Study links brain chemistry to alcohol's appeal, offering clues to addiction risk
Researchers found that alcohol triggers specific changes in brain chemicals called endocannabinoids, which correlate with how much people enjoy drinking. The discovery could help identify who's vulnerable to alcohol abuse—potentially reshaping prevention strategies and opening new treatment targets for a global public health problem costing billions annually.
Originaltitel: Effects of acute alcohol administration on endocannabinoids and relation to subjective effects
<p>RationaleHarmful alcohol use remains a significant global public health challenge. Examining variability in the acute subjective effects of alcohol and related neurobiological mechanisms may advance the understanding of susceptibility to harmful alcohol use. Research suggests the endocannabinoid (eCB) system may play an important role in mediating the reinforcing effects of alcohol. This study examined the relationship between alcohol-induced changes in eCB concentrations and the subjective psychoactive effects of acute alcohol consumption.MethodHealthy social drinkers (n = 28, aged 20-35 years) participated in a within-subjects, single-blind, placebo-controlled laboratory alcohol challenge study. Alcohol (0.6 g/kg; with 20% adjustment for women) and placebo sessions were counterbalanced. Subjective alcohol effects were assessed from self-report questionnaires administered pre- and post-dosing, including the Biphasic Alcohol Effects Scale (BAES), Drug Effects Questionnaire (DEQ), and Profile of Mood States (POMS). The eCBs, N-arachidonoylethanolamine (anandamide; AEA) and 2-arachidonylglycerol (2-AG), were assessed from blood plasma taken throughout the dosing session.ResultsAcute alcohol was associated with an overall decrease in 2-AG concentrations compared to placebo. Further, we found that a drop in 2-AG concentrations was associated with less drug 'liking' and feelings of 'friendliness', whereas under placebo conditions, a rise in 2-AG was associated with a smaller decrease in feelings of 'stimulation' (e.g., feeling energized, talkative). Alcohol did not significantly affect AEA concentrations.ConclusionOur study provides the first evidence that eCBs may contribute to individual differences in sensitivity to alcohol's reward-related mechanisms by influencing subjective experience, offering insight into the potential role of eCBs in the processes underlying harmful alcohol use.</p>