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Comparative Study of the Effects of Atypical Antipsychotic Drugs on Plasma and Urine Biomarkers of Oxidative Stress in Schizophrenic Patients

Authors Dietrich-Muszalska A, Kolodziejczyk-Czepas J, Nowak P

Received 5 November 2020

Accepted for publication 20 January 2021

Published 17 February 2021 Volume 2021:17 Pages 555—565

DOI https://doi.org/10.2147/NDT.S283395

Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 4

Editor who approved publication: Dr Roger Pinder


Anna Dietrich-Muszalska,1 Joanna Kolodziejczyk-Czepas,2 Pawel Nowak2

1Medical University of Lodz, Department of Biological Psychiatry and Neurophysiology, Lodz, Poland; 2University of Lodz, Department of General Biochemistry, Lodz, Poland

Correspondence: Anna Dietrich-Muszalska
Department of Biological Psychiatry and Neurophysiology Medical University of Lodz, Lodz, 92-215, Poland
, Mazowiecka 6/8 Tel +691881787
Fax +48 42 2725652
Email tzn_lodz@post.pl

Purpose: Evidence that antipsychotic drugs (ADs) can affect oxidative stress estimated with various biomarkers in schizophrenic patients is controversial and limited. Therefore, in the present study, we assessed the ability of six atypical ADs (clozapine, olanzapine, quetiapine, risperidone, aripiprazole, and ziprasidone) used in schizophrenia treatment to modulate oxidative damage to different biomolecules such as lipids and proteins.
Patients and Methods: We measured the levels of oxidative stress markers in plasma and urine: total antioxidant capacity by FRAP (according to a modified method of Benzie & Strain), thiobarbituric acid reactive species – TBARS (spectrophotometric method), 4-hydroxy-2-nonenal (4-HNE) (OxiSelect™ HNE Adduct Competitive ELISA Kit), 3-nitrotyrosine (3-NT) (OxiSelect™ Nitrotyrosine ELISA Kit) in plasma, and F2-isoprostanes (BIOXYTECH® Urinary 8-epi-Prostaglandin F2α) in the urine of 60 schizophrenic patients (before and after treatment) and in 30 healthy subjects.
Results: Our results showed that in schizophrenic patients levels of lipid peroxidation markers (TBARS, F2-isoprostanes) were higher than in healthy subjects but FRAP in schizophrenic patients was lower than in healthy controls and increased after 4-week treatment with tested ADs. A 4-week treatment with ADs caused the improvement of psychopathology symptoms estimated by Positive and Negative Syndrome Scale (PANSS) that was accompanied by decreased lipid peroxidation (F2-isoprostanes, TBARS; p=2.9x10− 6, p=7.6x10− 5, respectively) and an increase in total antioxidative capacity (FRAP) (p=5.16x10− 16).
Conclusion: Atypical antipsychotics especially clozapine, olanzapine and quetiapine demonstrate the effective outcome of antipsychotic treatment, beneficial antioxidative action by reducing lipid peroxidation and increased total plasma antioxidant activity.

Keywords: schizophrenia, antipsychotics, F2-isoprostanes, TAC, other oxidative markers

