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Endosomal escape of RNA therapeutics: How do we solve this rate-limiting problem?
1Department of Cellular and Molecular Medicine, UCSD School of Medicine, La Jolla, California 92093, USA sdowdy@ucsd.edu.
RNA (New York, N.Y.)
|January 20, 2023
Summary
RNA therapeutics show promise for treating diseases by targeting gene sequences. However, their delivery is hindered by endosomal entrapment, limiting their effectiveness outside the liver and central nervous system.
Area of Science:
- Biotechnology
- Molecular Biology
- Drug Delivery
Background:
- RNA therapeutics, including small interfering RNAs (siRNAs) and antisense oligonucleotides (ASOs), offer a promising avenue for disease treatment.
- Their efficacy relies on targeting specific gene sequences, bypassing the need for protein structure or localization data.
Purpose of the Study:
- To highlight the significant challenge of endosomal escape for RNA therapeutics.
- To underscore the necessity of overcoming this barrier for broader clinical application.
Main Methods:
- The abstract discusses the mechanism of cellular uptake for RNA therapeutics via endocytosis.
- It contrasts this with the passive diffusion of small molecule drugs.
Main Results:
- RNA therapeutics face a critical delivery barrier due to endosomal entrapment, with less than 1% escaping into the cytoplasm.
- This low endosomal escape rate is sufficient for liver and some CNS applications but inadequate for most other diseases.
Conclusions:
- The inability of RNA therapeutics to efficiently escape endosomes is a major limitation for treating widespread human diseases.
- Developing non-toxic solutions for endosomal escape is crucial for advancing RNA therapeutics.
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