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Updated: Apr 30, 2026

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Dextran-peptide hybrid for efficient gene delivery.

Qiong Tang1, Bin Cao, Xia Lei

  • 1Department of Chemical and Biomolecular Engineering, University of Akron , Akron, Ohio 44325, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 3, 2014
PubMed
Summary

A novel dextran-peptide hybrid system offers a safer and more effective gene therapy vector. Low molecular weight dextran hybrids demonstrated superior gene expression and reduced toxicity compared to higher molecular weight counterparts.

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Area of Science:

  • Biomaterials Science
  • Gene Therapy
  • Nanotechnology

Background:

  • Gene therapy holds promise for treating genetic and acquired diseases but faces challenges with current delivery vectors, including toxicity and low efficiency.
  • Developing safe and efficient gene delivery vectors is crucial for advancing clinical applications of gene therapy.

Purpose of the Study:

  • To develop and evaluate a novel dextran-peptide hybrid system as a safe and efficient gene therapy vector.
  • To investigate the structure-function-cytotoxicity relationship of dextran-peptide hybrids for gene delivery.

Main Methods:

  • Dextrans (Dex10, Dex20, Dex70) of varying molecular weights were conjugated with a cationic peptide (R5H5) at different substitution degrees.
  • Gene expression and cytotoxicity of the dextran-peptide hybrids were assessed in SKOV-3 human ovarian carcinoma cells.
  • Performance was compared against a benchmark poly(ethylenimine) (PEI) vector.

Main Results:

  • Dextran-peptide hybrids derived from low molecular weight dextrans (Dex10-R5H5, Dex20-R5H5) exhibited higher gene expression and lower cytotoxicity than those from high molecular weight dextran (Dex70-R5H5).
  • The optimal vector, Dex10-R5H5 (40% R5H5 substitution), outperformed PEI in gene expression at a low N/P ratio (5).
  • This optimal vector also demonstrated significantly higher cell viability (93%) compared to PEI/DNA complexes (66%) at the same N/P ratio.

Conclusions:

  • Dextran-peptide hybrids, particularly those with low molecular weight dextran and high peptide substitution, represent a promising platform for safe and efficient gene therapy.
  • The developed Dex-R5H5 system addresses key limitations of existing gene delivery vectors, paving the way for improved therapeutic strategies.