Future Alcohol Research Articles

The mediating role of impulsivity on suicidal behaviour among higher education students with depression and substance abuse disorders.

Alcohol and drug dependent individuals have consistently exhibited elevated impulsivity and some studies have indicated that impulsivity recorded in young adults predicts future alcohol abuse. Research also indicates that depressed individuals with higher impulsivity are more likely to report suicidal ideation even when they are less depressed, which may indicate that impulsivity could more strongly predict suicidality than severity of depressive symptoms. The aim of this study was to investigate the mediating role of impulsivity on suicidal behaviour and self-harm among students with depression, alcohol and substance abuse disorders. Participants were first-year undergraduate students (n=1829) across Ulster University (NI) and Letterkenny Institute of Technology (ROI), who were recruited as part of the World Mental Health International College Student Initiative. Participants completed an online survey utilising the WMH-Composite International Diagnostic Interview Screening Scales (CIDI-SC). Mediation analyses were conducted in three different stages. A high prevalence of depression and substance use disorders, suicidal ideation, plans, attempts and self-harm were observed. Impulsivity was found to partially mediate the association between depression and suicidal behaviours and substance use disorders and suicidal behaviours. Impulsivity was significantly associated with suicide ideation, attempts and self-harm, but not suicide plans. Males were more likely to be impulsive, and higher levels of depression and substance use disorders were related to higher impulsivity. The main findings of this study reinforce the role of impulsivity in mediating the relationship between depression and suicidality and substance use and suicidality. College wellbeing services may consider whether screening for impulsivity, rather than for example substance abuse, could be more beneficial and less prone to under-reporting, when assessing for suicide risk among vulnerable students.

Disentangling the temporal relationship between alcohol-related attitudes and heavy episodic drinking in adolescents within a randomized controlled trial.

Within many alcohol prevention interventions, changes in alcohol-related attitudes (ARA) are often proposed as precursors to changes in drinking behaviour. This study aimed to measure the longitudinal relationship between ARA and behaviour during the implementation of a large-scale prevention trial. This study was a two-arm school-based clustered randomized controlled trial. A total of 105 schools in Northern Ireland and Scotland participated in the Steps Towards Alcohol Misuse Prevention Programme (STAMPP) Trial. A sample of 12 738 pupils (50% female; mean age = 12.5years at baseline) self-completed questionnaires on four occasions (T1-T4). The final data sweep (T4) was 33 months post baseline. Individual assessments of ARA and heavy episodic drinking (HED) were made at each time-point. Additional covariates included location, school type, school socio-economic status and intervention arm. Estimated models examined the within-individual autoregressive and cross-lagged effects between ARA and HED across the four time-points (Bayes estimator). All autoregressive effects were statistically significant for both ARA and HED across all time-points. Past ARA predicted future ARA [e.g. ARAT1 → ARAT2 = 0.071, credibility interval (CI) = 0.043-0.099, P < 0.001, one-tailed]. Similarly, past HED predicated future HED (e.g. HEDT1 → HEDT2 = 0.303, CI = 0.222-0.382, P < 0.001, one-tailed). Autoregressive effects for HED were larger than those for ARA at all time-points. In the cross-lagged effects, past HED statistically significantly predicted more positive ARA in the future (e.g. HEDT2 → ARAT3 = 0.125, CI = 0.078-0.173, P < 0.001, one tailed) except for the initial T1-T2 path. In contrast, past ARA did not predict future HED across any time-points. Changes in alcohol-related attitudes were not a precursor to changes in heavy episodic drinking within the Steps Towards Alcohol Misuse Prevention Programme (STAMPP) Trial in Scotland and Northern Ireland. Rather, alcohol-related attitudes were more likely to reflect prior drinking status than predict future status. Heavy episodic drinking status appears to have a greater impact on future alcohol attitudes than attitudes do on future heavy episodic drinking.

Alcohol Modulates Frontal Cortex and BLA Network States Which Correlate with Future Voluntary Alcohol Consumption.