Introduction

Schizophrenia is a multifactorial psychiatric illness with diverse clinical manifestations characterized by cognitive, emotional and behavioral disturbances affecting about 1% of the population worldwide. The manifestations include, among others, positive symptoms, negative symptoms and working memory and other cognitive deficits.1,2 The etiopathogenesis of schizophrenia has not yet been explained, and a multitude of theories have been proposed over the years. Schizophrenia is a neurodevelopmental disease; there is evidence supporting a progressive and possibly neurodegenerative process.3 Clinical observations complemented by neuroimaging and genetic studies prove the neurodevelopmental hypothesis.4 On the other hand, neuropathological studies support the neurodegenerative hypothesis. A hypothesis, called the progressive neurodevelopmental model, has also emerged.5 Cell dysfunction, apoptotic process, decreased neurogenesis and neuroplasticity are described in the brain of schizophrenic individuals.6–8 There has been accumulating evidence supporting the involvement of oxidative/nitrative stress due to increased activity of reactive oxygen species (ROS) and reactive nitrogen species (RNS) as well as decreased antioxidant protection in the development and course of the disease; leading to damage to lipids, proteins, and DNA.9 Antipsychotic medications are standard care for patients and ADs are commonly used in the treatment of schizophrenia and other psychiatric disorders. Progressive pathophysiological processes occurring within the brain of patients with schizophrenia may be modulated by ADs that have the potential for neuroprotection or modulation of chemical neurotransmission. Efficacy of ADs, their mechanism of action and potential to exert effects on cellular processes in the brain may play a neuroprotective role in schizophrenia.10 It is known that atypical antipsychotics block dopamine D2 receptors as well as serotonin receptors (eg 5HT2A) and due to these processes they perform their main therapeutic function.10 Their impact on neuronal signaling systems is complex. ADs can be divided into the first generation; typical ADs (TADs, eg haloperidol) and the second generation; atypical ADs (AADs, eg olanzapine, clozapine, quetiapine, aripiprazole, risperidone and ziprasidone). Although TADs improve positive symptoms, they are marginally effective for negative symptoms and ineffective for cognitive deficits.11 TADs (eg haloperidol) treat some of the symptoms of schizophrenia, such as delusions and hallucinations, but can have some side effects including extrapyramidal signs, tardive dyskinesia and hyperprolactinemia. AADs block both dopamine and serotonin binding to their specific receptors.12 Some of them may have additional therapeutic properties such as cognitive enhancement, reduction of negative symptoms, prevention of enhanced relapse of disease, regression and clinical deterioration.13 AADs are increasingly prescribed, often replacing typical TADs.14 Recent evidence suggests that AADs may mitigate or reverse some of the morphological changes observed in schizophrenic patients such as gray matter volume reduction, caudate hypertrophy, white matter volume increase and decrease in dendritic spine density in the prefrontal cortex.10 However, treatment with some AADs causes side effects associated with body weight gain and development of metabolic syndrome, agranulocytosis, and hepatotoxicity.15 Although the biological mechanisms involved in the side effects induced by antipsychotics remain to be elucidated, oxidative stress may be involved in these mechanisms. There are numerous clinical and experimental reports demonstrating changes of oxidant/antioxidant balance in response to the treatment with ADs. In rats, not only haloperidol but also other AADs (clozapine, olanzapine, risperidone) induced a significant decrease in the activity of superoxide dismutase (SOD) and catalase (CAT), and increased lipid peroxidation.16 The reduced activities of antioxidant enzymes observed in schizophrenic patients and free radical-mediated changes in the structure of different biomolecules measured by the increased level of specific oxidative stress markers may contribute to specific aspects of schizophrenia symptomatology and partly to the complications caused by the treatment with antipsychotics. To date, a majority of studies have presented an alteration in the antioxidant defense system (eg activities of enzymes) and in the level of lipid peroxidation in vitro as well as in animal model; fewer studies showed peroxidation/nitration products derived from cellular biomolecules such as lipids or proteins in schizophrenic patients treated with antipsychotics.9,17–20 It cannot be excluded that atypical antipsychotics such as clozapine, quetiapine, olanzapine, risperidone, aripiprazole, and ziprasidone may differentially affect the oxidative stress markers since they do not work in the same way. Therefore, the purpose of our study was to evaluate the effect of 4-week treatment with antipsychotics on the total antioxidant capacity of plasma (ferric reducing ability of plasma – FRAP) and the levels of peroxidation products of lipids in urine and plasma (F2-isoprostanes, TBARS, 4-HNE, and 3-nitrotyrosine) in schizophrenic patients.

Materials and Methods

Subjects

The study involved 30 healthy controls and 60 patients with schizophrenia who met the eligibility criteria (inclusion/exclusion criteria) shown in Table 1. The inclusion and exclusion criteria for healthy controls were the same as for schizophrenic patients (excluding AADs treatment). There was no significant difference between patients and control group on any characteristics such as sex, age, body mass index and smoking.

