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Title: Cannabinoid receptors CB1 and CB2 form functional heteromers in the brain
Author: Callén, Lucía
Moreno Guillén, Estefanía
Barroso-Chinea, Pedro
Moreno-Delgado, David
Cortés Tejedor, Antonio
Mallol Montero, Josefa
Casadó, Vicent
Lanciego, José Luis
Franco Fernández, Rafael
Lluís i Biset, Carme
Canela Campos, Enric I.
McCormick, Peter J.
Keywords: Receptors cel·lulars
Cell receptors
Issue Date: 15-Jun-2012
Publisher: American Society for Biochemistry and Molecular Biology
Abstract: Exploring the role of cannabinoid CB2 receptors in the brain, we present evidence of CB2 receptor molecular and functional interaction with cannabinoid CB1 receptors. Using biophysical and biochemical approaches, we discovered that CB2 receptors can form heteromers with CB1 receptors in transfected neuronal cells and in rat brain pineal gland, nucleus accumbens, and globus pallidus. Within CB1-CB2 receptor heteromers expressed in a neuronal cell model, agonist co-activation of CB1 and CB2 receptors resulted in a negative cross-talk in Akt phosphorylation and neurite outgrowth. Moreover, one specific characteristic of CB1-CB2 receptor heteromers consists of both the ability of CB1 receptor antagonists to block the effect of CB2 receptor agonists and, conversely, the ability of CB2 receptor antagonists to block the effect of CB1 receptor agonists, showing a bidirectional cross-antagonism phenomenon. Taken together, these data illuminate the mechanism by which CB2 receptors can negatively modulate CB1 receptor function.
Note: Reproducció del document publicat a:
It is part of: Journal of Biological Chemistry, 2012, vol. 287, num. 25, p. 20851-20865
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ISSN: 0021-9258
Appears in Collections:Articles publicats en revistes (Bioquímica i Biomedicina Molecular)

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