BACKGROUND: Schizophrenia is associated with impaired antioxidant defense, including abnormal serum, plasma, and red blood cell (RBC) oxidative stress parameters. We performed a meta-analysis of these associations, considering the effect of clinical status and antipsychotic treatment after an acute exacerbation of psychosis. METHODS: We identified articles by searching PubMed, PsychInfo, and Institute for Scientific Information, and the reference lists of identified studies. RESULTS: Forty-four studies met the inclusion criteria. Total antioxidant status seemed to be a state marker, because levels were significantly decreased in cross-sectional studies of serum and plasma in first-episode psychosis (FEP) and significantly increased in longitudinal studies of antipsychotic treatment for acute exacerbations of psychosis (p < .01 for each). The RBC catalase and plasma nitrite seemed to be state-related markers, because levels in cross-sectional studies were significantly decreased in FEP (p < .01) and significantly increased in stable outpatients (p = .01). In contrast, RBC superoxide dismutase seemed to be a trait marker for schizophrenia, because levels in cross-sectional studies were significantly decreased in acutely relapsed inpatients, FEP, and stable outpatients (p < .01 for each). CONCLUSIONS: Oxidative stress abnormalities in FEP suggest an effect that might be independent of antipsychotic medications. Although some parameters (total antioxidant status, RBC catalase, and plasma nitrite) might be state markers for acute exacerbations of psychosis, others (RBC superoxide dismutase) might be trait markers; however, more longitudinal studies are needed. Our findings suggest that oxidative stress might serve as a potential biomarker in the etiopathophysiology and clinical course of schizophrenia.
BACKGROUND:Schizophrenia is associated with impaired antioxidant defense, including abnormal serum, plasma, and red blood cell (RBC) oxidative stress parameters. We performed a meta-analysis of these associations, considering the effect of clinical status and antipsychotic treatment after an acute exacerbation of psychosis. METHODS: We identified articles by searching PubMed, PsychInfo, and Institute for Scientific Information, and the reference lists of identified studies. RESULTS: Forty-four studies met the inclusion criteria. Total antioxidant status seemed to be a state marker, because levels were significantly decreased in cross-sectional studies of serum and plasma in first-episode psychosis (FEP) and significantly increased in longitudinal studies of antipsychotic treatment for acute exacerbations of psychosis (p < .01 for each). The RBC catalase and plasma nitrite seemed to be state-related markers, because levels in cross-sectional studies were significantly decreased in FEP (p < .01) and significantly increased in stable outpatients (p = .01). In contrast, RBC superoxide dismutase seemed to be a trait marker for schizophrenia, because levels in cross-sectional studies were significantly decreased in acutely relapsed inpatients, FEP, and stable outpatients (p < .01 for each). CONCLUSIONS:Oxidative stress abnormalities in FEP suggest an effect that might be independent of antipsychotic medications. Although some parameters (total antioxidant status, RBC catalase, and plasma nitrite) might be state markers for acute exacerbations of psychosis, others (RBC superoxide dismutase) might be trait markers; however, more longitudinal studies are needed. Our findings suggest that oxidative stress might serve as a potential biomarker in the etiopathophysiology and clinical course of schizophrenia.
Authors: Barnaby Nelson; G Paul Amminger; Hok Pan Yuen; Nicky Wallis; Melissa J Kerr; Lisa Dixon; Cameron Carter; Rachel Loewy; Tara A Niendam; Martha Shumway; Sarah Morris; Julie Blasioli; Patrick D McGorry Journal: Early Interv Psychiatry Date: 2017-07-18 Impact factor: 2.732
Authors: Thomas W Sedlak; Leslie G Nucifora; Minori Koga; Lindsay S Shaffer; Cecilia Higgs; Teppei Tanaka; Anna M Wang; Jennifer M Coughlin; Peter B Barker; Jed W Fahey; Akira Sawa Journal: Mol Neuropsychiatry Date: 2018-04-17
Authors: Sang-Young Kim; Bruce M Cohen; Xi Chen; Scott E Lukas; Ann K Shinn; A Cagri Yuksel; Tao Li; Fei Du; Dost Öngür Journal: Schizophr Bull Date: 2016-09-24 Impact factor: 9.306
Authors: Eunkyoung Kim; Jinyang Li; Mijeong Kang; Deanna L Kelly; Shuo Chen; Alessandra Napolitano; Lucia Panzella; Xiaowen Shi; Kun Yan; Si Wu; Jana Shen; William E Bentley; Gregory F Payne Journal: Proc IEEE Inst Electr Electron Eng Date: 2019-04-29 Impact factor: 10.961