Highly efficient siRNA delivery from core-shell mesoporous silica nanoparticles with multifunctional polymer caps

Area of Science:

• Nanotechnology
• Biomaterials Science
• Gene Therapy

Background:

• Developing efficient delivery systems for small interfering RNA (siRNA) is crucial for gene therapy.
• Mesoporous silica nanoparticles (MSN) offer potential as drug carriers due to their tunable properties.

Purpose of the Study:

• To develop and characterize a novel core-shell silica nanocarrier system for enhanced siRNA delivery.
• To investigate the influence of nanocarrier properties on siRNA loading and release kinetics.
• To evaluate the efficacy of the system for gene silencing in cellular models.

Main Methods:

• Synthesis of core-shell mesoporous silica nanoparticles (MSN) with varying pore sizes and morphologies.
• Characterization of siRNA loading capacity and release profiles under different conditions (pH, pore size).
• Evaluation of cell transfection efficiency and gene knockdown efficacy using KB-cells and a luciferase reporter gene.

Main Results:

• Achieved high siRNA loading capacities (up to 380 μg/mg MSN) driven by electrostatic interactions.
• Demonstrated controlled siRNA release (up to 80% in 24 h) from MSN.
• Successfully transfected KB-cells and achieved significant luciferase gene knockdown (80-90%) with low siRNA concentrations.

Conclusions:

• The developed core-shell MSN platform provides an effective and efficient system for siRNA delivery.
• The system's design, utilizing electrostatic interactions and a multifunctional block copolymer, enables high loading and controlled release.
• This nanocarrier system holds significant promise for therapeutic applications in gene silencing.