Abstract
Background:
Adolescent electronic cigarette (e-cigarette) use remains high. Elucidating contributing factors may enhance prevention strategies. Neurobiologically, amygdala-insula resting-state functional connectivity (rsFC) has been linked with aspects of sleep, affect, and substance use (SU). As such, we hypothesized that amygdala’s rsFC with the insula would be associated with e-cigarette use via sleep problems and/or depression levels.
Methods:
An adolescent sample (N=146) completed a rs-fMRI scan at time 1 and self-reports at time 2 (~15 months later). Given consistent associations between mental health outcomes and the rsFC of the laterobasal amygdala (lbAMY) with the anterior insula, we utilized a seed region (lbAMY) to region of interest (ROI) analysis approach to characterize brain-behavior relationships. Two serial mediation models tested the interrelations between amygdala’s rsFC with distinct anterior insula subregions (i.e., ventral insula [vI], dorsal insula [dI]), sleep problems, depression levels, and days of e-cigarette use.
Results:
An indirect effect was observed when considering the lbAMY’s rsFC with the vI. Greater rsFC predicted more sleep problems, more sleep problems were linked with greater depressive symptoms, and greater depressive symptoms were associated with more e-cigarette use (indirect effect=0.08, CI [0.01,0.21]). Indicative of a neurobiological dissociation, a similar indirect effect linking these variables was not observed when considering the lbAMY’s rsFC with the dI (indirect effect=0.03, CI [−0.001,0.10]).
Conclusions:
These outcomes highlight functional interactions between the amygdala and insula as a neurobiological contributor to sleep problems, depressive symptoms, and ultimately SU thereby suggesting potential intervention points to reduce teen e-cigarette use.
Keywords: e-cigarettes, adolescence, amygdala, insula, sleep problems, depression
1. INTRODUCTION
Adolescent e-cigarette use remains alarmingly high and continues to be a public health concern (U.S. Food and Drug Administration, 2018). While use rates declined by ~9% from 2020-levels, 22% of adolescents reported past-year e-cigarette use in 2021 (Johnston et al., 2022). These rates are concerning given that vaping is linked with potential impacts to the cardiovascular (Moheimani et al., 2017) and respiratory systems (Hamberger & Halpern-Felsher, 2020; Shin et al., 2019) as well as an increased risk of combustible cigarette use. Specifically, ~30% of adolescent e-cigarette users may transition to combustible cigarettes, compared to only 8% of e-cigarette non-users (Leventhal et al., 2015). Additionally, nicotine, found in most e-cigarettes, is addictive (England et al., 2021) and can impact the brain (Shin et al., 2019; Sutherland et al., 2016). Characterizing factors linked with adolescent e-cigarette use is critical to mitigate negative health outcomes.
Multiple reasons exist for the popularity of e-cigarettes among teens. Some adolescents may start using given the false belief that e-cigarettes are a safer tobacco alternative and are more socially acceptable (McKeganey et al., 2017; Romijnders et al., 2018), or to cope with negative affect (Cristello et al., 2020; Kong et al., 2019). Risk factors associated with adolescent e-cigarette use include being male, having a friend/family member who uses, being Hispanic/Latino(a), and specific temperament profiles (Carey et al., 2019; Hartmann et al., 2021; Jane Ling et al., 2022). However, enhanced understanding of factors associated with use remains necessary. This may facilitate reductions in use by informing prevention and intervention programming. Other potential factors linked with nicotine use include sleep problems (Riehm et al., 2019), depressive symptoms (Leventhal et al., 2016), and emotion-related neurocircuitry (e.g., amygdala, insula; Sutherland et al., 2013).
Adequate sleep is critical for mental and physical well-being and is vital for development (Kwon et al., 2019; Storfer-Isser et al., 2013). Yet most teens (~70%) do not get the recommended amount of sleep (National Center for Chronic Disease Prevention and Health Promotion, 2021). Adequate sleep may reduce the risk of internalizing problems (i.e., depression), cognitive difficulties, and even SU (Brown et al., 2002). Indeed, prior studies have identified an association between sleep and SU across the lifespan. Sleep problems during childhood appear predictive of subsequent adolescent cigarette use (Warren et al., 2017; Wong et al., 2009), sleep-related complaints by teens has been linked with e-cigarette use (Riehm et al., 2019), and subjective sleep quality from adult users appears predictive of e-cigarette use disorder (Zvolensky et al., 2020).
