title: Over-expression of LPTS-L in hepatocellular carcinoma cell line SMMC-7721 induces crisis.
abstract: OBJECTIVE
  To evaluate the function of the longer transcripts LPTS-L in hepatocellular carcinoma cell line SMMC-7721.
  
  
  METHODS
  SMMC-7721 cells were transfected with LPTS-L expression construct and stably transfected cells were selected by G418. Multiple single clones formed and were checked for their phenotype. In the study of the effect on telomerase activity of LPTS-L in vitro, GST-LPTS-L fusion protein was expressed in E.coli and purified by glutathione-agarose column. Telomeric repeat amplification protocol (TRAP) assays were performed to study the influence of telomerase activity in SMMC-7721 cells.
  
  
  RESULTS
  Over-expression of LPTS-L induced SMMC-7721 cells into crisis. LPTS-L could inhibit the telomerase activity in SMMC-7721 cells in vitro.
  
  
  CONCLUSIONS
  LPTS-L is a potent telomerase inhibitor. Over-expression of LPTS-L can induce hepatoma cells into crisis due to the reduction of telomerase activity.
authors.affiliation: State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Liao
authors.forename: Mu-Jun
authors.initials: MJ
authors.lastname: Zhao
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
authors.forename: Di
authors.initials: D
authors.lastname: Jia
authors.forename: Hai
authors.initials: H
authors.lastname: Song
authors.forename: Zai-Ping
authors.initials: ZP
authors.lastname: Li
mesh_terms: D006528:Carcinoma, Hepatocellular / Q000201:enzymology / Q000235:genetics* / Q000473:pathology; D018797:Cell Cycle Proteins; D015870:Gene Expression; D016147:Genes, Tumor Suppressor; D006801:Humans; D008113:Liver Neoplasms / Q000201:enzymology / Q000235:genetics* / Q000473:pathology; D011506:Proteins / Q000235:genetics*; D011993:Recombinant Fusion Proteins / Q000235:genetics; D019098:Telomerase / Q000378:metabolism; D014162:Transfection; D014407:Tumor Cells, Cultured; D025521:Tumor Suppressor Proteins
chemical_list: D018797:Cell Cycle Proteins; C440808:PINX1 protein, human; D011506:Proteins; D011993:Recombinant Fusion Proteins; D025521:Tumor Suppressor Proteins; D019098:Telomerase