title: Cell and protein compatibility of parylene-C surfaces.
abstract: Parylene-C, which is traditionally used to coat implantable devices, has emerged as a promising material to generate miniaturized devices due to its unique mechanical properties and inertness. In this paper we compared the surface properties and cell and protein compatibility of parylene-C relative to other commonly used BioMEMS materials. We evaluated the surface hydrophobicity and roughness of parylene-C and compared these results to those of tissue culture-treated polystyrene, poly(dimethylsiloxane) (PDMS), and glass. We also treated parylene-C and PDMS with air plasma, and coated the surfaces with fibronectin to demonstrate that biochemical treatments modify the surface properties of parylene-C. Although plasma treatment caused both parylene-C and PDMS to become hydrophilic, only parylene-C substrates retained their hydrophilic properties over time. Furthermore, parylene-C substrates display a higher degree of nanoscale surface roughness (>20 nm) than the other substrates. We also examined the level of BSA and IgG protein adsorption on various surfaces and found that surface plasma treatment decreased the degree of protein adsorption on both PDMS and parylene-C substrates. After testing the degree of cell adhesion and spreading of two mammalian cell types, NIH-3T3 fibroblasts and AML-12 hepatocytes, we found that the adhesion of both cell types to surface-treated parylene-C variants were comparable to standard tissue culture substrates, such as polystyrene. Overall, these results indicate that parylene-C, along with its surface-treated variants, could potentially be a useful material for fabricating cell-based microdevices.
authors.affiliation: Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Tracy Y
authors.initials: TY
authors.lastname: Chang
authors.forename: Vikramaditya G
authors.initials: VG
authors.lastname: Yadav
authors.forename: Sarah
authors.initials: S
authors.lastname: De Leo
authors.forename: Agustin
authors.initials: A
authors.lastname: Mohedas
authors.forename: Bimal
authors.initials: B
authors.lastname: Rajalingam
authors.forename: Chia-Ling
authors.initials: CL
authors.lastname: Chen
authors.forename: Selvapraba
authors.initials: S
authors.lastname: Selvarasah
authors.forename: Mehmet R
authors.initials: MR
authors.lastname: Dokmeci
authors.forename: Ali
authors.initials: A
authors.lastname: Khademhosseini
mesh_terms: D016475:3T3 Cells; D000818:Animals; D002448:Cell Adhesion / Q000502:physiology; D002460:Cell Line; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism; D016650:Fluorescein-5-isothiocyanate; D005898:Glass / Q000737:chemistry; D022781:Hepatocytes / Q000166:cytology / Q000378:metabolism; D057927:Hydrophobic and Hydrophilic Interactions; D007074:Immunoglobulin G / Q000378:metabolism; D051379:Mice; D018625:Microscopy, Atomic Force; D011108:Polymers / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry; D011506:Proteins / Q000737:chemistry*; D012710:Serum Albumin, Bovine / Q000378:metabolism; D012828:Silicones / Q000737:chemistry; D013499:Surface Properties; D023822:Tissue Engineering / Q000379:methods; D014992:Xylenes / Q000737:chemistry*
chemical_list: D020099:Coated Materials, Biocompatible; D004129:Dimethylpolysiloxanes; D007074:Immunoglobulin G; D011108:Polymers; D011137:Polystyrenes; D011506:Proteins; D012828:Silicones; D014992:Xylenes; C011055:parylene; D012710:Serum Albumin, Bovine; C013830:baysilon; D016650:Fluorescein-5-isothiocyanate