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Fluorinated surface-modifying macromolecules: modulating adhesive protein and platelet interactions on a
A R Jahangir1, W G McClung, R M Cornelius
1Department of Biological and Diagnostic Sciences, Faculty of Dentistry, University of Toronto, Toronto, Canada.
Journal of Biomedical Materials Research
|February 9, 2002
Summary
Fluorinated surface-modifying macromolecules (SMMs) improve polyether-urethanes (PEUs) for blood-contacting devices. These SMM-modified PEUs show reduced protein adsorption and platelet activation, indicating lower thrombogenic potential for in vivo applications.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Medical Device Engineering
Background:
- Polyether-urethanes (PEUs) are widely used in blood-contacting devices.
- Biostability and blood compatibility remain key challenges for long-term PEU applications.
- Fluorinated surface-modifying macromolecules (SMMs) have shown potential in reducing PEU degradation and modulating protein adsorption.
Purpose of the Study:
- To evaluate the blood compatibility of polyether-urethanes (PEUs) modified with fluorinated surface-modifying macromolecules (SMMs).
- To investigate the effects of SMM modification on protein adsorption and platelet interactions with PEU surfaces.
Main Methods:
- In vitro experiments were conducted to study protein adsorption from plasma onto PEU substrates.
- Western blot analysis and single protein studies were used to quantify adsorption of key adhesive proteins (fibrinogen, fibronectin, vitronectin).
- Platelet adhesion, activation, and morphology were assessed on unmodified and SMM-modified PEU surfaces.
Main Results:
- SMM-modified PEUs exhibited significantly lower adsorption of fibrinogen, fibronectin, and vitronectin compared to unmodified PEUs.
- Platelet adhesion was reduced on SMM-modified surfaces, with lower platelet densities observed on substrates showing minimal protein adsorption.
- Platelets on SMM-modified surfaces demonstrated significantly less activation and normal morphology.
Conclusions:
- Fluorinated SMMs show promise for developing PEU surfaces with reduced thrombogenic character.
- SMM modification of PEUs can enhance blood compatibility by minimizing adhesive protein adsorption and platelet activation.
- These findings suggest potential for improved in vivo performance of blood-contacting devices utilizing SMM-modified PEUs.