Effects of long-term agomelatine treatment on the cognitive performance and hippocampal plasticity of adult rats


Özkay Ü. D., Söztutar E., CAN Ö. D., Üçel U. I., ÖZTÜRK Y., ULUPINAR E.

Behavioural Pharmacology, vol.26, no.5, pp.469-480, 2015 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 26 Issue: 5
  • Publication Date: 2015
  • Doi Number: 10.1097/fbp.0000000000000153
  • Journal Name: Behavioural Pharmacology
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.469-480
  • Keywords: agomelatine, Golgi-Cox, hippocampus, Morris water maze, rat, spine, stereology, EVOKED GLUTAMATE RELEASE, SEPTO-TEMPORAL AXIS, DENDRITIC SPINES, PREFRONTAL/FRONTAL CORTEX, ANTIDEPRESSANT TREATMENT, DENTATE GYRUS, CELL-SURVIVAL, DOUBLE-BLIND, STRESS, NEUROGENESIS
  • Anadolu University Affiliated: Yes

Abstract

© Copyright 2015 Wolters Kluwer Health, Inc. All rights reserved.Agomelatine is an antidepressant with a distinct pharmacological mechanism of action as an MT1 and MT2 receptor agonist and as a 5-HT 2C receptor antagonist. We evaluated the chronic effects of agomelatine administration (40 mg/kg, 20 weeks) on the cognitive performance of rats in the Morris water maze task. We applied unbiased stereological quantification methods to estimate the total numbers of granular and pyramidal neurons located in the dorsal hippocampus. We also analyzed the dendritic spines of pyramidal neurons in the CA1 region using the Golgi-Cox impregnation method. The agomelatine-treated group found the hidden platform more quickly than did the control group and spent significantly more time in the target quadrant. Agomelatine administration caused significant volumetric and numerical enhancements in granular and pyramidal neurons in the dentate gyrus and CA1-3 subregions, respectively. Increased densities of the mushroom and stubby types of spines, with no alteration in the thin-shaped spines, were observed in the agomelatine-treated group. These results showed that long-term agomelatine administration induced a nootropic effect supported by structural changes. Enhancement of the more stable types of dendritic spines might indicate improved adaptive capacity in hippocampal neurons. Future studies will provide a better understanding of the effect of this drug on synaptic plasticity.