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N-ethyl-N-hydroxyethylnitrosamine (EHEN)-induced renal and hepatocarcinogenesis in the tumor suppressor Tsc2

Nobuo Satake1, Makoto Miyagawa, Junko Sakurai

  • 1Department of Experimental Pathology, Cancer Institute, Japanese Foundation for Cancer Research, 1-37-1 Kami-Ikebukuro, Toshima-ku, Tokyo 170-8455, Japan.

Cancer Letters
|July 20, 2002
PubMed

Insights

Extra Tsc2 gene copies did not prevent chemically induced renal carcinomas (RCs) in rats. This suggests other genes are involved in rat RC development, highlighting the complexity of chemical carcinogenesis.

Area of Science:

  • Oncology
  • Genetics
  • Toxicology

Background:

  • Hereditary renal carcinomas (RCs) in Eker rats are linked to Tsc2 gene mutations.
  • Tsc2 alterations are implicated in chemically induced rat RCs.

Purpose of the Study:

  • To investigate the effect of Tsc2 gene duplication on chemically induced renal and liver cancer in rats.
  • To explore the role of Tsc2 in chemical carcinogenesis.

Main Methods:

  • In vivo study using transgenic rats with extra Tsc2 gene copies.
  • Chemical induction of carcinogenesis using N-ethyl-N-hydroxyethylnitrosamine (EHEN).
  • Monitoring and comparison of renal carcinoma and hepatic foci incidence between transgenic and non-transgenic rats.

Main Results:

  • A slightly higher incidence of RCs was observed in non-transgenic rats (2/17) compared to transgenic rats (0/32), but this difference was not statistically significant.
  • No significant difference was found in the development of hepatic glutathione S-transferase placental type positive foci between the groups.
  • The findings suggest that Tsc2 gene dosage alone is not sufficient to prevent EHEN-induced RCs.

Conclusions:

  • The Tsc2 gene may not be the sole determinant in chemically induced rat renal carcinogenesis.
  • Other genes likely play a significant role in the development of EHEN-induced renal tumors.
  • Further research is needed to identify additional target genes involved in rat RC development.

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