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JunD is a profibrogenic transcription factor regulated by Jun N-terminal kinase-independent phosphorylation

Lookup NU author(s): Professor Fiona Oakley, Professor Jelena Mann, Professor Derek Mann

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Abstract

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 wt mice. In examining the signal transduction mechanisms that regulate JunD-dependent TIMP-1 expression, we found a role for phosphorylation of the Ser100 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. Copyright © 2006 by the American Association for the Study of Liver Diseases.


Publication metadata

Author(s): Smart DE, Green K, Oakley F, Weitzman JB, Yaniv M, Reynolds G, Mann J, Millward-Sadler H, Mann DA

Publication type: Article

Publication status: Published

Journal: Hepatology

Year: 2006

Volume: 44

Issue: 6

Pages: 1432-1440

ISSN (print): 0270-9139

ISSN (electronic): 1527-3350

Publisher: John Wiley & Sons, Inc.

URL: http://dx.doi.org/10.1002/hep.21436

DOI: 10.1002/hep.21436

PubMed id: 17133482


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