Mechanisms and Interventions for Methamphetamine and HIV-1 Induced CNS Injury

甲基苯丙胺和 HIV-1 引起的中枢神经系统损伤的机制和干预措施

• 批准号: 7786992
• 负责人: Anuja Ghorpade
• 金额: $ 39.72万
• 依托单位: TEMPLE UNIV OF THE COMMONWEALTH
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7786992
• 关键词: 3-nitrotyrosine; AIDS Dementia Complex; Address; Adhesions; Agonist; American; Amino Acid Transporter; Animal Model; Animals; Anti-Inflammatory Agents; Anti-inflammatory; Antioxidants; Area; Astrocytes; Behavior; Biological; Biological Assay; Blood - brain barrier anatomy; Brain; CCR5 gene; CXCR4 gene; Cell Adhesion Molecules; Cell Survival; Cell physiology; Cells; Central Nervous System Infections; Cessation of life; Chronic; Clinical Research; Cocaine; Cognitive deficits; Consultations; Cytoskeleton; Data; Detection; Down-Regulation; Drug usage; Electrical Resistance; Encephalitis; Endothelial Cells; Endothelium; Excitatory Amino Acids; Figs - dietary; Functional disorder; Future; Generations; Genetic Transcription; Glutamate Transporter; Glutamates; Guanosine Triphosphate Phosphohydrolases; HIV; HIV-1; Health; Human; Immune; Immune response; Impaired cognition; Impairment; In Vitro; Individual; Infection; Inflammation Mediators; Injury; Intervention; Investigation; Label; Lead; Leukocytes; Levocarnitine Acetyl; Link; Magnetic Resonance Imaging; Measures; Mediating; Messenger RNA; Methamphetamine; Methamphetamine dependence; Modeling; Molecular Weight; Monomeric GTP-Binding Proteins; Mononuclear; Mus; Myosin Light Chain Kinase; NF-kappa B; NOD/SCID mouse; Nerve; Nerve Degeneration; Neuraxis; Neuroglia; Neuronal Injury; Neurons; Non obese; Outcome; Oxidative Stress; PPAR gamma; Pathogenesis; Pathway interactions; Peripheral Blood Lymphocyte; Permeability; Pharmaceutical Preparations; Phosphorylation; Play; Production; Property; Proteins; Reactive Oxygen Species; Reader; Reading; Regulation; Rewards; Risk; Role; Scheme; Secondary to; Signal Transduction; Specimen; Spinal Ganglia; Stimulus; Surveys; Testing; Therapeutic; Therapeutic Intervention; Tight Junctions; Time; Toxic effect; Tracer; Transcriptional Activation; Trolox; Tyrosine 3-Monooxygenase; Viral; Vitamin E; Water; Western Blotting; Work; adipocyte differentiation; analog; astrogliosis; base; brain tissue; central nervous system injury; chemokine; cognitive function; diabetic; excitotoxicity; extracellular; functional disability; immunocytochemistry; in vitro Assay; in vivo; inhibitor/antagonist; insight; insulin sensitivity; macrophage; methamphetamine abuse; methamphetamine exposure; methylxanthine; migration; monocyte; monolayer; nerve injury; neuroinflammation; neuropsychological; neurotoxic; neurotoxicity; novel; prevent; propentofylline; protective effect; protein expression; public health relevance; reconstitution; research study; response; stimulant abuse; therapeutic target; transcription factor; uptake

