title: Comb-type grafted poly(N-isopropylacrylamide) gel modified surfaces for rapid detachment of cell sheet.
abstract: A comb-type grafted poly(N-isopropylacrylamide) (PIPAAm) gel modified surface was newly developed for providing a rapid cell sheet recovery for tissue engineering. PIPAAm macromonomer was prepared by the etherification reaction of the hydroxyl terminal moieties of PIPAAm with acryloyl chloride, followed by the radical telomerization reaction of N-isopropylacrylamide (IPAAm) monomer using 2-mercaptoethanol as a chain transfer agent. Solution containing IPAAm monomer and PIPAAm macromonomer was spread on the surface of tissue culture polystyrene (TCPS), and then the surface was subjected to electron beam irradiation for grafting the monomer and macromonomer on the surfaces, resulting in comb-type grafted PIPAAm gel modified TCPS (GG-TCPS). Besides the difference of the amount of the modified PIPAAm, no distinct difference was found between the properties of GG-TCPSs and normal-type PIPAAm gel modified TCPS (NG-TCPS) through XPS, AFM and a contact angle measurement. At 37 degrees C, bovine aortic endothelial cells (BAECs) were well adhered and spread on GG-TCPS as well as NG-TCPS regardless of the macromonomer concentration. By lowering temperature to 20 degrees C, BAECs detached themselves more rapidly from GG-TCPS compared with NG-TCPS. Upon lowering temperature, the grafted polymer was speculated to accelerate the hydration of modified PIPAAm gel, resulting in a rapid cell sheet detachment.
authors.affiliation: Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University (TWIns), 8-1 Kawadacho, Shinjuku, Tokyo 162-8666, Japan.
authors.forename: Zhonglan
authors.initials: Z
authors.lastname: Tang
authors.forename: Yoshikatsu
authors.initials: Y
authors.lastname: Akiyama
authors.forename: Masayuki
authors.initials: M
authors.lastname: Yamato
authors.forename: Teruo
authors.initials: T
authors.lastname: Okano
mesh_terms: D000178:Acrylamides / Q000009:adverse effects / Q000737:chemistry*; D000180:Acrylic Resins; D000818:Animals; D001672:Biocompatible Materials / Q000009:adverse effects / Q000138:chemical synthesis / Q000737:chemistry*; D002417:Cattle; D002448:Cell Adhesion / Q000187:drug effects*; D002460:Cell Line; D005782:Gels / Q000009:adverse effects / Q000138:chemical synthesis / Q000737:chemistry*; D008858:Microscopy, Phase-Contrast; D011108:Polymers / Q000009:adverse effects / Q000737:chemistry*; D023822:Tissue Engineering
chemical_list: D000178:Acrylamides; D000180:Acrylic Resins; D001672:Biocompatible Materials; D005782:Gels; D011108:Polymers; C052970:poly-N-isopropylacrylamide