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Related Concept Videos

Activation of Integrins01:15

Activation of Integrins

Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
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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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The modulation of MSC integrin expression by RGD presentation.

Jonathan Lam1, Tatiana Segura2

  • 1University of California Los Angeles, Bioengineering Department, USA.

Biomaterials
|March 8, 2013
PubMed
Summary

Clustering adhesion peptides like RGD within hyaluronic acid hydrogels significantly altered mouse mesenchymal stem cell behavior. This biomaterial design strategy influences cell spreading and integrin expression for better control.

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Area of Science:

  • Biomaterials science
  • Cell biology
  • Tissue engineering

Background:

  • Biomaterials mimicking the extracellular matrix (ECM) guide encapsulated cell behavior through various design parameters.
  • Common strategies include controlling material mechanics, incorporating bioactive signals, and spatial/temporal patterning of these signals.
  • Previous research on clustered adhesion peptides focused on cells seeded on top of biomaterials.

Purpose of the Study:

  • To investigate the effect of clustering the adhesion peptide RGD on encapsulated mouse mesenchymal stem cells within 3D hyaluronic acid hydrogels.
  • To determine if clustered bioactive signals influence cell behavior differently compared to non-clustered signals.

Main Methods:

  • Encapsulation of mouse mesenchymal stem cells within 3D hyaluronic acid hydrogels.
  • Incorporation of clustered adhesion peptide RGD within the hydrogel matrix.
  • Analysis of cell spreading and integrin expression in response to clustered RGD signals.

Main Results:

  • Clustering of the RGD adhesion peptide within hyaluronic acid hydrogels led to significant differences in encapsulated cell spreading.
  • Significant differences in integrin expression were observed in response to clustered RGD signals.
  • These findings highlight the impact of bioactive signal distribution on cell behavior.

Conclusions:

  • Bioactive signal clustering, specifically RGD peptides in hyaluronic acid hydrogels, is an effective biomaterial design parameter.
  • This approach can be used to influence and guide the behavior of encapsulated cells, including stem cells.
  • The spatial distribution of adhesion peptides offers a novel strategy for controlling cell responses in biomaterial applications.