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Multiple pathways for the regulation of telomerase activity
S E Holt1, W E Wright, J W Shay
1Department of Cell Biology and Neuroscience, University of Texas Southwestern Medical Center, Dallas 75235-9039, USA.
European Journal of Cancer (Oxford, England : 1990)
|April 1, 1997
Summary
Telomeres protect chromosome ends, but shorten with cell division. Cancer cells use telomerase to maintain telomere length, offering a target for cancer therapy.
Area of Science:
- Molecular Biology
- Genetics
- Oncology
Background:
- Vertebrate chromosomes have protective structures called telomeres at their ends, composed of TTAGGG repeats.
- Normal somatic cells experience telomere shortening with each division due to incomplete DNA replication.
- Immortal and cancer cells counteract telomere loss by expressing telomerase, an enzyme that maintains telomere length.
Purpose of the Study:
- To investigate the role of telomerase in cancer.
- To explore telomerase as a potential therapeutic target for cancer treatment.
Main Methods:
- Analysis of telomerase activity in various human tissues and cancer types.
- Review of mechanisms regulating telomerase expression and activity.
Main Results:
- Telomerase activity is present in nearly 90% of human cancers.
- Telomerase is typically absent in normal somatic cells but active in adult testes, activated lymphocytes, and some proliferative renewal tissues.
- Telomerase activity decreases in cells that undergo terminal differentiation or quiescence.
Conclusions:
- Telomerase is a key factor in cancer cell immortality.
- Inhibiting telomerase in tumor cells could be an effective cancer treatment strategy, potentially preventing recurrence from micrometastases.
- Further research into telomerase regulation pathways is crucial for developing practical therapeutic interventions.