title: Ascorbate modulation of bovine chondrocyte growth, matrix protein gene expression and synthesis in three-dimensional collagen sponges.
abstract: This report completes a previous study on the growth and metabolism of fetal bovine epiphyseal chondrocytes cultured, within native or cross-linked collagen sponges carried out without the addition of fresh ascorbate. At low initial cell density (2.3 x 10(6)cells/cm(3)) cell proliferation and a low matrix deposition were observed, whereas at high initial cell density (2.3 x 10(7)cells/cm(3)) there was an absence of cell proliferation, but the deposition of a cartilage-like matrix was measured. In both cases, only traces of type I collagen (marker of chondrocyte dedifferentiation) were detected. In this report, we observed, after 1 month in culture with ascorbate, in both type of scaffolds and initial cell densities, an increase in cell proliferation (2-fold) and in expression of genes encoding for collagen types I, II, X and MMP-2 and -13, but no change in the level of matrix deposition (collagen and GAG). With regard to the proteins present, the main differences with or without ascorbate concerned the increase of neosynthesised type I collagen (up to 35% of the total collagen deposited in the sponge) and of the MMP-2 active form. In conclusion, these results show that ascorbate is an important factor to consider when preparing cartilage constructs for its action on chondrocyte phenotype modulation and proliferation.
authors.affiliation: Institut de Biologie et Chimie des Protéines, CNRS UMR 5086, 7 Passage du Vercors, 69007 Lyon, France.
authors.forename: Marie Claire
authors.initials: MC
authors.lastname: Ronzière
authors.forename: Stéphane
authors.initials: S
authors.lastname: Roche
authors.forename: Jérôme
authors.initials: J
authors.lastname: Gouttenoire
authors.forename: Olivier
authors.initials: O
authors.lastname: Démarteau
authors.forename: Daniel
authors.initials: D
authors.lastname: Herbage
authors.forename: Anne Marie
authors.initials: AM
authors.lastname: Freyria
mesh_terms: D000818:Animals; D001205:Ascorbic Acid / Q000494:pharmacology*; D001483:Base Sequence; D002417:Cattle; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D019902:Chondrocytes / Q000166:cytology* / Q000187:drug effects / Q000502:physiology*; D003094:Collagen / Q000235:genetics; D017931:DNA Primers; D016326:Extracellular Matrix Proteins / Q000235:genetics*; D018093:Gelatinases / Q000235:genetics; D005786:Gene Expression Regulation / Q000187:drug effects*; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D006025:Glycosaminoglycans / Q000235:genetics; D007150:Immunohistochemistry; D007700:Kinetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013997:Time Factors
chemical_list: D017931:DNA Primers; D016326:Extracellular Matrix Proteins; D006025:Glycosaminoglycans; D003094:Collagen; D018093:Gelatinases; D001205:Ascorbic Acid