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Related Experiment Video

Updated: Jun 22, 2026

Preparation and Characterization of Nanoliposomes for the Entrapment of Bioactive Hydrophilic Globular Proteins
11:30

Preparation and Characterization of Nanoliposomes for the Entrapment of Bioactive Hydrophilic Globular Proteins

Published on: August 31, 2019

A modified protocol for efficient DNA encapsulation into pegylated immunoliposomes (PILs).

Tina Skjørringe1, Torben Gjetting, Thomas G Jensen

  • 1Kennedy Center, Gl. Landevej 7, 2600 Glostrup, Denmark.

Journal of Controlled Release : Official Journal of the Controlled Release Society
|June 24, 2009
PubMed
Summary

This study presents an improved method for encapsulating DNA into pegylated immunoliposomes (PILs), enhancing their potential for non-invasive brain gene therapy. A new dialysis step ensures complete DNA delivery for central nervous system (CNS) treatments.

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Last Updated: Jun 22, 2026

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Neuroscience

Background:

  • Non-invasive gene delivery to the central nervous system (CNS) is crucial for treating neurological diseases.
  • Pegylated immunoliposomes (PILs) show promise for CNS delivery, but efficient DNA encapsulation remains a challenge.
  • Current methods for DNA encapsulation in PILs are difficult to reproduce and may compromise efficacy.

Purpose of the Study:

  • To develop an improved, reproducible protocol for DNA encapsulation into PILs.
  • To enhance the efficiency and reliability of non-invasive gene delivery to the brain.
  • To validate the improved PILs for targeted gene delivery in the CNS.

Main Methods:

  • Utilized ethanol-mediated DNA condensation for improved DNA encapsulation into PILs.
  • Incorporated a post-encapsulation dialysis step to remove ethanol and non-encapsulated DNA.
  • Employed live-cell confocal imaging to document cellular uptake of PILs.
  • Investigated cellular targeting by inhibiting clathrin-mediated endocytosis to assess specific receptor interactions.

Main Results:

  • The improved protocol demonstrated efficient DNA encapsulation into PILs.
  • The dialysis step was essential for complete removal of non-encapsulated DNA, confirmed by nucleolytic assays.
  • Live-cell imaging confirmed the uptake of PILs into human cells.
  • Specific targeting to the human insulin receptor was observed, with uptake reduced upon inhibition of clathrin-mediated endocytosis.

Conclusions:

  • The developed protocol offers a reproducible and effective method for DNA encapsulation in PILs.
  • This advancement facilitates the potential of non-invasive gene therapy for CNS disorders.
  • The study confirms the targeted uptake of PILs via specific cellular mechanisms.