A Multi-RNAi Microsponge Platform for Simultaneous Controlled Delivery of Multiple Small Interfering RNAs.

Area of Science:

• Biotechnology
• Nanotechnology
• Molecular Biology

Background:

• Effective RNA interference (RNAi) therapy requires precise packaging of small interfering RNA (siRNA) molecules into nanostructures.
• Current delivery strategies face challenges in achieving controlled stoichiometry and simultaneous packaging of multiple siRNA components.

Purpose of the Study:

• To develop a novel RNA nanotechnology-based approach for creating composite microstructures (Multi-RNAi-MSs) capable of packaging multiple siRNA molecules at defined ratios.
• To engineer Multi-RNAi-MSs for optimized physicochemical properties for enhanced delivery and therapeutic efficacy.

Main Methods:

• Utilized rolling circle transcription to synthesize polymerized siRNA molecules.
• Self-assembled and densely packaged multiple siRNA components into sponge-like porous microstructures (Multi-RNAi-MSs).
• Employed polyelectrolyte condensation to convert Multi-RNAi-MSs into nanosized complexes with tailored properties.

Main Results:

• Successfully produced Multi-RNAi-MSs containing multiple polymeric siRNA molecules with precisely controlled stoichiometry.
• Demonstrated the ability to manipulate physicochemical properties (size, shape, surface charge) of the nanostructures for improved delivery.
• Maintained the multifunctional properties of the encapsulated siRNAs for combined therapeutic effects.

Conclusions:

• The developed Multi-RNAi-MS system offers a powerful strategy for simultaneous delivery of multiple siRNAs.
• These nanostructures hold significant potential for advancing RNAi-mediated therapies for cancer, genetic disorders, and viral infections.