NCT00960219

D-amino Acid Oxidase Inhibition (DAAOI-1) add-on Treatment for Chronic Schizophrenia

D-amino Acid Oxidase Inhibition for NMDA Modulation in Schizophrenia

• Status: Completed
• Phase: Phase 2
• Study type: Interventional
• Enrollment: 52 (actual)
• Sponsor: China Medical University Hospital · Academic / Other
• Sex: All
• Age: 18 Years – 65 Years
• Healthy volunteers: Not accepted

Summary

Adjuvant N-methyl-D-aspartic acid (NMDA)-enhancing agents, such as GlyT-1 inhibitors and NMDA-glycine site agonists have been demonstrated to be beneficial for chronic schizophrenia patients. The purpose of this study is to evaluate efficacy and safety of add-on treatment of an inhibitor of D-amino acid oxidase (DAAOI), DAAOI-1, in chronically stable schizophrenia patients who have been stabilized with antipsychotics.

Detailed description

The etiology of schizophrenia remains unclear. Schizophrenia patients reveal positive symptoms, negative symptoms, and cognitive impairments. In addition to dopamine system hyperactivity, hypofunction of N-methyl-D-aspartate (NMDA) receptor plays a role in the pathophysiology of schizophrenia. Consequently, enhancing NMDA receptor neurotransmission has been regarded as a novel treatment approach. To date, several reported trials on adjuvant NMDA-enhancing agents, including glycine, D-amino acids (D-serine, D-alanine), and sarcosine (a glycine transporter I inhibitor), revealed beneficial but limited efficacy for positive and negative symptoms. DAAOI-1 is a D-amino acid oxidase (DAAO) inhibitor which can elevate synaptic concentration of D-amino acids. The aim of this project is to examine the efficacy and safety of add-on treatment of DAAOI-1 in chronically stable schizophrenia patients who have been stabilized with antipsychotics. In the study, 60 schizophrenic patients are recruited into the 6-week trial and randomly assigned into the two groups (1 gm/dDAAOI-1, or placebo) with a double-blind manner. Positive and Negative Syndrome Scale (PANSS), Scales for the Assessment of Negative symptoms (SANS), Global Assessment of Function (GAF), quality of life (QOL), Hamilton Depression rating scale 17(HAM-D 17), Clinical Global Impression(CGI)and side effects are evaluated every two weeks during the trial. Cognitive function ("7 domains of Measurement and Treatment Research to Improve Cognition in Schizophrenia" \[MATRICS\])are assessed at weeks 0 and 6. The efficacies of two groups are compared.

Conditions

• Schizophrenias
• Psychoses
• Psychotic Disorders
• Schizophrenic Disorders

Interventions

Type	Name	Description
DRUG	D-amino acid oxidase inhibition (DAAOI-1)	1g/day(500mg BID), oral, for 6 weeks
DRUG	placebo	1# BID, oral, for 6 weeks

Timeline

• Start date: 2009-04-01
• Primary completion: 2011-07-01
• Completion: 2011-07-01
• First posted: 2009-08-17
• Last updated: 2011-07-11

Locations

1 site across 1 country: Taiwan