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TREATABLE ISCHEMIC NEURONAL DAMAGE IN THE GERBIL HIPPOCAMPUS Takaaki Kirino 1 , Akira Tamura 1 , Noriko Tomukai 1 , Keiji Sano 1 1Department of Neurosurgery, Teikyo University School of Medicine pp.1157-1163
Published Date 1986/12/1
DOI https://doi.org/10.11477/mf.1406205822

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  • Abstract
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The Mongolian gerbil is known to develop delay-ed neuronal death in the hippocampus following brief forebrain ischemia (Brain Res 239 : 57-69). Morphological, biochemical, or electrophysiologi-cal studies on this neuronal injury have shown that neurons still retain potential reversibility at the earlier period of alteration. To examine this possibility, immediately follwoing 5 min of ischemia in the gerbil, pentobarbital, diazepam, or nizofenone was injected. Seven days fol-lowing ischemic insult, animals were perfusion fixed and neuronal densitiy in the hippocampal CA1 subfield was counted. Most of the neurons in the CA1 sector survived ischemic insult when a drug was given, whereas most of them were lost without the treatment. The average neuronal density of treated groups showed a statistically significant (p<0.01) persistence compared with that of control group. The effective dosage of the drugs were 20-40 mg/kg in pentobarbital, 10-20 mg/kg in diazepam, and 12.5-25 mg/kg in nizofenone. On the other hand, when pentobarbital was injected 1 hr following ischemia, while neurons still remain intact morphologically, it showed no effect. This result indicates that the neuronal damage of "delayed neuronal death" type is reversible if treatment is instituted at an early period of cell change.


Copyright © 1986, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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