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Evaluation of Polymeric Gene Delivery Nanoparticles by Nanoparticle Tracking Analysis and High-throughput Flow Cytometry
08:51

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Published on: March 1, 2013

PEGylated peptide based reductive polycations as efficient nonviral gene vectors.

Juan Yang1, Hui-Yuan Wang, Wen-Jie Yi

  • 1Key Laboratory of Biomedical Polymers of Ministry of Education & Department of Chemistry, Wuhan University, Wuhan 430072, China.

Advanced Healthcare Materials
|November 28, 2012
PubMed
Summary

New reducible polycations (RPCs) show reduced toxicity and enhanced gene delivery compared to traditional polyethyleneimine (PEI) vectors. These peptide-based nonviral gene vectors offer a promising alternative for in vivo applications.

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Published on: October 26, 2018

Area of Science:

  • Biomaterials Science
  • Gene Therapy
  • Nanotechnology

Background:

  • Gene delivery faces critical barriers, including cytotoxicity and low transfection efficiency of existing nonviral vectors.
  • Polyethyleneimine (PEI) and its PEGylated forms (PEI-mPEG) are common but have limitations.

Purpose of the Study:

  • To synthesize and evaluate novel reducible polycations (RPCs) based on low molecular weight (LMW) peptides as nonviral gene vectors.
  • To compare the cytotoxicity and gene delivery performance of RPCs against PEI and PEI-mPEG.

Main Methods:

  • Synthesis of RPCs (PolyHK6 H) with varying poly(ethylene glycol) (PEG) contents (PolyHK6 H-mPEG1, -mPEG2, -mPEG3).
  • Evaluation of cytotoxicity, DNA binding and condensation (pDNA), particle size, and in vitro transfection efficiency.
  • Comparison with 25 kDa PEI and PEI-mPEG (PEI-mPEG1, -mPEG2, -mPEG3).

Main Results:

  • All RPCs demonstrated lower cytotoxicity than PEI and PEI-mPEG.
  • PolyHK6 H-mPEG1 and PolyHK6 H-mPEG2 efficiently condensed pDNA into ~200 nm particles.
  • RPCs showed significantly higher transfection efficiency than PEI, especially in serum-supplemented media.
  • PolyHK6 H-mPEG1 achieved transfection efficiency comparable to optimal PEI-mPEG1 but with substantially lower cytotoxicity.

Conclusions:

  • Reducible polycations (RPCs) offer a safer and more effective nonviral gene delivery system.
  • The disulfide bonds in RPCs enhance complex stability extracellularly and facilitate pDNA release intracellularly.
  • PEGylated RPCs exhibit improved intracellular gene transfer, indicating strong potential for in vivo applications.