HUMAN DENDRITIC CELLS AND THE ONSET OF INNATE AND ADAPTIVE IMMUNITY IN ALLOGENEIC

项目3：人类树突状细胞与同种异体先天免疫和获得性免疫的启动 造血移植 这一新项目将坚持P01的主题重点，即异基因移植后的早期事件 促进免疫重建和维持自由的造血干细胞移植 远离旧病复发。T细胞对次要组织相容性抗原(MIHA)的反应与自然发育 杀伤(NK)细胞系与移植后早期发生的这些过程密切相关。至 提高我们对这些免疫反应背后的生物机制的理解，我们将重点放在 免疫反应的传入臂，而不是传出臂或效应臂，并识别不同的角色 由特定亚型的人树突状细胞(DC)发挥作用。然后将在临床前小鼠身上进行测试。 模特。我们的目标是最终针对一种或另一种DC亚型进行基于免疫的干预 为了将移植物抗宿主病(GvHD)的并发症与移植物抗宿主病(GVHD)的预期益处分开 肿瘤/白血病/淋巴瘤(GVT/GVL)和天然免疫和获得性免疫的成功重建 抗原呈递的水平。因此，我们将通过(1)测试CD34+派生的 朗格汉斯型树突状细胞(LCS)刺激针对Minor的更强大的T细胞反应 组织相容性AGS(MIHA)优于其他两种类型的常规或髓系树突状细胞； 哪种人类DC类型在形成NK细胞抑制KIR谱系和免疫学方面最有效 发生机制(S)；以及(3)使用小鼠移植模型评估相对效力 骨髓来源的DC(人单核细胞来源的DC)与LCS和真皮间质DC的比较 (DDC-IDCs)在GVH和GVT/GVL反应中。对细胞机制的更深入的理解 这些过程的基础，特别是特定DC亚型的贡献，应该阐明 控制点以操纵异基因造血干细胞移植后的免疫结果。 世俗总结和公共卫生相关性：被称为树突状细胞的特殊白细胞至关重要 对白血病、淋巴瘤和其他肿瘤的移植患者的免疫力。了解 树突状细胞在移植中的作用应有助于医生更好地控制疾病的发展 免疫系统。这应该有利于预防疾病复发和重新发展有益的免疫力，

PROJECT 3: Human dendritic cells and the onset of innate andadaptive immunity in allogeneic hematopoietic transplantation This new project will adhere to the thematic emphasis of this P01 on the early events after allogeneic hematopoietic stem cell transplantation (alloHSCT) that promote immune reconstitution and sustain freedom from relapse. T cell responses against minor histocompatibility Ags (miHA) and development of the natural killer (NK) cell repertoire are critically intertwined with these processes occurring early post-transplant. To improve our understanding of the biologic mechanisms underlying these immune responses, we will focus on the afferent, rather than efferent or effector arm of the immune response, and identify the distinct roles played by defined subtypes of human dendritic cells (DCs). These will then be tested in a preclinical mouse model. Our intention is eventually to target immune-based interventions to one or another DC subtype, in order to isolate the complications of graft-vs-host disease (GvHD), from the desired benefits of graft-vs- tumor/leukemia/lymphoma (GvT/GvL) and successful reconstitution of innate and adaptive immunity, at the level of antigen presentation. We will therefore approach these issues by (1) testing whether CD34+-derived Langerhans-type dendritic cells (LCs) stimulate more robust T cell responses against minor histocompatibility Ags (miHA) than do the other two types of conventional or myeloid DCs; (2) determining which human DC type is most effective in shaping the NK cell inhibitory KIR repertoire and the immunologic mechanism(s) by which this occurs; and (3) using mouse transplant models to evaluate the relative potency of bone marrow derived DCs (human monocyte-derived DC counterparts) vs LCs and dermal-interstitial DCs (DDC-IDCs) in GvH and GvT/GvL responses. An improved understanding of the cellular mechanisms underlying these processes, and in particular the contribution of specific DC subtypes, should elucidate control points to manipulate immunologic outcomes after alloHSCT. Lay summary and public health relevance: Specialized white blood cells, called dendritic cells, are critical to the immunity of patients transplanted for leukemia, lymphoma, and other tumors. Understanding the function of dendritic cells in the context of transplantation should help doctors better control the developing immune system. This should favor prevention of disease recurrence and redevelopment of helpful immunity,