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A Simplified System for Evaluating Cell Mechanosensing and Durotaxis In Vitro
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Stiffness assisted cell-matrix remodeling trigger 3D mechanotransduction regulatory programs.

Anna L Kersey1, Daniel Y Cheng1, Kaivalya A Deo1

  • 1Department of Biomedical Engineering, College of Engineering, Texas A&M University, College Station, TX 77843, USA.

Biomaterials
|February 9, 2024
PubMed
Summary

Engineered matrices reveal how stiffness influences cell behavior in 3D. Stiff hydrogels promote specific cell shapes and extracellular matrix remodeling via key signaling pathways.

Keywords:
BiomaterialsDisease modellingMechanotransductionRegenerative medicineThree-dimensional (3D) microenvironment

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Area of Science:

  • Biomaterials Science
  • Cellular Mechanobiology
  • Tissue Engineering

Background:

  • Engineered matrices are crucial for studying biophysical factor effects on cell behavior via mechanotransduction.
  • Understanding 3D mechanotransduction, particularly the role of matrix stiffness independent of other properties, remains a challenge.

Purpose of the Study:

  • To develop a method for independently altering matrix stiffness in 3D hydrogels.
  • To investigate how matrix stiffness influences human mesenchymal stem cell (hMSC) behavior and signaling in 3D.

Main Methods:

  • A nanoparticle crosslinker was used to reinforce collagen hydrogels, significantly increasing stiffness without changing composition, microstructure, viscoelasticity, or ligand density.
  • Encapsulated hMSCs in 3D hydrogels of varying stiffness (5 kPa vs. 30 kPa) were analyzed for morphology, ECM production, and signaling pathway activation.

Main Results:

  • hMSCs exhibited distinct morphologies: circular in soft gels and elongated in stiff gels.
  • Stiff hydrogels promoted extracellular matrix (ECM) production and remodeling.
  • Mechanotransduction pathways, including PI3K/Akt, epigenetic modifiers, and YAP/TAZ signaling, were activated in response to stiffness.

Conclusions:

  • This study presents a novel biomaterials platform for precisely controlling 3D matrix stiffness.
  • The findings elucidate the role of matrix stiffness in directing cell fate and mechanotransduction in 3D environments.
  • This platform has potential applications in regenerative medicine and disease modeling.