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Updated: Dec 27, 2025

Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
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Deregulation of cell growth and apoptosis in UV-induced melanomagenesis

Allal Ouhtit1, Ishita Gupta2, Rajiv L Gaur3

  • 1Department of Biological and Environmental Sciences, College of Arts and Sciences, Qatar University, Doha, Qatar, aouhtit@qu.edu.qa.

Frontiers in Bioscience (Elite Edition)
|March 2, 2020
PubMed

Insights

UVB radiation can trigger skin cell apoptosis, but mutant p16INK4/Rb proteins promote melanoma cell survival. Deregulation of this pathway is an early event in UV-induced skin cancer.

Area of Science:

  • Dermatology
  • Molecular Biology
  • Oncology

Background:

  • The p16INK4/Rb pathway is crucial for cell cycle regulation and apoptosis.
  • UVB radiation is a known carcinogen that can induce DNA damage and skin cancer.
  • Understanding early molecular events in UVB-induced melanomagenesis is vital for developing preventative strategies.

Purpose of the Study:

  • To investigate the role of p16INK4/Rb in normal melanocytes and melanoma cells following UVB exposure.
  • To elucidate the molecular mechanisms underlying early UVB-induced skin damage and melanoma development.

Main Methods:

  • Utilized normal melanocytes and mutant p16-inducible melanoma cell models.
  • Exposed cells to varying doses of UVB radiation.
  • Analyzed protein expression levels of p16INK4, p53, Cdk4, Cdk6, pRb, Bax, and Bcl2.

Main Results:

  • Normal melanocytes express p16INK4 only at high UVB doses, with increased Bax/Bcl2 ratio indicating apoptosis.
  • Wild-type p16INK4 melanoma cells show dose-dependent regulation of p16INK4 and Cdk6.
  • Mutant p16INK4 melanoma cells exhibit increased resistance to apoptosis and cell cycle deregulation, independent of UVB exposure.

Conclusions:

  • Mutant p16INK4 promotes apoptosis resistance and cell cycle deregulation in melanoma cells.
  • Deregulation of the p16INK4/Rb pathway is an early event in UVB-induced melanomagenesis.
  • Findings highlight the critical role of the p16INK4/Rb pathway in skin cancer development.

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