Alterations of NR2B and PSD-95 expression in hippocampus of kainic acid-exposed rats with behavioural deficits

作者：Sun, Qin-Jian^*; Duan, Rui-Sheng; Wang, Ai-Hua; Shang, Wei; Zhang, Tao; Zhang, Xiu-Qing; Chi, Zhao-Fu

来源：Behavioural Brain Research, 2009, 201(2): 292-299.

DOI：10.1016/j.bbr.2009.02.027

• Spontaneous recurrent seizure
• Behavioural deficits
• Hippocampus
• Receptors, N-Methyl-D-aspartate
• NR2B subunit
• Postsynaptic density protein-95

Temporal lobe epilepsy (TLE), characterized by spontaneous recurrent seizure (SRS), is associated with behavioural problems, but the underlying molecular mechanisms have not been clearly identified. In the present study, kainic acid (KA) was administered systemically in adult male Wistar rats to induce SRS. Behavioural performance analyses at 2, 4, and 6 weeks post-status epilepticus (post-SE) showed spatial learning memory deficit, anxiety and increased locomotor activity in rats with long-term SRS compared with rats without SRS after normal saline (NS) or KA-valproate (KA-VPA) treatment. No neuronal cell loss was observed in the hippocampus at 6 weeks post-SE. Reverse transcriptase polymerase chain reaction (RT-PCR) and Western blot analyses revealed that down-regulation of NMDA receptor subunit 2B (NR2B) and postsynaptic density protein-95 (PSD-95) expression in adult hippocampus was found at 4 weeks post-SE and a further decrease at 6 weeks post-SE compared with rats without SRS after NS or KA-VPA treatment. Furthermore, the decreased expression of NR2B and PSD-95 was correlated with the representatively behavioural deficit. These findings suggest that long-term SRS might decrease NR2B/PSD-95 expression in adult hippocampus and consequently cause behavioural deficits, including spatial learning memory deficit, anxiety and increased locomotor activity. Maintaining the expression of NR2B/PSD-95 might partially contribute to the normal behaviour in rats with long-term SRS.

• 出版日期2009-8-12
• 单位山东大学; 山东省千佛山医院