Hippocampal Glutamate Release on Learning and Memory in Teeth-loss Rats

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著者

    • MATSUNO Akihito
    • Department of Removable Prosthodontics and Occlusion, Osaka Dental University
    • INOUE Hiroshi
    • Department of Removable Prosthodontics and Occlusion, Osaka Dental University

抄録

Purpose: To clarify the effects of molar tooth loss on learning and memory, hippocampal glutamate release during a passive-avoidance task was measured with a telemetric glutamate biosensor.<br>Methods: Male Sprague-Dawley rats were used. Under general anesthesia, all the maxillary molars were extracted from the EXT group rats (n = 8); those in the CON group (control, n = 8) were anesthetized without tooth extraction. At age 7 weeks, the rats were subjected to a passive-avoidance task consisting of acquisition and retention trials. Simultaneously, hippocampal glutamate release was measured. First, during the acquisition trial, the rats were placed in a light compartment, and the duration before they entered a dark compartment was measured (reaction latency). Immediately after the rat entered the dark compartment, an electric shock was applied through a grid floor. After 24 h, the retention trial was performed, and the reaction latency was measured in the same manner. Further, a biosensor was used to measure the release of hippocampal glutamate before and after the start of each trial.<br>Results: Regarding the reaction latency during the passive-avoidance task, no significant differences were seen between the groups in the acquisition trial. Reaction latency increased in both groups in the retention trial, but was significantly shorter in the EXT group. Furthermore, hippocampal glutamate release in the acquisition trial was significantly shorter in the EXT group, but in the retention trial, no significant difference in glutamate release was seen between the groups.<br>Conclusion: Molar tooth loss may impede learning and memory.

収録刊行物

  • Prosthodontic research & practice  

    Prosthodontic research & practice 7(2), 71-77, 2008-07-01 

    Japan Prosthodontic Society

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各種コード

  • NII論文ID(NAID)
    10021954873
  • NII書誌ID(NCID)
    AA11728086
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13477021
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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