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NF-κB is a critical regulator of the survival of rodent and human hepatic myofibroblasts

Lookup NU author(s): Dr Martha Watson, Dr Karen Wallace, Dr Roben Gieling, Professor Derek Manas, Professor Derek Mann, Professor Fiona Oakley

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Abstract

Background/Aims: Hepatic myofibroblast activation during injury causes deposition of extracellular matrix within the liver and promotes development of fibrosis. Hepatic myofibroblast apoptosis is associated with remodelling of fibrotic extracellular matrix and regression of fibrosis. Previous work showed that inhibition of constitutive NF-κB signaling promotes hepatic myofibroblast apoptosis and resolution of fibrosis in rodent models. However, to date agents used to target constitutive NF-κB transcriptional activity in hepatic myofibroblasts have been relatively non-specific with potential for off-target effects that may complicate data interpretation. Likewise, rat chronic liver disease models may not accurately recapitulate the activation of human hepatic myofibroblasts. Methods: We used a mutant recombinant IκBα super-repressor fused to the HIV-TAT domain to specifically target NF-κB signaling in hepatic myofibroblasts. Inhibition of NF-κB activity was measured using reporter assay. Apoptosis of hepatic myofibroblasts was assessed by morphological changes, cleavage of the PARP-1 protein and Caspase 3 activation. Results: TAT-IκBαSR reduced NF-κB dependent transcription, Bcl-2 expression and promoted Jun-N-terminal kinase-dependent apoptosis in human and rat hepatic myofibroblasts. Conclusions: These data highlight the conserved role of NF-κB during fibrogenesis. Our data validate the use of rodent models for pre-clinical testing of NF-κB inhibitors as anti-fibrotics and stimulators of fibrotic extracellular matrix remodelling. © 2008 European Association for the Study of the Liver.


Publication metadata

Author(s): Watson MR, Wallace K, Gieling RG, Manas DM, Jaffray E, Hay RT, Mann DA, Oakley F

Publication type: Article

Publication status: Published

Journal: Journal of Hepatology

Year: 2008

Volume: 48

Issue: 4

Pages: 589-597

ISSN (print): 0168-8278

ISSN (electronic): 1600-0641

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.jhep.2007.12.019

DOI: 10.1016/j.jhep.2007.12.019

PubMed id: 18279996


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