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Preparation of 3D Fibrin Scaffolds for Stem Cell Culture Applications
Published on: March 2, 2012
Surface structural conformations of fibrinogen polypeptides for improved biocompatibility
Mohammed Yaseen1, Xiubo Zhao, Amy Freund
1School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
Biomaterials
|February 16, 2010
Summary
Incorporating silica nanocages into polyurethane surfaces alters protein adsorption and cell behavior. This surface modification influences fibrinogen conformation, impacting HeLa cell attachment and proliferation for biomedical applications.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Cell Biology
Background:
- Polyurethane (PU) copolymers are widely used in biomedical applications.
- Understanding protein-surface interactions is crucial for designing biocompatible materials.
- Fibrinogen adsorption and conformation significantly influence cellular responses.
Purpose of the Study:
- To investigate the effect of silica nanocage incorporation into PU on fibrinogen adsorption and conformation.
- To determine how these surface modifications influence HeLa cell attachment and proliferation.
- To correlate protein conformation with cellular behavior on modified surfaces.
Main Methods:
- Atomic Force Microscopy (AFM) for surface topography and protein network analysis.
- Spectroscopic ellipsometry to probe dynamic interfacial adsorption and protein conformation.
- Monoclonal antibody binding assays to characterize specific protein chain exposure.
- Cell attachment and proliferation assays using HeLa cells.
Main Results:
- Silica nanocages (2 wt%) altered PU surface topography, with nanocages covering ~50% of the surface.
- Fibrinogen adsorption was reduced on nanocage domains, favoring trinodular structures, while dense networks formed on PU domains.
- Distinct fibrinogen conformations were observed on nanocage-modified (PU4) versus unmodified (PUA) surfaces, with altered alpha and gamma chain exposure.
- Cell attachment and proliferation showed a strong preference for surfaces with greater gamma chain exposure.
Conclusions:
- Silica nanocage incorporation into PU significantly modifies surface properties and protein adsorption behavior.
- Surface-induced fibrinogen conformation dictates cellular responses, highlighting the importance of surface chemistry and topography.
- These findings provide insights for designing advanced biomaterials with controlled cellular interactions.
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