IDO基因修飾的樹突狀細(xì)胞抑制造血干細(xì)胞移植物中T細(xì)胞增殖反應(yīng)的體外研究
發(fā)布時間:2018-10-05 09:19
【摘要】:同種異基因造血干細(xì)胞移植(Allogeneic Hematopoietic Stem Cell Transplantation,Allo-HSCT)是治療惡性血液疾病、血液系統(tǒng)遺傳性疾病、再生障礙性貧血等疾病的一種有效方法,并獲得較好的療效。但移植物抗宿主病(Graft Versus Host Disease,GVHD)仍然是其主要的并發(fā)癥,導(dǎo)致多器官損傷,免疫失調(diào)和感染,以致于接受MHC-相配或無關(guān)供者移植后的患者10—50%因這種嚴(yán)重的并發(fā)癥而死亡,這嚴(yán)重限制了alloHSCT的應(yīng)用和發(fā)展。GVHD是由供者移植物中的T淋巴細(xì)胞識別宿主主要和次要組織相容性抗原引起的免疫反應(yīng)。這些抗原由抗原遞呈細(xì)胞(APCs)呈遞后,通過MHC-Ⅰ、Ⅱ分子結(jié)合于供者T細(xì)胞,從而激活T細(xì)胞,發(fā)生GVHD。盡管人們采用了各種各樣的方法來預(yù)防和治療GVHD,但至今仍然沒有一種令人滿意的方法。在移植前去除移植物中T淋巴細(xì)胞雖然可以有效防止GVHD發(fā)生,但腫瘤復(fù)發(fā)和感染的幾率卻大大增加,移植物成活的幾率也因T細(xì)胞的減少而降低,因此并沒有降低患者的總體死亡率。一些臨床和實驗研究已經(jīng)表明引起GVHD和移植物抗白血病作用(Graft Versus Leukocythemia,GVL)的T細(xì)胞具有異質(zhì)性,并且可以分離。體外也可以擴(kuò)增針對腫瘤特異性抗原的T淋巴細(xì)胞,體內(nèi)應(yīng)用能夠介導(dǎo)GVL作用而不會導(dǎo)致GVHD的發(fā)生。 樹突狀細(xì)胞(Dendritic CelI,DC)是一種功能最強大的抗原遞呈細(xì)胞,在識別和遞呈抗原啟動免疫應(yīng)答、誘導(dǎo)移植免疫排斥中起著重要的作用。人們一直認(rèn)為,DC是抗原遞呈能力最強的抗原遞呈細(xì)胞(APC),是唯一能激活初始型T細(xì)胞的APC,具有激活移植排斥反應(yīng)的作用。但是近年來的研究表明,DC是一類異質(zhì)細(xì)胞群體,具有不同的亞群和不同的功能狀態(tài),不僅在增強免疫反應(yīng)上具有特別重要的作用,也具有誘導(dǎo)特異性免疫耐受的作用。基因修飾的DC可以用來人工調(diào)控免疫反應(yīng),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,
本文編號: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,
本文編號:2252840
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