Journal
EUROPEAN JOURNAL OF IMMUNOLOGY
Volume 42, Issue 5, Pages 1294-1303Publisher
WILEY-BLACKWELL
DOI: 10.1002/eji.201142204
Keywords
Cytokine; IL-1 inhibitor; Inflammation; Liver; Necrosis
Categories
Funding
- Swiss National Science Foundation [310030-135195, 310031-134691]
- Rheumasearch Foundation
- Institute of Arthritis Research
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Interleukin-1 receptor antagonist (IL-1Ra) is a specific IL-1 inhibitor that possesses anti-inflammatory activities. Several studies in human and mouse suggested a protective role for IL-1Ra in liver inflammation, and we previously demonstrated that hepatocytes produce high levels of IL-1Ra in response to inflammatory challenge in vitro and in vivo. In the present study, we investigated the production and the biological function of hepatocyte-derived IL-1Ra in concanavalin A (ConA)-induced hepatitis in mice. We show that the injured liver produces large amounts of IL-1Ra and that secreted and intracellular IL-1Ra isoforms are produced with different kinetics during the course of hepatitis. By using hepatocyte-specific IL-1Ra-deficient mice (IL-1Ra?H), we demonstrate that hepatocytes represent the major cellular source of local IL-1Ra. Most interestingly, hepatic necrosis and inflammation were increased in IL-1Ra?H as compared with wild-type mice during the late phase of the disease, leading to a delayed resolution of hepatitis in IL-1Ra?H mice. In conclusion, our results show that the local production of IL-1Ra by hepatocytes contributes to the resolution of hepatitis.
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