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Acute administration of THC impairs spatial but not associative memory function in zebrafish
Tim Ruhl1, Nicole Prinz, Nadine Oellers
1Department for Neuroethology and Sensory Ecology, Institute of Zoology, University of Bonn, Endenicher Allee 11-13, 53115, Bonn, Germany, truhl@uni-bonn.de.
Psychopharmacology
|March 19, 2014
Summary
Tetrahydrocannabinol (THC) activates Erk signaling in zebrafish brains, impairing spatial memory retrieval. This highlights the conserved role of the endocannabinoid system (ECS) in vertebrate spatial cognition.
Area of Science:
- Neuroscience
- Behavioral Pharmacology
- Zebrafish Models
Background:
- The endocannabinoid system (ECS) plays a role in memory and cognition.
- Cannabinoid receptor 1 (CB1) ligands, such as ∆-9-tetrahydrocannabinol (THC), are widely studied for their effects on the brain.
- Zebrafish (Danio rerio) are increasingly used as a model organism for studying neurological processes due to their conserved neurobiology.
Purpose of the Study:
- To investigate the effects of acute THC administration on intracellular signaling pathways in the zebrafish brain.
- To determine the impact of THC on memory retrieval from distinct memory systems in zebrafish.
- To explore the role of the ECS in spatial cognition and color discrimination learning in zebrafish.
Main Methods:
- Zebrafish were treated with THC, and changes in MAP kinases (Akt and Erk) phosphorylation were measured.
- Fish were trained in a two-alternative choice color discrimination task and a spatial maze task.
- Following memory consolidation, THC was administered, and memory retrieval was assessed.
Main Results:
- THC treatment enhanced Erk phosphorylation in the zebrafish telencephalon, indicating specific activation of this signaling pathway.
- THC did not affect performance in the color discrimination task.
- Spatial memory retrieval was significantly impaired by THC, while motor activity and anxiety-related behaviors remained unaffected.
Conclusions:
- The endocannabinoid system is functionally conserved across vertebrate evolution, as evidenced by THC's effects on zebrafish cognition.
- Zebrafish serve as a valuable model organism for studying the ECS and its role in spatial memory.
- THC's specific impairment of spatial memory suggests a crucial role for the ECS in this cognitive function.
