Abnormal cerebrospinal fluid protein indices in schizophrenia

Area of Science:

• Neuroscience
• Immunology
• Psychiatry

Background:

• Schizophrenia is a complex psychiatric disorder with suspected neuroinflammatory components.
• The integrity of the blood-brain barrier (BBB) and intrathecal immunoglobulin G (IgG) synthesis are potential biomarkers in neurological and psychiatric conditions.

Purpose of the Study:

• To investigate blood-brain barrier (BBB) integrity and central nervous system (CNS) immunoglobulin G (IgG) production in individuals with schizophrenia.
• To assess the prevalence of BBB dysfunction and endogenous IgG synthesis in a cohort of schizophrenia patients.

Main Methods:

• Paired cerebrospinal fluid (CSF) and serum samples were collected from 24 subjects diagnosed with schizophrenia.
• Albumin and IgG levels were quantified in both CSF and serum.
• Calculations were performed to determine BBB permeability index and a measure of selective CNS IgG production.

Main Results:

• Approximately 29% (7 of 24) of subjects exhibited increased BBB permeability.
• Around 33% (8 of 24) of subjects demonstrated elevated endogenous IgG production within the CNS.
• One subject with elevated IgG production also showed oligoclonal banding on CSF protein electrophoresis.

Conclusions:

• A significant proportion of schizophrenia patients display evidence of compromised BBB integrity.
• Elevated intrathecal IgG production suggests active immune responses within the CNS in schizophrenia.
• These findings highlight the potential role of neuroinflammation and BBB dysfunction in the pathophysiology of schizophrenia.