Although most adults in the United States will drink alcohol in their life, only ∼6% will go on to develop an alcohol use disorder (AUD). While a great deal of work has furthered our understanding of the cycle of addiction, it remains unclear why certain people transition to disordered drinking. Altered activity in regions implicated in AUDs, like the basolateral amygdala (BLA), has been suggested to play a role in the pathophysiology of AUDs, but how these networks contribute to alcohol misuse remains unclear. Here we investigated how the impact of alcohol on the BLA network relates to alcohol exposure. We first examined the effect of acute ethanol administration on the BLA and frontal cortical networks and the relationship with subsequent voluntary ethanol consumption using the Intermittent Access paradigm. In addition, we recorded network activity from the BLA and frontal cortex throughout the Drinking-in-the-Dark-Multiple Scheduled Access paradigm to assess the impact of voluntary alcohol consumption on network states during binge and abstinence periods. Finally, we investigated the impact of acute withdrawal from chronic alcohol exposure on BLA and frontal cortex network states using the Chronic Intermittent Ethanol (vapor) paradigm. We demonstrate that across paradigms, ethanol alters low gamma band (40-70 Hz) oscillations and remarkably correlates with the extent of future voluntary ethanol consumption in the IA paradigm. These data suggest that BLA network states play a role in the mechanisms influencing voluntary alcohol intake.

Effects of optimism and stage of change on alcohol use and problems among sexual minority men with HIV participating in a brief motivational interviewing intervention.

Disseminating effective alcohol interventions for sexual minority men (SMM) with HIV remains a crucial public health endeavor. Motivational interviewing (MI) interventions are an established approach to reducing alcohol use, yet more research is needed to determine predictors of MI treatment outcomes and underlying mechanisms related to sustained behavior change among SMM with HIV. This pre-registered secondary analysis tested whether action-related stage of change mediated effects of a MI intervention on future alcohol use and problems among SMM with HIV, and whether individual differences in trait optimism moderated these associations. SMM with HIV who engaged in frequent alcohol use (N = 180) were randomized to MI or assessment-only treatment as usual (TAU). Participants completed a semi-structured Timeline Follow-Back interview to measure past-month alcohol use as well as self-reports assessing stage of change, trait optimism, and alcohol problems at baseline and 3- and 12-months post-baseline. Structural equation models controlling for baseline alcohol use and stage of change indicated that 3-month action significantly mediated effects of MI on 12-month drinks per week. Likewise, the indirect effect of 3-month action was moderated by higher levels of trait optimism. When employment status, education level, and annual family/household income were included as covariates in the model, being employed significantly predicted 12-month alcohol use, and mediation and moderated mediation effects were no longer statistically significant. Stage of change did not mediate effects of MI on 12-month alcohol problems, and this indirect effect was not moderated by trait optimism. The present study provides further evidence supporting action-related stage of change as a mechanism linking MI to alcohol use reductions. Results demonstrated that SMM with HIV who were more optimistic tended to take more action towards reducing their alcohol use and suggest that MI-based interventions may benefit from integrating components aimed at augmenting patients' optimism. Yet, covarying for current economic status substantially impacted findings and underscores the need to critically consider how broader socioecological contexts can impact treatment outcomes.

Recommendations for the Design and Implementation of Alcohol Pharmacotherapy Trials: Perspectives of Women With HIV Participating in the WHAT-IF Study.

Naltrexone for alcohol reduction has been poorly studied in women with HIV (WWH), for whom heavy alcohol use is associated with negative HIV outcomes. This study offers recommendations for researchers conducting alcohol pharmacotherapy trials among PWH as suggested by WWH who participated in an alcohol pharmacotherapy trial in Florida. The WHAT-IF? Study enrolled WWH with a history of heavy alcohol use in Miami, Florida, into a clinical trial where participants were randomized to receive naltrexone or placebo to assess effectiveness among WWH. Twenty participants (mean age, 49 years; 85% Black/African American) completed interviews that included questions about barriers to participation and recommendations for future researchers and WWH. Interviews were analyzed using a reflexive thematic approach. We identified six recommendations: 1) increasing opportunities for study engagement, 2) fostering positive relationships to support change, 3) addressing medication concerns, 4) considering structural barriers to participation, 5) improving alcohol-related education, and 6) preventing fraudulent participation. Positive relationships included both study staff and external support. Medication concerns included cost, accessibility, and adherence. Structural barriers included transportation, substance use, and mental health conditions. Better education included information on the risks of alcohol use and encouraging women to quit. Overall, women reported having positive experiences in the WHAT-IF? trial, and many recommended that the study continue. Future alcohol pharmacotherapy studies could consider these recommendations when working with women from underserved communities, including WWH. Additionally, these recommendations could be applied to increase alcohol pharmacotherapy uptake and adherence in clinical practice.

