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Monocyte function in systemic lupus erythematosus.

J Boswell¹, P H Schur

¹Department of Rheumatology/Immunology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115.

Clinical Immunology and Immunopathology

|August 1, 1989

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Systemic lupus erythematosus (SLE) involves immune cell defects. Lupus patients have more monocytes, which are less effective at phagocytosis, potentially impacting disease progression.

Area of Science:

Immunology
Rheumatology
Cell Biology

Background:

Systemic lupus erythematosus (SLE) is an autoimmune disease marked by immune system dysregulation.
Defects in B and T lymphocyte function are hallmarks of SLE.
Monocytes play a crucial role in immune responses and may influence SLE pathogenesis.

Purpose of the Study:

To investigate monocyte function in patients with SLE compared to healthy controls.
To assess monocyte number, IgG synthesis modulation, phagocytosis, and acid phosphatase activity in SLE.
To determine if observed monocyte differences correlate with SLE progression.

Main Methods:

Enumeration of monocytes and mononuclear cells.
Measurement of IgG synthesis modulation by monocytes.

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Main Results:

SLE patients exhibited increased monocyte and mononuclear cell numbers.
Mononuclear cells from SLE patients produced higher levels of IgG.
Monocytes from SLE patients demonstrated reduced phagocytic capacity compared to controls.
Acid phosphatase activity was comparable between SLE and normal monocytes.
LPS stimulation enhanced phagocytosis in normal monocytes but not in SLE monocytes.

Conclusions:

Increased monocyte numbers and subtle functional alterations, particularly reduced phagocytosis, are observed in SLE patients.
These monocyte characteristics may contribute to the pathogenesis and progression of systemic lupus erythematosus.
Further research into monocyte-targeted therapies could be beneficial for SLE management.