title: [Gene transfection of Livin isoforms into A549 cell line and its effect on cell growth and sensitivity to chemotherapy and radiotherapy].
abstract: OBJECTIVE
  To express Livin alpha & beta in A549 cells by using gene transfection, and to observe its effect on cell growth and cell sensitivity to chemotherapy drugs and radiation.
  
  
  METHODS
  Eukaryotic expression vectors of Livin alpha & beta were transfected into A549 cells and cell clones with stable expression were obtained. Livin alpha & beta expression levels in the transfected A549 cells were assessed at mRNA level and protein level, respectively. Cell growth status was assessed by biological features. MTT was performed to test effects of Livin on sensitivity of the A549 cells to chemotherapy drugs and radiation, and cell cycle analysis was performed to evaluate cell apoptosis.
  
  
  RESULTS
  After transfection, positive cells, especially A549 cells expressing Livin, showed an increase of about 20% in colony-forming ability, a shorter doubling time (P < 0.05) and lower sensitivity to chemotherapy drugs and radiation (P < 0.01). Only 0.2% of the cells committed apoptosis with 10 Gy radiation.
  
  
  CONCLUSIONS
  Livin isoforms, especially Livin alpha, are implicated in genesis and development of lung cancer, thus may be an important mechanism for drug resistance of lung cancer cells.
authors.affiliation: Cancer Center of PLA, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China.
authors.forename: Jian-guo
authors.initials: JG
authors.lastname: Sun
authors.forename: Rong-xia
authors.initials: RX
authors.lastname: Liao
authors.forename: Zheng-tang
authors.initials: ZT
authors.lastname: Chen
authors.forename: Zhi-xin
authors.initials: ZX
authors.lastname: Wang
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhang
authors.forename: Yi-de
authors.initials: YD
authors.lastname: Hu
authors.forename: Dong-lin
authors.initials: DL
authors.lastname: Wang
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics*; D017209:Apoptosis; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D019008:Drug Resistance, Neoplasm; D006801:Humans; D051034:Inhibitor of Apoptosis Proteins / Q000235:genetics*; D009363:Neoplasm Proteins / Q000235:genetics*; D014162:Transfection
chemical_list: D048868:Adaptor Proteins, Signal Transducing; C419866:BIRC7 protein, human; D051034:Inhibitor of Apoptosis Proteins; D009363:Neoplasm Proteins