Enhancing the Stability and Immunomodulatory Activity of Liposomal Spherical Nucleic Acids through Lipid-Tail DNA...

Area of Science:

• Nanotechnology
• Biochemistry
• Immunology

Background:

• Liposomal spherical nucleic acids (LSNAs) are promising for gene regulation and immunomodulation.
• LSNAs combine liposomal cores with dense nucleic acid shells for biological activity.

Purpose of the Study:

• Compare conventional cholesterol-anchored LSNAs with novel lipid-modified LSNAs.
• Evaluate differences in oligonucleotide surface density, stability, and cellular uptake.

Main Methods:

• Synthesized two types of LSNAs: cholesterol-terminated and lipid-modified.
• Measured oligonucleotide surface density using fluorescence assays.
• Assessed LSNA stability in serum and cellular uptake in immune reporter cell lines.

Main Results:

• Lipid-modified LSNAs achieved approximately double the oligonucleotide surface coverage.
• These LSNAs demonstrated significantly enhanced stability against liposomes and serum proteins.
• Increased and faster cellular uptake was observed for lipid-modified LSNAs.

Conclusions:

• Novel lipid-functionalized LSNAs offer superior stability and cellular uptake compared to conventional designs.
• These enhanced LSNAs show increased sequence-specific toll-like receptor activation.
• Lipid-modified LSNAs represent a promising platform for advanced immunotherapy.