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Related Experiment Videos

Mouse models for the study of telomerase

M A Blasco1, H W Lee, M Rizen

  • 1Department of Immunology and Oncology, Centro Nacional de Biotecnología, Madrid, Spain.

Ciba Foundation Symposium
|January 1, 1997
PubMed
Summary

Telomere maintenance by telomerase is crucial for cell viability. In mouse models, telomerase RNA increases early in pre-cancerous stages, while telomerase activity rises only in late-stage tumors.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cancer Research

Background:

  • Telomeres, the protective ends of chromosomes, are maintained by telomerase, a ribonucleoprotein-DNA polymerase.
  • Telomere length maintenance is critical for cellular viability, senescence, and immortalization.
  • The mouse serves as a model system for studying telomerase function and its role in tumorigenesis.

Purpose of the Study:

  • To investigate telomerase activity and mouse telomerase RNA (mTR) expression in transgenic mouse models of cancer.
  • To elucidate the correlation between mTR regulation and telomerase activity during tumor progression.
  • To generate mTR knockout mice to study telomerase's role in development and cancer.

Main Methods:

  • Analysis of telomerase activity and mTR expression in two transgenic mouse models (islet cell carcinoma and squamous cell carcinoma).

Related Experiment Videos

  • Comparison of mTR levels and telomerase activity in pre-neoplastic and late-stage tumors.
  • Generation and characterization of mTR knockout mice (mTR-/-) for telomerase deficiency studies.

    • Main Results:

    • Telomerase activity was detected exclusively in late-stage tumors across both models.
    • Mouse telomerase RNA (mTR) levels were elevated in pre-neoplastic stages and further increased in late-stage tumors.
    • mTR levels did not directly correlate with detected telomerase activity, indicating independent regulation.

    Conclusions:

    • Telomerase activity induction correlates with progression to late-stage tumors.
    • Upregulation of mTR is an early event in tumorigenesis.
    • mTR knockout mice provide a model for studying telomerase deficiency in development and cancer formation.