Associations of LGBTQ+ Identities With Acceptability and Efficacy of Online Single-Session Youth Mental Health Interventions.

Barriers such as stigma, financial costs, and provider shortages prevent large portions of youth with depression and related difficulties from accessing treatment; lesbian, gay, bisexual, transgender, queer/questioning sexual orientation, or other non-heterosexual identity (LGBTQ+) youth are burdened with additional barriers related to minority stress. Single-session interventions (SSIs) have been found to benefit youth and help reduce depression symptoms, and since many SSIs are brief, cost-free, and accessible online, they may circumvent several access barriers. However, prior to recommending non-community-tailored SSIs as a useful resource for minoritized youths, we first assessed whether LGBTQ+ youth respond as positively to SSIs as do cisgender heterosexual youth. In a subsample of youths recruited via online advertisements from September 2019 to August 2020 (N = 258, 81.4% female-assigned sex at birth, 60.5% LGBTQ+, 47.3% youth of color), we investigated whether changes in hopelessness, agency, and self-hate from before to after completing online self-directed SSIs differed as a function of LGBTQ+ identity. We also quantitatively and qualitatively compared intervention acceptability ratings and feedback across LGBTQ+ and cisgender heterosexual youths. Analyses revealed no significant differences between cisgender LGBQ+, trans and gender diverse, and cisgender heterosexual youths for any intervention outcomes. Likewise, no group differences emerged in intervention acceptability ratings or written program feedback. Self-selection bias and underrepresentation of certain populations, such as American Indian and Alaskan Native youths, may limit generalizability of results. Results suggest that online mental health SSIs are equally acceptable and useful to LGBTQ+ and cisgender heterosexual youth alike, even prior to culturally specific tailoring.

Disordered eating across COVID-19 in LGBTQ+ young adults.

Emerging evidence suggests that the COVID-19 pandemic is negatively affecting mental health, especially for sexual and gender minority populations. Relatively little is known about the impact of the pandemic on disordered eating behaviors (DEB) for these populations. The aim of this study is to understand changes in DEB across COVID-19 within an LGBTQ+ sample, with a particular focus on differences across sexual and gender identities, and the impact of social support on these outcomes. In a sample of 830 LGBTQ+ adults with a past year history of DEB, most, but not all, participants reported that the frequency of and urge to engage in each DEB increased a little bit or a lot during COVID-19. Contrary to research showing more severe psychopathology and DEB among gender minorities (GM) compared to sexual minorities (SM), changes in DEB severity since COVID-19 were not significantly different between SM and GM participants. There were a few small and significant relationships between changes in average DEB severity and characteristics of interpersonal relationships, average quality of home relationships, and living with someone not affirming of one's identity. Results highlight that COVID-19 may have exacerbated DEB for SGM young adults, that these changes were not different across sexual versus gender minorities, and that these changes are weakly but significantly related to minority stressors.

Associations between weight-based teasing and disordered eating behaviors among youth.

Weight-based teasing (WBT) is commonly reported among youth and is associated with disinhibited and disordered eating. Specifically, youth who experience WBT may engage in disordered eating behaviors to cope with the resultant negative affect. Therefore, we examined associations between WBT and disordered eating behaviors among youth and assessed whether negative affect mediated these relationships. Two hundred one non-treatment seeking youth (8-17y) completed questionnaires assessing WBT, disinhibited eating, depression, and anxiety. Disordered eating and loss-of-control (LOC) eating were assessed via semi-structured interview. Analyses of covariance were conducted to examine relationships between WBT and eating-related variables, and bootstrapping mediation models were used to evaluate negative affect (a composite of depressive and anxiety symptoms) as a mediator of these associations. All models were adjusted for sex, race, age, and adiposity. Among 201 participants (13.1 ± 2.8y; 54.2% female; 30.3% Black; 32.8% with overweight/obesity), WBT was associated with emotional eating, eating in the absence of hunger, and disordered eating attitudes and behaviors (ps ≤ 0.02). These associations were all mediated by negative affect. WBT was also associated with a threefold greater likelihood of reporting a recent LOC eating episode (p = .049). Among boys and girls across weight strata, WBT was associated with multiple aspects of disordered eating and these relationships were mediated by negative affect. Longitudinal studies are needed to clarify the directionality of these associations and to identify subgroups of youth that may be particularly vulnerable to WBT and its sequelae.

Weight-based teasing in youth: Associations with metabolic and inflammatory markers.

