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Article

Mitigating effects of L‑selenomethionine on low‑dose iron ion radiation‑induced changes in gene expression associated with cellular stress

  • Authors:
    • Manunya Nuth
    • Ann R. Kennedy
  • View Affiliations / Copyright

    Affiliations: Department of Radiation Oncology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA
  • Pages: 35-42
    |
    Published online on: May 23, 2013
       https://doi.org/10.3892/ol.2013.1362
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Abstract

Ionizing radiation associated with highly energetic and charged heavy (HZE) particles poses a danger to astronauts during space travel. The aim of the present study was to evaluate the patterns of gene expression associated with cellular exposure to low‑dose iron ion irradiation, in the presence and absence of L‑selenomethionine (SeM). Human thyroid epithelial cells (HTori‑3) were exposed to low‑dose iron ion (1 GeV/n) irradiation at 10 or 20 cGy with or without SeM pretreatment. The cells were harvested 6 and 16 h post‑irradiation and analyzed by the Affymetrix U133Av2 gene chip arrays. Genes exhibiting a 1.5‑fold expression cut‑off and 5% false discovery rate (FDR) were considered statistically significant and subsequently analyzed using the Database for Annotation, Visualization and Integrated Discovery (DAVID) for pathway analysis. Representative genes were further validated by real‑time RT‑PCR. Even at low doses of radiation from iron ions, global genome profiling of the irradiated cells revealed the upregulation of genes associated with the activation of stress‑related signaling pathways (ubiquitin‑mediated proteolysis, p53 signaling, cell cycle and apoptosis), which occurred in a dose‑dependent manner. A 24-h pretreatment with SeM was shown to reduce the radiation effects by mitigating stress‑related signaling pathways and downregulating certain genes associated with cell adhesion. The mechanism by which SeM prevents radiation‑induced transformation in vitro may involve the suppression of the expression of genes associated with stress‑related signaling and certain cell adhesion events.
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Copy and paste a formatted citation
Spandidos Publications style
Nuth M and Kennedy AR: Mitigating effects of L‑selenomethionine on low‑dose iron ion radiation‑induced changes in gene expression associated with cellular stress. Oncol Lett 6: 35-42, 2013.
APA
Nuth, M., & Kennedy, A.R. (2013). Mitigating effects of L‑selenomethionine on low‑dose iron ion radiation‑induced changes in gene expression associated with cellular stress. Oncology Letters, 6, 35-42. https://doi.org/10.3892/ol.2013.1362
MLA
Nuth, M., Kennedy, A. R."Mitigating effects of L‑selenomethionine on low‑dose iron ion radiation‑induced changes in gene expression associated with cellular stress". Oncology Letters 6.1 (2013): 35-42.
Chicago
Nuth, M., Kennedy, A. R."Mitigating effects of L‑selenomethionine on low‑dose iron ion radiation‑induced changes in gene expression associated with cellular stress". Oncology Letters 6, no. 1 (2013): 35-42. https://doi.org/10.3892/ol.2013.1362
Copy and paste a formatted citation
x
Spandidos Publications style
Nuth M and Kennedy AR: Mitigating effects of L‑selenomethionine on low‑dose iron ion radiation‑induced changes in gene expression associated with cellular stress. Oncol Lett 6: 35-42, 2013.
APA
Nuth, M., & Kennedy, A.R. (2013). Mitigating effects of L‑selenomethionine on low‑dose iron ion radiation‑induced changes in gene expression associated with cellular stress. Oncology Letters, 6, 35-42. https://doi.org/10.3892/ol.2013.1362
MLA
Nuth, M., Kennedy, A. R."Mitigating effects of L‑selenomethionine on low‑dose iron ion radiation‑induced changes in gene expression associated with cellular stress". Oncology Letters 6.1 (2013): 35-42.
Chicago
Nuth, M., Kennedy, A. R."Mitigating effects of L‑selenomethionine on low‑dose iron ion radiation‑induced changes in gene expression associated with cellular stress". Oncology Letters 6, no. 1 (2013): 35-42. https://doi.org/10.3892/ol.2013.1362
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