Psychological outpatient follow-up after hospitalization for adolescent acute alcohol intoxication

Alcohol-related emergency department attendance in adolescents should be considered as a valuable opportunity to address and mitigate future alcohol consumption. Therefore, a paediatric department of a major district hospital in the Netherlands developed an outpatient preventive program targeting adolescents admitted for acute alcohol intoxication. The primary aim of this study is to evaluate how adolescent drinking patterns participating in the preventive program developed over time. This retrospective observational study involved 310 patients from the Reinier de Graaf Hospital, Delft, the Netherlands (years 2014–2022). The outpatient preventive program consists of three main components: an initial intervention, subsequent an extended counselling session and psychological interventions. The alcohol consumption was compared at three time points: before the admission for acute alcohol intoxication(T = 0), 4–6 weeks after hospital admission (T = 1) and 6–12 months after the hospital admission (T = 2). Moreover, sociodemographic variables, adolescent risk-taking behaviour and family and pedagogical factors were included in secondary analysis. Adolescents who experienced an alcohol intoxication exhibited more adolescent risk-taking behaviour (higher rates of lifetime smoking, substance use and sexual intercourse) compared to the Dutch average. Initially, these adolescents had significantly higher rates of alcohol consumption and drunkenness. Alcohol use decreased significantly in the month following intoxication, even below the Dutch average. Though 6–12 months later, their alcohol consumption increased but remained statistically lower and involved less binge drinking than the Dutch average. Conclusions: The findings of this study demonstrate that a preventive program following acute alcohol intoxication contributes to the reduction of adolescent alcohol use and associated risk-taking behaviours. What is Known:• Earlier studies showed that adolescents with problematic alcohol use reported reduced alcohol consumption and fewer alcohol-related problems after participating in a motivational interviewing intervention compared to standard care.• During the follow-up assessment of adolescents with acute alcohol intoxication it is possible to signalize mental disorders and to determine whether the patient requires referral to specialized mental healthcare.What is New:• These findings suggest that the preventive program had a short-term impact in reducing alcohol consumption among adolescents with acute alcohol intoxication, as well as a long-term impact in reducing binge-drinking behaviours.• The program’s success in mitigating binge-drinking behaviours aligns with its goals of promoting safer drinking habits among adolescents.

Adolescent alcohol consumption predicted by differences in electrophysiological functional connectivity and neuroanatomy.

Alcohol consumption during adolescence has been associated with neuroanatomical abnormalities and the appearance of future disorders. However, the latest advances in this field point to the existence of risk profiles which may lead to some individuals into an early consumption. To date, some studies have established predictive models of consumption based on sociodemographic, behavioral, and anatomical-functional variables using MRI. However, the neuroimaging variables employed are usually restricted to local and hemodynamic phenomena. Given the potential of connectome approaches, and the high temporal dynamics of electrophysiology, we decided to explore the relationship between future alcohol consumption and electrophysiological connectivity measured by MEG in a cohort of 83 individuals aged 14 to 16. As a result, we found a positive correlation between alcohol consumption and the functional connectivity in frontal, parietal, and frontoparietal connections. Once this relationship was described, multivariate linear regression analyses were used to evaluate the predictive capacity of functional connectivity in conjunction with other neuroanatomical and behavioral variables described in the literature. Finally, the multivariate linear regression analysis determined the importance of anatomical and functional variables in the prediction of alcohol consumption but failed to find associations with impulsivity, sensation seeking, and executive function scales. In conclusion, the predictive traits obtained in these models were closely associated with changes occurring during adolescence, suggesting the existence of different paths in neurodevelopment that have the potential to influence adolescents' relationship with alcohol consumption.

