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Testing Animal Anxiety in Rats: Effects of Open Arm Ledges and Closed Arm Wall Transparency in Elevated Plus Maze Test
Published on: June 29, 2018
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Study the Effect of Endocannabinoid System on Rat Behavior in Elevated Plus-Maze.
Alireza Komaki1, Nasrin Hashemi-Firouzi2, Shiva Shojaei3
1Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran.; Department of Physiology, School of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran.
Basic and Clinical Neuroscience
|February 24, 2016
Summary
Activating the cannabinoid system, specifically CB1 receptors, reduces anxiety-like behaviors in rats. Blocking these receptors or inhibiting endocannabinoid breakdown increases anxiety, suggesting potential therapeutic strategies.
Area of Science:
- Neuroscience
- Pharmacology
- Behavioral Science
Background:
- The endocannabinoid system is implicated in anxiety regulation.
- Previous research on cannabinoid system's role in anxiety presents conflicting findings.
- The elevated plus-maze (EPM) is a standard animal model for assessing anxiety-like behaviors.
Purpose of the Study:
- To investigate the effects of CB1 receptor stimulation and blockade on anxiety.
- To determine the impact of inhibiting endocannabinoid degradation on anxiety-like behavior.
- To evaluate these effects using the elevated plus-maze (EPM) test in rats.
Main Methods:
- Male Wistar rats were divided into ten experimental groups.
- Treatments included Win-55212 (CB1 agonist), AM-251 (CB1 antagonist), and URB-597 (endocannabinoid breakdown inhibitor) at various doses.
- Animals received intraperitoneal injections 30 minutes prior to the EPM test; a saline control group was included.
Main Results:
- CB1 receptor activation (Win-55212) and inhibition of endocannabinoid degradation (URB-597) significantly increased open arm exploration in the EPM.
- CB1 receptor blockade (AM-251) significantly decreased open arm exploration, indicating anxiogenic effects.
- Locomotor activity and closed arm entries were not significantly affected by the tested substances.
Conclusions:
- Cannabinoid CB1 receptor activation demonstrates anxiolytic effects.
- Cannabinoid CB1 receptor blockade induces anxiety-like behavior.
- Modulating the cannabinoid system, particularly through potentiation, represents a potential therapeutic avenue for anxiety disorders.
