
Understanding PEI/DNA complex formation is crucial for optimizing gene delivery systems.
Existing nonviral vectors face challenges in stability and efficiency.

Purpose:

To elucidate the formation mechanism of polyethyleneimine (PEI)/DNA complexes.
To investigate the role of electrostatic and non-electrostatic interactions in complex formation.
To analyze the aggregation behavior and its impact on gene delivery efficiency.

Summary:

Spectroscopy, electrophoresis, and transmission electron microscopy (TEM) revealed a "bead-on-string" transition phase during PEI/DNA complex formation.
Both electrostatic and non-electrostatic interactions contribute to complex stability, even at high ionic strengths.
Hydrophobic interactions, rather than electrostatic forces, primarily drive the aggregation of PEI/DNA complexes in varying salt concentrations.
Lower zeta potential at specific N/P ratios, possibly due to larger DNA plasmids, leads to aggregation, resembling a "clustered grape-string" structure.
PEI/DNA complexes at an N/P ratio of 12 demonstrated comparable transfection efficiency to Lipofectamine 2000 in HepG2 cells, suggesting alternative transfection mechanisms for larger or aggregated complexes.

Impact:

Provides fundamental insights into the self-assembly of nonviral gene delivery vectors.
Identifies key factors (N/P ratio, DNA size, ionic strength) influencing PEI/DNA complex structure and stability.
Suggests that aggregated complexes may utilize different cellular uptake or transfection pathways.
Offers potential for designing improved PEI-based gene delivery systems with tailored properties for enhanced therapeutic outcomes.