Journal
HEPATOLOGY
Volume 44, Issue 6, Pages 1432-1440Publisher
WILEY
DOI: 10.1002/hep.21436
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Funding
- Wellcome Trust [050443/Z, 068524/Z/02/Z] Funding Source: Medline
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JunD is implicated in the regulation of hepatic stellate cell (HSC) activation and liver fibrosis via its transcriptional regulation of the tissue inhibitor of metalloproteinases-1 (TIMP-1) gene. In the present study we found in vivo evidence of a role for JunD in fibrogenesis. Expression of JunD was demonstrated in alpha-SMA-positive activated HSCs of fibrotic rodents and human livers. The junD(-/-) mice were protected from carbon tetrachloride-induced fibrosis. The livers of injured junD(-/-) mice displayed significantly reduced formation of fibrotic crosslinked collagen and a smaller number of alpha-SMA-positive HSCs compared with those of wild-type (wt) mice. Hepatic TIMP-1 mRNA expression in injured JunD(-/-) mice was 78% lower and in culture activated junD(-/-) HSCs was 50%-80% lower than that in wit mice. In examining the signal transduction mechanisms that regulate JunD-dependent TIMP-1 expression, we found a role for phosphorylation of the Ser 100 residue of JunD but ruled out JNK as a mediator of this event, suggesting ERK1/2 is utilized. In conclusion, a signaling pathway for the development of fibrosis involves the regulation of TIMP-1 expression by phosphorylated JunD.
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