Cystathionine γ-Lyase deficiency protects mice from Galactosamine/lipopolysaccharide-induced acute liver failure

Kazuhiro Shirozu, Kentaro Tokuda, Eizo Marutani, David Lefer, Rui Wang, Fumito Ichinose

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50 Citations (Scopus)

Abstract

Aims: Acute liver failure (ALF) is a fatal syndrome attributed to massive hepatocyte death. Hydrogen sulfide (H2S) has been reported to exert cytoprotective or cytotoxic effects. Here, we examined the role of cystathionine γ-lyase (CSE, an enzyme produces H2S) in ALF induced by D-Galactosamine (GalN) and lipopolysaccharide (LPS). Results: Wild-type (WT) mice exhibited high mortality rate, prominent liver injury, and increased plasma alanine aminotransferase levels after GalN/LPS challenge. Congenital deficiency or chemical inhibition of CSE by DL-propargylglycine attenuated GalN/LPS-induced liver injury. CSE deficiency markedly improved survival rate and attenuated GalN/LPS-induced upregulation of inflammatory cytokines and activation of caspase 3 and poly (ADP-ribose) polymerase (PARP) in the liver. CSE deficiency protected primary hepatocytes from GalN/tumor necrosis factor-α (TNF-α)-induced cell death without affecting LPS-induced TNF-α production from primary peritoneal macrophages. Beneficial effects of CSE deficiency were associated with markedly elevated homocysteine and thiosulfate levels, upregulation of NF-E2 p45-related factor 2 (Nrf2) and antioxidant proteins, activation of Akt-dependent anti-Apoptotic signaling, and inhibition of GalN/LPS-induced JNK phosphorylation in the liver. Finally, administration of sodium thiosulfate (STS) attenuated GalN/LPS-induced liver injury via activation of Akt- and Nrf2-dependent signaling and inhibition of GalN/LPS-induced JNK phosphorylation in WT mice. Innovation: These results suggest that inhibition of CSE or administration of STS prevents acute inflammatory liver failure by augmenting thiosulfate levels and upregulating antioxidant and anti-Apoptotic defense in the liver. Conclusion: Congenital deficiency or chemical inhibition of CSE increases thiosulfate levels in the liver and prevents ALF at least in part by augmentation of antioxidant and anti-Apoptotic mechanisms. Antioxid. Redox Signal. 20, 204-216.

Original languageEnglish
Pages (from-to)204-216
Number of pages13
JournalAntioxidants and Redox Signaling
Volume20
Issue number2
DOIs
Publication statusPublished - Jan 13 2014
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Cell Biology
  • Molecular Biology
  • Physiology
  • Clinical Biochemistry

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