Proteomic study of hepatocellular carcinoma using a novel modified aptamer-based array (SOMAscan™) platform

Area of Science:

• Proteomics and Cancer Biology

Background:

• Vascular invasion is a key indicator of poor prognosis in hepatocellular carcinoma (HCC), correlating with early recurrence and reduced survival post-resection.
• Understanding the proteomic differences between tumor and non-tumor tissues is crucial for identifying mechanisms of HCC carcinogenesis and vascular invasion.

Purpose of the Study:

• To investigate the proteomic profiles associated with HCC carcinogenesis and vascular invasion using a novel aptamer-based array.
• To identify potential protein biomarkers for HCC progression and vascular invasion.

Main Methods:

• Employed a modified aptamer-based array (SOMAscan) platform to quantitatively assess the expression levels of 1129 proteins.
• Analyzed proteomic data from tumor and non-tumor tissues using correlation matrix, comparative studies, Gene Ontology, and network analyses.
• Validated findings with western blotting for specific protein levels.

Main Results:

• Significant differences in proteomic features were observed between HCC tumor and non-tumor tissues, with tumor tissues exhibiting more heterogeneous proteomes.
• Identified 68 differentially expressed proteins between tumor and non-tumor tissues, and eight proteins associated with vascular invasion.
• Network analysis highlighted seven key proteins (AKT1, MDM2, PTEN, FGF1, MAPK8, PRKCB, and FN1) involved in cancer pathways. Only FN1 levels were concordant between SOMAscan and western blotting.

Conclusions:

• The SOMAscan platform effectively captured proteomic signatures relevant to HCC carcinogenesis and vascular invasion.
• The identified differentially expressed proteins, particularly those linked to vascular invasion and cancer pathways, represent promising candidates for further research into HCC mechanisms and clinical applications.