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Fabrication of biodegradable elastomeric scaffolds with sub-micron morphologies
John J Stankus1, Jianjun Guan, William R Wagner
1Department of Chemical Engineering, 100 Technology Drive, University of Pittsburgh, Pittsburgh, Pennsylvania 15219, USA.
Journal of Biomedical Materials Research. Part A
|August 13, 2004
Summary
Researchers created strong, flexible elastic matrices for soft tissue engineering by combining a synthetic polymer with collagen. These new biomaterials enhance cell adhesion, mimicking the natural extracellular matrix (ECM).
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Polymer Chemistry
Background:
- The native extracellular matrix (ECM) of elastic tissues provides strength, flexibility, and supports cell functions.
- Mimicking these ECM properties in synthetic scaffolds is crucial for soft tissue engineering applications.
Purpose of the Study:
- To develop biodegradable, elastomeric scaffolds that mimic the mechanical properties and cellular interactions of native elastic ECM.
- To investigate the effect of varying collagen ratios on scaffold properties and cell adhesion.
Main Methods:
- Biodegradable, elastomeric poly(ester urethane)urea (PEUU) was combined with type I collagen at various ratios (2.5-90 wt%).
- The PEUU-collagen mixtures were electrospun to create elastic matrices with randomly oriented fibers (100-900 nm diameter).
- Picrosirius red staining and CD spectroscopy confirmed collagen incorporation and structural integrity.
Main Results:
- The electrospun matrices exhibited high strength (2-13 MPa) and distensibility (160-280% breaking strain), even at low PEUU content.
- Collagen incorporation was confirmed, with its structure preserved at higher mass fractions.
- Smooth muscle cell adhesion was significantly enhanced on the collagen-containing scaffolds.
Conclusions:
- A novel approach successfully mimics elastic ECM properties using a synthetic component (PEUU) for mechanical function and a biomacromolecule (collagen).
- These engineered matrices demonstrate potential for soft tissue engineering applications due to their mechanical properties and ability to support cell adhesion.