Synaptic tagging in the lateral amygdala fear conditioning circuit

外侧杏仁核恐惧调节回路中的突触标记

• 批准号: 7482804
• 负责人: LINNAEA E OSTROFF
• 金额: $ 5.13万
• 依托单位: NEW YORK UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7482804
• 关键词: Address; Amygdaloid structure; Animal Experiments; Animals; Anisomycin; Area; Auditory; Cannulas; Cells; Chromosome Pairing; Condition; Conditioned Stimulus; Contralateral; Cyclic AMP-Dependent Protein Kinases; Data; Dependence; Disease; Electric Stimulation; Electrodes; Electron Microscopy; Frequencies; Fright; Geniculate body structure; Hippocampus (Brain); Hour; Implant; Individual; Injection of therapeutic agent; Intralaminar Nuclear Group; Ipsilateral; Lateral; Learning; Long-Term Potentiation; Maintenance; Medial; Memory; Mental disorders; Modeling; Numbers; Pain; Pathway interactions; Phobic anxiety disorder; Plastics; Process; Production; Protein Biosynthesis; Protein Synthesis Inhibition; Protein Synthesis Inhibitors; Proteins; Protocols documentation; Rattus; Recruitment Activity; Relative (related person); Role; Short-Term Memory; Signal Transduction; Stimulus; Synapses; Synaptic plasticity; Testing; Thalamic structure; Time; Tracer; Training; Translations; base; conditioned fear; conditioning; long term memory; prevent; response; size; therapy development; transmission process

DESCRIPTION (provided by applicant): Auditory fear conditioning, a learning paradigm in which a rat can form an association between a previously neutral tone and a painful stimulus, is believed to occur via the persistent strengthening of synaptic connections, termed long-term potentiation (LTP), in the lateral amygdala (LA). Protein synthesis is necessary for both consolidation and reconsolidation of fear conditioning memory, and this may suggest a role for synapse remodeling. Auditory information enters the LA via plastic synapses from both the thalamus and cortex, but the functional and anatomical relationship between these synapses is unclear. The proposed project will begin to investigate the relative roles of these synapses in fear conditioning memory and their structural underpinnings. First, the protein synthesis-dependence of LTP consolidation and reconsolidation will be compared between the cortical and thalamic input pathways using a behaviorally relevant induction protocol. Second, serial section electron microscopy will be used to examine ultrastructural changes in LA synapses that occur during consolidation of fear conditioning and LTP, including changes in synapse size, synapse number, and local protein synthesis. Tracer injections will allow comparison of cortical and thalamic synapses under all conditions. A better understanding of the synaptic basis of the formation and maintenance of fear memories is important for the development of interventions for psychiatric disorders involving fear associations, such as phobias.

描述（由申请人提供）：听觉恐惧条件反射是一种学习范例，其中大鼠可以在先前的中性音调和疼痛刺激之间形成关联，据信通过外侧杏仁核（LA）中突触连接的持续加强（称为长时程增强（LTP））发生。蛋白质合成是必要的巩固和再巩固的恐惧条件记忆，这可能表明突触重塑的作用。听觉信息通过丘脑和皮层的可塑性突触进入LA，但这些突触之间的功能和解剖关系尚不清楚。拟议的项目将开始调查这些突触在恐惧条件记忆中的相对作用及其结构基础。首先，蛋白质合成依赖的LTP巩固和再巩固将比较皮质和丘脑之间的输入途径，使用行为相关的诱导协议。其次，连续切片电子显微镜将被用来检查超微结构的变化，在巩固的恐惧条件反射和LTP，包括突触大小，突触数量和局部蛋白质合成的变化过程中发生的LA突触。示踪剂注射将允许在所有条件下比较皮质和丘脑突触。更好地了解恐惧记忆形成和维持的突触基础对于开发涉及恐惧协会的精神疾病（如恐惧症）的干预措施非常重要。