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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

IL-10 gene knockout mice show enhanced Th1-like protective immunity and absent granuloma formation following Chlamydia trachomatis lung infection.

We previously reported that higher IL-10 production is correlated with lower IFN-gamma production, weaker delayed hypersensitivity (DTH), and slower organism clearance following chlamydial infection in mice. To assess more directly the role of IL-10, we examined protective immunity and pathological reaction in C57BL/6 IL-10 gene knockout (KO) and wild-type mice. The results showed that in the absence of endogenous IL-10, mice had significantly accelerated chlamydial clearance and developed significantly stronger DTH responses, which could be inhibited by local delivery of rIL-10. Consistent with the enhancement of DTH responses, IL-10 KO mice showed stronger and more persistent CD4 T cell-dependent IFN-gamma production and significant elevation of IL-12 and TNF-alpha production. Additionally, wild-type, but not IL-10 KO, mice showed granuloma formation that was correlated with higher levels of Th2 cytokine (IL-5) production at the later stages of infection. Moreover, chlamydial infection, unlike parasitic protozoan infection, did not induce significant acute toxicity in IL-10 KO mice, which may be due to the low (undetectable) levels of systemic release of proinflammatory cytokines. These results suggest that IL-10 inhibits the priming and expansion of Th1-like T cell responses and that IL-10 plays a role in the fibrotic reaction seen with chlamydial infection.[1]


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