Alteration in NCX-3 immunoreactivity within the gerbil hippocampus following spontaneous seizures

  • Park, Dae-Kyoon (Department of Anatomy, College of Medicine, Soonchunhyang University) ;
  • Park, Kyung-Ho (Department of Anatomy, College of Medicine, Soonchunhyang University) ;
  • Ko, Jeong-Sik (Department of Anatomy, College of Medicine, Soonchunhyang University) ;
  • Kim, Duk-Soo (Department of Anatomy, College of Medicine, Soonchunhyang University)
  • Received : 2010.11.08
  • Accepted : 2011.02.10
  • Published : 2011.05.31


Although NCX-3 is highly expressed in the brain, the distribution of NCX-3 in the epileptic hippocampus is still controversial. Therefore, to assess the distribution and pattern of NCX-3 expression in epileptic hippocampus, we performed a comparative analysis of NCX-3 immunoreactivities in the hippocampus of seizure-resistant (SR) and seizure-sensitive (SS) gerbils. In SR gerbils, NCX-3 immunoreactivity was higher than pre-seizure SS gerbils, particularly in the pavalbumin (PV)-positive interneurons. Three h post-ictal, NCX-3 immunoreactivity in the SS gerbil hippocampus was markedly elevated to the level of SR gerbils. Six h post-ictal, the expression of NCX-3 was reduced to the level of pre-seizure SS gerbils. Therefore, the results of the present study suggest that down-regulation of NCX-3 expression in the SS gerbil hippo-campus may be involved in the hyperexcitability of SS gerbils due to an imbalance of intracellular $Na^+/Ca^{2+}$ homeostasis and $Ca^{2+}$ concentration.


Epilepsy;Gerbil;Hippocampus;Immunohistochemistry;$Na^+/Ca^{2+}$ exchanger (NCX)


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