オカノ　テルオ   Okano Teruo   岡野　光夫    所属   医学研究科 医学研究科 (医学部医学科をご参照ください)    職種   評議員
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Simultaneous enhancement of cell proliferation and thermally induced harvest efficiency based on temperature-responsive cationic copolymer-grafted microcarriers
掲載誌名	正式名：Biomacromolecules 略　 称：Biomacromolecules ISSNコード：15257797/15264602
巻・号・頁	13(6),pp.1765-1773
著者・共著者	Tamura Atsushi†, Nishi Masanori, Kobayashi Jun, Nagase Kenichi, Yajima Hirofumi, Yamato Masayuki, Okano Teruo*
担当区分	責任著者
発行年月	2012/06
概要	The development of large-scale suspension cell cultures using microcarriers has long been a focus of attention in the fields of pharmacy and biotechnology. Previously, we developed cell-detachable microcarriers based on temperatureresponsive poly(N-isopropylacrylamide) (PIPAAm)-grafted beads, on which adhering cells can be noninvasively harvested by only reducing the temperature without the need for proteolytic enzyme treatment. In this study, to improve the cell harvest efficiency from bead surfaces while maintaining cell adhesion and proliferation properties, we prepared temperatureresponsive cationic copolymer-grafted beads bearing a copolymer brush consisting of IPAAm, positively charged quaternary amine monomer (3-acrylamidopropyl trimethylammonium chloride; APTAC), and hydrophobic monomer (N-tert-butylacrylamide; tBAAm). The incorporation of positively charged APTAC into the grafted copolymer brush facilitated bead dispersibility in a cell culture system containing Chinese hamster ovary (CHO-K1) cells and consequently allowed for enhanced cell proliferation in the system compared to that of unmodified CMPS and conventional PIPAAm homopolymer-grafted beads. Additionally, P(IPAAm-co-APTAC-co-tBAAm) terpolymer-grafted beads exhibited the most rapid and efficient cell detachment behavior after the temperature was reduced to 20 °C, presumably because the highly hydrated APTAC promoted the overall hydration of the P(IPAAm-co-APTAC-co-tBAAm) chains. Therefore, P(IPAAm-co-APTAC-co-tBAAm) terpolymer-grafted microcarriers are effective in facilitating both cell proliferation and thermally induced cell detachment in a suspension culture system.
DOI	10.1021/bm300256e