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Related Experiment Videos

Transgenic mouse models in carcinogenesis research and testing.

S S Thorgeirsson1, V M Factor, E G Snyderwine

  • 1Laboratory of Experimental Carcinogenesis, Division of Basic Sciences, National Cancer Institute, National Institutes of Health, Room 3C28, Building 37, 37 Convent Drive MSC4255, Bethesda, MD, USA. snorri_thorigeirsson@nih.gov

Toxicology Letters
|March 18, 2000
PubMed
Summary

Transgenic mice co-expressing TGF-alpha and c-myc show increased oxidative stress, DNA damage, and accelerated liver cancer. This model helps study environmental chemical interactions with oncogenes in tumorigenesis.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Transgenic mouse models are crucial for studying complex diseases like cancer.
  • Understanding oncogene and growth factor interactions is key to cancer research.

Purpose of the Study:

  • To investigate the interaction of c-myc and TGF-alpha transgenes in liver cancer development.
  • To establish a model for studying environmental chemical impacts on oncogenesis.
  • To explore the role of oxidative stress and DNA damage in hepatocarcinogenesis.

Main Methods:

  • Generation of double transgenic mice with specific oncogene and growth factor fusion genes.
  • Utilizing lacZ reporter gene systems to assess mutagenicity.
  • Analyzing oxidative stress markers and DNA damage in liver tissues.

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Main Results:

  • Co-expression of TGF-alpha and c-myc led to reactive oxygen species (ROS) overproduction and oxidative stress.
  • This oxidative stress correlated with significant DNA damage and accelerated hepatocarcinogenesis.
  • The environmental chemical MeIQx demonstrated increased mutagenicity in transgenic models, linking chemical exposure to genetic alterations.

Conclusions:

  • The TGF-alpha/c-myc mouse model effectively demonstrates the link between oxidative stress, DNA damage, and liver cancer acceleration.
  • Transgenic models are valuable tools for evaluating carcinogenic potential of environmental chemicals and their gene interactions.