Lack of hepatic c-Met and gp130 expression is associated with an impaired antibacterial response and higher lethality after bile duct ligation

Lab Invest. 2012 Dec;92(12):1726-37. doi: 10.1038/labinvest.2012.122. Epub 2012 Sep 17.

Abstract

The prognosis of liver failure is often determined by infectious and cholestatic complications. As HGF/c-Met and interleukin (IL)-6/gp130 control hepatic cytoprotective pathways, we here investigated their cooperative role during the onset of cholestatic liver injury. Conditional hepatocyte-specific ((Δhepa)) c-Met, gp130 and c-Met/gp130 knockout mice (Cre-loxP system) were subjected to bile duct ligation (BDL) and lipopolysaccharide (LPS) stimulation. gp130(Δhepa) and c-Met/gp130(Δhepa) mice displayed increased lethality associated with severe bacteraemia early after BDL, whereas c-Met(Δhepa) and wild-type mice showed normal survival. Analysis of the innate immune response and the regulation of hepatic antibacterial pathways showed that the LPS-triggered hepatocellular response via the Toll-like receptor-4 pathway was regulated differentially by HGF/c-Met and IL-6/gp130. Activation of p38MAPK, c-Jun N-terminal kinase and signalling transducer and activator of transcription-3 was impaired in gp130(Δ) and c-Met(Δhepa) livers. In addition, the acute-phase response (APR) was reduced in c-Met(Δhepa) livers, whereas gp130(Δhepa) displayed a completely abolished APR. In contrast, TNF-α-dependent NF-κB activation was enhanced in gp130(Δhepa) and c-Met(Δhepa) mice and it was associated with a higher rate of apoptosis and inflammation. Moreover, expression of the neutrophil produced and secreted cathelin-related antimicrobial peptide and of genes related to the inflammasome complex correlated with the strength of the bacterial infection and with TNF-α expression. In conclusion, Gp130 and c-Met are involved in the hepatic antibacterial and innate immune response, control the APR and thus prevent sepsis and liver injury during cholestatic conditions.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acute-Phase Reaction / metabolism
  • Animals
  • Antimicrobial Cationic Peptides
  • Apoptosis / physiology
  • Bacteremia / metabolism*
  • Bacteremia / microbiology
  • Bacterial Load
  • Bile Ducts / metabolism*
  • Bile Ducts / microbiology
  • Bile Ducts / surgery*
  • Cathelicidins / genetics
  • Cathelicidins / metabolism
  • Cell Proliferation
  • Cholestasis / metabolism
  • Cytokine Receptor gp130 / deficiency*
  • Cytokine Receptor gp130 / genetics
  • Cytokine Receptor gp130 / metabolism
  • Immunity, Innate / physiology
  • Kaplan-Meier Estimate
  • Ki-67 Antigen / genetics
  • Ki-67 Antigen / metabolism
  • Ligation
  • Lipopolysaccharides / pharmacology
  • Liver / injuries
  • Liver / metabolism*
  • Liver / microbiology
  • Liver / pathology
  • Mice
  • Mice, Knockout
  • Myeloid Differentiation Factor 88 / genetics
  • Myeloid Differentiation Factor 88 / metabolism
  • Proto-Oncogene Proteins c-met / deficiency*
  • Proto-Oncogene Proteins c-met / genetics
  • Proto-Oncogene Proteins c-met / metabolism
  • Toll-Like Receptor 4 / genetics
  • Toll-Like Receptor 4 / metabolism

Substances

  • Antimicrobial Cationic Peptides
  • Cathelicidins
  • Il6st protein, mouse
  • Ki-67 Antigen
  • Lipopolysaccharides
  • Myd88 protein, mouse
  • Myeloid Differentiation Factor 88
  • Tlr4 protein, mouse
  • Toll-Like Receptor 4
  • Cytokine Receptor gp130
  • Proto-Oncogene Proteins c-met