title: The modulation of cellular responses to poly(2-hydroxyethyl methacrylate) hydrogel surfaces: phosphorylation decreases macrophage collagenase production in vitro.
abstract: We examined the regulation of collagenase production by the monocyte/macrophage THP-1 cell line when these cells were exposed to poly(2-hydroxyethyl methacrylate) (PHEMA) hydrogel surfaces with different chemistries and morphologies. Tissue culture modified polystyrene (TCP), used as a control surface, induced the maximum collagenase response. Copolymer hydrogels containing 2-ethoxyethyl methacrylate (EMA) or methyl methacrylate (MMA) also induced a high response, while PHEMA hydrogels induced a low level response and the phosphorylated hydrogel induced no response. This pattern was altered when the morphology of the hydrogels was changed to that of a sponge. The overall enzyme response to the sponge hydrogels was lower than that to the homogeneous hydrogels. Sponges containing EMA and MMA produced low level response relative to the TCP control. PHEMA and phosphorylated sponges produced little and no response respectively. The dramatically reduced enzyme response to phosphorylated surfaces was not a consequence of cell death, and may be a phenomenon related to changes in cell surface charge.
authors.affiliation: Lions Eye Institute, Centre for Ophthalmology and Visual Science, Nedlands, Australia.
authors.forename: B W
authors.initials: BW
authors.lastname: Ziegelaar
authors.forename: J H
authors.initials: JH
authors.lastname: Fitton
authors.forename: A B
authors.initials: AB
authors.lastname: Clayton
authors.forename: S T
authors.initials: ST
authors.lastname: Platten
authors.forename: J
authors.initials: J
authors.lastname: Steer
authors.forename: T V
authors.initials: TV
authors.lastname: Chirila
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D002460:Cell Line; D018914:Cells, Immobilized; D017364:Collagenases / Q000096:biosynthesis*; D004790:Enzyme Induction; D006801:Humans; D020100:Hydrogels / Q000737:chemistry* / Q000494:pharmacology; D008264:Macrophages / Q000187:drug effects / Q000201:enzymology*; D008689:Methacrylates / Q000737:chemistry; D020366:Methylmethacrylate / Q000737:chemistry; D009000:Monocytes / Q000187:drug effects / Q000201:enzymology; D010766:Phosphorylation; D011102:Polyhydroxyethyl Methacrylate / Q000737:chemistry*; D019736:Prostheses and Implants; D013499:Surface Properties; D013755:Tetradecanoylphorbol Acetate
chemical_list: D001672:Biocompatible Materials; D020100:Hydrogels; D008689:Methacrylates; D020366:Methylmethacrylate; D011102:Polyhydroxyethyl Methacrylate; C029263:2-ethoxy ethyl methacrylate; D017364:Collagenases; D013755:Tetradecanoylphorbol Acetate