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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

TLR4-mediated skin carcinogenesis is dependent on immune and radioresistant cells

Deepak Mittal1, Fabiana Saccheri, Emilie Vénéreau

  • 1Department of Experimental Oncology, European Institute of Oncology, Milano, Italy.

The EMBO Journal
|June 8, 2010
PubMed

Insights

High mobility group box-1 protein (HMGB1) triggers Toll-like receptor 4 (TLR4)-dependent inflammation, driving skin tumor development. This pathway involves myeloid differentiation primary response gene (MyD)88 and is crucial for skin carcinogenesis.

Area of Science:

  • Oncology
  • Immunology
  • Dermatology

Background:

  • Skin cancers are the most common cancers globally.
  • Understanding skin tumor development factors is key for preventive therapies.
  • Myeloid differentiation primary response gene (MyD)88 is implicated in various tumor models.

Purpose of the Study:

  • To investigate the role of Toll-like receptors (TLRs) and MyD88 in skin carcinogenesis.
  • To identify the specific TLRs and initiating factors involved in skin tumor development.

Main Methods:

  • Utilized mouse models to study skin tumor development.
  • Investigated the upstream regulators of MyD88 in skin carcinogenesis.
  • Analyzed human tissue microarrays of melanoma and colon cancer.

Main Results:

  • Toll-like receptor 4 (TLR4), not TLR2 or TLR9, is upstream of MyD88 in skin tumor development.
  • TLR4 activation is mediated by high mobility group box-1 protein (HMGB1), released by necrotic keratinocytes, not bacterial lipopolysaccharide.
  • HMGB1 initiates inflammation by recruiting inflammatory cells.
  • TLR4 expression on both bone marrow-derived and radioresistant cells is essential for carcinogenesis.
  • Human melanoma and colon cancer tissues overexpress TLR4 and MyD88.

Conclusions:

  • The release of HMGB1 by damaged cells initiates a TLR4-dependent inflammatory cascade.
  • This inflammatory response is a critical driver of skin tumor development.
  • Targeting the HMGB1-TLR4-MyD88 axis may offer novel therapeutic strategies for skin cancer prevention.

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