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Related Concept Videos

Cell Adhesion Molecules - Types and Functions01:20

Cell Adhesion Molecules - Types and Functions

Cell adhesion molecules (CAMs) are pivotal to multicellularity and the coordinated functioning of tissues and organ systems. They enable physical interactions between cells and provide mechanical strength to tissues. They also function as receptors for signal transmission across the plasma membrane. The CAMs are broadly classified into four families - integrins, cadherins, selectins, and immunoglobulin-like CAMs (IgCAMs).
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Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering
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Photoreversible surfaces to regulate cell adhesion.

Alexis Goulet-Hanssens1, Karen Lai Wing Sun, Timothy E Kennedy

  • 1Department of Chemistry, Program in NeuroEngineering, McGill University, 801 Sherbrooke Street West, Montreal, Quebec, Canada H3A 0B8.

Biomacromolecules
|August 24, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a light-responsive cell culture substrate. This technology enhances cell adhesion and survival by adjusting surface properties with light, particularly in a

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Surface Chemistry

Background:

  • Cell culture substrates influence cell adhesion and survival.
  • Controlling substrate properties like stiffness and adhesivity is crucial for cell growth.
  • Existing methods for substrate modification are often invasive or lack precise control.

Purpose of the Study:

  • To develop a photoreversible cell culture substrate with light-tunable adhesivity.
  • To investigate the impact of light-induced changes in RGD peptide exposure on cell adhesion and survival.
  • To identify optimal substrate conditions for light-triggered enhancement of cell culture.

Main Methods:

  • Fabrication of tunable polyelectrolyte multilayer (PEM) substrates with varying thickness and stiffness.
  • Functionalization of PEM surfaces with azobenzene photoswitchable sidegroups linked to RGD peptides.
  • Irradiation with light to induce azo bond isomerization and alter RGD peptide presentation.
  • Quantification of cell adhesion and survival on modified substrates using NIH 3T3 cells.

Main Results:

  • Substrate stiffness significantly influenced NIH 3T3 cell adhesion.
  • Light-induced alteration of RGD peptide exposure enhanced cell adhesion and survival by up to 40% on softest substrates.
  • The greatest enhancement was observed under initially suboptimal cell culture conditions, defining a 'Goldilocks zone'.

Conclusions:

  • Photoreversible cell culture substrates offer a noninvasive method to modulate cell adhesion and survival.
  • Light-triggered modification of RGD peptide presentation is an effective strategy for enhancing cell culture.
  • The 'Goldilocks zone' concept is key for optimizing light-triggered enhancements in cell culture substrates.