title: Silica-collagen bionanocomposites as three-dimensional scaffolds for fibroblast immobilization.
abstract: Silica-collagen bionanocomposite hydrogels were obtained by addition of silica nanoparticles to a protein suspension followed by neutralization. Electron microscopy studies indicated that larger silica nanoparticles (80 nm) do not interact strongly with collagen, whereas smaller ones (12 nm) form rosaries along the protein fibers. However, the composite network structurally evolved with time due to the contraction of the cells and the dissolution of the silica nanoparticles. When compared to classical collagen hydrogels, these bionanocomposite materials showed lower surface contraction in the short term (1 week) and higher viability of entrapped cells in the long term (3 weeks). A low level of gelatinase MMP2 enzyme expression was also found after this period. Several proteins involved in the catabolic and anabolic activity of the cells could also be observed by immunodetection techniques. All these data suggest that the bionanocomposite matrices constitute a suitable environment for fibroblast adhesion, proliferation and biological activity and therefore constitute an original three-dimensional environment for in vitro cell culture and in vivo applications, in particular as biological dressings.
authors.affiliation: UPMC Université Paris, CNRS, France.
authors.forename: Martín F
authors.initials: MF
authors.lastname: Desimone
authors.forename: Christophe
authors.initials: C
authors.lastname: Hélary
authors.forename: Ivo B
authors.initials: IB
authors.lastname: Rietveld
authors.forename: Isabelle
authors.initials: I
authors.lastname: Bataille
authors.forename: Gervaise
authors.initials: G
authors.lastname: Mosser
authors.forename: Marie-Madeleine
authors.initials: MM
authors.lastname: Giraud-Guille
authors.forename: Jacques
authors.initials: J
authors.lastname: Livage
authors.forename: Thibaud
authors.initials: T
authors.lastname: Coradin
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D018929:Cell Culture Techniques / Q000379:methods; D002478:Cells, Cultured; D003094:Collagen / Q000737:chemistry*; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism*; D006801:Humans; D020100:Hydrogels / Q000737:chemistry*; D008422:Materials Testing; D053511:Matrix Metalloproteinase 14 / Q000378:metabolism; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism; D053761:Nanocomposites / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D023822:Tissue Engineering / Q000379:methods*; D054457:Tissue Scaffolds / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D020100:Hydrogels; D012822:Silicon Dioxide; D003094:Collagen; D020778:Matrix Metalloproteinase 2; D053511:Matrix Metalloproteinase 14