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The endocannabinoid system is altered in the post-mortem prefrontal cortex of alcoholic subjects

AutorErdozain, Amaia M.; Valdizán, Elsa M. ; Pazos, Ángel ; Meana, J. J.; Callado, Luis F.
Palabras claveAlcoholism
CB1 receptor
Human brain
Fecha de publicación2015
EditorJohn Wiley & Sons
CitaciónAddiction Biology 20(4): 773-783 (2015)
ResumenThere is strong biochemical, pharmacological and genetic evidence for the involvement of the endocannabinoid system (ECS) in alcohol dependence. However, the majority of studies have been performed in animal models. The aim of the present study was to assess the state of the CB<inf>1</inf> receptor, the enzymes fatty acid amide hydrolase (FAAH) and monoacylglycerol lipase (MAGL), and the extracellular signal-regulated kinase (ERK) and cyclic-AMP response element-binding protein (CREB) in the post-mortem prefrontal cortex of alcoholic subjects. Experiments were performed in samples from 44 subjects classified in four experimental groups: (1) non-suicidal alcoholic subjects (n=11); (2) suicidal alcoholic subjects (n=11); (3) non-alcoholic suicide victims (n=11); and (4) control subjects (n=11). We did not observe statistically significant differences in CB<inf>1</inf> mRNA relative expression among the four experimental groups. Conversely, our results showed an increase in CB<inf>1</inf> receptor protein expression in the prefrontal cortex of the suicidal alcoholic group (127.2±7.3%), with no changes in functionality with regard to either G protein activation or the inhibition of adenylyl cyclase. In parallel, alcoholic subjects presented lower levels of MAGL activity, regardless of the cause of death. A significant decrease in the active form of ERK and CREB levels was also observed in both alcoholic groups. Taken together, our data are consistent with a role for the ECS in the neurobiological mechanisms underlying alcoholism. Moreover, the alterations reported here should be of great interest for the therapeutic treatment of this chronic psychiatric disease.
Identificadoresdoi: 10.1111/adb.12160
e-issn: 1369-1600
issn: 1355-6215
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