Table 1 Inclusion and Exclusion Criteria of Schizophrenic Patients

Methods

Patients with a diagnosis of schizophrenia (paranoid type) according to DSM-IV criteria (American Psychiatric Association, 1994)21 were interviewed with a special questionnaire (treatment, course of diseases) and clinically assessed for movement disorders, including dyskinesia and other extrapyramidal symptoms (using the Simpson–Angus Scale (SAS) and the Barnes Akathisia Rating Scale (BARS)).22,23 The patients with schizophrenia were assessed according to the Positive and Negative Syndrome Scale (PANSS; Kay et al, 1987).24

Healthy controls were screened assessing their medical history and using medical structured interviews; psychiatric examination using the M.I.N.I.—Mini International Neuropsychiatric Interview25 was performed. Both study groups had neurological and physical examinations and laboratory tests, including biomarkers of oxidative stress, glucose and total cholesterol, LDL, HDL, triglycerides concentrations, performed.

All participants granted written informed consent before beginning of the study after receiving a full explanation of this study. The study was approved by the Committee for Research on Human Subjects of the Medical University of Lodz (RNN/899/2000) and conducted according to the ethical obligations of the Declaration of Helsinki.

The detailed characteristics of studied groups are shown in Table 2.

Table 2 Clinical Characteristics of Patients with Schizophrenia and Healthy Controls

Study Protocol

Patients

The study had an open-label design with run-in period and consisted of daily patients observation and 4 visits as below:

At visit 1 (preliminary): consent to participation in the study was obtained, medical interviews and assessments in terms of inclusion criteria were conducted.

At visit 2 (1st day): the patients had physical examination and neuropsychiatric assessment including psychometric scales (eg PANSS); the beginning of the run-in period.

At visit 3 (baseline; after run-in period and after 2 weeks of drug application, when the final stable dose of AADs for acute episode of schizophrenia was reached): neuropsychiatric and physical assessments, including psychometric scale (eg PANSS), were conducted; blood and urine samples were collected and laboratory tests, including biomarkers of oxidative stress, were performed. The patients were under no influence of emergency drugs eg anxiolytics, hypnotics, analgesics, etc.

At visit 4 (endpoint; after 4-week treatment with stable doses for acute episode of schizophrenia): physical examination and neuropsychiatric assessment, including psychometric scale (eg PANSS) were conducted; blood and urine samples were collected and laboratory tests, including biomarkers, were performed. The patients were under no influence of emergency drugs eg anxiolytics, hypnotics, analgesics, etc.

Healthy Controls

At visit 1 (preliminary) consent to participation in the study was obtained, medical interviews and assessments in terms of inclusion criteria were conducted.

At visit 2 (1st day) the psychiatric examination using the M.I.N.I—Mini International Neuropsychiatric Interview, neurological and physical examinations were performed; blood and urine samples were collected and laboratory tests, including biomarkers, were performed.

Isolation of Plasma and Collection of Urine Samples

Blood samples (2 x 7.5 mL) from healthy controls and patients were collected into the solution of ACD (citric acid/citrate/dextrose; 5:1 v/v) between 8.00 and 8.30 a.m. and centrifuged for 20 min at 2500 rpm and 20°C in the Sigma 3K30 centrifuge to obtain plasma for the further determination of TBARS, 4-HNE, FRAP and 3-NT. F2-isoprostanes were determined in urine samples. To that end, about 10 mL of spot morning urine was collected according to the procedure by Roberts and Morrow (2000).28,29 Collected samples were stored at −80°C for no longer than 6 months. Each donor’s sample was assayed in duplicate.

