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Related Experiment Video

Updated: May 29, 2026

Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications
09:39

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

Published on: February 7, 2021

Injectable thermoreversible hyaluronan-based hydrogels for nucleus pulposus cell encapsulation.

Marianna Peroglio1, Sibylle Grad, Derek Mortisen

  • 1AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos Platz, Switzerland.

European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society
|August 30, 2011
PubMed
Summary

Thermoreversible hyaluronan-based hydrogels (HA-pNIPAM) effectively carry nucleus pulposus cells (NPC) for spine repair. These injectable HA-pNIPAM hydrogels maintain NPC viability, phenotype, and promote extracellular matrix generation.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Spine Research

Background:

  • Thermoreversible hydrogels offer easy injectability and mild gelling for spine research.
  • Hyaluronan-based hydrogels (HA-pNIPAM) are explored as potential carriers for nucleus pulposus cells (NPC).

Purpose of the Study:

  • To assess the potential of HA-pNIPAM hydrogels as an injectable carrier for bovine NPC.
  • To evaluate NPC viability, morphology, extracellular matrix synthesis, and gene expression within HA-pNIPAM.

Main Methods:

  • Bovine NPC were cultured in HA-pNIPAM hydrogels (varying pNIPAM molecular weights).
  • Assessed cytocompatibility, viability, morphology, glycosaminoglycan synthesis, and gene expression.
  • Compared HA-pNIPAM to alginate bead cultures and evaluated injectability and ex vivo cell survival.

Main Results:

  • HA-pNIPAM hydrogels were cytocompatible, maintaining NPC viability and rounded morphology.
  • Glycosaminoglycan synthesis and NPC redifferentiation were comparable to alginate.
  • HA-pNIPAM demonstrated injectability and maintained NPC viability ex vivo for one week.

Conclusions:

  • A suitable HA-pNIPAM composition was identified for nucleus pulposus repair.
  • This hydrogel serves as an injectable carrier, preserving NPC phenotype.
  • HA-pNIPAM promotes extracellular matrix generation for potential spine regeneration.