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Related Experiment Videos

Telomerase as a growth-promoting factor.

Vera Gorbunova1, Andrei Seluanov

  • 1Department of Biochemistry and Molecular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, Texas, USA. gorbunova@bcm.tmc.edu

Cell Cycle (Georgetown, Tex.)
|September 25, 2003
PubMed
Summary

Telomerase offers crucial functions beyond telomere maintenance, including promoting cell survival and growth, even under adverse conditions. Its catalytic subunit (hTERT) overexpression can induce a senescence-like state, suggesting non-telomeric roles in cell proliferation.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Telomerase is primarily known for its role in maintaining telomere length, crucial for cellular replication.
  • Emerging evidence suggests telomerase has functions beyond telomere maintenance, impacting cell survival and cancer development.
  • The catalytic subunit of telomerase, human telomerase reverse transcriptase (hTERT), is frequently overexpressed in various cancers.

Purpose of the Study:

  • To investigate the non-telomeric functions of telomerase.
  • To explore how telomerase promotes cell survival and growth, independent of telomere lengthening.
  • To understand the role of hTERT overexpression in inducing cellular phenotypes like senescence.

Main Methods:

  • Analysis of telomerase activity in various cellular contexts.

Related Experiment Videos

  • Investigating the effects of hTERT overexpression on cell survival pathways.
  • Comparing cellular responses to hTERT overexpression with oncogene-induced senescence.

    • Main Results:

    • Telomerase actively protects cells from apoptosis and necrosis.
    • Telomerase promotes cellular growth and survival, particularly under stressful conditions.
    • Gross overexpression of hTERT can trigger a senescence-like phenotype in normal fibroblasts, mimicking oncogene effects.

    Conclusions:

    • Telomerase possesses significant non-telomeric functions that contribute to cell survival and proliferation.
    • These functions, including protection against cell death and growth stimulation, are critical in tumorigenesis.
    • The ability of hTERT to induce senescence independently of telomere length highlights its multifaceted role in cancer biology.