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mTORC1 activation blocks BrafV600E-induced growth arrest but is insufficient for melanoma formation.

Cancer cell | 2015

Braf(V600E) induces benign, growth-arrested melanocytic nevus development, but also drives melanoma formation. Cdkn2a loss in Braf(V600E) melanocytes in mice results in rare progression to melanoma, but only after stable growth arrest as nevi. Immediate progression to melanoma is prevented by upregulation of miR-99/100, which downregulates mTOR and IGF1R signaling. mTORC1 activation through Stk11 (Lkb1) loss abrogates growth arrest of Braf(V600E) melanocytic nevi, but is insufficient for complete progression to melanoma. Cdkn2a loss is associated with mTORC2 and Akt activation in human and murine melanocytic neoplasms. Simultaneous Cdkn2a and Lkb1 inactivation in Braf(V600E) melanocytes results in activation of both mTORC1 and mTORC2/Akt, inducing rapid melanoma formation in mice. In this model, activation of both mTORC1/2 is required for Braf-induced melanomagenesis.

Pubmed ID: 25584893 RIS Download

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Associated grants

  • Agency: NCI NIH HHS, United States
    Id: R01 CA176839
  • Agency: NIGMS NIH HHS, United States
    Id: T32 GM007205
  • Agency: NCI NIH HHS, United States
    Id: P50 CA121974
  • Agency: NCI NIH HHS, United States
    Id: K22 CA163799
  • Agency: NCI NIH HHS, United States
    Id: R01 CA112054
  • Agency: NCI NIH HHS, United States
    Id: CA-16672
  • Agency: NIGMS NIH HHS, United States
    Id: P20 GM103449
  • Agency: NCI NIH HHS, United States
    Id: P30 CA016672
  • Agency: NCI NIH HHS, United States
    Id: P01 CA128814

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Gene Expression Omnibus (GEO) (tool)

RRID:SCR_005012

Functional genomics data repository supporting MIAME-compliant data submissions. Includes microarray-based experiments measuring the abundance of mRNA, genomic DNA, and protein molecules, as well as non-array-based technologies such as serial analysis of gene expression (SAGE) and mass spectrometry proteomic technology. Array- and sequence-based data are accepted. Collection of curated gene expression DataSets, as well as original Series and Platform records. The database can be searched using keywords, organism, DataSet type and authors. DataSet records contain additional resources including cluster tools and differential expression queries.

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