Third complement component in cerebrospinal fluid in neuro-Behçet's syndrome. Conversion patterns by crossed...

Area of Science:

• Neurology
• Immunology
• Biochemistry

Background:

• Neuro-Behçet's syndrome (nB) is a neurological complication of Behçet's disease.
• The role of the complement system in nB pathogenesis is not fully understood.

Purpose of the Study:

• To investigate the presence and significance of complement C3 conversion products in the cerebrospinal fluid (CSF) of nB patients.
• To correlate C3 conversion with inflammatory markers and blood-CSF barrier integrity in nB.

Main Methods:

• Cerebrospinal fluid (CSF) specimens from 10 nB patients were analyzed.
• Crossed immunoelectrophoresis was used to detect C3 and C4 complement protein conversion products.
• Levels of alpha 2-macroglobulin and IgA were measured as indicators of blood-CSF barrier function.

Main Results:

• C3 conversion products were detected in 4 out of 13 CSF specimens from nB patients.
• CSF with C3 conversion showed elevated C3 protein levels and signs of inflammation, including increased alpha 2-macroglobulin and IgA.
• Blood-CSF barrier involvement was indicated by these elevated protein levels.

Conclusions:

• Complement C3 activation and consumption occur in the CSF of some nB patients.
• The alternative complement pathway may be involved in nB pathogenesis.
• C3 conversion in CSF correlates with inflammation and blood-CSF barrier dysfunction in nB.