Depression is another risk factor for SU and is predictive of e-cigarette use onset among adolescents (Green et al., 2018; Leventhal et al., 2016; Trucco et al., 2018). Indeed, adolescents reporting more depressive symptoms are at a greater risk of using nicotine (Lechner et al., 2017) potentially given the belief that nicotine use will enhance mood (Leventhal et al., 2016). Adolescents may use e-cigarettes as a means to cope with negative emotions, which is consistent with a self-medication hypothesis (Khantzian, 1985; Weinstein & Mermelstein, 2013).
Associations between sleep problems and depression among adolescents are also commonly observed. Sleep disturbance may be a precursor to the development of depression, whereas depression appear to be less predictive of the development of sleep disturbances (Lovato & Gradisar, 2014). Sleep deprivation is also predictive of depression one year later among adolescents even after controlling for baseline depression (Roberts & Duong, 2014). Sleep deprivation is also linked with enhanced negative emotional reactivity and subdued positive emotional reactivity (Vandekerckhove & Cluydts, 2010; Zohar et al., 2005). Thus, a reasonable perspective is that sleep problems may contribute to elevated depression.
The amygdala, a key node in emotion-related neurocircuitry, is implicated in aspects of SU (Koob & Volkow, 2010; Sutherland et al., 2013). The amygdala assesses sensory stimuli and emotional significance, and supports emotional memory formation (Höistad & Barbas, 2008). The amygdala has been divided into at least three functionally distinct subregions: laterobasal amygdala (lbAMY), associated with high-level sensory input; centromedial amygdala (cmAMY), linked with attentional and motor responses; and superficial amygdala (sfAMY), linked with olfactory-gustatory processes (Bzdok et al., 2013). Developmental neuroimaging studies have highlighted a role for the amygdala in adolescent SU. For example, adolescents at risk for SU disorders exhibit left amygdala hyper-reactivity to emotional faces, potentially indicative of impaired affect regulation abilities (Lindsay et al., 2014).
Sleep problems and depressive symptoms represent a plausible link in the association between amygdala functioning and adolescent SU. The amygdala’s functional interactions with other emotion-related regions such as the anterior insula, assessed via resting-state functional connectivity (rsFC), has been associated with inadequate sleep and insomnia, and internalizing symptoms (Huang et al., 2012; Klumpp et al., 2018; Paulus & Stein, 2010). Indeed, anatomical connections exist between the amygdala and insula (Augustine, 1996; Höistad & Barbas, 2008; Mufson et al., 1981). Notably, associations between the amygdala, sleep, and internalizing symptoms have been found (Klumpp et al., 2018). Importantly, prior work has demonstrated a significant interaction between the anterior insula and sleep disturbance on depression (Kim et al., 2022). As sleep problems may increase the development of future depression and depression seems to be less predictive of the development of sleep problems (Lovato & Gradisar, 2014; Roberts & Duong, 2014), we hypothesized that elevated amygdala-insula rsFC would be predictive of later sleep problems which, in turn, would relate to higher levels of depression and ultimately e-cigarette use.
The interrelations between amygdala-centric rsFC, sleep problems, depressive symptoms, and e-cigarette use have not been examined among adolescents. Using a serial mediation model framework, we characterized the degree to which lbAMY-anterior insula rsFC related to e-cigarette use via sleep problems and depressive symptoms. Our focus on lbAMY-anterior insula rsFC was rooted in prior work that has linked the functioning of these regions with sleep and mental health outcomes (Baur et al., 2013; Huang et al., 2012; Kim et al., 2022). Moreover, as the insula integrates major functional systems, such as those related to emotions, sensorimotor, and olfaction-gustation and is composed of functionally distinct subregions (Kurth et al., 2010), we examined potential nuances across anterior insula subregions. Namely, we separately considered ventral (vI) and dorsal (dI) insula subregions as these areas have been differentiated (Kurth et al., 2010). Examining multiple mediators at the same time may help elucidate intervention and prevention avenues by targeting adolescents at higher risk for e-cigarette use.
