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Clinical & Experimental Metastasis

, Volume 28, Issue 8, pp 851–863 | Cite as

Reactive oxygen species-mediated PKC and integrin signaling promotes tumor progression of human hepatoma HepG2

  • Chi-Tan Hu
  • Jia-Ru Wu
  • Chuan-Chu Cheng
  • Sindy Wang
  • Hsiao-Ting Wang
  • Ming-Che Lee
  • Ling-Jung Wang
  • Siou-Mei Pan
  • Tsu-Yao Chang
  • Wen-Sheng Wu
Research paper

Abstract

The poor prognosis and recurrence of HCC are majorly caused by intrahepatic metastasis. Delineating the molecular pathways mediating these processes may benefit developing effective targeting therapies. Using human hepatoma HepG2 as a model, we have found reactive oxygen species (ROS) may cooperate with protein kinase C (PKC) for sustained ERK phosphorylation and migration of HepG2 induced by 12-O-tetradecanoyl-phorbol-13-acetate (TPA). We further investigated whether integrin signaling is involved. Various antagonists of integrin signaling prevented TPA-induced activation of ERK and PKC, ROS generation and migration of HepG2. On the other hand, TPA-induced phosphorylation of integrin signaling components including focal adhesion kinase (FAK), Src (Tyr416) and paxillin (Tyr31 and Ser178) can be prevented by PKC inhibitor Bisindolylmaleimides (BIS) and antioxidant dithiotheritol (DTT). HepG2 overexpressing PKCα contained elevated phosphorylated paxillin. Also, ROS generator phenazine methosulfate and tert-Butyl hydroperoxide may induce phosphorylation of paxillin and activation of PKC. Taken together, ROS mediated cross talk of PKC and integrin for migration of HepG2 induced by TPA. Furthermore, TPA induced intrahepatic metastasis of HepG2 in SCID mice, which was prevented by BIS or (BIS plus DTT). Elevated phosphorylation of paxillin was observed in tumor of mice treated with TPA as compared with those co-treated with TPA/BIS. In summary, the signal pathways for tumor progression of hepatoma induced by TPA can be established both in vitro and in vivo.

Keywords

ROS PKC Integrin Paxillin ERK Migration Intrahepatic metastasis 

Abbreviations

TPA

Tetradecanoyl phorbol acetate

PKC

Protein kinase C

ROS

Reactive oxygen species

FAK

Focal adhesion kinase

ERK

Extracellular signal-regulated kinases

BIS

Bisindolylmaleimides

DTT

Dithiotheritol

TBHP

Tert-butyl hydroperoxide

PMS

Phenazine methosulfate

HCC

Hepatocellular carcinoma

IM

Intrahepatic metastasis

HGF

Hepatocyte growth factor

Notes

Acknowledgments

We thank National Science Council in Taiwan and Research Centre of Hepatology in Buddhist Tzu Chi General Hospital for financial support.

Supplementary material

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Chi-Tan Hu
    • 1
  • Jia-Ru Wu
    • 2
  • Chuan-Chu Cheng
    • 2
  • Sindy Wang
    • 2
  • Hsiao-Ting Wang
    • 2
  • Ming-Che Lee
    • 1
  • Ling-Jung Wang
    • 2
  • Siou-Mei Pan
    • 1
  • Tsu-Yao Chang
    • 2
  • Wen-Sheng Wu
    • 2
  1. 1.Research Centre for Hepatology, Department of Internal MedicineBuddhist Tzu Chi General Hospital and Tzu Chi UniversityHualeinTaiwan
  2. 2.Department of Laboratory Medicine and Biotechnology, College of Medicine, Tzu Chi UniversityHualeinTaiwan

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