The metabolic-epigenetic axis in memory

记忆中的代谢-表观遗传轴

基本信息

批准号：
10399581
负责人：
SHELLEY L BERGER
金额：
$ 44.91万
依托单位：
UNIVERSITY OF PENNSYLVANIA
依托单位国家：
美国
项目类别：
财政年份：
2019
资助国家：
美国
起止时间：
2019-05-15 至 2024-04-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10399581
关键词：
Abstinence Acetate-CoA Ligase Acetates Acetyl Coenzyme A Alcohol abuse Alcoholic beverage heavy drinker Alcohols Attention Behavior Behavioral Binding Brain CRISPR/Cas technology Carbon Cell Nucleus Cells Chromatin Chromatin Loop Cytoplasm Data Deposition Disease Dorsal Enhancers Enzymes Epigenetic Process Ethanol Family member Future Gene Expression Generations Genes Genetic Genetic Transcription Genome Genomics Higher Order Chromatin Structure Hippocampus (Brain)Histone Acetylation Histone Deacetylase Histones Human In Vitro Investigation Learning Link Mass Spectrum Analysis Mediating Memory Memory impairment Mental disorders Metabolic Metabolism Mitochondria Modeling Modification Molecular Mus Neurobiology Neuroglia Neurologic Neuronal Differentiation Neuronal Plasticity Neurons Nuclear Pathway interactions Pharmaceutical Preparations Pharmacology Pharmacotherapy Play Population Post-Translational Protein Processing Proteins Regulation Regulatory Element Regulatory Pathway Relapse Rodent Role Societies Substance Use Disorder Therapeutic Therapeutic Intervention Transcript Transcriptional Regulation Work addiction alcohol behavior alcohol exposure alcohol use disorder base behavioral phenotyping chromatin modification chromatin remodeling classical conditioning cognitive process conditioned place preference craving epigenetic regulation epigenome genome-wide histone acetyltransferase improved in vivo inhibitor knock-down mouse model neuropsychiatry novel novel therapeutics object recognition promoter protein complex recruit response small hairpin RNA small molecule spatial memory targeted treatment therapeutic target tool transcriptome sequencing

项目摘要

Abstract Understanding the molecular machinery underlying learning is critical to improve therapies for memory-related disorders that continue to burden our society. We recently identified a connection between cellular metabolism, epigenetic regulation, and memory-related neuronal plasticity. We found that ACSS2, a metabolic enzyme that generates acetyl-CoA is chromatin-bound in hippocampal neurons and required for long-term spatial memory, a cognitive process that relies on histone acetylation and gene expression. While these results established a strong functional link between nuclear acetyl-CoA generation by ACSS2, histone acetylation, transcription and memory, the exact molecular underpinnings of this metabolic- epigenetic axis remain to be elucidated. Here we propose to explore this phenomenon in further mechanistic detail. In particular, we aim to identify ACSS2-associated proteins, examine the mechanism of ACSS2 recruitment to specific genes, and identify higher-order structures that contribute to ACSS2-mediated transcriptional regulation via chromatin looping. Moreover, we will explore dorsal hippocampal transcriptional and epigenetic changes that accompany memory formation in a hippocampus-dependent mammalian learning model (spatial object recognition). We will assess genome-wide changes in transcript abundance and chromatin accessibility, study the enrichment of histone post-translational modifications, and the re-distribution of ACSS2 and select histone acetyl marks. Finally, using an array of pharmacological and genetic tools, we will assess the contribution of ACSS2 to the observed transcriptional, epigenetic and behavioral phenotypes. In addition, our preliminary data under Aim 3 indicate that ethanol-derived acetyl-groups are rapidly incorporated into neuronal chromatin in an ACSS2-dependent manner. This remarkably rapid epigenetic response might underlie alcohol-induced transcriptional and behavioral maladaptations in heavy drinkers. Indeed, we found that treating primary hippocampal neurons with acetate (the alcohol-derived metabolite and direct substrate of ACSS2) upregulates learning and memory-related genes and that ACSS2 reduction eliminates alcohol-related associative learning in conditioned place preference. We will explore hippocampal transcriptional and epigenetic changes associated with alcohol exposure in mice in vivo and assess the contribution of ACSS2 to molecular and cellular alterations induced by alcohol. Further, we will assess the effect of small molecule ACSS2 inhibitors on alcohol-related behaviors, as a basis for future therapeutic interventions. Overall, this work will significantly advance the field by characterizing the metabolic-epigenetic axis in the context of learning neurobiology. Furthermore, we expect our studies to identify efficacious novel therapeutic avenues for memory impairments and associated neurological and psychiatric conditions.

抽象的了解学习背后的分子机制对于改善记忆相关的治疗至关重要继续给我们的社会带来负担的疾病。我们最近发现了细胞代谢之间的联系，表观遗传调控和记忆相关的神经元可塑性。我们发现 ACSS2，一种代谢酶，生成乙酰辅酶A，与海马神经元染色质结合，是长期空间记忆所必需的，依赖于组蛋白乙酰化和基因表达的认知过程。虽然这些结果在核乙酰辅酶 A 生成之间建立了强大的功能联系 ACSS2，组蛋白乙酰化、转录和记忆，这种代谢的确切分子基础表观遗传轴仍有待阐明。在这里，我们建议进一步探讨这种现象的机制细节。特别是，我们的目标是鉴定 ACSS2 相关蛋白，检查 ACSS2 的机制招募特定基因，并识别有助于 ACSS2 介导的高阶结构通过染色质环进行转录调控。此外，我们将探索背侧海马转录以及海马依赖性哺乳动物学习中伴随记忆形成的表观遗传变化模型（空间物体识别）。我们将评估转录本丰度的全基因组变化染色质可及性，研究组蛋白翻译后修饰的富集和重新分布 ACSS2 并选择组蛋白乙酰标记。最后，使用一系列药理学和遗传工具，我们将评估 ACSS2 对观察到的转录、表观遗传和行为表型的贡献。此外，我们在目标 3 下的初步数据表明，乙醇衍生的乙酰基团正在迅速以 ACSS2 依赖性方式整合到神经元染色质中。这种非常快速的表观遗传反应可能是酗酒者酒精诱导的转录和行为适应不良的基础。事实上，我们发现用醋酸盐（酒精衍生的代谢物和 ACSS2 的直接底物）上调学习和记忆相关基因，并且 ACSS2 减少消除了条件性位置偏好中与酒精相关的联想学习。我们将探索海马体体内与小鼠酒精暴露相关的转录和表观遗传变化并评估 ACSS2 对酒精诱导的分子和细胞改变的贡献。此外，我们将评估小分子 ACSS2 抑制剂对酒精相关行为的影响，作为未来治疗的基础干预措施。总体而言，这项工作将通过表征代谢-表观遗传轴来显着推进该领域的发展学习神经生物学的背景。此外，我们希望我们的研究能够确定有效的小说记忆障碍及相关神经和精神疾病的治疗途径。