2. METHODS
2.1. Participants
Data from a subsample of adolescents (n = 146; 48% female, 88% White, 84% Hispanic/Latino(a), Mage = 14.9 at initial visit) who had completed an MRI scan within a larger project (N = 264) were assessed. The subsample did not differ from the full study sample regarding demographics, sleep problems, depressive symptoms, or e-cigarette use (p’s range=0.16–0.96). Freshmen and sophomores enrolled in local schools, as well as caregivers, completed wave-1 (W1; adolescent’s age range=13–17) and wave-2 (W2; ~15 months later; adolescent’s age range=15–18) of the larger study examining factors impacting e-cigarette use (Cristello et al., 2020; Hartmann et al., 2021; Trucco et al., 2021). W1 data were collected from March 2018 through December 2019, and W2 data were collected from June 2019 to March 2021. Exclusionary criteria included: a learning disorder, intellectual/physical disability, neurological diseases, severe mental illness, and English non-fluency. MRI scanning exclusion criteria included: left-handedness, non-removable metal, claustrophobia, and for females, pregnancy.
2.2. Procedures
Recruitment was conducted at public schools. Families interested in participating completed an eligibility screen. Those meeting criteria were scheduled for W1 data collection. W1 involved two in-person visits. During visit W1a, participants completed set of questionnaires. Adolescent questionnaires took ~90min to complete while caregiver questionnaires took ~45min. Following providing consent/assent, adolescents and caregivers were escorted to separate rooms to ensure confidentiality. During visit W1b (scheduled within a month of W1a), adolescents completed additional questionnaires (~15min) and an MRI session (~90min). The MRI session consisted of two tasks (see Supplemental Information for task details) and a functional resting-state fMRI (rs-fMRI) scan completed between the two tasks. W2 assessments were conducted ~15 months after W1a via similar procedures. Due to COVID-19 restrictions, some appointments were remotely. Questionnaires were administered on an iPad during in-person visits and on personal electronic devices during remote visits using REDCap (Research Electronic Data Capture; Harris et al., 2019; Harris et al., 2009). Participants were compensated and the University’s Institutional Review Board approved study procedures.
2.3. Measures
Youth Self Report (YSR).
To quantify sleep problems and depressive symptoms, raw scores from the YSR of the Achenbach System of Empirical Behavioral Assessment (ASEBA; Achenbach & Rescorla, 2001) were used. Items were rated on a 3-point Likert scale (0=not true, 2=very true/often true). Sleep problems were derived by summing five items (“I have nightmares”, “I feel overtired without good reason”, “I sleep less than most kids”, “I sleep more than most kids during the day and/or night”, “I have trouble sleeping”; Cronbach’s α=0.47). While neither the YSR nor the parent-report version of the YSR (i.e., ASEBA CBCL) include a validated sleep scale, these sleep-related items have been associated with other validated sleep measures (Becker et al., 2015), and they have been used to assess sleep problems among adolescents and children (Poznanski et al., 2018; Thompson et al., 2020). While acknowledging that the internal consistency for this scale is low, the Cronbach’s α estimate is consistent with prior work employing a similar strategy quantifying sleep problems among adolescents and children (Becker et al., 2015; Fava et al., 2022; Narmandakh et al., 2020). The YSR’s withdrawn/depressed subscale, comprised of eight items (e.g., “I am unhappy, sad or depressed”; Cronbach’s α=0.77), quantified depressive symptoms. This subscale has shown consistency with other validated measures of depression (Ivarsson et al., 2002; Youngstrom et al., 2021). The YSR was administered to participants at both W1 and W2 allowing for sleep problems and depressive symptoms at W1 to serve as covariates.
Adolescent e-cigarette use.
Use was assessed at W2 using an item adapted from the Population Assessment of Tobacco and Health Survey (PATH) study, which assesses adolescent SU at the national level (Hyland et al., 2016). Utilizing a continuous variable to account for variation in e-cigarette use behavior, participants answered, “Since your last visit, on how many days did you use an Electronic Nicotine Delivery System (ENDS) product?” Participants were able to enter a value spanning 0 days to 455 days of use. Of note, national studies such as Monitoring the Future (Johnston et al., 2022) also adopt single items to assess SU. Prior lifetime e-cigarette use was also assessed at W1 via a dichotomous question (“Have you ever used an ENDS product, such as NJOY, Blu, Smoking Everywhere, a vape pen, or a vape mod, even one or two times?”), and served as a covariate to get a proxy of e-cigarette use initiation based on prior work recommending that baseline measures of outcomes be included in data analytic models to reduce biased estimates (Landau et al., 2018).
