Serum glycoprotein markers in non-alcoholic steatohepatitis and hepatocellular carcinoma

Abstract

Fatty liver disease progresses through stages of fat accumulation and inflammation to non-alcoholic steatohepatitis (NASH), fibrosis and cirrhosis and eventually hepatocellular carcinoma (HCC). Currently available diagnostic tools for HCC lack sensitivity and specificity and deliver little value to patients. In this study, we investigated the use of circulating serum glycoproteins to identify a panel of potential prognostic markers that may be indicative of progression from the healthy state to NASH and further to HCC. Serum samples were processed using a standard pre-analytical sample preparation protocol and were analyzed using a novel high throughput glycoproteomics platform. We analyzed 413 glycopeptides, representing 57 abundant serum proteins and compared among the three phenotypes. Our initial dataset contained healthy, NASH, and HCC serum samples. We analyzed normalized abundance of common glycoforms and found 40 glycopeptides with statistically significant differences in abundances in NASH and HCC compared to controls. Summary level relative abundance of core-fucosylated, sialylated and branched glycans containing glycopeptides were higher in NASH and HCC as compared to controls. We replicated some of our findings in an independent set of samples of individuals with benign liver conditions and HCC, respectively. Our results may be of value in the management of liver diseases. TOC only O_FIG O_LINKSMALLFIG WIDTH=200 HEIGHT=95 SRC="FIGDIR/small/462486v2_ufig1.gif" ALT="Figure 1"> View larger version (14K): org.highwire.dtl.DTLVardef@91672corg.highwire.dtl.DTLVardef@cad49org.highwire.dtl.DTLVardef@4496b9org.highwire.dtl.DTLVardef@103615c_HPS_FORMAT_FIGEXP M_FIG C_FIG