Sex-dependent, lateralized engagement of anterior insular cortex inputs to the dorsolateral striatum in binge alcohol drinking

How does alcohol consumption alter synaptic transmission across time, and do these alcohol-induced neuroadaptations occur similarly in both male and female mice? Previously we identified that anterior insular cortex (AIC) projections to the dorsolateral striatum (DLS) are uniquely sensitive to alcohol-induced neuroadaptations in male, but not female mice, and play a role in governing binge alcohol consumption in male mice (Haggerty et al., 2022). Here, by using high-resolution behavior data paired with in-vivo fiber photometry, we show how similar levels of alcohol intake are achieved via different behavioral strategies across sexes, and how inter-drinking session thirst states predict future alcohol intakes in females, but not males. Furthermore, we show how presynaptic calcium activity recorded from AIC synaptic inputs in the DLS across 3 weeks of water consumption followed by 3 weeks of binge alcohol consumption changes across, fluid, time, sex, and brain circuit lateralization. By time-locking presynaptic calcium activity from AIC inputs to the DLS to peri-initiation of drinking events we also show that AIC inputs into the left DLS robustly encode binge alcohol intake behaviors relative to water consumption. These findings suggest a fluid-, sex-, and lateralization-dependent role for the engagement of AIC inputs into the DLS that encode binge alcohol consumption behaviors and further contextualize alcohol-induced neuroadaptations at AIC inputs to the DLS.

Sex-dependent, lateralized engagement of anterior insular cortex inputs to the dorsolateral striatum in binge alcohol drinking.

How does alcohol consumption alter synaptic transmission across time, and do these alcohol-induced neuroadaptations occur similarly in both male and female mice? Previously we identified that anterior insular cortex (AIC) projections to the dorsolateral striatum (DLS) are uniquely sensitive to alcohol-induced neuroadaptations in male, but not female mice, and play a role in governing binge alcohol consumption in male mice (Haggerty et al., 2022). Here, by using high-resolution behavior data paired with in-vivo fiber photometry, we show how similar levels of alcohol intake are achieved via different behavioral strategies across sexes, and how inter-drinking session thirst states predict future alcohol intakes in females, but not males. Furthermore, we show how presynaptic calcium activity recorded from AIC synaptic inputs in the DLS across 3 weeks of water consumption followed by 3 weeks of binge alcohol consumption changes across, fluid, time, sex, and brain circuit lateralization. By time-locking presynaptic calcium activity from AIC inputs to the DLS to peri-initiation of drinking events we also show that AIC inputs into the left DLS robustly encode binge alcohol intake behaviors relative to water consumption. These findings suggest a fluid-, sex-, and lateralization-dependent role for the engagement of AIC inputs into the DLS that encode binge alcohol consumption behaviors and further contextualize alcohol-induced neuroadaptations at AIC inputs to the DLS.

Crowdsourcing alcohol billboards in Kampala, Uganda: Examining alcohol advertisement violations

Despite high levels of alcohol use in Uganda, there is a scarcity of research on alcohol marketing, its placement and content. In this field study we evaluated the content of alcohol billboards across Kampala, Uganda using the Alcohol Marketing Assessment Rating Tool (AMART). Of the 27 unique alcohol advertisements evaluated, the nine-member review panel found that 23 contained at least one violation yielding a violation rate of 85%. Given the high number of violations, our recommendation is that future alcohol billboard advertisements within Kampala be reviewed and approved by a governing body for compliance with alcohol advertisement standards.

Personality, Social Factors, Brain Functioning, Familial Risk, and Trajectories of Alcohol Misuse in Adolescence

