The Role of Endocannabinoids in Adulthood Alcohol Drinking After Adolescent Social Isolation

内源性大麻素在青少年社会隔离后成年饮酒中的作用

• 批准号: 10739510
• 负责人: Valentina Vozella
• 金额: $ 17.61万
• 依托单位: SCRIPPS RESEARCH INSTITUTE, THE
• 依托单位国家: 美国
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-07-15 至 2025-06-30
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10739510
• 关键词: 2-arachidonylglycerol; Abstinence; Acute; Adolescence; Adolescent; Adult; Affect; Aggressive behavior; Alcohol consumption; Alcohols; Amygdaloid structure; Anxiety; Award; Behavior; Behavior Disorders; Behavioral; Brain; COVID-19 pandemic; Cell Nucleus; Chronic; Chronic stress; Coupled; Data; Development; Disease; Down-Regulation; Drug Targeting; Electrophysiology (science); Endocannabinoids; Female; Frequencies; Future; Glutamates; Grouping; Human; In Situ Hybridization; Individual; Intervention; Joints; Life; Lifestyle-related condition; Long-Term Effects; Longevity; MAGL inhibitor; Measures; Mediating; Modeling; Molecular; Monoacylglycerol Lipases; Phenotype; Physiological; Predisposition; Public Health; Rattus; Recording of previous events; Relapse; Research; Role; Sex Differences; Signal Transduction; Slice; Social Interaction; Social isolation; Stress; Stress and Coping; Synapses; Synaptic Transmission; System; Testing; Therapeutic; Training; Vulnerable Populations; Water; Wistar Rats; Work; adolescent binge drinking; alcohol exposure; alcohol preferring rats; alcohol seeking behavior; alcohol use disorder; anxiety reduction; anxiety-like behavior; anxiety-related behavior; anxious; comorbidity; coping mechanism; drinking; drug candidate; drug reward; druggable target; endogenous cannabinoid system; experience; experimental study; gamma-Aminobutyric Acid; glutamatergic signaling; insight; interdisciplinary approach; lipidomics; male; neuroadaptation; neurobiological mechanism; neuropsychiatric disorder; neurotransmission; new therapeutic target; peer; pharmacologic; preference; prevent; reduced alcohol use; sex; social stress; social stressor; stressor; synaptic function; therapeutic target; tool; trait; transmission process; treatment effect; underage drinking

PROJECT SUMMARY Chronic stress during the developmental period of adolescence increases the susceptibility to many neuropsychiatric diseases in adulthood, including alcohol drinking and anxiety-like behaviors. Social isolation is a particularly profound stressor with increasing human relevance, especially during the COVID-19 pandemic, when millions of adolescents have faced prolonged periods with limited and intermittent social interactions with peers. The endocannabinoid system (ECs) is critically involved in brain development and modulates synaptic transmission processes, including those in the central nucleus of the amygdala (CeA), a hub of stress and anxiety processing. A growing body of evidence indicates that adolescent social isolation stress and alcohol drinking hijacks the developing brain by disrupting the ECs and resulting in long-lasting synaptic neuroadaptations that predispose to alcohol use disorder (AUD), anxiety, aggressive behaviors, and social interaction deficits. Unlike adult alcohol exposure, the synaptic and behavioral effects of adolescent binge drinking often do not recover following periods of abstinence, suggesting that experiencing social isolation and alcohol drinking during adolescence has the potential to permanently disrupt the brain’s developmental trajectory. Here, I will utilize a modified model of intermittent social isolation stress to examine 1) the effect of intermittent social isolation on alcohol intake and preference during adolescence (PND28-56) in male and female Wistar rats and 2) identify the individual and synergistic consequences of adolescent social isolation and alcohol drinking on the EC- mediated mechanisms contributing to the anxiety-like behaviors and social interactions long-term effects. Additionally, I will assess the ECs neuroadaptations in the CeA and validate ECs as a potential drug target (AIM 1/K99). My hypothesis is that adolescent isolation stress and alcohol drinking induce lasting alterations on GABAergic and glutamatergic signaling in the CeA via maladaptive functions (downregulation) of the ECs (AIM 2/K99-R00). Finally, given that previous work as well as my preliminary data suggest that manipulating the ECs reduces alcohol drinking and anxiety-like behaviors, I will assess whether increasing endocannabinoids’ tone (i.e., 2-AG) during the abstinence period post-adolescence, by blocking ECs enzymatic degradation, is efficacious in reducing the anxious phenotype and in preventing drinking relapse in adulthood (AIM 3/R00). The K99 portion of this proposal involves extensive training using molecular and electrophysiological approaches to probe the functional protective role of the ECs system against later escalations in alcohol drinking and anxiety- like behaviors. Collectively, these experiments will provide critical insights into the impact of adolescent isolation stress and alcohol drinking on the resulting behavior and synaptic transmission in both sexes and will validate the ECs as druggable target for AUD and comorbid behaviors. The technical and conceptual training I will receive during this award will equip me with the multidisciplinary approach needed to continue this research line independently.

项目总结 青春期发育期的慢性应激增加了许多疾病的易感性 成年期的神经精神疾病，包括饮酒和类似焦虑的行为。社会孤立是 这是一种特别深刻的压力源，与人类的相关性越来越大，特别是在新冠肺炎大流行期间， 当数百万青少年长期面临有限和断断续续的社交互动时 同伴们。内源性大麻素系统(ECs)在脑发育中起重要作用，并调节突触 传递过程，包括杏仁中央核(CEA)的传递过程，杏仁核是压力和焦虑的中心 正在处理。越来越多的证据表明，青少年的社会孤立压力和饮酒 通过扰乱内皮细胞并导致持久的突触神经适应来劫持发育中的大脑 易患酒精使用障碍(AUD)、焦虑、攻击性行为和社交缺陷。不像 成人酒精暴露，青少年酗酒的突触和行为影响往往无法恢复 在禁欲时期之后，这表明在经历社交孤立和饮酒期间 青春期有可能永久性地扰乱大脑的发育轨迹。在这里，我将使用一个 对间歇性社会隔离应激模型的修正：1)间歇性社会隔离对个体心理健康的影响 雄性和雌性Wistar大鼠青春期酒精摄入量和喜好(PND28-56)和2)识别 青少年社会孤立和饮酒对欧共体的个体和协同影响-- 焦虑样行为的中介机制和社会互动的长期效应。 此外，我将评估内皮细胞在CEA中的神经适应，并验证内皮细胞是否为潜在的药物靶点(AIM 1/K99)。我的假设是，青春期的隔离压力和饮酒会导致 CEA中的GABA能和谷氨酸能信号通过ECs的适应功能异常(下调)(AIM) 2/K99-R00)。最后，鉴于之前的工作以及我的初步数据表明，操纵ECs 减少饮酒和焦虑样行为，我会评估增加内源性大麻素的语气 (2-AG)在青春期后禁欲期间，通过阻止ECs的酶降解，是 在减少焦虑表型和防止成年后饮酒复发方面有效(AIM 3/R00)。这个 该提案的K99部分包括使用分子和电生理方法进行广泛的培训 探索ECS系统对酒精饮酒和焦虑后来升级的功能保护作用- 类似的行为。总的来说，这些实验将为青少年孤立的影响提供重要的见解 应激和饮酒对两性行为和突触传递的影响 血管内皮细胞是AUD和共病行为的可用药靶点。我将接受的技术和概念培训 这一奖项将使我具备继续这一研究路线所需的多学科方法 独立的。