FICZ Unit size Cat. code Docs Qty Price
6-Formylindolo[3,2-b]carbazole; AhR Agonist
1 mg

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FICZ (6-Formylindolo[3,2-b]carbazole) is a highly potent ligand of the cytosolic aryl hydrocarbon receptor (AhR) transcription factor.

FICZ synthesis results from the tryptophan amino acid conversion upon UV-dependent photo-oxidation or H2O2-mediated oxidative stress [1,2].
The presence of FICZ-derived metabolites in human urine points FICZ to be an endogenous AhR agonist, but which requires tryptophan obtainment from the diet [3].

InvivoGen's FICZ is of high quality, guaranteed free of bacterial contamination, and has been functionally tested on HepG2-Lucia™ AhR and HT29-Lucia™ AhR  reporter cells.

Other AhR ligands, as well as an AhR antagonist are also available.


 Learn more on AhR. Read our review on AhR's key role in the intestinal microbiota and immunity.



1. Rannug A. et al., 1987. Certain photooxidized derivatives of tryptophan bind with very high affinity to the Ah receptor and are likely to be endogenous signal substances. J. Biol. Chem. 262:15422-27.
2. Smirnova A. et al., 2018. Evidence for new light-independent pathways for generation of the endogenous aryl hydorcarbon receptor agonist FICZ. Chem. Res. Toxicol. 29:75-86.
3. Wincent E. et al., 2009. The suggested physiologic aryl hydrocarbon receptor activator and cytochrome P4501 substrate 6-formylindolo[3,2-b]carbazole is present in humans. J. Biol. Chem. 284:2690-96.



Evaluation of cellular AhR activation by FICZ
Evaluation of cellular AhR activation by FICZ

FICZ induces a dose-dependent response in HepG2-Lucia™ Ahr and HT29-Lucia™ Ahr cells.
The cells were incubated with increasing concentrations of ITE. After overnight incubation, the AhR activation
was assessed by determining Lucia luciferase activity in the supernatant using QUANTI-Luc™.
Data are expressed as fold responses, as compared to non-induced cells.

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CAS number: 172922-91-7

Synomym: 6-Formylindolo[3,2-b]carbazole

Solubility: 10 mg/ml (37.17 mM) in DMSO

Working concentration: 50 ng/ml (0.18 µM) to 5 μg/ml (18 μM) for cell culture assays

Formula: C19H12N2O

Molecular weight: 284.31 g/mol

Quality control:

  • Purity ≥ 95% (UHPLC).
  • The absence of bacterial contamination (e.g. lipoproteins and endotoxins) has been confirmed using HEK-Blue™ TLR2 and HEK‑Blue™ TLR4 cells.
  • The biological activity has been validated using cellular assays.
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  • 1 mg FICZ

FICZ is shipped at room temperature.

Store at -20°C.


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FICZ chemical structure

FICZ chemical structure

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