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Related Concept Videos

Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

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Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...
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After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt secretion,...
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Related Experiment Video

Updated: Apr 12, 2026

Generation of Cationic Nanoliposomes for the Efficient Delivery of In Vitro Transcribed Messenger RNA
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Biocompatible anionic polyelectrolyte for improved liposome based gene transfection.

Ming Chen1, Zhiying Zeng1, Xiaohuan Qu1

  • 1Innovative Drug Research Centre, Chongqing University, Chongqing 401331, China.

International Journal of Pharmaceutics
|May 26, 2015
PubMed
Summary

Researchers developed new, safer gene carriers by coating cationic liposomes with anionic polymers. These novel carriers reduce cytotoxicity while maintaining high gene transfection efficiency, showing promise for clinical gene delivery.

Keywords:
Anionic polyelectrolyteBiocompatibilityEndosomal escapeGene transfectionLiposome

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Area of Science:

  • Biotechnology
  • Materials Science
  • Molecular Biology

Background:

  • Cationic liposomes are effective gene carriers but cause cytotoxicity due to positive charges.
  • Developing biocompatible, non-positive charge gene carriers with high transfection efficiency is challenging.

Purpose of the Study:

  • To design novel, biocompatible gene carriers with reduced cytotoxicity and maintained high transfection efficiency.
  • To investigate the potential of anionic polyelectrolyte-coated liposomes for gene delivery.

Main Methods:

  • Coating cationic liposome/pDNA complexes with anionic polyelectrolytes: alginic acid, hyaluronic acid, pectin, and polyglutamic acid.
  • Evaluating cytotoxicity and gene transfection efficiency in HepG2 and MCF-7 cells.
  • Assessing the mechanism of DNA escape using hemolysis assay.

Main Results:

  • Anionic polyelectrolyte coating significantly reduced the cytotoxicity of liposome/pDNA complexes.
  • Polyglutamic acid coating enhanced transfection efficiency in HepG2 cells.
  • Pectin coating increased transfection efficiency in MCF-7 cells.
  • Hemolysis assay suggests enhanced endosomal escape due to increased hydrophobicity at lower pH.

Conclusions:

  • Anionic polyelectrolyte-coated liposomes offer a promising strategy for safer and effective clinical gene delivery.
  • The choice of anionic polyelectrolyte can be optimized for specific cell types and transfection goals.