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Nmda Receptor Antagonists Attenuate the Proconvulsant Effect of Juvenile Social Isolation in Male Mice Publisher Pubmed



Amiri S1, 2 ; Hajmirzaian A1, 2 ; Aminikhoei H1, 2 ; Momeny M3 ; Shirzadian A1, 2 ; Balaei MR4 ; Zarrinrad G3 ; Ghazikhansari M1, 2 ; Azizi R1 ; Dehpour AR1, 2 ; Mehr SE1, 2
Authors
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Authors Affiliations
  1. 1. Experimental Medicine Research Center, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Hematology/Oncology and Stem Cell Transplantation Research Center, Shariati Hospital, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Department of Human Anatomy and Cell Science, College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada

Source: Brain Research Bulletin Published:2016


Abstract

Experiencing psychosocial stress in early life, such as social isolation stress (SIS), is known to have negative enduring effects on the development of the brain and behavior. In addition to anxiety and depressive-like behaviors, we previously showed that juvenile SIS increases susceptibility to pentylenetetrazole (PTZ)-induced seizures in mice through enhancing the nitrergic system activity in the hippocampus. In this study, we investigated the possible involvement of N-methyl-d-aspartate (NMDA) receptors in proconvulsant effects of juvenile SIS. Applying 4 weeks of SIS to juvenile male mice at postnatal day 21-23, we observed an increased susceptibility to PTZ as well as anxiety and depressive-like behaviors in adult mice. Intraperitoneal (i.p.) administration of NMDA receptor antagonists, MK-801 (0.05 mg/kg) and ketamine (0.5 mg/kg), reversed the proconvulsant effects of SIS in Isolated (and not social) housed animals. Co-administration of non-effective doses of nitric oxide synthase (NOS) inhibitors, 7NI (25 mg/kg) and L-NAME (10 mg/kg), with NMDA receptor antagonists, MK-801 (0.01 mg/kg) and ketamine (0.1 mg/kg) attenuated the proconvulsant effects of juvenile SIS only in isolated housed mice. Also, using real time RT-PCR, we showed that hippocampal upregulation of NR2B subunit of NMDA receptor may play a critical role in proconvulsant effects of juvenile SIS by dysregulation of NMDA/NO pathway. In conclusion, results of present study revealed that experiencing SIS during adolescence predisposes the co-occurrence of seizure disorders with psychiatric comorbidities and also, alteration of NMDA receptor structure and function in hippocampus plays a role in proconvulsant effects of juvenile SIS through enhancing the NMDA/NO pathway. © 2016 Elsevier Inc.
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