Abstract
Aging is a major risk for cognitive decline and transition to dementia. One well-known age-related change involves decreased brain efficiency and energy production, mediated in part by changes in mitochondrial function. Damaged or dysfunctional mitochondria have been implicated in the pathogenesis of age-related neurodegenerative conditions like Alzheimer’s disease (AD). The aim of the current study was to investigate mitochondrial function over frontal and temporal regions in a sample of 70 cognitively normal older adults with subjective memory complaints and a first-degree family history of AD. We hypothesized cerebral mitochondrial function and energy metabolism would be greater in temporal as compared to frontal regions based on the high energy consumption in the temporal lobes (i.e., hippocampus). To test this hypothesis, we used phosphorous (31P) magnetic resonance spectroscopy (MRS) which is a non-invasive and powerful method for investigating in vivo mitochondrial function via high energy phosphates and phospholipid metabolism ratios. We used a single voxel method (left temporal and bilateral prefrontal) to achieve optimal sensitivity. Results of separate repeated measures analyses of variance showed 31P MRS ratios of static energy, energy reserve, energy consumption, energy demand, and phospholipid membrane metabolism were greater in the left temporal than bilateral prefrontal voxels. Our findings that all 31P MRS ratios were greater in temporal than bifrontal regions support our hypothesis. Future studies are needed to determine whether findings are related to cognition in older adults.
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Data Availability
Data are managed under the data sharing agreement established with NIA and the parent R01 clinical trial Data Safety and Monitoring Board (DSMB) in the context of a phase II clinical trial (REVITALIZE, R01AG064587). All trial data will be made publicly available 2 years after completion of the parent clinical trial, per NIA and DSMB agreement.
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Acknowledgements
We would like to thank all the research participants at the McKnight Brain Institutes of the Universities of Florida (UF) and Arizona (UA), who generously volunteered their time and effort to help make this manuscript possible. We want to also thank to all research team members at the UF-Cognitive Neuroscience Lab and UA-Brain Imaging, Behavior and Aging Lab for their contributions to this project.
Funding
This study was supported by the National Institutes of Health (R01AG64587, F31AG071264, T32NS082168), the University of Florida and Arizona Evelyn F. McKnight Brain Institute, and University of Florida Norman Fixel Institute for Neurological Diseases.
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Lopez, F.V., O’Shea, A., Huo, Z. et al. Frontal–temporal regional differences in brain energy metabolism and mitochondrial function using 31P MRS in older adults. GeroScience 46, 3185–3195 (2024). https://doi.org/10.1007/s11357-023-01046-3
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DOI: https://doi.org/10.1007/s11357-023-01046-3