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Coating and selective deposition of nanofilm on silicone rubber for cell adhesion and growth

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Abstract

A recently developed method for surface modification, layer-by-layer (LbL) assembly, has been applied to silicone, and its ability to encourage endothelial cell growth and control cell growth patterns has been examined. The surfaces studied consisted of a precursor, with alternating cationic polyethyleneimine (PEI) and anionic sodium polystyrene sulfonate (PSS) layers followed by alternating gelatin and poly-d-lysine (PDL) layers. Film growth increased linearly with the number of layers. Each PSS/PEI bilayer was 3 nm thick, and each gelatin/PDL bilayer was 5 nm thick. All layers were more hydrophilic than the unmodified silicone rubber surface, as determined from contact angle measurements. The contact angle was primarily dictated by the outermost layer. Of the coatings studied, gelatin was the most hydrophilic. A film of (PSS/PEI)4/(gelatin/PDL)4/ gelatin was highly favorable for cell adhesion and growth, in contrast to films of (PSS/PEI)8 or (PSS/PEI)8/PSS. Cell growth patterns were successfully controlled by selective deposition of microspheres on silicone rubber, using microcontact printing with a silicone stamp. Cell adhesion was confined to the region of microsphere deposition. These results demonstrate that the LbL self-assembly technique provides a general approach to coat and selectively deposit films with nanometer thickness on silicone rubber. Furthermore, they show that this method is a viable technique for controlling cellular adhesion and growth.

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Authors and Affiliations

  1. Department of Biomedical Engineering and Institute for Micromanufacturing, Louisiana Tech University, 71272, Ruston, LA

    Hua Ai, Yuri M. Lvov & Steven A. Jones

  2. School of Biological Sciences, Louisiana Tech University, 71272, Ruston, LA

    David K. Mills

  3. Department of Molecular and Cellular Physiology, Louisiana State University Health Science Center, 71130, Shreveport, LA

    Merilyn Jennings & Jonathan S. Alexander

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  1. Hua Ai
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  2. Yuri M. Lvov
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  6. Steven A. Jones
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Correspondence to Steven A. Jones.

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Ai, H., Lvov, Y.M., Mills, D.K. et al. Coating and selective deposition of nanofilm on silicone rubber for cell adhesion and growth. Cell Biochem Biophys 38, 103–114 (2003). https://doi.org/10.1385/CBB:38:2:103

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