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Related Experiment Videos

Bystander effect: biological endpoints and microarray analysis.

M Ahmad Chaudhry1

  • 1Department of Medical Laboratory and Radiation Sciences, College of Nursing and Health Sciences, University of Vermont, 302 Rowell Building, Burlington, VT 05405, USA. mchaudhr@uvm.edu

Mutation Research
|January 18, 2006
PubMed
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Ionizing radiation causes damage in non-irradiated cells through the bystander effect. This study used gene expression analysis to identify signaling pathways involved in this radiation-induced cellular communication.

Area of Science:

  • Cellular and Molecular Biology
  • Radiation Biology
  • Genomics

Background:

  • Ionizing radiation exposure can induce biological effects in a larger cell proportion than directly traversed.
  • The bystander effect describes irradiated cells signaling to unirradiated neighbors, causing damage.
  • This effect has implications for carcinogenesis and radiation exposure risk assessment.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the radiation-induced bystander effect.
  • To identify signaling pathways and gene expression changes in bystander cells.
  • To differentiate molecular responses in directly irradiated versus bystander cells.

Main Methods:

  • Utilized microarray technology to examine gene expression alterations.

Related Experiment Videos

  • Employed a model system using medium from irradiated normal human diploid lung fibroblasts.
  • Analyzed gene expression profiles in bystander cells exposed to conditioned medium.

    • Main Results:

    • Radiation-induced gene expression in directly irradiated cells differed from that in bystander cells.
    • Several genes were upregulated in bystander cells receiving medium from irradiated cells; none were downregulated.
    • Upregulated genes in bystander cells included those involved in extracellular signaling, growth factors, receptors, and cell communication.

    Conclusions:

    • The molecular pathways mediating biological effects in bystander cells differ from those in directly irradiated cells.
    • Gene expression analysis revealed the upregulation of cell communication and receptor-related genes in bystander cells.
    • These findings support the active involvement of extracellular signaling and cell communication in mediating the radiation bystander effect.