Inhibition of P2RX7 contributes to cytotoxicity by suppression of glycolysis and AKT activation in human hepatocellular carcinoma.

Abstract

Hepatocellular carcinoma (HCC) is the most common form of primary liver cancer. HCC occurs people with chronic liver diseases. The purinergic receptor P2X 7 (P2RX7) is involved in tumor proliferation and growth. Also, P2RX7 is associated with tumor invasion and metastatic dissemination. High glucose utilization is important for the survival of various types of tumors. However, the role of P2RX7 in glucose metabolism and cellular survival of HCC remains unclear. Here, our results show that the gene and protein levels of P2RX7 were elevated in tumor cells of patients with HCC. The pharmacological inhibition of P2RX7 by A-804598, a selective P2RX7 antagonist, and genetic inhibition by P2RX7 knockdown suppressed the glycolytic activity by reduction of hexokinase 2 (HK2), a key enzyme of the glycolysis pathway, in human HCC cells. Also, both A-804598 treatment and P2RX7 knockdown induced cytotoxicity via inhibition of AKT activation which is critical for tumor cell survival in human HCC cells. Moreover, A-804598 treatment and P2RX7 knockdown increased cytotoxicity and caspase-3 activation in human HCC cells. These results suggest that inhibition of P2RX7 contributes to cytotoxicity by suppression of glycolysis and AKT activation in human HCC.