Experimental Procedure

Evaluation of Lipid Peroxidation

Determination of Urinary Isoprostanes

Measurements were carried out using an enzyme immunoassay for urinary isoprostane, ie OxisResearch™ kit (BIOXYTECH® Urinary 8-epi-Prostaglandin F2α, OXIS Health Products, Inc., Foster City, USA), according to the protocol of the manufacturer. The method is based on a competitive enzyme-linked immunoassay (ELISA), detecting the 8-epi-prostaglandin-F. The quantitative analysis of the obtained results was done with the use of a standard curve (ranging from 0.05 to 100 ng/mL of 8-epi-prostaglandin-F).

Measurements of the Thiobarbituric Acid-Reactive Substances (TBARS)

Samples of plasma were transferred to an equal volume of 20% (v/v) cold trichloroacetic acid in 0.6 M HCl and centrifuged at 1200×g for 15 min. One volume of clear supernatant was mixed with 0.2 volume of 0.12 M thiobarbituric acid in 0.26 M Tris, pH 7.0, and immersed in a boiling water bath for 15 min. The absorbance was measured in the SEMCO spectrophotometer (at 535 nm in 1-cm cuvettes), according to the modification of the Rice-Evans method.30,31 The TBARS concentrations expressed in μmol/L were calculated based on the absorbance value, using the molar extinction coefficient for TBARS (ε = 1.56 × 105 M−1 × cm−1).

Determination of Hydroxynonenal (4-HNE) in Plasma

The assay was carried out using OxiSelect™ HNE Adduct Competitive ELISA Kit (Cell Biolabs Inc., San Diego, USA), according to the protocol of the manufacturer. The method is based on an immunodetection of the protein-HNE adducts. Concentrations of the adducts in the examined samples were quantified using the predetermined HNE-BSA standard curve (ranging from 1.56 to 200 μg/mL).

Determination of 3-Nitrotyrosine in Plasma

Determination of plasma 3-nitrotyrosine was carried out with the use of OxiSelect™ Nitrotyrosine ELISA Kit (Cell Biolabs Inc., San Diego, USA). The procedure was based on a competitive enzyme-linked immunosorbent assay. The procedure was executed according to the protocol of the manufacturer. Quantitative determination of 3-nitrotyrosine in the examined samples was performed on the basis of a standard curve, prepared with increasing concentration (0.049 to 200 μg/mL) of nitrated bovine serum albumin, which corresponded to 3-nitrotyrosine concentrations of 1.95–8000 nM.

Evaluation of Total Antioxidant Capacity of Plasma

The total antioxidant capacity (TAC) of blood plasma was evaluated with FRAP (ferric reducing ability of plasma) method dependent on non-enzymatic antioxidants and determined according to a modified method by Benzie & Strain, 1996.32 The procedure was standardized at the Department of General Biochemistry, University of Lodz.33

Statistical Analysis

All the values in this study were expressed as the mean±standard error of the mean. In order to eliminate outliers, Grubbs’ test was performed. All data had normal distribution as evaluated with the Shapiro–Wilk test. The data (F2-isoprostanes, TBARS, 4-HNE level, 3-NT and FRAP) from healthy subjects and patients with schizophrenia were analyzed with Student’s t-test. The significance of differences for study marker levels (baseline and endpoint at 4 weeks after therapy with stable doses) was calculated using the paired Student’s t-test. The data at ADs were analyzed with multifactorial variance analysis (two-way analysis of variance [ANOVA] test). Post hoc comparisons for the oxidative markers levels were carried out with Fisher`s Least Significant Difference test (LSD test) STATISTICA v.10 by StatSoft (Palo Alto, CA, USA) was used.

