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Related Experiment Videos

Telomerase activity in normal human endothelial cells

R Hsiao1, H W Sharma, S Ramakrishnan

  • 1Division of Oncology, Roche Research Center, Hoffmann-La Roche, Inc., Nutley, NJ 07110, USA.

Anticancer Research
|March 1, 1997
PubMed
Summary
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Normal human endothelial cells show growth-related telomerase activity, which is repressed in quiescent cells and lost during in vitro culturing or cell cycle arrest. This suggests telomerase is not exclusive to cancer cells.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Telomerase is a ribonucleoprotein enzyme responsible for maintaining telomere length by adding repeats to chromosome ends.
  • Telomerase activity is typically found in germ cells and reactivated in most cancer cells, but its presence in normal somatic cells is increasingly recognized.

Purpose of the Study:

  • To investigate the presence and regulation of telomerase activity in normal human endothelial cells.
  • To determine if telomerase activity in endothelial cells is linked to proliferation, cell cycle status, or in vitro culture conditions.

Main Methods:

  • Primary human endothelial cells were cultured under various conditions, including quiescence and proliferation.
  • Telomerase activity was assessed in relation to cell growth, confluency, and in vitro passaging.

Related Experiment Videos

  • The effect of nocodazole-induced G2/M cell cycle arrest on telomerase activity was examined.

    • Main Results:

    • Normal human endothelial cells exhibit detectable telomerase activity.
    • This activity was found to be growth-related, increasing with proliferation and decreasing in quiescent, confluent cultures.
    • Telomerase activity was lost upon prolonged in vitro subculturing and abolished by G2/M cell cycle arrest.

    Conclusions:

    • Telomerase activity is present and regulated by growth status in normal human endothelial cells.
    • The findings challenge the notion of telomerase being exclusively a cancer-associated enzyme.
    • Primary endothelial cell cultures provide a valuable model for studying telomerase function in normal cellular processes.