title: [Effects of telomerase sense and antisense oligodeoxynucleotides on growth and differentiation of nasopharyngeal carcinoma cells].
abstract: OBJECTIVE
  It was reported that telomere and telomerase were associated with the development of cancers. Telomerase antisense oligodeoxynucleotides(ASODN) directly act on telomerase, or induce tumor cells to differentiate, result in telomerase activity decreases, and cells growth inhibited. However, whether the inhibition of telomerase activity by ASODN could induce tumor cells to differentiate is still unknown. Telomerase RNA acts as a template for synthesis of telomere, so telomerase sense oligodeoxynucleotides(SODN) can be hybridized to the telomere DNA. Whether this reaction could affect the growth of tumor cells is worth being studied. This research was just to investigate the effects of telomerase SODN and ASODN on the growth and differentiation of nasopharyngeal carcinoma(NPC) cells.
  
  
  METHODS
  After transfecting telomerase SODN and ASODN into NPC CNE1 and CNE2Z cells by lipofectin, the proliferation of the cells was identified by MTT method, and the expression of keratin was detected by immunohistochemistry. Meanwhile, the morphological changes of the cells were observed.
  
  
  RESULTS
  SODN inhibited the growth of CNE1 and CNE2Z cells as well as ASODN in dose- and time-dependent manner. After being treated with 1.5 mumol/L, 3.0 mumol/L, 4.5 mumol/L, and 6.0 mumol/L SODN, the inhibition rates in CNE1 cells for 6 h were 16.28%, 19.38%, 22.48%, and 23.26%, respectively; for 48 h were 26.26%, 38.89%, 39.90%, and 38.89%, respectively; the inhibition rates in CNE2Z cells for 6 h were 7.69%, 8.24%, 18.13%, and 20.32%, respectively, and for 48 h were 28.84%, 28.88%, 32.89%, and 31.54%, respectively. The keratin expressions in cells of SODN and ASODN groups were significantly increased and the cells tended to be mature.
  
  
  CONCLUSIONS
  The telomerase SODN and ASODN could both inhibit the growth of NPC cells and induce cells to differentiate.
authors.affiliation: Department of Pathophysiology, Guangdong Medical College, Zhanjiang 524023, P. R. China. ZSZ01@263.net
authors.forename: Su-zhen
authors.initials: SZ
authors.lastname: Zhang
authors.forename: Pei-chun
authors.initials: PC
authors.lastname: Huang
authors.forename: Yong
authors.initials: Y
authors.lastname: Xu
authors.forename: Jin
authors.initials: J
authors.lastname: Chen
authors.forename: Kang-rong
authors.initials: KR
authors.lastname: Cai
mesh_terms: D002454:Cell Differentiation; D002455:Cell Division; D004268:DNA-Binding Proteins; D006801:Humans; D009303:Nasopharyngeal Neoplasms; D020319:Oligodeoxyribonucleotides, Antisense; D019098:Telomerase / Q000235:genetics* / Q000378:metabolism; D014407:Tumor Cells, Cultured
chemical_list: D004268:DNA-Binding Proteins; D020319:Oligodeoxyribonucleotides, Antisense; D019098:Telomerase