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Related Experiment Video

Updated: Nov 20, 2025

Generation of Cationic Nanoliposomes for the Efficient Delivery of In Vitro Transcribed Messenger RNA
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Anionic Complex with Efficient Expression and Good Safety Profile for mRNA Delivery.

Eri Hamada1, Tomoaki Kurosaki1,2, Junya Hashizume2

  • 1Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki 852-8588, Japan.

Pharmaceutics
|January 22, 2021
PubMed
Summary

We developed a novel mRNA delivery system using polyethylenimine (PEI) and γ-polyglutamic acid (γ-PGA). This safe and effective mRNA/PEI8/γ-PGA12 complex achieves high protein expression in vivo without cytotoxicity.

Keywords:
mRNAnanoparticlespolyethyleneimineγ-polyglutamic acid

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Area of Science:

  • Biotechnology
  • Gene Therapy
  • Nanomedicine

Background:

  • Messenger RNA (mRNA) is a promising alternative to plasmid DNA (pDNA) for gene therapy.
  • Developing safe and efficient mRNA delivery systems is crucial for therapeutic applications.
  • Previous work demonstrated successful pDNA delivery using polyethylenimine (PEI) and γ-polyglutamic acid (γ-PGA).

Purpose of the Study:

  • To create a stable and non-cytotoxic delivery vehicle for mRNA.
  • To evaluate the physicochemical properties, cytotoxicity, and protein expression of novel mRNA complexes.
  • To assess the in vivo biodistribution and protein expression of the optimized mRNA delivery system.

Main Methods:

  • Formulation of various cationic and anionic complexes using mRNA, PEI, and γ-PGA.
  • Characterization of physicochemical properties and cytotoxicity of the complexes.
  • In vitro and in vivo assessment of protein expression using firefly luciferase mRNA.
  • Intravenous administration of the optimized complex in mice to determine biodistribution.

Main Results:

  • Cationic mRNA/PEI complexes exhibited high protein expression but also significant cytotoxicity.
  • An optimized anionic complex, mRNA/PEI8/γ-PGA12, demonstrated stability and high in vitro protein expression without cytotoxicity.
  • In vivo studies in mice showed high protein expression in the spleen and liver, with slight expression in the lungs within 24 hours post-administration.

Conclusions:

  • The mRNA/PEI8/γ-PGA12 complex represents a safe and effective strategy for mRNA delivery.
  • This novel formulation overcomes the limitations of previous mRNA delivery systems.
  • The developed system holds potential for advancing mRNA-based therapeutics.