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Related Experiment Videos

Human ageing and telomeres

C B Harley1

  • 1Geron Corporation, Menlo Park, CA 94025, USA.

Ciba Foundation Symposium
|January 1, 1997
PubMed
Summary
This summary is machine-generated.

Telomerase is normally repressed in human cells, but reactivated in cancer. This enzyme

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Area of Science:

  • Cellular biology
  • Molecular biology
  • Gerontology

Background:

  • Telomerase expression is repressed in normal human somatic cells but reactivated in cancer.
  • The telomere hypothesis links telomere shortening to cell senescence and telomerase reactivation to immortalization.
  • Telomere dynamics are crucial in cellular aging and cancer development.

Purpose of the Study:

  • To investigate the role of telomerase in cellular aging and cancer.
  • To examine telomere length and telomerase activity across various human tissues and aging processes.
  • To evaluate the evolutionary implications of telomerase repression and mortality.

Main Methods:

  • Measurement of telomere length and telomerase activity in diverse human tissues (skin, blood, CNS, etc.).

Related Experiment Videos

  • Analysis of cellular aging and transformation in tissue culture models.
  • Comparative analysis across normal, accelerated aging, and cancer conditions.

    • Main Results:

    • Data from various tissues support the telomere hypothesis of aging and immortalization.
    • Telomere shortening triggers senescence in normal cells; telomerase reactivation enables immortalization.
    • Tissue culture studies confirm the role of telomere dynamics in cell aging and transformation.

    Conclusions:

    • Telomerase repression is a tumor-suppressive mechanism with early benefits.
    • However, this repression contributes to age-related diseases later in life (antagonistic pleiotropy).
    • Evolutionary strategies balance cancer prevention with aging-related decline.