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Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

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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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Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
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Peptide-functionalized chitosan-DNA nanoparticles for cellular targeting.

Elina Talvitie1, Jenni Leppiniemi2, Andrey Mikhailov3

  • 1Department of Biomedical Engineering, Tampere University of Technology, FI-33101 Tampere, Finland; BioMediTech, FI-33520 Tampere, Finland.

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Summary

Researchers developed targeted chitosan-pDNA nanoparticles for gene delivery. Peptide-functionalized nanoparticles effectively targeted specific cells, enhancing delivery efficiency.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Gene Therapy

Background:

  • Chitosan-pDNA nanoparticles are promising for gene delivery.
  • Targeting nanoparticles to specific cells remains a challenge.

Purpose of the Study:

  • To functionalize chitosan-pDNA nanoparticles with TrkB-binding peptides for targeted gene delivery.
  • To evaluate the effect of nanoparticle properties and functionalization on cellular targeting and attachment.

Main Methods:

  • Chitosan-pDNA nanoparticles were prepared at various weight ratios and characterized.
  • Nanoparticles were functionalized with fluorescent dye and TrkB-binding peptides.
  • Targetability was assessed in TrkB-positive RAW 264 cells.

Main Results:

  • Increasing chitosan:pDNA weight ratio decreased particle size and increased zeta potential.
  • TrkB-peptide functionalization significantly enhanced cellular binding compared to control peptides.
  • PEG spacer arm length correlated positively with cellular attachment efficiency.

Conclusions:

  • Peptide functionalization enables targeted delivery of chitosan-pDNA nanoparticles.
  • This approach offers potential for specific cell targeting in gene therapy applications.