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个性化和肌肉特定的OXPHOS测量与集成的CRCESTMRI和质子MR光谱学

Ryan R Armbruster¹, Dushyant Kumar¹, Blake Benyard¹

¹Department of Radiology, Center for Advanced Metabolic Imaging in Precision Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA.

Nature communications

|June 25, 2024

概括

这项研究引入了一种新的MRI方法,它结合了肌酸化学交换和转移 (CrCEST) 和肉氨酸光谱,通过计算运动期间的pH值变化来准确测量肌肉氧化酸化 (OXPHOS).

科学领域:

生物医学工程生物医学工程
代谢成像 - 代谢成像
肌肉生理学肌肉生理学

背景情况:

肌酸化学交换和转移 (CrCEST) MRI是一种评估肌肉氧化酸化 (OXPHOS) 的非侵入性技术.
CrCEST测量对肌肉pH值变化敏感,可能会混肌酸恢复时间 (τ_Cr) 的解释.
对运动刺激的个体反应导致可变的肌肉酸化,影响t_Cr.

研究的目的:

开发一种测量肌肉pH值及其对高时分辨率CRCESTMRI的影响的方法.
为了建立标准化的轻度和中度/强度运动刺激,使用肉1H-磁共振光谱 (MRS) 和3D CrCEST.
在不同的运动条件下,研究 CrCEST 恢复时间与 pH 的依赖性.

主要方法:

卡诺辛H-MRS和3D CrCEST MRI的整合.
应用不同的"轻度"和"中度/强度"运动刺激.
测试pH值变化与CrCEST恢复时间之间的关系.

主要成果:

证明了一个全面的代谢成像协议的可行性.
量化了pH对CRCEST衍生的t_Cr的影响.
建立了个性化OXPHOS评估的方法.

结论:

开发的协议通过纠正pH值变化,使准确的,肌肉特定的OXPHOS测量成为可能.
这种方法对研究健康衰老和影响肌肉线粒体的疾病有价值.
使用CrCEST和MRS进行个性化代谢成像可以促进我们对肌肉功能的理解.

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