Imaging Biomarkers of Neurotoxicity in Welders

焊工神经毒性的成像生物标志物

• 批准号: 8917323
• 负责人: Brad A Racette
• 金额: $ 16.61万
• 依托单位: WASHINGTON UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-12-06 至 2017-10-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8917323
• 关键词: Adult; Affect; Age; Air; Basal Ganglia; Binding; Biological Markers; Brain; Brain region; Carboxy-Lyases; Child; Chronic; Clinical assessments; Communities; Corpus striatum structure; Data; Dopa; Dopamine; Dopamine D2 Receptor; Dose; Environment; Environmental Health; Epidemiology; Exposure to; Financial compensation; Functional disorder; Funding; Future; Gender; Goals; Grant; Hazardous Substances; Health; Health Hazards; High Prevalence; Human; Image; Institution; Investigation; Ligands; Magnetic Resonance Imaging; Manganese; Measures; Mediating; Metals; Methods; Molecular; National Institute of Environmental Health Sciences; Neuraxis; Neurologic; Neurologic Effect; Neurons; Neurotoxins; Occupational Health; Parkinson Disease; Parkinsonian Disorders; Positron-Emission Tomography; Publishing; Research Personnel; Research Project Grants; Role; Scanning; Soil; Synapses; System; Techniques; Time; Water; Welding; base; career; cohort; dihydrotetrabenazine; dopamine system; dopaminergic neuron; imaging modality; in vivo; molecular imaging; neurotoxicity; pet animal; postsynaptic; presynaptic; putamen; radioligand; receptor; response; uptake; vesicular monoamine transporter

DESCRIPTION (provided by applicant): Manganese (Mn) is a neurotoxicant that is present in soil, air, and water. Investigations of occupationally- exposed groups, such as welders, provide an ideal opportunity to characterize dose-related dopaminergic system damage associated with Mn. Recent studies from our collaborating institutions demonstrate a high prevalence of Parkinsonism in workers with chronic exposure to Mn containing welding fumes and dopaminergic dysfunction on [18F] fluorodopa (FDOPA) PET. This study utilizes an established, well characterized cohort of welders with detailed exposure and clinical assessments, developed through NIEHS funded research projects. For this proposal, a cohort of 40 career welders with baseline FDOPA PET scans will undergo repeat PET imaging of the nigrostriatal dopamine system using FDOPA and first time imaging with the presynaptic dopaminergic radioligand [11C]dihydrotetrabenazine (DTBZ) and the post-synaptic dopamine D2 receptor selective radioligand [11C]N-methylbenperidol (NMB). These workers will be compared to a second group of non-welder reference subjects who will be imaged at baseline and four years. The specific goals of this project are: 1) to investigate progression of dopaminergic dysfunction in welding exposed workers as evidence of progressive neurotoxicity, 2) to use the radioligand DTBZ to investigate the dose-response relationship with welding fume exposure as an indicator of the underlying etiologic relationship between Mn and damage to the presynaptic dopaminergic system, and 3) to use the radioligand NMB to investigate the dose-response relationship with welding fume exposure as an indicator of the underlying etiologic relationship between Mn and damage to the postsynaptic dopamine system. This proposal uses state-of-the-art imaging methods to investigate the health effects of a common environmental and occupational health hazard. The results of this study will have broad implications for public and worker health worldwide and will inform future community based studies of metal neurotoxicity. In addition, this study, in conjunction with our previously published data, will provide converging evidence of the role of Mn as a nigrostriatal neurotoxin. The methods described in this application represent cutting edge molecular and MRI techniques and the institutions and investigators are ideally suited for this unique epidemiology and imaging proposal.

描述（由申请人提供）：锰（Mn）是一种神经毒性物质，存在于土壤、空气和水中。对职业暴露群体（如焊工）的调查为表征与锰相关的剂量相关多巴胺能系统损伤提供了理想的机会。我们的合作机构最近的研究表明，在长期暴露于含锰焊接烟雾和多巴胺能功能障碍的工人中，帕金森病的患病率很高。这项研究利用了一个建立的，良好的特征队列的焊工详细的暴露和临床评估，通过NIEHS资助的研究项目开发。对于该提议，一组40名具有基线FDOPA PET扫描的职业焊工将使用FDOPA进行黑质纹状体多巴胺系统的重复PET成像，并使用突触前多巴胺能放射性配体[11 C]二氢丁苯那嗪（DTBZ）和突触后多巴胺D2受体选择性放射性配体[11 C] N-甲基苯哌利多（NMB）进行首次成像。这些工人将与第二组非焊工参考受试者进行比较，这些受试者将在基线和四年内进行成像。该项目的具体目标是：1）研究焊接工人多巴胺能功能障碍的进展作为进行性神经毒性的证据，2）使用放射性配体DTBZ研究与焊接烟雾暴露的剂量-反应关系，作为Mn与突触前多巴胺能系统损伤之间潜在病因学关系的指标，（3）用放射性配体NMB研究焊烟暴露的剂量-反应关系，作为Mn与突触后多巴胺系统损伤之间潜在病因学关系的指标。该提案使用最先进的成像方法来调查常见的环境和职业健康危害对健康的影响。这项研究的结果将对全世界的公众和工人健康产生广泛的影响，并将为未来基于社区的金属神经毒性研究提供信息。此外，这项研究，结合我们以前发表的数据，将提供融合 锰作为黑质纹状体神经毒素的作用的证据。本申请中描述的方法代表了最前沿的分子和MRI技术，机构和研究人员非常适合这种独特的流行病学和成像建议。