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The tumor cell and telomerase.

M L Altshuler1, S E Severin, A I Glukhov

  • 1Moscow Institute of Medical Ecology, Health Care Department of Moscow, Moscow 117638, Russia. 7034.g23@g23.relcom.ru

Biochemistry. Biokhimiia
|February 6, 2004
PubMed
Summary

Cell division control, specifically the G1-S checkpoint, influences telomerase activation in tumors. However, telomerase can also be activated independently, suggesting multiple pathways contribute to unlimited cell division in cancer.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Cycle Regulation

Background:

  • Malignant transformation arises from dysregulated cell division.
  • The G1-S checkpoint is a critical regulator of the cell cycle.
  • Tumor cells often exhibit telomerase activity, enabling unlimited proliferation.

Purpose of the Study:

  • To investigate the relationship between the G1-S checkpoint and telomerase activation.
  • To determine if telomerase activation is solely dependent on the G1-S checkpoint.

Main Methods:

  • Review of scientific literature on cell cycle regulation and telomerase.
  • Analysis of molecular pathways involving G1-S checkpoint components and telomerase.

Main Results:

  • G1-S checkpoint components (cyclin-dependent kinases, retinoblastoma, E2F proteins) influence telomerase activity.
  • Various factors (Myc, p53, Wnt5A, TGFbeta, estrogens) can activate telomerase through or independently of the G1-S checkpoint.
  • Gene amplification of hTERT occurs independently of the G1-S checkpoint in some tumors.

Conclusions:

  • Telomerase activation in cancer is a complex process involving both G1-S checkpoint-dependent and independent pathways.
  • Multiple signaling molecules and genetic alterations contribute to telomerase activation, facilitating tumor cell immortality.

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