2.4. Neuroimaging Data Acquisition and Preprocessing
Whole-brain blood oxygenation level-dependent (BOLD) echo-planar imaging (EPI) data were acquired on a 3T Siemens MAGNETOM Prisma scanner equipped with a 32-channel head coil. Participants completed a 10min rs-fMRI run with eyes closed. During rest, 60 slices (2.4mm thick) were obtained in the transverse plane (750 volumes, repetition time=800ms, echo time=30ms, flip angle=52°, voxel size=2.4mm3; field of view=216mm, 90×90 matrix, multiband acceleration=6). Structural T1-weighted images (T1w) were acquired using a magnetization prepared rapid gradient-echo sequence (MPRAGE: TR=2,500ms; TE=2.9ms; flip angle=8°; voxel size=1mm3).
Neuroimaging data were preprocessed using fMRIPrep 20.2.1 (Esteban, Blair, et al., 2018; Esteban, Markiewicz, et al., 2018; RRID: SCR_016216), and analyzed with AFNI (Cox & Hyde, 1997). For detailed MRI data preprocessing, see Supplemental Information.
2.5. Functional data analysis
Separate first-level rsFC analyses were conducted for three seed regions in the left amygdala. lbAMY, cmAMY, and sfAMY were defined using a parcellation based on a meta-analytic connectivity modeling framework (Bzdok et al., 2013). These seeds were resampled to each participants’ rs-fMRI data space. Timeseries from voxels within each seed were averaged and extracted from each participant’s unsmoothed data. Data were subsequently smoothed to 4mm FWHM (3dBlurToFWHM). The three seeds’ average time-series were entered into a whole-brain multiple regression analysis (3dDeconvole & 3dREMLfit, AFNI). Connectivity maps representing each amygdala subregion’s rsFC with respect to (i.e., controlling for) the rsFC of the other two amygdala subregions were generated.
Whole-brain one-sample t-tests (two-tailed, 3dMEMA) were used to create overall rsFC maps for each amygdala seed (e.g., Figure 1a). Pairwise dependent-samples t-tests (two-tailed, 3dTtest++) were conducted to compare amygdala subregion rsFC (e.g., lbAMY vs. cmAMY rsFC maps; Figure 1b). Following preliminary group-level rsFC analyses for each amygdala subregion, the functional connections between the lbAMY seed and both the vI and dI subregions of interest were quantified given our a priori focus. The vI and dI ROIs were defined using Chang and colleagues (2013) parcellation based on neuroimaging metanalytic work assessing a variety of tasks in the literature (Chang et al., 2013). The average z-values (i.e., rsFC values) from the vI and dI ROIs (Figure 2a) were extracted from the left lbAMY rsFC map using AFNI’s 3dROIstats for graphical assessment and follow-up analyses.
Figure 1. Differential amygdala subregion resting-state functional connectivity (rsFC).

(a) Whole brain rsFC of laterobasal (1; pFWE-corrected < 0.05, pvoxel-wise=1.0–9), centromedial (2; pFWE-corrected < 0.05, pvoxel-wise=1.0–4) and superficial (3; pFWE-corrected < 0.05, pvoxel-wise=1.−11) amygdala seed regions. (b) Pairwise comparisons between amygdala subregions highlighted significant rsFC differences between (1) laterobasal versus centromedial, (2) centromedial versus superficial, and (3) superficial versus laterobasal amygdala subregions (pFWE-corrected <0.05, pvoxel-wise=1.0–5).
Figure 2. Serial mediation model linking amygdala-insula rsFC, sleep problems, depressive symptoms, and e-cigarette use.

(a) We utilized a seed region to region of interest (ROI) analysis strategy to a priori focus assessment on the left laterobasal amygdala’s [blue] rsFC with the anterior insula (both dorsal [dI, pink] and ventral [vI, yellow] areas). (b) A significant indirect effect from the serial mediation model indicated that higher amygdala-insula rsFC was linked with more e-cigarette use via sleep problems and depressive symptoms when considering the ventral (top), but not the dorsal anterior insula subregions, *p < 0.05, **p < 0.01, ***p < 0.001; W1=Wave 1; W2=Wave 2.
