Cell attachment on microscopically textured silicon surfaces

Stephen W. Turner; Lance Kam; Michael Isaacson; Harold G. Craighead; Donald H. Szarowski; James N. Turner; W. Shain

doi:10.1117/12.269978

31 March 1997 Cell attachment on microscopically textured silicon surfaces

Stephen W. Turner, Lance Kam, Michael Isaacson, Harold G. Craighead, Donald H. Szarowski, James N. Turner, W. Shain

Proceedings Volume 2978, Micro- and Nanofabricated Electro-Optical Mechanical Systems for Biomedical and Environmental Applications; (1997) https://doi.org/10.1117/12.269978
Event: BiOS '97, Part of Photonics West, 1997, San Jose, CA, United States

Abstract

To assess the effect of surface topography on cell attachment, central nervous system (astroglial cells) cells were grown on surfaces patterned with two different types of texture. Reactive ion etching (RIE) was used to induce nanometer-scale roughness in silicon wafers. In a subsequent wet etch, photo-patterned resist protected selected areas of the surface, resulting in a pattern of modified and unmodified texture. Scanning electron microscopy (SEM) showed that the RIE-roughened 'primary' surface consists of randomly positioned columnar structures (diameter approximately equals 50 nm, height approximately equals 250 nm). The wet-etched 'secondary' surfaces had shorter and more sparsely distributed projections, controlled to a degree by wet etch duration. Confocal microscopy and SEM demonstrated that transformed astroglial (LRM55) cells preferred secondary surfaces. The morphology of cells on secondary surfaces depended on wet etch duration. with brief wet etch, cells hade stellate or mounded morphology and were not closely adherent to the surface. With long wet etch, cells had an epithelial-like morphology and were closely adherent to substrates. Under all conditions, cells discriminated between primary and secondary surfaces. In contrast to LRM55 cells, astrocytes in primary cell culture preferred primary surfaces. Thus changes in surface topography produce cell-specific selectivity and change cell attachment characteristics.

Citation Download Citation

Stephen W. Turner, Lance Kam, Michael Isaacson, Harold G. Craighead, Donald H. Szarowski, James N. Turner, and W. Shain "Cell attachment on microscopically textured silicon surfaces", Proc. SPIE 2978, Micro- and Nanofabricated Electro-Optical Mechanical Systems for Biomedical and Environmental Applications, (31 March 1997); https://doi.org/10.1117/12.269978

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