Results

Our results show that levels of two of the studied oxidative markers in schizophrenic patients (F2 – isoprostanes and TBARS) were higher than in healthy controls (Figure 1A and B), whereas total antioxidant capacity of plasma estimated by FRAP assay in schizophrenic patients was lower (Figure 2) than in the controls. 4-HNE levels in both groups did not differ significantly (Figure 1C). Similarly, the received results indicated that levels of 3-NT were low. All the obtained values were (0.1–1.5 µg/mg protein) about the limit of detection, with no statistical differences between the control and schizophrenic groups. The effect of treatment with selected AADs on the level of markers of oxidative stress (F2 – isoprostanes, TBARS and FRAP) are presented in Figure 3. After 4-week treatment (with stable doses) of schizophrenic patients with selected antipsychotics, a reduction in levels of F2-isoprostanes (Figure 3A) and TBARS (Figure 3B) was observed (p=2.9x10−6, p=7.6x10−5, respectively), while the levels of 4-HNE and 3-NT were not changed. An increase in FRAP was noted after 4-week treatment in patients compared to baseline (p=5.16x10−16) (Figure 3C). The ANOVA test (two-way analysis of variance test) showed that the effects of atypical antipsychotics (clozapine, olanzapine, quetiapine, risperidone, aripiprazole, and ziprasidone) on oxidative stress markers were significantly different for F2-isoprostanes and FRAP (p=0.003; p=4.53x10−8, respectively). The post hoc analysis (LSD test) showed that clozapine, olanzapine and quetiapine exhibited the best antioxidant properties: the highest increase was in FRAP and decrease in F2-isoprostanes at endpoint compared to baseline (p=1.0x10−5; p=0.003, respectively). The effect of treatment with clozapine, olanzapine, and quetiapine on the level of oxidative stress markers (F2-isoprostanes and FRAP) is presented in Figure 4A and B. Effects of 4-week treatment with stable doses of clozapine, olanzapine and quetiapine were connected with changes of biomarkers: decrease in F2-isoprostanes (differences between baseline (S1) and endpoint (S2)) were significant about 42%, 50%, 82%, respectively, and increase in FRAP (differences between baseline (S1) and endpoint (S2)) were significant about 72%, 65%, 81%, respectively (Figure 5). Weaker antioxidant effects were exhibited by aripiprazole, risperidone and ziprasidone (differences between baseline (S1) and endpoint (S2) were not significant).

Figure 1 The comparison of lipid peroxidation markers between healthy controls (n=30) and schizophrenic patients (n=60) in plasma and urine. The level of lipid peroxidation markers in urine and plasma of controls and schizophrenic patients (mean±SEM) in all calculations Student’s t-test was used: F2-isoprostanes level in urine 0.33 ± 0.06 vs.9.94 ± 0.74; p=1.19x10−09 (A), TBARS 1.09± 0.09 vs 1.72 ± 0.08; p=1.53x10−02 (B), 4-HNE p ≤ 0.05 (C).

Figure 2 The comparison of FRAP level between control group (n=30) and schizophrenic patients (n=60). (Mean±SEM) 1.41 ± 0.03 vs 0.67 ± 0.02; p=2.08x10−24 (Student`s t- test).

Figure 3 The effect of AADs on the level of F2-isoprostanes in urine (A) and FRAP (B) in plasma of schizophrenic patients at baseline S(1) and after 4 weeks of treatment (endpoint) S(2). The significance of differences for study marker levels (baseline and endpoint at 4 weeks after therapy with stable doses of AADs) was calculated using the paired Student’s t-test; for F2-isoprostanes level p=1.68x10−07 (A), for FRAP p=5.16x10−11 (B).

Figure 4 The effect of clozapine (CLO), olanzapine (OLA), and quetiapine (QUE) on the level of F2-isoprostanes in urine (A) and FRAP in plasma (B) of schizophrenic patients at baseline S(1) and after 4-week treatment (endpoint) S(2). (A) The effect of CLO, OLA, and QUE on the level of F2-isoprostanes in urine of schizophrenic patients at baseline S(1) and endpoint S(2); mean ± SEM: for CLO 16.52+4.5; 6.95+0.1.2; p=0,0005; for QUE p<0.05; for OLA p <0.05. (B) The effect of CLO, OLA, and QUE on the level of FRAP in plasma of schizophrenic patients at baseline S(1) and endpoint S(2); mean ± SEM: for CLO 0.58±0.04; 1.01+0.07, p= 1.1x10−8; for QUE 0.47±0.06; 0.84± 0.06, p= 0.0002; for OLA 0.42± 0.05; 0.69±0.08, p=0.005.

