title: A comparative study of oxidative stress and interrelationship of important antioxidants in haloperidol and olanzapine treated patients suffering from schizophrenia.
abstract: BACKGROUND
  Oxidative stress induced lipid peroxidation has been a significant contributing factor for schizophrenia. Older antipsychotics, like haloperidol , were found to increase lipid peroxidation, whereas, the newer atypical antipsychotics, like olanzapine, did not generate free radicals as metabolic end products.
  
  
  OBJECTIVE
  The interrelationship of the antioxidant vitamins and antioxidant enzymes, and their overall effect on regulation of oxidative stress induced by haloperidol as compared to olanzapine were analyzed in present study.
  
  
  METHODS
  It was an open randomized cross sectional study that consisted of two groups of fifty schizophrenic patients treated by haloperidol and olanzapine, respectively for at least six months.
  
  
  METHODS
  Serum thiobarbituric acid reacting substances (TBARS) was selected as marker of lipid peroxidation, whereas, serum tocopherols, plasma ascorbate and plasma superoxide dismutase (SOD) activity, were selected to assess the antioxidant vitamin and antioxidant enzyme status, respectively. All measurements were done by standard photometric methods.
  
  
  METHODS
  Statistical analysis was performed to find out the significance for the differences of means between two groups. Bivariate and partial correlation coefficients for assessing the interrelationship between different parameters were done by using statistical package for social sciences (SPSS) software.
  
  
  RESULTS
  Results showed significantly higher serum TBARS and lower antioxidant values in the haloperidol treated patients. Significant positive correlations among the individual antioxidant parameters and significant negative correlation between all of the antioxidant parameters and serum TBARS were found only in haloperidol treated patients. Plasma SOD activity correlated to plasma ascorbate in both groups. Partial correlation results revealed that the serum tocopherol decreased linearly with an increase in serum TBARS significantly in olanzapine treated patients when effect of plasma ascorbate was controlled.
  
  
  CONCLUSIONS
  Haloperidol caused more oxidative stress along with a significant reduction of important antioxidant parameters. Plasma ascorbate was found to be the chief antioxidant on which the activity of both plasma SOD and alpha tocopherol were dependent under oxidative stressful conditions.
authors.affiliation: Department of Psychiatry, Burdwan Medical College, Burdwan - 713 104, West Bengal, India.
authors.forename: Om Prakash
authors.initials: OP
authors.lastname: Singh
authors.forename: Indranil
authors.initials: I
authors.lastname: Chakraborty
authors.forename: Anindya
authors.initials: A
authors.lastname: Dasgupta
authors.forename: Subinay
authors.initials: S
authors.lastname: Datta