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JOURNAL ARTICLE
META-ANALYSIS
Zinc in schizophrenia: A meta-analysis.
General Hospital Psychiatry 2018 July
OBJECTIVE: The role of zinc homeostasis in various psychopathologies is an emerging area of interest. Zinc is strongly implicated in depressive disorders but is inadequately studied in schizophrenia, despite growing evidence of abnormal zinc transporters associated with schizophrenia. A meta-analysis of serum zinc concentrations in persons with schizophrenia was conducted to address this gap.
METHOD: PubMed and Embase were searched for all articles published through February 2018 that reported serum zinc concentrations in individuals with schizophrenia and in comparison subjects. A random-effects meta-analysis was carried out to compare mean serum zinc concentrations between the groups in terms of the weighted mean difference.
RESULTS: The current meta-analysis combined 10 studies, including a total of 658 schizophrenia patients and 1008 controls. Serum zinc concentration was significantly lower in individuals with schizophrenia than controls (12.81 μg/dl (1.96 μmol/l), t = -2.59, 95% CI: -22.50 to -3.12, p < 0.05). The reduction in zinc levels was more pronounced among inpatients and newly diagnosed, drug-naïve patients.
CONCLUSIONS: The current meta-analysis supports a disturbance of zinc homeostasis in individuals with schizophrenia compared to healthy controls, although the relationship between reduced serum zinc levels and psychotic symptoms remains unknown. Altered serum zinc might be linked to defective transporters and/or inflammation that impact the brain's glutamatergic system.
METHOD: PubMed and Embase were searched for all articles published through February 2018 that reported serum zinc concentrations in individuals with schizophrenia and in comparison subjects. A random-effects meta-analysis was carried out to compare mean serum zinc concentrations between the groups in terms of the weighted mean difference.
RESULTS: The current meta-analysis combined 10 studies, including a total of 658 schizophrenia patients and 1008 controls. Serum zinc concentration was significantly lower in individuals with schizophrenia than controls (12.81 μg/dl (1.96 μmol/l), t = -2.59, 95% CI: -22.50 to -3.12, p < 0.05). The reduction in zinc levels was more pronounced among inpatients and newly diagnosed, drug-naïve patients.
CONCLUSIONS: The current meta-analysis supports a disturbance of zinc homeostasis in individuals with schizophrenia compared to healthy controls, although the relationship between reduced serum zinc levels and psychotic symptoms remains unknown. Altered serum zinc might be linked to defective transporters and/or inflammation that impact the brain's glutamatergic system.
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