Na+/K+-ATPase α1 subunit, a novel therapeutic target for hepatocellular carcinoma

• Published in: Oncotarget Vol. 6; no. 29; pp. 28183 - 28193
• Main Authors: Zhuang, Liping, Xu, Litao, Wang, Peng, Jiang, Yan, Yong, Pan, Zhang, Chenyue, Zhang, Haibin, Meng, Zhiqiang, Yang, Peiying
• Format: Journal Article
• Language: English
• Published: United States Impact Journals LLC 29-09-2015
• Subjects: Acetylcysteine - pharmacology; Apoptosis - drug effects; Apoptosis - genetics; Blotting, Western; Carcinoma, Hepatocellular - drug therapy; Carcinoma, Hepatocellular - genetics; Carcinoma, Hepatocellular - metabolism; Cell Cycle Checkpoints - drug effects; Cell Cycle Checkpoints - genetics; Cell Line, Tumor; Cell Movement - drug effects; Cell Movement - genetics; Cell Proliferation - drug effects; Cell Proliferation - genetics; Free Radical Scavengers - pharmacology; Gene Expression Regulation, Neoplastic - drug effects; Gene Expression Regulation, Neoplastic - genetics; Hep G2 Cells; Humans; Liver Neoplasms - drug therapy; Liver Neoplasms - genetics; Liver Neoplasms - metabolism; Molecular Targeted Therapy; Reactive Oxygen Species - antagonists & inhibitors; Reactive Oxygen Species - metabolism; Research Paper; Reverse Transcriptase Polymerase Chain Reaction; RNA Interference; Sodium-Potassium-Exchanging ATPase - antagonists & inhibitors; Sodium-Potassium-Exchanging ATPase - genetics; Sodium-Potassium-Exchanging ATPase - metabolism; subunit; Na+/K+-ATPase; hepatocellular carcinoma; oxidative stress
• ISSN: 1949-2553; 1949-2553
• DOI: 10.18632/oncotarget.4726

We aimed to identify the expression patterns of Na+/K+-ATPase (NKA) α subunits in human hepatocellular carcinoma (HCC) samples and evaluate these subunits as potential targets for HCC treatment. The mRNA expression profiles of NKA α subunits in human HCC samples were analyzed. We found that the mRNA expression for NKA α1 subunit (ATP1A1) was higher than that for other NKA α subunits. Also, ATP1A1 gene expression was markedly higher in HCC samples than in adjacent nontumor tissue samples. Western blotting data suggested that 6 of 14 (43%) HCC samples had elevated ATP1A1 protein expression. Furthermore, knockdown of ATP1A1 expression in human HCC HepG2 and MHCC97H cells markedly reduced their proliferation in vitro and suppressed the tumorigenicity of MHCC97H cells in vivo. Downregulation of ATP1A1 expression resulted in cell-cycle arrest at G2/M phase and apoptosis in HepG2 cells as well as decreased migration in Hep3B cells. We further validated that ATP1A1 downregulation caused intracellular accumulation of reactive oxygen species. Pretreatment with N-acetyl cysteine blocked cell-growth inhibition induced by ATP1A1 downregulation. Collectively, these data suggested that targeting ATP1A1 is a novel approach to the treatment of HCC.