Intercellular mechanisms of microglia activation in diet-induced obesity

这是一份管理补充申请（PA-18-591），以响应NOT-AG-20-034（以阿尔茨海默氏症为重点 美国国立卫生研究院赠款的行政补充，不集中在阿尔茨海默病），以我们正在进行的美国国立卫生研究院拨款 1 R 01 DK 120321 -03，标题为“饮食诱导肥胖症中小胶质细胞激活的细胞内机制”。这 该项目旨在揭示解偶联蛋白2（UCP 2）介导的线粒体动力学在小胶质细胞中的作用 激活能量稳态的中枢调节，以便开发更好的治疗策略 代谢紊乱，如肥胖和2型糖尿病。没有与阿尔茨海默病相关的研究 在这份赠款中提出。 作为对NOT-AG-20-034的回应，我们要求资金来检验UCP 2依赖性小胶质细胞 激活和神经炎症可能会影响阿尔茨海默病（AD）发展的开始， 通过影响组织学和行为学改变来建立AD遗传小鼠模型。我们的初步研究表明， 抑制暴露于HFD喂养的小鼠中的UCP 2依赖性小胶质细胞活化可预防神经炎症 （小胶质细胞增生），防止代谢紊乱的发展，如肥胖和2型糖尿病，以及 还可以防止与衰老和AD相关的行为和海马结构的变化。老化 和肥胖是神经退行性疾病如阿尔茨海默氏病发展的危险因素 (AD)，我们假设HFD诱导的UCP 2依赖性小胶质细胞活化在脑缺血发作中起作用。 AD的发展和这种机制的抑制，通过减少慢性神经炎症， 预防和/或延迟皮质和海马组织学和行为学变化的发生， AD. 因此，在本补充中，我们建议评估选择性和诱导性缺失UCP 2在小胶质细胞中的作用。 细胞对AD小鼠[5xFAD小鼠（B6. Cg-B6. Cg-B6. Cg）]的组织学和行为的影响。 Tg（APPSwFlLon，PSEN 1 * M146 L * L286 V）6799 Vas/MmH 2;奥克利H等人，2006）]暴露于任一标准 在不同的时间点用普通饲料或HFD。将使用几只同窝小鼠作为对照。男性和女性 将对小鼠进行研究。将在不同时间点进行行为和组织学研究，以评估 在该AD小鼠模型中，小胶质细胞在AD发生中的作用。这些研究的执行将 为小胶质细胞和代谢在AD中的作用提供了新的见解。

This is an administrative supplement request (PA-18-591) in response to NOT-AG-20-034 (Alzheimer's -focused Administrative supplements for NIH grants that are not focused on Alzheimer's disease) to our ongoing NIH grant 1R01DK120321-03 entitled “Intracellular mechanisms of microglia activation in diet-induced obesity”. This project aims to unmask the role of uncoupling protein 2 (UCP2)-mediated mitochondrial dynamics in microglia activation in the central regulation of energy homeostasis in order to develop better strategies for the treatment of metabolic disorders, such as obesity and type 2 diabetes. There are no Alzheimer’s Disease-related studies proposed in this grant. In response to NOT-AG-20-034, we request funds to test the hypothesis that UCP2-dependent microglia activation and neuroinflammation may impact the onset of the development of Alzheimer’s disease (AD) in genetic mouse model of AD by affecting histological and behavioral changes. Our preliminary studies show that inhibiting UCP2-dependent microglia activation in mice exposed to HFD feeding prevents neuroinflammation (microgliosis), protects from the development of metabolic disorders, such as obesity and type 2 diabetes, and also prevents changes in behaviors and hippocampal structure that are associated with aging and AD. As aging and obesity are risk factors for the development of neurodegenerative disorders such as Alzheimer’s disease (AD), we hypothesize that HFD-induced UCP2-dependent microglia activation plays a role in the onset of the development of AD and inhibition of this mechanism, by reducing chronic neuroinflammation, prevents and/or delays the onset of cortical and hippocampal histological and behavioral changes in AD. Thus, in this supplement we propose to assess the effect of selective and inducible deletion of UCP2 in microglial cells on the histology and behavior of AD mice [5xFAD mice (B6.Cg- Tg(APPSwFlLon,PSEN1*M146L*L286V)6799Vas/Mmjax; Oakley H et al., 2006)] exposed to either standard chow diet or HFD, at different time points. Several littermate mice will be used as controls. Both male and female mice will be studied. Behavioral and histological studies will be performed at different time points to assess the role of microglia in the onset of AD development in this AD mouse model. The execution of these studies will deliver novel insights into the role of microglia and metabolism in AD.