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Suppression of T-cell lymphomagenesis in mice requires PTEN phosphatase activity

Ryan H Newton1, Yu Lu2, Antonella Papa3

  • 1Department of Surgery and Center for Transplantation Sciences, Massachusetts General Hospital.

Blood
|December 6, 2014
PubMed

Insights

The tumor suppressor PTEN is crucial for preventing T-cell lymphoma. Its phosphatase activity is essential for blocking the development of malignant T-cells and preventing lymphomagenesis.

Area of Science:

  • Immunology
  • Oncology
  • Molecular Biology

Background:

  • The tumor suppressor gene PTEN has dual roles: opposing PI3K signaling via lipid phosphatase activity and promoting genomic stability.
  • Loss of PTEN in T-cells leads to thymic lymphomas with a specific translocation, t(14;15), involving the T-cell receptor locus and c-myc.
  • It was unclear whether PTEN's lipid phosphatase activity or its role in genomic stability was critical for preventing lymphoma.

Purpose of the Study:

  • To determine whether PTEN's phosphatase activity is required for preventing T-cell lymphoma development.
  • To investigate the specific function of PTEN in suppressing lymphomagenesis.

Main Methods:

  • Utilized a conditional mouse model where T-cells selectively express a phosphatase-dead PTEN mutant (C124S) while maintaining a null allele.
  • Analyzed the development of thymic lymphomas and the presence of the t(14;15) translocation in these mice.

Main Results:

  • Mice expressing the phosphatase-dead PTEN mutant developed thymic lymphomas harboring the t(14;15) translocation.
  • PTEN's phosphatase activity was demonstrated to be necessary for preventing the emergence of this malignant T-cell population.

Conclusions:

  • PTEN's lipid phosphatase activity is essential for preventing T-cell lymphomagenesis.
  • This activity is critical for blocking the development of T-cell lymphomas with the t(14;15) translocation.

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