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Related Concept Videos

Modified-Release Drug Delivery Systems: Rate-Programmed II01:19

Modified-Release Drug Delivery Systems: Rate-Programmed II

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Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
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Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also...
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Related Experiment Video

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Fibrin Hydrogels Reinforced by Reactive Microgels for Stimulus-Triggered Drug Administration.

Miriam Aischa Al Enezy-Ulbrich1,2, Thomke Belthle1,2, Hanna Malyaran3,4

  • 1Institute for Technical and Macromolecular Chemistry, Research Area Functional and Interactive Polymers, RWTH Aachen University, Worringerweg 1, 52074, Aachen, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|June 20, 2024
PubMed
Summary

This study developed advanced fibrin-based hydrogels reinforced with functional microgels for tissue engineering. These materials offer enhanced mechanical properties, controlled drug release, and excellent biocompatibility, paving the way for regenerative medicine applications.

Keywords:
dexamethasonedrug‐deliveryfibrinhydrogelsmicrogels

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Polymer Chemistry

Background:

  • Tissue engineering requires scaffolds with specific mechanical properties, biocompatibility, and functionality.
  • Fibrin-based hydrogels are promising but often need reinforcement to meet application demands.

Purpose of the Study:

  • To evaluate fibrin-based hydrogels reinforced with functional, temperature-responsive poly(N-vinylcaprolactam)-based (PVCL) microgels.
  • To investigate the impact of microgel properties and concentration on hydrogel performance.
  • To assess the potential for drug delivery and cytocompatibility.

Main Methods:

  • Fabrication and characterization of PVCL microgels with epoxy functionalization.
  • Reinforcement of fibrin hydrogels with varying PVCL microgel concentrations and cross-linking degrees.
  • Rheological analysis to determine mechanical properties.
  • LIVE/DEAD staining for cytocompatibility assessment with human mesenchymal stem cells.
  • Drug release studies using dexamethasone and bioassays.

Main Results:

  • Mechanical properties of hydrogels strongly correlate with microgel rigidity and concentration.
  • Microgels act as cross-links, imparting temperature-responsiveness and reducing degradation.
  • Demonstrated triggered release of dexamethasone from microgel carriers.
  • Confirmed cytocompatibility of the reinforced hydrogels with human mesenchymal stem cells.

Conclusions:

  • Microgel-reinforced fibrin-based hydrogels exhibit superior mechanical performance and stability.
  • These materials offer tunable properties, drug delivery capabilities, and retained biocompatibility.
  • The developed hydrogels represent a promising advancement for tissue engineering and regenerative medicine.