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Gene Therapy00:59

Gene Therapy

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Gene therapy is a technique where a gene is inserted into a person’s cells to prevent or treat a serious disease. The added gene may be a healthy version of the gene that is mutated in the patient, or it could be a different gene that inactivates or compensates for the patient’s disease-causing gene. For example, in patients with severe combined immunodeficiency (SCID) due to a mutation in the gene for the enzyme adenosine deaminase, a functioning version of the gene can be...
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Related Experiment Video

Updated: Feb 22, 2026

A Tetracycline-regulated Cell Line Produces High-titer Lentiviral Vectors that Specifically Target Dendritic Cells
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An efficient, non-viral dendritic vector for gene delivery in tissue engineering.

D P Walsh1,2,3,4, A Heise5,6, F J O'Brien2,3,4,5

  • 1School of Pharmacy, RCSI, Dublin, Ireland.

Gene Therapy
|September 15, 2017
PubMed
Summary

Activated polyamidoamine dendrimers (dPAMAM) effectively deliver genes to mesenchymal stem cells (MSCs) in tissue engineering scaffolds. This dPAMAM vector offers a biocompatible and tailored gene delivery system for tissue defect regeneration.

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Area of Science:

  • Biomaterials Science
  • Gene Therapy
  • Tissue Engineering
  • Cell Biology

Background:

  • Tissue engineering (TE) increasingly integrates gene therapeutics with biomaterial scaffolds.
  • Mesenchymal stem cells (MSCs) are crucial for regenerative medicine applications.
  • Efficient and safe gene delivery vectors are essential for TE success.

Purpose of the Study:

  • To evaluate activated polyamidoamine dendrimer (dPAMAM) as a gene delivery vector for MSCs.
  • To assess dPAMAM's efficacy in both monolayer and 3D collagen-based scaffold cultures.
  • To compare dPAMAM with polyethylenimine (PEI) for gene delivery in TE.

Main Methods:

  • dPAMAM-pDNA and PEI-pDNA polyplexes were formulated at specific mass ratios.
  • Gene delivery was tested on MSCs in monolayer culture.
  • Polyplexes were soak-loaded onto various collagen-based scaffolds (collagen alone, collagen-CS, collagen-hydroxyapatite, collagen-nanohydroxyapatite, collagen-hyaluronic acid) for 3D culture.

Main Results:

  • dPAMAM-pDNA polyplexes facilitated prolonged reporter gene expression in monolayer MSCs, outperforming PEI-pDNA polyplexes.
  • Soak-loaded dPAMAM-pDNA polyplexes on collagen-chondroitin sulphate (CS) scaffolds resulted in superior transgene expression compared to PEI-pDNA.
  • Transgene expression varied significantly across different collagen composite scaffolds, indicating scaffold-dependent delivery.

Conclusions:

  • dPAMAM serves as a biocompatible and effective gene delivery vector for TE applications.
  • The dPAMAM vector's performance can be optimized by matching it with specific composite scaffold types.
  • This tailored approach holds promise for regenerating diverse tissue defects.