NOVEL MRI METHODS FOR NEURONAL LOSS & IRON QUANTIFICATION IN PARKINSONS DISEASE

治疗神经元丢失的新 MRI 方法

• 批准号: 8170461
• 负责人: SHALOM MICHAELI
• 金额: $ 2.57万
• 依托单位: UNIVERSITY OF MINNESOTA
• 依托单位国家: 美国
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-06-01 至 2011-05-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8170461
• 关键词: Address; American; Biological; Biological Markers; Clinical Trials; Computer Retrieval of Information on Scientific Projects Database; Cross-Sectional Studies; Data; Diagnostic; Disease; Dopamine; Early Diagnosis; Emission-Computed Tomography; Environment; Funding; Goals; Grant; Imaging Techniques; Individual; Institution; Iron; Magnetic Resonance Imaging; Magnetism; Measurement; Measures; Methods; Neurodegenerative Disorders; Neurons; Parkinson Disease; Pathogenesis; Photons; Positron-Emission Tomography; Predisposition; Process; Proteins; Protons; Research; Research Personnel; Resources; Sensitivity and Specificity; Severity of illness; Source; Surrogate Endpoint; Techniques; Time; Tremor; United States National Institutes of Health; Water; density; disorder control; imaging modality; neuroimaging; neuron loss; novel; response; tool; water diffusion

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Parkinson's disease (PD) is a neurodegenerative disorder characterized by slowness, stiffness and often tremor. Over 1 million Americans have PD and globally 9 million people are projected to have PD by the year 2030. To date, there is no accepted objective biological measure, i.e, biomarker, that is reflective of disease pathogenesis or of pharmacological responses to treatment. Absence of a reliable biomarker severely limits early diagnosis, research on neuroprotective therapies and appreciation of disease pathogenesis. Current radiotracing imaging techniques such as positron emission tomography (PET) and single photon emission computed tomography (SPECT) lack the ability to ascertain dopamine neuronal counts as well as density. Additionally, there is insufficient supportive data to allow their use as diagnostic tools or as surrogate endpoints in clinical trials. Likewise, magnetic resonance imaging (MRI) in its present state is not useful as a biomarker for PD. Therefore, there remains a need for a PD neuroimaging technique that provides a means to measure neuronal viability and density as well as address other issues of which present imaging techniques are unable to do. A method which could ascertain neuronal status as well as possible pathogenic factors such as iron would be potentially useful. This proposal is a step in the process of evaluating the research utility of two novel magnetic resonance imaging (MRI) techniques T1¿ and T2¿, which may reflect the quantities of neurons and iron, respectively. T2¿ is sensitive to diffusion of water protons in environments with different local magnetic susceptibilities and likely reflects iron content; whileT1¿ reflects predominantly water-protein interactions, and, therefore might provide an indication of neuronal loss that could be used to assess PD nigral degeneration. At this time, it is not our intent to establish T1¿ and T2¿ as biomarkers or to determine their sensitivity/specificity as diagnostic tools. Our objective is to validate several aspects of T1¿ and T2¿. We will perform a cross-sectional study of PD and control subjects using a 4 Tesla scanner and obtain SN T1¿ and T2¿ MRI measurements. Our goals are to validate T1¿ and T2¿ in their ability to separate individuals with PD from control subjects, and to determine the ability of T1¿ and T2¿ to evaluate disease severity of PD.

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