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Updated: Jun 10, 2026

Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
06:09

Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells

Published on: June 7, 2019

Cooperative interactions of PTEN deficiency and RAS activation in melanoma metastasis

C Nogueira1, K-H Kim, H Sung

  • 1Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA.

Oncogene
|August 17, 2010
PubMed

Insights

Loss of PTEN cooperates with HRAS activation to drive melanoma development and metastasis in mice. Pten inactivation promotes melanoma cell invasion and migration, highlighting its role in RAS-driven melanoma progression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Mitogen-activated protein kinase (MAPK) and AKT pathways are commonly co-activated in melanoma.
  • This co-activation occurs via receptor tyrosine kinases, RAS/BRAF mutations, or loss of PTEN.
  • RAS activation and PTEN loss are considered potentially redundant events in melanoma pathogenesis.

Purpose of the Study:

  • To investigate the genetic interactions between HRAS activation and PTEN inactivation in melanoma genesis and progression.
  • To understand the in vivo role of these interactions using genetically engineered mouse models.

Main Methods:

  • Utilized genetically engineered mouse models of cutaneous melanoma.
  • Performed gain- and loss-of-function studies on melanoma cells and melanocytes.
  • Analyzed melanoma penetrance, metastasis, invasion, and migration.

Main Results:

  • HRAS activation cooperated with Pten+/- and Ink4a/Arf-/- to increase melanoma penetrance and metastasis.
  • PTEN loss enhanced melanoma cell and melanocyte invasion and migration.
  • PTEN inactivation correlated with AKT2 phosphorylation and E-cadherin downregulation.

Conclusions:

  • PTEN inactivation can drive melanoma genesis and metastatic progression in RAS-activated, Ink4a/Arf-deficient melanomas.
  • The findings clarify the genetic cooperation between RAS and PTEN in melanoma.
  • PTEN loss plays a significant role in promoting melanoma cell motility and invasion.

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