title: Downregulation of Cdk1 and cyclinB1 expression contributes to oridonin-induced cell cycle arrest at G2/M phase and growth inhibition in SGC-7901 gastric cancer cells.
abstract: BACKGROUND
  Oridonin isolated from Rabdosia rubescens, a plant used to treat cancer in Chinese folk medicine, is one of the most important antitumor active ingredients. Previous studies have shown that oridonin has anti- tumor activities in vivo and in vitro, but little is known about cell cycle effects of oridonin in gastric cancer.
  
  
  METHODS
  MTT assay was adopted to detect the proliferation inhibition of SGC-7901 cells, the cell cycle was assessed by flow cytometry and protein expression by Western blotting.
  
  
  RESULTS
  Oridonin could inhibit SGC-7901 cell proliferation, the IC50 being 15.6 μM, and blocked SGC-7901 cell cycling in the G2/M phase. The agent also decreased the protein expression of cyclinB1 and CDK1.
  
  
  CONCLUSIONS
  Oridonin may inhibit SGC-7901 growth and block the cells in the G2/M phase by decreasing Cdk1 and cyclinB1 proteins.
authors.affiliation: Institute of Materia Medica, Research Center of Life Science and Environmental Science, Harbin University of Commerce, and Key Laboratory of Cancer Prevention and Anticancer Drugs of Heilongjiang Province, Harbin, China E-mail : sygao2002@163.com.
authors.forename: Shi-Yong
authors.initials: SY
authors.lastname: Gao
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Xiao-Ying
authors.initials: XY
authors.lastname: Qu
authors.forename: Nan
authors.initials: N
authors.lastname: Zhu
authors.forename: Yu-Bin
authors.initials: YB
authors.lastname: Ji
mesh_terms: D017209:Apoptosis / Q000187:drug effects; D015153:Blotting, Western; D016203:CDC2 Protein Kinase; D059447:Cell Cycle Checkpoints / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects*; D049109:Cell Proliferation / Q000187:drug effects*; D056744:Cyclin B1 / Q000378:metabolism*; D018844:Cyclin-Dependent Kinases / Q000378:metabolism*; D045786:Diterpenes, Kaurane / Q000494:pharmacology*; D015536:Down-Regulation; D005434:Flow Cytometry; D016195:G2 Phase / Q000187:drug effects*; D006801:Humans; D037602:Isodon / Q000737:chemistry*; D015394:Molecular Structure; D013274:Stomach Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D014407:Tumor Cells, Cultured
chemical_list: C534699:CCNB1 protein, human; D056744:Cyclin B1; D045786:Diterpenes, Kaurane; C011959:oridonin; D016203:CDC2 Protein Kinase; C528899:CDK1 protein, human; D018844:Cyclin-Dependent Kinases