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Telomerase activity in human cancer

J W Shay1, W E Wright

  • 1Department of Cell Biology and Neuroscience, University of Texas Southwestern Medical Center, Dallas 75235-9039, USA.

Current Opinion in Oncology
|January 1, 1996
PubMed
Summary

Telomeres protect chromosome ends, but shorten in normal cells, causing senescence. Cancer cells activate telomerase to maintain telomeres, enabling sustained tumor growth.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Biology

Background:

  • Telomeres are crucial nucleoprotein structures at chromosome ends, essential for genomic stability.
  • Telomerase, a ribonucleoprotein enzyme, maintains telomeres in tumor cells but is repressed in normal somatic cells.
  • Progressive telomere shortening in normal cells limits replicative capacity, leading to cellular senescence.

Purpose of the Study:

  • To elucidate the role of telomere maintenance in cellular senescence and tumor development.
  • To understand the mechanism of telomerase activation in the context of oncogene-induced proliferation.

Main Methods:

  • Analysis of telomere length dynamics in normal and tumor-derived cell lines.
  • Investigation of telomerase activity regulation during cellular aging and oncogenesis.
  • Study of the impact of oncogenes and somatic mutations on senescence and telomere erosion.

Main Results:

  • Normal somatic cells exhibit progressive telomere shortening due to the end replication problem, culminating in senescence.
  • Viral oncogenes or specific somatic mutations can override senescence, allowing continued cell division.
  • Sustained telomere erosion in these cells ultimately triggers telomerase activation, a critical step for tumor progression.

Conclusions:

  • Telomere maintenance by telomerase is a hallmark of most human tumors, essential for their sustained growth.
  • The repression of telomerase in normal cells acts as a tumor suppressor mechanism.
  • Understanding telomere dynamics and telomerase regulation is key to cancer research and therapeutic strategies.

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