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Pten and p27KIP1 cooperate in prostate cancer tumor suppression in the mouse

A Di Cristofano1, M De Acetis, A Koff

  • 1Department of Human Genetics, Memorial Sloan-Kettering Cancer Center, Sloan-Kettering Institute, New York, New York, USA.

Nature Genetics
|February 15, 2001
PubMed

Insights

The tumor suppressor genes PTEN and p27(KIP1) are crucial for preventing prostate cancer. Inactivating both genes accelerates tumor development, highlighting their combined role in cell-cycle control.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Prostate cancer development is linked to PTEN tumor suppressor gene inactivation and reduced p27(KIP1) expression.
  • While PTEN inactivation is common in advanced prostate cancers, mice lacking p27(KIP1) do not develop the disease.
  • PTEN influences p27(KIP1) expression, which regulates cell cycle transition, suggesting p27(KIP1) inactivation might be downstream of PTEN.

Purpose of the Study:

  • To investigate the combined role of PTEN and p27(KIP1) in prostate tumorigenesis.
  • To determine if simultaneous genetic alterations in Pten and Cdkn1b accelerate cancer development.
  • To elucidate the impact of combined Pten and Cdkn1b inactivation on cell proliferation and survival.

Main Methods:

  • Utilized genetically modified mouse models with combined Pten and Cdkn1b allele inactivation (Pten(+/-)/Cdkn1b(-/-)).
  • Monitored tumor incidence, latency, and histological characteristics.
  • Assessed cell proliferation and survival rates in the experimental mouse cohorts.

Main Results:

  • Concomitant inactivation of one Pten allele and one or both Cdkn1b alleles significantly accelerated spontaneous tumor formation across various tissues.
  • Pten(+/-)/Cdkn1b(-/-) mice exhibited increased cell proliferation but not cell survival.
  • These mice developed prostate carcinoma with complete penetrance within three months, mirroring human prostate cancer pathology.

Conclusions:

  • The combined tumor-suppressive functions of Pten and p27(Kip1) are critical for controlling cell-cycle progression and preventing prostate cancer.
  • Simultaneous loss of Pten and p27(Kip1) function cooperatively drives neoplastic transformation and prostate carcinoma development.
  • This study underscores the importance of the PTEN/p27(KIP1) pathway in prostate tumorigenesis and provides a relevant preclinical model.

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