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Original Studies |
Research Institute for Endocrinology, Reproduction, and Metabolism (E.J.G., L.J.G.G.), Departments of Pathology (J.C.M.F., B.M.E.B.) and Clinical Chemistry (C.S.), University Hospital Vrije Universiteit, 1007 MB Amsterdam; and Department of Immunology, Erasmus University (H.A.D.), Rotterdam, The Netherlands
Address all correspondence and requests for reprints to: Erik J. Giltay, M.D., Department of Endocrinology, Division of Andrology, University Hospital Vrije Universiteit, P.O. Box 7057, 1007 MB Amsterdam, The Netherlands. E-mail: giltay{at}dds.nl
The female predominance in several autoimmune diseases suggests a role for sex steroid hormones in disease susceptibility. We therefore investigated to what extent sex hormones would influence immune responsiveness. We analyzed T helper type 1 (TH1) and type 2 cytokine patterns, chemokine receptor expression (n = 2 x 10), and Ig levels (n = 2 x 25) in transsexual men and women before and after 4 months of cross-sex hormone administration. Antithyroperoxidase levels were compared between 186 transsexual males (treated >5 yr with estrogens) and 186 male controls.
In men, estrogens plus antiandrogens increased free cortisol levels in
24-h urine samples, decreased natural killer cell numbers, and slightly
inhibited the mitogen-induced interferon-
/interleukin-4 ratio, but
up-regulated the expression of TH1-associated chemokine
receptors, CCR1, CXCR3, and CCR5. Conversely, in women, androgens
slightly decreased free cortisol levels in 24-h urine samples and
enhanced the mitogen-induced interferon-
/interleukin-4 ratio and
tumor necrosis factor-
production. At the single cell level no
TH1/TH2 shifts were found. Remarkably,
up-regulation of TH1 cytokines was accompanied by
down-regulation of CCR1, CXCR3, and CCR5 expression. Neither
CD4+ lymphocyte numbers nor IgG, IgM, and
antithyroperoxidase levels, although higher in women then in men, were
affected by cross-sex hormonal treatment.
These results demonstrate that the capacity to develop a TH1 phenotype of peripheral blood lymphocytes is stimulated by androgens and is slightly inhibited by estrogens. These changes may be direct or indirect through the effects on other hormones.
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