title: Neural cell pattern formation on glass and oxidized silicon surfaces modified with poly(N-isopropylacrylamide).
abstract: Control over the adsorption of proteins and over the adsorption and spatial orientation of mammalian cells onto surfaces has been achieved by modification of glass and other silicon oxide substrates with poly(N-isopropylacrylamide) (PNIPAM). The functionalization of the substrates was achieved either by a polymer-analogous reaction of aminosilanes with reactive N-(isopropylacrylamide) (NIPAM)-copolymers and by copolymerization of NIPAM with surface-bound methacrylsilane. The obtained coatings were characterized by FT-1R, ellipsometry, and surface plasmon resonance measurements. The adsorption of two proteins-fibrinogen and ribonuclease A-on these surfaces was studied in situ by real time surface plasmon resonance measurements. The PNIPAM-grafted surfaces prepared by either chemical procedure inhibited the adsorption of both proteins. More importantly they prevented the adhesion of neuroblastomaXglioma hybrid cells cultured either in serum-free medium or in a medium containing serum proteins. Deep-UV irradiation was used to perform ablation processes and to create patterns permitting the examination of spatially controlled adhesion and growth of cells. This study showed that patterned ultrathin polymer films on glass are suitable substrates for controlling the interactions of cells with surfaces and are capable of directing the attachment and spreading of cells.
authors.affiliation: Institut für organische Chemie, Gutenberg Universität, Mainz, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Bohanon
authors.forename: G
authors.initials: G
authors.lastname: Elender
authors.forename: W
authors.initials: W
authors.lastname: Knoll
authors.forename: P
authors.initials: P
authors.lastname: Köberle
authors.forename: J S
authors.initials: JS
authors.lastname: Lee
authors.forename: A
authors.initials: A
authors.lastname: Offenhäusser
authors.forename: H
authors.initials: H
authors.lastname: Ringsdorf
authors.forename: E
authors.initials: E
authors.lastname: Sackmann
authors.forename: J
authors.initials: J
authors.lastname: Simon
authors.forename: G
authors.initials: G
authors.lastname: Tovar
authors.forename: F M
authors.initials: FM
authors.lastname: Winnik
mesh_terms: D000178:Acrylamides / Q000737:chemistry* / Q000378:metabolism; D001672:Biocompatible Materials / Q000737:chemistry* / Q000378:metabolism; D001798:Blood Proteins / Q000737:chemistry / Q000378:metabolism; D002448:Cell Adhesion / Q000502:physiology* / Q000528:radiation effects; D002455:Cell Division / Q000528:radiation effects; D002470:Cell Survival; D005898:Glass; D005910:Glioma / Q000378:metabolism / Q000473:pathology; D006801:Humans; D008970:Molecular Weight; D009447:Neuroblastoma / Q000378:metabolism / Q000473:pathology; D010084:Oxidation-Reduction; D011108:Polymers; D012825:Silicon / Q000378:metabolism*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D014407:Tumor Cells, Cultured; D014466:Ultraviolet Rays
chemical_list: D000178:Acrylamides; D001672:Biocompatible Materials; D001798:Blood Proteins; D011108:Polymers; C067295:N-isopropylacrylamide; D012825:Silicon