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Modulation of cell proliferation and differentiation through substrate-dependent changes in fibronectin conformation
A J García1, M D Vega, D Boettiger
1Department of Microbiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA. andres.garcia@me.gatech.edu
Molecular Biology of the Cell
|March 9, 1999
Summary
Changes in fibronectin (Fn) conformation on different substrates alter integrin binding, controlling cell proliferation and differentiation. This demonstrates a versatile mechanism for biological and biotechnological applications.
Area of Science:
- Cell Biology
- Biomaterials Science
- Biotechnology
Background:
- Integrin-mediated cell adhesion to extracellular matrices is crucial for cell cycle progression and differentiation.
- Fibronectin (Fn) conformation is influenced by substrate properties, affecting cell behavior.
Purpose of the Study:
- To investigate how substrate-dependent fibronectin conformation modulates integrin binding.
- To determine the role of altered integrin binding in switching between cell proliferation and differentiation.
Main Methods:
- Fibronectin adsorption onto bacterial polystyrene, tissue culture polystyrene, and collagen substrates.
- Quantification of bound alpha5, beta1, alphav, and beta3 integrin subunits using biochemical methods.
- Assessment of C2C12 myoblast proliferation and differentiation via immunostaining for muscle-specific myosin.
Main Results:
- Fibronectin conformation varied across substrates, impacting alpha5beta1 integrin binding but not alphav or beta3.
- Cell proliferation levels on fibronectin-coated substrates followed the order: bacterial polystyrene > tissue culture polystyrene > collagen.
- Cell differentiation increased with substrate stiffness, requiring the RGD binding site and mediated by alpha5beta1 integrin.
Conclusions:
- Substrate-induced fibronectin conformational changes regulate integrin binding and dictate cell fate decisions between proliferation and differentiation.
- Distinct integrin-mediated signaling pathways control proliferation versus differentiation.
- This mechanism offers versatile control over cellular responses for biological and biotechnological applications.