Cadmium-induced changes in Per 1 and Per 2 gene expression in rat hypothalamus and anterior pituitary: Effect of melatonin

Jun 26, 2007Toxicology letters

Cadmium’s effects on daily rhythm genes in rat brain’s hormone control areas and how melatonin influences this

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Abstract

Chronic exposure to cadmium decreased expression of clock genes in the hypothalamic-pituitary unit of rats.

  • Cadmium treatment reduced hypothalamic Per 1 gene expression at both time intervals measured.
  • Adenohypophysial Per 1 and Per 2 gene expression was decreased by cadmium at 09:00h.
  • Hypothalamic Per 2 gene expression was also reduced by cadmium at 01:00h.
  • Melatonin administration counteracted most cadmium effects, increasing expression of hypothalamic Per 2 and adenohypophysial Per 1 and Per 2 genes.

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