1. Sleep quality is related to brain glutamate and symptom severity in schizophrenia.
- Author
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Korenic SA, Klingaman EA, Wickwire EM, Gaston FE, Chen H, Wijtenburg SA, and Rowland LM
- Subjects
- Adult, Female, Gyrus Cinguli diagnostic imaging, Hippocampus diagnostic imaging, Humans, Magnetic Resonance Spectroscopy, Male, Middle Aged, Parietal Lobe diagnostic imaging, Severity of Illness Index, Young Adult, Glutamic Acid metabolism, Gyrus Cinguli metabolism, Hippocampus metabolism, Parietal Lobe metabolism, Schizophrenia complications, Schizophrenia metabolism, Schizophrenia physiopathology, Sleep Wake Disorders etiology, Sleep Wake Disorders metabolism, Sleep Wake Disorders physiopathology
- Abstract
Up to 80% of patients with schizophrenia experience sleep disturbances, which negatively impact daytime functioning. Given that the glutamatergic system is involved in the pathophysiology of schizophrenia as well as normal sleep-wake neurobiology, the current project aimed to determine whether sleep quality was related to brain glutamate levels in schizophrenia. The Pittsburgh Sleep Quality Index (PSQI) was used to assess subjective sleep quality and proton magnetic resonance spectroscopy (MRS) was used to quantify glutamate in the bilateral anterior cingulate, left parietal cortex, and left hippocampus. Results indicate that global PSQI scores were negatively correlated with the anterior cingulate and parietal glutamate levels. In patients with schizophrenia, poorer sleep quality correlated with greater positive symptom severity. Our findings suggest that poor sleep quality is related to greater positive symptom severity and lower levels of anterior cingulate glutamate in individuals with schizophrenia. Interventions to enhance sleep quality may prove beneficial for patients. Future studies will examine whether glutamate relates to objective measures of sleep quality, and whether glutamate may mediate the relationship between sleep quality and symptom severity across the schizophrenia-spectrum., (Copyright © 2019 Elsevier Ltd. All rights reserved.)
- Published
- 2020
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