Transforming Hairpin-like siRNA-Based Spherical Nucleic Acids into Biocompatible Constructs

Area of Science:

• Nanotechnology
• Molecular Biology
• Biochemistry

Background:

• Spherical nucleic acids (SNAs) offer unique properties for gene regulation.
• Conventional SNAs often utilize gold nanoparticle cores, which can present challenges in biocompatibility and cytotoxicity.
• Developing biocompatible alternatives is crucial for advancing SNA applications in medicine.

Purpose of the Study:

• To design and synthesize novel hairpin-like small interfering RNA spherical nucleic acids (siRNA-SNAs) utilizing biocompatible liposome nanoparticle cores.
• To evaluate the cellular uptake efficiency, cytotoxicity, and gene silencing capabilities of these liposome-based siRNA-SNAs.
• To demonstrate the potential of these constructs for inhibiting angiogenesis.

Main Methods:

• Synthesis of hairpin-like siRNA-SNAs with liposome nanoparticle cores.
• Characterization using gel electrophoresis, dynamic light scattering, and OliGreen quantification.
• In vitro assessment of cellular uptake, cytotoxicity, and vascular endothelial growth factor (VEGF) silencing in human umbilical vein endothelial cells.

Main Results:

• Liposome-based siRNA-SNAs demonstrated a 20-fold increase in cellular uptake efficiency compared to linear siRNA within 4 hours.
• These constructs exhibited a 4-fold reduction in cytotoxicity compared to gold nanoparticle-based siRNA-SNAs.
• Effective inhibition of angiogenesis in vitro was achieved by silencing VEGF.

Conclusions:

• Hairpin-like siRNA-SNAs based on biocompatible liposome cores represent a promising platform for enhanced gene regulation.
• These nanoconstructs offer improved cellular delivery and reduced toxicity, surpassing conventional gold-based siRNA-SNAs.
• The ability to effectively silence VEGF highlights their therapeutic potential for diseases involving angiogenesis.