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Epigenetic and Proteomic Expression Changes Promoted by Eating Addictive-Like Behavior.

Samantha Mancino1, Aurelijus Burokas1, Javier Gutiérrez-Cuesta1

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Summary

This study validates an animal model for addictive-like eating behaviors, revealing epigenetic changes in the brain

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Area of Science:

  • Neuroscience
  • Behavioral Science
  • Molecular Biology

Background:

  • Obesity and overeating are increasingly viewed through the lens of addictive-like processes.
  • Common neurobiological mechanisms may underlie substance use disorders and addictive-like eating behaviors.

Purpose of the Study:

  • To validate an animal model for addictive-like eating behavior in mice.
  • To investigate the neurobiological and epigenetic underpinnings of this behavior using DSM-5 criteria.

Main Methods:

  • Operant conditioning with palatable food pellets was used to model addictive-like eating.
  • Evaluated food-seeking persistence, motivation, and response perseverance under punishment.
  • Analyzed epigenetic (DNA methylation) and proteomic changes in specific brain regions.

Main Results:

  • A validated animal model identified distinct subpopulations of mice exhibiting addictive-like eating behavior.
  • Decreased DNA methylation of the CNR1 gene promoter and increased CB1 protein in the prefrontal cortex were observed in addict-like mice.
  • Pharmacological blockade of CB1 receptors and CB1 knockout mice showed reduced addictive-like behaviors.
  • Proteomic analysis revealed differential protein expression in vulnerable mice, including those related to impulsivity and synaptic plasticity.

Conclusions:

  • The validated animal model serves as a valuable tool for studying the neurobiology of addictive-like eating behaviors.
  • Cannabinoid signaling plays a significant role in the development of addictive-like eating patterns.
  • Epigenetic modifications and specific protein changes are associated with vulnerability to addictive-like eating.