Co-targeting of Akt and Myc inhibits viability of lymphoma cells from Lck-Dlx5 mice

Cancer Biology & Therapy
Yinfei TanJoseph R Testa

Abstract

Constitutive activation of AKT is a frequent occurrence in the development of human T-cell acute lymphocytic leukemia/lymphomas (T-ALLs), due largely to inactivation of PTEN. Up regulation of MYC is also commonly observed in human T-ALLs. We previously demonstrated that expression of a constitutively active form of Lck-Akt2 alone is sufficient to initiate T-cell lymphoma in mice, and that tumor formation typically requires up regulation of Myc or Dlx5 caused by specific chromosomal rearrangements. Furthermore, Lck-Dlx5 mice develop T-ALLs that consistently acquire overexpression of Myc and activation of Akt, the latter due to loss of Pten expression. Proliferation of T-ALL cells from Lck-Dlx5 mice was found to be highly sensitive to the Akt pathway inhibitors BEZ235 and RAD001, as well as to JQ1, an inhibitor of bromodomain proteins, one of which (BRD4) regulates Myc transcription. Additionally, low concentrations of BEZ235 were found to cooperate with JQ1 to enhance cell cycle arrest. Higher concentrations of BEZ235 (≥0.5 µM) promoted cell death, although the addition of JQ1 did not result in a further increase in apoptosis. In contrast, the specific Myc inhibitor 10058-F4 caused apoptosis, and when combined with BEZ235 (≥0.5 ...Continue Reading

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Citations

May 28, 2015·Current Hematologic Malignancy Reports·Carla Casulo, Jonathan Friedberg
Jul 7, 2015·Trends in Biochemical Sciences·Chen-Yi Wang, Panagis Filippakopoulos
Apr 1, 2017·Genes·Himalee S SabnisKevin D Bunting
Feb 9, 2020·International Journal of Molecular Sciences·Chiara TarantelliFrancesco Bertoni
Jul 3, 2021·Cancers·Yinfei Tan, Joseph R Testa

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Methods Mentioned

BETA
transgenic
FACS
flow cytometry
chips

Software Mentioned

FlowJo

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