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Fabrication of Gradient Nanopattern by Thermal Nanoimprinting Technique and Screening of the Response of Human Endothelial Colony-forming Cells
Published on: July 1, 2018
Orthogonal nanometer-micrometer roughness gradients probe morphological influences on cell behavior.
Christian Zink1, Heike Hall, Don M Brunette
1Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093 Zürich, Switzerland.
Biomaterials
|August 7, 2012
Summary
Researchers created 2D surface roughness gradients to study cell responses. High micrometer roughness with intermediate nanofeature density significantly increased osteopontin production by osteoblasts, indicating optimized surface properties for bone regeneration.
Area of Science:
- Materials Science
- Cell Biology
- Biotechnology
Background:
- Surface properties critically influence cellular behavior and tissue regeneration.
- Systematic investigation of surface parameters like roughness is essential for optimizing biomaterials.
- Existing methods lack the ability to create controlled, multi-scale roughness gradients.
Purpose of the Study:
- To develop and characterize two-dimensional (2D) surface roughness gradients.
- To investigate the impact of combined micro- and nano-scale roughness on osteoblast behavior.
- To establish a replica technique for reproducible cell culture assays on gradient surfaces.
Main Methods:
- Fabrication of 2D roughness gradients by combining micro-featured roughness and nanoparticle density gradients.
- Characterization using Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), and optical profilometry.
- Application of Fourier-transform analysis for wavelength-dependent topography assessment.
- Utilizing replica molding for creating epoxy resin copies for cell studies.
Main Results:
- Successful fabrication and characterization of 2D roughness gradients with defined roughness parameters (Ra).
- Demonstrated significant influence of surface roughness on osteoblast differentiation markers.
- Identified optimal conditions: high micrometer roughness with 30-40 features/μm² nanofeature density for maximal osteopontin production.
Conclusions:
- Surface roughness gradients are effective tools for high-throughput cell biology investigations.
- Osteoblast response is highly sensitive to combined micro- and nano-scale surface topography.
- Optimized surface roughness parameters can enhance osteogenesis marker production, with implications for bone tissue engineering.
