Dissecting sodium appetite circuits in the mammalian brain

项目摘要 体内钠平衡是许多生理功能的关键，包括渗透调节和作用。 潜力。破译控制钠摄入量的机制对于理解 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，钠的食欲调节仍然缺乏。我 建议使用转录切除法研究控制我们体内离子平衡的基本大脑回路 和分子遗传工具。我们的初步和已发表的结果已经确定了特定的神经 小鼠后脑和前脑中敏锐地调节钠摄入量的种群。然而，它是 目前尚不清楚这些不同的神经节如何促进钠的食欲。我们的中心假设 是独特的神经回路调节钠的食欲和耐受性。我们将通过三个方面来测试这个想法 明确的目标。在目标1中，我们将使用功能增益和功能损失操作来检查单个神经细胞 人群控制着对钠的行为厌恶和/或吸引。这项研究预计将确定 每个基因定义的神经细胞群在钠摄取中的功能作用。在目标2中，我们 建议使用遗传学、病毒追踪和生理记录来解剖电路组织 潜在的钠摄入量。一旦确定了解剖图，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 从钠摄取神经元的下游区域识别细胞类型。我们将通过以下方式实现这一点： 上游依赖活性的高通量单细胞转录和神经扰动 人口。这一方法有望剖析接收钠摄取信号的特定细胞类型。 来自上游神经元。然后，我们将使用已识别的下游细胞类型的遗传信息来 研究来自不同核的信号如何相互作用来驱动钠的胃口。总而言之，这项提议将 提供对钠摄取背后的全脑调节机制的关键见解。

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.