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Impairment of the p27kip1 function enhances thyroid carcinogenesis in TRK-T1 transgenic mice

Monica Fedele1, Dario Palmieri, Gennaro Chiappetta

  • 1Istituto di Endocrinologia ed Oncologia Sperimentale del CNR, 80131 Naples, Italy.

Endocrine-Related Cancer
|March 6, 2009
PubMed

Insights

Loss of p27(kip1) function accelerates papillary thyroid cancer development in mice. Reduced p27(kip1) levels correlate with increased cancer incidence and proliferation, suggesting a dose-dependent role in thyroid carcinogenesis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • p27(kip1) is a cell cycle inhibitor frequently impaired in thyroid carcinomas.
  • Reduced expression or mislocalization of p27(kip1) is linked to thyroid cancer progression.

Purpose of the Study:

  • To investigate the role of p27(kip1) impairment in papillary thyroid cancer (PTC) development.
  • To assess the consequences of p27(kip1) loss-of-function in a mouse model of PTC.

Main Methods:

  • Utilized a mouse model expressing the TRK-T1 oncogene under thyroglobulin promoter control.
  • Generated mice with different p27(kip1) genotypes: null (p27(-/-)), heterozygous (p27(+/-)), and wild-type (p27(+/+)).
  • Compared PTC incidence, latency, and proliferation index across genotypes.

Main Results:

  • Mice lacking p27(kip1) (TRK-T1/p27(-/-)) showed a higher incidence and shorter latency of PTC.
  • These mice also exhibited an increased proliferation index compared to wild-type controls (TRK-T1/p27(+/+)).
  • Heterozygous mice (TRK-T1/p27(+/-)) displayed an intermediate incidence of PTC.

Conclusions:

  • p27(kip1) loss-of-function significantly promotes papillary thyroid cancer development.
  • The study demonstrates a dose-dependent role for p27(kip1) in thyroid carcinogenesis.
  • These findings highlight p27(kip1) as a critical tumor suppressor in thyroid cancer.

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