Abstract
Non-alcoholic fatty liver disease is a prevalent problem throughout the western world. Liver sinusoidal endothelial cells (LSEC) have been shown to play important roles in liver injury and repair, but their role in the underlying pathogenetic mechanisms of non-alcoholic fatty liver disease remains undefined. Here, we evaluated the effects of steatosis on LSEC gene expression in a murine model of non-alcoholic fatty liver disease and an immortalized LSEC line. Using microarray we identified distinct gene expression profiles following exposure to free fatty acids. Gene pathway analysis showed a number of differentially expressed genes including those involved in lipid metabolism and signaling and inflammation. Interestingly, in contrast to hepatocytes, fatty acids led to decreased expression of pro-inflammatory chemokines including CCL2 (MCP-1), CXCL10 and CXCL16 in both primary and LSEC cell lines. Chemokine downregulation translated into a significant inhibition of monocyte migration and LSECs isolated from steatotic livers demonstrated a similar shift towards an anti-inflammatory phenotype. Overall, these pathways may represent a compensatory mechanism to reverse the liver damage associated with non-alcoholic fatty liver disease.
Highlights
Non-alcoholic fatty liver disease (NAFLD) is the fastest-growing liver disease in the western world
palmitic acid (PA) (C16:0) and oleic acid (OA) (C18:1) are the most abundant FFA in normal and NAFLD livers, and treatment of hepatocytes with these FFA has been shown to mimic fat over- accumulation in the liver seen in NAFLD [19,20]
Treatment with FFA led to a significant change in 765 gene transcripts (p
Summary
Non-alcoholic fatty liver disease (NAFLD) is the fastest-growing liver disease in the western world. NAFLD represents a disease spectrum that is histologically defined and can range from simple hepatic steatosis to non-alcoholic steatohepatitis (NASH). NASH includes steatosis along with liver inflammation, hepatocyte injury and often fibrosis [1]. The mechanisms that lead to the different pathological outcomes are not well defined but hepatic lipid accumulation, primarily as triacylglycerol (TAG), is a key pathogenic feature of NAFLD [2]. Hepatic TAG synthesis results in part from increased uptake of hepatic fatty acids.
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