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Updated: Jul 19, 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

Oncogenic BRAF regulates beta-Trcp expression and NF-kappaB activity in human melanoma cells

J Liu1, K G Suresh Kumar, D Yu

  • 1Department of Animal Biology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104-6046, USA.

Oncogene
|September 27, 2006
PubMed

Insights

Mutant BRAF promotes melanoma cell survival by activating the NF-kappaB pathway. Inhibiting BRAF signaling reduces NF-kappaB activity, leading to melanoma cell death.

Area of Science:

  • Molecular Oncology
  • Cell Signaling

Background:

  • BRAF mutations are common in melanoma, driving cell growth and survival.
  • Melanoma cells display constitutive activation of the anti-apoptotic transcription factor NF-kappaB.
  • NF-kappaB activation is regulated by IkappaB degradation, mediated by IKK and beta-Trcp.

Purpose of the Study:

  • To investigate the role of BRAF signaling in regulating NF-kappaB activity in melanoma.
  • To elucidate the mechanism by which BRAF influences IkappaB degradation and NF-kappaB activation.

Main Methods:

  • Expression analysis of beta-Trcp in melanocytes with oncogenic BRAF.
  • Assay of IKK activity and IkappaBalpha degradation rates.
  • Inhibition of BRAF signaling using a Raf inhibitor (BAY 43-9006) and RNA interference.
  • Assessment of NF-kappaB transcriptional activity and apoptosis induction.

Main Results:

  • Oncogenic BRAF (V600E) expression enhanced beta-Trcp expression, IKK activity, and IkappaBalpha degradation.
  • BRAF inhibition decreased IKK activity, beta-Trcp expression, and IkappaBalpha degradation.
  • BRAF inhibition led to NF-kappaB pathway suppression and increased melanoma cell apoptosis.

Conclusions:

  • Mutational activation of BRAF contributes to constitutive NF-kappaB induction in melanoma.
  • BRAF signaling promotes melanoma cell survival through sustained NF-kappaB activation.
  • Targeting BRAF may represent a therapeutic strategy to sensitize melanoma cells to apoptosis.

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