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Related Experiment Videos

Telomerase activity in benign and malignant human thyroid tissues

A J Cheng1, J D Lin, T Chang

  • 1Department of Molecular and Cellular Biology, College of Medicine, Chang Gung University, Tao-Yuan, Taiwan.

British Journal of Cancer
|July 2, 1998
PubMed
Summary

Telomerase activity, crucial for cell immortalization, is reactivated during human thyroid cancer development. This reactivation is observed increasingly from benign growths to malignant tumors, indicating its role in thyroid carcinogenesis.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Telomerase is a key enzyme in synthesizing telomeres at chromosome ends.
  • Telomerase is typically repressed in normal human tissues but reactivated in cancers.
  • Telomerase activation is linked to cellular immortalization and carcinogenesis.

Purpose of the Study:

  • To investigate telomerase activity during human thyroid cancer progression.
  • To correlate telomerase reactivation with different stages of thyroid tumor development.

Main Methods:

  • Telomeric Repeat Amplification Protocol (TRAP) assay was used.
  • Analyzed tissue samples from nodular hyperplasia, adenomas, papillary carcinomas, and follicular carcinomas.
  • Quantified telomerase activity in 102 thyroid tissue samples.

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Main Results:

  • Telomerase activity was detected in 14% of nodular hyperplasias, 29% of adenomas, 52% of papillary carcinomas, and 91% of follicular carcinomas.
  • A significant increase in telomerase activity was observed with increasing tumor severity.
  • Early-stage (I/II) thyroid cancers were more frequently negative for telomerase activity.

Conclusions:

  • Telomerase reactivation is a significant event in human thyroid cancer development.
  • The progressive increase in telomerase activity suggests its role in thyroid carcinogenesis and progression.
  • Telomerase status may serve as a biomarker for thyroid cancer development.