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Related Experiment Video

Updated: Jun 19, 2026

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

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

Published on: June 7, 2019

c-Kit mutants require hypoxia-inducible factor 1alpha to transform melanocytes.

G Monsel¹, N Ortonne, M Bagot

¹INSERM U976, Hôpital Saint Louis, Paris, France.

|October 6, 2009

Summary

Activating c-Kit mutants in melanoma require specific epigenetic conditions, like hypoxia, to transform melanocytes. This transformation, driven by phosphatidyl-inositol-3 kinase and Ras/Raf/Mek/Erk pathways, is inhibited by imatinib.

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Last Updated: Jun 19, 2026

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

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Published on: June 7, 2019

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Published on: September 7, 2013

Area of Science:

Oncology
Molecular Biology
Dermatology

Background:

The role of c-Kit in melanoma development is unclear, despite its importance in normal melanocyte development.
While c-Kit is often lost during melanoma progression, some melanomas overexpress it, and activating mutations are found in acral and mucosal subtypes.

Purpose of the Study:

To investigate the role of frequent c-Kit mutants (K642E, L576P) and a novel mutant in melanocyte transformation.
To analyze downstream signaling pathways activated by these c-Kit mutants.

Main Methods:

Characterization of physiological responses in melanocytes expressing specific c-Kit mutants.
Analysis of phosphatidyl-inositol-3 kinase (PI3K) and Ras/Raf/Mek/Erk pathway activation.
Assessment of melanocyte transformation under normoxic and hypoxic conditions, with or without hypoxia-inducible factor 1-alpha (HIF-1alpha) coexpression.
Evaluation of imatinib's effect on transformed melanocyte proliferation.

Main Results:

All three c-Kit mutants strongly activated the PI3K pathway but only weakly activated the Ras/Raf/Mek/Erk pathway, insufficient for uncontrolled proliferation.
Hypoxic conditions or coexpression with active HIF-1alpha enabled c-Kit mutants to activate the Ras/Raf/Mek/Erk pathway, leading to melanocyte proliferation and transformation.
Imatinib specifically inhibited the proliferation of melanocytes transformed by these c-Kit mutants.

Conclusions:

Melanocyte transformation by c-Kit mutants necessitates a specific epigenetic environment, such as hypoxia.
This study reveals a distinct molecular mechanism underlying melanocyte transformation mediated by c-Kit mutants.
Targeting c-Kit with imatinib shows potential therapeutic relevance for specific melanoma subtypes.