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Related Experiment Videos

The bystander effect.

Eric J Hall1

  • 1Columbia University, Center for Radiological Research, 630 West 168th Street, New York, NY 10032, USA. ejh1@columbia.edu

Health Physics
|July 11, 2003
PubMed
Summary
This summary is machine-generated.

The bystander effect shows radiation can harm cells indirectly. This radiation-induced bystander effect, observed in medium transfer and microbeam experiments, suggests a larger biological target than individual cells.

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Area of Science:

  • Radiobiology
  • Cellular Biology
  • Radiation Oncology

Background:

  • The bystander effect describes biological impacts on non-irradiated cells due to radiation exposure of neighboring cells.
  • Existing research presents two distinct experimental approaches: medium transfer from irradiated cells and microbeam irradiation of specific cells.

Purpose of the Study:

  • To review and compare findings from medium transfer and microbeam experiments investigating the radiation-induced bystander effect.
  • To discuss the implications of bystander effects for understanding radiation damage and risk extrapolation.

Main Methods:

  • Review of experiments involving medium transfer from irradiated cells to assess bystander effects.
  • Analysis of studies using single-particle microbeams to target specific cells and observe effects on neighbors via gap junctions.
Keywords:
Non-programmatic

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Main Results:

  • Medium transfer experiments demonstrate bystander effects for cell lethality, chromosomal aberrations, and cell cycle delay, influenced by cell type.
  • Microbeam studies confirm bystander effects for chromosomal aberrations, cell lethality, mutation, and oncogenic transformation, with gap junction communication significantly amplifying the effect.
  • The bystander effect is observed for both high- and low-linear energy transfer (LET) radiation, being more pronounced with densely ionizing radiation like alpha particles.

Conclusions:

  • The bystander effect indicates that radiation's biological target may extend beyond directly hit cells.
  • Findings challenge the linear extrapolation of radiation risks from high to low doses, suggesting a more complex dose-response relationship.
  • Further research is needed to investigate bystander effects in three-dimensional normal tissues.