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Published on: September 28, 2016
Influence of structured wafer surfaces on the characteristics of Caco-2 cells
Iris Guell1, Heinz D Wanzenboeck, Sahar S Forouzan
1Department of Pharmaceutical Technology and Biopharmaceutics, Althanstrasse 14, Vienna, Austria.
Abstract:
Currently there is an increasing demand for high-throughput methods to identify and to verify the potential of new drug candidates. Cell-based microelectronic biosensors might be powerful tools for rapid screening assays. However, reliable cultivation of cells is influenced by the material characteristics and the surface topography of the wafers serving as growth supports. In order to investigate the influence of micropatterned structures on cell viability, Caco-2 cells were seeded on silicon wafers featuring trench/mesa patterns obtained by lithography and reactive ion etching. Besides determination of the cell growth pattern by electron microscopic inspection, the adherence of cells on different patterned silicon wafers and the formation of the tight junctional network was investigated. Microstructured trench/mesa patterns, especially their lateral distances, remarkably influenced the adhesion and proliferation behavior of Caco-2 cells. Lateral distances below the average cell diameter were easily overgrown by the cells, whereas dimensions above the average cell diameter increasingly limited cell proliferation. Notably increased cell growth was observed using trenches with a width of 10-20microm and a trench depth of around 35microm. All in all, the results of this study might improve the production of microstructured biosensors and open up new perspectives concerning the combination of biosensors and microfluidic systems.
Insights
Microstructured silicon wafers significantly impact cell growth for drug discovery. Optimal trench dimensions enhance cell adhesion and proliferation, advancing microelectronic biosensor development.
Area of Science:
- Biomaterials Science
- Cell Biology
- Microtechnology
Background:
- High-throughput drug candidate screening requires reliable cell-based assays.
- Cell-based microelectronic biosensors offer rapid screening potential.
- Cell cultivation is sensitive to material and surface topography of growth supports.
Purpose of the Study:
- To investigate the influence of micropatterned silicon wafer structures on cell viability and behavior.
- To optimize microstructured surfaces for improved cell adhesion, proliferation, and tight junction formation.
Main Methods:
- Caco-2 cells were seeded on lithographically and ion-etched silicon wafers with trench/mesa patterns.
- Cell growth patterns were analyzed using electron microscopy.
- Cell adhesion and tight junction network formation were assessed on patterned surfaces.
Main Results:
- Microstructured patterns, particularly lateral distances, significantly affected Caco-2 cell adhesion and proliferation.
- Pattern dimensions below average cell diameter led to overgrowth; dimensions above limited proliferation.
- Optimal cell growth was observed with trenches of 10-20 microm width and ~35 microm depth.
Conclusions:
- Micropatterned silicon surfaces can be tailored to control cell behavior for biosensor applications.
- Specific trench dimensions (10-20 microm width, ~35 microm depth) promote enhanced cell growth.
- Findings support the advancement of microelectronic biosensor production and microfluidic integration.
