Sex hormones and peripheral white blood cell subsets in systemic lupus erythematosus patients.

BACKGROUND

Systemic Lupus Eyrythematosus (SLE) is an autoimmune disease characterized by antibodies to nuclear antigens, particularly anti-dsDNA. Imbalance between production and destruction of immune cells causes cytopenia. Sex hormones have immunomodulatory effects; estrogen increases the production of autoantibodies in SLE prone NZB/NZW mice.

OBJECTIVE

To investigate the relationship between sex hormones, anti-dsDNA, and lymphocyte subsets in Iranian patients with SLE.

METHODS

38 SLE patients (28 females and 10 males) meeting 4 of 11 ACR revised criteria for SLE classification, and 20 age and sex matched healthy individuals (10 females and 10 males) participated in this study. Lymphocyte subsets were analyzed using flow cytometric analysis. Serum anti-dsDNA levels and sex hormones concentrations were determined using commercial ELISA and RIA kits, respectively.

RESULTS

The absolute count of white blood cells, lymphocytes, T lymphocytes (CD3+), T helper cells (CD3+CD4+), B cells (CD19+) and Nk cells (CD3- CD16+CD56+) in SLE patients diminished significantly in comparison to control group (p<0.05). IgG anti-dsDNA antibody levels were significantly higher in patients compared to controls as expected (p<0.05). Prolactin increased significantly, while DHEAS showed a significant decrease in SLE patients compared with the controls (p<0.05), however the level of estrogen did not have any significant difference in SLE patients in comparison to controls.

CONCLUSION

Increased concentration of prolactin together with a simultaneous decrease in serum DHEAS in SLE patients are associated with anti-dsDNA elevation and a decrease in almost all lymphocyte subsets.