The development of an alcohol use disorder in adolescence is associated with increased risk of future alcohol dependence. The differential associations of risk factors with alcohol use over the course of 8 years are important for preventive measures. To determine the differential associations of risk-taking aspects of personality, social factors, brain functioning, and familial risk with hazardous alcohol use in adolescents over the course of 8 years. The IMAGEN multicenter longitudinal cohort study included adolescents recruited from European schools in Germany, the UK, France, and Ireland from January 2008 to January 2019. Eligible participants included those with available neuropsychological, self-report, imaging, and genetic data at baseline. Adolescents who were ineligible for magnetic resonance imaging or had serious medical conditions were excluded. Data analysis was conducted from July 2021 to September 2022. Personality testing, psychosocial factors, brain functioning, and familial risk of alcohol misuse. Hazardous alcohol use as measured with the Alcohol Use Disorders Identification Test scores, a main planned outcome of the IMAGEN study. Alcohol misuse trajectories at ages 14, 16, 19, and 22 years were modeled using latent growth curve models. A total of 2240 adolescents (1110 female [49.6%] and 1130 male [50.4%]) were included in the study. There was a significant negative association of psychosocial resources (β = -0.29; SE = 0.03; P < .001) with the general risk of alcohol misuse as well as a significant positive association of the risk-taking aspects of personality with the intercept (β = 0.19; SE = 0.04; P < .001). Furthermore, there were significant positive associations of the social domain (β = 0.13; SE = 0.02; P < .001) and the personality domain (β = 0.07; SE = 0.02; P < .001) with trajectories of alcohol misuse development over time (slope). Family history of substance misuse was negatively associated with general risk of alcohol misuse (β = -0.04; SE = 0.02; P = .045) and its development over time (β = -0.03; SE = 0.01; P = .01). Brain functioning showed no significant association with intercept or slope of alcohol misuse in the model. The findings of this cohort study suggest known risk factors of adolescent drinking may contribute differentially to future alcohol misuse. This approach may inform more individualized preventive interventions.

Coping style as a risk factor for future alcohol use disorder: A 16-year longitudinal study in a Canadian military sample

BackgroundCoping strategies used in response to stress have the potential to influence the development of mental health disorders, including alcohol use disorders. The current study investigated whether coping strategies placed an individual at greater likelihood for developing a future alcohol use disorder. MethodsThis study used data from the Canadian Armed Forces Members and Veterans Mental Health Follow-up Survey; a nationally representative 16-year follow-up survey, with initial data collected in the 2002 Canadian Community Health Survey – Canadian Forces Supplement. The total sample from the two datasets included 2941 individuals who were Regular Force members in 2002. Coping styles included problem-focused, avoidant, and self-medication. Adjusted logistic regression analyses examined relationships between coping style (in 2002) and alcohol use disorders (developed between 2002 and 2018). ResultsSelf-medication coping in 2002 was associated with any alcohol disorder since last interview (i.e., 2002–2018) (AOR 1.26; 95 % CI, 1.02–1.57) and during the past year (adjusted odds ratios [AOR 1.26; 95 % CI, 1.08–1.47]), as well as past-year binge drinking (AOR 1.19; 95 % CI, 1.09–1.29). Problem-focused coping was protective against past-year alcohol abuse (AOR 0.84; 95 % CI, 0.71–1.00) and any alcohol use disorder (AOR 0.87; 95 % CI 0.76–1.00). ConclusionCoping styles were strongly associated with future alcohol use disorders. Notably, results show the risk extended over a 16-year period. Findings suggest the use of self-medicating coping strategies places an individual at increased risk of developing alcohol use disorders, while problem-focused coping may decrease future risk of alcohol use disorders.

Sex differences in binge drinking-related higher morning cortisol levels and in prospective association with future alcohol intake.

Peripheral cortisol represents one biological measure of the hypothalamic-pituitary-adrenal (HPA) axis, a significant component of the stress system, which is altered by chronic alcohol consumption. However, whether heavy alcohol use affects the HPA axis differentially between the sexes and whether basal cortisol levels are a biomarker of prospective alcohol intake is unknown. We recruited light moderate (LM) and binge-heavy (BH) drinkers of alcohol (n = 118). Repeated fasting morning cortisol levels were studied over a 2-hour period to assess basal levels while participants underwent a neuroimaging scan. Significantly higher average cortisol levels in BH compared to LM groups across four timepoints were observed (P < .018). Overall sex differences were observed with women showing higher initial cortisol levels at the first timepoint with a blunted decrease over the morning relative to men (P<.003). Average morning cortisol differentially predicted prospective future 30-day daily reports of alcohol consumption by sex and group, such that LM males had a positive significant relationship and BH males had a negative non-significant relationship between cortisol and drinking. Findings indicate that morning plasma cortisol is upregulated in the BH vs. LM group. Although females had higher initial morning cortisol levels, BH males showed a dysregulated negative relationship between stress and binge drinking in contrast to the LM group. Future work should further investigate the role of cortisol and other stress hormones as biomarkers of problematic drinking behaviors in men and women.

