11抗原提呈细胞与抗原的处理及提呈.ppt
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1、抗原提呈细胞(antigen-presenting cell,APC),概念,指能捕捉、加工、处理抗原,并将抗原信息提呈给抗原特异性T淋巴细胞的一类免疫细胞。,专职抗原提呈细胞(professional APC):,内皮细胞纤维母细胞上皮细胞病毒感染的细胞肿瘤细胞,Dendritic cellsMacrophagesB cells,兼职抗原提呈细胞,抗原提呈细胞(antigen-presenting cell,APC),抗原提呈细胞(antigen-presenting cell,APC),抗原提呈细胞(antigen-presenting cell,APC),抗原提呈细胞(antigen-p
2、resenting cell,APC),概念,up-taking of antigen processing of antigen presenting of peptide,class II MHC molecules peptidenaive CD4 Th cells.,class I MHC molecules peptidenaive CD8 T cells.,第一节 抗原提呈细胞的种类与特点,Dendritic cells are the most effective of the antigen-presenting cells.Because these cells consti
3、tutively express a high level of class II MHC molecules and costimulatory molecules,they can activate naive T cells.,Macrophages must be activated by phagocytoses of micro-organisms before they express class II MHC molecules or the co-stimulatory B7 membrane molecule.,B cells constitutively express
4、class II MHC molecules but must be activated before they express the costimulatory B7 molecule.,Dendritic cells,表面标志,高表达 MHC II 类分子 CD1a、CD11c、共刺激分子:CD80、CD86 黏附分子:CD40、CD54,细胞膜向外伸出许多很长的树状突起1973,Steinmam(JEM),第一节 抗原提呈细胞的种类与特点,Dendritic cells,来源、组织分布与分类,Lymphoid DC,myeloid DC,第一节 抗原提呈细胞的种类与特点,DC subs
5、ets,Plasmacytoid DC TLR7,TLR9 sense DNA/RNA virus IFN,Conventional DC Migratory DC Langerhans cell,Dermal DC,mucosal DC,Interstitial DC Lymphoid resident DC Thymic DC,Splenic DCConventional DC Immature DC Mature DC,DC在捕获抗原过程、接受抗原的刺激中,逐步成熟;,迁移与成熟的动态过程,Dendritic cells,伴随成熟过程中,DC从非淋巴组织迁移到次级淋巴器官,从而激发T细胞
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