Antibody inhibition of respiratory syncytial virus G protein activity

呼吸道合胞病毒(RSV)是引起我国严重下呼吸道疾病的最主要原因。 婴儿和老年人。目前，还没有安全有效的RSV疫苗存在。我们的技术进步 对与RSV感染相关的免疫和疾病发病机制的了解揭示了RSV G蛋白包含一个CX3C趋化因子基序，它与CX3CR1趋化因子受体相互作用，修饰 CX3CL1的活性，并影响免疫和疾病发病机制的各个方面。G蛋白抗体 诱导对RSV疫苗的急性应答或自然感染抑制G蛋白CX3C-CX3CR1 相互作用；然而，目前尚不清楚抗G蛋白抗体反应是否能预防疾病的发生。 我们研究的长期目标是确定RSV G蛋白中诱导保护性 抗体反应阻断G蛋白CX3C-CX3CR1的相互作用为 开发安全有效的RSV候选疫苗。我们的中心假设是，对 消除CX3C基序的G蛋白可能会提高疫苗的安全性，同时诱导抗体 阻断这种相互作用可能会提高疫苗的效力。该提案将利用定义明确的CX3C 趋化因子结合和白细胞迁移分析，抗G蛋白单抗 G蛋白多肽和多肽，以及明确的小鼠模型。使用这些试剂，我们将检查 具体目的如下：1)确定G蛋白中产生阻断G的抗体的区域 蛋白CX3C与CX3CR1结合；2)确定阻断G蛋白CX3C结合的抗体的能力 CX3CR1抑制与呼吸道合胞病毒感染相关的肺部炎症反应，或福尔马林- 灭活(FI-RSV)疫苗增强型疾病；3)确定阻断 G蛋白与CX3CR1结合与人类呼吸道合胞病毒病的严重程度和白细胞迁移这个 拟议的研究具有创新性，因为它将识别RSV G蛋白中诱导抗体的区域 阻断RSV疾病，并提供与抑制相关的体液反应的关键信息 RSV G蛋白CX3C-CX3CR1相互作用预防疾病。

Respiratory syncytial virus (RSV) is the most important cause of severe lower respiratory tract illness in infants and the elderly. Currently, no safe and efficacious RSV vaccine exists. Advances in our understanding of immunity and disease pathogenesis associated with RSV infection have revealed that RSV G protein contains a CX3C chemokine motif that interacts with the CX3CR1 chemokine receptor, modifies the activities of CX3CL1, and affects aspects of immunity and disease pathogenesis. Antibodies to G protein induced in the acute response to RSV vaccination or natural infection inhibit G protein CX3C-CX3CR1 interaction; however, it is unclear if anti-G protein antibody responses protect from disease pathogenesis. The long-term goal of our research is to determine the regions in RSV G protein that induce a protective antibody response which block G protein CX3C-CX3CR1 interaction to provide the foundation for the development of safe and efficacious RSV vaccine candidates. Our central hypothesis is that modifications to the G protein which eliminate the CX3C motif may improve vaccine safety while induction of antibodies that block this interaction may improve vaccine efficacy. The proposal will take advantage of a well-defined CX3C chemokine binding and leukocyte migration assay, panels of anti-G protein monoclonal antibodies, panels of G protein peptides and polypeptides, and well-defined mouse model. Using these reagents we will examine the following specific aims: 1) Determine regions in the G protein that induce antibodies which block G protein CX3C binding to CX3CR1; 2) Determine the ability of antibodies that block G protein CX3C binding to CX3CR1 to inhibit the pulmonary inflammatory response associated with RSV infection, or formalin- inactivated (FI-RSV) vaccine enhanced disease; 3) Determine the association between antibodies that block G protein binding to CX3CR1 and leukocyte migration and severity of RSV disease in humans. The proposed research is innovative because it will identify regions in the RSV G protein that induce antibodies which block RSV disease, and provide critical information on humoral responses associated with inhibiting RSV G protein CX3C-CX3CR1 interaction to prevent disease.