MANGANESE ENHANCED MRI: NON-INVASIVE MEASURE OF PATHOGENESIS OF DYSTROPHINOPATHY

锰增强 MRI：肌营养不良症发病机制的非侵入性测量

• 批准号: 8845276
• 负责人: ROBIA G PAUTLER
• 金额: $ 19.56万
• 依托单位: BAYLOR COLLEGE OF MEDICINE
• 依托单位国家: 美国
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-05-15 至 2017-04-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8845276
• 关键词: 12 year old; Age; Animals; Biodistribution; Biological Assay; Birth; Brain region; Buffers; Calcium; Cell Nucleus; Cells; Cessation of life; Child; Child Development; Clinical Trials; Connective Tissue; Contrast Media; Cytoskeletal Proteins; Data; Data Set; Deposition; Development; Diffusion Magnetic Resonance Imaging; Disease; Disease Progression; Duchenne muscular dystrophy; Dystrophin; Edema; Effectiveness; Evaluation; Event; Gadolinium DTPA; Genes; Genetic; Goals; Health; Heart; Heart failure; Hematoxylin and Eosin Staining Method; Histopathology; Image; Imaging Techniques; Incidence; Ions; Length; Life; Link; Magnetic Resonance Imaging; Manganese; Maps; Measurement; Measures; Mechanical Stress; Membrane; Methods; Modeling; Muscle; Muscle Fibers; Muscle Weakness; Muscle function; Muscular Dystrophies; Natural regeneration; Open Reading Frames; Outcome; Pathogenesis; Patients; Permeability; Phenotype; Predisposition; Process; Research; Role; Rupture; Skeletal Muscle; Staging; Staining method; Stains; Stretching; Structure; System; Testing; Therapeutic; Time; Wasting Syndrome; Work; base; disease-causing mutation; experience; gene therapy; in vivo; innovation; insight; interest; intravenous injection; male; manganese chloride; mdx mouse; mouse model; muscular structure; non-invasive imaging; novel; respiratory; tool

DESCRIPTION (provided by applicant): Duchenne muscular dystrophy (DMD) is the most devastating type of muscular dystrophy, with an incidence of 1 in every 3500 males. DMD is an X-linked, muscle-wasting disease caused by mutations in the cytoskeletal protein dystrophin.. Young DMD patients experience muscle damage that is followed by regeneration; however, as the disease progresses regeneration is impeded and muscle fibers are progressively replaced by connective tissue and fatty deposits. Profound muscle weakness results in decreased mobility by 10 to 12 year of age and eventually death by the age of 20 to 30 due to respiratory and/or cardiac failure. While there is currently no treatment for the disease, many different therapeutic approaches for DMD are entering clinical trials. Based on the trajectory of the pathogenic phenotype precise and reliable non-invasive measures that follow the temporal progression of the dystrophic process in children are needed., The goal of this proposal is to develop and validate a novel MRI technique (manganese enhanced MRI, MEMRI) as a noninvasive imaging procedure to assess skeletal muscle function in muscular dystrophy. The Specific Aims of the proposed research are to: 1) establish the biodistribution of Mn2+ within skeletal muscle after intravenous injection, and 2) establish a robust method using MEMRI for assessment of structural/functional changes in dystrophic skeletal muscle. If successful, the proposed research will provide a robust non- invasive method currently not employed for assessing both structure and function of skeletal muscle in DMD, which will be critical in evaluating the beneficial effects of these therapies.

描述（由申请人提供）：杜氏肌营养不良症 (DMD) 是最具破坏性的肌营养不良症类型，每 3500 名男性中就有 1 人发病。 DMD 是一种 X 连锁的肌肉萎缩疾病，由细胞骨架蛋白肌营养不良蛋白突变引起。年轻的 DMD 患者会经历肌肉损伤，随后出现再生；然而，随着疾病的进展，再生受到阻碍，肌肉纤维逐渐被结缔组织和脂肪沉积物取代。严重的肌肉无力会导致 10 至 12 岁时活动能力下降，并最终在 20 至 30 岁时因呼吸和/或心力衰竭而死亡。虽然目前还没有治疗这种疾病的方法，但许多不同的 DMD 治疗方法正在进入临床试验。根据致病表型的轨迹，需要精确可靠的非侵入性措施来跟踪儿童营养不良过程的时间进展。本提案的目标是开发和验证一种新型 MRI 技术（锰增强 MRI、MEMRI ）作为一种无创成像程序来评估肌营养不良症中的骨骼肌功能。该研究的具体目标是：1) 确定静脉注射后 Mn2+ 在骨骼肌内的生物分布，2) 建立一种使用 MEMRI 评估营养不良骨骼肌结构/功能变化的稳健方法。如果成功，拟议的研究将提供一种目前尚未用于评估 DMD 骨骼肌结构和功能的稳健非侵入性方法，这对于评估这些疗法的有益效果至关重要。