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

Am J Pathol. 2009 May;174(5):1869-79. doi: 10.2353/ajpath.2009.080055.

Abstract

The tumor suppressor phosphatase and tensin homolog (PTEN) is frequently involved in human prostate carcinoma. PTEN is therefore an attractive target for the development of preclinical animal models. Prostate intraepithelial neoplasia lesions develop in mice with Pten heterozygosity, but disease progression has been reported only in combination with either other tumor suppressor gene alterations or the conditional inactivation of both Pten alleles in prostate epithelial cells. We report that on a C57BL/6 background, in contrast to previous studies on mixed 129 genetic backgrounds, Pten locus heterozygosity is fully penetrant for the development of prostate adenocarcinoma. Grossly observable tumors were detected at 6 months of age, and, by 10 to 12 months, 100% of examined mice developed adenocarcinoma of the anterior prostate. Furthermore, double heterozygotes carrying both Pten and Tsc2-null alleles showed no increase relative to Pten(+/-) heterozygotes in either lesion development or progression. Lesions in both Pten(+/-); Tsc2(+/-), and Pten(+/-) mice exhibited loss of PTEN expression and activation of PI3K signaling. PI3K activation occurred early in prostate intraepithelial neoplasia lesion formation in these animals, consistent with loss of PTEN function, and contributed to the etiology of tumors that developed in Pten(+/-) mice. Furthermore, prostate lesion growth in Pten(+/-) mice was dependent on mTOR, as evidenced by a reduction in both phospho-S6 levels and proliferative index after rapamycin treatment.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Adenocarcinoma / metabolism
  • Adenocarcinoma / pathology*
  • Animals
  • Blotting, Western
  • Disease Progression
  • Fluorescent Antibody Technique
  • Gene Expression Regulation, Neoplastic
  • Humans
  • Incidence
  • Loss of Heterozygosity
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Microsatellite Repeats
  • PTEN Phosphohydrolase / physiology*
  • Phosphatidylinositol 3-Kinases / genetics
  • Phosphatidylinositol 3-Kinases / metabolism
  • Prostatic Intraepithelial Neoplasia / metabolism
  • Prostatic Intraepithelial Neoplasia / pathology
  • Prostatic Neoplasms / metabolism
  • Prostatic Neoplasms / pathology*
  • Protein Kinases / genetics
  • Protein Kinases / metabolism*
  • Proto-Oncogene Proteins c-akt / genetics
  • Proto-Oncogene Proteins c-akt / metabolism
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism
  • Reverse Transcriptase Polymerase Chain Reaction
  • Signal Transduction
  • Sirolimus / pharmacology
  • TOR Serine-Threonine Kinases
  • Tuberous Sclerosis Complex 2 Protein
  • Tumor Suppressor Proteins / physiology*

Substances

  • RNA, Messenger
  • TSC2 protein, human
  • Tsc2 protein, mouse
  • Tuberous Sclerosis Complex 2 Protein
  • Tumor Suppressor Proteins
  • Protein Kinases
  • Phosphatidylinositol 3-Kinases
  • MTOR protein, human
  • TOR Serine-Threonine Kinases
  • mTOR protein, mouse
  • Proto-Oncogene Proteins c-akt
  • PTEN Phosphohydrolase
  • Pten protein, mouse
  • Sirolimus