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DNA Packaging00:58

DNA Packaging

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Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

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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Polymer Nano-Carrier-Mediated Gene Delivery: Visualizing and Quantifying DNA Encapsulation Using dSTORM.

Xhorxhina Shaulli1, Aura Maria Moreno-Echeverri2, Mariza Andoni1

  • 1Department of Physics, University of Fribourg, Chemin du Musée 3, Fribourg, CH 1700, Switzerland.

Small (Weinheim an Der Bergstrasse, Germany)
|November 18, 2024
PubMed
Summary
This summary is machine-generated.

Super-resolution microscopy precisely measures DNA encapsulation in gene therapy carriers. This breakthrough optimizes nano-carrier design for enhanced gene delivery systems.

Keywords:
DNA encapsulationcellular uptakedSTORMdrug deliverymicrogelspolyplex systemssuper‐resolution microscopy

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Area of Science:

  • Biotechnology
  • Materials Science
  • Cell Biology

Background:

  • Effective gene therapy relies on efficient gene encapsulation and delivery.
  • Quantifying gene loading into delivery carriers is a significant challenge.
  • Current methods lack precision in measuring encapsulation efficiency at the single-particle level.

Purpose of the Study:

  • To demonstrate the application of super-resolution microscopy for quantifying DNA encapsulation in nano-carriers.
  • To investigate the influence of various factors on encapsulation efficiency.
  • To assess the biocompatibility and cellular uptake of the developed gene delivery system.

Main Methods:

  • Utilized direct stochastic optical reconstruction microscopy (dSTORM) for high-resolution imaging.
  • Employed pNIPAM/bPEI microgels as model nano-carriers forming polyplexes with DNA.
  • Investigated encapsulation efficiency based on charge ratios, temperature-induced microgel transitions, DNA length, and shape.

Main Results:

  • Successfully visualized and quantified DNA entry into individual microgel carriers using dSTORM.
  • Demonstrated that encapsulation efficiency is dependent on charge ratio, DNA characteristics, and microgel properties.
  • Confirmed uptake of polyplexes by macrophages with good cell viability.

Conclusions:

  • dSTORM is a powerful tool for precise characterization of gene delivery carriers at the single-particle level.
  • This technique enables fine-tuning of polyplex microgel systems for optimized size, shape, and loading capacity.
  • The findings significantly advance the development of efficient and targeted gene delivery systems.