Abstract
The dioxin receptor, also known as arylhydrocarbon receptor (AhR), is a ligand-activated transcription factor that mediates the toxicity of dioxins and related environmental contaminants. In addition, there is a growing list of natural compounds, mainly plant polyphenols that can modulate AhR function and downstream signaling with quite unknown consequences for cellular function. We investigate the potential of four different β-carboline alkaloids to stimulate AhR signaling in human hepatoma cells and keratinocytes. Three test substances, namely rutaecarpine, annomontine and xestomanzamine A, increase AhR-driven reporter gene activity as well as expression of two AhR target genes in a dose-dependent and time-dependent manner. Additionally, the three test alkaloids stimulate cytochrome P450 (CYP) 1 enzyme activity without showing any antagonistic effects regarding benzo(a)pyrene-stimulated CYP1 activation. The AhR-activating property of the β-carbolines is completely abrogated in AhR-deficient cells providing evidence that rutaecarpine, annomontine and xestomanzamine A are natural stimulators of the human AhR. The toxicological relevance of beta-carboline-mediated AhR activation is discussed.
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Abbreviations
- AhR:
-
Arylhydrocarbon receptor
- AhRR:
-
Arylhydrocarbon receptor repressor
- ARNT:
-
Arylhydrocarbon receptor nuclear translocator
- BaP:
-
Benzo(a)pyrene
- bHLH-PAS:
-
Basic Helix-Loop-Helix Per/ARNT/Sim
- CYP:
-
Cytochrome P450
- EGCG:
-
Epigallocatechine-3-gallate
- EROD:
-
Ethoxyresorufin-O-deethylase
- FICZ:
-
6-Formylindolo[3,2-b]carbazole
- HSP90:
-
Heat-shock protein 90
- MNF:
-
3′-Methoxy-4′-nitroflavone
- 3MC:
-
3-Methylcholanthrene
- PKC:
-
Protein kinase C
- TCDD:
-
2,3,7,8-Tetrachlorodibenzo-p-dioxin
- UV:
-
Ultraviolet
- XRE:
-
Xenobiotic responsive element
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Acknowledgments
We are grateful to Katarina Gradin and Lorenz Poellinger (Karolinska Institutet, Sweden) for generously providing the XRE-HepG2 reporter cells and to Yoshio Inouye (Toho University, Japan) for the kind donation of the pcDNA5-rAhRR plasmid. We thank Birgit Neumann and Ulrike Hübenthal for technical support. This work was supported by the graduate school 1427 of the Deutsche Forschungsgemeinschaft (DFG, Bonn, Germany).
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Haarmann-Stemmann, T., Sendker, J., Götz, C. et al. Regulation of dioxin receptor function by different beta-carboline alkaloids. Arch Toxicol 84, 619–629 (2010). https://doi.org/10.1007/s00204-010-0548-2
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DOI: https://doi.org/10.1007/s00204-010-0548-2