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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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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

Gene delivery using biodegradable polyelectrolyte microcapsules prepared through the layer-by-layer technique.

José L Santos1, Alireza Nouri, Tiago Fernandes

  • 1Centro de Química da Madeira (CQM), MMRG, Universidade da Madeira, Campus da Penteada, 9000-390 Funchal, Portugal. jlsantos@jhu.edu

Biotechnology Progress
|June 26, 2012
PubMed
Summary

Biodegradable microcapsules effectively deliver plasmid DNA (pDNA) for gene expression. Iron oxide nanoparticles enhance transfection efficiency, offering insights for gene therapy and vaccination strategies.

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Area of Science:

  • Biotechnology
  • Materials Science
  • Gene Delivery

Background:

  • Plasmid DNA (pDNA) is crucial for gene therapy and vaccination.
  • Efficient and safe delivery of pDNA into cells remains a challenge.
  • Microcapsule-based systems offer potential solutions for pDNA encapsulation and delivery.

Purpose of the Study:

  • To develop and evaluate biodegradable and non-biodegradable microcapsules for pDNA delivery.
  • To assess the impact of microcapsule biodegradability on gene expression.
  • To investigate the role of iron oxide nanoparticles in enhancing transfection efficiency.

Main Methods:

  • Layer-by-layer (LbL) technique used to fabricate microcapsules with specific polyelectrolyte pairs.
  • Encapsulation of plasmid DNA (pDNA) within both biodegradable and non-biodegradable microcapsules.
  • In vitro transfection of NIH 3T3 cells to assess gene expression.
  • Incorporation of iron oxide nanoparticles into microcapsule layers.

Main Results:

  • Encased pDNA retained its bioactivity.
  • A correlation was observed between polyelectrolyte biodegradability and in vitro gene expression levels.
  • Iron oxide nanoparticle incorporation significantly enhanced microcapsule transfection efficiency.
  • Biodegradable microcapsules demonstrated promise as a novel pDNA delivery system.

Conclusions:

  • Biodegradable microcapsules are effective for pDNA delivery and gene expression.
  • The biodegradability of polyelectrolytes influences gene expression outcomes.
  • Iron oxide nanoparticles represent a valuable addition for improving pDNA delivery systems.
  • These findings have implications for plasmid-based vaccination and gene therapy targeting phagocytic cells.