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Published on: August 13, 2021
Preparation of mRNA Polyplexes with Post-conjugated Endosome-Disruptive Peptides
Bo Lou1, Chun Yin Jerry Lau1, Wim E Hennink1
1Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Science (UIPS), Utrecht University, Utrecht, The Netherlands.
Abstract:
Successful delivery of mRNA into the cytosol of professional antigen-presenting cells (APCs) poses one of the biggest challenges in developing effective mRNA vaccines to treat various cancers and viral infectious diseases. However, most polymeric mRNA delivery systems fail to transfect APCs. We have discovered that decoration of pH-sensitive endosome-disruptive GALA peptides on the surface of mRNA polyplexes leads to efficient targeting and transfection of APCs. GALA peptides not only enhance specific uptake in APCs through binding to sialic acid moieties, they also facilitate the endosomal escape of mRNA especially in dendritic cells (DCs). Here, we describe in detail the production of stabilized mRNA polyplexes post-conjugated with GALA peptides via copper-free click chemistry. Methods described here include the synthesis and purification of GALA peptides and its conjugation to mRNA polyplexes.
Insights
Researchers developed a novel method to improve mRNA vaccine delivery. Attaching GALA peptides to mRNA polyplexes enhances targeting and delivery into antigen-presenting cells (APCs), overcoming a major hurdle in cancer and infectious disease vaccine development.
Area of Science:
- Biotechnology
- Vaccinology
- Molecular Biology
Background:
- Effective mRNA vaccine development relies on efficient delivery into antigen-presenting cells (APCs).
- Current polymeric delivery systems often fail to successfully transfect APCs, limiting vaccine efficacy.
- Targeting APCs is crucial for potent immune responses against cancers and viral infections.
Purpose of the Study:
- To develop an improved mRNA delivery system for enhanced APC transfection.
- To investigate the role of GALA peptides in mRNA delivery and endosomal escape.
- To detail the production of GALA peptide-conjugated mRNA polyplexes.
Main Methods:
- Synthesis and purification of pH-sensitive, endosome-disruptive GALA peptides.
- Post-conjugation of GALA peptides to mRNA polyplexes using copper-free click chemistry.
- Characterization of stabilized mRNA polyplexes for targeted delivery.
Main Results:
- GALA peptide decoration enables efficient targeting and transfection of APCs.
- GALA peptides enhance specific uptake in APCs via sialic acid binding.
- GALA peptides facilitate mRNA endosomal escape, particularly in dendritic cells (DCs).
Conclusions:
- GALA peptide conjugation represents a promising strategy for enhancing mRNA vaccine delivery to APCs.
- This approach addresses a key challenge in developing effective mRNA therapeutics for cancer and infectious diseases.
- The described methods provide a detailed protocol for producing advanced mRNA delivery systems.
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