Molecular imaging using hyperpolarized carbon-13

使用超极化碳 13 进行分子成像

• 批准号: 7079132
• 负责人: STEPHEN J KADLECEK
• 金额: $ 17.9万
• 依托单位: UNIVERSITY OF PENNSYLVANIA
• 依托单位国家: 美国
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-04-18 至 2008-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7079132
• 关键词: amidohydrolases; blood; carbon; catalyst; cell line; conditioning; diagnosis; liver cells; magnetism; metabolism; molecular /cellular imaging; organic acid; protonation; radionuclides; relaxation; succinates

DESCRIPTION (provided by applicant): Molecular imaging has been defined as "the visualization in space and time of normal and abnormal cellular processes at the level of molecular or genetic function". In this project, we plan to develop a new variety of MRI that utilizes magnetically labeled molecular probes, and demonstrate its use in studies of molecular events with applications to cancer diagnosis and treatment. Associated with this labeling is a signal enhancement of a few orders of magnitude (10 to 105) that increases the sensitivity of 1H-MRI. Furthermore, upon transfer of the initial proton polarization to other nuclei (e.g., 15N, 19F, 31P, or in this case 13C), the corresponding sensitivity increases significantly expand the applicability and utility of emerging hetero-MRI techniques. In particular, events become detectable at much lower concentration, shorter timescale, and with greater spatial resolution. We will take advantage of the Parahydrogen-Induced Polarization phenomenon known from NMR spectroscopy to generate specific hyperpolarized target molecules, chosen for their slow relaxation to the unlabeled state and an unambiguous signaling (through change in resonance frequency) of an important biological event. Preliminary results have demonstrated the feasibility of polarizing 13C in the biologically important class of small organic acids. We propose to extend this work by focusing on 2-succinate and 4-phenylbutyrate. These molecules display favorable relaxation and biological tolerance properties, rapid metabolism, and clear applicability to oncology research and diagnosis. Additionally, despite extensive in vitro and in vivo studies of both compounds, important gaps remain in our current understanding that may be elucidated through application of these techniques. The planned work consists of modifying existing equipment to consistently achieve a high degree of magnetic labeling, and measuring metabolism and other bioactivity in cell cultures. This effort also lays the ground work for planned in vivo studies by measuring magnetic interactions with blood and tissue components. Key Words: Polarized Carbon-13 MRI; Metabolic imaging; Molecular imaging.

描述（由申请人提供）：分子成像已被定义为“在分子或遗传功能水平上正常和异常细胞过程的空间和异常细胞过程中的可视化”。在这个项目中，我们计划开发一种新的MRI，该MRI利用磁性标记的分子探针，并证明其在用于癌症诊断和治疗的分子事件研究中的使用。与此标记相关的是一些数量级的信号增强（10至105），从而提高了1H-MRI的灵敏度。此外，在将初始质子极化转移到其他核（例如15n，19f，31p或在这种情况下为13C）后，相应的灵敏度显着提高了新兴的异氧化物MRI技术的适用性和实用性。特别是，在较低的时间尺度和更大的空间分辨率下，可检测到的事件可以检测到。我们将利用NMR光谱已知的偏二二氢诱导的极化现象来产生特定的超极化靶分子，该靶标分子是为了缓慢放松到未标记的状态，以及一个重要生物学事件的明确信号传导（通过复位频率）。初步结果表明，在生物学上重要的小有机酸类别中极化13C的可行性。我们建议通过专注于2-核酸盐和4-苯基丁酯来扩展这项工作。这些分子表现出有利的放松和生物耐受的特性，快速代谢以及对肿瘤学研究和诊断的明显适用性。此外，尽管对两种化合物的体外和体内研究进行了广泛的研究，但我们目前的理解仍然存在重要差距，这些差距可以通过应用这些技术来阐明。计划的工作包括修改现有设备以始终获得高度的磁性标记，并测量细胞培养物中的代谢和其他生物活性。这项工作还通过测量与血液和组织成分的磁相互作用来为计划的体内研究奠定了基础。关键词：偏振碳13 MRI；代谢成像；分子成像。