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Female mice show greater aversion-resistance to ethanol than males, indicating a potential sex difference in the development of alcohol use disorders (AUD). This suggests hormones, not the estrous cycle, may influence compulsive drinking behaviors.

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Area of Science:

  • Neuroscience
  • Behavioral Science
  • Addiction Research

Background:

  • Compulsive ethanol intake is a hallmark of alcohol use disorders (AUD), affecting diagnosis and treatment.
  • Epidemiological studies indicate females may progress to AUD more rapidly than males.
  • Preclinical models are essential for understanding sex differences in addictive behaviors like compulsive alcohol consumption.

Purpose of the Study:

  • To investigate sex differences in aversion-resistant ethanol consumption using a mouse model.
  • To assess compulsive-like ethanol intake in male and female C57BL6/J mice.
  • To determine the influence of the estrous cycle on ethanol intake and aversion resistance in females.

Main Methods:

  • Utilized an aversion-resistant ethanol consumption model in C57BL6/J mice.
  • Established baseline two-bottle choice intake of ethanol versus water.
  • Adulterated ethanol solutions with increasing concentrations of quinine hydrochloride to measure aversion resistance.

Main Results:

  • Female mice required higher quinine concentrations to suppress ethanol consumption compared to males.
  • No significant effect of estrous cycle phase was observed on baseline or quinine-adulterated ethanol intake in females.
  • These findings suggest females exhibit greater resistance to negative stimuli associated with ethanol consumption.

Conclusions:

  • Female mice demonstrate a higher degree of aversion-resistance to ethanol than males.
  • The estrous cycle phase does not appear to mediate this increased aversion-resistance in females.
  • Hormonal factors, potentially threshold levels of estradiol or progesterone, or developmental effects of sex hormones, may underlie heightened aversion-resistant ethanol intake in females.