title: [Nicotine affects biological properties of the human osteosarcoma cell line MG63].
abstract: OBJECTIVE
  To evaluate the effect of nicotine on cell proliferation.
  
  
  METHODS
  The cells were cultured with DMEM medium containing 10% fetal bovine serum with 0, 1 x 10(-4) mol x L(-1), and 1 x 10(-3) mol x L(-1) nicotine for up to 3, 5, 7, 10, 14 days. The cell proliferation was evaluated by MTT. The alkaline phosphatase (ALP) activity was estimated by PNPP. The expression of collagen type I (COL1) and osteocalcin (OCN) were estimated by reverse transcription-polymerase chain reaction (RT-PCR).
  
  
  RESULTS
  Nicotine suppressed the cell proliferation. ALP activity increased to peak on 10 days in control and 1 x 10(-4) mol x L(-1) nicotine. COL1 expression increased to peak on 10 days in control and 1 x 10(-4) mol x L(-1) nicotine, but there was decreased to the minimum on 10 days and increased on 14 days in 1 x 10(-3) mol x L(-1) nicotine. OCN expression increased to peak on 10 days in control, and increased in 1 x 10(-4) mol x L(-1) nicontine from 3 days to 14 days, but there wasn't significant change in 1 x 10(-3) mol x L(-1) nicontine.
  
  
  CONCLUSIONS
  Nicotine suppresses osteogenesis through a decrease in ALP and COL1 production by osteoblasts.
authors.affiliation: Dept. of Prosthodontics, School of Stomatology, China Medical University, Shenyang 110002, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Bai
authors.forename: Li-fang
authors.initials: LF
authors.lastname: Zhong
authors.forename: Jing-tao
authors.initials: JT
authors.lastname: Zhu
mesh_terms: D000469:Alkaline Phosphatase; D001859:Bone Neoplasms; D002460:Cell Line; D049109:Cell Proliferation; D024042:Collagen Type I; D006801:Humans; D009538:Nicotine; D010006:Osteoblasts; D015675:Osteocalcin; D010012:Osteogenesis; D012516:Osteosarcoma
chemical_list: D024042:Collagen Type I; D015675:Osteocalcin; D009538:Nicotine; D000469:Alkaline Phosphatase