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

Deepak Mittal, Fabiana Saccheri, Emilie Vénéreau, Tobias Pusterla, Marco E. Bianchi, Maria Rescigno

Research output: Contribution to journalArticlepeer-review

Abstract

Skin cancers are the most commonly diagnosed cancers. Understanding what are the factors contributing to skin tumour development can be instrumental to identify preventive therapies. The myeloid differentiation primary response gene (MyD)88, the downstream adaptor protein of most Toll-like receptors (TLR), has been shown to be involved in several mouse tumourigenesis models. We show here that TLR4, but not TLR2 or TLR9, is upstream of MyD88 in skin tumourigenesis. TLR4 triggering is not dependent on lipopolysaccharide associated to skin-colonizing bacteria, but on the high mobility group box-1 protein (HMGB1), an endogenous ligand of TLR4. HMGB1 is released by necrotic keratinocytes and is required for the recruitment of inflammatory cells and for the initiation of inflammation. The expression of TLR4 on both bone marrow-derived and radioresistant cells is necessary for carcinogenesis. Consistently, a human tissue microarray analysis showed that melanoma and colon cancer display an over-expression of TLR4 and its downstream adaptor protein MyD88 within tumours. Together, our results suggest that the initial release of HMGB1 triggers a TLR4-dependent inflammatory response that leads to tumour development.

Original languageEnglish
Pages (from-to)2242-2252
Number of pages11
JournalEMBO Journal
Volume29
Issue number13
DOIs
Publication statusPublished - Jul 7 2010

Keywords

  • HMGB1
  • inflammation
  • skin
  • TLR4
  • tumourigenesis

ASJC Scopus subject areas

  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Neuroscience(all)

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