title: [Effects of 9-cis-retinoic acid on cell cycle and expression of cyclin D1 and cdk4 in lung cancer cells].
abstract: OBJECTIVE
  To study the effects of 9-cis-retinoic acid (9-cis-RA) on cell cycle and expression of cyclin D1 and cdk4 in lung cancer cells.
  
  
  METHODS
  9-cis-RA (1 x 10(-6) mol.L-1) was used to treat lung cancer cells for 24 h; Flow cytometry (FCM) was used to detect the percent of G0/G1 phase and S phase cells of three groups including blank control, DMSO control and 9-cis-RA groups; RT-PCR was used to analyze the expression changes of cyclin D1 and cdk4 before and after treatment with 9-cis-RA in lung cancer cells.
  
  
  RESULTS
  The percent of G0/G1 phase cells of 9-cis-RA groups was significantly higher than that of the control groups (P < 0.01 or P < 0.05) and the percent of S phase cells of 9-cis-RA groups was lower than that of the control groups (P < 0.01 or P < 0.05); the expression of cyclin D1 of PG, SPC-A1 and L78 cells was decreased (P < 0.01) and the expression of cdk4 of PG, A549 and L78 cells was also decreased (P < 0.01) after treatment with 9-cis-RA.
  
  
  CONCLUSIONS
  Most of the proliferation and the expression of cyclin D1 and cdk4 of PG, A549, SPC-A1 and L78 were inhibited by 9-cis-RA.
authors.affiliation: Institute of Biochemistry and Molecular Biology, Medical College, Jinan, China.
authors.forename: Gui-jie
authors.initials: GJ
authors.lastname: Ren
authors.forename: Zhi-fang
authors.initials: ZF
authors.lastname: Liu
authors.forename: Guo-qiang
authors.initials: GQ
authors.lastname: Hu
authors.forename: Xiao-yan
authors.initials: XY
authors.lastname: Hu
authors.forename: Ke-li
authors.initials: KL
authors.lastname: Tian
authors.forename: Xue-yan
authors.initials: XY
authors.lastname: Yu
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism / Q000473:pathology; D000077556:Alitretinoin; D000970:Antineoplastic Agents / Q000494:pharmacology*; D002294:Carcinoma, Squamous Cell / Q000378:metabolism / Q000473:pathology; D002455:Cell Division / Q000187:drug effects; D045744:Cell Line, Tumor; D019938:Cyclin D1 / Q000096:biosynthesis*; D051358:Cyclin-Dependent Kinase 4; D018844:Cyclin-Dependent Kinases / Q000096:biosynthesis*; D016193:G1 Phase / Q000187:drug effects; D006801:Humans; D008175:Lung Neoplasms / Q000378:metabolism / Q000473:pathology*; D011518:Proto-Oncogene Proteins; D016192:Resting Phase, Cell Cycle / Q000187:drug effects; D016196:S Phase / Q000187:drug effects; D014212:Tretinoin / Q000494:pharmacology*
chemical_list: D000970:Antineoplastic Agents; D011518:Proto-Oncogene Proteins; D019938:Cyclin D1; D000077556:Alitretinoin; D014212:Tretinoin; C495900:CDK4 protein, human; D051358:Cyclin-Dependent Kinase 4; D018844:Cyclin-Dependent Kinases