IDO基因修饰的树突状细胞抑制造血干细胞移植物中T细胞增殖反应的体外研究
发布时间:2018-10-05 09:19
【摘要】:同种异基因造血干细胞移植(Allogeneic Hematopoietic Stem Cell Transplantation,Allo-HSCT)是治疗恶性血液疾病、血液系统遗传性疾病、再生障碍性贫血等疾病的一种有效方法,并获得较好的疗效。但移植物抗宿主病(Graft Versus Host Disease,GVHD)仍然是其主要的并发症,导致多器官损伤,免疫失调和感染,以致于接受MHC-相配或无关供者移植后的患者10—50%因这种严重的并发症而死亡,这严重限制了alloHSCT的应用和发展。GVHD是由供者移植物中的T淋巴细胞识别宿主主要和次要组织相容性抗原引起的免疫反应。这些抗原由抗原递呈细胞(APCs)呈递后,通过MHC-Ⅰ、Ⅱ分子结合于供者T细胞,从而激活T细胞,发生GVHD。尽管人们采用了各种各样的方法来预防和治疗GVHD,但至今仍然没有一种令人满意的方法。在移植前去除移植物中T淋巴细胞虽然可以有效防止GVHD发生,但肿瘤复发和感染的几率却大大增加,移植物成活的几率也因T细胞的减少而降低,因此并没有降低患者的总体死亡率。一些临床和实验研究已经表明引起GVHD和移植物抗白血病作用(Graft Versus Leukocythemia,GVL)的T细胞具有异质性,并且可以分离。体外也可以扩增针对肿瘤特异性抗原的T淋巴细胞,体内应用能够介导GVL作用而不会导致GVHD的发生。 树突状细胞(Dendritic CelI,DC)是一种功能最强大的抗原递呈细胞,在识别和递呈抗原启动免疫应答、诱导移植免疫排斥中起着重要的作用。人们一直认为,DC是抗原递呈能力最强的抗原递呈细胞(APC),是唯一能激活初始型T细胞的APC,具有激活移植排斥反应的作用。但是近年来的研究表明,DC是一类异质细胞群体,具有不同的亚群和不同的功能状态,不仅在增强免疫反应上具有特别重要的作用,也具有诱导特异性免疫耐受的作用。基因修饰的DC可以用来人工调控免疫反应,比如
[Abstract]:Allogeneic hematopoietic stem cell transplantation (Allogeneic Hematopoietic Stem Cell Transplantation,Allo-HSCT) is an effective method for the treatment of malignant blood diseases, hereditary diseases of blood system, aplastic anemia and so on. But graft-versus-host disease (Graft Versus Host Disease,GVHD) remains a major complication, leading to multiple organ damage, immune disorders and infections, resulting in 10-50% of patients receiving MHC- matching or unrelated donor transplants who die from this serious complication. This severely limits the application and development of alloHSCT. GVHD is an immune response caused by the recognition of host major and secondary histocompatibility antigens by T lymphocytes in donor grafts. These antigens are presented by antigen-presenting cells (APCs), which bind to donor T cells through MHC- 鈪,
本文编号:2252840
[Abstract]:Allogeneic hematopoietic stem cell transplantation (Allogeneic Hematopoietic Stem Cell Transplantation,Allo-HSCT) is an effective method for the treatment of malignant blood diseases, hereditary diseases of blood system, aplastic anemia and so on. But graft-versus-host disease (Graft Versus Host Disease,GVHD) remains a major complication, leading to multiple organ damage, immune disorders and infections, resulting in 10-50% of patients receiving MHC- matching or unrelated donor transplants who die from this serious complication. This severely limits the application and development of alloHSCT. GVHD is an immune response caused by the recognition of host major and secondary histocompatibility antigens by T lymphocytes in donor grafts. These antigens are presented by antigen-presenting cells (APCs), which bind to donor T cells through MHC- 鈪,
本文编号:2252840
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