title: Control of adhesion of human induced pluripotent stem cells to plasma-patterned polydimethylsiloxane coated with vitronectin and γ-globulin.
abstract: Human induced pluripotent stem cells (hiPSCs) are a promising source of cells for medical applications. Recently, the development of polydimethylsiloxane (PDMS) microdevices to control the microenvironment of hiPSCs has been extensively studied. PDMS surfaces are often treated with low-pressure air plasma to facilitate protein adsorption and cell adhesion. However, undefined molecules present in the serum and extracellular matrix used to culture cells complicate the study of cell adhesion. Here, we studied the effects of vitronectin and γ-globulin on hiPSC adhesion to plasma-treated and untreated PDMS surfaces under defined culture conditions. We chose these proteins because they have opposite properties: vitronectin mediates hiPSC attachment to hydrophilic siliceous surfaces, whereas γ-globulin is adsorbed by hydrophobic surfaces and does not mediate cell adhesion. Immunostaining showed that, when applied separately, vitronectin and γ-globulin were adsorbed by both plasma-treated and untreated PDMS surfaces. In contrast, when PDMS surfaces were exposed to a mixture of the two proteins, vitronectin was preferentially adsorbed onto plasma-treated surfaces, whereas γ-globulin was adsorbed onto untreated surfaces. Human iPSCs adhered to the vitronectin-rich plasma-treated surfaces but not to the γ-globulin-rich untreated surfaces. On the basis of these results, we used perforated masks to prepare plasma-patterned PDMS substrates, which were then used to pattern hiPSCs. The patterned hiPSCs expressed undifferentiated-cell markers and did not escape from the patterned area for at least 7 days. The patterned PDMS could be stored for up to 6 days before hiPSCs were plated. We believe that our results will be useful for the development of hiPSC microdevices.
authors.affiliation: Department of Bioengineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan.
authors.forename: Ryotaro
authors.initials: R
authors.lastname: Yamada
authors.affiliation: Research Center for Stem Cell Engineering, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5th, 1-1-1 Higashi, Tsukuba, 5 Ibaraki 305-8565, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Hattori
authors.affiliation: Department of Bioengineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan.
authors.forename: Saoko
authors.initials: S
authors.lastname: Tachikawa
authors.affiliation: Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan.
authors.forename: Motohiro
authors.initials: M
authors.lastname: Tagaya
authors.affiliation: Department of Electrical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Sasaki
authors.affiliation: Research Center for Stem Cell Engineering, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5th, 1-1-1 Higashi, Tsukuba, 5 Ibaraki 305-8565, Japan.
authors.forename: Shinji
authors.initials: S
authors.lastname: Sugiura
authors.affiliation: Research Center for Stem Cell Engineering, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5th, 1-1-1 Higashi, Tsukuba, 5 Ibaraki 305-8565, Japan.
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Kanamori
authors.affiliation: Department of Bioengineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan; Top Runner Incubation Center for Academia-Industry Fusion, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan. Electronic address: kohnuma@vos.nagaokaut.ac.jp.
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Ohnuma
mesh_terms: D000327:Adsorption; D002448:Cell Adhesion; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D005109:Extracellular Matrix / Q000737:chemistry; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D057026:Induced Pluripotent Stem Cells / Q000166:cytology* / Q000502:physiology; D055616:Microtechnology; D058626:Plasma Gases / Q000737:chemistry; D019096:Vitronectin / Q000737:chemistry*; D005719:gamma-Globulins / Q000737:chemistry*
chemical_list: D004129:Dimethylpolysiloxanes; D058626:Plasma Gases; D019096:Vitronectin; D005719:gamma-Globulins; C013830:baysilon
keywords: Cell adhesion; Competitive adsorption; Feeder-free culture; Low-pressure air plasma; Microdevice; Microenvironment control; Polydimethylsiloxane; Serum-free culture; iPS cells