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Related Concept Videos

Overview of Cell-Matrix Interactions01:24

Overview of Cell-Matrix Interactions

The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
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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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Control of Cell Adhesion using Hydrogel Patterning Techniques for Applications in Traction Force Microscopy
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Cell adhesion on an artificial extracellular matrix using aptamer-functionalized PEG hydrogels.

Niancao Chen1, Zhaoyang Zhang, Boonchoy Soontornworajit

  • 1Program of Biomedical Engineering, School of Engineering, University of Connecticut, Storrs, CT 06269-3222, USA.

Biomaterials
|November 15, 2011
PubMed
Summary
This summary is machine-generated.

Nucleic acid aptamers functionalized polyethylene glycol (PEG) hydrogels to mimic the extracellular matrix (ECM), promoting cell-specific adhesion without impacting viability. These aptamer-functionalized hydrogels show promise for regenerative medicine applications.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • The extracellular matrix (ECM) is crucial for regulating cell behavior in regenerative medicine.
  • Developing artificial ECMs requires mimicking the ECM's complex cell-interactive functions.
  • Nucleic acid aptamers offer a versatile tool for biomolecule-surface functionalization.

Purpose of the Study:

  • To functionalize polyethylene glycol (PEG) hydrogels with nucleic acid aptamers.
  • To create an artificial ECM that mimics native cell adhesion sites.
  • To evaluate the impact of aptamer functionalization on hydrogel properties and cell behavior.

Main Methods:

  • Incorporation of nucleic acid aptamers into PEG hydrogels via free radical polymerization.
  • Assessment of hydrogel mechanical properties post-functionalization.
  • Evaluation of cell type-specific adhesion, viability, and functional dependencies (aptamer concentration, spacer length, seeding time).

Main Results:

  • Aptamer incorporation had a moderate effect on PEG hydrogel mechanical properties.
  • Aptamer-functionalized hydrogels induced significant, cell type-specific adhesion.
  • Cell adhesion was controllable by aptamer concentration, spacer length, and seeding time, and could be attenuated by aptamer inactivation.

Conclusions:

  • Nucleic acid aptamer-functionalized PEG hydrogels effectively mimic ECM adhesion sites.
  • These biomaterials support cell type-specific adhesion while maintaining cell viability.
  • Aptamer-functionalized hydrogels represent a promising platform for artificial ECM development in regenerative medicine.