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RNA Interference

RNA Interference

RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...

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Programmable RNA Loading of Extracellular Vesicles with Toehold-Release Purification.

Mette Galsgaard Malle¹, Ping Song¹, Philipp M G Löffler²

¹Interdiscilinary Nanoscience Center, Aarhus University, 8000 Aarhus C, Denmark.

Journal of the American Chemical Society

|April 26, 2024

Summary

This summary is machine-generated.

Researchers developed a new method using DNA to fuse extracellular vesicles (EVs) with liposomes, creating novel nanocarriers (EVLs) for improved RNA delivery. This technique enhances mRNA loading and translation, offering a safer alternative to synthetic lipid nanoparticles (LNPs).

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Published on: October 18, 2024

Area of Science:

Biotechnology and Nanomedicine
Drug Delivery Systems
Molecular Biology

Background:

Lipid nanoparticles (LNPs) are common drug delivery vesicles but suffer from poor biocompatibility and immune reactions.
Extracellular vesicles (EVs) offer a promising alternative due to their natural origin, safety, and multifunctionality.
Efficiently loading large biomolecules like mRNA into EVs remains a significant challenge.

Purpose of the Study:

To develop a controlled method for loading extracellular vesicles (EVs) with messenger RNA (mRNA).
To create novel hybrid nanocarriers, termed EV-liposome hybrids (EVLs), for enhanced RNA therapeutics delivery.
To evaluate the efficiency and scalability of the EVL production and their performance in gene expression.

Main Methods:

Utilized DNA-mediated, programmed fusion between EVs and mRNA-loaded liposomes.
Employed real-time microscopy with immobilized EVs for single-particle fusion efficiency analysis.
Scaled up production using magnetic beads and DNA strand-replacement reactions for EVL collection.

Main Results:

Demonstrated successful encapsulation of mCherry mRNA within the fused EVL particles.
Showcased enhanced transfection and improved mRNA translation in HEK293-H cells compared to traditional liposomes or LNPs.
Achieved a million-fold scale-up in EVL production using magnetic bead-based methods.

Conclusions:

The developed DNA-mediated fusion technique provides a controlled and efficient method for creating EV-liposome hybrids (EVLs).
EVLs serve as effective nanocarriers for RNA therapeutics, improving delivery and translation efficacy.
This approach represents a significant advancement for EV-mediated delivery of RNA therapeutics, overcoming limitations of current synthetic nanoparticles.