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Updated: May 30, 2026

Chemical-Induced Skin Carcinogenesis Model Using Dimethylbenz[a]Anthracene and 12-O-Tetradecanoyl Phorbol-13-Acetate (DMBA-TPA)
04:12

Chemical-Induced Skin Carcinogenesis Model Using Dimethylbenz[a]Anthracene and 12-O-Tetradecanoyl Phorbol-13-Acetate (DMBA-TPA)

Published on: December 19, 2019

Chk1 is essential for chemical carcinogen-induced mouse skin tumorigenesis

L M Tho1, S Libertini, R Rampling

  • 1Beatson Institute for Cancer Research, Bearsden, Glasgow, UK.

Oncogene
|August 2, 2011
PubMed

Insights

Complete loss of Chk1 suppresses tumor formation in mouse skin, while partial loss promotes malignant progression. This highlights Chk1

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Genetics

Background:

  • Checkpoint kinase 1 (Chk1) is crucial for DNA damage response and maintaining genome stability in eukaryotes.
  • Understanding Chk1's role in checkpoint proficiency is vital for cancer development insights.
  • Investigating Chk1's function in mouse skin tumorigenesis induced by chemical carcinogens.

Purpose of the Study:

  • To determine the impact of complete Chk1 gene ablation on chemically induced skin tumors.
  • To assess the effect of Chk1 haploinsufficiency on benign tumor progression to carcinoma.

Main Methods:

  • Genetic ablation of Chk1 in mouse skin prior to carcinogen exposure.
  • Analysis of tumor formation, cell proliferation, apoptosis, and DNA damage markers (γ-H2AX).
  • Evaluation of Chk1 expression in developing tumors and assessment of tumor progression in hemizygous models.

Main Results:

  • Complete Chk1 deletion significantly suppressed benign tumor (papilloma) formation.
  • Tumors in Chk1-ablated skin retained Chk1 expression; deletion induced transient proliferation, apoptosis, and γ-H2AX staining.
  • Papillomas in Chk1 hemizygous skin showed increased progression to carcinoma.

Conclusions:

  • Complete loss of Chk1 function is incompatible with epithelial tumorigenesis initiation.
  • Partial loss of Chk1 function (haploinsufficiency) promotes the progression of benign tumors to malignant carcinomas.
  • Chk1 plays a dual role in cancer development, suppressing initiation but fostering progression upon partial loss.

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