2.6. Data Analytic Plan
Serial mediation analyses with two mediators were conducted using the PROCESS macro version 3.3 (Hayes, 2019) for SASv9.4 (SAS Institute, 2002–2012). Two separate serial mediation models considered whether a participant’s self-reported sleep problems at W2 (M1) and depressive symptoms (M2) mediated the relationship between lbAMY-anterior insula rsFC subregions (vI, dI) at W1 (X) and e-cigarette use at W2 (Y). Apart from estimating indirect effects with bootstrapped confidence intervals (CIs) for serial mediation, the PROCESS macro also provides indirect effects with CIs for the simple mediation pathways (Hayes, 2018). Study variables were normally distributed (skewness range=0.29–0.79, kurtosis range=−1.72–1.47) apart from e-cigarette use at W2 (skewness=5.08, kurtosis=27.36). Given the non-normality of this variable, a logarithm transformation was applied (Kline, 2016). Descriptive statistics and zero-order correlations were calculated for all variables. The following covariates were included: W1 sleep problems, W1 depressive symptoms, W1 lifetime e-cigarette use, biological sex, age, ethnicity, and mean framewise displacement (FD) values to account for in-scanner head motion (Burgess et al., 2016; Power et al., 2012); see Supplemental Information, Figure S1 for covariation paths).
3. RESULTS
Table 1 displays means, standard deviations, and correlations for study variables. We observed that e-cigarette use (since W1) was positively correlated with lifetime e-cigarette use, as well as self-reported sleep problems and depressive symptoms assessed at W2. Depressive symptoms at W2 positively correlated with sleep problems at both W1 and W2, as well as depressive symptoms at W1. Notably, sleep problems at W2 positively correlated with left lbAMY-vI and lbAMY-dI rsFC, as well as sleep problems assessed at W1.
Table 1.
Means, Standard Deviations, and Correlations for Study Variables.
| M | SD | Correlations | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| ||||||||||||||
| Study Variables | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | ||
|
| ||||||||||||||
| 1. Age (W1a) | 14.90 | 0.68 | – | |||||||||||
| 2. Sexa (W1a) | 0.49 | 0.50 | 0.02 | – | ||||||||||
| 3. Ethnicityb | 0.84 | 0.36 | 0.08 | −0.12 * | – | |||||||||
| 4. Lifetime E-Cig. Usec (W1a) | 0.33 | 0.47 | 0.07 | 0.03 | 0.10 | – | ||||||||
| 5. Sleep Problems (W1a) | 0.56 | 0.38 | −0.01 | −0.08 | 0.08 | 0.13 * | – | |||||||
| 6. Depressive Symptoms (W1a) | 4.26 | 2.86 | −0.13 * | −0.08 | 0.03 | 0.14 * | 0.52 *** | – | ||||||
| 7. FD Mean (W1b) | 0.16 | 0.07 | −0.25 *** | 0.09 | −0.22 ** | −0.12 | 0.09 | 0.05 | – | |||||
| 8. lbAMY-vI rsFC (W1b) | 0.28 | 0.38 | 0.10 | 0.01 | −0.02 | −0.02 | 0.01 | 0.10 | −0.06 | – | ||||
| 9. lbAMY-dI rsFC (W1b) | 0.34 | 0.52 | 0.13 | 0.04 | 0.13 | 0.05 | 0.09 | 0.16 * | 0.08 | 0.59 *** | – | |||
| 10. E- Cig. Use Since W1a (W2) | 10.93 | 43.43 | 0.07 | −0.01 | 0.04 | 0.29 ** | 0.10 | 0.05 | 0.07 | 0.13 | 0.09 | – | ||
| 11. Sleep Problems (W2) | 0.50 | 0.37 | −0.01 | −0.11 | 0.01 | −0.01 | 0.60 *** | 0.45 *** | 0.06 | 0.23 ** | 0.17 * | 0.17 * | – | |
| 12. Depressive Symptoms(W2) | 4.11 | 2.99 | −0.04 | −0.10 | 0.01 | 0.08 | 0.38 *** | 0.59 *** | 0.07 | 0.12 | 0.12 | 0.18 * | 0.59 *** | – |
Note.
p < 0.05
p < 0.01
p < 0.001
W1a=Wave 1, Visit 1; W1b=Wave 1, Visit 2; W2=Wave 2
Female=0 (51%, n = 134), Male=1 (49%, n = 130)
non-Hispanic/Latino(a)=0 (16%, n = 41), Hispanic/Latino(a)=1 (84%, n = 223)
Non-User=0 (67%, n = 176), User=1 (33%, n = 88)
sample information based on larger on-going project’s W1a sample size (N = 264).
