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Updated: Jan 5, 2026
09:50
Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade
Published on: August 14, 2019
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Human CYP1A1 inhibition by flavonoids
Rebeca Santes-Palacios1, Ana L Marroquín-Pérez1, Sandra L Hernández-Ojeda1
1Instituto de Investigaciones Biomédicas, UNAM, Apartado postal 70228, Ciudad de México, México.
Summary
Flavone and its hydroxy derivatives (5-HF, 3-HF) show potent inhibition of Cytochrome P4501A1 (CYP1A1), suggesting their potential as cancer chemoprevention agents against genotoxic environmental compounds.
Area of Science:
- Biochemistry
- Pharmacology
- Toxicology
Background:
- Cytochrome P4501A1 (CYP1A1) metabolizes environmental carcinogens like PAHs.
- CYP1A1 inhibition is a proposed strategy for cancer chemoprevention.
- Flavonoids are plant compounds with potential biological activities.
Purpose of the Study:
- To evaluate the CYP1A1 inhibitory properties of nine flavonoids.
- To investigate the potential of flavonoids as chemopreventive agents against CYP1A1-mediated genotoxicity.
Main Methods:
- Tested inhibitory effects of flavonoids on human recombinant CYP1A1 using EROD activity.
- Performed biochemical characterization and in silico studies for interaction analysis.
- Assessed mutagenicity using the Ames test with human S9 fraction.
Main Results:
- 5-hydroxyflavone (5-HF), 3-hydroxyflavone (3-HF), and flavone (F) showed the highest CYP1A1 inhibition (IC50 values 0.07–0.10 μM).
- Inhibition potency decreased with increased hydroxyl groups.
- Flavone and its hydroxy derivatives are mixed-type inhibitors, interacting with CYP1A1 active site residues via π/π stacking.
- No mutagenicity was observed for 5-HF, 3-HF, and F in the Ames test.
Conclusions:
- 5-HF, 3-HF, and F are potent inhibitors of human CYP1A1.
- These flavonoids demonstrate potential as chemopreventive agents against genotoxic damage induced by CYP1A1 activity.
- Flavonoid structure, specifically the number of hydroxyl groups, influences inhibitory potency.
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