Brain’s Immune System Linked to the Desire to Drink Alcohol

The brain's immune system plays a role in the desire to drink alcohol in the evening. Blocking the brain's immune system can decrease alcohol consumption.

The link between the brain’s immunity and the motivation to drink alcohol at night has been identified by a research team at the University of Adelaide. The team was able to switch off the impulse to drink alcohol in mice by giving a drug that blocks a specific response from the immune system in the brain.

The study published in the journal Brain, Behavior and Immunity, this research is one of the first of its kind to show a link between the brain's immunity and the urge to drink alcohol at night.

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‘Blocking a specific part of the brain's immune system can substantially decrease the motivation to drink alcohol in the evening.’

"Alcohol is the world's most commonly consumed drug, and there is a greater need than ever to understand the biological mechanisms that drive our need to drink alcohol," says lead author Jon Jacobsen, PhD student at the University of Adelaide's Discipline of Pharmacology.

"Our body's circadian rhythms affect the 'reward' signals we receive in the brain from drug-related behavior, and the peak time for this reward typically occurs during the evening, or dark phase. We wanted to test what the role of the brain's immune system might have on that reward, and whether or not we could switch it off."

The researchers focused their attention on the immune receptor Toll-like receptor 4 (TLR4). They administered the drug (+)-Naltrexone, which is known to block TLR4, to mice.

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"Our studies showed a significant reduction in alcohol drinking behavior by mice that had been given (+)-Naltrexone, specifically at night time when the reward for drug-related behavior is usually at its greatest," Mr Jacobsen says.

"We concluded that blocking a specific part of the brain's immune system did in fact substantially decrease the motivation of mice to drink alcohol in the evening."

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Senior author Professor Mark Hutchinson, Director of the ARC Centre of Excellence for Nanoscale BioPhotonics at the University of Adelaide and leader of the Neuroimmunopharmacology lab in which this work was conducted, says these findings point to the need for further research to understand the implications for drinking behavior in humans.

"Our study is part of an emerging field which highlights the importance of the brain's immune system in the desire to drink alcohol. Given the drinking culture that exists in many nations around the world, including Australia, with associated addiction to alcohol and related health and societal issues, we hope our findings will lead to further studies."

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Source-Eurekalert