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Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications
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Multiresponsive hyaluronan-p(NiPAAm) "click"-linked hydrogels.

Sharad K Pasale1, Barbara Cerroni, Shivkumar V Ghugare

  • 1Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma "Tor Vergata", Via della Ricerca Scientifica, 00133, Rome, Italy.

Macromolecular Bioscience
|April 8, 2014
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Summary

This study combines reversible addition-fragmentation chain transfer (RAFT) and click chemistry to create multi-responsive polymer networks. These novel hyaluronic acid-based hydrogels show potential for localized drug delivery and tissue engineering scaffolds.

Keywords:
RAFT polymerizationclick chemistrycontrolled drug deliveryhyaluronic acidhydrogels

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Area of Science:

  • Polymer Chemistry
  • Biomaterials Science
  • Nanotechnology

Background:

  • Developing advanced materials with tunable properties is crucial for applications in drug delivery and regenerative medicine.
  • Hyaluronic acid (HA) is a biocompatible biopolymer with inherent biological relevance, making it an attractive component for biomaterials.
  • Stimuli-responsive hydrogels offer dynamic control over drug release and cellular interactions.

Purpose of the Study:

  • To synthesize and characterize a novel hybrid polymer network using a combination of RAFT polymerization and click chemistry.
  • To investigate the multi-stimuli responsive behavior (temperature, pH, ionic strength) of the developed hydrogel system.
  • To evaluate the potential of these hybrid hydrogels as scaffolds for cell culture and localized drug delivery applications.

Main Methods:

  • Synthesis of telechelic poly(N-isopropylacrylamide) (pNIPAAm) via RAFT polymerization.
  • Functionalization of hyaluronic acid with azide groups.
  • Chemoselective click chemistry conjugation between azido-hyaluronate and propargyl-terminated pNIPAAm.
  • Characterization of hydrogel network formation and stimuli-responsive properties.
  • In vitro cell culture studies using HT-29 tumor cells and NIH3T3 fibroblasts.

Main Results:

  • Successfully assembled a hybrid network of hyaluronic acid and pNIPAAm using click chemistry.
  • The hybrid hydrogel exhibited simultaneous and independent responses to temperature, pH, and ionic strength.
  • The hydrogels demonstrated tunable degradation profiles, mimicking extracellular matrix turnover.
  • Enhanced growth of HT-29 tumor cells compared to NIH3T3 cells on the hydrogel surface was observed.

Conclusions:

  • The developed hybrid hydrogel system offers a versatile platform for creating multi-responsive biomaterials.
  • The observed cell-selective growth and tunable degradation highlight the potential for advanced tissue engineering scaffolds.
  • This hyaluronic acid-based system presents a promising avenue for developing localized drug delivery systems and micro/nanodevices.