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Related Experiment Video

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Construction of Modular Hydrogel Sheets for Micropatterned Macro-scaled 3D Cellular Architecture
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Composite alginate gels for tunable cellular microenvironment mechanics.

Adele Khavari1,2, Magnus Nydén1,3, David A Weitz4

  • 1Applied Chemistry, Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.

Scientific Reports
|August 4, 2016
PubMed
Summary

Cellular microenvironment stiffness significantly impacts cell growth and morphology. Stiffer hydrogels, mimicking cancerous tissue, promote larger and faster multicellular aggregate growth, highlighting mechanics

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Tissue Engineering

Background:

  • Cell behavior is influenced by both the mechanical properties and biochemistry of the cellular microenvironment.
  • Evaluating mechanical and biochemical effects independently in 3D biopolymer matrices is challenging.
  • Existing biomaterials often lack independent tunability of mechanical and biochemical cues.

Purpose of the Study:

  • To develop 3D sodium alginate hydrogels with independently tunable stiffness and biochemical composition.
  • To investigate the independent effects of mechanical stiffness and binding factors (RGD, collagen) on multicellular aggregate (MCA) growth.
  • To correlate hydrogel stiffness with physiological tissue stiffness ranges.

Main Methods:

  • Fabrication of 3D sodium alginate hydrogels with a physiological range of stiffness (1.85–5.29 kPa).
  • Incorporation of RGD binding sites and collagen fibers into hydrogels.
  • Culturing of multicellular aggregates (MCAs) with varying metastatic potential within the hydrogels.
  • Quantification of MCA growth and morphology using confocal microscopy.

Main Results:

  • Hydrogel stiffness significantly regulates MCA growth and morphology.
  • MCAs exhibited larger and faster growth in stiffer hydrogels (4–12 kPa), mimicking cancerous breast tissue, compared to softer hydrogels (0.4–2 kPa) resembling healthy tissue.
  • Addition of RGD peptides and collagen fibers increased MCA growth rates and altered maximum sizes.
  • Mechanical confinement in stiffer microenvironments promotes cell proliferation.

Conclusions:

  • Independently tunable 3D hydrogels are valuable tools for studying cell-matrix interactions.
  • Mechanical properties of the cellular microenvironment play a critical role in regulating cell proliferation and aggregate formation.
  • Stiffness of the microenvironment is a key factor in promoting cancer progression and metastasis.