CD4⁺CD25⁻Foxp3⁺ T cells: a marker for lupus nephritis?

Area of Science:

• Immunology
• Autoimmune Diseases
• Nephrology

Background:

• Systemic lupus erythematosus (SLE) is a complex autoimmune disease affecting multiple organs.
• Elevated levels of CD4⁺CD25-Foxp3⁺ T cells have been observed in SLE patients, but their precise role is not fully understood.

Purpose of the Study:

• To investigate the role of CD4⁺CD25-Foxp3⁺ T cells in SLE patients with various organ manifestations.
• To determine the association of these T cells with disease activity, particularly renal involvement.

Main Methods:

• Flow cytometry was used to analyze CD4⁺CD25-Foxp3⁺ T cells in healthy controls and SLE patients.
• These cells were correlated with clinical data, treatment, and disease activity indices.
• Analysis included urine sediment samples from patients with active glomerulonephritis and time course studies post-treatment.

Main Results:

• CD4⁺CD25-Foxp3⁺ T cells were significantly increased in active SLE patients, with most expressing Helios.
• Higher proportions of these T cells were found in SLE patients with kidney involvement.
• These cells were detected in urine sediment and correlated with proteinuria in active glomerulonephritis.

Conclusions:

• CD4⁺CD25-Foxp3⁺ T cells appear to be regulatory, not activated, T cells.
• A significant association exists between CD4⁺CD25-Foxp3⁺ T cells and active nephritis in SLE.
• This T cell population may be a valuable biomarker for recognizing and monitoring SLE patients with kidney disease.