Primary Sjogren syndrome: clinical and immunopathologic features

Area of Science:

• Immunology
• Rheumatology
• Pathology

Background:

• Primary Sjogren syndrome is an autoimmune disease characterized by lymphocytic infiltration of exocrine glands, leading to dry eyes (keratoconjunctivitis sicca) and dry mouth (xerostomia).
• The condition presents a wide spectrum of extraglandular manifestations due to lymphoid infiltration in various organs.
• Distinguishing primary from secondary Sjogren syndrome can be challenging, especially early in the disease course.

Purpose of the Study:

• To present clinical and laboratory features of 60 primary Sjogren syndrome patients.
• To characterize the infiltrating lymphocytes in affected tissues to understand pathogenesis.
• To evaluate the utility of immunohistologic techniques in differentiating benign lesions from lymphomas.

Main Methods:

• Retrospective analysis of clinical and laboratory data from 60 primary Sjogren syndrome patients.
• Characterization of lymphocytes in salivary glands and lymph nodes using monoclonal antibodies and functional assays.
• Immunohistologic examination to differentiate benign, pseudolymphoma, and non-Hodgkin lymphoma lesions.

Main Results:

• Patients exhibited a broad range of extraglandular features affecting lungs, kidneys, skin, and other organs.
• Infiltrates predominantly consisted of T cells with helper/inducer activity and activation antigens.
• Immunohistology effectively distinguished T-cell-predominant benign/pseudolymphoma lesions from B-cell-predominant non-Hodgkin lymphomas.

Conclusions:

• Primary Sjogren syndrome encompasses diverse extraglandular manifestations requiring comprehensive management.
• Infiltrating lymphocytes in Sjogren syndrome are primarily activated T cells.
• Immunohistologic analysis is crucial for accurate diagnosis and classification of lymphoid infiltrates.