Antigen-specific Memory CD4+T cells are required for antibody access to neuronal tissues α4-Integrin-dependent recruitment of memory CD4+T cells is required for antibody access to neuronal tissues 三种人工感染方式 intranasal circulating memory T-cell pool intraperitoneal Intravaginal TRM TRM circulating memory T-cell pool 三种感染方式的生存曲线、临床评分、病 毒滴定度 Intranasal immunization confers B-celldependent neuron protection following genital HSV-2 challenge overview • 以脊髓定位的病毒和脑定位病毒为实验材料 • 阐明了在病毒感染情况下,抗体通过血脑屏障和血神经屏障进入 大脑和脊髓的机制 • 需要memory CD4 T cell,interferon-γ,a4-integrin 实验材料介绍 HSV-2疱疹病毒 TK- HSV-2 Chromatin control of herpes simplex virus lytic and latent infection, David M. Knipe and Anna Cliffe,NATURE Review microbiology,2 0 0 8 为什么DRG病毒都被清除而脊髓里的病毒 数量却不稳定? • 与病毒进入路线有关? Memory CD4+T cells are required for antibody access to neuronal tissues depletion of CD4 or IFN-γ blockade had no significant impact on the serum levels of antiHSV-2 or total antibodies 与FcRn有关?无关! ? FcRn: the neonatal Fc receptor comes of age,Derry C. Roopenian* and Shreeram Akilesh,NATURE REVIEWS immunology,2007 ! Antibody-mediated neuroprotection depends on CD4 T cells • CD4 T 细胞通过a4 integrin介导 进入神经组织 • 分泌IFN-γ增加通透性 • 增加VCAM-1表达促使更多CD4 T细胞进入 免疫系统对抗脑定位病毒感染的机制 • VSV水泡性口 炎病毒 brain serum 工作意义 • 阐明机制: memory CD4 T cell,antibody,抗原呈递,趋化因子, a4-integrin,interferon-γ, VCAM-1。。。——FcRn? • Hale Waihona Puke Baidu选标准问题? 关于CD4 T cell进入神经组织途径更直观的 证据 • CD31存在于血小板、中性粒细胞、单核细胞 和某些类型的T细胞表面,以及内皮细胞间紧 密连接处。 Anti-a4后DRG和SC内的抗体检测 antibody access to the neuronal tissues mediated by CD4 T cells and IFN-γ is through increased vascular permeability IFN-γ is sufficient to induce both vascular and epithelial permeability in peripheral tissues IFN-γ is sufficient to enhance VCAM-1 expression on endothelial cells • 脑/神经靶向药物递送?对比现有:聚焦超声,纳米粒子(吸附介 导,受体介导),鼻腔给药 • 自身免疫疾病治疗:慢性炎症性脱髓鞘性多发性神经病,吉兰-巴 雷综合征 Proinflammatory cytokine-induced tight junction remodeling through dynamic self-assembly of claudinsChristopher ,T. Capaldo, Attila E. Farkas, Roland S. HilgarthA,Molecular Biology of the Cell,2014