This site became the new on June 19th. Learn more.
Show more Menu IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more... Menu IMPORTANT: Talk with a trusted healthcare professional before volunteering for a study. Read more... Menu
Give us feedback

Glutamatergic Amino Acids and Oxytocin Levels in the Plasma of Patients in First Psychotic Episode (FPE)- Before and After Neuroleptic Treatment

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified November 2008 by Shalvata Mental Health Center.
Recruitment status was:  Not yet recruiting
Information provided by:
Shalvata Mental Health Center Identifier:
First received: November 9, 2008
Last updated: November 10, 2008
Last verified: November 2008

The goal of our research is to check the levels of D-Serine, Glycine, and other Glutamatergic amino acids, in patients with First Psychotic Episode (FPE). These patients are in the early stage of the disease, treated with neuroleptics for short periods of time, and are usually hospitalized for the first time. The hypothesis of the research is that we will find low levels of Glycine and D-Serine in these patients. Following an Anti-psychotic treatment we will expect these levels to return to the norm, and that this correction will be accompanied by a reduction of positive and negative symptoms.

In addition, we will check the D-Serine and Glycine levels in the plasma of first degree relatives of the patients and a group of healthy subjects. The results of this study might support the hypothesis that the Glutamatergic system in involved in the pathology of Schizophrenia from it's early stages.

In addition, we will check the levels of Oxytocin and Estrogen in the plasma of patients in FPE. Our hypothesis is that we will find low levels of Estrogen and High levels of Oxytocin in this group of patients. The results of the study might support the hypothesis that Estrogen and Oxytocin are involved in the pathology of Schizophrenia from it's early stages.

Schizophrenia Schizophreniform Schizoaffective Disorder Brief Psychotic Episode

Study Type: Observational
Study Design: Time Perspective: Prospective

Resource links provided by NLM:

Further study details as provided by Shalvata Mental Health Center:

Primary Outcome Measures:
  • Glycine and D-Serine levels in the plasma. [ Time Frame: 6-8 weeks ]

Estimated Enrollment: 80
Study Start Date: January 2009
Estimated Primary Completion Date: July 2010 (Final data collection date for primary outcome measure)
40 subjects in a First Psychotic Episode
20 First Degree relatives
20 Healthy subjects


Ages Eligible for Study:   18 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
Hospitalized patients First degree ralatives Healthy subjects from the community

Inclusion Criteria:

  • Subjects between 18-60 years
  • Clinical Diagnosis of Schizophrenia, Schizophreniphorm disorder, Schizoaffective Disorder, Brief esychotic episode

Exclusion Criteria:

  • two years or more of positive symptoms
  • Neuroleptic treatment for more then twe weeks in the prior month, or for more then six weeks at any time.
  • Drug induced psychotic episode
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00789022

Contact: Uri Nitzan, Md 00-972-9-7478532
Contact: Uriel Levi-Herscho, MD 00-972-2-5316906 uriel heresco-levy []

Shalvata Medical Center Active, not recruiting
Hod Hasharom, Israel
Sponsors and Collaborators
Shalvata Mental Health Center
  More Information

Responsible Party: Dr. Uri Nitzan, Resident Identifier: NCT00789022     History of Changes
Other Study ID Numbers: uriel111
Study First Received: November 9, 2008
Last Updated: November 10, 2008

Keywords provided by Shalvata Mental Health Center:
First-Psychotic-Episode (FPE)
Glutamatergic system

Additional relevant MeSH terms:
Psychotic Disorders
Mental Disorders
Schizophrenia Spectrum and Other Psychotic Disorders
Reproductive Control Agents
Physiological Effects of Drugs processed this record on September 19, 2017