title: Swelling induced detachment of chondrocytes using RGD-modified poly(N-isopropylacrylamide) hydrogel beads.
abstract: Thermally sensitive poly(N-isopropylacrylamide, NIPAAm) hydrogel beads conjugated with a cell adhesive motif, GRGDY, were prepared and utilized as cell culture substrate for chondrocytes. They were produced to be uniform in size and distribution by using calcium alginate as a temporal mold. The RGD moieties were introduced, in a spatially selective manner, to the surface of the beads by conjugating GRGDY under the precollapsed state at a higher temperature above the lower critical solution temperature (LCST). These RGD-conjugated polyNIPAAm beads demonstrated a reversible swelling and deswelling behavior around the LCST, which enabled the chondrocytes attached on the surface of collapsed beads at 37 degrees C to readily detach when the temperature was shifted below 37 degrees C. The cell detachment percentage was largely affected by the temperature-dependent reswelling extent of the collapsed RGD-modified beads.
authors.affiliation: Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Taejon 305-701, South Korea.
authors.forename: Mee Ryang
authors.initials: MR
authors.lastname: Kim
authors.forename: Ji Hoon
authors.initials: JH
authors.lastname: Jeong
authors.forename: Tae Gwan
authors.initials: TG
authors.lastname: Park
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D002448:Cell Adhesion; D019902:Chondrocytes / Q000166:cytology*; D006358:Hot Temperature; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D009842:Oligopeptides / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; D009842:Oligopeptides; C052970:poly-N-isopropylacrylamide; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; C047981:arginyl-glycyl-aspartic acid