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Related Experiment Videos

Neoplastic cell transformation by heavy ions.

M Suzuki1, M Watanabe, K Suzuki

  • 1Division of Radiation Biology, School of Medicine, Yokohama City University, Japan.

Radiation Research
|December 1, 1989
PubMed
Summary

Heavy ions like nitrogen and helium ions effectively induce neoplastic transformation in hamster cells. These ions demonstrated higher biological effectiveness compared to gamma or X rays in cell transformation studies.

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Area of Science:

  • Radiation biology
  • Cellular transformation
  • Heavy ion physics

Background:

  • Neoplastic transformation is a key step in cancer development.
  • Heavy ions are increasingly used in research and therapy.
  • Understanding their biological effects is crucial.

Purpose of the Study:

  • To investigate the induction of morphological transformation in golden hamster embryo cells using heavy ions.
  • To compare the biological effectiveness of different heavy ions (14N, 4He) with gamma and X rays.

Main Methods:

  • Irradiation of golden hamster embryo cells with 95 MeV 14N ions, 22 MeV 4He ions, and 22 MeV 4He ions with an Al absorber.
  • Assessment of neoplastic transformation based on colony morphology (dense stacking, crisscross pattern).

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  • Calculation of Relative Biological Effectiveness (RBE) relative to 60Co gamma rays.

    • Main Results:

    • 14N ions and 4He ions were more effective in inducing transformation than gamma or X rays.
    • RBE values were 3.3 for 14N ions, 2.4 for 4He ions, and 3.3 for filtered 4He ions.
    • A qualitative similarity was observed between RBE for cell death and transformation.

    Conclusions:

    • Heavy ions are potent inducers of neoplastic cell transformation.
    • The RBE-linear energy transfer relationship is consistent for both cell death and transformation.
    • Findings contribute to understanding heavy ion radiobiology for potential applications.