Regulation of TH17 plasticity and stemness by mTORC1

项目描述/摘要 血统承诺和维护是各种生物系统的基本过程。在 在免疫系统中，失调的T细胞应答是许多过敏性和炎性病症的原因。 TH 17细胞在多发性硬化症（MS）及其小鼠模型中起关键的致病作用， 自身免疫性脑脊髓炎（EAE）。TH 17细胞的一个独特特征是它们固有的可塑性， 成熟的效应TH 17细胞具有其他T细胞亚群的特征，特别是TH 1细胞，但这个过程如何 其功能意义仍然难以捉摸。T细胞代谢程序与细胞的协调 命运决定是适应性免疫的基本过程，但代谢途径如何与 免疫信号在T细胞命运决定和自身免疫失调中的作用还不清楚。特别是 代谢程序在效应T细胞可塑性和致病性中的功能仍然基本上未被探索。 我们假设TH 17细胞的固有异质性是其谱系可塑性的基础;终末分化和持续干细胞性之间的平衡取决于mTORC 1信号传导和代谢重编程，并有助于自身免疫性炎症。目标1.确定转录机制和发育轨迹 潜在的TH 17末端分化和干性。目标二。建立信号和代谢 mTORC 1在TH 17反应中的作用机制。目标3：建立TH 17的代谢控制和信号通路 可塑性很少有描述的分子途径调节TH 17谱系可塑性。我们认为 对TH 17可塑性代谢控制的了解可以建立T细胞命运控制的新范例 机制，并表现出自身免疫性疾病的合法治疗机会。

Program Description/Abstract Lineage commitment and maintenance are fundamental processes in a variety of biological systems. In the immune system, dysregulated T cell responses are the cause of many allergic and inflammatory disorders. TH17 cells play a key pathogenic role in Multiple sclerosis (MS) and its murine model, experimental autoimmune encephalomyelitis (EAE). A unique feature of TH17 cells is their inherent plasticity that endows mature effector TH17 cells with characteristics of other T cell subsets especially TH1 cells, but how this process is controlled and its functional significance remain elusive. Coordination of T cell metabolic programs with cell fate decisions is a fundamental process in adaptive immunity, but how metabolic pathways intersect with immune signals in T cell fate decisions and autoimmune dysregulation is poorly defined. In particular, the function of metabolic programs in effector T cell plasticity and pathogenicity remains essentially unexplored. We hypothesize that the inherent heterogeneity of TH17 cells underlies their lineage plasticity; the balance between terminal differentiation and sustained stemness depends upon mTORC1 signaling and metabolic reprogramming, and contributes to autoimmune inflammation. Aim 1. Determine transcriptional mechanisms and developmental trajectory underlying TH17 terminal differentiation and stemness. Aim 2. Establish the signaling and metabolic mechanisms of mTORC1 in TH17 responses. Aim 3. Establish metabolic control and signaling circuits of TH17 plasticity. There has been little description of molecular pathways regulating TH17 lineage plasticity. We argue that insight into metabolic control of TH17 plasticity could establish a new paradigm of T cell fate control mechanisms, and manifest legitimate therapeutic opportunities for autoimmune diseases.