title: Telomerase inhibition alters telomere maintenance mechanisms in laryngeal squamous carcinoma cells.
abstract: OBJECTIVE
  Telomere length must be maintained throughout cancer cell progression and proliferation. In most tumours, telomerase activity maintains telomere length. Therefore, telomerase is a target for cancer treatments. However, some cancer cells maintain telomere length through an alternative mechanism termed 'alternative lengthening of telomeres'. To determine how telomerase inhibition relates to the initiation of the alternative lengthening of telomeres pathway, we investigated telomerase activity and telomere maintenance in Hep-2 cells with and without reduced telomerase activity.
  
  
  METHODS
  We investigated telomerase activity levels in a normal Hep-2 cell line and in residual cells following telomerase inhibition treatment. Additionally, we looked for expression of a marker protein for the alternative lengthening of telomeres mechanism.
  
  
  CONCLUSIONS
  In the residual cells, telomerase activity was eliminated. However, these cells had higher levels of the alternative lengthening of telomeres biomarker, suggesting an alternative mechanism for telomere maintenance following telomerase inhibition. These results could have a major impact on the design of new cancer treatments.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, China.
authors.forename: W
authors.initials: W
authors.lastname: Chen
authors.forename: S M
authors.initials: SM
authors.lastname: Chen
authors.forename: Y
authors.initials: Y
authors.lastname: Yu
authors.forename: B K
authors.initials: BK
authors.lastname: Xiao
authors.forename: Z W
authors.initials: ZW
authors.lastname: Huang
authors.forename: Z Z
authors.initials: ZZ
authors.lastname: Tao
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000235:genetics / Q000378:metabolism*; D045744:Cell Line, Tumor; D004268:DNA-Binding Proteins / Q000032:analysis; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007822:Laryngeal Neoplasms / Q000235:genetics / Q000378:metabolism*; D009363:Neoplasm Proteins / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D019098:Telomerase / Q000037:antagonists & inhibitors* / Q000235:genetics; D016615:Telomere / Q000502:physiology*; D014162:Transfection
chemical_list: D004268:DNA-Binding Proteins; D009363:Neoplasm Proteins; D019098:Telomerase