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Efficient Delivery of DNA Using Lipid Nanoparticles.

Lishan Cui1, Serena Renzi2, Erica Quagliarini2

  • 1School of Biosciences and Veterinary Medicine, University of Camerino, 62032 Camerino, Italy.

Pharmaceutics
|August 26, 2022
PubMed
Summary

This study introduces DNA-loaded lipid nanoparticles (LNPs) created via microfluidics as a safer, more effective alternative to electroporation for cancer DNA vaccines. These novel LNPs enhance cellular uptake and antigen expression, advancing gene delivery for tumor treatment.

Keywords:
DNA vaccinesHER2lipid nanoparticles

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Area of Science:

  • Biotechnology
  • Nanomedicine
  • Cancer Therapy

Background:

  • DNA vaccines show promise for cancer treatment but suffer from poor cellular uptake.
  • Electroporation enhances DNA delivery but causes significant cell damage and side effects.
  • Lipid nanoparticles (LNPs) are successful for mRNA/siRNA but their use with DNA is less understood.

Purpose of the Study:

  • To develop and characterize DNA-loaded LNPs using a microfluidic platform for improved cancer DNA vaccine delivery.
  • To evaluate the transfection efficiency and cytotoxicity of these novel DNA-loaded LNPs in vitro.
  • To assess the efficacy of the optimized LNP formulation in delivering a DNA vaccine targeting HER2 in cancer cells.

Main Methods:

  • Microfluidic platform for generating DNA-loaded lipid nanoparticles (LNPs).
  • Characterization using dynamic light scattering (DLS), synchrotron small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM).
  • In vitro assessment of transfection efficiency (TE) and cytotoxicity in HEK-293 and CHO cells.
  • In vitro validation of DNA vaccine delivery targeting HER2 using FACS, immunofluorescence, and confocal microscopy.

Main Results:

  • Microfluidics successfully generated DNA-loaded LNPs with characterized properties.
  • Screening identified an LNP formulation with high transfection efficiency and low cytotoxicity.
  • The optimized LNPs effectively delivered the pVAX-hECTM DNA vaccine, leading to massive HER2 antigen expression on HEK-293 cells.
  • Demonstrated a favorable structure-activity relationship for DNA-loaded LNPs.

Conclusions:

  • Microfluidically produced DNA-loaded LNPs offer a promising, less invasive alternative to electroporation for cancer DNA vaccination.
  • These findings advance the understanding of DNA-loaded LNP technology for gene delivery.
  • The developed LNP platform is suitable for preclinical studies in cancer therapy.