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Age-Dependent Differences in Cerebellar CB1 Receptor Expression and Its Association With Impulsivity and Alcohol

Johana P Gómez-Villatoro1, Yalitza A Alvarado-Ramirez1, Octavio Amancio-Belmont2

  • 1Laboratorio de Ontogenia y Adicciones, Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico.

Addiction Biology
|November 30, 2025
PubMed
Summary

Cannabinoid receptor 1 (CB1R) in the cerebellum, specifically Crus II, regulates adolescent impulsivity and alcohol consumption. This highlights a novel brain region and developmental period for cannabinoid system modulation.

Keywords:
adolescenceagedalcohol use disordercannabinoid one receptorcerebellumimpulsivity

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Addiction Research

Background:

  • Cannabinoid receptor 1 (CB1R) is implicated in impulsivity and alcohol use, primarily studied in the hippocampus.
  • The cerebellum, with its high CB1R density, has an unexplored role in these behaviors.

Purpose of the Study:

  • To investigate the role of cerebellar CB1R in regulating impulsive behavior, alcohol consumption, and alcohol seeking.
  • To determine if CB1R expression in specific cerebellar regions correlates with age-related changes in impulsivity and alcohol intake.

Main Methods:

  • Male Wistar rats of adolescent, adult, and aged groups were assessed using the delay discounting task (DDT) and alcohol place preference (ACPP).
  • CB1R expression was quantified via immunofluorescence in the cerebellar Crus II and interposed nucleus.
  • Voluntary alcohol consumption was measured in separate cohorts.

Main Results:

  • Adolescent rats exhibited significantly higher impulsivity and alcohol consumption than adult and aged rats.
  • Only adolescent rats developed alcohol-conditioned place preference (ACPP).
  • CB1R expression peaked in adolescents, with Crus II levels correlating positively with impulsivity (k value).

Conclusions:

  • Cerebellar CB1R, particularly in Crus II, selectively influences adolescent impulsive choice and alcohol consumption/seeking.
  • This study identifies a novel brain locus and a critical developmental window for endocannabinoid system modulation in addiction-related behaviors.