Cationic lipid nanoparticle production by microfluidization for siRNA delivery

Area of Science:

• Biotechnology
• Nanotechnology
• Drug Delivery

Background:

• Cationic lipid nanoparticles (CLNs) are crucial for delivering nucleic acids like short interfering RNAs (siRNAs).
• Traditional methods for CLN production can be inefficient and difficult to scale.
• Microfluidization presents a promising alternative for scalable CLN synthesis.

Purpose of the Study:

• To optimize the microfluidization process for producing CLNs for siRNA delivery.
• To characterize the physicochemical properties of the resulting CLNs and siRNA-lipoplexes.
• To evaluate the stability and gene silencing efficacy of the optimized CLNs.

Main Methods:

• Design of Experiments (DoE) was employed to optimize microfluidization parameters.
• Key parameters included microfluidization passages (3) and pressure (10,000 psi).
• Thin film hydration volume (4 mL) and charge ratio (+/- 8) were critical for lipoplex formation.

Main Results:

• Optimized microfluidization produced CLNs with a mean size of 160 nm and a polydispersity index of 0.2-0.3.
• The CLNs exhibited a zeta potential of +40 mV to +60 mV.
• At a (+/-) charge ratio of 8, 88% of siRNA was associated with stable lipoplexes for one month.

Conclusions:

• Microfluidization is an effective, scalable method for producing CLNs for siRNA delivery.
• Optimized parameters yield CLNs with desirable size, charge, and high siRNA encapsulation.
• Further optimization is needed to enhance the gene silencing efficacy and reduce cytotoxicity of the lipoplexes.