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Telomerase activity in skeletal sarcomas

G Aue1, B Muralidhar, H S Schwartz

  • 1Department of Orthopaedics, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-2550, USA.

Annals of Surgical Oncology
|November 27, 1998
PubMed
Summary

Telomerase activity was detected in 57% of skeletal tumors, suggesting it may sustain the transformed phenotype in bone cancers. However, activity varied, with most osteosarcomas showing none.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Telomerase maintains telomere length by adding repetitive sequences.
  • Somatic cells typically lack telomerase, leading to replicative senescence.
  • Cancer cells and immortalized cell lines often exhibit telomerase activity, enabling continuous proliferation.

Purpose of the Study:

  • To investigate telomerase activity in primary malignant bone tumors.
  • To compare telomerase expression in tumors versus adjacent normal tissues.

Main Methods:

  • Collected fresh tumor and normal tissue from 14 patients with various skeletal malignancies.
  • Analyzed protein extracts using a sensitive polymerase chain reaction (PCR)-based assay, the telomere repeat amplification protocol (TRAP).

Main Results:

  • Telomerase activity was present in 8 of 14 (57%) sarcoma patients.
  • Activity levels varied significantly, ranging from 0% in osteosarcoma to 11.7% in hemangiopericytoma, relative to HeLa cell controls.
  • The majority of osteosarcomas analyzed showed no detectable telomerase activity.

Conclusions:

  • Telomerase activity may be crucial for maintaining the transformed state in skeletal malignancies.
  • The level of telomerase expression differs across various bone tumor types.
  • Osteosarcomas frequently lack telomerase activity, unlike other skeletal tumors studied.

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