3.1. Amygdala subregion rsFC
Assessment of whole-brain rsFC maps from the three amygdala subregions revealed patterns largely consistent with prior reports (Figure 1a). The lbAMY demonstrated prominent rsFC with medial prefrontal, temporal, and parietal regions; the cmAMY with the striatum, thalamus, insula, dorsal ACC, and cerebellum; and the sfAMY with the posterior insula and hippocampus (Roy et al., 2009). Assessment of pairwise comparisons between amygdala subregion rsFC maps further highlighted dissociations in connectivity patterns (Figure 1b). For example, the lbAMY (blue) demonstrated significantly greater rsFC with temporal regions relative to the other subregions; the cmAMY (red) demonstrated greater connectivity with limbic and cerebellar regions; and the sfAMY (green) showed greater rsFC with the hippocampus
3.2. Serial Mediation Models for amygdala-insula rsFC impact on e-cigarette use
A significant indirect effect was observed when considering the influence of lbAMY-vI rsFC on e-cigarette use via sleep problems and depressive symptoms (Figure 2b[top], Table 2). First, lbAMY-vI rsFC at W1 was a significant predictor of sleep problems at W2 (effect=0.22, p=0.001), such that greater rsFC indicated more sleep problems. Second, sleep problems (but not rsFC) were significantly related to depressive symptoms (effect=3.32, p<0.001), such that more sleep problems indicated greater depressive symptoms. Lastly, depressive symptoms (but not rsFC nor sleep problems) were significantly related to e-cigarette use (effect=0.11, p=0.002), such that more depressive symptoms indicated more days of e-cigarette use. Taken together, these outcomes evidenced a significant indirect effect of lbAMY-vI rsFC (X) on e-cigarette use (Y) through sleep problems (M1) and depressive symptoms (M2; indirect effect=0.08, CI [0.01,0.21]).
Table 2.
Regression Coefficients, Standard Errors, and Summary Information of the Laterobasal Amygdala-Ventral Insula (lbAMY-vI) Serial Mediation Model Predicting E-Cigarette Use.
| Sleep Problems W2 (M1) | Depression W2 (M2) | E-Cigarette Use W2 (Y) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|
||||||||||||
| Coefficient | (95% CI) | SE | t Value | Coefficient | (95% CI) | SE | t Value | Coefficient | (95% CI) | SE | t Value | |
|
| ||||||||||||
| Intercept | 0.11 | (−1.05, 1.27) | 0.59 | 0.19 | 1.65 | (−7.23, 10.52) | 4.49 | 0.37 | −2.84 | (−7.59, 1.91) | 2.40 | −1.18 |
| Age | −0.002 | (−0.08, 0.07) | 0.04 | −0.05 | −0.08 | (−0.65, 0.49) | 0.29 | −0.29 | 0.17 | (−0.14, 0.47) | 0.15 | 1.09 |
| Sexa | −0.01 | (−0.11, 0.08) | 0.05 | −0.30 | −0.08 | (−0.83, 0.67) | 0.38 | −0.22 | 0.11 | (−0.29, 0.51) | 0.20 | 0.53 |
| Ethnicityb | −0.08 | (−0.22, 0.06) | 0.07 | −1.12 | 0.19 | (−0.89, 1.27) | 0.55 | 0.35 | −0.26 | (−0.84, 0.31) | 0.29 | −0.90 |
| Lifetime E-Cig. Use (W1a) | −0.01 | (−0.11, 0.10) | 0.05 | −0.15 | 0.20 | (−0.61, 1.01) | 0.41 | 0.50 | 0.80 *** | (0.37, 1.24) | 0.22 | 3.66 |
| Sleep Problems (W1a) | 0.46 *** | (0.30, 0.62) | 0.08 | 5.61 | −0.62 | (−1.99, 0.76) | 0.70 | −0.88 | 0.25 | (−0.49, 0.98) | 0.37 | 0.66 |
| Depressive Symptoms(W1a) | 0.03 * | (0.01, 0.05) | 0.01 | 2.46 | 0.48 *** | (0.32, 0.64) | 0.08 | 5.98 | −0.04 | (−0.14, 0.05) | 0.05 | −0.89 |
| FD Mean (W1b) | 0.37 | (−0.35, 1.08) | 0.36 | 1.01 | 0.75 | (−4.74, 6.25) | 2.78 | 0.27 | 1.91 | (−1.03, 4.86) | 1.49 | 1.29 |
| lbAMY-vI rsFC (W1b) | 0.22 *** | (0.10, 0.35) | 0.06 | 3.48 | 0.02 | (−0.99, 1.03) | 0.51 | 0.04 | 0.24 | (−0.30, 0.78) | 0.27 | 0.88 |
| Sleep Problems (W2) | - | - | - | - | 3.32 *** | (2.03, 4.61) | 0.65 | 5.09 | −0.10 | (−0.85, 0.65) | 0.38 | −0.27 |
| Depressive Symptoms(W2) | - | - | - | - | - | - | - | - | 0.11 * | (0.02, 0.20) | 0.05 | 2.44 |
| R2 = 0.39 | R2 = 0.47 | R2 = 0.18 | ||||||||||
| F (8, 137) = 10.86, p < 0.001 | F (9, 136) = 13.53, p < 0.001 | F (10, 135) = 3.00, p = 0.002 | ||||||||||
Note.
