TCDD induces c-jun expression via a novel Ah (dioxin) receptor-mediated p38-MAPK-dependent pathway

Carsten Weiss, Dagmar Faust, Heike Dürk, Siva Kumar Kolluri, Anke Pelzer, Sandra Schneider, Cornelia Dietrich, Franz Oesch, Martin Göttlicher

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

The aryl hydrocarbon receptor (AhR) has a fundamental role during postnatal liver development and is essential for mediating dioxin toxicity. However, the genetic programs mediating, both, the toxic and physiological effects downstream of the transcription factor AhR are in major parts unknown. We have identified the proto-oncogene c-jun as a novel target gene of AhR. Induction of c-jun depends on activation of p38-mitogen-activated protein kinase (MAPK) by an AhR-dependent mechanism. None of the kinases that are known to phosphorylate p38-MAPK is activated by AhR. Neither the dephosphorylation rate of p38-MAPK is reduced. Furthermore, increased p38-MAPK phosphorylation in response to dioxins does not require ongoing transcription. These findings establish activating 'cross-talk' with MAPK signaling as a novel principle of AhR action, which is apparently independent of the AhR's function as a DNA-binding transcriptional activator.

Original languageEnglish
Pages (from-to)4975-4983
Number of pages9
JournalOncogene
Volume24
Issue number31
DOIs
StatePublished - 21 Jul 2005
Externally publishedYes

Keywords

  • Ah receptor
  • Cross-talk
  • Dioxin
  • TCDD
  • c-jun
  • p38 MAP kinase

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