Skip to content
Journal article

Rapid upregulation of telomerase activity in human leukemia HL-60 cells treated with clinical doses of the DNA-damaging drug etoposide.

Autexier C, Moriarty T, Dupuis S ...see all

Leukemia : official journal of the Leukemia Society of America, Leukemia Research Fund, U.K, vol. 16, issue 6 (2002) pp. 1112-20

  • 19

    Readers

    Mendeley users who have this article in their library.
  • 19

    Citations

    Citations of this article.
  • N/A

    Views

    ScienceDirect users who have downloaded this article.
Sign in to save reference

Abstract

The enzyme telomerase is implicated in cellular resistance to apoptosis, but the mechanism for this resistance remains to be elucidated. The ability of telomerase to synthesize new DNA at telomeres suggests that this enzyme might function in the repair of double-stranded DNA breaks. To distinguish the effects of double-stranded DNA break damage and apoptosis on human telomerase activity, we treated the HL-60 human hematopoietic cancer cell line with clinical doses of the chemotherapeutic drug etoposide (0.5 to 5 microM), which allowed us to distinguish between events associated with DNA damage-induced cell cycle arrest, and events associated with apoptosis. Large (three- to seven-fold) upregulation of telomerase activity occurred soon after etoposide treatment (3 h) in S/G2/M-arresting populations; this upregulation was abolished at onset of apoptotic cell death. No upregulation of telomerase activity was observed in cells treated with a larger dose of etoposide (5 microM) that caused cells to undergo rapid apoptosis without intervening cell cycle arrests. These observations are consistent with a possible role for telomerase upregulation during the DNA damage response.

Author-supplied keywords

  • Acute
  • Acute: enzymology
  • Acute: genetics
  • Acute: pathology
  • Antineoplastic Agents
  • Apoptosis
  • Cell Cycle
  • Cell Nucleus
  • Cell Nucleus: ultrastructure
  • DNA
  • DNA Damage
  • DNA Fragmentation
  • Diploidy
  • Dose-Response Relationship
  • Drug
  • Enzyme Activation
  • Etoposide
  • Etoposide: administration & dosage
  • Etoposide: pharmacology
  • Etoposide: toxicity
  • HL-60 Cells
  • Humans
  • Kinetics
  • Leukemia
  • Neoplasm
  • Neoplasm: genetics
  • Neoplasm: ultrastructure
  • Phytogenic
  • Phytogenic: administration
  • Phytogenic: pharmacology
  • Phytogenic: toxicity
  • Promyelocytic
  • Telomerase
  • Telomerase: metabolism
  • Up-Regulation

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text

Authors

  • Chantal Autexier

  • T J Moriarty

  • S Dupuis

Cite this document

Choose a citation style from the tabs below