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PTEN is a tumor suppressor in CML stem cells and BCR-ABL-induced leukemias in mice

Cong Peng1, Yaoyu Chen, Zhongfa Yang

  • 1Division of Hematology/Oncology, Department of Medicine, University of Massachusetts Medical School, Worcester, MA, USA.

Blood
|December 8, 2009
PubMed

Insights

The tumor suppressor PTEN (phosphatase and tensin homolog) is crucial in preventing BCR-ABL-induced leukemias. Its deletion accelerates CML, while its overexpression delays leukemia development and prolongs survival.

Area of Science:

  • Oncology
  • Molecular Biology
  • Hematology

Background:

  • The tumor suppressor gene PTEN (phosphatase and tensin homolog) is frequently inactivated in human cancers.
  • The role of PTEN in Philadelphia chromosome-positive leukemias, including CML and B-ALL, induced by the BCR-ABL oncogene, remains largely unknown.

Purpose of the Study:

  • To investigate the function of PTEN as a tumor suppressor in BCR-ABL-induced leukemias.
  • To elucidate the mechanisms by which PTEN regulates leukemia stem cells and impacts disease progression.

Main Methods:

  • Utilized a mouse model of BCR-ABL-induced leukemias.
  • Analyzed PTEN expression levels in leukemia stem cells.
  • Assessed the impact of PTEN deletion and overexpression on leukemia development and survival.
  • Investigated the downstream targets of PTEN, including Akt1.

Main Results:

  • BCR-ABL down-regulates PTEN in leukemia stem cells of CML.
  • PTEN deletion accelerates CML development.
  • Overexpression of PTEN delays CML and B-ALL progression and extends survival in leukemia mouse models.
  • PTEN suppresses leukemia stem cells and induces cell-cycle arrest.
  • PTEN inhibits B-ALL development by regulating its downstream effector Akt1.

Conclusions:

  • PTEN plays a critical role in suppressing BCR-ABL-induced leukemias.
  • PTEN acts as a tumor suppressor in Philadelphia chromosome-positive leukemias.
  • Targeting PTEN represents a potential therapeutic strategy for Philadelphia chromosome-positive leukemia.

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