Abstract
Indirubin, a bis-indole obtained from various natural sources, is responsible for the reported antileukemia activity of a Chinese Medicinal recipe, Danggui Longhui Wan. However, its molecular mechanism of action is still not well understood. In addition to inhibition of cyclin-dependent kinases and glycogen synthase kinase-3, indirubins have been reported to activate the aryl hydrocarbon receptor (AhR), a cotranscriptional factor. Here, we confirm the interaction of AhR and indirubin using a series of indirubin derivatives and show that their binding modes to AhR and to protein kinases are unrelated. As reported for other AhR ligands, binding of indirubins to AhR leads to its nuclear translocation. Furthermore, the apparent survival of AhR−/− and +/+ cells, as measured by the MTT assay, is equally sensitive to the kinase-inhibiting indirubins. Thus, the cytotoxic effects of indirubins are AhR-independent and more likely to be linked to protein kinase inhibition. In contrast, a dramatic cytostatic effect, as measured by actual cell counts and associated with a sharp G1 phase arrest, is induced by 1-methyl-indirubins, a subfamily of AhR-active but kinase-inactive indirubins. As shown for TCDD (dioxin), this effect appears to be mediated through the AhR-dependent expression of p27KIP1. Altogether these results suggest that AhR activation, rather than kinase inhibition, is responsible for the cytostatic effects of some indirubins. In contrast, kinase inhibition, rather than AhR activation, represents the main mechanism underlying the cytotoxic properties of this class of promising antitumor molecules.
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Abbreviations
- AhR:
-
aryl hydrocarbon receptor
- ARNT:
-
aryl hydrocarbon receptor nuclear translocator
- bHLH/PAS:
-
basic helix–loop–helix/period-aryl hydrocarbon receptor nuclear translocator-single minded
- BIO:
-
6-bromo-indirubin-3′-oxime
- BSA:
-
bovine serum albumin
- CDK:
-
cyclin-dependent kinase
- DAPI:
-
diaminophenylindole, dihydrochloride
- DTT:
-
dithiothreitol
- EGFP:
-
enhanced green fluorescent protein
- FCS:
-
fetal calf serum
- FICZ:
-
6-formylindolo[3,2-b]carbazole
- GSK-3:
-
glycogen synthase kinase -3
- IO:
-
indirubin-3′-oxime
- MeBIO:
-
1-methyl-6-bromo-indirubin-3′-oxime
- MeIO:
-
1-methyl-indirubin-3′-oxime
- MTT:
-
(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium-bromide
- TCDD:
-
2,3,7,8-tetrachlorodibenzo-p-dioxin
- XRE:
-
xenobiotic-responsive element
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Acknowledgements
We are most thankful to our colleagues for providing reagents: Dr Gerhard Eisenbrand (compounds 3, 5, 6, 7, 8, 9, 19, 21, 22), Dr Martin Göttlicher (5L and BP8 cell lines), Dr Charles A Miller III (AhR agonists reporter yeast strain), and Dr Steve Safe (TCDD). This research was also supported by grants from the ‘Association pour la Recherche sur le Cancer’ ARC5732 (LM), ARC5812 (MB) and ARC5664 (MF), the National Institutes of Environmental Health Sciences NIH5P42ES04699 (MD) and by a grant (‘Molécules & Cibles Thérapeutiques’) from the ‘Ministère de la Recherche/INSERM/CNRS’ (LM).
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Knockaert, M., Blondel, M., Bach, S. et al. Independent actions on cyclin-dependent kinases and aryl hydrocarbon receptor mediate the antiproliferative effects of indirubins. Oncogene 23, 4400–4412 (2004). https://doi.org/10.1038/sj.onc.1207535
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DOI: https://doi.org/10.1038/sj.onc.1207535
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