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Silicon Microchips for Manipulating Cell-cell Interaction
Published on: August 30, 2007
Selective modulation of cell response on engineered fractal silicon substrates
Francesco Gentile1, Rebecca Medda, Ling Cheng
1BioNEM - Center of BioNanotechnology and Engineering for Medicine, University of Magna Graecia, Italy.
Scientific Reports
|March 16, 2013
Summary
Randomly rough surfaces can control cell behavior. Moderate roughness and high fractal dimension promote cell proliferation, while higher roughness and lower fractal dimension enhance cell adhesion structures.
Area of Science:
- Biomaterials Science
- Cell Biology
- Surface Science
Background:
- The natural cell microenvironment features biomechanical cues across multiple scales.
- Previous studies focused on ordered topographical features, neglecting random surface characteristics.
Purpose of the Study:
- To investigate the impact of randomly rough, self-affine fractal surfaces on fibroblast behavior.
- To independently control surface roughness (Ra) and fractal dimension (Df) to modulate cell responses.
Main Methods:
- Fabrication of silicon substrates with independently controlled roughness (Ra) and fractal dimension (Df).
- Monitoring of proliferation rates, adhesion structure formation, and morphology of 3T3 murine fibroblasts on six different substrates.
Main Results:
- Cell proliferation rate was maximized on surfaces with moderate roughness (Ra ~ 40 nm) and high fractal dimension (Df ~ 2.4).
- Adhesion structures were wider and more stable on substrates with higher roughness (Ra ~ 50 nm) and lower fractal dimension (Df ~ 2.2).
- Densely packed, sharp peaks promoted higher proliferation, while regular ridges favored adhesion.
Conclusions:
- Randomly rough topographies can selectively modulate fibroblast proliferation and adhesion.
- Surface characteristics like roughness and fractal dimension are critical in dictating cell behavior on biomaterials.