Sex-dependent, lateralized engagement of anterior insular cortex inputs to the dorsolateral striatum in binge alcohol drinking.

How does alcohol consumption alter synaptic transmission across time, and do these alcohol-induced neuroadaptations occur similarly in both male and female mice? Previous work shows that anterior insular cortex (AIC) projections to the dorsolateral striatum (DLS) are uniquely sensitive to alcohol-induced neuroadaptations in male, but not female mice, and play a role in governing binge alcohol consumption in male mice. Here, by using high-resolution behavior data paired with in-vivo fiber photometry, we show how similar levels of alcohol intake are achieved via different behavioral strategies across sex, and how inter-drinking session thirst states predict future alcohol intakes in females, but not males. Further, we show how presynaptic calcium activity recorded from AIC synaptic inputs in the DLS across 3 weeks of water consumption followed by 3 weeks of binge alcohol consumption change across, fluid, time, sex, and brain circuit lateralization. By time-locking presynaptic calcium activity from AIC inputs to the DLS to peri-initiation of drinking events we also show that AIC inputs into the left DLS robustly encode binge alcohol intake behaviors relative to water consumption and AIC inputs into the right DLS in males, but not females. These findings suggest a fluid-, sex- and lateralization-dependent role for the engagement of AIC inputs into the DLS that encode binge alcohol consumption behaviors and further contextualize alcohol-induced neuroadaptations at AIC inputs to the DLS.

S3 - Sex Differences in Adversity and Risk for Future Alcohol Use in Youth in the ABCD Study

S3 - Sex Differences in Adversity and Risk for Future Alcohol Use in Youth in the ABCD Study

Intimate partner violence is related to future alcohol use among a nationwide sample of LGBTQIA+ people: Results from The PRIDE Study

BackgroundLesbian, gay, bisexual, transgender, queer, intersex, aromantic and asexual (LGBTQIA+) communities in the United States experience higher rates of alcohol use than the general population. While experiencing intimate partner violence (IPV) is thought to lead to increased alcohol use in LGBTQIA+ people, little research has investigated the temporal relationship between IPV and alcohol use in this population. MethodsData from two annual questionnaires of The Population Research in Identity and Disparities for Equality Study (The PRIDE Study) longitudinal cohort (n=3,783) were included. Overall IPV and three sub-types (physical, sexual, and emotional) - measured in 2021 using the extended Hurt, Insult, Threaten, Scream (E-HITS) screening tool - was examined as a predictor of Alcohol Use Disorders Identification Test (AUDIT) score in 2022 using multivariable linear regression to assess linear and quadratic associations. Models were adjusted for sociodemographic characteristics and history of alcohol use. ResultsOne-quarter (24.7%) of respondents reported experiencing past-year IPV in 2021. The mean AUDIT score in 2022 was 3.52 (SD = 4.13). In adjusted models, both linear (B: 0.26, 95% CI: 0.14, 0.38) and quadratic (B: -0.03, 95% CI: -0.04, -0.01) terms for overall IPV were significantly associated with next-year AUDIT score. These patterns were mirrored in each IPV sub-type, were not attenuated when accounting for relationship characteristics, and were heterogeneous across gender identity groups. ConclusionsThese results provide evidence of a temporal relationship between IPV and alcohol use in LGBTQIA+ communities, suggesting that efforts to prevent and mitigate IPV may help reduce alcohol use disparities in this population.

Individual Behavioral and Neural Predictors of Future Alcohol Drinking Behavior

Individual Behavioral and Neural Predictors of Future Alcohol Drinking Behavior

Signal processing and machine learning with transdermal alcohol concentration to predict natural environment alcohol consumption.

