Mechanisms of microglial neuroinflammatory response in glaucoma

青光眼小胶质细胞神经炎症反应机制

基本信息

批准号：
10717247
负责人：
Milica Margeta
金额：
$ 49.25万
依托单位：
SCHEPENS EYE RESEARCH INSTITUTE
依托单位国家：
美国
项目类别：
财政年份：
2023
资助国家：
美国
起止时间：
2023-09-01 至 2028-08-31
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/10717247
关键词：
Animal Model Animals Apolipoprotein E Apoptotic Aqueous Humor Autoimmune Autopsy Binding Blindness Brain Cause of Death Cell Culture Techniques Cell Death Cell Survival Cells Characteristics Complement Data Data Set Demyelinations Development Disease Eye Galectin 3 Genes Genetic Glaucoma Goals Human Immune Immunoglobulin Fragments In Vitro Inflammasome Inflammation Inflammatory Inflammatory Response Injections Interleukins Macrophage Mediating Mediator Membrane Mental Depression Microglia Microspheres Modeling Molecular Molecular Profiling Morbidity - disease rate Mus Myeloid Cells NR0B2 gene Nerve Degeneration Nervous System Neurodegenerative Disorders Neurons Optic Nerve PIK3CG gene PTPN11 gene Pathogenesis Patients Phenotype Phosphoric Monoester Hydrolases Physiologic Intraocular Pressure Play Prevalence Regulation Reporter Research Retina Retinal Ganglion Cells Risk Factors Role Signal Pathway Signal Transduction Therapeutic Up-Regulation Visual impairment Work apolipoprotein E-3 blind cell injury common treatment conditional knockout cytokine efficacy evaluation glial activation high intraocular pressure in vivo modifiable risk monocyte mouse model neuroinflammation neuron loss neuroprotection neutralizing antibody novel peripheral nerve regeneration pharmacologic phosphatidylserine receptor prevent receptor recruit response retinal ganglion cell degeneration sensor transcriptome sequencing translational approach

项目摘要

The goal of this proposal is to elucidate the role of microglia, the resident immune cells of the retina and the brain, in the pathogenesis of glaucoma. Glaucoma is the leading cause of irreversible blindness worldwide, whose hallmark is progressive loss of retinal ganglion cells (RGCs). In our prior work we have found that microglia in glaucoma upregulate a disease-associated molecular signature that is shared with brain neurodegenerations, and that genetic or pharmacologic targeting of molecules in this signaling pathway can prevent RGC loss in a mouse model of glaucoma. Furthermore, we have found that microglia activated by engulfment of apoptotic neurons can subsequently cause more RGC loss in the absence of high intraocular pressure (IOP), demonstrating that microglia can propagate neuronal damage in glaucoma. Using the RNAseq datasets from these studies, we have now identified the transmembrane receptor CD300lf as a key mediator of microglial inflammatory response in glaucoma. CD300lf is a phosphatidylserine receptor with dual activating and inhibitory capacity that can bind to damaged and apoptotic cells and, in the brain, is expressed only by myeloid cells. Our preliminary data demonstrate that 1) CD300lf is upregulated in retinal microglia from two mouse glaucoma models; 2) CD300lf–/– animals are protected from RGC loss in the microbead glaucoma model despite elevated IOP; and 3) unlike wildtype microglia, CD300lf–/– microglia do not upregulate inflammatory cytokines, including Il-1, in response to damaged/apoptotic neurons in vivo. Based on these data, we hypothesize that CD300lf is a key regulator of the microglial inflammatory response that exacerbates RGC loss in glaucoma. We will address this hypothesis with the following Specific Aims: 1. Determine if microglia are the key myeloid cell subpopulation that mediates CD300lf effect in glaucoma. In this aim, we will use CD300lffl/fl conditional knockouts to identify whether CD300lf harms RGCs by acting in microglia or other myeloid cell subpopulations (monocytes, border-associated macrophages). 2: Investigate the effect of targeting CD300lf and its binding partners on inflammasome signaling. We will evaluate the inflammatory response and the inflammasome function in myeloid cells deficient in CD300lf or its binding partners in cell culture and in vivo. 3: Investigate the therapeutic potential of targeting CD300lf in glaucoma. We will assess the efficacy of CD300lf neutralizing antibody fragment in protecting RGCs in a mouse model of glaucoma and evaluate if CD300LF is upregulated in human postmortem eyes with glaucoma. The research outlined in this proposal will define the role of CD300lf signaling in microglia in glaucoma, with the ultimate goal of developing novel neuroprotective treatments for this common blinding disease.

该提案的目的是阐明小胶质细胞的作用，视网膜的居民免疫球和大脑，在青光眼的发病机理中。青光眼是全球不可逆失明的主要原因，其标志是视网膜神经节细胞（RGC）的进行性丧失。在我们先前的工作中，我们发现青光眼中的小胶质细胞上调与大脑共享的疾病相关的分子特征神经退行性，以及该信号通路中分子的遗传或药理靶向防止青光眼小鼠模型中的RGC损失。此外，我们发现小胶质细胞激活凋亡神经元的吞噬随后会导致更多的RGC损失，而在没有高眼内的情况下压力（IOP），表明小胶质细胞可以传播青光眼中的神经元损伤。使用RNASEQ 来自这些研究的数据集，我们现在已经确定了跨膜接收器CD300LF是青光眼中的小胶质细胞炎症反应。 CD300LF是具有双重激活和可以与损伤和凋亡细胞结合的抑制能力，并且在大脑中仅由髓样表达细胞。我们的初步数据表明1）CD300LF在视网膜小胶质细胞中更新青光眼模型； 2）CD300LF - / - 动物受到Microbead青光眼模型目的地的RGC损失升高的IOP; 3）与野生型小胶质细胞不同，CD300LF - / - 小胶质细胞不上调炎症细胞因子，包括IL-1，响应体内损伤/凋亡神经元。基于这些数据，我们假设 CD300LF是小胶质细胞炎症反应的关键调节剂，这种反应加剧了青光眼中的RGC损失。我们将以以下特定目的解决这一假设： 1。确定小胶质细胞是否是介导CD300LF效应的关键髓样细胞亚群青光眼。在此目标中，我们将使用CD300LFL/FL条件敲除来确定CD300LF是否会损害RGCS 作用于小胶质细胞或其他髓样细胞亚群（单核细胞，边界相关巨噬细胞）。 2：研究靶向CD300LF及其结合伙伴对炎性体信号传导的影响。我们将评估缺乏CD300LF或它在细胞培养和体内的结合伴侣。 3：研究针对青光眼中CD300LF的治疗潜力。我们将评估 CD300LF中和抗体片段在保护小鼠青光眼模型中的RGC中，并评估是否是否 CD300LF在具有青光眼的人类验尸眼中更新。该提案中概述的研究将定义CD300LF信号在小胶质细胞中的作用为这种常见的盲目疾病开发新型神经保护疗法的最终目标。