Immune complexes in Sjögren's syndrome.

Area of Science:

• Immunology
• Rheumatology
• Pathology

Background:

• Sjögren's syndrome is an autoimmune disorder characterized by lymphocytic infiltration of exocrine glands.
• Immune complexes are implicated in various autoimmune diseases, but their role in Sjögren's syndrome is not fully understood.

Purpose of the Study:

• To investigate the presence and significance of immune complexes in patients with Sjögren's syndrome.
• To determine if immune complex levels correlate with disease activity, glandular pathology, or the development of lymphoma.

Main Methods:

• Sera from 48 Sjögren's syndrome patients were analyzed for immune complexes using the Raji cell assay.
• Serum complement levels were assessed.
• Five patients were monitored serially during the progression to pseudolymphoma or malignant lymphoma.

Main Results:

• No correlation was found between immune complex levels and the degree of lymphocytic infiltration in labial salivary glands.
• Serum complement levels were within the normal range for all patients.
• In four of five serially followed patients, immune complex levels remained largely unchanged and did not parallel disease activity, rheumatoid factor, or SS-A/SS-B antibody concentrations.

Conclusions:

• Immune complexes do not appear to be a significant factor correlating with the severity of labial gland infiltration in Sjögren's syndrome.
• Immune complex levels do not consistently track disease activity or the development of lymphoma in this patient cohort.
• The role of immune complexes in the pathogenesis of Sjögren's syndrome warrants further investigation.