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Comparative endothelial cell response on topographically patterned titanium and silicon substrates with micrometer to
Prashanthi Vandrangi1, Shannon C Gott2, Ryan Kozaka3
1Department of Mechanical Engineering, University of California Riverside, Riverside, California, United States of America; Department of Bioengineering, University of California Riverside, Riverside, California, United States of America.
Smaller surface patterns on titanium (Ti) and silicon (Si) substrates improve endothelial cell (EC) adhesion, proliferation, and function. Sub-micrometer Ti patterns show the most promise for enhancing implantable microdevices.
Area of Science:
- Biomaterials Science
- Cell Biology
- Nanotechnology
Background:
- Endothelial cells (EC) are crucial for vascular health and implant integration.
- Surface topography influences cellular behavior, impacting biomaterial performance.
- Titanium (Ti) and silicon (Si) are common materials for implantable microdevices.
Purpose of the Study:
- To evaluate the in vitro response of endothelial cells (EC) to varying micro- and sub-micrometer surface topographies.
- To compare the effects of patterned Ti and Si substrates on EC behavior.
- To identify optimal surface features for enhancing endothelialization in implantable microdevices.
Main Methods:
- Fabrication of Ti and Si substrates with groove-based gratings (0.5–50 µm widths).
- In vitro culture of EA926 human endothelial cells on patterned substrates.
- Assessment of cellular adhesion, proliferation, morphology, and function.
Main Results:
- Decreasing feature size on patterned Ti substrates significantly improved EC adhesion, proliferation, morphology, and function.
- Similar positive trends were observed on patterned Si substrates, though to a lesser extent than Ti.
- Sub-micrometer topographic patterns demonstrated superior EC response compared to larger features.
Conclusions:
- Sub-micrometer topographic patterning shows significant promise for improving EC response.
- Patterned titanium (Ti) substrates, particularly with sub-micrometer features, are highly effective for enhancing endothelialization.
- These findings support the development of novel implantable microdevices with improved biocompatibility and performance.
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