Abstract
Rationale
Recent evidence suggests that in addition to controlling emotional behavior in general, endocannabinoid signaling is engaged in shaping behavioral responses to challenges. This important function of endocannabinoids is still poorly understood.
Objectives
Here we investigated the impact of blockade of fatty acid amide hydrolase (FAAH), the degrading enzyme of anandamide on behavioral responses induced by challenges of different intensity.
Methods
Mice treated with FAAH inhibitor URB597 were either manually restrained on their backs (back test) or received foot-shocks.
Results
The behavior of mice showed bimodal distribution in the back test: they either predominantly showed escape attempts or equally distributed time between passivity and escape. URB597 increased escapes in animals with low escape scores. No effects were noticed in mice showing high escape scores, which is likely due to a ceiling effect. We hypothesized that stronger stressors would wash out individual differences in coping; therefore, we exposed mice to foot-shocks that decreased locomotion and increased freezing in all mice. URB597 ameliorated both responses. The re-exposure of mice to the shock cage 14 days later without delivering shocks or treatment was followed by reduced and fragmented sleep as shown by electrophysiological recordings. Surprisingly, sleep was more disturbed after the reminder than after shocks in rats receiving vehicle before foot-shocks. These reminder-induced disturbances were abolished by URB597 administered before shocks.
Conclusions
These findings suggest that FAAH blockade has an important role in the selection of behavioral responses under challenging conditions and—judging from its long-term effects—that it influences the cognitive appraisal of the challenge.
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Acknowledgments
This research was made possible by grants from EEA and Norway Grants 110/2008 to SK and ERC-2011-ADG-294313 (SERRACO) grant to JH. Neither author reported biomedical financial interests or potential conflicts of interest.
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Haller, J., Aliczki, M., Pelczer, K.G. et al. Effects of the fatty acid amide hydrolase inhibitor URB597 on coping behavior under challenging conditions in mice. Psychopharmacology 231, 593–601 (2014). https://doi.org/10.1007/s00213-013-3273-8
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DOI: https://doi.org/10.1007/s00213-013-3273-8