IL-10 Polymorphism and Cell-mediated Immune Response to Chlamydia Trachomatis
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Chlamydia trachomatis infection induces an inflammatory response that is crucial in resolving acute infection but may also play a key role in the pathogenesis of C trachomatis associated infertility. The immune response is linked to cytokine secretion pattern which is influenced by the host genetic background. To study a relationship between interleukin-10 (IL-10) promoter -1082 polymorphism and cell-mediated immune response during C trachomatis infection in vitro, lymphocyte proliferation and cytokine (IL-10, IFN-gamma, TNF-alpha, IL-2, IL-4 and IL-5) secretion were analysed in subjects with different IL-10 genotypes. Enhanced IL-10 secretion and reduced antigen-specific lymphocyte proliferative and IFN-gamma responses were found in subjects with IL-10 -1082 GG genotype when compared to those with -1082 AA genotype. CD14+ monocytes were main source of IL-10 indicating that these cells are important regulators of the antigen-specific cell-mediated responses during active C trachomatis infection. We conclude that impaired cell-mediated response to C trachomatis is associated with IL-10 genotype in subjects with high IL-10 producing capacity. A comparison of immune markers between subjects with a history of noncomplicated and complicated infection is needed to further understand the confounding factors associated with the development of C trachomatis associated sequelae.
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