Damage of hippocampal neurons caused by cobalt focus in the cerebral cortex of rats

  • Sugaya E
  • Ishige A
  • Sediguchi K
 et al. 
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The relationship between the focus of cobalt seizures in the cerebral cortex and neuron loss in the hippocampus, as well as the CD50of pentylenetetrazol was examined in rats. Spike activity in EEG frequently appeared 4 days after cobalt application and reached a peak 8-16 days after cobalt application, which was sometimes accompanied by jerks in the limbs. Changes in the CD50value showed a two-step pattern, i.e., the first decrease in CD50appeared one day after application of cobalt and continued at the same value until the fourth day. Then a second gradual decrease of CD50was observed from the fourth day to eighth day and continued at the same value until 20 days after cobalt application. Neuron loss in the CA1 area of the hippocampus was observed as early as two days after cobalt application and the degree of neuron loss progressively increased until the 20th day. These findings suggest that neuron loss in the hippocampus following cobalt-induced seizures is not a result of generalized convulsions. © 1988.

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  • Eiichi Sugaya

  • Atsuchi Ishige

  • Kyoji Sediguchi

  • Mitsutoshi Yuzurihara

  • Susumu Iizuka

  • Akira Sugimoto

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