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Journal Article

Coexpression of the cannabinoid receptor type 1 with dopamine and serotonin receptors in distinct neuronal subpopulations of the adult mouse forebrain

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Hermann,  H
Max Planck Institute of Psychiatry, Max Planck Society;

Marsicano,  G
Max Planck Institute of Psychiatry, Max Planck Society;

Lutz,  B
Max Planck Institute of Psychiatry, Max Planck Society;

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Citation

Hermann, H., Marsicano, G., & Lutz, B. (2002). Coexpression of the cannabinoid receptor type 1 with dopamine and serotonin receptors in distinct neuronal subpopulations of the adult mouse forebrain. Neuroscience, 109(3), 451-460.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-A27F-B
Abstract
The cannabinoid receptor type 1 (CB1) displays unusual properties, including the dual capacity to inhibit or stimulate adenylate cyclase and a brain density considerably higher than the majority of G protein-coupled receptors. Together with overlapping expression patterns of dopamine and serotonin receptors this suggests a potential of CB1 to modulate the function of the dopamine and serotonin system. Indeed, pharmacological studies provide evidence for cross-talks between CB1 and receptors of these neurotransmitter systems. In trying to obtain further insights into possible functional and/or structural interactions between CB1 and the dopamine receptors and the serotonin receptors, we performed double- label in situ hybridization at the cellular level on mouse forebrain sections by combining a digoxigenin-labelled riboprobe for CB1 with S-35-labelled riboprobes for dopamine receptors D1 and D2. and for serotonin receptors 5-HT1B and 5- HT3, respectively. As a general rule, we found that CB1 colocalizes with D1, D2 and 5-HT1B only in low-CB1-expressing cells which are principal projecting neurons, whereas CB1 coexpression with 5-HT3 was also observed in high-CB1- expressing cells which are considered to be mostly GABAergic. In striatum and olfactory tubercle, CB1 is coexpressed to a high extent with D1, D2 and 5-HT1B. Throughout the hippocampal formation, CB1 is coexpressed with D2, 5-HT1B and 5-HT3. In the neocortex. coexpression was detected only with 5-HT1B and 5- HT3. In summary a distinct pattern is emerging for the cannabinoid system with regard to its colocalization with dopamine and serotonin receptors and, therefore. it is likely that different mechanisms underlie its cross-talk with these neurotransmitter systems. (C) 2002 IBRO. Published by Elsevier Science Ltd. All rights reserv