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Related Experiment Videos

Microarray analysis of selenium-depleted and selenium-supplemented mice.

L A Hooven1, J Butler, L W Ream

  • 1Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA.

Biological Trace Element Research
|January 31, 2006
PubMed
Summary
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Selenium deficiency in mice impacts gene expression in muscles, affecting immune and cellular pathways. Supplementation with sodium selenate partially restored normal gene activity, highlighting selenium

Area of Science:

  • Nutritional biochemistry
  • Molecular biology
  • Genomics

Background:

  • Nutritional selenium deficiency is linked to Keshan disease in humans and white muscle disease in livestock.
  • Understanding selenium's role in gene expression is crucial for preventing related health issues.

Purpose of the Study:

  • To investigate the effects of chronic selenium deficiency and repletion on gene expression in mouse muscle.
  • To identify specific genes and pathways affected by selenium levels using DNA microarrays.

Main Methods:

  • Mice were fed a selenium-deficient diet for three generations.
  • Third-generation female mice received water with no added selenium, 0.1 ppm, or 1.0 ppm selenium as sodium selenate.
  • DNA microarrays were employed to compare gene expression profiles in muscle tissue.

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Main Results:

  • Selenium repletion led to significant changes in gene expression.
  • Upregulated genes included Ptger2, Tcrb-V13, Tcf-7, and Lck, involved in immune and cellular signaling.
  • Vav2, a mouse oncogene, showed decreased expression with selenium-containing diets.

Conclusions:

  • Chronic selenium deficiency alters muscle gene expression, impacting immune and cellular functions.
  • Selenium repletion, particularly with sodium selenate, can modulate these gene expression patterns.
  • Findings suggest a role for selenium in regulating specific oncogenes and immune-related genes.