权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Preventing Alzheimer's Disease Like Brain Pathology in HIV Infection by Targeting CCR5

通过靶向 CCR5 预防阿尔茨海默病，例如 HIV 感染中的脑病理学

基本信息

批准号：
10301369
负责人：
GEORGETTE D. KANMOGNE
金额：
$ 22.98万
依托单位：
UNIVERSITY OF NEBRASKA MEDICAL CENTER
依托单位国家：
美国
项目类别：
财政年份：
2020
资助国家：
美国
起止时间：
2020-12-01 至 2022-10-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10301369
关键词：
70-kDa Ribosomal Protein S6 Kinases AIDS/HIV problem Abeta clearance Abeta synthesis Acids Address Alzheimer like pathology Alzheimer&apos s Disease Amino Acids Amyloid beta-42 Amyloid beta-Protein Amyloid beta-Protein Precursor Animal Model Anti-Retroviral Agents Area Attention Autopsy Blood - brain barrier anatomy Brain Brain Pathology C-terminal CCL3 gene CCL4 gene CCR5 gene CDK5 gene Cell Line Cells Cognitive Complex Cyclic AMP-Dependent Protein Kinases Development Enzymes FDA approved Functional disorder Gliosis HIV HIV Infections HIV-1 Hippocampus (Brain)Human Impairment In Vitro Individual Infection Inflammatory Injury Interleukin-6 Lesion Leukocytes Mediating Metabolism Mus Neprilysin Nerve Degeneration Neuraxis Neurocognitive Deficit Neurofibrillary Tangles Neuronal Injury Neurons Pathology Pathway interactions Persons Phagocytosis Pharmaceutical Preparations Phosphorylation Phosphotransferases Plasma Play Production Proto-Oncogene Proteins c-akt RANTES RNA Research Priority Role Senile Plaques Speed Structure Testing Therapeutic Tissue Sample United States National Institutes of Health Viral Load result Viral Proteins Zidovudine alpha secretase amyloid formation amyloid precursor protein processing amyloidogenesis antagonist antiretroviral therapy beta secretase brain tissue central nervous system injury design in vivo information processing mouse model neurofibrillary tangle formation neuroinflammation neuron loss neurotoxic novel novel therapeutic intervention prevent protein metabolism public health relevance putamen secretase tau Proteins tau-1 therapeutic target upstream kinase vascular injury

项目摘要

ABSTRACT Studies of brain tissues from people living with HIV (PLWH), as well as HIV/AIDS animal models, showed increased amyloid-β (Aβ) production and aggregation, amyloid plaques, increased Tau hyperphosphorylation (pTau) and formation of neurofibrillary tangles-like structures. Importantly, the presence of these Alzheimer’s Disease (AD)-like pathologies in PLWH is associated with increased neurodegeneration and HIV-associated neurocognitive impairment (HAND). The mechanisms through which HIV increase Aβ production, pTau pathologies, and induce AD-like central nervous system (CNS) impairment are not known. Although most PLWH who showed increased CNS amyloid plaques and pTau associated with HAND had been on long-term antiretroviral therapy (ART), the role of ART in Aβ and pTau production, and AD-like pathologies has not been investigated. Our in-vivo and ex-vivo studies demonstrated that HIV-1 infection significantly increased CNS levels of Aβ42 (the major neurotoxic component of Aβ) and pTau, and this was associated with neuronal damage and blood-brain barrier (BBB) injury. Significantly, we demonstrated that the CCR5 antagonist, maraviroc (MVC), abrogated HIV-induced production of Aβ42 and pTau, prevented HIV-induced damage to neurons and the BBB, and decreased CNS viral loads. Therefore, we hypothesize that CCR5 plays a major role in the formation of amyloid plaques and pTau pathology in PLWH and that targeting CCR5 prevents HIV-induced Aβ production, prevents the formation of amyloid plaques and pTau, and abrogates neuronal loss, and HAND. In these exploratory studies, we will use a validated HIV/AIDS animal model to test this hypothesis and further investigate the effects of a commonly prescribed antiretroviral (ARV) drug (azidothymidine [AZT]) on HIV- 1-induced amyloidogenesis, pTau and CNS injury (Aim-1), neuroinflammation and Aβ clearance (Aim-2), the metabolism of amyloid precursor proteins (APP) and Tau (Aim-3). These mechanistic studies will help determine whether HIV induce Aβ production by interfering with i) Aβ degradation and clearance, ii) APP α-secretase or β- secretase pathways; iii) the effectors and pathways associated with HIV-induce pTau, iv) the role of ARV (AZT), and v) whether CCR5 modulates these effects. Studies in this R21 application are very significant and address the NIH high priority research areas that focus on “Examining the pathophysiologic mechanisms of HIV-induced CNS dysfunction in the setting of ART…. and development of novel therapeutic approaches to mitigate CNS complications of HIV infection.” The CCR5 antagonist MVC is an FDA-approved drug and our study will determine whether MVC prevents CNS Aβ production, formation of amyloid plaques and pTau in the setting of HIV-infection and ART, and the associated mechanisms. The results will demonstrate the role of CCR5 in HIV- induced production of Aβ and pTau in the CNS and provide new approaches for therapeutically targeting CCR5 to prevent HIV-1-induced amyloidogenesis, pTau pathology, neuronal injury, and neurocognitive impairments.

摘要