title: [A study on apoptosis of nasopharyngeal carcinoma cell line induced by Tanshinone II A and its molecular mechanism].
abstract: OBJECTIVE
  To assess effect of Tanshinone II A on the apoptosis of human nasopharyngeal carcinoma (NPC) cell line CNE-1 and inquire into the mechanism there in involved.
  
  
  METHODS
  The CNE-1 cells cultured in vitro were treated with 0.5 microgram/ml Tanshinone II A for 4 days. The morphology of the cells was observed by microscopy. The cell growth and proliferation were measured by cell counting. The DNA break was examined by gel electrophoresis. The cell cycle, apoptosis index (AI) and the expression of apoptosis associated gene were analysed by flow cytometry.
  
  
  RESULTS
  0.5 microgram/ml Tanshinone II A could induce the apoptosis of CNE-1 cells. In the treatment group, the morphologic characteristics of apoptotic cells were observed, the DNA of cells presented "ladder" break, the cell growth and proliferation were inhibited obviously, and the AI was 16.9% (the AI of control group was 6.4%). The cells were arrested in G0/G1 phase and cellular DNA synthesis was inhibited. The expressions of apoptosis associated gene fas, bax, p53 and p21 were up-regulated; the expression of bcl-2 was down-regulated.
  
  
  CONCLUSIONS
  Tanshinone II A can induce apoptosis of human nasopharyngeal carcinoma cells. Its molecular mechanism may relate to modulation of the apoptosis associated gene expression.
authors.affiliation: Institute of Cancer Research, West China Hospital, Sichuan University, Chengdu 610041, China.
authors.forename: Shulan
authors.initials: S
authors.lastname: Yuan
authors.forename: Yanping
authors.initials: Y
authors.lastname: Wang
authors.forename: Xiaohe
authors.initials: X
authors.lastname: Chen
authors.forename: Yi
authors.initials: Y
authors.lastname: Song
authors.forename: Yan
authors.initials: Y
authors.lastname: Yang
mesh_terms: D045784:Abietanes; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D006801:Humans; D009303:Nasopharyngeal Neoplasms / Q000473:pathology*; D010616:Phenanthrenes / Q000494:pharmacology*; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000096:biosynthesis / Q000235:genetics; D014407:Tumor Cells, Cultured; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis / Q000235:genetics
chemical_list: D045784:Abietanes; D000972:Antineoplastic Agents, Phytogenic; D010616:Phenanthrenes; D019253:Proto-Oncogene Proteins c-bcl-2; D016159:Tumor Suppressor Protein p53; C021751:tanshinone