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A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Macroporous hydrogels derived from aqueous dynamic phase separation.

Nicolas Broguiere1, Andreas Husch2, Gemma Palazzolo1

  • 1Tissue Engineering and Biofabrication Laboratory, Department of Health Sciences and Technology, ETH Zürich, Otto-Stern-Weg 7, 8093, Zürich, Switzerland.

Biomaterials
|February 18, 2019
PubMed
Summary
This summary is machine-generated.

Injectable macroporous hydrogels support neural regeneration. These novel materials promote neurite extension, synapse formation, and functional 3D neural networks with long-term stability.

Keywords:
BioengineeringBiomedicalBiomimeticsEngineeringHydrogelMacroporousMaterialsMicrostructuresNerveNetworksNeuralNeuronPorousTissue

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Area of Science:

  • Biomaterials Science
  • Neural Engineering
  • Polymer Chemistry

Background:

  • Developing advanced biomaterials is crucial for neural tissue engineering.
  • Existing materials often lack the necessary properties for effective neural regeneration.
  • Injectable and stable scaffolds are needed to support complex neural structures.

Purpose of the Study:

  • To present a novel method for generating injectable macroporous hydrogels.
  • To characterize the physical properties and potential applications of these hydrogels in neural engineering.
  • To evaluate the hydrogels' efficacy in supporting neural cell growth, network formation, and nerve repair.

Main Methods:

  • Utilized polyethylene glycol (PEG) step growth polymerization and phase separation to create macroporous hydrogels.
  • Encapsulated dorsal root ganglia (DRGs) and primary rat cortical neurons within the hydrogels.
  • Assessed neurite extension, cell viability, synapse formation, and electrophysiological properties.
  • Tested the hydrogels as conduit fillings in a rat sciatic nerve injury model.

Main Results:

  • Generated injectable macroporous hydrogels with tunable dimensions and interconnected pores.
  • Demonstrated rapid neurite extension from DRGs and high viability (>95%) of encapsulated cortical neurons.
  • Achieved fast neurite extension (≈100 μm/day) and synapse formation, creating stable 3D neural networks.
  • Confirmed normal electrophysiological properties in cultured hippocampal neurons and supported axonal growth in a nerve injury model.

Conclusions:

  • The developed macroporous hydrogels offer a promising platform for neural tissue engineering and regenerative medicine.
  • Their unique combination of injectability, tunable porosity, stability, and biocompatibility addresses key challenges in neural repair.
  • These materials show significant potential for applications including 3D neural network formation and peripheral nerve regeneration.