p < 0.05
p < 0.01
p < 0.001.
lbAMY-vI=resting-state functional connectivity between the laterobasal amygdala and ventral insula; W1a=Wave 1-Visit 1; W1b=Wave 1-Visit 2; W2=Wave 2
Female=0, Male=1
non-Hispanic/Latino(a)=0, Hispanic/Latino(a)=1
FD Mean=mean framewise displacement.
In contrast, we did not observe a significant indirect effect when considering lbAMY-dI rsFC (Figure 2b[bottom], Supplemental Information Table S1). Specifically, lbAMY-dI rsFC at W1 was not a significant predictor of sleep problems at W2 (effect=0.09, p=0.06). As such, this model did not detect a significant indirect effect of lbAMY-dI on e-cigarette use via sleep problems and depression (indirect effect=0.03, CI [−0.001,0.10]).
3.3. Sensitivity Analyses
Given the YSR-derived sleep problems score possessed low internal consistency (Cronbach’s α=0.47), we conducted ancillary analyses utilizing an alternative measure (i.e., Adolescent Sleep Hygiene Scale; (Storfer-Isser et al., 2013) which was collected only at W2. Specifically, the ASHS’s cognitive/emotional subscale was used as prior work has demonstrated that less pre-sleep cognitive/emotional arousal among adolescents is linked with earlier bedtime routines, decreased sleep latency, and longer sleep (Bartel et al., 2016). We arrived at similar outcomes and interpretations as those described above for the YSR-derived variable (Supplemental Information Figure S2, Tables S2 and S3). Given the YSR was administered at both W1 and W2, we elected to present those outcomes in the main text since W1-values were used as a covariate.
4. DISCUSSION
Adolescent e-cigarette use remains problematic (Johnston et al., 2022) and elucidating associated factors may help reduce use rates. Individual differences in emotion-related neurocircuitry (e.g., amygdala, insula) may confer risk for adolescent SU (Chaplin et al., 2019; Hardee et al., 2017; Lindsay et al., 2014). This study bridged multiple lines of research and examined a pathway through which amygdala-insula rsFC may contribute to e-cigarette use by considering the potential mediating roles of sleep problems and depressive symptoms. The main objective of the current study was to examine a continuous measure of early stages of e-cigarette use by assessing the role of amygdala-insula rsFC, sleep problems, and depression on e-cigarette use controlling for lifetime e-cigarette use. Namely, controlling for the baseline measure of a continuous clinical outcome variable can reduce biased estimates (Landau et al., 2018). Hence, the inclusion of lifetime e-cigarette use at wave 1 as a proxy of initiation.
We first observed that amygdala subregion rsFC patterns were largely consistent with prior reports (Roy et al., 2009). Additionally, we observed that greater lbAMY-vI rsFC predicted more sleep problems, more sleep problems were associated with greater depressive symptoms, and that greater depressive symptoms were associated with more e-cigarette use. Our outcomes indicated that left lbAMY-vI rsFC was not directly associated with e-cigarette use, rather other factors mediated this association. Prior work has suggested that the link between amygdala-insula functioning and SU may operate via negative affect or internalizing pathways (Chaplin et al., 2019; Hardee et al., 2017). Indeed, lbAMY-anterior insula rsFC is linked to internalizing symptoms (Baur et al., 2013; Paulus & Stein, 2010). Yet, our findings showed that lbAMY-anterior insula rsFC was not directly associated to subsequent depression; rather, sleep problems linked this relationship. Importantly, an interaction between the anterior insula and sleep disturbance on depressive symptoms has been previously found (Kim et al., 2022). Moreover, it has been suggested that sleep modulates amygdala rsFC in depression (Klumpp et al., 2018). Plausibly, the link between amygdala-insula and depression is explained by other factors like sleep problems. Our findings expand on previous work by demonstrating that lbAMY-vI predicted sleep problems and that in turn was associated with depressive symptoms.
