Novel Growth Factor Regulators of Early Erythropoieisis

早期红细胞生成的新型生长因子调节剂

• 批准号: 9916811
• 负责人: Allon Moshe Klein
• 金额: $ 63.78万
• 依托单位: UNIV OF MASSACHUSETTS MED SCH WORCESTER
• 依托单位国家: 美国
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-04-15 至 2022-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9916811
• 关键词: Acute; Address; Adult; Altitude; Anemia; Area; BFU-E; Biological; Biological Process; Blood; Bone Marrow; CFU-E; Cells; Chronic; Clinical; Colony-forming units; Complex; Development; Diamond-Blackfan anemia; Disease; Dysmyelopoietic Syndromes; Erythroblasts; Erythrocytes; Erythroid; Erythropoiesis; Erythropoietin; Etiology; Failure; Genetic Transcription; Glucocorticoids; Growth Factor; Growth Factor Receptors; Hematopoietic; Hematopoietic stem cells; Hemorrhage; Hormones; Human; Hypoxia; IL17 gene; In Vitro; Inflammation; Interleukin-17; Investigation; Laboratories; Life; Ligands; Mediating; Molecular; Mus; Output; Oxygen; Pathway interactions; Pharmaceutical Preparations; Phase; Physiology; Population; Process; Publications; Regulation; Resistance; Role; Scheme; Series; Signal Pathway; Signal Transduction; Stress; Structure; Technology; Testing; Time; Tissues; Work; base; cytokine; erythroid differentiation; extracellular; genome-wide; hematopoietic hierarchy; in vivo; in vivo Model; inhibitor/antagonist; irradiation; mouse genetics; mouse model; myelodysplastic anemia; novel; progenitor; prospective; receptor; response; single-cell RNA sequencing; stem cell differentiation; stem cells

Project Summary Erythropoiesis is the tightly regulated process by which red blood cells are formed from hematopoietic stem cells. Clinically, the only erythropoiesis-stimulating agents available for the treatment of anemia are the hormone erythropoietin (Epo), and glucocorticoids, leaving a gap where they are ineffective or contraindicated. In this inter-disciplinary project, we will use in vivo mouse models of erythropoietic stress, mouse genetics, and cutting-edge scRNA-Seq approaches to explore a largely uncharted area of non-Epo growth factor signaling and regulatory mechanisms in early erythroid progenitors. We will specifically focus on a potent new regulator that we have discovered: the cytokine IL-17, which we found stimulates both human and mouse erythroid progenitors, acting specifically through its receptor IL-17RA. We first identified IL17 as a novel erythropoietic regulator by overcoming an important technical challenge in studying erythropoiesis. Until recently, a major challenge in identifying novel erythropoietic regulators was a lack of information about the earliest stages of erythroid differentiation from stem cells. Early progenitors could only be defined retrospectively by their erythroid colony forming potential, namely “burst” forming units and colony forming units [BFU-e(rythroid) and CFU-e respectively]. FACS-based schemes could enrich for BFU-e/ CFU-e, but not purify them. We have now, for the first time, prospectively isolated distinct early stages of erythropoiesis, guided by novel single cell RNA sequencing (scRNA-Seq) technology and using FACS. We found that these newly defined progenitors express multiple growth factor receptors that were not previously recognized as erythroid regulators, and we identified an erythropoietic regulatory role for the first three such growth-factor receptors that we tested, including IL-17. Our project is structured around three aims: we will determine IL-17 pathway components involved in erythropoietic control, the cell biological and transcriptional responses to IL-17 in erythroid and non-erythroid blood progenitors, and finally, we will investigate the ability of IL-17RA activation to modulate erythropoiesis in mice in stress and disease, including anemic conditions. In the process, we will apply scRNA-seq technology to reveal the dynamic structure of the hematopoietic/erythropoietic hierarchies in physiology, disease and during stress, and the sensitivity of these stem and progenitor cell hierarchies to IL-17 signaling.

项目摘要 红细胞生成是由造血干细胞形成红细胞的严格调控过程。 细胞。临床上，唯一可用于治疗贫血的促红细胞生成剂是 激素促红细胞生成素(EPO)和糖皮质激素，在它们无效或禁忌的地方留下缺口。 在这个跨学科的项目中，我们将使用体内小鼠模型的红细胞生成应激，小鼠遗传学，和 探索非促红细胞生成素生长因子信号转导的前沿scRNA-Seq方法 和早期红系祖细胞的调节机制。我们将特别关注一个强有力的新监管机构 我们已经发现：我们发现的细胞因子IL-17可以刺激人和小鼠的红系 祖细胞，通过其受体IL-17RA特异性地发挥作用。 我们首次确定IL17是一种新的红细胞生成调节剂，通过克服 研究红血球生成。直到最近，寻找新的促红细胞生成素调节剂的一个主要挑战是 缺乏关于干细胞向红系分化的最早阶段的信息。早期的祖先可能 只能通过其红系集落形成潜力，即“爆裂”形成单位和 集落形成单位[BFU-e(拟除虫菊酯)和CFU-e]。基于FACS的方案可以丰富BFU-e/ Cfu-e，但不是净化它们。我们现在第一次有可能分离出截然不同的早期阶段 红细胞生成，由新的单细胞RNA测序(scRNA-Seq)技术指导，并使用FACS。我们 发现这些新定义的祖细胞表达多种生长因子受体，这是以前没有的 被认为是红系调节因子，我们确定了前三种红系调节因子的作用 我们测试的生长因子受体，包括IL-17。 我们的项目围绕三个目标构建：我们将确定参与其中的IL-17途径组件 红系和非红系细胞对IL-17的细胞生物学和转录反应 造血祖细胞，最后，我们将研究IL-17RA激活对红细胞生成的调节能力 处于应激和疾病状态的小鼠，包括贫血情况。在此过程中，我们将应用scrna-seq技术。 揭示造血/红系在生理学、疾病和免疫方面的动态结构 在应激过程中，这些干细胞和祖细胞对IL-17信号的敏感性。