Epigenetic deregulation of genes encoded on the X chromosome as reported for CD40L in lupus could explain the female predominance of autoimmune diseases. We compared CD40L expression on CD4+ T cells from primary Sjögren's syndrome (pSS) women and healthy controls and investigated DNA methylation patterns of the promoter and enhancer regions of CD40L. The expression of CD40L on activated CD4+ T cells was higher in patients with pSS than controls after phorbolmyristate acetate and ionomycin activation (P = 0.02). CD40L mRNA level in CD4+ T cells did not differ between patients with pSS and controls and was similar in both groups in cultures treated with the demethylating agent 5-azacytidine C. Pyrosequencing analysis revealed no significant differences in methylation profiles between patients and controls. Inducible membrane-bound CD40L on CD4+ T cells is increased in patients with pSS but was not related to epigenetic deregulation by demethylation patterns of the regulatory regions of CD40L. © 2013 John Wiley & Sons Ltd.
CITATION STYLE
Belkhir, R., Gestermann, N., Koutero, M., Seror, R., Tost, J., Mariette, X., & Miceli-Richard, C. (2014). Upregulation of Membrane-Bound CD40L on CD4+ T cells in Women with Primary Sjögren’s Syndrome. Scandinavian Journal of Immunology, 79(1), 37–42. https://doi.org/10.1111/sji.12121
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