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Related Concept Videos

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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Related Experiment Video

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Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo
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Surface-Driven Collagen Self-Assembly Affects Early Osteogenic Stem Cell Signaling.

Tojo Razafiarison1,2, Unai Silván1,2, Daniela Meier1

  • 1Department of Orthopedics, Balgrist University Hospital, University of Zurich, Lengghalde 5, 8008, Zürich, Switzerland.

Advanced Healthcare Materials
|April 30, 2016
PubMed
Summary

Surface properties significantly influence how stem cells differentiate. Controlling nanoscale architecture of extracellular matrix (ECM) ligands on biomaterials drives stem cell behavior and osteogenic differentiation.

Keywords:
collagen monomerhydrophobicitynanotopographical cuepolydimethylsiloxanestem cell

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Area of Science:

  • Biomaterials Science
  • Stem Cell Biology
  • Surface Chemistry

Background:

  • Extracellular matrix (ECM) ligand self-assembly on biomaterials influences stem cell behavior.
  • Nanoscale architecture of biomaterial surfaces is critical for cell response.
  • Surface wettability affects protein deposition, folding, and ligand activity.

Purpose of the Study:

  • To investigate how surface wettability of polydimethylsiloxane (PDMS) affects collagen assembly.
  • To determine the impact of altered collagen assembly on human bone marrow stromal cell behavior.
  • To elucidate the role of surface-driven ligand assembly in stem cell differentiation.

Main Methods:

  • Developed a PDMS-based platform to tune substrate wettability while maintaining constant topology, ligand loading, and mechanical properties.
  • Characterized collagen type I monomer assembly on hydrophobic versus hydrophilic PDMS surfaces.
  • Performed cellular and molecular investigations using human bone marrow stromal cells.

Main Results:

  • Hydrophobic PDMS surfaces resulted in rough collagen aggregate layers, while hydrophilic surfaces produced smooth collagen layers.
  • Human bone marrow stromal cells exhibited higher osteogenic differentiation on smooth collagen layers.
  • Surface-driven collagen assembly modulated α1β1 integrin/discoidin domain receptor 1 signaling and ERK/MAPK pathway activation.

Conclusions:

  • Surface wettability dictates ECM ligand assembly, influencing nanoscale architecture.
  • Surface-driven ligand assembly is a dominant factor in biomaterial-mediated stem cell response.
  • Controlling surface properties can direct stem cell differentiation towards osteogenesis.