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Related Experiment Video

Updated: Oct 14, 2025

Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications
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Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications

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Nucleic Acid Delivery from Granular Hydrogels.

Evan Kurt1, Tatiana Segura1,2

  • 1Department of Biomedical Engineering, Duke University, Durham, NC, 27708, USA.

Advanced Healthcare Materials
|November 6, 2021
PubMed
Summary
This summary is machine-generated.

This study presents injectable hydrogel microparticles for sustained nucleic acid delivery, overcoming limitations of traditional scaffolds for applications in gene therapy and tissue engineering.

Keywords:
DNA/PEI particlesFLIP hydrogelsgene deliverynonviralsporous

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Area of Science:

  • Biomaterials Science
  • Gene Delivery Systems
  • Regenerative Medicine

Background:

  • Nucleic acid delivery is crucial for applications like tissue engineering and vaccine development.
  • Current methods using cationic polymer condensed nucleic acids on scaffolds have limited loading capacity and non-injectable formulations.
  • Surface-coated scaffolds result in decreasing gene expression over time and are not suitable for injection.

Purpose of the Study:

  • To develop an injectable scaffold for sustained nucleic acid delivery.
  • To overcome the limitations of limited loading capacity and non-injectability in current nucleic acid delivery systems.
  • To achieve constant gene expression rates from an injectable porous hydrogel.

Main Methods:

  • Stabilizing cationic polymer condensed nucleic acids into a lyophilized powder.
  • Loading the powder into a bulk hydrogel and fragmenting it into microparticles.
  • Annealing the hydrogel microparticles post-injection to form an injectable microporous hydrogel.

Main Results:

  • Developed injectable granular hydrogel microparticles effectively delivering nucleic acids to embedded cells.
  • Achieved a constant gene expression rate over time, unlike surface-coated scaffolds.
  • Demonstrated the ability to create mixtures of loaded/unloaded particles for spatially resolved gene expression.

Conclusions:

  • Injectable granular hydrogel microparticles offer a novel platform for sustained nucleic acid delivery.
  • This technology overcomes limitations of traditional scaffolds, enabling long-term gene expression from injectable porous hydrogels.
  • The developed system broadens the scope of nucleic acid delivery applications, including advanced therapies.