Synaptic Structural Plasticity in the Drosophila Brain

果蝇大脑的突触结构可塑性

• 批准号: 7146182
• 负责人: Samuel M Kunes
• 金额: $ 22.41万
• 依托单位: HARVARD UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-08-15 至 2008-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7146182
• 关键词: Drosophilidae; brain; genetics; synapses

DESCRIPTION (provided by applicant): Our objective is to develop a new system for the study of synaptic structural plasticity in the mature brain. Using long term multi-photon imaging, we have found that synaptic connections in the adult Drosophila brain are dynamic, undergoing both formation and elimination over a period of several hours. This system offers to bring the power of Drosophila genetic analysis to bear on the question of synaptic structural plasticity within the CNS, and can be applied to regions of the brain with direct involvement in processes such as learning and memory. We seek support to develop this system into an important paradigm for the genetic analysis of synaptic plasticity. We will investigate the mechanism of this structural plasticity using multi- photon confocal imaging and image analysis methods. The structure of dynamic synapses will be investigated in detail by investigating their ultrastructure and function. A long-term imaging protocol for live behaving animals will be developed. Our initial studies indicate that hyper-activating neurons or over- expressing a gain-of-function Raf allele can induce changes in synapse architecture in the adult CNS. Whether neural activity regulates synaptic structural dynamics will be further addressed by imaging individual synapses while hyper-activating or suppressing activity in adult animals. To further explore the molecular mechanisms that regulate synaptic structure, we will initiate a large-scale genetic screen for regulators of synaptic architecture. Beyond the term of this proposal, these regulators will be characterized molecularly and studied in detail. Our ultimate goal is to manipulate the plasticity of the nervous system in order to provide avenues for restoring neural function after brain injury or disease. By understanding what molecules may regulate synaptic dynamics in a normal CNS, we may be able to induce specific changes in a brain damaged by disease or stroke, or that malfunctions in behavioral disorders.

描述(申请人提供)：我们的目标是开发一种新的系统来研究成熟大脑中的突触结构可塑性。利用长期多光子成像，我们发现成年果蝇大脑中的突触连接是动态的，在几个小时的时间里经历了形成和消除。该系统提供了将果蝇遗传分析的力量应用于中枢神经系统内突触结构可塑性的问题，并可应用于大脑中直接参与学习和记忆等过程的区域。我们寻求支持将该系统发展成为突触可塑性遗传分析的重要范例。我们将使用多光子共聚焦成像和图像分析方法来研究这种结构塑性的机制。动态突触的结构将通过研究它们的超微结构和功能来详细研究。将开发针对活体动物的长期成像方案。我们的初步研究表明，过度激活神经元或过度表达功能获得的Raf等位基因可以诱导成年中枢神经系统突触结构的变化。神经活动是否调节突触结构动力学将通过成像单个突触来进一步解决，同时在成年动物中过度激活或抑制活动。为了进一步探索调节突触结构的分子机制，我们将启动对突触结构调节因子的大规模遗传筛选。在这项提案的期限之外，将对这些调节剂进行分子表征和详细研究。我们的最终目标是操纵神经系统的可塑性，以便为脑损伤或疾病后恢复神经功能提供途径。通过了解哪些分子可能调节正常中枢神经系统中的突触动力学，我们或许能够在因疾病或中风而受损的大脑中诱导特定的变化，或者在行为障碍中诱导特定的变化。