Abstract
NADH and NAD + act as electron donors and acceptors and NAD + was shown to stimulate mitochondrial biogenesis and metabolic health. We here develop a non-invasive Phosphorous Magnetic Resonance Spectroscopy ( 31P-MRS) method to quantify these metabolites in human skeletal muscle on a clinical 3 T MRI scanner. This new MR-sequence enables NADH and NAD+ quantification by suppressing α-ATP signal, normally overlapping with NADH and NAD +. The sequence is based on a double spin echo in combination with a modified z-Filter achieving strong α-ATP suppression with little effect on NAD + and NADH. Here we test and validate it in phantoms and in humans by measuring reproducibility and detecting a physiological decrease in NAD + and increase in NADH induced by ischemia. Furthermore, the 31P-MRS outcomes are compared to analysis in biopsies. Additionally, we show higher NAD + and lower NADH content in physically active older adults compared to sedentary individuals, reflecting increased metabolic health.
Original language | English |
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Article number | 9159 |
Journal | Nature Communications |
Volume | 15 |
Issue number | 1 |
DOIs | |
Publication status | Published - 24 Oct 2024 |
Externally published | Yes |
Keywords
- humans
- NAD/metabolism
- magnetic resonance spectroscopy/methods
- male
- muscle, skeletal/metabolism
- adults
- female
- age
- middle aged
- adenosine triphosphate/metabolism
- reproducibility of results
- phantoms, imaging
- magnetic resonance imaging/methods
- phosphorus isotopes