Figure 5 An increase of FRAP level (A) and decrease of F2-isoprostanes level (B) in schizophrenic patients at baseline S(1) and after 4-week treatment (endpoint) S(2) expressed as a percentage.

Discussion

Treatment with antipsychotic drugs leads to considerable alteration of oxidation-reduction balance and may have some effects on oxidative stress in schizophrenic patients. It should be underlined that pharmacological mechanisms of several AADs action may be different. Atypical antipsychotic drugs are a class of agents that have become the most widely used to treat schizophrenia and a variety of psychoses because of their superiority regarding extrapyramidal symptoms.34 They remain the standard care for patients with schizophrenia and other psychiatric disorders despite their side effects such as metabolic syndrome, agranulocytosis or occurring less frequently than for typical antipsychotics, extrapyramidal symptoms.35 The adverse reactions associated with extrapyramidal symptoms and tardive dyskinesia (TD) have been attributed to neuronal cell damage caused by reactive oxygen species (ROS) induced partly by antipsychotics.36 The biological mechanisms underlying these side effects remain unclear. It has been hypothesized that oxidative stress induced by antipsychotics treatment may be involved in these adverse effects. Oxidative stress with the production of free radicals and oxidative damage to biomolecules may contribute to specific aspects of schizophrenic symptomatology and complications of its treatment (prominent negative symptoms, TD, parkinsonian symptoms).35 Chronic treatment with ADs may lead to an increase in free radical production, decrease in the activity of antioxidant enzymes and augmentation of damage to lipids, proteins, and nucleic acids. Regarding atypical antipsychotics, there has been increased concern about the serious metabolic side effects induced by these drugs. Clozapine has been associated with disturbances of antioxidant enzymes and oxidation of protein involved in energy metabolism and metabolic side effects.37 Bošković et al38 claimed that ADs induce oxidative stress via dopamine metabolism. This process leads to the formation of ROS that react with cellular components such as lipids, proteins, and nucleic acids. In our study, we measured the levels of biomarkers of oxidative/nitrative changes in proteins, and lipids in schizophrenic patients treated with different atypical antipsychotics. Lipid peroxidation is a major consequence of oxidative damage to a variety of cells in vivo. In our previous study, we showed that F2-isoprostanes in the urine of schizophrenic patients were increased.39 The present study showed that the level of isoprostanes was higher in the urine of schizophrenic patients than in healthy controls and it decreased after 4-week treatment with stable doses of tested AADs. TBARS or the end products of lipid peroxidation such as malondialdehyde (MDA) are widely used markers of oxidative stress in clinical studies.19,40–43 We used TBARS estimation to establish changes in lipid peroxidation in plasma of schizophrenic patients and showed that TBARS level was higher in schizophrenics than in healthy subjects but after the treatment (4 weeks) it significantly decreased in schizophrenics compared to baseline. 4HNE is a common lipid peroxidation product and a signal of oxidative stress at the cell membrane. Lipid peroxidation-derived 4-HNE easily forms covalent adducts with nucleophilic functional groups in macromolecules such as proteins, DNA, and lipids.44 Medina-Hernández et al 200744 found higher concentrations of MDA and 4-HNE in the plasma. In our study, we did not observe a significantly increased level of 4-HNE in plasma of schizophrenic patients in comparison with healthy controls. Our results showed that the total antioxidant capacity of plasma (FRAP) in schizophrenic patients was lower than in healthy subjects but after 4 weeks of treatment with selected tested AADs (with stable doses) the level of FRAP increased and was higher than in healthy subjects and schizophrenics before the treatment (baseline). Antipsychotic drugs may affect biochemical processes in the brain, particularly the dopamine system with free radical production and oxidative and nitrative damage to brain structure. Neurons are particularly vulnerable to the damage by free radicals, ROS and RNS. Nitric oxide (NO) produced in brain mainly enzymatically by NOS (nitric oxide synthase) is involved in brain functioning and