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An Orthotopic Murine Model of Human Prostate Cancer Metastasis
06:48

An Orthotopic Murine Model of Human Prostate Cancer Metastasis

Published on: September 18, 2013

PTEN deficiency is fully penetrant for prostate adenocarcinoma in C57BL/6 mice via mTOR-dependent growth

Jorge Blando1, Melisa Portis, Fernando Benavides

  • 1Department of Carcinogenesis, Research Division, Smithville, Texas 78957, USA.

The American Journal of Pathology
|April 28, 2009
PubMed

Insights

Mice with one altered copy of the phosphatase and tensin homolog (PTEN) gene developed prostate adenocarcinoma. This finding establishes a new preclinical model for studying PTEN-driven prostate cancer and its treatment.

Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • The tumor suppressor gene PTEN is frequently altered in human prostate cancer.
  • Developing accurate preclinical models is crucial for understanding prostate cancer and testing therapies.
  • Previous mouse models involving Pten alterations showed limited or incomplete prostate cancer development.

Purpose of the Study:

  • To establish a fully penetrant mouse model for prostate adenocarcinoma using Pten heterozygosity.
  • To investigate the role of PI3K signaling in Pten-deficient prostate tumors.
  • To evaluate the therapeutic potential of targeting mTOR in this model.

Main Methods:

  • Generating Pten heterozygous mice on a C57BL/6 background.
  • Analyzing tumor development, progression, and molecular signaling pathways (PTEN, PI3K, mTOR).
  • Treating mice with rapamycin to assess mTOR dependency.

Main Results:

  • Pten heterozygosity on a C57BL/6 background led to 100% penetrant prostate adenocarcinoma by 10-12 months.
  • Loss of PTEN expression and PI3K signaling activation were observed in tumors.
  • Rapamycin treatment reduced tumor growth, phospho-S6 levels, and proliferation in Pten(+/-) mice.

Conclusions:

  • Pten heterozygosity alone is sufficient to drive prostate adenocarcinoma development in mice.
  • PI3K signaling activation is an early event in Pten-deficient prostate tumorigenesis.
  • mTOR is a critical mediator of tumor growth in this model, suggesting therapeutic relevance.

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