Estrogen modulation of endosome-associated toll-like receptor 8: An IFN伪-independent mechanism of sex-bias in systemic lupus erythematosus

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• 作者：Nicholas A. Young^a ; ^b ; ^f ; Lai-Chu Wu^a ; ^b ; ^f ; Craig J. Burd^c ; ^f ; Alexandra K. Friedman^a ; ^b ; ^f ; Benjamin H. Kaffenberger^a ; ^b ; ^f ; Murugesan V.S. Rajaram^d ; ^e ; ^f ; Larry S. Schlesinger^d ; ^e ; ^f ; Hayley James^g ; Margaret A. Shupnik^g ; Wael N. Jarjour^a ; ^b ; ^f ; ^{Wael.Jarjour@osumc.edu" class="auth_mail}
• 关键词：Estrogen ; Systemic lupus erythematosus ; Toll-like receptor ; Sex-bias ; Autoimmunity
• 刊名：Clinical Immunology
• 出版年：March, 2014
• 年：2014
• 卷：151
• 期：1
• 页码：66-77
• 全文大小：1074 K

文摘

Females of child-bearing age are more resistant to infectious disease and have an increased risk of systemic lupus erythematosus (SLE). We hypothesized that estrogen-induced gene expression could establish an immunoactivated state which would render enhanced defense against infection, but may be deleterious in autoimmune development. Using peripheral blood mononuclear cells (PBMCs), we demonstrate enhanced responses with immunogen stimulation in the presence of 17尾-estradiol (E2) and gene array analyses reveal toll-like receptor 8 (TLR8) as an E2-responsive candidate gene. TLR8 expression levels are up-regulated in SLE and PBMCs stimulated with TLR8 agonist display a female sex-biased, E2-sensitive response. Moreover, we identify a putative ER伪-binding region near the TLR8 locus and blocking ER伪 expression significantly decreases E2-mediated TLR8 induction. Our findings characterize TLR8 as a novel estrogen target gene that can lower the inflammatory threshold and implicate an IFN伪-independent inflammatory mechanism that could contribute to higher SLE incidence in women.