BACKGROUND: Research among adults suggests that weight stigma is associated with worsened cardiometabolic health. However, these relationships have not been examined among youth. OBJECTIVE: Assess associations between weight-based teasing (WBT) and metabolic and inflammatory markers among two samples of youth: (1) a non-treatment-seeking sample and (2) a weight loss treatment-seeking sample with obesity. METHOD: Weight, height, adiposity, waist circumference and blood pressure were measured. Fasting blood samples were collected for metabolic (triglycerides, glucose, high-density lipoprotein cholesterol) and inflammatory analytes (high-sensitivity C-reactive protein in Study 1 and erythrocyte sedimentation rate in both studies). Youths completed the Perception of Teasing Scale, a measure of WBT. Metabolic and inflammatory indices were compared between those with and without teasing, adjusting for demographics and body composition. RESULTS: Study 1 enrolled 201 non-treatment-seeking youth (Mage = 13.1y; 54.2% female; 44.8% non-Hispanic White; 32.8% with overweight/obesity); 15.4% reported WBT. Study 2 enrolled 111 treatment-seeking adolescents with obesity (Mage = 14.0y; 66.7% female; 37.8% non-Hispanic White); 73.0% reported WBT. Adjusting for covariates, WBT was not associated with cardiometabolic risk factors in either study. CONCLUSIONS: WBT was not associated with worsened cardiometabolic health. Longitudinal research is needed to elucidate associations between WBT and health in youth.

Biomechanical factors influencing successful self-righting in the pleurodire turtle Emydura subglobosa.

Self-righting performance is a key ability for most terrestrial animals, and has been used as a metric of fitness, exhaustion and thermal limits in a variety of taxa. However, there is little understanding of the underlying mechanisms that drive variation in self-righting performance. To evaluate the mechanical factors that contribute to success versus failure when animals attempt to self-right, we compared force production and kinematic behavior in the rigid-bodied, pleurodire turtle Emydura subglobosa between successful and unsuccessful self-righting efforts. We found that the moment exerted during efforts to roll the body and the velocity of that roll are the primary drivers behind self-righting success. Specifically, turtles that self-righted successfully produced both larger moments and faster rolls than turtles that failed. In contrast, the angle at which the head was directed to lever the body and the extent of yaw that was incorporated in addition to roll had little impact on the likelihood of success. These results show that specific performance metrics can predict the ability of animals to self-right, providing a framework for biomimetic applications as well as future comparisons to test for differences in self-righting performance across animals from different environments, sexes, populations and species.

Evolution of Osteocrin as an activity-regulated factor in the primate brain.

Sensory stimuli drive the maturation and function of the mammalian nervous system in part through the activation of gene expression networks that regulate synapse development and plasticity. These networks have primarily been studied in mice, and it is not known whether there are species- or clade-specific activity-regulated genes that control features of brain development and function. Here we use transcriptional profiling of human fetal brain cultures to identify an activity-dependent secreted factor, Osteocrin (OSTN), that is induced by membrane depolarization of human but not mouse neurons. We find that OSTN has been repurposed in primates through the evolutionary acquisition of DNA regulatory elements that bind the activity-regulated transcription factor MEF2. In addition, we demonstrate that OSTN is expressed in primate neocortex and restricts activity-dependent dendritic growth in human neurons. These findings suggest that, in response to sensory input, OSTN regulates features of neuronal structure and function that are unique to primates.

Genome-wide identification and characterization of functional neuronal activity-dependent enhancers.

Experience-dependent gene transcription is required for nervous system development and function. However, the DNA regulatory elements that control this program of gene expression are not well defined. Here we characterize the enhancers that function across the genome to mediate activity-dependent transcription in mouse cortical neurons. We find that the subset of enhancers enriched for monomethylation of histone H3 Lys4 (H3K4me1) and binding of the transcriptional coactivator CREBBP (also called CBP) that shows increased acetylation of histone H3 Lys27 (H3K27ac) after membrane depolarization of cortical neurons functions to regulate activity-dependent transcription. A subset of these enhancers appears to require binding of FOS, which was previously thought to bind primarily to promoters. These findings suggest that FOS functions at enhancers to control activity-dependent gene programs that are critical for nervous system function and provide a resource of functional cis-regulatory elements that may give insight into the genetic variants that contribute to brain development and disease.

A chemical genetic approach reveals distinct EphB signaling mechanisms during brain development.

EphB receptor tyrosine kinases control multiple steps in nervous system development. However, it remains unclear whether EphBs regulate these different developmental processes directly or indirectly. In addition, given that EphBs signal through multiple mechanisms, it has been challenging to define which signaling functions of EphBs regulate particular developmental events. To address these issues, we engineered triple knock-in mice in which the kinase activity of three neuronally expressed EphBs can be rapidly, reversibly and specifically blocked. We found that the tyrosine kinase activity of EphBs was required for axon guidance in vivo. In contrast, EphB-mediated synaptogenesis occurred normally when the kinase activity of EphBs was inhibited, suggesting that EphBs mediate synapse development by an EphB tyrosine kinase-independent mechanism. Taken together, our data indicate that EphBs control axon guidance and synaptogenesis by distinct mechanisms and provide a new mouse model for dissecting EphB function in development and disease.