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The CRF1 receptor antagonist SSR125543 prevents stress-induced cognitive deficit associated with hippocampal dysfunction: Comparison with paroxetine and d-cycloserine

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Abstract

Rationale

The selective CRF1 (corticotropin releasing factor type 1) receptor antagonist SSR125543 has been previously shown to attenuate the long-term cognitive deficit produced by traumatic stress exposure. Memory disturbances described in post-traumatic stress disorder (PTSD) patients are believed to be associated with changes in neuronal activity, in particular at the level of the hippocampus.

Objectives

The present study aims at investigating whether the effects of SSR125543 (10 mg/kg/day for 2 weeks) on cognitive impairment induced by traumatic stress exposure are associated with changes in hippocampal excitability. Effects of SSR125543 were compared to those of the 5-HT reuptake inhibitor, paroxetine (10 mg/kg/day), and the partial N-methyl-d-aspartate (NMDA) receptor agonist, d-cycloserine (10 mg/kg/day), two compounds which have demonstrated clinical efficacy against PTSD.

Methods

Mice received two unavoidable electric foot-shocks. Then, 1 or 16 days after stress, they were tested for their memory performance using the object recognition test. Neuronal excitability was recorded during the third week post-stress in the CA1 area of the hippocampus. Drugs were administered from day 1 post-stress to the day preceding the electrophysiological study.

Results

Application of electric shocks produced cognitive impairment 16, but not 1 day after stress, an effect which was associated with a decrease in hippocampal neuronal excitability. Both stress-induced effects were prevented by repeated administration of SSR125543, paroxetine and d-cycloserine.

Conclusions

These findings confirm that the CRF1 receptor antagonist SSR125543 is able to attenuate the behavioral effects of traumatic stress exposure and indicate that these effects are associated with a normalization of hippocampal neuronal excitability impaired by stress.

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Acknowledgments

We thank Drs. Bruno Biton, Christophe Lanneau and Philippe Pichat for their advice, and Pauline Cervello, and Nicolas Redon for technical help with the electrophysiological studies.

Conflict of interest

This study was sponsored by Sanofi. Julie Philbert and Guy Griebel are employees of Sanofi. Catherine Belzung has no financial interests to disclose.

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Authors and Affiliations

  1. Sanofi, Exploratory Unit, 1, Avenue Pierre Brossolette, 91385, Chilly-Mazarin, France

    J. Philbert & G. Griebel

  2. INSERM U-930, Université François Rabelais Tours, UFR Sciences et Techniques, Parc Grandmont, Tours, France

    C. Belzung

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  1. J. Philbert
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Correspondence to G. Griebel.

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Philbert, J., Belzung, C. & Griebel, G. The CRF1 receptor antagonist SSR125543 prevents stress-induced cognitive deficit associated with hippocampal dysfunction: Comparison with paroxetine and d-cycloserine. Psychopharmacology 228, 97–107 (2013). https://doi.org/10.1007/s00213-013-3020-1

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