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The antidepressant agomelatine blocks the adverse effects of stress on memory and enables spatial learning to rapidly increase neural cell adhesion molecule (NCAM) expression in the hippocampus of rats

  • Lisa Conboy (a1), Cihan Tanrikut (a1), Phillip R. Zoladz (a2) (a3) (a4), Adam M. Campbell (a5), Collin R. Park (a2) (a3) (a4), Cecilia Gabriel (a6), Elisabeth Mocaer (a6), Carmen Sandi (a1) and David M. Diamond (a2) (a7) (a3) (a4)...
Abstract
Abstract

Agomelatine, a novel antidepressant with established clinical efficacy, acts as a melatonin receptor agonist and 5-HT2C receptor antagonist. As stress is a significant risk factor in the development of depression, we sought to determine if chronic agomelatine treatment would block the stress-induced impairment of memory in rats trained in the radial-arm water maze (RAWM), a hippocampus-dependent spatial memory task. Moreover, since neural cell adhesion molecule (NCAM) is known to be critically involved in memory consolidation and synaptic plasticity, we evaluated the effects of agomelatine on NCAM, and polysialylated NCAM (PSA-NCAM) expression in rats given spatial memory training with or without predator stress. Adult male rats were pre-treated with agomelatine (10 mg/kg i.p., daily for 22 d), followed by a single day of RAWM training and memory testing. Rats were given 12 training trials and then they were placed either in their home cages (no stress) or near a cat (predator stress). Thirty minutes later the rats were given a memory test trial followed immediately by brain extraction. We found that: (1) agomelatine blocked the predator stress-induced impairment of spatial memory; (2) agomelatine-treated stressed, as well as non-stressed, rats exhibited a rapid training-induced increase in the expression of synaptic NCAM in the ventral hippocampus; and (3) agomelatine treatment blocked the water-maze training-induced decrease in PSA-NCAM levels in both stressed and non-stressed animals. This work provides novel observations which indicate that agomelatine blocks the adverse effects of stress on hippocampus-dependent memory and activates molecular mechanisms of memory storage in response to a learning experience.

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Corresponding author
Address for correspondence: Dr L. Conboy, Laboratory of Behavioural Genetics, Brain Mind Institute, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland. Tel.: +41 21 693 16 75Fax: +41 21 693 96 37E-mail: Lisa.Conboy@epfl.ch
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