Related Experiment Video
Updated: Aug 5, 2026
07:13
The Unpredictable Chronic Mild Stress Protocol for Inducing Anhedonia in Mice
Published on: October 24, 2018
THE CANNABINOID AGONIST HU 210 MODIFIES RAT BEHAVIOURAL RESPONSES TO NOVELTY AND STRESS
1Department of Biomedical Sciences, Division of Pharmacology, University of Modena, via G. Campi 287, Modena, I-41100, Italy
Pharmacological Research
|March 14, 2000
Summary
Sub-chronic cannabinoid agonist HU 210 treatment in rats induced anxiogenic-like effects and persistent emotional responses in novel environments. These effects, including altered locomotor activity and grooming, highlight potential long-term behavioral changes after discontinuing the drug.
Area of Science:
- Neuroscience
- Behavioral Pharmacology
- Cannabinoid Research
Background:
- Cannabinoid agonists, like HU 210, interact with the endocannabinoid system.
- Understanding the long-term behavioral effects of cannabinoid agonists is crucial for assessing their therapeutic potential and risks.
Purpose of the Study:
- To investigate the acute and sub-chronic effects of the cannabinoid agonist HU 210 on rat behavior in novel environments.
- To assess the persistence of these behavioral changes during abstinence periods after treatment cessation.
Main Methods:
- Rats were administered HU 210 (25-100 µg kg(-1), i.p.) acutely and sub-chronically (9 days).
- Behavioral assessments included locomotor activity, grooming, vocalization, and responses in an X-maze and a swimming test during treatment and abstinence (24 h, 7 days).
Main Results:
- Sub-chronic HU 210 at higher doses induced anxiogenic-like effects, increasing aversion to open arms in the X-maze and wall-hugging in the swimming test.
- Locomotor activity was reduced, while grooming patterns shifted from inhibition to potentiation with sub-chronic treatment and abstinence.
- Vocalization responses were elevated, particularly after high-dose acute and sub-chronic HU 210 administration.
Conclusions:
- Sub-chronic administration of the cannabinoid agonist HU 210 can elicit anxiogenic-like effects in rats.
- Enhanced emotional responses to novel environments can persist even after the discontinuation of high-dose HU 210 treatment.
