Caveolin enhances hepatocellular carcinoma cell metabolism, migration, and invasion in vitro via a hexokinase 2-dependent mechanism.

Abstract

The development and progression of hepatocellular carcinoma (HCC) have been associated with abnormal cellular metabolism. Gene Expression Profiling Interactive Analysis RNA sequencing data revealed caveolin-1 (CAV-1) and hexokinase 2 (HK2) messenger RNA (mRNA) were significantly upregulated in human HCC compared with normal tissues, and high HK2 expression was associated with significantly poorer overall survival in HCC ( p < 0.05). CAV-1 and HK2 mRNA and protein expression were upregulated and positively correlated in 42 fresh human HCC tissues compared with tumor-adjacent normal tissues. Overexpression of CAV-1 or HK2 in SMMC-7721 and HepG2 HCC cells enhanced glucose and lactate metabolism and increased cell migration and invasion in transwell assays; knocking down CAV-1 or HK2 had the opposite effects. Overexpression of CAV-1 increased HK2 expression; overexpression of HK2 did not affect CAV-1 expression. Knocking down HK2 partially reversed the ability of CAV-1 to promote cellular metabolism, invasion, and migration in HCC, indicating CAV-1 enhances glycolysis, invasion, and metastasis in HCC cells via HK2-dependent mechanism. Further studies of the function and relationship between CAV-1 or HK2 expression are warranted to explore the potential of these proteins as metabolic targets for the treatment of HCC.