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Stress-induced down-regulation of tumor-associated NADH oxidase during apoptosis in transformed cells

Liang-Chi Mao1, Hsi-Ming Wang, You-Yu Lin

  • 1Institute of Biomedical Sciences, National Chung Hsing University, Taichung 40227, Taiwan, ROC.

FEBS Letters
|September 16, 2008
PubMed

Insights

Tumor-associated NADH oxidase (tNOX) is crucial for cancer cell growth. Its suppression during apoptosis sensitizes cells to stress, highlighting tNOX

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Tumor-associated NADH oxidase (tNOX) is a growth-related protein found in transformed cells.
  • tNOX plays a role in regulating cell proliferation and migration, contributing to the cancer phenotype.

Purpose of the Study:

  • To investigate the role of tNOX during apoptosis and its impact on transformed cell growth.
  • To determine if tNOX expression is altered during stress-induced apoptosis.

Main Methods:

  • Utilized RNA interference (RNAi) and short hairpin RNA (shRNA) to knockdown tNOX expression in HCT116 and HeLa cells.
  • Induced apoptosis using various stress treatments and monitored tNOX expression levels.
  • Assessed cell proliferation and apoptosis susceptibility following tNOX manipulation.

Main Results:

  • tNOX knockdown significantly reduced HeLa cell proliferation and migration.
  • tNOX expression was down-regulated concurrently with apoptosis in HCT116 cells following diverse stress treatments.
  • shRNA-mediated tNOX knockdown sensitized cells to apoptosis, while tNOX re-expression partially restored proliferation.

Conclusions:

  • tNOX is suppressed during apoptosis.
  • Down-regulation of tNOX sensitizes transformed cells to stress-induced growth reduction.
  • tNOX is essential for the sustained growth of cancer cells.

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