Study examines effects of combined alcohol and stress exposure on prefrontal cortex function

Drinking alcohol results in an alcohol use disorder (AUD) when consumption becomes excessive and dependence develops. Both stress and anxiety can contribute to the development of an AUD. Chronic stress can increase drinking, and chronic drinking can elevate anxiety and dysregulate normal responses to stressors. Behavioral flexibility and adaptive behavior – essential for controlling excessive drinking – are core functions of the prefrontal cortex (PFC), This study used mice to examine the effects of combined alcohol and stress exposure on PFC function.

Researchers trained adult male mice to drink alcohol (15% v/v) on a one-hour-per-day/one-bottle schedule. Once their drinking was stable, mice were exposed to cycles of chronic intermittent alcohol or air vapor, followed by test cycles of one-hour-per-day drinking. Four hours before each test, the mice were exposed to either no-stress, or 10 minutes of forced swim stress. After two cycles of exposure, the study authors assessed PFC-dependent cognition, and at the end of the study, the mouse brains were examined for markers of neural activity.

The researchers found evidence of rapid disruptions in signaling across cognitive networks and impairments in two tests of PFC-dependent cognitive function in mice exposed to both alcohol and stress. Identifying the cognitive consequences of stress and alcohol may make it possible to develop treatments for AUD that work by restoring cognitive control over drinking behavior. Future research should examine gender-specific changes in cognition and neural function associated with the interaction of alcohol and stress, as demonstrated in male mice here.

Advertisement

Comments

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of News-Medical.Net.
Post a new comment
Post
You might also like... ×
Stress may just as harmful to our body as bad diet, BYU study finds