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Cardiotonic steroids attenuate ERK phosphorylation and generate cell cycle arrest to block human hepatoma cell growth

Zhong-Wei Xu1, Feng-Mei Wang, Mo-Jie Gao

  • 1Department of Cell Biology, Medical College of the Chinese People's Armed Police Forces, Tianjin City 300162, China.

The Journal of Steroid Biochemistry and Molecular Biology
|January 11, 2011
PubMed

Insights

Cardiotonic steroids (CSs) show anticancer potential by inhibiting hepatoma cell proliferation and inducing apoptosis. These natural compounds target key cell signaling pathways, supporting their development as novel cancer therapies.

Area of Science:

  • Pharmacology
  • Oncology
  • Molecular Biology

Background:

  • Cardiotonic steroids (CSs) are natural compounds inhibiting Na(+)/K(+)-ATPase.
  • Epidemiological studies suggest CSs may reduce cancer mortality.
  • CSs exhibit additional anticancer mechanisms beyond Na(+)/K(+)-ATPase inhibition.

Purpose of the Study:

  • Investigate the anticancer effects of CSs (ouabain, cinobufagin) in hepatoma cell lines.
  • Elucidate the molecular mechanisms underlying CS anticancer activity.

Main Methods:

  • Utilized HepG2 and SMMC-7721 hepatoma cell lines.
  • Assessed cell proliferation, apoptosis, and cell cycle progression.
  • Analyzed key protein and gene expression (ERK, C-myc, Cyclin A, CDK2, PCNA, p21(CIP1)).
  • Investigated the role of extracellular regulated kinase (ERK) signaling.

Main Results:

  • Ouabain and cinobufagin significantly inhibited cell proliferation and induced apoptosis.
  • CSs attenuated ERK phosphorylation and decreased C-myc expression.
  • CSs induced S phase cell cycle arrest by modulating cell cycle regulators.
  • Overexpression of ERK reversed the antiproliferative effects of CSs.

Conclusions:

  • CSs demonstrate significant anticancer effects in hepatoma cells via multiple molecular pathways.
  • CSs represent a promising therapeutic strategy for cancer treatment.
  • Ongoing clinical trials (Phase I) for CS-based drugs (UNBS1450, Anvirzel) warrant further investigation.

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