Quantitative measurement of redox state in human brain by 31 P MRS at 7T with spectral simplification and inclusion of multiple nucleotide sugar components in data analysis.
Magn Reson Med
; 84(5): 2338-2351, 2020 11.
Article
em En
| MEDLINE
| ID: mdl-32385936
ABSTRACT
PURPOSE:
To develop a simplified method for quantitative measurement of NAD+ /NADH (nicotinamide adenine dinucleotides) levels in human brain by 31 P MRS without interference from the α-ATP signal and with inclusion of multiple UDP-sugar components.METHODS:
Simple pulse-acquire 31 P MR spectra were collected at 7T with and without a frequency-selective inversion pulse to remove the dominant α-ATP signal from the underlying NAD(H) signal. Careful inspection of the 31 P signal at -9.8 ppm previously assigned to UDP-glucose revealed multiple UDP-sugar components that must also be considered when deconvoluting the NAD(H) signal to quantify NAD+ and NADH. Finally, the overlapping NAD(H) and UDP(G) resonances were deconvoluted into individual components using Voigt lineshape analysis and UDP(G) modeling.RESULTS:
The inversion-based spectral editing method enabled clean separation of the NAD(H) signal from the otherwise dominant α-ATP signal. In addition, the upfield signal near -9.8 ppm appears more "quartet-like" than a simple doublet consistent with contributions from other nucleotide sugars such as UDP-galactose, UDP-N-acetyl-galactosamine, and UDP-N-acetyl-glucosamine in addition to UDP-glucose. Deconvolution of the combined NAD(H) and UDP(G) signals showed that the measured NAD+ /NAD ratio was heavily influenced by UDP(G) modeling (7.5 ± 1.8 when the UDP(G) signal was fitted as multiple doublets versus 5.3 ± 0.6 when a simplified pseudo doublet model was used). In a test/re-test experiments separated by 2 weeks, consistent NAD+ /NADH ratios were measured in the brain of seven human subjects.CONCLUSIONS:
The NAD+ /NADH ratio in human brain can be measured using 31 P MR spectra simplified by spectral editing and with inclusion of multiple UDP-sugar components in the data analysis.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Análise de Dados
/
Nucleotídeos
Limite:
Humans
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article