Abstract：
:Chronic liver injury causes liver regeneration, resulting in fibrosis. The proinflammatory cytokine tumor necrosis factor (TNF) is involved in the pathogenesis of many acute and chronic liver diseases. TNF has pleiotropic functions, but its role in liver fibrosis has not been clarified. Chronic repeated injection of CCl4 induces liver fibrosis in mice. We examined whether signaling through TNF receptors was critical for this process, using mice lacking either TNF receptor (TNFR) type 1 or TNFR type 2 to define the pathophysiologic role of TNFR signals in liver fibrosis. Liver fibrosis caused by chronic CCl4 exposure was TNF-dependent; histological fibrosis was seen in wild-type (WT) and TNFR-2 knockout (KO) mice, but not in TNFR-1 KO mice. Furthermore, a marked reduction in procollagen and TGF-beta synthesis was observed in TNFR-1 KO mice, which also had little detectable NF-kappa B, STAT3, and AP1 binding, and reduced levels of liver interleukin-6 (IL-6) mRNA compared to WT and TNFR-2 KO mice. In conclusion, our results indicate the possibility that NF-kappa B, STAT3, and AP1 binding by signals transduced through TNFR-1 plays an important role in liver fibrosis formation.
journal_name
Cytokinejournal_title
Cytokineauthors
Sudo K,Yamada Y,Moriwaki H,Saito K,Seishima Mdoi
10.1016/j.cyto.2004.11.001keywords:
subject
Has Abstractpub_date
2005-03-07 00:00:00pages
236-44issue
5eissn
1043-4666issn
1096-0023pii
S1043-4666(05)00008-6journal_volume
29pub_type
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