DESCRIPTION (provided by applicant): Methamphetamine (METH), an addictive stimulant has long lasting toxic effects on the central nervous system (CNS). Clinical studies indicated that METH dependence has an additive effect on neuropsychological deficits associated with HIV-1 infection. Oxidative stress, excitotoxicity, BBB impairment and glial cell activation, all have been independently implicated in the mechanisms of METH- and HIV-1-associated neurotoxicity. This proposal will investigate specific mechanisms operative in HIV-1 CNS infection and METH abuse that lead to an overall increase in oxidative stress and NF-kB signaling resulting in impairment of astrocytes and endothelial cell function. We propose that METH-mediated oxidative stress in astrocytes leads to a down regulation excitotoxic amino acid transporter (EAAT) -2, the primary astrocyte glutamate scavenger, while in endothelial cells, such an increase in oxidative stress results in loss of BBB integrity. Indeed, our preliminary data suggest that METH exposure caused ROS generation in astrocytes and human primary BMVEC, diminished EAAT-2 expression, in astrocytes, decreased BBB integrity in vitro that was restored by antioxidant treatment, caused decreased expression/re-distribution of tight junction proteins, enhanced adhesion and migration of monocytes across endothelial monolayers and activated small GTPases in BMVEC that were previously implicated in the BBB injury during HIV-1 encephalitis (HIVE). New preliminary data demonstrated increased permeability of BBB in vivo in animals exposed to METH that was prevented by antioxidant treatment. This proposal will investigate a novel concept of mechanistic commonality, i.e. METH-mediated oxidative stress exerts its cell-specific effects in astrocytes and endothelial cells aggravating injury caused by HIV-1 CNS infection and delineate therapeutic options for these targets using in vivo studies. Using a combination of in vitro assays and METH/HIVE animal model, we will address the following questions: What is the role(s) of enhanced reactive oxygen species, ROS production and NF-kB signaling in diminished expression/function of EAAT-2 in astrocytes? (Aim 1) What are underlying mechanisms of BBB dysfunction and enhanced monocyte adhesion/migration across brain endothelium (via oxidative stress, interference with NF-kB and GTPase signaling)? (Aim 2); and Can therapeutics decreasing oxidative stress and normalizing EAAT-2 function ameliorate BBB dysfunction and neurotoxicity in an animal model for HIVE and METH abuse? (Aim 3) We will address these questions utilizing primary human astrocytes and brain microvascular cells, in vitro BBB models and evaluate combined effects of METH and HIV-1 relevant stimuli on EAAT-2 and BBB function. Antioxidants and specific signaling inhibitors will be utilized to delineate pathways involved in these effects. Our HIVE animal model will be employed to investigate the biological outcomes of these cell-specific mechanisms in cognitive function, BBB damage and neurotoxicity. We believe that the proposed works are highly significant, as they will uncover novel mechanisms involved in the combined effects of HIV-1 and METH in the CNS and propose therapeutic approaches based on these investigations. PUBLIC HEALTH RELEVANCE: Methamphetamine, a highly addictive stimulant abused by millions of Americans has long lasting toxic effects on the central nervous system. Clinical studies indicated that methamphetamine dependence has an addictive effect on cognitive deficits associated with HIV-1 infection. Current proposal aims to understand mechanisms of combined effects of HIV-1 and methamphetamine in the brain and to propose neuroprotective therapies.

描述（由申请人提供）：甲基苯丙胺（METH）是一种成瘾性兴奋剂，对中枢神经系统（CNS）具有持久的毒性作用。临床研究表明，METH依赖对与HIV-1感染相关的神经心理缺陷具有累加效应。氧化应激、兴奋性毒性、血脑屏障损伤和神经胶质细胞活化均独立参与METH和HIV-1相关神经毒性的机制。该提案将研究HIV-1 CNS感染和METH滥用中的具体机制，这些机制导致氧化应激和NF-kB信号传导的总体增加，从而导致星形胶质细胞和内皮细胞功能受损。我们提出，在星形胶质细胞中，MET介导的氧化应激导致下调兴奋毒性氨基酸转运蛋白（EAAT）-2，主要的星形胶质细胞谷氨酸清除剂，而在内皮细胞中，这种氧化应激的增加导致血脑屏障完整性的损失。事实上，我们的初步数据表明，METH暴露导致星形胶质细胞和人原代BMVEC中ROS的产生，星形胶质细胞中EAAT-2表达减少，体外BBB完整性降低，通过抗氧化剂处理恢复，导致紧密连接蛋白的表达/再分布降低，增强单核细胞穿过内皮细胞单层的粘附和迁移，并激活BMVEC中先前与BBB有关的小GTP酶HIV-1脑炎（HIVE）。新的初步数据表明，通过抗氧化剂治疗，暴露于METH的动物体内血脑屏障通透性增加。该提案将调查一个新的概念，机制的共性，即甲基-介导的氧化应激发挥其细胞特异性的影响，在星形胶质细胞和内皮细胞加重损伤引起的HIV-1中枢神经系统感染，并描绘这些目标的治疗方案，使用体内研究。使用体外试验和METH/HIVE动物模型的组合，我们将解决以下问题：在星形胶质细胞中EAAT-2的表达/功能减弱中，活性氧物质、ROS产生和NF-κ B信号的增强在星形胶质细胞中的作用是什么？(Aim 1）BBB功能障碍和增强的单核细胞粘附/迁移穿过脑内皮的潜在机制是什么（通过氧化应激、干扰NF-kB和GT3信号传导）？(Aim 2）、降低氧化应激和使EAAT-2功能正常化的治疗剂能否改善HIVE和METH滥用动物模型中的BBB功能障碍和神经毒性？(Aim 3）我们将利用原代人星形胶质细胞和脑微血管细胞、体外BBB模型来解决这些问题，并评估METH和HIV-1相关刺激对EAAT-2和BBB功能的联合作用。抗氧化剂和特定的信号传导抑制剂将被用来描绘参与这些影响的途径。我们的HIVE动物模型将用于研究这些细胞特异性机制在认知功能，BBB损伤和神经毒性方面的生物学结果。我们认为，拟议的工作是非常重要的，因为他们将发现新的机制参与的HIV-1和METH在中枢神经系统的联合作用，并提出基于这些调查的治疗方法。公共卫生相关性：甲基苯丙胺是一种高度成瘾的兴奋剂，被数百万美国人滥用，对中枢神经系统有长期的毒性作用。临床研究表明，甲基苯丙胺依赖对与HIV-1感染相关的认知缺陷具有成瘾作用。目前的提案旨在了解HIV-1和甲基苯丙胺在大脑中的联合作用机制，并提出神经保护疗法。