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Related Experiment Videos

Agent-specific ras oncogene activation in rat thyroid tumours.

N R Lemoine1, E S Mayall, E D Williams

  • 1Department of Pathology, University of Wales College of Medicine, Heath Park, Cardiff, UK.

Oncogene
|November 1, 1988
PubMed
Summary

Specific ras oncogene activation patterns were identified in rat thyroid tumors. Nitrosomethylurea (NMU) induced Ha-ras activation, while radiation exposure activated Ki-ras.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Carcinogenesis

Background:

  • Activated ras oncogenes are implicated in rodent tumor development.
  • Chemical carcinogens are common agents inducing these tumors.
  • Rat thyroid neoplasia can be induced by chemical carcinogens, radiation, or trophic stimulation.

Purpose of the Study:

  • To investigate ras oncogene activation in rat thyroid neoplasia.
  • To determine if specific oncogene activation patterns correlate with different tumor-inducing agents.

Main Methods:

  • Utilized a well-characterized rat thyroid neoplasia model.
  • Induced tumors using nitrosomethylurea (NMU), ionizing radiation, and elevated trophic stimulation.
  • Analyzed patterns of ras oncogene activation in induced tumors.

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Main Results:

  • Exclusively Ha-ras was activated in 87% of NMU-induced tumors.
  • Exclusively Ki-ras was activated in 60% of radiation-induced tumors.
  • Distinct ras oncogene activation specificities were observed based on the inducing agent.

Conclusions:

  • Ras oncogene activation patterns show striking specificity in rat thyroid neoplasia.
  • The specific ras oncogene activated is dependent on the etiological agent.
  • This finding provides insights into the molecular mechanisms of carcinogenesis.