Dissecting sodium appetite circuits in the mammalian brain

项目摘要 体内钠平衡对许多生理功能至关重要，包括钠的调节和作用 潜力解读控制钠摄入的机制对于理解 食欲调节和体内钠平衡的原理。我们对中央的理解 与口渴和饥饿等其他食欲回路相比，钠食欲调节仍然缺乏。我 我建议使用转录组学来研究这种控制我们内部离子平衡的基本大脑回路。 和分子遗传学工具。我们的初步和发表的结果已经确定了特定的神经 在小鼠后脑和前脑中的群体，急性调节钠摄入。但据 目前尚不清楚这些不同的神经节点如何促进钠的食欲。我们的核心假设 是不同的神经回路调节钠的食欲和耐受性。我们将通过三个测试来测试这个想法 具体目标。在目标1中，我们将使用增益和损失的功能操作，以检查是否个别神经 群体控制对钠的行为厌恶和/或吸引。这项研究预计将确定 每个遗传定义的神经群体在钠摄入中的功能作用。在目标2中， 我建议使用遗传学、病毒追踪和生理记录来剖析电路组织 潜在的钠摄入一旦解剖图被确定，我们将使用投影特定的神经 扰动以检查各个下游区域的功能。在目标3中，我们建议 从钠食欲神经元的下游区域鉴定细胞类型。我们将通过结合 活性依赖性高通量单细胞转录组学和上游神经扰动 人口这种方法有望解剖接受钠食欲信号的特定细胞类型 来自上游神经元。然后，我们将使用所识别的下游细胞类型的遗传信息， 研究来自不同核团的信号如何相互作用以驱动钠食欲。总之，这一提议将 为钠摄入的全脑调节机制提供重要见解。

Project Summary Internal sodium balance is critical for many physiological functions, including osmoregulation and action potentials. Deciphering the mechanisms that control sodium intake is essential for understanding the principles of appetite regulation and sodium homeostasis in the body. Our understanding of central sodium appetite regulation is still lacking compared to other appetite circuits such as thirst and hunger. I propose to study this fundamental brain circuit that controls our internal ion balance using transcriptomic and molecular genetic tools. Our preliminary and published results have identified specific neural populations in the mouse hindbrain and forebrain that acutely regulate sodium ingestion. However, it is currently unknown how these distinct neural nodes contribute to sodium appetite. Our central hypothesis is that distinct neural circuits regulate sodium appetite and tolerance. We will test this idea through three specific aims. In Aim 1, we will use gain- and loss-of-function manipulations to examine if individual neural populations control behavioral aversion and/or attraction toward sodium. This study is expected to identify the functional roles of each genetically defined neural population in sodium ingestion. In Aim 2, we propose to use genetics, virus tracing, and physiological recording to dissect the circuit organization underlying sodium ingestion. Once the anatomical map is identified, we will use projection specific neural perturbation to examine the function of the individual downstream regions. In Aim 3, we propose to identify cell types from downstream areas of sodium appetite neurons. We will achieve this by combining activity-dependent high-throughput single-cell transcriptomics and neural perturbation in the upstream population. This approach is expected to dissect specific cell types that receive sodium appetite signals from upstream neurons. We will then use genetic information of the identified downstream cell types to examine how signals from distinct nuclei interact to drive sodium appetite. Together, this proposal will provide critical insights into the brain-wide regulatory mechanisms underlying sodium ingestion.