Microglia antigen presentation in the CNS of Alzheimer's disease

PI：Bradshaw，Elizabeth M.，博士和Wassim Elyaman博士 标题：阿尔茨海默病CNS中的小胶质细胞抗原呈递 项目总结/摘要 阿尔茨海默病（Alzheimer's disease，AD）是一种与年龄相关的神经退行性疾病，以进行性认知功能障碍为特征 衰退和痴呆。全基因组关联研究已经确定了新的AD易感基因座。 有趣的是，这些基因座中的一些相关基因暗示了晚发性AD的免疫系统 在一些实施方案中，所述抗原包括人白细胞抗原（HLA）区，其与人白细胞抗原（LOAD），特别是先天免疫系统，包括人白细胞抗原（HLA）区相关。的 HLA区域与LOAD基因相关的发现进一步强调了如何 小胶质细胞是中枢神经系统（CNS）的抗原呈递细胞，与浸润性T细胞相互作用， 在AD患者的海马体中观察到的，特别是哪些抗原被 提出了与此同时，病原体假说已经获得了更多的支持，一个可能的致病病因 的AD。我们建议利用我们对免疫系统的理解， 技术和获得AD患者的血液和大脑尸检，以确定这些神经侵入性病原体是否 在AD中具有神经毒性。对于这种应用，我们提出了一种多方面的方法：1）识别肽 由AD脑中高T细胞浸润区域和低T细胞浸润区域中的小胶质细胞的MHC呈递， 细胞浸润; 2）检测AD中浸润海马的T细胞的抗原反应性和表型， 和3）确定小胶质细胞如何作为病原体的抗原呈递细胞向浸润性T细胞发挥作用。

PIs: Bradshaw, Elizabeth M., Ph.D. and Wassim Elyaman, Ph.D. Title: Microglia antigen presentation in the CNS of Alzheimer's disease Project Summary/Abstract Alzheimer's disease (AD) is an age-related neurodegenerative disease characterized by progressive cognitive decline and dementia. Genome-wide association studies have identified novel AD susceptibility loci. Interestingly the associated genes at several of these loci implicate the immune system in late-onset AD (LOAD), specifically the innate immune system, including the human leukocyte antigen (HLA) region. The finding of the HLA region being genetically associated with LOAD further emphasizes the question of how microglia, the antigen-presenting cells of the central nervous system (CNS), interact with infiltrating T cells, which have been observed in the hippocampus of AD patients, and specifically what antigens are being presented. In parallel, the pathogen hypothesis has garnered more support for a possible pathogenic etiology of AD. We propose to leverage our understanding of the immune system combined with cutting-edge technology and access to AD patient blood and brain autopsies to determine if these neuroinvasive pathogens are neurovirulent in AD. For this application, we propose a multifaceted approach to: 1) identify the peptides being presented by the MHC of microglia in the AD brain in regions of high T cell infiltration and areas of low T cell infiltration; 2) examine the antigen reactivity and phenotype of T cells infiltrating the hippocampus in AD, and 3) determine how microglia function as antigen-presenting cells of pathogens to infiltrating T cells.