Interferon responses in schizophrenia and major depressive disorders

Area of Science:

• Immunology
• Neuroscience
• Psychiatry

Background:

• Interferon (IFN) production plays a role in immune response.
• Previous studies suggest potential immune dysregulation in psychiatric disorders.

Purpose of the Study:

• To investigate spontaneous and induced interferon production in psychiatric patients.
• To explore the relationship between IFN response patterns and specific psychiatric diagnoses, particularly schizophrenia.
• To identify potential factors in patient plasma that influence IFN production.

Main Methods:

• Whole blood cultures from 45 psychiatric inpatients (32 chronic schizophrenics, 13 severely depressed) and 65 normal controls were stimulated with various inducers (NDV, LPS, PHA+PMA).
• Interferon levels were measured.
• Plasma samples from schizophrenic patients were used to assess their effect on IFN production in normal leukocytes.

Main Results:

• Psychiatric patients showed significantly lower IFN production in response to viral (NDV) and bacterial (LPS) stimuli compared to controls.
• No difference in IFN response was observed for PHA+PMA stimulation.
• Chronic schizophrenics were categorized as high or low IFN responders; high responders had positive symptoms, while low responders had negative symptoms.
• Schizophrenic plasma transferred hypersensitivity to IFN inducers to normal leukocytes.

Conclusions:

• Altered IFN production is associated with psychiatric disorders, especially schizophrenia.
• Specific IFN response patterns correlate with symptom presentation in schizophrenia.
• Factors in schizophrenic plasma, possibly opioid peptides, may modulate cytokine production, including interferons.