T helper cell dysfunction in systemic lupus erythematosus (SLE): relation to disease activity

Area of Science:

• Immunology
• Rheumatology
• Cellular Biology

Background:

• Systemic lupus erythematosus (SLE) is characterized by immune system dysregulation.
• Defects in T cell-mediated immunity in SLE patients require further clarification regarding disease activity.
• T helper cell (Th) function is crucial for adaptive immunity and its role in SLE pathogenesis is under investigation.

Purpose of the Study:

• To investigate in vitro T helper cell (Th) function in patients with SLE.
• To correlate Th cell function with validated measures of SLE disease activity.
• To identify distinct patterns of Th cell dysfunction in SLE outpatients.

Main Methods:

• Studied 150 SLE outpatients.
• Measured Interleukin 2 (IL-2) production by peripheral blood mononuclear cells (PBMC) after stimulation.
• Stimulants included recall antigens (influenza A virus, tetanus toxoid), allogeneic cells (ALLO), and phytohemagglutinin (PHA).

Main Results:

• Three patterns of Th response were identified: full response (50%), partial response (42%), and non-response (8%).
• Diminished T cell function, particularly non-response to recall antigens, correlated with higher SLE disease activity.
• Immune dysfunction was associated with increased clinical activity indices, independent of medication.

Conclusions:

• SLE patients exhibit diverse defects in T helper cell function.
• These in vitro immune dysfunctions are significantly associated with clinical measures of SLE disease activity.
• The findings highlight a link between specific Th cell defects and lupus disease severity.