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Related Concept Videos

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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: Dec 24, 2025

Gene Transfection toward Spheroid Cells on Micropatterned Culture Plates for Genetically-modified Cell Transplantation
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A core-shell structured polyplex for efficient and non-toxic gene delivery.

Saisai Wang1, Fei Wang, Qiang Zhang

  • 1Shanghai Key Laboratory of Regulatory Biology, School of Life Sciences, East China Normal University, Shanghai, P. R. China. qzhang@bio.ecnu.edu.cn yycheng@mail.ustc.edu.cn.

Journal of Materials Chemistry. B
|April 9, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel core-shell polyplex for gene therapy, achieving high transfection efficiency and low toxicity. This innovative approach utilizes a high-generation dendrimer core and a low-molecular-weight cationic polymer shell to overcome current limitations.

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Area of Science:

  • Biomaterials Science
  • Gene Therapy
  • Nanotechnology

Background:

  • Cationic polymers are crucial for gene delivery but face challenges balancing transfection efficacy with toxicity.
  • Developing safe and effective gene vectors remains a key hurdle in gene therapy applications.

Purpose of the Study:

  • To engineer a core-shell polyplex system to enhance gene transfection efficiency while minimizing cellular toxicity.
  • To investigate the structure-activity relationship of different dendrimer cores and cationic polymer shells in gene delivery.

Main Methods:

  • Synthesized core-shell polyplexes using varying generations of polyamidoamine (PAMAM) dendrimers as cores and low-molecular-weight linear polyethylenimine (LPEI), branched PEI, or G2 PAMAM as shell polymers.
  • Condensed plasmid DNA using a high-generation dendrimer at a low nitrogen/phosphorus (N/P) ratio, followed by shell polymer coating to modulate charge.
  • Evaluated transfection efficacy and cytotoxicity of the developed polyplexes in vitro.

Main Results:

  • The polyplex formed by G8 PAMAM dendrimer and LPEI (G8/LPEI/DNA) demonstrated superior transfection efficiency and significantly reduced toxicity at specific N/P ratios (core N/P = 0.25, shell N/P = 100).
  • Mechanism studies revealed that the G8/LPEI/DNA polyplex exhibits an incompact structure, promoting efficient DNA release within the cytoplasm.
  • Optimized core-shell architecture effectively balances the need for DNA condensation and controlled release.

Conclusions:

  • The developed G8 PAMAM/LPEI core-shell polyplex represents a promising strategy for achieving high-efficiency, low-toxicity gene delivery.
  • This approach offers an innovative solution to the long-standing challenge of balancing efficacy and safety in cationic polymer-based gene vectors.
  • The findings pave the way for advanced biomaterials in therapeutic gene transfection.