title: [Effect of advanced glycation end products on the human gingival fibroblast proliferation and type I collagen synthesis].
abstract: OBJECTIVE
  To apply the synthesized advanced glycation end products (AGE) to the cultured human gingival fibroblast (HGF) in vitro and then to investigate the effects of AGE on the HGF proliferation and type I collagen synthesis and the potential impact of AGE in the repair of periodontium and its molecular mechanism in diabetes-associated periodontitis.
  
  
  METHODS
  The HGF was obtained from explants of human healthy gingival tissues by using tissue-explant technique. The AGE was prepared and then added to the culture media, its effect on HGF proliferation at different time duration was examined with MTT colorimetric assay. The type I collagen concentrations in cell culture supernatants and intracellular proteins were detected by ELISA, and the type I collagen mRNA expression of HGF was analyzed by real-time RT-PCR.
  
  
  RESULTS
  200 mg/L AGE decreased the A value (P < 0.05) and changed the HGF shape. Incubation of HGF with AGE for 72 hours, the quantities of type I collagen were reduced (P < 0.05), and the expression of type I collagen mRNA was down-regulated (P < 0.05).
  
  
  CONCLUSIONS
  The AGE inhibited the HGF proliferation, decreased the synthesis of type I collagen and down-regulated the expression of type I collagen mRNA, impairing the repair of periodontium.
authors.affiliation: Department of Periodontology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, China.
authors.forename: Liu-ying
authors.initials: LY
authors.lastname: Qi
authors.forename: Yun
authors.initials: Y
authors.lastname: Fu
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhou
mesh_terms: D049109:Cell Proliferation / Q000187:drug effects*; D002478:Cells, Cultured; D024042:Collagen Type I / Q000096:biosynthesis*; D005347:Fibroblasts / Q000166:cytology* / Q000378:metabolism; D005881:Gingiva / Q000166:cytology* / Q000378:metabolism; D017127:Glycation End Products, Advanced / Q000494:pharmacology*; D006801:Humans
chemical_list: D024042:Collagen Type I; D017127:Glycation End Products, Advanced