Poole, Edilson Torres-Gonzalez, Robin H. Schmidt, Michael L. Merchant, Keith C. Falkner, Jeffrey D. Ritzenthaler, Gavin E. Arteel

Background: Fatty liver patients were found to have bacterial overgrowth and increased permeability in gut, patients with inflammatory bowel disease were also found to have hepa-tobiliary disorders SB431542 supplier frequently, indicating the importance of gut-liver axis. However, the effects of colitis on liver fibrosis remain unclear. The aim of this study is to investigate the role of murine chronic colitis induced by dextran sodium sulfate (DSS) in hepatic fibrogenesis. Methods: Male C57BL/6 mice were randomly divided into five groups: Control group (n=10), DSS group (n=10), Olive oil group (n=10), CCl4 group (n=10) and CCl4+DSS group (n=10). Severity of colitis was evaluated by disease activity index (DAI), gross score, myeloperoxidase (MPO) activity and histology. Bacterial translocation and serum LPS level were also checked. Pro-inflammatory cytokines including TNF-α, IFNγ, IL-17A and tight junction (TJ) proteins in the colon mucosa were also checked by immunohistochemistry, western blot and real-time Q-PCR, respectively. Haematoxylin and eosin staining (H&E staining), Sirius red staining and Mas-son’s trichrome staining (MT

staining) were used to evaluate liver histopathology and fibrosis. Serological tests were used to observe liver function. The protein and mRNA expressions of TNF-α, IFNγ, IL-17A, TGF-β1, α-SMA, collagen type I and III, MMP-2, TIMP-2, TLR4, TRAF6 and NF-κB in liver tissues were observed by immunohistochemistry, western Casein kinase 1 blot and real-time Q-PCR, Ensartinib datasheet respectively. Results: DSS administration increased DAI score, gross score and MPO activity, and worsened histologic inflammation. The histological analysis revealed that hepatic inflammation in CCl4+DSS group was significantly aggravated. Meanwhile, increased hepatic fibrosis was observed,

especially in the CCl4+DSS group, accompanied by higher levels of TGF-β1, α-SMA, collagen type I and III, TIMP-2 and lowered MMP-2. Enhanced pro-inflammatory cytokines, bacterial translocation and LPS were also found in the DSS group. And they were significantly higher in the CCl4+DSS group. In line with this, TLR4, TRAF6 and NF-κB were markedly increased in liver tissues. Conclusions: The intestinal inflammation promotes hepatic inflammation and fibrogenesis, probably through LPS/ TLR4 signaling pathway. Disclosures: The following people have nothing to disclose: Xiaolan Zhang, Yufeng Liu, Guo-chao Niu, Libo Zheng “
“Intrahepatic cholangiocarcinoma (ICC) is one of the life-threatening complications of primary sclerosing cholangitis (PSC). However, the incidence of ICC in Japanese PSC patients is low, and the association between the development of ICC and morbidity duration of PSC is largely unknown. Here, we describe a case of ICC that developed after a long-term follow-up of a patient with PSC and ulcerative colitis (UC).