Abstract
Purpose of Review
Schizophrenia (SZ) is a debilitating mental illness; existing treatments are partially effective and associated with significant side effect burden, largely due to our limited understanding of disease mechanisms and the trajectory of disease progression. Accumulating evidence suggests that metabolic changes associated with glucose metabolism, mitochondrial dysfunction, and redox imbalance play an important role in the pathophysiology of schizophrenia. However, the molecular mechanisms associated with these abnormalities in the brains of schizophrenia patients and the ways in which they change over time remain unclear. This paper aims to review the current literature on molecular mechanisms and in vivo magnetic resonance spectroscopy (MRS) studies of impaired energy metabolism in patients at clinical high risk for psychosis, with first-episode SZ, and with chronic SZ. Our review covers research related to high-energy phosphate metabolism, lactate, intracellular pH, redox ratio, and the antioxidant glutathione.
Recent Findings
Both first-episode and chronic SZ patients display a significant reduction in creatine kinase reaction activity and redox (NAD + /NADH) ratio in the prefrontal cortex. Chronic, but not first-episode, SZ patients also show a trend toward increased lactate levels and decreased pH value. These findings suggest a progressive shift from oxidative phosphorylation to glycolysis for energy production over the course of SZ, which is associated with redox imbalance and mitochondrial dysfunction.
Summary
Accumulating evidence indicates that aberrant brain energy metabolism associated with mitochondrial dysfunction and redox imbalance plays a critical role in SZ and will be a promising target for future treatments.
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Acknowledgements
The authors thank our volunteers and Mr. Elliot Kuan and Ms. Margaret Gardner for their assistance in the experiments and subject recruitment; Drs. Xiaopeng Song, Xi Chen, Cagri Yuksel, Virginie-Anne Chouinard, Kim Do Cuenod, and Bruce Cohen for their thoughtful discussions.
Funding
This research work was supported by National Institutes of Health (NIH) grants: R21MH114020, R01MH114982, P50MH115846, K24MH104449, R01AG066670, and R01MH095809.
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Over the past 3 years, Dr. Dost Ongur has received honoraria from Neumora Inc. and Guggenheim LLC for scientific presentations. No funding from these entities was used to support the current work, and all views expressed are solely those of the authors. None of the other authors have conflict of interest to declare.
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Stein, A., Zhu, C., Du, F. et al. Magnetic Resonance Spectroscopy Studies of Brain Energy Metabolism in Schizophrenia: Progression from Prodrome to Chronic Psychosis. Curr Psychiatry Rep 25, 659–669 (2023). https://doi.org/10.1007/s11920-023-01457-1
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DOI: https://doi.org/10.1007/s11920-023-01457-1