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IL-25 exacerbates autoimmune aortitis in IL-1 receptor antagonist-deficient mice.

Sci Rep. 2019 Nov 19;9(1):17067
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摘要


IL-25, a member of the IL-17 family of cytokines, is known to enhance type 2 immune responses, but suppress type 3 (IL-17A)-mediated immune responses. Mice deficient in IL-1 receptor antagonist (Il1rn-/- mice) have excessive IL-1 signaling, resulting in spontaneous development of IL-1-, TNF- and IL-17A-dependent aortitis. We found that expression of II25 mRNA was increased in the aortae of Il1rn-/- mice, suggesting that IL-25 may suppress development of IL-1-, TNF- and IL-17A-dependent aortitis in Il1rn-/- mice by inhibiting type 3-mediated immune responses. However, we unexpectedly found that Il25-/-Il1rn-/- mice showed attenuated development of aortitis, accompanied by reduced accumulation of inflammatory cells such as dendritic cells, macrophages and neutrophils and reduced mRNA expression of Il17a and Tnfa-but not Il4 or Il13-in local lesions compared with Il1rn-/- mice. Tissue-, but not immune cell-, derived IL-25 was crucial for development of aortitis. IL-25 enhanced IL-1β and TNF production by IL-25 receptor-expressing dendritic cells and macrophages, respectively, at inflammatory sites of aortae of Il1rn-/- mice, contributing to exacerbation of development of IL-1-, TNF- and IL-17A-dependent aortitis in those mice. Our findings suggest that neutralization of IL-25 may be a potential therapeutic target for aortitis.

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