AKIYAMA Yoshikatsu    Department   Research Institutes and Facilities, Research Institutes and Facilities    Position   Assistant Professor
Article types	Original article
Language	English
Peer review	Peer reviewed
Title	Fabrication of a cell array on ultrathin hydrophilic polymer gels utilising electron beam irradiation and UV excimer laser ablation
Journal	Formal name：Biomaterials ISSN code：01429612
Domestic / Foregin	Foregin
Publisher	Elsevier
Volume, Issue, Page	26(26),pp.5395-5404
Author and coauthor	IWANAGA Shintaroh, AKIYAMA Yoshikatsu, KIKUCHI Akihiko, YAMATO Masayuki, SAKAI Kiyotaka, OKANO Teruo
Authorship	2nd author
Publication date	2005/09
Summary	Most of the surface patterning methods currently applied are based on lithography techniques and microfabrication onto silicon or glass substrates. Here we report a novel method to prepare patterned surfaces on polystyrene substrates by grafting ultrathin cell-repellent polymer layers utilising both electron beam (EB) polymerisation and local laser ablation techniques for microfabrication. Polyacrylamide was grafted onto tissue culture polystyrene (TCPS) dishes using EB irradiation. Water contact angles for these PAAm-grafted TCPS surfaces were less than 10° () with PAAm grafted amounts of 1.6 μg/cm2 as determined by ATR/FT-IR. UV excimer laser (ArF: 193 nm) ablation resulted in the successful fabrication of micropatterned surfaces composed of hydrophilic PAAm and hydrophobic basal polystyrene layers. Bovine carotid artery endothelial cells adhered only to the ablated domains after pretreatment of the patterned surfaces with 15 μg/mL fibronectin at 37 °C. The ablated domain sizes significantly influenced the number of cells occupying each domain. Cell patterning functionality of the patterned surfaces was maintained for more than 2 months without loss of pattern fidelity, indicating that more durable cell arrays can be obtained compared to those prepared by self-assembled monolayers of alkanethiols, as described in previous reports. The surface fabrication techniques presented here can be utilised for the preparation of cell-based biosensors as well as tissue engineering constructs.
DOI	https://doi.org/10.1016/j.biomaterials.2005.01.021