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Synergistic Effect Between D-Ap5 and Muscimol in the Nucleus Accumbens Shell on Memory Consolidation Deficit in Adult Male Wistar Rats: An Isobologram Analysis Publisher Pubmed



Nasehi M1 ; Ostadi E2 ; Khakpai F1 ; Ebrahimighiri M3 ; Zarrindast MR4, 5, 6
Authors
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Authors Affiliations
  1. 1. Cognitive and Neuroscience Research Center (CNRC), Tehran Medical Sciences Branch, Islamic Azad University, Tehran, Iran
  2. 2. Department of Pharmacology and Toxicology, Islamic Azad University, Pharmaceutical Science Branch (IAUPS), Tehran, Iran
  3. 3. Department of Biology, Faculty of Sciences, University of Zanjan, Zanjan, Iran
  4. 4. Iranian National Center for Addiction Studies (INCAS), Tehran University of Medical Sciences, Tehran, Iran
  5. 5. Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
  6. 6. School of Cognitive Sciences, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran

Source: Neurobiology of Learning and Memory Published:2017


Abstract

The nucleus accumbens (NAc) glutamatergic and GABAergic systems are involved in memory processes. This study was investigated the involvement of NAc shell GABAergic system on D-AP5 induced memory consolidation deficit. The elevated plus-maze (EPM) test-retest paradigm was employed to assess memory in adult male Wistar rats. The results indicated that post-training intra-NAc shell injection of bicuculline (GABAA receptor antagonist) did not alter emotional memory consolidation. However, post-training intra-NAc shell microinjection of muscimol (GABAA receptor agonist, 0.1 μg/rat) and D-AP5 (a competitive NMDA receptor antagonist, 4 μg/rat) decreased emotional memory consolidation, suggesting the drugs induced amnesia. Moreover, a sub-threshold dose of muscimol (0.05 μg/rat) potentiated the D-AP5 (2 μg/rat) response on memory consolidation impairment. On the other hand, the middle dose of bicuculline (0.25 μg/rat) reversed memory impairment induced by D-AP5 at the higher dose. Interestingly, there is a synergistic effect between D-AP5 and muscimol on impairment of emotional memory consolidation. None of the above doses changed the locomotor activity. Our results suggest that the glutamatergic and GABAergic neurons of the NAc shell interact with each other for modulation of emotional memory consolidation. © 2017 Elsevier Inc.
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