Circuit functions of fast-spiking interneurons in the main olfactory bulb

项目总结/摘要 嗅觉系统对包括人类在内的哺乳动物的行为和生存的几个方面至关重要。的 嗅球是嗅觉系统的第一个加工站，构成了一个特殊的模型系统 用于神经编码的研究，能够在紧凑且良好的 组织结构。因此，了解嗅球内的局部回路计算将提供关键的见解 大脑功能的基本原理嗅球内突触抑制的广泛扰动 显著破坏了投射二尖瓣/簇状细胞的同步化和嗅觉引导的行为，强调了 抑制性中间神经元在局部回路计算中的中心作用。与大脑的其他区域相比， 然而，对于不同的抑制性中间神经元是如何 在嗅球内专门支持神经编码仍然是难以捉摸的，详细的知识如何 单一的突触相互作用有助于精确调节二尖瓣/簇状细胞的发放时间， 缺乏为了促进对嗅球中局部电路计算和神经编码的理解，本项目 因此，将直接检查二尖瓣/簇状细胞和高度保守的 但在急性小鼠脑切片中使用全细胞对记录， 以及药理学、形态重建、免疫染色和模拟。调查将 具体涉及三个目标：1）确定快速尖峰中间神经元如何调节二尖瓣/簇状细胞尖峰 定时，2）确定树突计算如何支持快速尖峰的中间神经元功能，以及3）确定如何 快速尖峰的中间神经元信号与神经活动相适应。

PROJECT SUMMARY/ABSTRACT The olfactory system is critical to several aspects of behavior and survival in mammals, including humans. The olfactory bulb is the first processing station of the olfactory system and constitutes an exceptional model system for the study of neural coding, capable of encoding a highly complex sensory space within a compact and well- organized structure. Understanding local circuit computation within the olfactory bulb will thus provide key insight into fundamental principles of brain function. Broad perturbation of synaptic inhibition within the olfactory bulb significantly disrupts projection mitral/tufted cell synchronization and olfactory-guided behavior, underscoring a central role of inhibitory interneurons in local circuit computation. In contrast to other regions of the brain such as neocortex and hippocampus, however, fundamental understanding of how the diverse inhibitory interneurons within the olfactory bulb specifically support neural coding has remained elusive, with detailed knowledge of how unitary synaptic interactions contribute to the precise regulation of mitral/tufted cell spike timing in particular lacking. To advance understanding of local circuit computation and neural coding in the olfactory bulb, this project will therefore directly examine unitary synaptic interactions between mitral/tufted cells and a highly-conserved but understudied class of fast-spiking interneurons, using whole-cell pair recordings in acute mouse brain slices together with pharmacology, morphological reconstruction, immunostaining, and simulations. Investigation will specifically address three aims: 1) determine how fast-spiking interneurons regulate mitral/tufted cell spike timing, 2) determine how dendritic computation supports fast-spiking interneuron function, and 3) determine how fast-spiking interneuron signaling adapts with neural activity.