Modulation of IgG blood-brain barrier permeability by surface-accessible glycan moieties

 描述（由申请方提供）：在此，我们将检验IgG抗体血脑屏障渗透性将随表面唾液酸水平升高而增加的假设。增加抗体的血脑屏障渗透性是重要的，因为用于阿尔茨海默病和其他神经退行性疾病的抗体药物在施用后大部分保留在脑外。增加大脑中的抗体浓度将有助于抗体进入其主要治疗靶点，也可能进入新的免疫途径，使患者受益。该项目由两个目标组成，每个目标解决以下问题：（1）添加IgG唾液酸后，平均IgG血脑屏障通透性是否增加？(2)唾液酸化IgG的血脑屏障通透性是否高于去唾液酸化IgG？这两个目标都将使用体外血脑屏障模型，以确保在没有其他流入和流出途径的情况下测量血脑屏障通透性。目的1使用标准放射性标记方法进行IgG检测。目的2使用聚糖特异性表面等离子体共振方法来特异性地追踪具有表面暴露的唾液酸或半乳糖部分的IgG。对这一假说的支持将为阿尔茨海默病和其他中枢神经系统疾病的抗体治疗开辟新的途径。

 DESCRIPTION (provided by applicant): Here, we will test the hypothesis that IgG antibody blood-brain barrier permeability will increase in response to elevated surface sialic acid levels. Increasing the blood-brain barrier permeability of antibodies is important because antibody drugs for Alzheimer's Disease and other neurodegenerative disorders remain largely outside the brain after administration. Increasing antibody concentrations in the brain will help the antibodies access their primary therapeutic targets and may also tap into new immune pathways that benefit patients. The project consists of two aims that each address a question below: (1) Does the average IgG blood-brain barrier permeability increase upon addition of IgG sialic acid? (2) Is the blood-brain barrier permeability specific for sialylated IgG higher than fo desiaylated IgG? Both aims will use in vitro blood-brain barrier models to ensure that blood-brain barrier permeability is measured in the absence of other influx and efflux pathways. Aim 1 uses a standard radiolabelling methodology for IgG detection. Aim 2 uses a glycan-specific Surface Plasmon Resonance method to specifically track IgG with surface exposed sialic acid or galactose moieties. Support for this hypothesis will open new avenues for antibody treatment of Alzheimer's Disease and other diseases of the central nervous system.