Epigenetic and proteomic expression changes promoted by eating addictive-like behavior

Samantha Mancino, Aurelijus Burokas, Javier Gutiérrez-Cuesta, Miriam Gutiérrez-Martos, Elena Martín-García, Mariangela Pucci, Anastasia Falconi, Claudio D'Addario, Mauro Maccarrone, Rafael Maldonado

Research output: Contribution to journalArticlepeer-review

Abstract

An increasing perspective conceptualizes obesity and overeating as disorders related to addictive-like processes that could share common neurobiological mechanisms. In the present study, we aimed at validating an animal model of eating addictive-like behavior in mice, based on the DSM-5 substance use disorder criteria, using operant conditioning maintained by highly palatable chocolate-flavored pellets. For this purpose, we evaluated persistence of food-seeking during a period of non-availability of food, motivation for food, and perseverance of responding when the reward was associated with a punishment. This model has allowed identifying extreme subpopulations of mice related to addictive-like behavior. We investigated in these subpopulations the epigenetic and proteomic changes. A significant decrease in DNA methylation of CNR1 gene promoter was revealed in the prefrontal cortex of addict-like mice, which was associated with an upregulation of CB 1 protein expression in the same brain area. The pharmacological blockade (rimonabant 3 mg/kg; i.p.) of CB 1 receptor during the late training period reduced the percentage of mice that accomplished addiction criteria, which is in agreement with the reduced performance of CB 1 knockout mice in this operant training. Proteomic studies have identified proteins differentially expressed in mice vulnerable or not to addictive-like behavior in the hippocampus, striatum, and prefrontal cortex. These changes included proteins involved in impulsivity-like behavior, synaptic plasticity, and cannabinoid signaling modulation, such as alpha-synuclein, phosphatase 1-alpha, doublecortin-like kinase 2, and diacylglycerol kinase zeta, and were validated by immunoblotting. This model provides an excellent tool to investigate the neurobiological substrate underlying the vulnerability to develop eating addictive-like behavior.

Original languageEnglish
Pages (from-to)2788-2800
Number of pages13
JournalNeuropsychopharmacology
Volume40
Issue number12
DOIs
Publication statusPublished - May 6 2015

ASJC Scopus subject areas

  • Pharmacology
  • Psychiatry and Mental health

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