Inhibition of Inhibitor of κB Kinases Stimulates Hepatic Stellate Cell Apoptosis and Accelerated Recovery From Rat Liver Fibrosis

  1. Lookup NU author(s)
  2. Dr Fiona Oakley
  3. Dr Carlyn Marek
  4. Professor Matthew Wright
  5. Professor Derek Mann
Author(s)Oakley F, Meso M, Iredale JP, Green K, Marek CJ, Zhou X, May MJ, Millward-Sadler H, Wright MC, Mann DA
Publication type Article
JournalGastroenterology
Year2005
Volume128
Issue1
Pages108-120
ISSN (print)0016-5085
ISSN (electronic)1528-0012
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
BACKGROUND & AIMS: Resolution of liver fibrosis is associated with clearance of hepatic myofibroblasts by apoptosis; development of strategies that promote this process in a selective way is therefore important. The aim of this study was to determine whether the inhibitor of kappaB kinase suppressor sulfasalazine stimulates hepatic myofibroblast apoptosis and recovery from fibrosis. METHODS: Hepatic myofibroblasts were generated by culture activation of rat and human hepatic stellate cells. Fibrosis was established in rat livers by chronic injury with carbon tetrachloride followed by recovery with or without sulfasalazine (150 mg/kg) treatment. RESULTS: Treatment of hepatic stellate cells with sulfasalazine (0.5-2.0 mmol/L) induced apoptosis of activated rat and human hepatic stellate cells. A single in vivo administration of sulfasalazine promoted accelerated recovery from fibrosis as assessed by improved fibrosis score, selective clearance of smooth muscle alpha-actin-positive myofibroblasts, reduced hepatic procollagen I and tissue inhibitor of metalloproteinase 1 messenger RNA expression, and increased matrix metalloproteinase 2 activity. Mechanistic studies showed that sulfasalazine selectively blocks nuclear factor-kappaB-dependent gene transcription, inhibits hepatic stellate cell expression of Gadd45beta, stimulates phosphorylation of Jun N-terminal kinase 2, and promotes apoptosis by a mechanism that is prevented by the Jun N-terminal kinase inhibitor SP600125. As further evidence for a survival role for the inhibitor of kappaB kinase/nuclear factor-kappaB pathway in activated hepatic stellate cells, a highly selective cell-permeable peptide inhibitor of kappaB kinase activation also stimulated hepatic stellate cell apoptosis via a Jun N-terminal kinase-dependent mechanism. CONCLUSIONS: Inhibition of the inhibitor of kappaB kinase/nuclear factor-kappaB pathway is sufficient to increase the rate at which activated hepatic stellate cells undergo apoptosis both in vitro and in vivo, and drugs that selectively target inhibitor of kappaB kinase have potential as antifibrotics.
PublisherWB Saunders Co.
URLhttp://dx.doi.org/10.1053/j.gastro.2004.10.003
DOI10.1053/j.gastro.2004.10.003
Actions    Link to this publication
Share