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Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
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Abl kinase regulation by BRAF/ERK and cooperation with Akt in melanoma

A Jain1, R Tripathi1, C P Turpin1

  • 1Department of Pharmacology and Nutritional Sciences, University of Kentucky School of Medicine, Lexington, KY, USA.

Oncogene
|April 4, 2017
PubMed

Insights

BRAFV600E/ERK signaling activates Abl/Arg kinases in melanoma, driving tumor progression. Targeting Abl/Arg with Akt inhibitors offers new therapeutic strategies for BRAFV600E/PTEN mutant melanomas resistant to current treatments.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Melanoma incidence is rising, with metastatic and therapy-resistant cases remaining a significant clinical challenge.
  • Mutations in BRAFV600E and PTEN are common in resistant melanomas, often limiting the efficacy of BRAF inhibitors (BRAFi) and immune checkpoint inhibitors.
  • Abl kinases (Abl/Arg) are implicated in melanoma progression, but their activation mechanism remains unclear.

Purpose of the Study:

  • To elucidate the mechanism linking BRAFV600E/ERK signaling to Abl kinase activation in melanoma.
  • To investigate the functional and biological significance of Abl/Arg activation in melanoma.
  • To explore therapeutic strategies targeting Abl/Arg in combination with other pathways for BRAFV600E/PTEN mutant melanomas.

Main Methods:

  • Investigated the interaction and phosphorylation of Abl kinases by BRAFV600E/ERK signaling and Src family kinases.
  • Assessed the role of Abl/Arg activation in melanoma cell proliferation, invasion, and epithelial-mesenchymal-transition (EMT) transcription factor expression.
  • Evaluated the efficacy of combined Abl/Arg and Akt inhibition in preclinical melanoma models.

Main Results:

  • Demonstrated that BRAFV600E/ERK signaling directly regulates Abl/Arg localization and activation.
  • Confirmed that activated Abl/Arg drives melanoma proliferation, invasion, and EMT.
  • Showed that Abl/Arg and Akt inhibitors synergistically inhibit viability, cell cycle progression, and in vivo growth of BRAFV600E/PTEN mutant melanomas.

Conclusions:

  • Established a novel mechanistic link between BRAFV600E/ERK signaling and Abl/Arg activation in melanoma.
  • Highlighted the critical role of Abl/Arg in melanoma progression and therapeutic resistance.
  • Provided a strong rationale for targeting Abl/Arg in combination with Akt inhibitors for treating refractory BRAFV600E/PTEN mutant melanomas.

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