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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
Redox Dysregulation in Schizophrenia Revealed by in vivo NAD+/NADH Measurement.
Schizophrenia Bulletin 2017 January
Balance between the redox pair of nicotinamide adenine dinucleotides (oxidized NAD+ and reduced NADH), reflects the oxidative state of cells and the ability of biological systems to carry out energy production. A growing body of evidence suggests that an "immuno-oxidative" pathway including oxidative stress, mitochondrial dysfunction, neuroinflammation, and cell-mediated immune response may contribute to disruptions in brain activity in schizophrenia (SZ). The aim of this study is to assess possible redox imbalance in SZ patients by using a novel in vivo 31 P MRS technique. The participants included 40 healthy controls, 21 chronic SZ, 13 first-episode (FE) SZ, and 18 FE bipolar disorder (BD) patients (as a psychiatric control group). All participants initially underwent structural imaging at a 3 Tesla (3 T) and 31 P MRS measurements were performed on a 4 T MR scanner. NAD+ and NADH components were determined by nonlinear least-square fitting of the model simulated spectra; these incorporated prior chemical shift and coupling constant information to in vivo resonances obtained from 31 P MRS experiments. We found a significant reduction in the NAD+/NADH ratio in chronically ill SZ patients compared to a matched healthy control group, and in FE SZ patients compared to both a matched FE BD patient group and a matched healthy control group. These findings provide evidence for redox imbalance in the brain in all phases of SZ, potentially reflecting oxidative stress.
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