Wrist-worn alcohol biosensors continuously and discreetly record transdermal alcohol concentration (TAC) and may allow alcohol researchers to monitor alcohol consumption in participants' natural environments. However, the field lacks established methods for signal processing and detecting alcohol events using these devices. We developed software that streamlines analysis of raw data (TAC, temperature, and motion) from a wrist-worn alcohol biosensor (BACtrack Skyn) through a signal processing and machine learning pipeline: biologically implausible skin surface temperature readings (< 28°C) were screened for potential device removal and TAC artifacts were corrected, features that describe TAC (e.g., rise duration) were calculated and used to train models (random forest and logistic regression) that predict self-reported alcohol consumption, and model performances were measured and summarized in autogenerated reports. The software was tested using 60 Skyn data sets recorded during 30 alcohol drinking episodes and 30 nonalcohol drinking episodes. Participants (N = 36; 13 with alcohol use disorder) wore the Skyn during one alcohol drinking episode and one nonalcohol drinking episode in their natural environment. In terms of distinguishing alcohol from nonalcohol drinking, correcting artifacts in the data resulted in 10% improvement in model accuracy relative to using raw data. Random forest and logistic regression models were both accurate, correctly predicting 97% (58/60; AUC-ROCs = 0.98, 0.96) of episodes. Area under TAC curve, rise duration of TAC curve, and peak TAC were the most important features for predictive accuracy. With promising model performance, this protocol will enhance the efficiency and reliability of TAC sensors for future alcohol monitoring research. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Do sleep and circadian characteristics predict alcohol use in adult drinkers?

While sleep and circadian rhythms are recognized contributors to the risk for alcohol use and related problems, few studies have examined whether objective sleep and circadian measures can predict future alcohol use in humans, and no such studies have been conducted in adults. This study examined whether any baseline sleep and/or circadian characteristics of otherwise healthy adults predicted their alcohol use over the subsequent 12 months. Participants (21-42 years) included 28 light and 50 heavy drinkers. At baseline, a comprehensive range of self-reported and objective sleep/circadian measures was assessed via questionnaires, wrist actigraphy, and measurement of dim light melatonin onset and circadian photoreceptor responsivity. Following this, the number of alcoholic drinks per week and binge drinking episodes per month were assessed quarterly over the subsequent 12 months. Anticipated effects of alcohol (stimulation, sedation, and rewarding aspects) were also assessed quarterly over the 12 months. Analyses included generalized linear mixed-effects models and causal mediation analysis. Across the range of measures, only self-reported insomnia symptoms and a longer total sleep time at baseline predicted more drinks per week and binges per month (ps <0.02). There was a trend for the anticipated alcohol effect of wanting more alcohol at the 6-month timepoint to mediate the relationship between insomnia symptoms at baseline and drinks per week at 12 months (p = 0.069). These results suggest that in otherwise healthy adults, insomnia symptoms, even if subclinical, are a significant predictor of future drinking, and appear to outweigh the influence of circadian factors on future drinking, at least in otherwise healthy adults. Insomnia symptoms may be a modifiable target for reducing the risk of alcohol misuse.

BK ZERO isoform HEK293 stably transfected cell lines differing 3'UTRs to assess miR-9 regulation.

Research has identified the large conductance voltage- and calcium-activated potassium channel (BK) as a key regulator of neuronal excitability genetically associated to behavioral alcohol tolerance. Sensitivity to ethanol at the molecular level is characterized by acute potentiation of channel activity. BK isoforms show variations in alcohol sensitivity and are differentially distributed on the plasma membrane surface in response to prolonged exposure. MicroRNA (MiRNA) targeting of alcohol-sensitive isoforms coupled with active internalization of BK channels in response to ethanol are believed to be key in establishing homeostatic adaptations that produce persistent changes within the plasma membrane of neurons. In fact, microRNA 9 (miR-9) upregulated expression is a key event in persistent alcohol tolerance mediating acute EtOH desensitization of BK channels. The exact nature of these interactions remains a current topic of discussion. To further study the effects of miR-9 on the expression and distribution of BK channel isoforms we designed an experimental model by transfecting human BK channel isoforms ZERO heterologous constructs in human embryonic kidney cells 293 (HEK293) cells respectively expressing 2.1 (miR-9 responsive), 2.2 (unresponsive) and control (no sequence) 3'untranslated region (3'UTR) miRNA recognition sites. We used imaging techniques to characterize the stably transfected monoclonal cell lines, and electrophysiology to validate channel activity. Finally, we used immunocytochemistry to validate isoform responsiveness to miR-9. Our findings suggest the cell lines were successfully transfected to express either the 2.1 or 2.2 version of ZERO. Patch clamp recordings confirm that these channels retain their functionality and immunohistochemistry shows differential responses to miR-9, making these cells viable for use in future alcohol dependence studies.