Noteworthy, there was a lack of support for simple mediation via sleep problems or depressive symptoms in the association between amygdala-insula rsFC and e-cigarette use. However, as expected, there was support for serial mediation whereby sleep problems were linked to depressive symptoms, which in turn were associated with more days of e-cigarette use, but only for the left lbAMY-vI model. A non-significant association was observed when considering the influence of lbAMY-dI on sleep problems, perhaps suggesting the relative importance of the anterior vI. The anterior insula has been linked with inadequate sleep and insomnia (Huang et al., 2012; Klumpp et al., 2018), and elevated anterior insula activity is linked with higher depression among individuals reporting insomnia and sleep disturbances (Chen et al., 2014; Kim et al., 2022). However, most work has focused on the anterior insula as a whole and not the potential nuances across anterior-ventral and anterior-dorsal insula subregions. Importantly, the anterior-vI has been associated with social-emotional tasks and affective processes whereas the anterior-dI has been linked to cognitive task performance (Kurth et al., 2010).
Our findings suggest that altered left lbAMY-vI rsFC may contribute to sleep problems, such sleep problems may increase depressive symptoms, and higher levels of depressive symptoms contribute to more days of e-cigarette use. These observations are consistent with prior work linking amygdala-insula functioning with sleep problems (Chen et al., 2014; Huang et al., 2012; Klumpp et al., 2018), work linking sleep problems with depression among adolescents (Lovato & Gradisar, 2014), and work linking hyperactivity of the left anterior insula to negatively valenced emotional stimuli and adolescent SU (Chaplin et al., 2019). We suggest that adolescents with elevated left lbAMY-vI rsFC, sleep problems, and/or high depressive symptoms may use e-cigarettes as a means to cope with their symptomatology.
4.1. Limitations
While clear associations were observed between left lbAMY-anterior insula rsFC (W1) with sleep problems, depressive symptoms, and e-cigarette use, bidirectional relationships may exist among W2 variables. Namely, bidirectional associations have been observed among sleep, depression, and e-cigarette use (Lechner et al., 2017; Lovato & Gradisar, 2014; Merianos et al., 2021). Including at least one additional timepoint to account for temporal precedence is critical for future work to further elucidate causality (e.g., replicate prior work on sleep problems as a precursor of future depression; (Lovato & Gradisar, 2014). Second, this sample consisted of primarily Hispanic/Latino(a) adolescents, who appear to be at increased risk for clinical syndromes (Anderson & Mayes, 2010), and for e-cigarette initiation at an early age compared to other ethnicities (Lanza et al., 2017). As such, our sample may have reported higher depression and e-cigarette use and the degree to which results may generalize to students from other locations remains unclear. Third, this study used self-report measures and individuals may demonstrate biased perceptions of their sleep, emotional states, and SU. Factors related to cognitive (e.g., understanding of the question) or situational factors (e.g., stigma) may have impacted adolescent’s self-reports of e-cigarette use (Brener et al., 2003). Fourth, specific stages of SU should be examined as our findings could be interpreted as initiation, maintenance, and/or escalation of use. A dichotomous variable to control for baseline e-cigarette use may not have been sensitive enough for our analyses to get a proxy of initiation. Limiting analyses to a e-cigarette use naïve youth sample could help to disentangle nuances between onset and maintenance of use. Finally, future work should consider examining sleep problems via additional sleep measures given the low internal consistency of the YSR sleep scale.
4.2. Clinical implications
Identifying neurobiological differences linked with adolescent e-cigarette use could help increase the armamentarium of behavioral and pharmacologic therapies to decrease sleep problems and depressive symptoms that increase risk for e-cigarette use. Moreover, these outcomes suggest that promoting healthy sleep, especially among adolescents with symptoms of depression, may have utility in reducing e-cigarette use. Fostering sleep hygiene, such as bedtime routines and limiting the use of technology prior to bedtime may provide benefits to adolescents with sleep problems. (Hall & Nethery, 2019). This could reduce the risk of e-cigarette use onset and/or continuation.
4.3. Conclusion
This study provides enhanced insight into potential neurobiological, sleep-related, and mental health factors associated with adolescent e-cigarette use. We observed that adolescents with higher rsFC between the amygdala and anterior insula reported greater sleep problems, and, in turn higher depression levels, and ultimately more days of e-cigarette use.
Supplementary Material
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