骨髓间充质干细胞的免疫调节作用及其对GVHD影响的机制探讨
发布时间:2018-06-04 13:43
本文选题:骨髓间充质干细胞 + T淋巴细胞 ; 参考:《四川大学》2006年博士论文
【摘要】:目的 移植物抗宿主病(graft-versus-host disease,,GVHD)是异基因造血干细胞移植的主要并发症。供者T淋巴细胞识别宿主抗原提呈细胞携带异基因抗原片断,进一步活化并且分泌大量细胞因子,从而造成宿主的组织损伤。虽然许多标准的GVHD预防方案已经广泛应用于异基因造血干细胞移植术后,但重度的GVHD,尤其是激素难治型GVHD仍然严重威胁患者的生命。 aGVHD发生中的效应阶段包括体液免疫和细胞免疫两方面,即活化的T淋巴细胞释放大量的炎症因子,如TNF-α、IL-1等,同时自然杀伤细胞和细胞毒性淋巴细胞产生的细胞毒作用,两者共同作用造成了宿主的组织损伤。Ⅰ型T淋巴细胞分泌细胞因子如IL-2,IFNγ,这些炎症因子促使单核巨噬细胞活化,对炎症的形成起重要的作用,这些作用可以被Ⅱ型T细胞所分泌的免疫负调节细胞因子IL-4和IL-10所抑制。aGVHD的发生主要是以Ⅰ型T淋巴细胞产生的强烈的免疫反应,减少Ⅰ型T细胞的产生,增加Ⅱ型T细胞的比例,可以减低GVHD所导致的移植相关死亡率。活化的T淋巴细胞的迁移在GVHD发病机制中起了至
[Abstract]:Purpose Graft-versus-host disease (GVHD) is a major complication of allogeneic hematopoietic stem cell transplantation (HSCT). Donor T lymphocytes recognize host antigen-presenting cells carrying allogeneic antigen fragments and further activate and secrete a large number of cytokines resulting in host tissue damage. Although many standard prophylaxis of GVHD have been widely used after allogeneic hematopoietic stem cell transplantation, severe GVHD, especially steroid refractory GVHD, still pose a serious threat to the life of patients. The effect stages of aGVHD include humoral immunity and cellular immunity. The activated T lymphocytes release a large number of inflammatory factors, such as TNF- 伪, IL-1, and the cytotoxic effects of natural killer cells and cytotoxic lymphocytes. The cytokines secreted by T lymphocytes of type 鈪
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