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Transgenic mouse line overexpressing the cancer-specific tNOX protein has an enhanced growth and acquired

Kader Yagiz1, D James Morré, Dorothy M Morré

  • 1Department of Foods and Nutrition, Purdue University, West Lafayette, IN 47907-2059, USA.

The Journal of Nutritional Biochemistry
|March 7, 2006
PubMed

Insights

The study identifies tNOX as a key target for cancer therapy. Overexpressing tNOX in mice accelerated growth, but (-)-epigallocatechin-3-gallate (EGCg) treatment normalized it, validating tNOX

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Pharmacology

Background:

  • tNOX is a cell surface protein linked to cancer cell growth and drug resistance.
  • Quinone site inhibitors, including (-)-epigallocatechin-3-gallate (EGCg), are being investigated for anticancer effects.
  • The precise molecular target of these inhibitors, particularly EGCg, remains under investigation.

Purpose of the Study:

  • To investigate the role of tNOX as a molecular target for the anticancer activity of EGCg.
  • To determine the in vivo growth phenotype of cells overexpressing tNOX.
  • To assess the susceptibility of tNOX-overexpressing models to EGCg treatment.

Main Methods:

  • Generation of a transgenic mouse line overexpressing the tNOX protein using a phCMV2 vector with an HA tag.
  • Transfection of noncancer cells to overexpress tNOX and assess growth and EGCg response.
  • Administration of EGCg (500 mg/kg BW) in drinking water to transgenic and wild-type mice.
  • Measurement of growth rates and carcass weight in experimental groups.

Main Results:

  • Cultured noncancer cells lacking tNOX were unresponsive to EGCg.
  • Overexpression of tNOX in noncancer cells led to enhanced growth and acquired sensitivity to EGCg.
  • Transgenic mice overexpressing tNOX exhibited accelerated growth rates, with females growing twice as fast as wild-type.
  • EGCg administration significantly reduced the growth rate of transgenic mice to levels comparable to wild-type mice.

Conclusions:

  • tNOX is a necessary and sufficient molecular target for the anticancer effects of EGCg.
  • These findings validate the hypothesis that tNOX mediates the protective and potential therapeutic benefits of EGCg.
  • The study provides in situ evidence for tNOX as a target for cancer therapeutics.

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