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Radiogenic cell transformation and carcinogenesis.

T C Yang1, K A Georgy, M Mei

  • 1Radiation Biophysics Laboratory, NASA Johnson Space Center, Houston, TX 77058, USA.

ASGSB Bulletin : Publication of the American Society for Gravitational and Space Biology
|October 1, 1995
PubMed
Summary
This summary is machine-generated.

Space radiation poses cancer risks. Studies using cell cultures, like mouse embryonic cells, investigate radiation carcinogenesis mechanisms and relative biological effectiveness (RBE) of different radiation types.

Keywords:
NASA Center JSCNASA Discipline Number 45-10NASA Discipline Radiation HealthNASA Program Radiation Health

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Area of Science:

  • Space biology
  • Radiation oncology
  • Cellular and molecular biology

Background:

  • Space travel involves exposure to various radiation types, including heavy ions, electrons, and protons.
  • Assessing the carcinogenic effects of space radiation is crucial for astronaut safety.
  • Neoplastic cell transformation studies in culture provide insights into radiation carcinogenesis.

Purpose of the Study:

  • To investigate the mechanisms of radiation carcinogenesis using cultured cell systems.
  • To determine the relative biological effectiveness (RBE) and linear energy transfer (LET) of different space radiation types.
  • To explore the role of genetic factors and cellular interactions in radiation-induced cancer.

Main Methods:

  • Utilizing cultured mammalian cells, including mouse embryonic cells (C3H10T1/2) and human epithelial cells.
  • Conducting neoplastic cell transformation assays.
  • Measuring RBE and LET relationships for various energetic particles.
  • Performing cytogenetic and molecular analyses on transformed cells.

Main Results:

  • Mouse embryonic cells (C3H10T1/2) provide reliable dose-response data for radiation transformation studies.
  • Consistent RBE and LET relationships were observed across different cell systems.
  • Human epithelial cells can be oncogenically transformed by ionizing radiation, though it requires longer expression times or multiple exposures.
  • High-LET heavy ions appear more effective than low-LET radiation in inducing cell transformation.

Conclusions:

  • Cultured cell systems are valuable tools, complementing animal models, for studying radiation carcinogenesis.
  • Understanding the RBE and LET of space radiation is key for risk assessment.
  • Further research into human epithelial cell transformation and genetic mechanisms is needed for space travel safety.