Estradiol reduces seizure-induced hippocampal injury in ovariectomized female but not in male rats

Aristea S. Galanopoulou, Elizabeth Medina Alm, Jana Velíšková

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Estrogens protect ovariectomized rats from hippocampal injury induced by kainic acid-induced status epilepticus (SE). We compared the effects of 17β-estradiol in adult male and ovariectomized female rats subjected to lithium-pilocarpine-induced SE. Rats received subcutaneous injections of 17β-estradiol (2 μg/rat) or oil once daily for four consecutive days. SE was induced 20 h following the second injection and terminated 3 h later. The extent of silver-stained CA3 and CA1 hippocampal neurons was evaluated 2 days after SE. 17β-Estradiol did not alter the onset of first clonus in ovariectomized rats but accelerated it in males. 17β-Estradiol reduced the argyrophilic neurons in the CA1 and CA3-C sectors of ovariectomized rats. In males, estradiol increased the total damage score. These findings suggest that the effects of estradiol on seizure threshold and damage may be altered by sex-related differences in the hormonal environment.

Original languageEnglish (US)
Pages (from-to)201-205
Number of pages5
JournalNeuroscience Letters
Issue number3
Publication statusPublished - May 22 2003



  • Epilepsy
  • Estrogen
  • Hippocampus
  • Lithium
  • Neuroprotection
  • Pilocarpine
  • Rat

ASJC Scopus subject areas

  • Neuroscience(all)

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