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Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods
07:49

Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods

Published on: July 17, 2019

6.6K

RAF proteins exert both specific and compensatory functions during tumour progression of NRAS-driven melanoma

Coralie Dorard1,2,3,4,5, Charlène Estrada1,2,3,4,5, Céline Barbotin1,2,3,4,5

  • 1Institut Curie, Orsay F-91405, France.

Nature Communications
|May 13, 2017
PubMed

Insights

In NRAS-driven melanoma, BRAF is crucial for early tumor development. RAF kinases have redundant roles in tumor maintenance, with ARAF ultimately driving resistant cell proliferation.

Area of Science:

  • Oncology
  • Molecular Biology
  • Dermatology

Background:

  • NRAS and BRAF mutations are common in melanoma.
  • CRAF's critical role in RAS-driven cancers contrasts with BRAF's role, posing questions about RAF protein function in NRAS-induced melanoma.

Purpose of the Study:

  • Investigate the contribution of RAF proteins (BRAF, CRAF, ARAF) in NRAS-induced melanoma progression.
  • Determine the specific and compensatory roles of RAF kinases from tumor onset to malignant maintenance.

Main Methods:

  • Utilized conditional gene ablation of Raf genes in NRAS-induced mouse melanoma models.
  • Analyzed ERK activation, nevi development, tumor progression, and proliferation of resistant cells.

Main Results:

  • BRAF expression is essential for ERK activation and early nevi development in NRAS-driven melanoma.
  • Single ablation of BRAF or CRAF did not halt tumor growth, indicating redundant RAF kinase functions.
  • ARAF-mediated ERK activation sustained proliferation in BRAF- and CRAF-deficient resistant cells.

Conclusions:

  • BRAF and CRAF exhibit distinct and compensatory functions in NRAS-driven melanoma.
  • NRAS-driven melanoma is addicted to RAF signaling throughout its progression.

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