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Updated: Aug 13, 2025
06:09
Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
Published on: June 7, 2019
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Notch Signaling Suppresses Melanoma Tumor Development in BRAF/Pten Mice
Dareen Mikheil1, Kirthana Prabhakar1, Tun Lee Ng2
1Department of Dermatology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI 53705, USA.
Cancers
|January 21, 2023
Summary
Notch signaling has dual roles in melanoma development. Loss of Notch1 or Notch2 accelerates tumor growth in a Pten-null background, suggesting a tumor suppressor role in melanoma progression.
Area of Science:
- Oncology
- Molecular Biology
- Dermatology
Background:
- Notch signaling exhibits contradictory roles in melanoma, acting as both oncogenic and tumor-suppressive.
- Clinical trials show Notch inhibitors are ineffective for melanoma treatment.
- Notch signaling influences melanoma transdifferentiation, a key prognostic factor.
Purpose of the Study:
- To investigate the role of Notch signaling in melanoma tumor development and growth.
- To elucidate the specific functions of Notch1 and Notch2 in BRAFV600E-driven melanomagenesis.
- To explore the correlation between Notch protein levels and clinical parameters in human melanoma.
Main Methods:
- Utilized a genetic mouse model of melanoma by crossing specific BRAF and Pten mutant mice with Notch1 or Notch2 floxed alleles.
- Induced tumors via tamoxifen application in genetically modified mice.
- Performed quantitative immunochemical analysis on a human cutaneous melanoma tissue microarray (>100 primary tumors).
Main Results:
- Loss of Notch1 or Notch2 did not substitute for Pten's tumor suppressor function in BRAFV600E-induced melanomagenesis.
- In a Pten-null background, loss of Notch1 or Notch2 accelerated BRAFV600E-induced tumor development.
- A weak to moderate correlation was observed between NOTCH protein levels and clinical/pathological parameters in human melanoma.
Conclusions:
- Notch1 and Notch2 act as tumor suppressors in the context of BRAFV600E/Pten-null driven melanomagenesis.
- Notch signaling is implicated in melanoma development.
- Identifying downstream targets of Notch signaling may offer new avenues for melanoma prevention strategies.
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