title: Thermoresponsive poly(N-isopropyl acrylamide)-grafted polycaprolactone films with surface immobilization of collagen.
abstract: Thermoresponsive poly(N-isopropylacrylamide) (P(NIPAAm))-grafted polycaprolactone (PCL) films with a suitable amount of immobilized cell-adhesive collagen were prepared to improve cell adhesion and proliferation above the lower critical solution temperature (LCST, 32°C) of P(NIPAAm) without destroying cell detachment properties at lower temperatures. Covalently tethered P(NIPAAm) brushes on PCL film surfaces were first prepared via surface-initiated atom transfer radical polymerization (ATRP). The alkyl bromide end groups of the grafted P(NIPAAm) brushes were used in nucleophilic substitution reactions for the direct coupling of collagen to produce the collagen-immobilized thermoresponsive PCL surface. At 37°C, the cell attachments on the collagen-immobilized thermoresponsive PCL surface were enhanced substantially. The attached cells could be recovered simply by lowering culture temperature. The P(NIPAAm)-grafted PCL films with immobilized collagen are potentially useful as adhesion modifiers for advanced cell culture and tissue engineering applications.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, College of Materials Science & Engineering, Beijing University of Chemical Technology, Beijing, China. xufj@mail.buct.edu.cn
authors.forename: F J
authors.initials: FJ
authors.lastname: Xu
authors.forename: Y Q
authors.initials: YQ
authors.lastname: Zheng
authors.forename: W J
authors.initials: WJ
authors.lastname: Zhen
authors.forename: W T
authors.initials: WT
authors.lastname: Yang
mesh_terms: D016475:3T3 Cells; D000178:Acrylamides / Q000737:chemistry* / Q000494:pharmacology; D000180:Acrylic Resins; D000818:Animals; D002448:Cell Adhesion / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D003094:Collagen / Q000737:chemistry*; D008567:Membranes, Artificial; D051379:Mice; D015394:Molecular Structure; D011091:Polyesters / Q000737:chemistry* / Q000494:pharmacology; D011108:Polymers / Q000737:chemistry* / Q000494:pharmacology
chemical_list: D000178:Acrylamides; D000180:Acrylic Resins; D008567:Membranes, Artificial; D011091:Polyesters; D011108:Polymers; C016240:polycaprolactone; C052970:poly-N-isopropylacrylamide; D003094:Collagen