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Deficits in sensory-specific devaluation task performance following genetic deletions of cannabinoid (CB1) receptor
Hans S Crombag1, Alexander W Johnson, Anne M Zimmer
1Neurogenetics and Behavior Center, Department of Psychological & Brain Sciences, The Johns Hopkins University, Baltimore, Maryland 21218, USA. h.crombag@sussex.ac.uk
Abstract:
Cannabinoid CB1 receptor is abundantly expressed throughout the CNS and is implicated in numerous physiological and behavioral functions, including appetite and feeding. In the present study, wild-type and CB1 heterozygous and homozygous knockout mice were tested on an instrumental outcome-selective devaluation task to assess changes in acquired instrumental response levels for a distinct food reward following selective satiation. Deletion of CB1 receptor, as well as reduction in CB1 expression (HET), produced deficits in outcome-selective instrumental devaluation. These results identify a critical role for CB1 receptor in the ability of animals to represent, update, and/or use sensory-specific outcome representations to alter appetitive behaviors.
Insights
The cannabinoid CB1 receptor plays a crucial role in regulating appetite and feeding behaviors. Its absence or reduction impairs the ability to adjust food choices based on satiety, impacting motivated behaviors.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
- Molecular Biology
Background:
- The cannabinoid CB1 receptor is widely distributed in the central nervous system (CNS).
- This receptor is known to influence various physiological and behavioral functions, notably appetite and feeding.
- Understanding its precise role in motivated behaviors is essential for neuroscience research.
Purpose of the Study:
- To investigate the role of the cannabinoid CB1 receptor in outcome-selective instrumental devaluation.
- To assess how alterations in CB1 receptor expression affect learned behaviors related to food rewards.
- To determine the receptor's involvement in updating and utilizing sensory-specific outcome representations.
Main Methods:
- Utilized wild-type, CB1 heterozygous (HET), and homozygous knockout mice.
- Employed an instrumental outcome-selective devaluation task.
- Assessed changes in instrumental response levels following selective satiation for a specific food reward.
Main Results:
- Deletion of the CB1 receptor led to significant deficits in outcome-selective instrumental devaluation.
- Reduced CB1 receptor expression (HET) also resulted in impaired devaluation.
- These findings indicate a critical role for CB1 in representing and updating outcome value.
Conclusions:
- The cannabinoid CB1 receptor is vital for the ability to modify appetitive behaviors based on learned outcome devaluation.
- CB1 receptor function is essential for representing, updating, and using sensory-specific information to guide feeding.
- These results highlight the receptor's importance in the neural circuitry of motivated behavior and appetite regulation.
