5-lipoxygenase deficiency reduces hepatic inflammation and tumor necrosis factor alpha-induced hepatocyte damage in hyperlipidemia-prone ApoE-null mice

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
Marcos Martínez-ClementeJoan Clària

Abstract

The actual risk factors that drive hepatic inflammation during the transition from steatosis to steatohepatitis are unknown. We recently demonstrated that hyperlipidemia-prone apolipoprotein E-deficient (ApoE(-/-)) mice exhibit hepatic steatosis and increased susceptibility to hepatic inflammation and advanced fibrosis. Because the proinflammatory 5-lipoxygenase (5-LO) pathway was found to be up-regulated in these mice and given that 5-LO deficiency confers cardiovascular protection to ApoE(-/-) mice, we determined the extent to which the absence of 5-LO would alter liver injury in these mice. Compared with ApoE(-/-) mice, which showed expected hepatic steatosis and inflammation, ApoE/5-LO double-deficient (ApoE(-/-)/5-LO(-/-)) mice exhibited reduced hepatic inflammation, macrophage infiltration, tumor necrosis factor alpha (TNF-alpha), monocyte chemoattractant protein-1 (MCP-1) and interleukin (IL)-18 expression, caspase-3 and nuclear factor-kappaB (NF-kappaB) activities, and serum alanine aminotransferase levels in the absence of changes in hepatic steatosis. The lack of 5-LO produced a remarkable insulin-sensitizing effect in the adipose tissue because peroxisome proliferator-activated receptor gamma, insulin receptor substr...Continue Reading

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