The study led by Jun Wang at the Naresh K. Vashisht College of Medicine, Texas A&M, maps a biological route by which stress promotes habit‑like behaviours, including drinking. Published in eLife with support from the National Institute on Alcohol Abuse and Alcoholism, the research identifies specific brain regions, signalling molecules and cell types that link stress to the brain’s decision‑making system.
Researchers traced a direct pathway from classical stress centres — the central amygdala (CeA) and the bed nucleus of the stria terminalis (BNST) — to the dorsal striatum. Those stress centres send the peptide corticoptropin‑releasing factor (CRF) into the dorsal striatum, where CRF targets cholinergic interneurons (CINs). CINs release acetylcholine and promote behavioural flexibility, which helps with learning and adapting choices instead of falling into automatic habits.
The team showed that applying CRF increases CIN activity and acetylcholine release. Crucially, alcohol interferes with this circuit: during early withdrawal, alcohol weakened CRF’s ability to activate CINs, and alcohol by itself slowed CIN activity. These changes reduce the brain’s natural capacity to adapt to stress, which helps explain key features of addiction — stress‑triggered relapse, rigid compulsive behaviours, and vulnerability during withdrawal.
Jun Wang notes that identifying the precise pathway and the involved cells opens new therapeutic possibilities. Potential strategies include:
- strengthening CIN activity to restore flexibility,
- supporting CRF signalling during withdrawal,
- or protecting the stress‑response circuit from alcohol’s effects.
Difficult words
- peptide — short chain of amino acids
- signal — send information between cells or systemssignalling
- interneuron — small nerve cell connecting other neurons locallyinterneurons
- acetylcholine — chemical neurotransmitter that nerve cells release
- withdrawal — period after stopping a substance use
- relapse — return to harmful behaviour after recovery
- dorsal striatum — brain region involved in decision and habits
- corticoptropin‑releasing factor — peptide hormone that acts as stress signalcorticoptropin‑releasing factor (CRF)
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- How might protecting the stress-response circuit from alcohol’s effects help people in recovery? Give reasons or examples.
- Which of the proposed strategies (strengthening CINs, supporting CRF signalling, protecting the circuit) seems most promising and why?
- Besides drinking, how could reduced behavioural flexibility change everyday decisions or habits?
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