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Related Experiment Videos

Tumor targeting with surface-shielded ligand--polycation DNA complexes.

R Kircheis1, T Blessing, S Brunner

  • 1Boehringer Ingelheim Austria, Dr. Boehringer-Gasse 5-11, A-1121 Vienna, Austria.

Journal of Controlled Release : Official Journal of the Controlled Release Society
|June 8, 2001
PubMed
Summary

Targeted gene delivery to tumors was improved by shielding DNA complexes with transferrin (Tf) or epidermal growth factor (EGF), enhancing tumor cell targeting. Surface charge modification of these complexes is key for effective in vivo gene transfer.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Gene Therapy

Background:

  • Receptor binding ligands like transferrin (Tf) and epidermal growth factor (EGF) can enhance gene transfer into tumor cells.
  • The surface charge of DNA complexes significantly influences their in vivo gene transfer characteristics, especially in systemic applications.
  • Positively charged DNA/polyethylenimine (PEI) complexes tend to accumulate in the lungs after intravenous administration.

Purpose of the Study:

  • To investigate the receptor-dependent enhancement of gene transfer into tumor cell lines using Tf or EGF ligands.
  • To evaluate the in vivo gene transfer efficiency and biodistribution of surface-shielded DNA complexes.
  • To explore methods for masking the surface charge of DNA complexes for improved systemic gene delivery.

Main Methods:

Related Experiment Videos

  • Incorporation of Tf or EGF into DNA/PEI complexes to create receptor-targeted vectors.
  • Systemic administration of DNA complexes into A/J mice via tail vein injection.
  • Surface charge shielding of DNA complexes using polyethylene glycol (PEG) or sufficient Tf protein incorporation.
  • Utilizing lower-molecular weight polycations for charge-shielded complexes.

Main Results:

  • Surface-shielded Tf-polycation/DNA complexes preferentially delivered genes to distant subcutaneous Neuro2a tumors.
  • In contrast, positively charged DNA/PEI complexes primarily directed gene transfer to the lungs.
  • Both PEGylation and sufficient Tf protein incorporation effectively shielded the surface charge of the complexes.

Conclusions:

  • Receptor-mediated targeting with Tf or EGF ligands enhances gene transfer into tumor cells.
  • Surface charge shielding of DNA complexes is crucial for directing gene delivery to specific tissues and avoiding off-target accumulation.
  • Surface-shielded complexes offer a promising strategy for targeted systemic gene therapy.