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Focus Formation: A Cell-based Assay to Determine the Oncogenic Potential of a Gene
08:18

Focus Formation: A Cell-based Assay to Determine the Oncogenic Potential of a Gene

Published on: December 31, 2014

Modulating factors in the expression of radiation-induced oncogenic transformation

E J Hall1, T K Hei

  • 1Center for Radiological Research, Columbia University College of Physicians and Surgeons, New York, NY 10032.

Environmental Health Perspectives
|August 1, 1990
PubMed

Insights

Cell culture assays evaluate oncogenic transformation potential of various agents. Factors like radiation, chemicals, and asbestos influence transformation, with some agents promoting and others inhibiting the process.

Area of Science:

  • Oncogenic transformation
  • Cellular carcinogenesis
  • Radiation biology

Background:

  • Numerous assays exist for oncogenic transformation, varying in complexity and relevance to human risk.
  • Cell culture systems offer a quantitative method to assess oncogenic potential of chemical, physical, and viral agents.
  • These systems allow identification of factors influencing cellular transformation by radiation and chemicals.

Purpose of the Study:

  • To review methods for assessing oncogenic transformation.
  • To identify factors that modulate radiation- and chemical-induced transformation.
  • To discuss potential mechanisms of oncogene activation by radiation.

Main Methods:

  • Review of existing cell culture and in vivo assays for oncogenic transformation.
  • Analysis of factors influencing radiation-induced transformation (e.g., thyroid hormone, TPA, retinoids, selenium, vitamin E, 5-aminobenzamide).
  • Examination of the interaction between alpha-particles and asbestos fibers.

Main Results:

  • Cell culture systems provide a quantitative assessment of oncogenic potential but may lack human relevance.
  • Thyroid hormone and TPA enhance radiation-induced transformation, while retinoids, selenium, vitamin E, and 5-aminobenzamide inhibit it.
  • Alpha-particles and asbestos fibers exhibit supra-additive effects on transformation incidence.

Conclusions:

  • Cell culture systems are valuable for studying factors affecting oncogenic transformation.
  • Radiation can induce transformation through mechanisms like chromosomal translocations or suppressor gene deletion.
  • Further research is needed to demonstrate oncogene activation in radiation-induced transformation.

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