Circulating T- and B-cell abnormalities in cutaneous lupus erythematosus

Area of Science:

• Immunology
• Dermatology
• Rheumatology

Background:

• Lupus erythematosus encompasses various autoimmune conditions, including subacute cutaneous lupus erythematosus (SCLE) and discoid lupus erythematosus (DLE).
• Understanding immune cell abnormalities in different lupus erythematosus subtypes is crucial for disease management.

Purpose of the Study:

• To investigate circulating peripheral blood T and B cell populations and immunoglobulin (Ig) synthesis in patients with SCLE and DLE.
• To compare immune cell profiles between SCLE, DLE, and healthy controls.

Main Methods:

• Analysis of T and B cell subsets, Ig synthesizing cells, and Ig secreting cells in peripheral blood.
• Comparison of cell counts and percentages between 7 SCLE patients, 11 DLE patients, and 17 matched controls.
• Correlation analysis between B-cell activation markers, clinical criteria for systemic lupus erythematosus (SLE), and treatment/phenotype in DLE patients.

Main Results:

• SCLE patients exhibited decreased OKT8+ T-cells and increased circulating B cells.
• Both SCLE and DLE patients showed a significant increase in Ig synthesizing and secreting cells.
• A correlation was observed between B-cell activation and the number of SLE classification criteria in DLE patients.

Conclusions:

• Abnormalities in B-cell function, similar to those in systemic lupus erythematosus (SLE), are present in SCLE and DLE.
• These findings highlight potential B-cell pathway involvement even in lupus erythematosus with predominantly cutaneous manifestations.