缺血性中风后皮质糖酵解和线粒体代谢的相位依赖性改变评估
Assessment of Phase-Dependent Alterations in Cortical Glycolytic and Mitochondrial Metabolism Following Ischemic Stroke.
作者信息
Rahimpour Shokofeh, Meadows Ethan, Hollander John M, Karelina Kate, Brown Candice M
机构信息
Departments of Neuroscience, West Virginia University School of Medicine, Morgantown, WV, USA.
Microbiology, Immunology, and Cell Biology, West Virginia University School of Medicine, Morgantown, WV, USA.
出版信息
ASN Neuro. 2025;17(1):2488935. doi: 10.1080/17590914.2025.2488935. Epub 2025 Apr 10.
Maintaining optimal brain metabolism supports neuronal function, synaptic communication, and cognitive processes. During ischemic stroke, brain metabolism and cellular bioenergetics within the neurovascular unit are disrupted, emphasizing the significance of understanding the physiology and pathology of the stroke brain. The objective of this study was to quantify and compare phase-dependent changes in glycolysis and oxidative phosphorylation following ischemic stroke by using the Seahorse XFe24 Analyzer. Since there are limited established methods to quantify glycolytic activity in brain tissue, we optimized the accuracy and reproducibility of extracellular acidification rate (ECAR) measurement by increasing the incubation time following exposure to each reagent. Following optimization, we quantified both ECAR and the oxygen consumption rate (OCR), a measure of oxidative phosphorylation, in cortical brain tissue punches corresponding to the penumbra from mice subjected to ischemic stroke. ECAR and OCR were quantified in tissue punches from the injured (ipsilateral) and the non-injured (contralateral) hemispheres at 48 hours, 7 days, and 14 days post-stroke. Normalized ECAR measurements showed elevated glycolytic activity in the ipsilateral and contralateral hemispheres at 7 days post-stroke compared to other time points. In contrast, normalized OCR measurements showed a modest increase in basal respiration within the ipsilateral hemispheres between 48 hours and 14 days post-stroke. In summary, the results demonstrate that ischemic stroke results in a distinct phase-dependent metabolic phenotype in both cortical hemispheres that persists up to 14 days after injury.
维持最佳脑代谢有助于神经元功能、突触通讯和认知过程。在缺血性中风期间,神经血管单元内的脑代谢和细胞生物能量学受到破坏,这凸显了了解中风后脑的生理学和病理学的重要性。本研究的目的是使用海马XFe24分析仪量化和比较缺血性中风后糖酵解和氧化磷酸化的阶段依赖性变化。由于量化脑组织中糖酵解活性的既定方法有限,我们通过延长接触每种试剂后的孵育时间来优化细胞外酸化率(ECAR)测量的准确性和可重复性。优化后,我们在遭受缺血性中风的小鼠的半暗带对应的皮质脑组织切片中量化了ECAR和氧化磷酸化指标氧消耗率(OCR)。在中风后48小时、7天和14天,对受伤(同侧)和未受伤(对侧)半球的组织切片中的ECAR和OCR进行量化。标准化的ECAR测量结果显示,与其他时间点相比,中风后7天时同侧和对侧半球的糖酵解活性升高。相比之下,标准化的OCR测量结果显示,中风后48小时至14天期间,同侧半球的基础呼吸有适度增加。总之,结果表明,缺血性中风在两个皮质半球中导致了一种独特的阶段依赖性代谢表型,这种表型在损伤后可持续长达14天。