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Preparation of Hydroxy-PAAm Hydrogels for Decoupling the Effects of Mechanotransduction Cues
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Hydrogels with Reversible Mechanics to Probe Dynamic Cell Microenvironments.

Adrianne M Rosales1,2, Sebastián L Vega3, Frank W DelRio4

  • 1Department of Chemical and Biological Engineering, BioFrontiers Institute, University of Colorado, Boulder, Boulder, CO, 80309, USA.

Angewandte Chemie (International Ed. in English)
|August 12, 2017
PubMed
Summary

Researchers developed dynamic hyaluronic acid hydrogels that can change stiffness. This allows for studying how cells respond to changing mechanical environments, revealing insights into cell signaling and behavior.

Keywords:
gelshyaluronic acidmatrix mechanicsphotochemistrystem cells

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Tissue Engineering

Background:

  • Cell behavior is influenced by the mechanical properties of the extracellular matrix (ECM).
  • Existing in vitro substrates are typically static and unnaturally stiff, limiting studies of dynamic cell-matrix interactions.
  • There is a need for platforms that allow for controlled, dynamic changes in substrate mechanics.

Purpose of the Study:

  • To develop dynamic and reversible hyaluronic acid-based hydrogel substrates.
  • To investigate the effects of dynamically changing substrate stiffness on cell behavior and signaling.
  • To create a tunable platform for studying mechanotransduction in a physiologically relevant range.

Main Methods:

  • Fabrication of hyaluronic acid hydrogels with sequential photodegradation and photoinitiated crosslinking capabilities.
  • Modulation of hydrogel stiffness over a physiologically relevant range (e.g., 3.5 kPa to 28 kPa).
  • Culturing human mesenchymal stem cells on the dynamic hydrogels and assessing cell area and YAP/TAZ nuclear localization.

Main Results:

  • The developed hydrogels demonstrated reversible changes in stiffness through photoreactions.
  • Hydrogel softening (14 kPa to 3.5 kPa) decreased human mesenchymal stem cell area and YAP/TAZ nuclear localization.
  • Subsequent hydrogel stiffening (3.5 kPa to 28 kPa) increased cell area and YAP/TAZ nuclear localization.
  • Photoreactions were cytocompatible and tunable.

Conclusions:

  • Hyaluronic acid-based hydrogels can be dynamically tuned in stiffness using light-activated reactions.
  • Dynamic mechanical cues significantly influence cell morphology and YAP/TAZ signaling pathways.
  • This platform enables the study of dynamic cell-matrix interactions and mechanobiology across various cell types.