may play a dual role, both neuroprotective and neurotoxic.45 Its reaction with superoxide radical and formation of peroxynitrite leads to damaging effects. Peroxynitrite reacts with different biological molecules, damaging proteins, nucleic acids, initiating lipid peroxidation in membranes of the cells. Peroxynitrite causes mainly nitration of tyrosine residue in proteins to form 3-nitrotyrosine (3-NT) – marker of nitrative stress.45 The level of NO metabolites was found to be significantly higher in platelets of patients treated with AADs than in platelets of control subjects.46 Increased protein nitration, as measured by the level of 3-NT, was observed in the prefrontal cortex of schizophrenic patients.47 Increased protein nitration in CNS may be reflected by the changes of the level of 3-NT in blood platelets.46 In our study, the level of 3-NT in plasma proteins of schizophrenic patients was very low; therefore, we did not observe any changes induced by AADs. All studied AADs approved by the Food and Drug Administration (FDA) for the treatment of schizophrenia (olanzapine, clozapine, quetiapine, aripiprazole, risperidone and ziprasidone) showed varied antioxidative activities. These findings are based on studies of antipsychotic drugs at therapeutic doses used to the treatment of an acute episode of schizophrenia. In our present study, we showed that schizophrenic patients treated with some AADs monotherapy had increased TAC level. It confirms the suggestions of other authors.48 Glica et al (2014) have shown that in chronic schizophrenic patients after clozapine or risperidone treatment the changes in plasma total antioxidant activity were observed. The changes correlated with the activities of antioxidant enzyme paraoxonase (PON).49 We were the first to study patients with effective improvement in AADs monotherapy. After 4-week treatment with the studied AADs drugs, we found in schizophrenics patients with improved clinical state significantly decreased F2 isoprostanes level and increased TAC level. Clozapine, olanzapine and quetiapine exhibited the best antioxidant properties. Similarly, in our in vitro studies, we demonstrated antioxidative activity of some AADs, the highest of olanzapine,50 followed by clozapine and in some cases quetiapine.50,51 In turn, in another study in plasma in vitro model, we found antioxidative properties of quetiapine.51 The other authors (Ustundag et al, 2006; Virit et al, 2009)48,52 observed both in the first episode and chronic schizophrenics that positive symptoms of schizophrenia have also been related to low antioxidative capacity. In turn Al-Chalabi et al, 200953 described increased TAS levels in patients treated with olanzapine. Our present results indicate that treatment of schizophrenic patients with AADs leads to patients’ improvement (measured by PANSS) simultaneously with the reduction of oxidative stress measured by specific biomarker levels. It should be underlined that the effects of tested drugs on the levels of oxidative stress biomarkers and the mechanisms of their action are still unclear. Therefore, further clinical and biochemical research should be carried out. This pilot study will be continued. The main problem of our paper concerns the exclusion of some patients in the study caused by the drug changes or by treatment of patients with additional antipsychotics due to the lack of improvement or insufficient effects of treatment. Taken together, our results suggest that atypical antipsychotic drugs may have a protective effect against oxidative stress in schizophrenic patients.

Conclusion

Atypical antipsychotics especially clozapine, olanzapine and quetiapine demonstrate the effective outcome of antipsychotic treatment and beneficial antioxidative action by reducing lipid peroxidation and increasing TAC measured by FRAP.

Acknowledgments

This work was supported by the National Science Centre, Poland (Grant No. 2011/01/B/NZ4/04903) and Medical University of Lodz, Poland (Grant No.: 503-01-001-19-00, 503-01-002/003/004-18).

Author Contributions

All authors contributed to data analysis, drafting or revising the article, agreed on the journal to which the article will be submitted, gave final approval of the version to be published, and agree to be accountable for all aspects of the work. The authors are grateful to Prof. D. Nowak for his consultations.

Disclosure

The authors declare no conflicts of interest in this manuscript.

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